WO2024198460A1 - 电子设备和电子设备的装配方法 - Google Patents

电子设备和电子设备的装配方法 Download PDF

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Publication number
WO2024198460A1
WO2024198460A1 PCT/CN2023/135719 CN2023135719W WO2024198460A1 WO 2024198460 A1 WO2024198460 A1 WO 2024198460A1 CN 2023135719 W CN2023135719 W CN 2023135719W WO 2024198460 A1 WO2024198460 A1 WO 2024198460A1
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WO
WIPO (PCT)
Prior art keywords
electronic device
back cover
curable
middle frame
tape
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/135719
Other languages
English (en)
French (fr)
Inventor
张鸿鸣
臧永强
霍国亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honor Device Co Ltd
Original Assignee
Honor Device Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honor Device Co Ltd filed Critical Honor Device Co Ltd
Priority to US18/864,741 priority Critical patent/US20250341866A1/en
Priority to EP23930026.2A priority patent/EP4503873A4/en
Publication of WO2024198460A1 publication Critical patent/WO2024198460A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/30Adhesives in the form of films or foils characterised by the adhesive composition
    • GPHYSICS
    • G06COMPUTING OR CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16Constructional details or arrangements
    • G06F1/1613Constructional details or arrangements for portable computers
    • G06F1/1633Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1656Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/02Constructional features of telephone sets
    • H04M1/0202Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026Details of the structure or mounting of specific components
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/12Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04Homopolymers or copolymers of esters
    • C09J133/06Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/062Copolymers with monomers not covered by C09J133/06
    • C09J133/066Copolymers with monomers not covered by C09J133/06 containing -OH groups
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J163/00Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/133308Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133314Back frames
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/133308Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133317Intermediate frames, e.g. between backlight housing and front frame
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/133308Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133325Assembling processes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/02Constructional features of telephone sets
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80Constructional details
    • H10K59/87Passivation; Containers; Encapsulations
    • H10K59/871Self-supporting sealing arrangements
    • H10K59/8722Peripheral sealing arrangements, e.g. adhesives, sealants
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2203/00Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/326Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00Additional features of adhesives in the form of films or foils
    • C09J2301/40Additional features of adhesives in the form of films or foils characterized by the presence of essential components
    • C09J2301/416Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2433/00Presence of (meth)acrylic polymer
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2463/00Presence of epoxy resin
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B11/00Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
    • F16B11/006Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00Materials and properties
    • G02F2202/28Adhesive materials or arrangements

Definitions

  • the embodiments of the present application relate to the technical field of electronic products, and in particular, to an electronic device and an assembly method of the electronic device.
  • the middle frame and the back cover are usually bonded and fixed by at least one of the bonding structures of pressure-sensitive tape and hot-melt adhesive.
  • the assembly is convenient, the production efficiency is high and the processing cost is low.
  • the bonding strength of the pressure-sensitive tape is weak, so that the connection reliability between the back cover and the middle frame is poor.
  • the middle frame and the back cover are bonded by hot-melt adhesive or hot-melt adhesive combined with pressure-sensitive tape, the connection reliability between the back cover and the middle frame can be improved.
  • the hot-melt adhesive needs to be set on the back cover and/or the middle frame through a dispensing process, and the assembly process is complicated and the processing cost is high. Therefore, how to reduce the difficulty of assembling electronic equipment while improving the connection reliability between the back cover and the middle frame is a technical problem that needs to be solved urgently.
  • the embodiments of the present application provide an electronic device and an assembly method of the electronic device, which can improve the connection reliability between the back cover and the middle frame while reducing the difficulty of assembling the electronic device.
  • the present application provides an electronic device, comprising a middle frame, a back cover and a UV-curing tape layer, the back cover being arranged on one side of the middle frame, the back cover comprising a substrate and an ink layer, the ink layer being arranged on a surface of the substrate facing the middle frame; the back cover and the middle frame are bonded and fixed by the UV-curing tape layer, the UV-curing tape layer is connected between the ink layer and the middle frame, the shear strength between the UV-curing tape layer and the ink layer is greater than or equal to 1.5 MPa, and the shear strength between the UV-curing tape layer and the middle frame is greater than or equal to 1.5 MPa.
  • the back cover and the middle frame are bonded and fixed by the UV curing tape layer.
  • the UV curing tape layer and the UV curing tape are easier to clean than the pressure sensitive tape and the hot melt adhesive, and there will be no residue, which can improve the rework yield.
  • the electronic device in the present application by setting the shear strength between the UV curing tape layer and the ink layer of the back cover to be greater than or equal to 1.5Mpa, and the shear strength between the UV curing tape layer and the middle frame to be greater than or equal to 1.5Mpa, can ensure the bonding strength between the UV curing tape layer and the ink layer and the middle frame, thereby ensuring the bonding strength between the back cover and the middle frame, so as to improve the connection reliability between the back cover and the middle frame, and reduce the risk of separation between the back cover and the middle frame in the scene where the electronic device falls or is hit.
  • the electronic device in the present application can simplify the assembly process between the back cover and the middle frame on the basis of improving the connection reliability between the back cover and the middle frame, reduce the difficulty of assembling the back cover and the middle frame, and thus reduce the processing cost of the electronic device.
  • the shear strength between the UV-curable adhesive tape layer and the ink layer is The degree is less than or equal to 7MPa. That is, the shear strength between the UV-curing tape layer and the back cover is in the range of 1.5MPa to 7MPa. In this way, the bonding strength and impact resistance between the UV-curing tape layer and the ink layer can be moderate.
  • the connection reliability between the back cover and the middle frame can be ensured, and the risk of separation of the back cover and the middle frame when the electronic device falls or is hit can be effectively reduced; on the other hand, when the electronic device falls or the back cover is removed during the repair of the electronic device, the UV-curing tape layer can be prevented from pulling off the ink layer on the back cover, thereby effectively reducing the risk of the ink layer falling off, which is beneficial to extend the service life of the electronic device.
  • the shear strength between the UV-curing tape layer and the middle frame is less than or equal to 7MPa. That is, the shear strength between the UV-curing tape layer and the middle frame ranges from 1.5MPa to 7MPa. In this way, on the one hand, the difficulty of disassembly between the back cover and the middle frame can be reduced, and during the rework of the electronic device, it is convenient to remove the back cover from the middle frame, which is beneficial to improve the rework efficiency and shorten the rework time.
  • the difference between the shear strength between the UV-curing tape layer and the back cover and the shear strength between the UV-curing tape layer and the middle frame can be reduced, so that the bonding strength between the UV-curing tape layer and the back cover and the middle frame can be roughly balanced, thereby improving the force uniformity of the UV-curing tape layer, which is beneficial to improving the overall structural stability of the electronic device.
  • the width of at least part of the UV-curable tape layer is less than 0.8 mm. Furthermore, the width of the UV-curable tape layer is less than or equal to 0.5 mm. In this way, it is helpful to reduce the bonding area between the back cover and the middle frame, thereby increasing the assembly space of components such as batteries and circuit boards without increasing the overall volume of the electronic device, which is helpful to increase the volume of components such as batteries and circuit boards, thereby improving the endurance of electronic devices, and is helpful to expand the functions of electronic devices and optimize the performance of electronic devices. In addition, it is also helpful to reduce the volume of electronic devices and realize the lightweight design of electronic devices.
  • the width of at least part of the UV-curable tape layer is greater than or equal to 0.25 mm.
  • the width w of the UV-curable tape layer may be 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc. In this way, the bonding strength between the back cover and the middle frame can be ensured.
  • the width of at least part of the UV-curable tape layer is greater than or equal to 0.25 mm and less than or equal to 0.5 mm.
  • the thickness of the UV-curable tape layer is greater than or equal to 0.15 mm and less than or equal to 0.45 mm.
  • it is convenient to light-activate the UV-curable tape by UV light, which can ensure the connection strength between the back cover and the middle frame and improve the drop resistance of the electronic device; on the other hand, it can reduce the size of the middle frame, the UV-curable tape layer, and the back cover in the thickness direction of the electronic device (that is, the Z-axis direction); on the other hand, it can effectively absorb the manufacturing flatness problem of the back cover and the middle frame, and can improve the assembly yield between the back cover and the middle frame.
  • the UV-curable tape layer is formed by a UV-curable tape subjected to a light-curing treatment
  • the UV-curable tape comprises: a substrate, a first adhesive film, and a second adhesive film, wherein the substrate is a transparent member, and the substrate comprises a first surface and a second surface opposite to each other, and the first surface faces the back cover; the first adhesive film is disposed on the first surface of the substrate, and the second adhesive film is disposed on the second surface of the substrate.
  • the first adhesive film is provided on the first surface of the substrate, and is used to be bonded and fixed to the back cover; the second adhesive film is provided on the second surface of the substrate, and is used to be bonded and fixed to the middle frame, and both the first adhesive film and the second adhesive film include an ultraviolet curing composition.
  • the structure of the ultraviolet curing tape in this embodiment is simple, and the processing is convenient.
  • the ultraviolet curing composition in the first adhesive film and the ultraviolet curing composition in the second adhesive film can be adjusted according to the material of the middle frame and the back cover, so that the shear strength between the cured first adhesive film and the ink layer of the back cover and the shear strength between the cured second adhesive film and the middle frame are moderate.
  • the ultraviolet light curing composition in the first adhesive film is the same as the ultraviolet light curing composition in the second adhesive film.
  • the transmittance of the substrate is greater than or equal to 92%.
  • the UV-curing tape when the UV-curing tape is set on the back cover, the second adhesive film can be exposed, the UV light can directly activate the second adhesive film, and the UV light can activate the first adhesive film through the substrate.
  • the UV-curing tape when the UV-curing tape is set on the middle frame, the first adhesive film can be exposed, the UV light can directly activate the first adhesive film, and the UV light can activate the second adhesive film 633 through the substrate.
  • the substrate is a transparent plastic part.
  • the material of the substrate may include at least one of polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), and polycarbonate (PC).
  • PET polyethylene terephthalate
  • PMMA polymethyl methacrylate
  • PC polycarbonate
  • Transparent plastic parts have good light transmittance, are inexpensive, and are easily available.
  • the UV-curable tape layer is formed by UV-curable tape being subjected to a light-curing treatment
  • the UV-curable tape comprises: a first adhesive film, the first adhesive film comprises a UV-curable composition, the first adhesive film comprises a first adhesive surface and a second adhesive surface facing each other, the first adhesive surface is used for bonding to the back cover, and the second adhesive surface is used for bonding to the middle frame.
  • the bonding and fixing between the middle frame and the back cover can also be achieved, and the UV-curable tape has a simple structure and is easy to process.
  • the UV-curable composition includes an acrylic polymer, a curable component and a photobase initiator, the monomer of the acrylic polymer includes an acryl monomer containing a hydroxyl functional group; the curable component includes a multifunctional thiol and a multifunctional epoxy resin.
  • the hydroxyl functional group has good wettability with the material of the ink layer.
  • the monomer of the acrylic polymer includes an acryl monomer containing a hydroxyl functional group, the wettability between the UV-curable composition and the ink layer can be improved, thereby improving the shear strength between the UV-curable tape layer and the back cover, so that the UV-curable tape layer is not only suitable for bonding interfaces of metals, PC, PMMA, etc., but also suitable for bonding interfaces including ink layers, so that the UV-curable tape layer can be suitable for bonding interfaces of a variety of different materials.
  • the ratio of the mass of the acrylic polymer to the mass of the UV-curable composition is greater than or equal to 60%. That is, in the UV-curable tape layer, the mass fraction of the acrylic polymer is greater than or equal to 60%.
  • the shear strength between the UV-curable tape layer and the back cover can be controlled to be between 1.5MPa and 7MPa, and the bonding strength between the UV-curable tape layer and the ink layer can be significantly improved.
  • the UV-curable tape layer can be prevented from pulling off the ink layer on the back cover when the electronic device falls or the back cover is removed during the repair of the electronic device, thereby effectively reducing the risk of the ink layer falling off, which is beneficial to extending the service life of the electronic device; on the other hand, the initial viscosity of the UV-curable tape can be significantly improved, thereby improving the positioning performance of the UV-curable tape layer.
  • the middle frame includes a middle plate and a frame, the frame is connected to the outer edge of the middle plate, and the UV curable tape layer is connected between the middle plate and the back cover.
  • a specific connection method is provided.
  • the frame is formed on the edge of the middle plate by an injection molding process, so that the connection strength between the frame and the middle plate can be improved and the processing cost of the middle frame can be reduced.
  • the middle plate is a metal piece, an acrylic piece, or a polycarbonate piece. In this way, the structural strength of the middle frame can be ensured, and the middle frame and the back cover can be bonded and fixed by the UV-curable tape layer.
  • the electronic device further includes a screen, and the screen is disposed on a side of the middle frame away from the back cover.
  • the initial adhesion between the UV-curable tape and the back cover is greater than or equal to 0.2 N/mm. In this way, the bonding strength between the UV-curable tape that has not been photocured and the back cover can be ensured, the UV-curable tape that has not been photocured can be prevented from slipping off the back cover, and the positioning reliability between the UV-curable tape that has not been photocured and the back cover can be improved, thereby reducing the difficulty of assembling the back cover and the middle frame and improving the assembly yield of the electronic device.
  • the initial adhesion between the UV-curable tape and the back cover is less than or equal to 1 N/mm. In this way, the processing difficulty and cost of the UV-curable tape can be reduced, thereby reducing the overall cost of the electronic device.
  • the initial adhesion between the UV-curable tape and the middle frame is greater than or equal to 0.2 N/mm.
  • the initial adhesion between the UV-curable tape and the middle frame is less than or equal to 1 N/mm.
  • the die-cuttable width of the UV-curable tape is less than 0.8 mm. Furthermore, the die-cuttable width of the UV-curable tape is less than or equal to 0.5 mm. Among them, the die-cuttable width of the UV-curable tape refers to the die-cutting width of the UV-curable tape when the UV-curable tape is not subjected to photocuring treatment. In this way, in practical applications, the UV-curable tape can be die-cut according to actual needs, and the UV-curable tape can be die-cut to the required width.
  • the die-cuttable width of the UV-curable tape is small, it can meet the different width requirements of the UV-curable tape layer at different bonding locations, which can make the bonding between the middle frame and the back cover more flexible, facilitate the assembly of internal components of the electronic device, and help to increase the assembly space of components such as batteries and circuit boards of the electronic device.
  • the present application provides an assembly method of an electronic device, comprising: providing a first structural member, the first structural member comprising a first bonding area; setting an uncured UV-curing tape on the first bonding area of the first structural member; irradiating the first bonding area provided with the UV-curing tape with UV light to activate the UV-curing tape; providing a second structural member, the second structural member comprising a second bonding area, setting the second structural member on one side of the first structural member, and connecting the UV-curing tape between the first bonding area and the second bonding area to form a first blank; performing a pressure-maintaining treatment on the first blank for a preset time, so that the UV-curing tape forms a UV-curing tape layer; wherein the first structural member comprises a back cover, and the second structural member comprises a middle frame, the first bonding area is located on the ink layer of the back cover, and the second bonding area is located on the middle frame; or the first structural member comprises a middle
  • the electronic device assembly method of the present application only requires the uncured UV curing adhesive to be
  • the tape is light-activated, and the first structural member and the second structural member are pressed together to achieve assembly between the first structural member and the second structural member.
  • the process is simple, the processing efficiency is high, and the cost is low.
  • a UV-curing tape layer is formed, which can ensure the connection strength between the first structural member and the second structural member, thereby ensuring the bonding strength between the back cover and the middle frame, so as to improve the connection reliability between the back cover and the middle frame, and reduce the risk of separation between the back cover and the middle frame in the scenario where the electronic device falls or is hit.
  • the UV-curing tape layer and the UV-curing tape are easier to clean and will not leave residue, which can improve the repair yield of electronic equipment.
  • the preset time length for performing the pressure holding treatment on the first blank includes: performing the pressure holding treatment on the first blank for 60s to 120s using a pressure holding fixture.
  • the processing efficiency is high, which is conducive to reducing the processing cost.
