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 PDFInfo
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- 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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- WIPO (PCT)
- Prior art keywords
- electronic device
- back cover
- curable
- middle frame
- tape
- Prior art date
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1656—Details 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/12—Bonding of a preformed macromolecular material to the same or other solid material such as metal, glass, leather, e.g. using adhesives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives 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
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/062—Copolymers with monomers not covered by C09J133/06
- C09J133/066—Copolymers with monomers not covered by C09J133/06 containing -OH groups
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL 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
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133314—Back frames
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL 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
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133317—Intermediate frames, e.g. between backlight housing and front frame
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL 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
- G02F1/00—Devices 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
- G02F1/01—Devices 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
- G02F1/13—Devices 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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133325—Assembling processes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/871—Self-supporting sealing arrangements
- H10K59/8722—Peripheral sealing arrangements, e.g. adhesives, sealants
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/416—Additional features of adhesives in the form of films or foils characterized by the presence of essential components use of irradiation
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2463/00—Presence of epoxy resin
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL 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
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive 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
Description
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。
Claims (27)
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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%。
- 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。
- 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。
- 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%。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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%。
- 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。
- 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。
- 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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| EP4503873A1 (en) | 2025-02-05 |
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| CN116017898A (zh) | 2023-04-25 |
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