  • the die-cuttable width of the UV-curable tape is less than 0.8 mm. Furthermore, the die-cuttable width of the UV-curable tape is less than or equal to 0.5 mm. Among them, the die-cuttable width of the UV-curable tape refers to the die-cutting width of the UV-curable tape when the UV-curable tape is not subjected to photocuring treatment. In this way, in practical applications, the UV-curable tape can be die-cut according to actual needs, and the UV-curable tape can be die-cut to the required width.
  • the die-cuttable width of the UV-curable tape is small, it can meet the different width requirements of the UV-curable tape layer at different bonding locations, which can make the bonding between the middle frame and the back cover more flexible, facilitate the assembly of internal components of the electronic device, and help to increase the assembly space of components such as batteries and circuit boards of the electronic device.
  • the initial adhesion between the UV-curing tape and the first bonding area is greater than or equal to 0.2N/mm. Specifically, when the first bonding area is located on the ink layer, the initial adhesion between the UV-curing tape and the ink layer is greater than or equal to 0.2N/mm. When the first bonding area is located on the middle frame, the initial adhesion between the UV-curing tape and the middle frame is greater than or equal to 0.2N/mm.
  • the bonding strength between the uncured UV-curing tape and the first bonding area can be ensured, the uncured UV-curing tape can be prevented from slipping off the first bonding area, the positioning reliability between the uncured UV-curing tape and the first structural member can be improved, and the difficulty of assembling the electronic device can be reduced, which is conducive to improving the assembly yield of the electronic device.
  • the UV-curing tape includes: a substrate, a first adhesive film and a second adhesive film, the substrate is a transparent member, the substrate includes a first surface and a second surface relative to each other, the first surface faces the back cover; the first adhesive film is arranged on the first surface of the substrate, and the first adhesive film is used to be bonded and fixed to the back cover; the second adhesive film is arranged on the second surface of the substrate, and the second adhesive film is used to be bonded and fixed to the middle frame, and the first adhesive film and the second adhesive film both include a UV-curing composition.
  • the UV-curing tape includes: a first adhesive film, the first adhesive film includes a UV-curing composition, the first adhesive film includes a first adhesive surface and a second adhesive surface opposite to each other, the first adhesive surface is used to bond to the back cover, and the second adhesive surface is used to bond to the middle frame.
  • the UV-curable composition includes an acrylic polymer, a curable component and a photobase initiator, the monomer of the acrylic polymer includes an acryl monomer containing a hydroxyl functional group; the curable component includes a multifunctional thiol and a multifunctional epoxy resin.
  • the thickness of the UV-curable adhesive tape is greater than or equal to 0.15 mm and less than or equal to 0.45 mm. In this way, the thickness of the UV-curable adhesive tape layer can be controlled within a range of 0.15 mm to 0.45 mm.
  • FIG1 is a perspective view of an electronic device provided by some embodiments of the present application.
  • FIG2 is an exploded view of the electronic device shown in FIG1 ;
  • FIG3 is a cross-sectional view of the electronic device shown in FIG1 taken along line A-A;
  • FIG4 is a partial cross-sectional schematic diagram of a back cover provided in some embodiments of the present application.
  • FIG5 is a schematic diagram of assembling a back cover and an adhesive structure provided in some embodiments of the present application.
  • FIG6 is a schematic diagram of assembling a back cover and an adhesive structure provided in other embodiments of the present application.
  • FIG7 is a cross-sectional view of an electronic device provided in some other embodiments of the present application.
  • FIG8 is a schematic diagram of a laminated structure of a UV-curable adhesive tape provided in some embodiments of the present application.
  • FIG9 is a schematic diagram of the structure of UV-curable tapes provided in other embodiments of the present application.
  • FIG10 is a flow chart of an assembly method of an electronic device provided in some embodiments of the present application.
  • FIG11 is a schematic diagram of a flow chart of an assembly method of an electronic device provided in some embodiments of the present application.
  • FIG. 12 is an enlarged view of the region A in the flow diagram shown in FIG. 11 .
  • the terms "exemplary” or “for example” are used to indicate examples, illustrations or descriptions. Any embodiment or design described as “exemplary” or “for example” in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as “exemplary” or “for example” is intended to present related concepts in a specific way.
  • first and second are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features.
  • the term "at least one” refers to one or more, and “plurality” refers to two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items.
  • at least one of a, b, or c can be represented by: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.
  • connection can be detachably connected or non-detachably connected; it can be directly connected or indirectly connected through an intermediate medium.
  • fixed connection It means that the two parts are connected to each other and the relative position relationship after the connection remains unchanged.
  • Rotation connection means that the two parts are connected to each other and can rotate relative to each other after the connection.
  • Slide connection means that the two parts are connected to each other and can slide relative to each other after the connection.
  • the present application provides an electronic device.
  • the electronic device includes but is not limited to mobile phones, tablet computers (tablet personal computers), laptop computers (laptop computers), personal digital assistants (PDAs), personal computers, notebook computers, vehicle-mounted devices, wearable devices, and the like.
  • wearable devices include but are not limited to watches, bracelets, and the like.
  • Figure 1 is a three-dimensional diagram of an electronic device 100 provided in some embodiments of the present application
  • Figure 2 is an exploded diagram of the electronic device 100 shown in Figure 1.
  • the electronic device 100 in this embodiment is described by taking a tablet phone as an example. It can be understood that in other embodiments, the electronic device 100 can also be a foldable phone.
  • the electronic device 100 includes a screen 10, a middle frame 20, a circuit board 30 (not shown in Figure 1), a battery 40 (not shown in Figure 1) and a back cover 50 (also referred to as a battery cover).
  • FIG. 1 and FIG. 2 and the following related figures only schematically illustrate some components included in the electronic device 100, and the actual shape, actual size, actual position and actual structure of these components are not limited by FIG. 1 and FIG. 2 and the following figures.
  • the electronic device 100 when the electronic device 100 is a device of some other form, the electronic device 100 may not include the screen 10.
  • the electronic device 100 is in the shape of a rectangular flat plate.
  • an XYZ coordinate system is established.
  • the width direction of the electronic device 100 is defined as the X-axis direction
  • the length direction of the electronic device 100 is defined as the Y-axis direction
  • the thickness direction of the electronic device 100 is defined as the Z-axis direction.
  • the coordinate system setting of the electronic device 100 can be flexibly set according to actual needs, and is not specifically limited here.
  • the shape of the electronic device 100 can also be a square flat plate, a circular flat plate, an elliptical flat plate, etc.
  • the screen 10 is used to display images, videos, etc.
  • the screen 10 includes a light-transmitting cover plate 11 and a display screen 12.
  • the light-transmitting cover plate 11 and the display screen 12 are stacked.
  • the light-transmitting cover plate 11 is mainly used to protect the display screen 12 and prevent dust.
  • the display screen 12 can be a flexible display screen or a rigid display screen.
  • the display screen 12 can be an organic light-emitting diode (OLED) display screen, a liquid crystal display (LCD), etc.
  • OLED organic light-emitting diode
  • LCD liquid crystal display
  • the middle frame 20 forms a part of the housing of the electronic device 100. That is, the housing of the electronic device 100 includes the middle frame 20.
  • the middle frame 20 is used as a supporting frame of the electronic device 100, and is used to install electronic devices such as the screen 10, the circuit board 30, and the battery 40.
  • FIG. 2 and FIG. 3 which is a cross-sectional view of the electronic device 100 shown in FIG. 1 at line AA.
  • the middle frame 20 includes a frame 21 and a middle plate 22.
  • the frame 21 is annular, and the middle plate 22 is fixed to the inner side of the frame 21.
  • the frame 21 may surround the edge of the middle plate 22.
  • the screen 10 may be fixed to the middle frame 20 by means of the light-transmitting cover plate 11. Specifically, the light-transmitting cover plate 11 may be fixed to the frame 21 or the middle plate 22 of the middle frame 20.
  • the middle plate 22 is a metal part.
  • the middle plate 22 can be made of a metal material with greater structural strength and hardness, so that the middle plate 22 has greater structural strength, so that the middle plate 22 can play a role of stable support.
  • the material of the middle plate 22 can be aluminum alloy, stainless steel, etc.
  • the middle plate 22 can also be a plastic part.
  • the material of the middle plate 22 can be acrylic (polymethyl methacrylate, PMMA), polycarbonate (polycarbonate, PC), etc.
  • the frame 21 can be formed on the edge of the middle plate 22 by injection molding.
  • the frame 21 is a plastic part.
  • the material of the frame 21 can be PMMA, PC, etc. In this way, the connection strength between the frame 21 and the middle plate 22 can be improved, and the processing cost of the middle frame 20 can be reduced.
  • the middle frame 20 may also be an integrally formed part, or the middle plate 22 and the frame 21 may also be fixedly connected by gluing, welding, clamping, etc.
  • the circuit board 30 includes a main circuit board 31 and a sub-circuit board 32.
  • the main circuit board 31 and the sub-circuit board 32 are both fixedly connected to the side surface of the middle plate 22 away from the screen 10, and the main circuit board 31 and the sub-circuit board 32 are spaced apart.
  • the main circuit board 31 and the sub-circuit board 32 are spaced apart in the Y-axis direction.
  • the main circuit board 31 is used to integrate a control chip, which may be, for example, an application processor (AP), a double data rate synchronous dynamic random access memory (DDR), and a universal flash storage (UFS).
  • a control chip which may be, for example, an application processor (AP), a double data rate synchronous dynamic random access memory (DDR), and a universal flash storage (UFS).
  • AP application processor
  • DDR double data rate synchronous dynamic random access memory
  • UFS universal flash storage
  • the auxiliary circuit board 32 is used to integrate the radio frequency front end of the antenna (such as a 5G antenna), the universal serial bus (USB) device, the vibrator and other electronic devices.
  • a socket can be set at the position corresponding to the USB device on the frame 21, and accessories such as a charger, earphones, and a data cable can be electrically connected to the USB device via the socket to achieve power, signal and data transmission.
  • the auxiliary circuit board 32 is electrically connected to the main circuit board 31 to achieve data and signal transmission between the main circuit board 31 and the auxiliary circuit board 32. It can be understood that in other embodiments, the circuit board 30 may also include only the main circuit board 31 without including the auxiliary circuit board 32.
  • the battery 40 is used to provide power to the display screen 12, the circuit board 30, etc.
  • the battery 40 can be fixedly connected to the side surface of the middle plate 22 that is away from the screen 10.
  • the battery 40 can be arranged between the main circuit board 31 and the auxiliary circuit board 32.
  • the side surface of the middle plate 22 that is away from the screen 10 is provided with an assembly groove 221, and the battery 40 can be installed in the assembly groove 221. In this way, it is helpful to reduce the overlapping size of the battery 40 and the middle plate 22 in the Z-axis direction, which is helpful to reduce the overall thickness of the electronic device 100.
  • the back cover 50 forms a part of the shell of the electronic device 100, and is used to protect the main circuit board 31, the auxiliary circuit board 32, the battery 40 and other electronic devices inside the electronic device 100. That is, the shell of the electronic device 100 includes the back cover 50. Please continue to refer to Figures 2 and 3.
  • the back cover 50 is located on the side of the middle plate 22 away from the screen 10, and the back cover 50 is fixed to the middle frame 20.
  • a receiving cavity for accommodating the main circuit board 31, the auxiliary circuit board 32, the battery 40, etc. is enclosed between the back cover 50 and the middle frame 20.
  • the back cover 50 can be a 2D back cover, a 2.5D back cover or a 3D back cover.
  • FIG. 4 is a partial cross-sectional schematic diagram of a back cover 50 provided in some embodiments of the present application.
  • the back cover 50 includes a substrate 51 and an ink layer 52.
  • FIG. 4 and the related figures below only schematically illustrate some of the laminated structures included in the back cover 50, and the actual thickness and actual structure of these laminated structures are not limited by FIG. 4 and the figures below.
  • the laminated structure of the back cover 50 is not limited to the substrate 51 and the ink layer 52.
  • the back cover 50 may also include a substrate 51 disposed away from the ink layer 52. Other film layers on the side surface, and/or other film layers disposed between the substrate 51 and the ink layer 52 .
  • the substrate 51 may be a transparent member.
  • the substrate 51 includes a first inner surface 511 and a first outer surface 512 facing each other.
  • the first inner surface 511 of the substrate 51 faces the middle frame.
  • the substrate 51 may be an acrylic (polymethyl methacrylate, PMMA) board, a polycarbonate (polycarbonate, PC) board, a composite board formed by stacking acrylic boards and polycarbonate boards, glass, etc.
  • the ink layer 52 is disposed on the side facing the first inner surface 511 of the substrate 51.
  • the ink layer 52 can be used to decorate the back cover 50.
  • the ink layer 52 can be an ink layer 52 with a single color or an ink layer 52 with a specific decorative pattern.
  • the substrate 51 is a transparent member
  • the ink layer 52 can be exposed through the substrate 51 on the first outer surface 512 of the substrate 51. In this way, the user can see the ink layer 52 from the outside of the electronic device 100.
  • the appearance of the electronic device 100 can be improved to meet the user's demand for the appearance of the electronic device 100.
  • the user will not touch the ink layer 52 during the use of the electronic device 100, which can prevent the ink layer 52 from being scratched by hard objects, which is beneficial to improving the service life of the back cover 50 and the electronic device 100.
  • the ink layer 52 may include one or more layers.
  • the material of the ink layer 52 may include a main resin.
  • the main resin includes but is not limited to a polyester resin.
  • the ink layer 52 may be formed on the substrate 51 by silk screen printing, transfer printing, etc.
  • the material of the ink layer 52 may also include matte powder.
  • the matte powder may include precipitated silica and bentonite.
  • the electronic device 100 further includes an adhesive structure 60, which is connected between the back cover 50 and the middle frame 20.
  • the adhesive structure 60 is connected between the back cover 50 and the middle plate 22. In this way, the back cover 50 and the middle frame 20 can be bonded by the adhesive structure 60.
  • FIG. 5 is a schematic diagram of the assembly of the back cover 50 and the adhesive structure 60 provided in some embodiments of the present application.
  • the adhesive structure 60 includes a pressure-sensitive adhesive tape 61, which can be adhered to the inner surface of the back cover 50, and the pressure-sensitive adhesive tape 61 can be set at the edge of the inner surface of the back cover 50.
  • the pressure-sensitive adhesive tape 61 can be connected between the ink layer 52 of the back cover 50 and the middle frame 20.
  • the pressure-sensitive tape 61 is a special type of tape, which is made by applying a special adhesive (pressure-sensitive adhesive) to the strip-shaped substrate 51.
  • the pressure-sensitive tape 61 includes but is not limited to foam tape (also referred to as foam pressure-sensitive tape).
  • the pressure-sensitive adhesive tape 61 can be directly bonded to the back cover 50 or the middle frame 20 after die-cutting, and then the back cover 50 and the middle frame 20 are assembled together by a positioning jig.
  • the bonding of the back cover 50 and the middle frame 20 can be achieved by applying a small pressure, and it does not require a long time or high-temperature curing at a temperature greater than 160°C, which is convenient for assembly, high production efficiency and low processing cost.
  • the bonding strength of the pressure-sensitive tape 61 is relatively weak, and the shear strength between the pressure-sensitive tape 61 and the back cover 50 and the shear strength between the pressure-sensitive tape 61 and the middle frame 20 generally do not exceed 1.3 MPa, which makes the connection reliability between the back cover 50 and the middle frame 20 relatively poor.
  • the back cover 50 and the middle frame 20 are easily separated, and the structural stability of the electronic device 100 cannot be guaranteed.
  • the die-cutting width of the pressure-sensitive tape 61 is relatively wide, usually more than 0.8 mm, otherwise the die-cutting yield of the pressure-sensitive tape 61 cannot be guaranteed.
  • the bonding area between the back cover 50 and the middle frame is large, which is not conducive to realizing the lightweight design of the electronic device 100, and limits the further increase of the assembly space of the battery 40, circuit board 30 and other devices inside the electronic device 100, which is not conducive to improving the endurance of the electronic device 100 and optimizing its performance.
  • bonding strength refers to the stress required to destroy the interface between the bonding structure 60 (such as the pressure-sensitive tape 61, the hot melt adhesive 62, and the UV-curing tape layer mentioned below, etc.) and the adherend or its vicinity under the action of an external force. Bonding strength is also called adhesive strength. Shear strength is one of the ways to characterize bonding strength. Shear strength, which can also be called dynamic shear strength, lap shear strength, etc., refers to the stress required to destroy the interface between the bonding structure 60 (such as the pressure-sensitive tape 61, the hot melt adhesive 62, the UV-curing tape layer, etc.) and the adherend or its vicinity under the action of an external force parallel to the bonding surface. The shear strength can be tested with reference to GB/T 33332-2016 "Test method for dynamic shear strength of adhesive tape".
  • FIG. 6 is a schematic diagram of the assembly of the back cover 50 and the adhesive structure 60 provided in other embodiments of the present application.
  • the adhesive structure 60 includes a hot melt adhesive 62 in addition to the pressure-sensitive adhesive tape 61.
  • the back cover 50 and the middle frame 20 can be bonded and connected by the hot melt adhesive 62 and the pressure-sensitive adhesive tape 61.
  • the adhesive structure 60 can also include only the hot melt adhesive 62 without including the pressure-sensitive adhesive tape 61.
  • the full name of the hot melt adhesive 62 (polyurethane reactive, PUR) is moisture-curing reactive polyurethane hot melt adhesive 62, and its main component is terminal isocyanate polyurethane prepolymer. Since the hot melt adhesive 62 has a strong bonding strength, the shear strength between the hot melt adhesive 62 and the back cover 50 and the shear strength between the hot melt adhesive 62 and the middle frame 20 can reach more than 14Mpa.
  • the connection strength between the back cover 50 and the middle frame 20 can be improved, and the connection reliability between the back cover 50 and the middle frame 20 can be improved.
  • the hot melt adhesive 62 needs to be set on the back cover 50 and/or the middle frame 20 through the dispensing process, the assembly process is complicated and the processing cost is high.
  • the shear strength between the hot melt adhesive 62 and the back cover 50 is relatively large.
  • FIG. 7 is a cross-sectional view of an electronic device 100 provided in some embodiments of the present application.
  • the bonding structure 60 includes an ultraviolet curing tape layer 63, and the back cover 50 and the middle frame 20 are bonded and fixed by the ultraviolet (UV) curing tape layer 63.
  • the ultraviolet curing tape layer 63 is connected between the ink layer 52 and the middle frame 20.
  • the UV curable tape layer 63 can be formed by a UV curable tape through a photocuring process.
  • the “photocuring process” is a process in which the photoinitiator in the material is stimulated to become a free radical or a cation under the UV radiation by using the medium and short wave UV light (300 nm to 800 nm), thereby initiating the polymerization of the polymer material (resin) containing active functional groups into a solid coating film.
  • the UV-curable adhesive tape is a kind of adhesive tape with initial adhesion, which can be cured after being activated by UV light to form the UV-curable adhesive tape layer 63. That is, the UV-curable adhesive tape layer 63 is the cured UV-curable adhesive tape.
  • the shear strength between the UV-curable tape layer 63 and the ink layer 52 of the back cover 50 is greater than or equal to 1.5 MPa, and the shear strength between the UV-curable tape layer 63 and the middle frame 20 is greater than or equal to 1.5 MPa.
  • the shear strength between the UV-curable tape layer 63 and the ink layer 52 can be 1.5 MPa, 1.6 MPa, 1.8 MPa, 2 MPa, 2.5 MPa, 3 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5 MPa, 5.5 MPa, 6 MPa, 6.5 MPa, 7 MPa, etc.
  • the shear strength between the UV-curable tape layer 63 and the middle frame 20 can be 1.5 MPa, 1.6 MPa, 1.8 MPa, 2 MPa, 2.5 MPa, 3 MPa, 3.5 MPa, 4 MPa, 4.5 MPa, 5 MPa, 5.5 MPa, 6 MPa, 6.5 MPa, 7 MPa, etc. 6.5MPa, 7MPa, 8MPa, 9MPa, 10MPa, 11MPa, 12MPa, etc. It is understandable that the shear strength between the UV-curable tape layer 63 and the ink layer 52 and the shear strength between the UV-curable tape layer 63 and the middle frame 20 may be the same or different.
  • the UV-curing tape that has not been photocured can be set on the side surface of the back cover 50 facing the middle frame 20 (that is, the inner surface of the back cover 50), or the UV-curing tape that has not been photocured can be set on the side surface of the middle frame 20 facing the back cover 50, and ultraviolet light is used to irradiate the position where the UV-curing tape is set on the back cover 50 or the middle frame 20 to activate the UV-curing tape.
  • the back cover 50 and the middle frame 20 are bonded together with the help of the light-activated UV-curing tape, and then the back cover 50 and the middle frame 20 that are bonded together are quickly pressurized with the help of a pressure-holding fixture.
  • the UV-curing tape is cured to form a UV-curing tape layer 63, thereby achieving bonding and fixation between the back cover 50 and the middle frame 20.
  • the holding time may be 60s to 120s.
  • the holding time may be 60s, 65s, 70s, 75s, 80s, 85s, 90s, 95s, 100s, 105s, 110s, 115s, 120s, etc.
  • the electronic device 100 in the present application is bonded and fixed to the back cover 50 and the middle frame 20 by the UV curing tape layer 63.
  • the UV curing tape layer 63 and the UV curing tape are easier to clean than the pressure sensitive tape 61 and the hot melt adhesive 62, and no residue will be left, which can improve the rework yield.
  • the electronic device 100 in the present application by setting the shear strength between the UV-curing tape layer 63 and the ink layer 52 of the back cover 50 to be greater than or equal to 1.5Mpa, and the shear strength between the UV-curing tape layer 63 and the middle frame 20 to be greater than or equal to 1.5Mpa, can ensure the bonding strength between the UV-curing tape layer 63 and the ink layer 52 and the middle frame 20, thereby ensuring the bonding strength between the back cover 50 and the middle frame 20, so as to improve the connection reliability between the back cover 50 and the middle frame 20, and in the scenario where the electronic device 100 falls or is hit, it can reduce the risk of separation between the back cover 50 and the middle frame 20.
  • the electronic device 100 in the present application can simplify the assembly process between the back cover 50 and the middle frame 20 on the basis of improving the connection reliability between the back cover 50 and the middle frame 20, reduce the difficulty of assembling the back cover 50 and the middle frame 20, and thus reduce the processing cost of the electronic device 100.
  • the shear strength between the UV-curable tape layer 63 and the ink layer 52 of the back cover 50 is less than or equal to 7 MPa. That is, the shear strength between the UV-curable tape layer 63 and the ink layer 52 of the back cover 50 is in the range of 1.5 MPa to 7 MPa. In this way, the bonding strength and impact resistance between the UV-curable tape layer 63 and the ink layer 52 can be moderate.
  • the connection reliability between the back cover 50 and the middle frame 20 can be ensured, and the risk of separation of the back cover 50 and the middle frame 20 can be effectively reduced when the electronic device 100 falls or is hit; on the other hand, when the electronic device 100 falls or the back cover 50 is disassembled during the repair process of the electronic device 100, the UV-curable tape layer 63 can be prevented from pulling off the ink layer 52 on the back cover 50, thereby effectively reducing the risk of the ink layer 52 falling off, which is conducive to extending the service life of the electronic device 100.
  • the shear strength between the UV-curable tape layer 63 and the middle frame 20 is less than or equal to 7Mpa. That is, the shear strength between the UV-curable tape layer 63 and the middle frame 20 is in the range of 1.5MPa to 7MPa. In this way, on the one hand, the difficulty of disassembling the back cover 50 and the middle frame 20 can be reduced. During the repair process of the electronic device 100, it is convenient to remove the back cover 50 from the middle frame 20, which is beneficial to improve the repair efficiency and shorten the repair time. On the other hand, the shear strength between the UV-curable tape layer 63 and the back cover 50 and the UV-curable adhesive layer 63 can be reduced.
  • the difference in shear strength between the tape layer 63 and the middle frame 20 can roughly balance the bonding strength between the UV-curing tape layer 63 and the back cover 50 and the middle frame 20, thereby improving the force uniformity of the UV-curing tape layer 63, which is beneficial to improving the overall structural stability of the electronic device 100.
  • the initial adhesion between the UV-curing tape and the ink layer 52 of the back cover 50 is greater than or equal to 0.2N/mm.
  • the initial adhesion between the UV-curing tape and the ink layer 52 of the back cover 50 can be 0.2N/mm, 0.3N/mm, 0.4N/mm, 0.5N/mm, 0.6N/mm, 0.7N/mm, 0.8N/mm, 0.9N/mm, 1.0N/mm.
  • the initial adhesion in the embodiments of the present application refers to: when the UV-curing tape is not UV-cured, when the adhesive surface of the UV-curing tape and the object are in short contact with a small pressure, the adhesion effect of the UV-curing tape on the object.
  • the initial tack can be tested with reference to GB/T 4852-2002 "Test method for initial tack of pressure-sensitive adhesive tapes (rolling ball method)".
  • the bonding strength between the UV-curing tape that has not been photocured and the back cover 50 can be ensured, the UV-curing tape that has not been photocured can be prevented from slipping off the back cover 50, and the positioning reliability between the UV-curing tape that has not been photocured and the back cover 50 can be improved, thereby reducing the difficulty of assembling the back cover 50 and the middle frame 20 and improving the assembly yield of the electronic device 100.
  • the initial adhesion between the UV curing tape and the ink layer 52 of the back cover 50 is less than or equal to 1.0 N/mm. In this way, the processing difficulty and cost of the UV curing tape can be reduced, thereby reducing the overall cost of the electronic device 100.
  • the initial adhesion between the UV-curable adhesive tape and the middle frame 20 may also be greater than or equal to 0.2 N/mm. Further, the initial adhesion between the UV-curable adhesive tape and the middle frame 20 is less than or equal to 1.0 N/mm.
  • the die-cut width of the UV-curable tape is less than 0.8 mm. Furthermore, the die-cut width of the UV-curable tape is less than or equal to 0.5 mm.
  • the die-cut width of the UV-curable tape refers to the die-cut width of the UV-curable tape when the UV-curable tape is not subjected to light curing treatment.
  • the UV curing tape can be die-cut according to actual needs, and the UV curing tape can be die-cut to a required width. Since the UV curing tape has a small die-cut width, it can meet the different width requirements of the UV curing tape layer 63 at different bonding locations, making the bonding between the middle frame 20 and the back cover 50 more flexible, facilitating the assembly of the internal components of the electronic device 100, and helping to increase the assembly space of the components such as the battery 40 and the circuit board 30 of the electronic device 100.
  • the width w of at least part of the UV-curable tape layer 63 is less than 0.8 mm. That is, the width of a part of the UV-curable tape layer 63 may be less than 0.8 mm, or the width of all the UV-curable tape layers 63 is less than 0.8 mm. Further, the width w of at least part of the UV-curable tape layer 63 may be less than or equal to 0.5 mm.
  • the width w of at least part of the UV-curable tape layer 63 is greater than or equal to 0.25 mm and less than or equal to 0.5 mm.
  • the width w of at least part of the UV-curable tape layer 63 can be 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc. In this way, the bonding between the back cover 50 and the middle frame 20 can be ensured.
  • the bonding area between the back cover 50 and the middle frame 20 is reduced, so that the assembly space of the battery 40, the circuit board 30 and other devices can be increased without increasing the overall volume of the electronic device 100, which is conducive to increasing the volume of the battery 40, the circuit board 30 and other devices, thereby improving the endurance of the electronic device 100, and is conducive to expanding the functions of the electronic device 100 and optimizing the performance of the electronic device 100.
  • it is also conducive to reducing the volume of the electronic device 100 and realizing a lightweight design of the electronic device 100.
  • the thickness t of the UV-curable tape layer 63 is greater than or equal to 0.15 mm and less than or equal to 0.45 mm.
  • the thickness of the UV-curable tape layer 63 may be 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.38 mm, 0.4 mm, 0.42 mm, 0.45 mm, etc.
  • the thickness direction of the UV-curable tape layer 63 is parallel to the thickness direction of the electronic device 100, that is, the thickness of the UV-curable tape layer 63 is parallel to the Z-axis direction.
  • the UV-curing tape layer 63 can effectively absorb the manufacturing flatness problems of the back cover 50 and the middle frame 20, thereby improving the assembly yield between the back cover 50 and the middle frame 20.
  • FIG. 8 is a schematic diagram of the laminated structure of the UV-curable tape 630 provided in some embodiments of the present application.
  • a UV-curable tape layer 63 can be formed.
  • the UV-curable tape 630 includes a substrate 631, a first adhesive film 632, and a second adhesive film 633.
  • the substrate 631 includes a first surface 631a and a second surface 631b opposite to each other, the first adhesive film 632 is arranged on the first surface 631a, and the second adhesive film 633 is arranged on the second surface 631b.
  • the first adhesive film 632 can be used for bonding and fixing with the back cover 50, and the second adhesive film 633 can be used for bonding and fixing with the middle frame 20.
  • the first adhesive film 632 and the second adhesive film 633 both include a UV-curable composition. Specifically, the first adhesive film 632 is bonded and fixed to the back cover 50 after curing, and the second adhesive film 633 is bonded and fixed to the middle frame 20 after curing.
  • the UV-curable tape 630 in this embodiment has a simple structure and is easy to process.
  • the UV-curable composition in the first adhesive film 632 and the UV-curable composition in the second adhesive film 633 can be adjusted according to the materials of the middle frame 20 and the back cover 50, so that the shear strength between the cured first adhesive film 632 and the ink layer 52 of the back cover 50 and the shear strength between the cured second adhesive film 633 and the middle frame 20 are moderate.
  • the thickness of the UV-curable tape 630 may be the same as the thickness of the UV-curable tape layer 63 .
  • the UV curable composition in the first adhesive film 632 may be the same as the UV curable composition in the second adhesive film 633.
  • the UV curable composition of the first adhesive film 632 is taken as an example for description.
  • the UV-curable composition includes an acrylic polymer, a curable component and a photobase initiator.
  • the acrylic polymer may include a (meth) acrylic polymer.
  • the curable component includes a multifunctional thiol and a multifunctional epoxy resin.
  • the photobase initiator in the UV-curable composition can produce an alkaline catalyst to catalyze the reaction of the curable component in the UV-curable composition, thereby improving the bonding strength between the UV-curable tape layer 63 and the bonding interface.
  • the multifunctional thiol in the embodiment of the present application refers to a compound having two or more thiol groups (thiol groups) in the molecule.
  • the multifunctional thiol may include: trimethylolpropane trithiopropionate, pentaerythritol tetrathiopropionate, ethylene glycol bisthioacetate, 1,4-butanediol bisthioacetate, trimethylolpropane trimerioacetate, pentaerythritol tetrathioacetate, di(2-mercaptoethyl) ether, 1,4-butanediol, 1,5-dimercapto-3-thiapentane, 1,8-dimercaptoacetate,
  • the present invention also includes, but is not limited to, 1,3,5-trimercaptomethylbenzene, 4,4'-dimercaptodiphenyl sulfide, 1,3,5-trimercaptomethyl-2,4,6
  • Multifunctional epoxy resin refers to an epoxy resin having two or more epoxy groups per molecule on average.
  • Multifunctional epoxy resins include, but are not limited to, glycidyl ethers of etherified multifunctional phenols, glycidyl amines of epoxidized multifunctional amines, glycidyl esters of esterified multifunctional acids, alicyclic epoxies, epoxidized (poly)olefins, and the like.
  • Photobase initiators are compounds that can generate alkaline substances under the irradiation of light.
  • Photobase initiators can include at least one of cobalt ammonia complexes, oxime esters, quaternary ammonium salts, and borates.
  • the photobase initiator in the embodiment of the present application catalyzes the curing reaction by generating an alkaline catalyst. Its curing is not as easily affected by moisture and alkaline substances as photoacid curing, and will not cause corrosion to the surface of the metal substrate. In addition, its curing efficiency is high, and a small amount of photobase initiator can catalyze the crosslinking reaction to achieve the strength of a semi-structural adhesive or a structural adhesive.
  • the monomer of the acrylic polymer includes an acryl monomer containing a hydroxyl functional group.
  • the acryl monomer refers to a monomer containing an acryl group in the molecule.
  • the monomer of the acrylic polymer may include hydroxyalkyl acrylates, such as hydroxymethyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxymethyl methacrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, etc.
  • the hydroxyl functional group has good wettability with the main resin, matte powder and other materials in the ink layer 52.
  • the monomer of the acrylic polymer includes an acryl monomer containing a hydroxyl functional group, the wettability between the UV-curable composition and the ink layer 52 can be improved, thereby improving the shear strength between the UV-curable tape layer 63 and the back cover 50, so that the UV-curable tape layer 63 is not only suitable for bonding interfaces such as metal, PC, PMMA, etc., but also suitable for bonding interfaces including the ink layer 52, so that the UV-curable tape layer 63 can be suitable for bonding interfaces of a variety of different materials.
  • the ratio of the mass of the acrylic polymer to the mass of the UV-curable composition in the UV-curable tape layer 63 is greater than or equal to 60%. That is, after the UV-curable tape is cured, the mass fraction of the acrylic polymer is greater than or equal to 60%.
  • the mass fraction of the acrylic polymer in the UV-curable tape layer 63 can be 60%, 62%, 65%, 68%, 70%, 72%, 75%, 78%, 80%, etc.
  • the shear strength between the UV-curing tape layer 63 and the ink layer 52 of the back cover 50 can be controlled to be between 1.5MPa and 7MPa, which can significantly improve the bonding strength between the UV-curing tape layer 63 and the ink layer 52 while preventing the UV-curing tape layer 63 from pulling off the ink layer 52 on the back cover 50 when the electronic device 100 falls or the back cover 50 is disassembled during the repair of the electronic device 100, thereby effectively reducing the risk of the ink layer 52 falling off, which is beneficial to extending the service life of the electronic device 100; on the other hand, the initial viscosity of the UV-curing tape 630 can be significantly improved, thereby improving the positioning performance of the UV-curing tape.
  • the substrate 631 In order to facilitate UV light activation of the UV curable tape 630, the substrate 631 The light transmittance is greater than or equal to 92%. Exemplarily, the light transmittance of the substrate 631 can be 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc. In this way, when the UV-curing tape 630 is set on the back cover 50, the second adhesive film 633 can be exposed, the UV light can directly activate the second adhesive film 633, and the UV light can activate the first adhesive film 632 through the substrate 631. Similarly, when the UV-curing tape 630 is set on the middle frame 20, the first adhesive film 632 can be exposed, the UV light can directly activate the first adhesive film 632, and the UV light can activate the second adhesive film 633 through the substrate 631.
  • the substrate 631 is a transparent plastic part.
  • the material of the substrate 631 may include at least one of polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), and polycarbonate (PC). That is, the material of the substrate 631 may include one of PET, PMMA, and PC. Or the material of the substrate 631 may include two of PET, PMMA, and PC, or the material of the substrate 631 may include PET, PMMA, and PC. These materials have good light transmittance, are inexpensive, and are easily available.
  • FIG. 9 is a schematic diagram of the structure of the UV-curable tape 630 provided in other embodiments of the present application.
  • the UV-curable tape 630 may not include the substrate 631.
  • the UV-curable tape 630 may only include the first adhesive film 632. That is, the UV-curable tape layer 63 is a substrate-free adhesive film. It is understood that, in other embodiments, the UV-curable tape 630 may also only include the second adhesive film 633.
  • the first adhesive film 632 includes a first adhesive surface 63a and a second adhesive surface 63b, wherein the first adhesive surface 63a can be bonded to the back cover 50, and the second adhesive surface 63b can be bonded to the middle frame 20.
  • the middle frame 20 and the back cover 50 can also be bonded and fixed, and the UV curing tape 630 has a simple structure and is easy to process.
  • the middle frame 20 and the back cover 50 are bonded and fixed by means of the UV-curable tape layer 63.
  • the UV-curable tape layer 63 can adapt to the bonding of various interfaces, and the bonding strength is significantly better than the pressure-sensitive tape 61, which can reduce the risk of the back cover 50 and the middle frame 20 being separated in the case of falling and impact.
  • the bonding strength and impact resistance between the UV-curable tape layer 63 and the back cover 50 and the middle frame 20 are moderate, and the problem of the ink layer 52 falling off due to excessive bonding strength will not occur.
  • the bonding scheme of the UV-curable tape layer 63 has high assembly and processing efficiency and low cost for the electronic device 100, and the UV-curable tape layer 63 and the UV-curable tape 630 used to form the UV-curable tape layer 63 are easier to clean, and there will be no residue or overflow problems, which can improve the rework yield.
  • the UV-curable tape 630 used to form the UV-curable tape layer 63 has a small die-cut width, which can be less than or equal to 0.5 mm, which can meet the requirements of the electronic device 100 for the width of the UV-curable tape layer 63, which is conducive to increasing the installation space of the battery 40, circuit board 30 and other components of the electronic device, and is conducive to realizing the light and thin design of the electronic device 100.
  • the embodiment of the present application also provides an assembly method of an electronic device 100.
  • the electronic device 100 in this embodiment can be the electronic device 100 in any of the above embodiments.
  • FIG. 10 is a flow chart of an assembly method of an electronic device provided in some embodiments of the present application.
  • the assembly method of the electronic device includes:
  • Step S100 providing a first structural member, wherein the first structural member includes a first bonding area
  • Step S200 placing an uncured UV-curable tape on a first bonding area of a first structural member
  • Step S300 irradiating the first bonding area provided with the UV-curable tape with UV light to activate the UV-curable tape;
  • Step S400 providing a second structural member, the second structural member including a second bonding area, disposing the second structural member on one side of the first structural member, and connecting an ultraviolet curing tape between the first bonding area and the second bonding area to form a first blank;
  • Step S500 The first blank is subjected to a pressure-maintaining treatment for a preset time, and the UV-curing tape forms a UV-curing tape layer. Specifically, during the pressure-maintaining treatment of the first blank, the UV-curing tape can be cured to form a UV-curing tape layer.
  • the shear strength between the UV-curable tape layer and the first bonding area is greater than or equal to 1.5 Mpa, and the shear strength between the UV-curable tape layer and the second bonding area is greater than or equal to 1.5 Mpa. In this way, the bonding strength between the UV-curable tape layer and the first bonding area and the second bonding area can be ensured, thereby ensuring the connection reliability between the first structural member and the second structural member.
  • the first structural member includes a back cover
  • the second structural member includes a middle frame.
  • the first bonding area is located on the ink layer of the back cover
  • the second bonding area is located on the middle frame.
  • the first structural member may include the middle frame
  • the second structural member may include the back cover. In this case, the first bonding area is located on the middle frame, and the second bonding area is located on the ink layer of the back cover.
  • the structural member including the middle frame may also include a battery, a circuit board, etc. disposed on the middle frame.
  • the structural member including the middle frame may also only include the middle frame without including other devices.
  • the assembly method of the electronic device in the present application only needs to light-activate the uncured UV-curable tape and press-fit the first structural member and the second structural member to achieve the assembly between the first structural member and the second structural member, and the process is simple, the processing efficiency is high and the cost is low.
  • a UV-curable tape layer is formed, which can ensure the connection strength between the first structural member and the second structural member, thereby ensuring the bonding strength between the back cover and the middle frame, so as to improve the connection reliability between the back cover and the middle frame, and reduce the risk of separation between the back cover and the middle frame in the scenario where the electronic device falls or is hit.
  • the UV-curable tape layer and the UV-curable tape are easier to clean and will not leave residue, which can improve the repair yield of the electronic device.
  • the initial adhesion between the UV-curing tape and the first bonding area is greater than or equal to 0.2N/mm. Specifically, when the first bonding area is located on the ink layer, the initial adhesion between the UV-curing tape and the ink layer is greater than or equal to 0.2N/mm. When the first bonding area is located on the middle frame, the initial adhesion between the UV-curing tape and the middle frame is greater than or equal to 0.2N/mm.
  • the bonding strength between the uncured UV-curing tape and the first bonding area can be ensured, the uncured UV-curing tape can be prevented from slipping off the first bonding area, the positioning reliability between the uncured UV-curing tape and the first structural member can be improved, and the difficulty of assembling the electronic device can be reduced, which is conducive to improving the assembly yield of the electronic device.
  • the laminated structure, thickness, die-cut width, and UV-curable composition of the UV-curable tape may be designed with reference to the UV-curable tape in any of the above embodiments, and will not be described in detail here.
  • the preset time length for the pressure holding treatment of the first blank includes: using a pressure holding fixture to pressure hold the first blank for 60s to 120s.
  • the pressure holding time may be 60s, 65s, 70s, 75s, 80s, 85s, 90s, 95s, 100s, 105s, 110s, 115s, 120s, etc.
  • FIG. 11 is a flow chart of an assembly method of an electronic device 100 provided in some embodiments of the present application.
  • the assembly method of the electronic device 100 includes:
  • Step S100a providing a first structural member, the first structural member comprising a back cover 50, the back cover 50 comprising an ink layer 52, and a first bonding area 501 is provided on the ink layer 52;
  • the material of the ink layer includes a main resin and matte powder.
  • the first bonding area 501 is located at the edge of the back cover 50.
  • the first bonding area 501 is annular.
  • Step S200a placing the UV curing tape 630 on the first bonding area 501 on the ink layer 52;
  • the fixed UV curing tape 630 is a substrate-free adhesive film.
  • Step S300a irradiating the first bonding area 501 provided with the UV curing tape 630 with UV light to activate the UV curing tape 630;
  • Step S400a Provide a second structural member, the second structural member includes a middle frame 20, and a second bonding area is provided on the middle frame 20.
  • the second structural member is arranged on one side of the first structural member, and the UV-curing tape 630 is connected between the first bonding area 501 and the second bonding area to form a first blank; then a pressure-maintaining jig is used to perform pressure-maintaining treatment on the first blank for 90s.
  • the UV-curable tape 630 in step S400a is the UV-curable tape 630 activated by UV light.
  • the method before the second structural member is disposed on one side of the first structural member, the method further includes: assembling devices such as a battery, a circuit, and a screen on the middle frame.
  • Fig. 12 is an enlarged view of the area A in the flow diagram shown in Fig. 11.
  • the UV curing tape layer 63 (that is, the cured UV curing tape) is connected between the middle frame 20 and the back cover 50, and the screen 10 is connected to the side of the middle frame 20 away from the back cover 50.
  • the performance of the electronic device 100 is shown in Table 1.
  • the assembly method of the electronic device includes:
  • Step S100b providing a first structural member, the first structural member comprising a back cover, the back cover comprising an ink layer, and a first bonding area is provided on the ink layer;
  • Step S200b placing a pressure-sensitive adhesive tape on the first bonding area on the ink layer;
  • Step S300b Provide a second structural member, the second structural member includes a middle frame, and a second bonding area is provided on the middle frame.
  • the second structural member is arranged on the side of the first structural member away from the pressure-sensitive tape, and the pressure-sensitive tape is connected between the first bonding area and the second bonding area to form a second blank, and then a pressure-maintaining fixture is used to perform pressure-maintaining treatment on the second blank.
  • the bonding structure between the middle frame and the back cover of the electronic device is a UV-curable tape layer
  • the thickness of the UV-curable tape layer is 0.3 mm
  • the initial adhesion between the UV-curable tape and the ink layer is 0.35 N/mm
  • the mass fraction of the acrylic polymer in the UV-curable composition of the UV-curable tape layer is 60%
  • the monomer of the acrylic polymer includes an acryl monomer containing a hydroxyl functional group.
  • the electronic device in Example 1 has a strong connection reliability between the back cover and the middle frame, and the electronic device exhibits excellent anti-drop performance in the drum drop performance test.
  • the shear strength between the ink layer of the back cover and the UV-curable tape layer is 3.58 MPa, and the back cover and the middle frame do not separate when the electronic device is dropped 2000 times in the drum drop performance test.
  • the initial adhesion between the UV-curing tape and the ink layer can be tested with reference to GB/T4852-2002 "Test method for initial adhesion of pressure-sensitive adhesive tape (rolling ball method)".
  • the shear strength between the back cover and the UV-curing tape layer can be tested with reference to GB/T 33332-2016 "Test method for dynamic shear strength of adhesive tape”.
  • the drum drop test is to conduct a continuous rotation drop test on the electronic device through a drum drop tester. After the number of times set by the counter is reached, the electronic device is taken out to evaluate the ability of the electronic device to withstand rotation and drop.
  • the connection reliability between the middle frame and the back cover can be improved, the impact resistance of the electronic device can be improved, and the separation of the back cover and the middle frame can be effectively prevented when the electronic device falls.

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Abstract

本申请公开一种电子设备和电子设备的装配方法,涉及电子产品技术领域,该电子设备能在提高背盖与中框之间连接可靠性的同时,降低电子设备的装配难度。其中,电子设备包括中框、背盖和紫外光固化胶带层,背盖设在中框的一侧,背盖包括基材和油墨层,油墨层设置于基材的朝向中框的一侧表面;背盖与中框通过紫外光固化胶带层粘接固定,紫外光固化胶带层连接于油墨层与中框之间,紫外光固化胶带层与油墨层之间的剪切强度大于或等于1.5MPa,且紫外光固化胶带层与中框之间的剪切强度大于或等于1.5MPa。

Description

电子设备和电子设备的装配方法
本申请要求于2023年03月24日提交国家知识产权局、申请号为202310299959.9、发明名称为“电子设备和电子设备的装配方法”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及电子产品技术领域,尤其涉及一种电子设备和电子设备的装配方法。
背景技术
相关技术中的电子设备,中框和背盖通常通过压敏胶带和热熔胶中的至少一种粘接结构进行粘接固定。采用压敏胶带对中框和背盖进行粘接时,装配方便,生产效率高且加工成本低。但是,压敏胶带的粘接强度较弱,使得背盖与中框之间的连接可靠性较差。采用热熔胶或者热熔胶结合压敏胶带对中框和背盖进行粘接时,能提高背盖与中框之间的连接可靠性,但是,热熔胶需通过点胶工艺设置于背盖和/或中框上,装配工艺复杂,加工成本高。因此,如何在提高背盖与中框之间连接可靠性的同时,降低电子设备的装配难度,是目前亟待解决的技术问题。
发明内容
本申请实施例提供一种电子设备和电子设备的装配方法,能在提高背盖与中框之间连接可靠性的同时,降低电子设备的装配难度。
为达到上述目的,本申请的实施例采用如下技术方案:
第一方面,本申请提供一种电子设备,包括中框、背盖和紫外光固化胶带层,背盖设在中框的一侧,背盖包括基材和油墨层,油墨层设置于基材的朝向中框的一侧表面;背盖与中框通过紫外光固化胶带层粘接固定,紫外光固化胶带层连接于油墨层与中框之间,紫外光固化胶带层与油墨层之间的剪切强度大于或等于1.5MPa,且紫外光固化胶带层与中框之间的剪切强度大于或等于1.5MPa。
本申请中的电子设备,背盖与中框通过紫外光固化胶带层粘接固定,在装配过程中,只需对未经光固化处理的紫外光固化胶带进行光激活,并对背盖与中框进行压合处理,即可实现背盖与中框之间的组装,工艺简单、加工效率高且成本低。并且,紫外光固化胶带层和紫外光固化胶带相对于压敏胶带和热熔胶来说,更易清洁,不会出现残留,可提高返修良率。与此同时,本申请中的电子设备,通过将紫外光固化胶带层与背盖的油墨层之间的剪切强度设置为大于或等于1.5Mpa,紫外光固化胶带层与中框之间的剪切强度设置为大于或等于1.5Mpa,能够保证紫外光固化胶带层与油墨层、中框之间的粘接强度,从而能保证背盖与中框之间的粘接强度,以提高背盖与中框之间的连接可靠性,在电子设备跌落或被撞击的场景中,能降低背盖和中框分离的风险。这样一来,本申请中的电子设备,能在提高背盖与中框之间连接可靠性的基础上,简化背盖与中框之间的装配工艺,降低背盖与中框的装配难度,从而能降低电子设备的加工成本。
在第一方面的一种可能的实现方式中,紫外光固化胶带层与油墨层之间的剪切强 度小于或等于7MPa。也即是,紫外光固化胶带层与背盖之间的剪切强度的范围为1.5MPa~7MPa。这样,可以使得紫外光固化胶带层与油墨层之间的粘接强度和抗冲击能力适中,一方面能保证背盖与中框之间的连接可靠性,能有效地降低电子设备跌落或被撞击时,背盖与中框分离的风险;另一方面,在电子设备跌落或者在电子设备返修过程中拆卸背盖时,可以避免紫外光固化胶带层将背盖上的油墨层拉掉,从而能有效地降低油墨层脱落的风险,有利于延长电子设备的使用寿命。
在第一方面的一种可能的实现方式中,紫外光固化胶带层与中框之间的剪切强度小于或等于7MPa。也即是,紫外光固化胶带层与中框之间的剪切强度的范围为1.5MPa~7MPa。这样,一方面,可以降低背盖与中框之间的拆卸难度,在电子设备返修过程中,便于将背盖从中框上拆卸下来,有利于提高返修效率,缩短返修时间。另一方面,可以减小紫外光固化胶带层与背盖之间的剪切强度、紫外光固化胶带层与中框之间的剪切强度二者的差值,能使得紫外光固化胶带层与背盖、中框之间的粘接强度大体平衡,进而能提高紫外光固化胶带层的受力均匀性,有利于提高电子设备的整体结构稳定性。
在第一方面的一种可能的实现方式中,至少部分紫外光固化胶带层的宽度小于0.8mm。进一步的,紫外光固化胶带层的宽度小于或等于0.5mm。这样,有利于减小背盖与中框之间的粘接面积,从而能在不增大电子设备整体体积的基础上,增大电池、电路板等器件的装配空间,有利于增大电池、电路板等器件的体积,从而有利于提高电子设备的续航能力,且有利于拓展电子设备的功能,实现电子设备性能的优化。此外,还有利于减小电子设备的体积,实现电子设备的轻薄化设计。
在第一方面的一种可能的实现方式中,至少部分紫外光固化胶带层的宽度大于等于0.25mm。示例性的,紫外光固化胶带层的宽度w可以为0.25mm、0.3mm、0.35mm、0.4mm、0.45mm、0.5mm、0.6mm、0.7mm、0.8mm等。这样,能在保证背盖与中框之间的粘接强度。
在第一方面的一种可能的实现方式中,至少部分紫外光固化胶带层的宽度大于等于0.25mm且小于或等于0.5mm。这样,能在保证背盖与中框之间的粘接强度的同时,减小背盖与中框之间的粘接面积,从而能在不增大电子设备整体体积的基础上,增大电池、电路板等器件的装配空间,有利于增大电池、电路板等器件的体积,从而有利于提高电子设备的续航能力,且有利于拓展电子设备的功能,实现电子设备性能的优化。此外,还有利于减小电子设备的体积,实现电子设备的轻薄化设计。
在第一方面的一种可能的实现方式中,紫外光固化胶带层的厚度大于或等于0.15mm且小于或等于0.45mm。这样,一方面便于通过紫外光对紫外光固化胶带进行光激活,能保证背盖与中框之间的连接强度,提高电子设备的抗跌落能力;另一方面能减小中框、紫外光固化胶带层、背盖在电子设备厚度方向(也即是Z轴方向)上的尺寸;再一方面,可以有效地吸收背盖以及中框的制造平面度问题,能提高背盖与中框之间的装配良率。
在第一方面的一种可能的实现方式中,紫外光固化胶带层由紫外光固化胶带经光固化处理形成,紫外光固化胶带包括:基体、第一胶膜和第二胶膜,基体为透明件,基体包括相对的第一表面和第二表面,第一表面朝向背盖;第一胶膜设置于基体的第 一表面,第一胶膜用于与背盖粘接固定;第二胶膜设置于基体的第二表面,第二胶膜用于与中框粘接固定,第一胶膜和第二胶膜均包括紫外光固化组合物。该实施例中的紫外光固化胶带的结构简单,加工方便,并且可以根据中框与背盖的材质调整第一胶膜中紫外光固化组合物以及第二胶膜中紫外光固化组合物,使得固化后的第一胶膜与背盖的油墨层之间的剪切强度以及固化后的第二胶膜与中框之间的剪切强度适中。
在第一方面的一种可能的实现方式中,第一胶膜中的紫外光固化组合物与第二胶膜中的紫外光固化组合物相同。
在第一方面的一种可能的实现方式中,基体的透光率大于等于92%。这样,将紫外光固化胶带设置到背盖上时,第二胶膜可以外露,紫外光可以直接对第二胶膜进行激活,且紫外光可以透过基体对第一胶膜进行激活。同样的,将紫外光固化胶带设置到中框上时,第一胶膜可以外露,紫外光可以直接对第一胶膜进行激活,且紫外光可以透过基体对第二胶膜633进行激活。由此,便于对紫外光固化胶带进行紫外光激活处理。
在第一方面的一种可能的实现方式中,基体为透明塑料件。示例性的,基体的材质可以包括聚对苯二甲酸乙二醇酯(polyethylene terephthalate,PET)、亚克力(polymethyl methacrylate,PMMA)、聚碳酸酯(polycarbonate,PC)中的至少一种。透明塑料件的透光性好,且价格低廉,容易获得。
在第一方面的一种可能的实现方式中,紫外光固化胶带层由紫外光固化胶带经光固化处理形成,紫外光固化胶带包括:第一胶膜,第一胶膜包括紫外光固化组合物,第一胶膜包括相背对的第一粘接面和第二粘接面,第一粘接面用于与背盖粘接,第二粘接面用于与中框粘接。这样,同样可以实现中框与背盖之间的粘接固定,且紫外光固化胶带的结构简单,加工方便。
在第一方面的一种可能的实现方式中,紫外光固化组合物包括丙烯酸类聚合物、可固化成分和光碱引发剂,丙烯酸类聚合物的单体包括含有羟基官能团的丙烯酰类单体;可固化成分包括多官能度硫醇和多官能度环氧树脂。
羟基官能团与油墨层的材料具有良好的润湿性,丙烯酸类聚合物的单体包括含有羟基官能团的丙烯酰类单体时,可以提高紫外光固化组合物与油墨层之间的润湿性,进而能提高紫外光固化胶带层与背盖之间的剪切强度,使得紫外光固化胶带层不仅能适用于金属、PC、PMMA等界面的粘接,还能适用于包括油墨层的界面的粘接,使得紫外光固化胶带层能适用于多种不同材料界面的粘接。
在第一方面的一种可能的实现方式中,紫外光固化胶带层中,丙烯酸类聚合物的质量与紫外光固化组合物的质量的比值大于或等于60%。也即是,紫外光固化胶带层中,丙烯酸类聚合物的质量分数大于或等于60%。这样,通过将紫外光固化胶带层中丙烯酸类聚合物的质量分数设置为大于或等于60%,一方面能将紫外光固化胶带层与背盖之间的剪切强度控制为1.5MPa~7MPa之间,能在显著提升紫外光固化胶带层与油墨层的粘接强度的同时,避免电子设备在跌落或者在电子设备返修过程中拆卸背盖的场景中,紫外光固化胶带层将背盖上的油墨层拉掉,从而能有效地降低油墨层脱落的风险,有利于延长电子设备的使用寿命;另一方面,可以显著提升紫外光固化胶带的初粘性的大小,从而能提升紫外光固化胶带层的定位性能。
在第一方面的一种可能的实现方式中,中框包括中板和边框,边框连接于中板的外边缘,紫外光固化胶带层连接于中板与背盖之间。提供一种具体的连接方式。
在第一方面的一种可能的实现方式中,边框通过注塑工艺形成在中板的边缘。这样,可以提高边框与中板的连接强度,且能降低中框的加工成本。
在第一方面的一种可能的实现方式中,中板为金属件、亚克力件或聚碳酸酯件。这样,可以保证中框的结构强度,且能够通过紫外光固化胶带层实现中框与背盖之间的粘接固定。
在第一方面的一种可能的实现方式中,电子设备还包括屏幕,屏幕设置于中框的背离背盖的一侧。
在第一方面的一种可能的实现方式中,紫外光固化胶带与背盖之间的初粘性大于或等于0.2N/mm。这样,可以保证未经光固化处理的紫外光固化胶带与背盖之间的粘接强度,可以避免未经光固化处理的紫外光固化胶带从背盖上滑脱,能提高未经光固化处理的紫外光固化胶带与背盖之间的定位可靠性,进而能降低背盖与中框的装配难度,提高电子设备的装配良率。
在第一方面的一种可能的实现方式中,紫外光固化胶带与背盖之间的初粘性小于或等于1N/mm。这样,能降低紫外光固化胶带的加工难度,能降低紫外光固化胶带的加工成本,进而能降低电子设备的整体成本。
在第一方面的一种可能的实现方式中,紫外光固化胶带与中框之间的初粘性大于或等于0.2N/mm。
在第一方面的一种可能的实现方式中,紫外光固化胶带与中框之间的初粘性小于或等于1N/mm。
在第一方面的一种可能的实现方式中,紫外光固化胶带的可模切宽度小于0.8mm。进一步的,紫外光固化胶带的可模切宽度小于或等于0.5mm。其中,紫外光固化胶带的可模切宽度是指,在未对紫外光固化胶带进行光固化处理时,紫外光固化胶带的模切宽度。这样,在实际应用时,可以根据实际需要对紫外光固化胶带进行模切,将紫外光固化胶带模切至所需要的宽度。由于紫外光固化胶带的可模切宽度小,能够满足不同粘接部位对紫外光固化胶带层的宽度不同需求,可使得中框与背盖之间的粘接更加灵活,便于电子设备内部器件的装配,且有利于增大电子设备的电池、电路板等器件的装配空间。
第二方面,本申请提供一种电子设备的装配方法,包括:提供第一结构件,第一结构件包括第一粘接区域;将未固化的紫外光固化胶带设置在第一结构件的第一粘接区域;对设有紫外光固化胶带的第一粘接区域进行紫外光照射,以激活紫外光固化胶带;提供第二结构件,第二结构件包括第二粘接区域,将第二结构件设置在第一结构件的一侧,并使紫外光固化胶带连接于第一粘接区域和第二粘接区域之间,形成第一坯件;对第一坯件进行保压处理预设时长,紫外光固化胶带形成紫外光固化胶带层;其中,第一结构件包括背盖,且第二结构件包括中框,第一粘接区域位于背盖的油墨层上,第二粘接区域位于中框上;或者第一结构件包括中框,且第二结构件包括背盖,第一粘接区域位于中框上,第二粘接区域位于背盖的油墨层上。
本申请中的电子设备的装配方法,在装配过程中,只需对未固化的紫外光固化胶 带进行光激活,并对第一结构件与第二结构件进行压合处理,即可实现第一结构件与第二结构件之间的组装,工艺简单、加工效率高且成本低。并且,紫外光固化胶带固化后,形成紫外光固化胶带层,能保证第一结构件和第二结构件之间的连接强度,从而能保证背盖与中框之间的粘接强度,以提高背盖与中框之间的连接可靠性,在电子设备跌落或被撞击的场景中,能降低背盖和中框分离的风险。此外,紫外光固化胶带层和紫外光固化胶带相对于压敏胶带和热熔胶来说,更易清洁,不会出现残留,可提高电子设备的返修良率。
在第二方面的一种可能的实现方式中,对第一坯件进行保压处理预设时长包括:采用保压治具对第一坯件进行保压处理60s~120s。加工效率高,有利于降低加工成本。
在第二方面的一种可能的实现方式中,紫外光固化胶带的可模切宽度小于0.8mm。进一步的,紫外光固化胶带的可模切宽度小于或等于0.5mm。其中,紫外光固化胶带的可模切宽度是指,在未对紫外光固化胶带进行光固化处理时,紫外光固化胶带的模切宽度。这样,在实际应用时,可以根据实际需要对紫外光固化胶带进行模切,将紫外光固化胶带模切至所需要的宽度。由于紫外光固化胶带的可模切宽度小,能够满足不同粘接部位对紫外光固化胶带层的宽度不同需求,可使得中框与背盖之间的粘接更加灵活,便于电子设备内部器件的装配,且有利于增大电子设备的电池、电路板等器件的装配空间。
在一些实施例中,紫外光固化胶带与第一粘接区域之间的初粘性大于或等于0.2N/mm。具体的,当第一粘接区域位于油墨层上时,紫外光固化胶带与油墨层之间的初粘性大于或等于0.2N/mm。当第一粘接区域位于中框上时,紫外光固化胶带与中框之间的初粘性大于或等于0.2N/mm。这样,可以保证未固化的紫外光固化胶带与第一粘接区域之间的粘接强度,可以避免未固化的紫外光固化胶带从第一粘接区域上滑脱,能提高未固化的紫外光固化胶带与第一结构件之间的定位可靠性,进而能降低电子设备的装配难度,有利于提高电子设备的装配良率。
在第二方面的一种可能的实现方式中,紫外光固化胶带包括:基体、第一胶膜和第二胶膜,基体为透明件,基体包括相对的第一表面和第二表面,第一表面朝向背盖;第一胶膜设置于基体的第一表面,第一胶膜用于与背盖粘接固定;第二胶膜设置于基体的第二表面,第二胶膜用于与中框粘接固定,第一胶膜和第二胶膜均包括紫外光固化组合物。
在第二方面的一种可能的实现方式中,紫外光固化胶带包括:第一胶膜,第一胶膜包括紫外光固化组合物,第一胶膜包括相背对的第一粘接面和第二粘接面,第一粘接面用于与背盖粘接,第二粘接面用于与中框粘接。
在第二方面的一种可能的实现方式中,紫外光固化组合物包括丙烯酸类聚合物、可固化成分和光碱引发剂,丙烯酸类聚合物的单体包括含有羟基官能团的丙烯酰类单体;可固化成分包括多官能度硫醇和多官能度环氧树脂。
在第二方面的一种可能的实现方式中,紫外光固化胶带的厚度大于或等于0.15mm且小于或等于0.45mm。这样,可以将紫外光固化胶带层的厚度控制在0.15mm~0.45mm范围内。
其中,第二方面中任一种设计方式所带来的技术效果可参见第一方面中不同设计 方式所带来的技术效果,此处不再赘述。
附图说明
图1为本申请一些实施例提供的电子设备的立体图;
图2为图1所示电子设备的爆炸图;
图3为图1所示电子设备在A-A线处的剖视图;
图4为本申请一些实施例提供的背盖的局部截面示意图;
图5为本申请一些实施例提供的背盖与粘接结构的装配示意图;
图6为本申请另一些实施例提供的背盖与粘接结构的装配示意图;
图7为本申请又一些实施例提供的电子设备的剖视图;
图8为本申请一些实施例提供的紫外光固化胶带的叠层结构示意图;
图9为本申请另一些实施例提供的紫外光固化胶带的结构示意图;
图10为本申请一些实施例提供的电子设备的装配方法的流程图;
图11为本申请一些实施例提供的电子设备的装配方法的流程示意图;
图12为图11中所示流程示意图中A部区域的放大图。
附图标记:
100、电子设备;10、屏幕;20、中框;21、边框;22、中板;221、装配槽;30、
电路板;31、主电路板;32、副电路板;40、电池;50、背盖;51、基材;511、第一内表面;512、第一外表面;52、油墨层;501、第一粘接区域;60、粘接结构;61、压敏胶带;62、热熔胶;63、紫外光固化胶带层;630、紫外光固化胶带;631、基体;631a、第一表面;631b、第二表面;632、第一胶膜;633、第二胶膜。
具体实施方式
在本申请实施例中,术语“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言,使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
在本申请实施例中,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此,限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。
在本申请实施例的描述中,术语“至少一个”是指一个或者多个,“多个”是指两个或两个以上。“以下至少一项(个)”或其类似表达,是指的这些项中的任意组合,包括单项(个)或复数项(个)的任意组合。例如,a,b,或c中的至少一项(个),可以表示:a,b,c,a‐b,a‐c,b‐c,或a‐b‐c,其中a,b,c可以是单个,也可以是多个。
在本申请实施例的描述中,“和/或”,仅仅是一种描述关联对象的关联关系,表示可以存在三种关系,例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况。另外,本申请中的字符“/”,一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中,需要说明的是,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”应做广义理解,例如,“连接”可以是可拆卸地连接,也可以是不可拆卸地连接;可以是直接连接,也可以通过中间媒介间接连接。其中,“固定连接” 是指彼此连接且连接后的相对位置关系不变。“转动连接”是指彼此连接且连接后能够相对转动。“滑动连接”是指彼此连接且连接后能够相对滑动。
本申请实施例中所提到的方位用语,例如,“内”、“外”、“上”、“下”、“前”、“后”、“左”、“右”等,仅是参考附图的方向,因此,使用的方位用语是为了更好、更清楚地说明及理解本申请实施例,而不是指示或暗指所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中,术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含,从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素,而且还包括没有明确列出的其他要素,或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下,由语句“包括一个……”限定的要素,并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
本申请提供一种电子设备。该电子设备包括但不限于手机、平板电脑(tablet personal computer)、膝上型电脑(laptop computer)、个人数码助理(personal digital assistant,PDA)、个人计算机、笔记本电脑、车载设备和可穿戴设备等电子设备。其中,可穿戴设备包括但不限于手表、手环等。
请参阅图1-图2,图1为本申请一些实施例提供的电子设备100的立体图,图2为图1所示电子设备100的爆炸图。本实施例中的电子设备100是以平板手机为例进行的说明。可以理解的是,在其他实施例中,电子设备100也可以是可折叠手机。请参阅图1-图2,在此示例中,电子设备100包括屏幕10、中框20、电路板30(图1未示出)、电池40(图1未示出)和背盖50(也可称为电池盖)。
可以理解的是,图1和图2以及下文相关附图仅示意性的示出了电子设备100包括的一些部件,这些部件的实际形状、实际大小、实际位置和实际构造不受图1和图2以及下文各附图限定。此外,当电子设备100为一些其他形态的设备时,电子设备100也可以不包括屏幕10。
在图1所示实施例中,电子设备100呈矩形平板状。为了方便下文各实施例的描述,建立XYZ坐标系。具体的,定义电子设备100的宽度方向为X轴方向,电子设备100的长度方向为Y轴方向,电子设备100的厚度方向为Z轴方向。可以理解的是,电子设备100的坐标系设置可以根据实际需要进行灵活设置,在此不做具体限定。在其他一些实施例中,电子设备100的形状也可以为正方形平板状、圆形平板状、椭圆形平板状等等。
屏幕10用于显示图像、视频等。请参阅图2,屏幕10包括透光盖板11和显示屏12。透光盖板11与显示屏12层叠设置。透光盖板11主要用于对显示屏12起到保护以及防尘作用。显示屏12可以为柔性显示屏,也可以为刚性显示屏。例如,显示屏12可以为有机发光二极管(organic light-emitting diode,OLED)显示屏、液晶显示屏(liquid crystal display,LCD)等。
中框20形成电子设备100的壳体的一部分。也即是,电子设备100的壳体包括中框20。中框20用作电子设备100的支撑骨架,用于安装屏幕10、电路板30、电池40等电子器件。请参阅图2并结合图3,图3为图1所示电子设备100在A-A线处的剖视图。中框20包括边框21和中板22。边框21呈环状,中板22固定于边框21的内 表面。边框21可以环绕在中板22的边缘一周。屏幕10可以借助透光盖板11固定于中框20上。具体的,透光盖板11可以固定于中框20的边框21或中板22上。
在一些实施例中,中板22为金属件。具体的,中板22可以采用结构强度和硬度较大的金属材料制成,以使中板22具有较大的结构强度,从而使得中板22能够起到稳定支撑的作用。示例性的,中板22的材质可以为铝合金、不锈钢等。在另一些实施例中,中板22也可以为塑料件。在此情况下,中板22的材质可以为亚克力(polymethyl methacrylate,PMMA)、聚碳酸酯(polycarbonate,PC)等。
边框21可以通过注塑工艺形成在中板22的边缘。具体的,边框21为塑料件。例如,边框21的材质可以为PMMA、PC等。这样,可以提高边框21与中板22的连接强度,且能降低中框20的加工成本。
可以理解的是,在其他实施例中,中框20也可以为一体成型件,或者中板22与边框21还可以通过胶粘、焊接、卡接等方式固定连接。请继续参阅图2,电路板30包括主电路板31和副电路板32。主电路板31和副电路板32均固定连接于中板22的背离屏幕10的一侧表面,且主电路板31和副电路板32间隔开设置。示例性的,主电路板31和副电路板32在Y轴方向上间隔开设置。
主电路板31用于集成控制芯片,该控制芯片例如可以为应用处理器(application processor,AP)、双倍数据率同步动态随机存取存储器(double data rate,DDR)以及通用存储器(universal flash storage,UFS)等。
副电路板32用于集成天线(比如5G天线)射频前端、通用串行总线(universal serial bus,USB)器件、振子等电子器件。边框21上对应USB器件的位置可以设置插口,充电器、耳机、数据线等配件可经由该插口与USB器件电连接,以实现电源、信号以及数据的传输。副电路板32与主电路板31电连接,以实现主电路板31与副电路板32之间的数据、信号传输。可以理解的是,在其他实施例中,电路板30也可以仅包括主电路板31,而不包括副电路板32。
电池40用于向显示屏12、电路板30等提供电量。请参阅图2和图3,电池40可以固定连接于中板22的背离屏幕10的一侧表面。示例性的,电池40可以设置于主电路板31和副电路板32之间。中板22的背离屏幕10的一侧表面设有装配槽221,电池40可以安装于该装配槽221内。这样,有利于减小电池40与中板22在Z轴方向上的叠加尺寸,有利于减小电子设备100的整体厚度。
背盖50形成电子设备100的壳体的一部分,用于保护电子设备100的内部的主电路板31、副电路板32、电池40等电子器件。也即是,电子设备100的壳体包括背盖50。请继续参阅图2和图3,背盖50位于中板22的远离屏幕10的一侧,且背盖50固定于中框20上。背盖50与中框20之间围成用于容纳主电路板31、副电路板32、电池40等的容纳腔。可选的,背盖50可以为2D背盖、2.5D背盖或3D背盖。
请参阅图4,图4为本申请一些实施例提供的背盖50的局部截面示意图。背盖50包括基材51和油墨层52。可以理解的是,图4以及下文相关附图仅示意性的示出了背盖50包括的一些叠层结构,这些叠层结构的实际厚度、实际构造不受图4以及下文各附图限定。此外,背盖50的叠层结构不限于基材51和油墨层52,在其他实施例中,背盖50除了包括基材51和油墨层52之外,还可以包括设置于基材51的背离52的一 侧表面的其他膜层,和/或设置于基材51与油墨层52之间的其他膜层。
其中,基材51可以为透明件。基材51包括相背对第一内表面511和第一外表面512。基材51的第一内表面511朝向中框。在一些实施例中,基材51可以为亚克力(polymethyl methacrylate,PMMA)板、聚碳酸酯(polycarbonate,PC)板、由亚克力板、聚碳酸酯板层叠设置形成的复合板、玻璃等。
油墨层52设置于基材51的第一内表面511所朝向的一侧。油墨层52可以用于装饰背盖50。油墨层52可以为具有单一颜色的油墨层52,也可以为具有特定装饰图案的油墨层52。
由于基材51为透明件,油墨层52可以透过基材51外露于基材51的第一外表面512,这样,用户可以从电子设备100的外部看到油墨层52,一方面能提高电子设备100的外观美观性,以满足用户对电子设备100外观的需求,另一方面,用户在使用电子设备100的过程中不会触碰到油墨层52,可以避免油墨层52被硬物刮伤,有利于提升背盖50和电子设备100的使用寿命。
可以理解的是,油墨层52可以包括一层或多层。油墨层52的材料可以包括主体树脂。主体树脂包括但不限于聚酯树脂。油墨层52可以通过丝印、转印等方式形成于基材51上。一些实施例中,为了提高油墨层52的可印刷性和印刷效果,油墨层52的材料还可以包括哑粉。具体的,哑粉可以包括沉淀法二氧化硅和膨润土。
请返回参阅图3,电子设备100还包括粘接结构60,粘接结构60连接于背盖50与中框20之间。具体的,粘接结构60连接于背盖50与中板22之间。这样,背盖50与中框20可以通过粘接结构60粘接。
具体的,在一些实施例中,请参阅图5,图5为本申请一些实施例提供的背盖50与粘接结构60的装配示意图。在该实施例中,粘接结构60包括压敏胶带61,压敏胶带61可以粘接在背盖50的内表面上,且压敏胶带61可以设置于背盖50内表面的边缘部位。具体的,压敏胶带61可以连接于背盖50的油墨层52与中框20之间。
其中,压敏胶带61是一种特殊类型的胶带,通过将一种特殊胶粘剂(压敏胶)涂于带状基材51上制成。压敏胶带61包括但不限于泡棉胶带(也可以称为泡棉压敏胶带)。
压敏胶带61可模切成型后可直接粘接在背盖50或中框20上,然后通过定位治具将背盖50与中框20装配在一起。使用压敏胶带61粘接背盖50与中框20的过程中,只要施加微小的压力就可以实现背盖50与中框20的粘接,不需要长时间或在大于160℃的温度下进行高温固化,装配方便,生产效率高且加工成本低。
但是,压敏胶带61的粘接强度较弱,压敏胶带61与背盖50之间的剪切强度以及压敏胶带61与中框20之间的剪切强度一般不超过1.3MPa,使得背盖50与中框20之间的连接可靠性较差,在对电子设备100进行滚筒跌落等机械可靠性测试时,背盖50与中框20容易发生分离,无法保证电子设备100的结构稳定性。另外,压敏胶带61的可模切宽度较宽,通常为0.8mm以上,否则无法保证压敏胶带61的模切良率。因此,背盖50与中框之间的粘接面积大,不利于实现电子设备100的轻薄化设计,且限制了电子设备100内部的电池40、电路板30等器件的装配空间的进一步增大,不利于实现电子设备100续航能力的提高和性能的优化。
需要说明的是,本申请中所述的“粘接强度”是指在外力作用下,使粘接结构60(例如压敏胶带61、热熔胶62以及下文中提及的紫外光固化胶带层等)与被粘物界面或其邻近处发生破坏所需要的应力。粘接强度又称为胶接强度。剪切强度是粘接强度的其中一种表征方式。剪切强度,也可以称为动态剪切强度、搭接剪切强度等,是指在平行于粘接面方向的外力作用下,使粘接结构60(例如压敏胶带61、热熔胶62、紫外光固化胶带层等)与被粘物界面或其邻近处发生破坏所需要的应力。剪切强度可参照GB/T 33332-2016《胶粘带动态剪切强度的试验方法》进行测试。
一些实施例中,为了提高背盖50与中框20之间的连接可靠性,请参阅图6,图6为本申请另一些实施例提供的背盖50与粘接结构60的装配示意图。在该实施例中,粘接结构60除了包括压敏胶带61之外,还包括热熔胶62。在此情况下,背盖50与中框20之间可以通过热熔胶62以及压敏胶带61粘接连接。可以理解的是,其他实施例中,粘接结构60还可以仅包括热熔胶62,而不包括压敏胶带61。
其中,热熔胶62(polyurethane reactive,PUR)的全称为湿气固化反应型聚氨酯热熔胶62,主要成分是端异氰酸酯聚氨酯预聚体。由于热熔胶62的粘接强度较强,热熔胶62与背盖50之间的剪切强度以及热熔胶62与中框20之间的剪切强度可达14Mpa以上。
这样,通过在背盖50与中框20之间设置热熔胶62,可以提高背盖50与中框20之间的连接强度,能提高背盖50与中框20之间的连接可靠性。但是,由于热熔胶62需通过点胶工艺设置于背盖50和/或中框20上,装配工艺复杂,加工成本高。并且,热熔胶62与背盖50之间的剪切强度较大,在热熔胶62的使用量较大时,当电子设备100跌落或者返修过程中需拆卸背盖50时,背盖50上的油墨层52容易被热熔胶62拉掉,油墨层52存在脱落的风险,很容易损坏背盖50的外观。
为了能在提高背盖50与中框20之间连接可靠性的基础上,简化背盖50与中框20之间的装配工艺,降低背盖50与中框20的装配难度,请参阅图7,图7为本申请又一些实施例提供的电子设备100的剖视图。本实施例的电子设备100中,粘接结构60包括紫外光固化胶带层63,背盖50与中框20通过紫外光(ultraviolet,UV)固化胶带层63粘接固定。具体的,紫外光固化胶带层63连接于油墨层52和中框20之间。
紫外光固化胶带层63可由紫外光固化胶带经光固化处理形成。“光固化处理”是利用紫外光的中、短波(300纳米~800纳米),在紫外光辐射下,材料中的光引发剂受刺激变为自由基或阳离子,从而引发含活性官能团的高分子材料(树脂)聚合成固体涂膜的过程。
紫外光固化胶带为具有初粘性的一种胶带,经紫外光照射激活后,可发生固化形成紫外光固化胶带层63。也即是,紫外光固化胶带层63为固化后的紫外光固化胶带。
紫外光固化胶带层63与背盖50的油墨层52之间的剪切强度大于或等于1.5Mpa,且紫外光固化胶带层63与中框20之间的剪切强度大于或等于1.5Mpa。示例性的,紫外光固化胶带层63与油墨层52之间的剪切强度可以为1.5MPa、1.6MPa、1.8MPa、2MPa、2.5MPa、3MPa、3.5MPa、4MPa、4.5MPa、5MPa、5.5MPa、6MPa、6.5MPa、7MPa等。紫外光固化胶带层63与中框20之间的剪切强度可以为1.5MPa、1.6MPa、1.8MPa、2MPa、2.5MPa、3MPa、3.5MPa、4MPa、4.5MPa、5MPa、5.5MPa、6MPa、 6.5MPa、7MPa、8MPa、9MPa、10MPa、11MPa、12MPa等。可以理解的是,紫外光固化胶带层63、油墨层52之间的剪切强度与紫外光固化胶带层63、中框20之间的剪切强度,可以相同,也可以不同。
在装配时,可以将未经光固化处理的紫外光固化胶带设置在背盖50的朝向中框20的一侧表面(也即是背盖50的内表面)上,或者将未经光固化处理的紫外光固化胶带设置在中框20的朝向背盖50的一侧表面上,采用紫外光对背盖50或中框20上设有紫外光固化胶带的位置进行照射,对紫外光固化胶带进行紫外光激活,随后借助光激活后的紫外光固化胶带实现背盖50与中框20的粘接,接着借助保压治具对贴合在一起的背盖50与中框20进行快速保压,在保压过程中,紫外光固化胶带发生固化,形成紫外光固化胶带层63,实现背盖50与中框20之间的粘接固定。
其中,保压时间可以为60s~120s。示例性的,保压时间可以为60s、65s、70s、75s、80s、85s、90s、95s、100s、105s、110s、115s、120s等。
本申请中的电子设备100,通过紫外光固化胶带层63粘接固定背盖50和中框20,在装配过程中,只需对未经光固化处理的紫外光固化胶带进行紫外光激活,并对背盖50与中框20进行压合处理,即可实现背盖50与中框20之间的组装,工艺简单、加工效率高且成本低。并且,紫外光固化胶带层63和紫外光固化胶带相对于压敏胶带61和热熔胶62来说,更易清洁,不会出现残留,可提高返修良率。与此同时,本申请中的电子设备100,通过将紫外光固化胶带层63与背盖50的油墨层52之间的剪切强度设置为大于或等于1.5Mpa,紫外光固化胶带层63与中框20之间的剪切强度设置为大于或等于1.5Mpa,能够保证紫外光固化胶带层63与油墨层52、中框20之间的粘接强度,从而能保证背盖50与中框20之间的粘接强度,以提高背盖50与中框20之间的连接可靠性,在电子设备100跌落或被撞击的场景中,能降低背盖50和中框20分离的风险。
这样一来,本申请中的电子设备100,能在提高背盖50与中框20之间连接可靠性的基础上,简化背盖50与中框20之间的装配工艺,降低背盖50与中框20的装配难度,从而能降低电子设备100的加工成本。
在一些实施例中,紫外光固化胶带层63与背盖50的油墨层52之间的剪切强度小于或等于7Mpa。也即是,紫外光固化胶带层63与背盖50的油墨层52之间的剪切强度的范围为1.5MPa~7MPa。这样,可以使得紫外光固化胶带层63与油墨层52之间的粘接强度和抗冲击能力适中,一方面能保证背盖50与中框20之间的连接可靠性,能有效地降低电子设备100跌落或被撞击时,背盖50与中框20分离的风险;另一方面,在电子设备100跌落或者在电子设备100返修过程中拆卸背盖50时,可以避免紫外光固化胶带层63将背盖50上的油墨层52拉掉,从而能有效地降低油墨层52脱落的风险,有利于延长电子设备100的使用寿命。
在一些实施例中,紫外光固化胶带层63与中框20之间的剪切强度小于或等于7Mpa。也即是,紫外光固化胶带层63与中框20之间的剪切强度的范围为1.5MPa~7MPa。这样,一方面,可以降低背盖50与中框20之间的拆卸难度,在电子设备100返修过程中,便于将背盖50从中框20上拆卸下来,有利于提高返修效率,缩短返修时间。另一方面,可以减小紫外光固化胶带层63与背盖50之间的剪切强度、紫外光固化胶 带层63与中框20之间的剪切强度二者的差值,能使得紫外光固化胶带层63与背盖50、中框20之间的粘接强度大体平衡,进而能提高紫外光固化胶带层63的受力均匀性,有利于提高电子设备100的整体结构稳定性。
在上述任一实施例的基础上,为了进一步降低电子设备100的装配难度,提高电子设备100的装配良率,紫外光固化胶带与背盖50的油墨层52之间的初粘性大于或等于0.2N/mm。示例性的,紫外光固化胶带与背盖50的油墨层52之间的初粘性可以为0.2N/mm、0.3N/mm、0.4N/mm、0.5N/mm、0.6N/mm、0.7N/mm、0.8N/mm、0.9N/mm、1.0N/mm。其中,本申请实施例中的初粘性是指:在未对紫外光固化胶带进行紫外光固化处理时,紫外光固化胶带的粘接面与物体之间以微小压力发生短暂接触时,紫外光固化胶带对物体的粘附作用。初粘性的大小可以参照GB/T 4852-2002《压敏胶粘带初粘性试验方法(滚球法)》进行测试。
这样,可以保证未经光固化处理的紫外光固化胶带与背盖50之间的粘接强度,可以避免未经光固化处理的紫外光固化胶带从背盖50上滑脱,能提高未经光固化处理的紫外光固化胶带与背盖50之间的定位可靠性,进而能降低背盖50与中框20的装配难度,提高电子设备100的装配良率。
进一步的,紫外光固化胶带与背盖50的油墨层52之间的初粘性小于或等于1.0N/mm。这样,能降低紫外光固化胶带的加工难度,能降低紫外光固化胶带的加工成本,进而能降低电子设备100的整体成本。
在一些实施例中,紫外光固化胶带与中框20之间的初粘性也可以大于或等于0.2N/mm。进一步的,紫外光固化胶带与中框20之间的初粘性小于或等于1.0N/mm。
在一些实施例中,紫外光固化胶带的可模切宽度小于0.8mm。进一步的,紫外光固化胶带的可模切宽度小于或等于0.5mm。其中,紫外光固化胶带的可模切宽度是指,在未对紫外光固化胶带进行光固化处理时,紫外光固化胶带的模切宽度。
这样,在实际应用时,可以根据实际需要对紫外光固化胶带进行模切,将紫外光固化胶带模切至所需要的宽度。由于紫外光固化胶带的可模切宽度小,能够满足不同粘接部位对紫外光固化胶带层63的宽度不同需求,可使得中框20与背盖50之间的粘接更加灵活,便于电子设备100内部器件的装配,且有利于增大电子设备100的电池40、电路板30等器件的装配空间。
在一些实施例中,请参阅图7,至少部分紫外光固化胶带层63的宽度w小于0.8mm。也即是,其中一部分紫外光固化胶带层63的宽度可以小于0.8mm,或者所有紫外光固化胶带层63的宽度均小于0.8mm。进一步的,至少部分紫外光固化胶带层63的宽度w可以小于或等于0.5mm。这样,有利于减小背盖50与中框20之间的粘接面积,从而能在不增大电子设备100整体体积的基础上,增大电池40、电路板30等器件的装配空间,有利于增大电池40、电路板30等器件的体积,从而有利于提高电子设备100的续航能力,且有利于拓展电子设备100的功能,实现电子设备100性能的优化。此外,还有利于减小电子设备100的体积,实现电子设备100的轻薄化设计。
进一步的,至少部分紫外光固化胶带层63的宽度w大于或等于0.25mm且小于或等于0.5mm。示例性的,至少部分紫外光固化胶带层63的宽度w可以为0.25mm、0.3mm、0.35mm、0.4mm、0.45mm、0.5mm等。这样,能在保证背盖50与中框20之间的粘接 强度的同时,减小背盖50与中框20之间的粘接面积,从而能在不增大电子设备100整体体积的基础上,增大电池40、电路板30等器件的装配空间,有利于增大电池40、电路板30等器件的体积,从而有利于提高电子设备100的续航能力,且有利于拓展电子设备100的功能,实现电子设备100性能的优化。此外,还有利于减小电子设备100的体积,实现电子设备100的轻薄化设计。
在一些实施例中,请参阅图7,紫外光固化胶带层63的厚度t大于或等于0.15mm且小于或等于0.45mm。示例性的,紫外光固化胶带层63的厚度可以为0.15mm、0.2mm、0.25mm、0.3mm、0.35mm、0.38mm、0.4mm、0.42mm、0.45mm等。其中,紫外光固化胶带层63的厚度方向与电子设备100的厚度方向平行,也即是,紫外光固化胶带层63的厚度与Z轴方向平行。
这样,一方面便于通过紫外光对紫外光固化胶带进行光激活,能保证背盖50与中框20之间的连接强度,提高电子设备100的抗跌落能力;另一方面能减小中框20、紫外光固化胶带层63、背盖50在电子设备100厚度方向(也即是Z轴方向)上的尺寸;再一方面,紫外光固化胶带层63可以有效地吸收背盖50以及中框20的制造平面度问题,能提高背盖50与中框20之间的装配良率。
请参阅图8,图8为本申请一些实施例提供的紫外光固化胶带630的叠层结构示意图。紫外光固化胶带630固化后可以形成紫外光固化胶带层63。紫外光固化胶带630包括基体631、第一胶膜632和第二胶膜633。基体631包括相背对的第一表面631a和第二表面631b,第一胶膜632设置于第一表面631a,第二胶膜633设置于第二表面631b。第一胶膜632可以用于与背盖50粘接固定,第二胶膜633可以用于与中框20粘接固定。第一胶膜632和第二胶膜633均包括紫外光固化组合物。具体的,第一胶膜632固化后与背盖50粘接固定,第二胶膜633固化后与中框20粘接固定。
该实施例中的紫外光固化胶带630的结构简单,加工方便,并且可以根据中框20与背盖50的材质调整第一胶膜632中紫外光固化组合物以及第二胶膜633中紫外光固化组合物,使得固化后的第一胶膜632与背盖50的油墨层52之间的剪切强度以及固化后的第二胶膜633与中框20之间的剪切强度适中。
其中,紫外光固化胶带630的厚度可以与紫外光固化胶带层63的厚度相同。
在一些实施例中,第一胶膜632中的紫外光固化组合物可以与第二胶膜633中的紫外光固化组合物相同。在本实施例中,以第一胶膜632的紫外光固化组合物为例进行说明。
具体的,紫外光固化组合物包括丙烯酸类聚合物、可固化成分和光碱引发剂。其中,丙烯酸类聚合物可以包括(甲基)丙烯酸类聚合物。可固化成分包括多官能度硫醇和多官能度环氧树脂。在紫外光照射下,紫外光固化组合物中的光碱引发剂可以产生碱性催化剂,催化紫外光固化组合物中的可固化成分反应,进而提高紫外光固化胶带层63与粘接界面的粘接强度。
本申请实施例中的多官能度硫醇是指,分子中具有两个以上巯基(硫醇基)的化合物。多官能度硫醇可以包括:三羟甲基丙烷三硫代丙酸酯、季戊四醇四硫代丙酸酯、双巯基乙酸乙二醇酯、1,4-丁二醇双巯基乙酸酯、三羟甲基丙烷三巯基乙酸酯、季戊四醇四巯基乙酸酯、二(2-巯基乙基)醚、1,4-丁二硫醇、1,5-二巯基-3-硫杂戊烷、1,8-二巯 基-3,6-二氧杂辛烷、1,3,5-三巯基甲基苯、4,4’-二巯基二苯硫醚、1,3,5-三巯基甲基-2,4,6-三甲基苯、2,4,6-三巯基-s-三嗪、2-二丁基氨基-4,6-二巯基-s-三嗪、季戊四醇四(3-巯基丙酸酯)、二季戊四醇六-3-巯基丙酸酯、含末端硫醇基的聚醚、含末端硫醇基的聚硫醚、通过环氧化合物与硫化氢的反应而得到的硫醇化合物、通过聚硫醇化合物与环氧化合物的反应而得到的具有末端硫醇基的硫醇化合物等,但并不仅限于这些。
多官能度环氧树脂是指平均每个分子中具有两个以上环氧基的环氧树脂。多官能度环氧树脂包括但不限于醚化多官能度酚的缩水甘油醚类、环氧化多官能度胺的缩水甘油胺类以及酯化多官能度酸的缩水甘油酯类、脂环族环氧、环氧化(聚)烯烃等。
光碱引发剂是一类在光的照射下可产生碱性物质的化合物。光碱引发剂可以包括钴氨络合物类、肟基酯类、季铵盐类、硼酸盐类中的至少一种。本申请实施例中的光碱引发剂通过产生碱性催化剂来催化固化反应进行,其固化不像光酸固化那样容易受到湿气和碱性物质的影响,不会对金属基材表面造成腐蚀,并且其固化效率高,少量的光碱引发剂即能够催化交联反应的进行,达到半结构胶或结构胶的强度。
在一些实施中,为了提高紫外光固化胶带层63与背盖50的油墨层52之间的剪切强度,丙烯酸类聚合物的单体包括含有羟基官能团的丙烯酰类单体。丙烯酰类单体指的是在分子中含有丙烯酰基的单体。示例性的,丙烯酸类聚合物的单体可以包括丙烯酸羟基烷基酯类,例如丙烯酸羟基甲基酯、丙烯酸羟基乙基酯、丙烯酸羟基丙基酯、丙烯酸羟基丁基酯、甲基丙烯酸羟基甲基酯、甲基丙烯酸羟基乙基酯、甲基丙烯酸羟基丙基酯、甲基丙烯酸羟基丁基酯等。
羟基官能团与油墨层52中的主体树脂、哑粉等材料具有良好的润湿性,丙烯酸类聚合物的单体包括含有羟基官能团的丙烯酰类单体时,可以提高紫外光固化组合物与油墨层52之间的润湿性,进而能提高紫外光固化胶带层63与背盖50之间的剪切强度,使得紫外光固化胶带层63不仅能适用于金属、PC、PMMA等界面的粘接,还能适用于包括油墨层52的界面的粘接,使得紫外光固化胶带层63能适用于多种不同材料界面的粘接。
在上述实施例的基础上,为了进一步提高紫外光固化胶带层63与包括油墨层52的背盖50之间的粘接强度,紫外光固化胶带层63中,丙烯酸类聚合物的质量与紫外光固化组合物的质量的比值大于或等于60%。也即是,紫外光固化胶带固化后,丙烯酸类聚合物的质量分数大于或等于60%。示例性的,紫外光固化胶带层63中,丙烯酸类聚合物的质量分数可以为60%、62%、65%、68%、70%、72%、75%、78%、80%等。
这样,通过将紫外光固化胶带层63中丙烯酸类聚合物的质量分数设置为大于或等于60%,一方面能将紫外光固化胶带层63与背盖50的油墨层52之间的剪切强度控制为1.5MPa~7MPa之间,能在显著提升紫外光固化胶带层63与油墨层52的粘接强度的同时,避免电子设备100在跌落或者在电子设备100返修过程中拆卸背盖50的场景中,紫外光固化胶带层63将背盖50上的油墨层52拉掉,从而能有效地降低油墨层52脱落的风险,有利于延长电子设备100的使用寿命;另一方面,可以显著提升紫外光固化胶带630的初粘性的大小,从而能提升紫外光固化胶带的定位性能。
在一些实施例中,为了便于对紫外光固化胶带630进行紫外光激活,基体631的 透光率大于或等于92%。示例性的,基体631的透光率可以为92%、93%、94%、95%、96%、97%、98%、99%等。这样,将紫外光固化胶带630设置到背盖50上时,第二胶膜633可以外露,紫外光可以直接对第二胶膜633进行激活,且紫外光可以透过基体631对第一胶膜632进行激活。同样的,将紫外光固化胶带630设置到中框20上时,第一胶膜632可以外露,紫外光可以直接对第一胶膜632进行激活,且紫外光可以透过基体631对第二胶膜633进行激活。
在一些实施例中,基体631为透明塑料件。基体631的材质可以包括聚对苯二甲酸乙二醇酯(polyethylene terephthalate,PET)、亚克力(polymethyl methacrylate,PMMA)、聚碳酸酯(polycarbonate,PC)中的至少一种。也即是,基体631的材质可以包括PET、PMMA、PC中的其中一种。或者基体631的材质可以包括PET、PMMA、PC中的其中两种,或者基体631的材质可以包括PET、PMMA、PC。这些材料的透光性好,且价格低廉,容易获得。
可以理解的是,在其他实施例中,请参阅图9,图9为本申请另一些实施例提供的紫外光固化胶带630的结构示意图。紫外光固化胶带630也可以不包括基体631,在此情况下,紫外光固化胶带630可以仅包括第一胶膜632。也即是,紫外光固化胶带层63为无基体胶膜。可以理解的是,在其他实施例中,紫外光固化胶带630也可以仅包括第二胶膜633。
具体的,请参阅图9,第一胶膜632包括第一粘接面63a和第二粘接面63b,第一粘接面63a可以与背盖50粘接,第二粘接面63b可以与中框20粘接。这样,同样可以实现中框20与背盖50之间的粘接固定,且紫外光固化胶带630的结构简单,加工方便。
本申请实施例中的电子设备100,中框20与背盖50借助紫外光固化胶带层63粘接固定,一方面,紫外光固化胶带层63可以适应多种界面的粘接,且粘接强度明显优于压敏胶带61,能降低用户在跌落和撞击场景中背盖50和中框20分离的风险。另一方面,紫外光固化胶带层63与背盖50、中框20之间的粘接强度和抗冲击能力适中,不会出现由于粘接强度过高导致的油墨层52脱落的问题。再一方面,相对于压敏胶带61粘接的方案、热熔胶62点胶粘接方案、压敏胶带61与热熔胶62结合的粘接方案,通过紫外光固化胶带层63粘接的方案,电子设备100的组装加工效率高,成本低,且紫外光固化胶带层63以及用于形成紫外光固化胶带层63的紫外光固化胶带630更易清洁,不会出现残留或溢胶问题,可提高返修良率。又一方面,用于形成紫外光固化胶带层63的紫外光固化胶带630的可模切宽度小,可达到小于或等于0.5mm,能满足电子设备100对紫外光固化胶带层63的宽度的要求,有利于增大电子设备的电池40、电路板30等器件的安装空间,且有利于实现电子设备100的轻薄化设计。
本申请实施例还提供一种电子设备100的装配方法。本实施例中的电子设备100可以为上述任一实施例中的电子设备100。
请参阅图10,图10为本申请一些实施例提供的电子设备的装配方法的流程图。电子设备的装配方法包括:
步骤S100:提供第一结构件,第一结构件包括第一粘接区域;
步骤S200:将未固化的紫外光固化胶带设置在第一结构件的第一粘接区域;
步骤S300:对设有紫外光固化胶带的第一粘接区域进行紫外光照射,以激活紫外光固化胶带;
步骤S400:提供第二结构件,第二结构件包括第二粘接区域,将第二结构件设置在第一结构件的一侧,并使紫外光固化胶带连接于第一粘接区域和第二粘接区域之间,形成第一坯件;
步骤S500:对第一坯件进行保压处理预设时长,紫外光固化胶带形成紫外光固化胶带层。具体的,在对第一坯件进行保压处理过程中,紫外光固化胶带可以发生固化,形成紫外光固化胶带层。
在一些实施例中,紫外光固化胶带层与第一粘接区域之间的剪切强度大于或等于1.5Mpa,且紫外光固化胶带层与第二粘接区域之间的剪切强度大于或等于1.5Mpa。这样,可以保证紫外光固化胶带层与第一粘接区域、第二粘接区域之间的粘接强度,进而能保证第一结构件与第二结构件之间的连接可靠性。
其中,在一些实施例中,第一结构件包括背盖,且第二结构件包括中框,在此情况下,第一粘接区域位于背盖的油墨层上,第二粘接区域位于中框上。在另一些实施例中,也可以是第一结构件包括中框,且第二结构件包括背盖。在此情况下,第一粘接区域位于中框上,第二粘接区域位于背盖的油墨层上。
可以理解的是,包括中框的结构件,还可以包括设置于中框上的电池、电路板等。当然,可以理解的是,在其他实施例中,包括中框的结构件,也可以仅包括中框,而不包括其他器件。
本申请中的电子设备的装配方法,在装配过程中,只需对未固化的紫外光固化胶带进行光激活,并对第一结构件与第二结构件进行压合处理,即可实现第一结构件与第二结构件之间的组装,工艺简单、加工效率高且成本低。并且,紫外光固化胶带固化后,形成紫外光固化胶带层,能保证第一结构件和第二结构件之间的连接强度,从而能保证背盖与中框之间的粘接强度,以提高背盖与中框之间的连接可靠性,在电子设备跌落或被撞击的场景中,能降低背盖和中框分离的风险。此外,紫外光固化胶带层和紫外光固化胶带相对于压敏胶带和热熔胶来说,更易清洁,不会出现残留,可提高电子设备的返修良率。
在一些实施例中,紫外光固化胶带与第一粘接区域之间的初粘性大于或等于0.2N/mm。具体的,当第一粘接区域位于油墨层上时,紫外光固化胶带与油墨层之间的初粘性大于或等于0.2N/mm。当第一粘接区域位于中框上时,紫外光固化胶带与中框之间的初粘性大于或等于0.2N/mm。这样,可以保证未固化的紫外光固化胶带与第一粘接区域之间的粘接强度,可以避免未固化的紫外光固化胶带从第一粘接区域上滑脱,能提高未固化的紫外光固化胶带与第一结构件之间的定位可靠性,进而能降低电子设备的装配难度,有利于提高电子设备的装配良率。
紫外光固化胶带的叠层结构、厚度、可模切宽度、紫外光固化组合物可以参考上述任一实施例中的紫外光固化胶带进行设计,在此不再详细描述。
在一些实施例中,对第一坯件进行保压处理预设时长包括:采用保压治具对第一坯件进行保压处理60s~120s。示例性的,保压时间可以为60s、65s、70s、75s、80s、85s、90s、95s、100s、105s、110s、115s、120s等。这样,能在保证第一结构件与第 二结构件之间的粘接强度的同时,缩短电子设备的整体装配时间,有利于提高电子设备的装配效率。
以下结合具体实施例对包括电子设备100的装配方法进行详细描述。
实施例1
请参阅图11,图11为本申请一些实施例提供的电子设备100的装配方法的流程示意图。电子设备100的装配方法包括:
步骤S100a:提供第一结构件,第一结构件包括背盖50,背盖50包括油墨层52,油墨层52上设有第一粘接区域501;
油墨层的材料包括主体树脂和哑粉。第一粘接区域501位于背盖50的边缘部位。可选的,第一粘接区域501呈环形。
步骤S200a:将紫外光固化胶带630设置在油墨层52上的第一粘接区域501;
本实施例中固定紫外光固化胶带630为无基体胶膜。
步骤S300a:对设有紫外光固化胶带630的第一粘接区域501进行紫外光照射,以激活紫外光固化胶带630;
步骤S400a:提供第二结构件,第二结构件包括中框20,中框20上设有第二粘接区域,将第二结构件设置在第一结构件的一侧,并使紫外光固化胶带630连接于第一粘接区域501和第二粘接区域之间,形成第一坯件;然后采用保压治具对第一坯件进行保压处理90s。
可以理解的是,步骤S400a中的紫外光固化胶带630是经紫外光照射激活后的紫外光固化胶带630。
在一些实施例中,在将第二结构件设置在第一结构件的一侧之前,还包括:将电池、电路、屏幕等器件装配在中框上。
请参阅图12,图12为图11中所示流程示意图中A部区域的放大图。紫外光固化胶带层63(也即是固化后的紫外光固化胶带)连接于中框20与背盖50之间,屏幕10连接于中框20的背离背盖50的一侧。
该电子设备100的性能见表1。
对比例1
电子设备的装配方法包括:
步骤S100b:提供第一结构件,第一结构件包括背盖,背盖包括油墨层,油墨层上设有第一粘接区域;
步骤S200b:将压敏胶带设置在油墨层上的第一粘接区域;
步骤S300b:提供第二结构件,第二结构件包括中框,中框上设有第二粘接区域,将第二结构件设置在第一结构件的背离压敏胶带的一侧,并使压敏胶带连接于第一粘接区域和第二粘接区域之间,形成第二坯件,然后采用保压治具对第二坯件进行保压处理。
该电子设备的性能见表1。
表1
由表1可知,实施例1中,电子设备的中框与背盖之间的粘接结构为紫外光固化胶带层,紫外光固化胶带层的厚度为0.3mm,在未对紫外光固化胶带进行紫外光固化时,紫外光固化胶带与油墨层之间的初粘性为0.35N/mm,紫外光固化胶带层的紫外光固化组合物中,丙烯酸类聚合物的质量分数为60%,且丙烯酸类聚合物的单体包括含有羟基官能团的丙烯酰类单体。
实施例1中的电子设备,背盖与中框之间具有较强的连接可靠性,且该电子设备在滚筒跌落性能测试中表现出优异的抗跌落性能。具体的,背盖的油墨层与紫外光固化胶带层之间的剪切强度为3.58MPa,电子设备在滚筒跌落性能测试中,跌落次数达到2000次时,背盖与中框未出现分离。
其中,紫外光固化胶带与油墨层之间的初粘性大小可以参照GB/T4852-2002《压敏胶粘带初粘性试验方法(滚球法)》进行测试。背盖与紫外光固化胶带层之间的剪切强度可以参照GB/T 33332-2016《胶粘带动态剪切强度的试验方法》进行测试。滚筒跌落测试是通过滚筒跌落试验机对电子设备整机进行连续回转下落测试,通过计数器所设定次数达到后,取出电子设备整机,评估电子设备整机耐回转跌落的能力。
对比例1中,电子设备的中框与背盖之间的粘接结构为压敏胶带,压敏胶带的厚度为0.3mm、宽度为0.8mm。对比例1中的电子设备,背盖与中框之间连接可靠性较差,且该电子设备在滚筒跌落性能测试中的表现较差。具体的,背盖与压敏胶带之间的剪切强度为1.1MPa,电子设备在滚筒跌落性能测试中,跌落次数达到450次时,背盖与中框出现分离。
综上可知,采用紫外光固化胶带层粘接背盖与中框时,能提升中框与背盖之间的连接可靠性,提升电子设备的抗冲击性能,在电子设备跌落时,能有效地避免背盖与中框分离。
在本说明书的描述中,具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
最后应说明的是:以上实施例仅用以说明本申请的技术方案,而非对其限制;尽管参照前述实施例对本申请进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (27)

  1. 一种电子设备,其特征在于,包括:
    中框;
    背盖,所述背盖设在所述中框的一侧,所述背盖包括基材和油墨层,所述油墨层设置于所述基材的朝向所述中框的一侧表面;
    紫外光固化胶带层,所述背盖与所述中框通过所述紫外光固化胶带层粘接固定,所述紫外光固化胶带层连接于所述油墨层与所述中框之间,所述紫外光固化胶带层与所述油墨层之间的剪切强度大于或等于1.5MPa,且所述紫外光固化胶带层与所述中框之间的剪切强度大于或等于1.5MPa。
  2. 根据权利要求1所述的电子设备,其特征在于,所述紫外光固化胶带层与所述油墨层之间的剪切强度小于或等于7MPa。
  3. 根据权利要求1所述的电子设备,其特征在于,所述紫外光固化胶带层与所述中框之间的剪切强度小于或等于7MPa。
  4. 根据权利要求1所述的电子设备,其特征在于,至少部分所述紫外光固化胶带层的宽度小于0.8mm。
  5. 根据权利要求1所述的电子设备,其特征在于,至少部分所述紫外光固化胶带层的宽度大于或等于0.25mm且小于或等于0.5mm。
  6. 根据权利要求1所述的电子设备,其特征在于,所述紫外光固化胶带层的厚度大于或等于0.15mm且小于或等于0.45mm。
  7. 根据权利要求1所述的电子设备,其特征在于,所述紫外光固化胶带层由紫外光固化胶带经光固化处理形成,所述紫外光固化胶带包括:
    基体,所述基体为透明件,所述基体包括相对的第一表面和第二表面,所述第一表面朝向所述背盖;
    第一胶膜,所述第一胶膜设置于所述基体的第一表面,所述第一胶膜用于与所述背盖粘接固定;
    第二胶膜,所述第二胶膜设置于所述基体的第二表面,所述第二胶膜用于与所述中框粘接固定,所述第一胶膜和所述第二胶膜均包括紫外光固化组合物。
  8. 根据权利要求7所述的电子设备,其特征在于,所述基体的透光率大于等于92%。
  9. 根据权利要求1所述的电子设备,其特征在于,所述紫外光固化胶带层由紫外光固化胶带经光固化处理形成,所述紫外光固化胶带包括:第一胶膜,所述第一胶膜包括紫外光固化组合物,所述第一胶膜包括相背对的第一粘接面和第二粘接面,所述第一粘接面用于与所述背盖粘接,所述第二粘接面用于与所述中框粘接。
  10. 根据权利要求7-9中任一项中所述的电子设备,其特征在于,所述紫外光固化组合物包括:
    丙烯酸类聚合物,所述丙烯酸类聚合物的单体包括含有羟基官能团的丙烯酰类单体;
    可固化成分,所述可固化成分包括多官能度硫醇和多官能度环氧树脂;和
    光碱引发剂。
  11. 根据权利要求10所述的电子设备,其特征在于,所述紫外光固化胶带层中,所述丙烯酸类聚合物的质量与所述紫外光固化组合物的质量的比值大于或等于60%。
  12. 根据权利要求1-9中任一项所述的电子设备,其特征在于,所述中框包括中板和边框,所述边框连接于所述中板的外边缘,所述紫外光固化胶带层连接于所述中板与所述背盖之间。
  13. 根据权利要求12所述的电子设备,其特征在于,所述中板为金属件、亚克力件或聚碳酸酯件。
  14. 一种根据权利要求1-13中任一项所述的电子设备的装配方法,其特征在于,包括:
    提供第一结构件,所述第一结构件包括第一粘接区域;
    将未固化的紫外光固化胶带设置在所述第一结构件的所述第一粘接区域;
    对设有所述紫外光固化胶带的所述第一粘接区域进行紫外光照射,以激活所述紫外光固化胶带;
    提供第二结构件,所述第二结构件包括第二粘接区域,将所述第二结构件设置在所述第一结构件的一侧,并使所述紫外光固化胶带连接于所述第一粘接区域和所述第二粘接区域之间,形成第一坯件;
    对所述第一坯件进行保压处理预设时长,所述紫外光固化胶带形成紫外光固化胶带层;
    其中,所述第一结构件包括所述背盖,且所述第二结构件包括所述中框,所述第一粘接区域位于所述背盖的油墨层上,所述第二粘接区域位于所述中框上;或者所述第一结构件包括中框,且所述第二结构件包括背盖,所述第一粘接区域位于所述中框上,所述第二粘接区域位于所述背盖的油墨层上。
  15. 根据权利要求14所述的电子设备的装配方法,其特征在于,对所述第一坯件进行保压处理预设时长包括:
    采用保压治具对所述第一坯件进行保压处理60s~120s。
  16. 根据权利要求14所述的电子设备的装配方法,其特征在于,所述紫外光固化胶带与所述第一粘接区域之间的初粘性大于或等于0.2N/mm。
  17. 根据权利要求14-16中任一项所述的电子设备的装配方法,其特征在于,所述紫外光固化胶带的可模切宽度小于或等于0.5mm。
  18. 一种电子设备,其特征在于,包括:
    中框;
    背盖,所述背盖设在所述中框的一侧,所述背盖包括基材和油墨层,所述油墨层设置于所述基材的朝向所述中框的一侧表面;
    紫外光固化胶带层,所述背盖与所述中框通过所述紫外光固化胶带层粘接固定,所述紫外光固化胶带层连接于所述油墨层与所述中框之间,所述紫外光固化胶带层包括紫外光固化组合物,所述紫外光固化组合物包括:丙烯酸类聚合物、可固化成分和光碱引发剂,所述丙烯酸类聚合物的单体包括含有羟基官能团的丙烯酰类单体,所述丙烯酸类聚合物的质量与所述紫外光固化组合物的质量的比值大于或等于60%且小于80%;所述可固化成分包括多官能度硫醇和多官能度环氧树脂;
    所述紫外光固化胶带层与所述油墨层之间的剪切强度大于或等于1.5MPa且小于或等于7MPa,且所述紫外光固化胶带层与所述中框之间的剪切强度大于或等于1.5MPa。
  19. 根据权利要求18所述的电子设备,其特征在于,所述紫外光固化胶带层与所述中框之间的剪切强度小于或等于7MPa。
  20. 根据权利要求18所述的电子设备,其特征在于,至少部分所述紫外光固化胶带层的宽度小于0.8mm。
  21. 根据权利要求18所述的电子设备,其特征在于,至少部分所述紫外光固化胶带层的宽度大于或等于0.25mm且小于或等于0.5mm。
  22. 根据权利要求18所述的电子设备,其特征在于,所述紫外光固化胶带层的厚度大于或等于0.15mm且小于或等于0.45mm。
  23. 根据权利要求18所述的电子设备,其特征在于,所述紫外光固化胶带层由紫外光固化胶带经光固化处理形成,所述紫外光固化胶带包括:
    基体,所述基体为透明件,所述基体包括相对的第一表面和第二表面,所述第一表面朝向所述背盖;
    第一胶膜,所述第一胶膜设置于所述基体的第一表面,所述第一胶膜用于与所述背盖粘接固定;
    第二胶膜,所述第二胶膜设置于所述基体的第二表面,所述第二胶膜用于与所述中框粘接固定,所述第一胶膜和所述第二胶膜均包括紫外光固化组合物。
  24. 根据权利要求23所述的电子设备,其特征在于,所述基体的透光率大于等于92%。
  25. 根据权利要求18所述的电子设备,其特征在于,所述紫外光固化胶带层由紫外光固化胶带经光固化处理形成,所述紫外光固化胶带包括:第一胶膜,所述第一胶膜包括紫外光固化组合物,所述第一胶膜包括相背对的第一粘接面和第二粘接面,所述第一粘接面用于与所述背盖粘接,所述第二粘接面用于与所述中框粘接。
  26. 根据权利要求18-25中任一项所述的电子设备,其特征在于,所述中框包括中板和边框,所述边框连接于所述中板的外边缘,所述紫外光固化胶带层连接于所述中板与所述背盖之间。
  27. 根据权利要求26所述的电子设备,其特征在于,所述中板为金属件、亚克力件或聚碳酸酯件。
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