WO2026014253A1 - Dispositif acoustique - Google Patents

Dispositif acoustique

Info

Publication number
WO2026014253A1
WO2026014253A1 PCT/JP2025/022994 JP2025022994W WO2026014253A1 WO 2026014253 A1 WO2026014253 A1 WO 2026014253A1 JP 2025022994 W JP2025022994 W JP 2025022994W WO 2026014253 A1 WO2026014253 A1 WO 2026014253A1
Authority
WO
WIPO (PCT)
Prior art keywords
diaphragm
piezoelectric
coil
acoustic device
housing
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.)
Pending
Application number
PCT/JP2025/022994
Other languages
English (en)
Japanese (ja)
Inventor
信之 永井
祐一 石田
融 宇高
美貴 遠藤
修大 北出
裕介 牟田
大介 川口
星弥 管原
和彦 宮原
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.)
Sony Group Corp
Original Assignee
Sony Group Corp
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 Sony Group Corp filed Critical Sony Group Corp
Publication of WO2026014253A1 publication Critical patent/WO2026014253A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers

Definitions

  • This technology relates to acoustic equipment having a piezoelectric coil.
  • voice coil motors have been disclosed as audio equipment, each comprising a cylindrical case with a bottom, a permanent magnet located at the bottom center of the inside of the case, and a coil section.
  • the purpose of this technology is to provide audio equipment that can be made lighter.
  • An acoustic device includes a housing, a diaphragm, and a piezoelectric coil.
  • the housing has an opening at one end in a first direction and a bottom at the other end in the first direction.
  • the diaphragm is supported within the housing.
  • the piezoelectric coil has a coil-shaped core material that connects the housing and the diaphragm, and a piezoelectric material that is wound spirally around the core material.
  • the piezoelectric coil may be arranged along the first direction, with a first end portion on one side in the first direction connected to the center of the diaphragm when viewed from the first direction, and a second end portion on the other side in the first direction connected to the housing.
  • the first end and the second end may be the core material.
  • the length of the core material in a second direction perpendicular to the first direction may be 40% or more and less than 100% of the length of the diaphragm in the second direction.
  • the length of the piezoelectric coil in the first direction may be 5% to 20% of the length of the diaphragm in a second direction perpendicular to the first direction.
  • the core material may connect the bottom and the diaphragm.
  • the housing further includes a support portion that faces the diaphragm in the first direction and is provided on one end side in the first direction,
  • the piezoelectric coil may be provided between the support portion and the diaphragm.
  • FIG. 10 is a diagram illustrating an acoustic device according to a first embodiment of the present technology
  • 1 is a diagram showing a piezoelectric coil according to a first embodiment of the present technology as viewed from above
  • FIG. 10 is a diagram illustrating an acoustic device according to a second embodiment of the present technology.
  • FIG. 10 is a top view of a piezoelectric coil according to a second embodiment of the present technology.
  • 10A and 10B are diagrams illustrating a piezoelectric coil diameter and a displacement amount according to a second embodiment of the present technology.
  • 10 is a diagram showing a piezoelectric coil length and a displacement amount according to a second embodiment of the present technology;
  • FIG. 10 is a diagram illustrating an acoustic device according to a third embodiment of the present technology.
  • FIG. 10 is a top view of a piezoelectric coil according to a third embodiment of the present technology.
  • FIG. 1 is a diagram showing an acoustic device 1 according to a first embodiment of the present technology
  • Fig. 2 is a diagram showing a piezoelectric coil 40 according to the first embodiment of the present technology as viewed from above.
  • an X-axis, a Y-axis, and a Z-axis indicate three axial directions that are orthogonal to one another.
  • the acoustic device 1 comprises a housing 10, a diaphragm 20, and a piezoelectric coil 40.
  • the acoustic device 1 is described as an earphone, but of course it is not limited to this and can also be applied to headphones, speakers, etc.
  • the housing 10 has an internal space W that houses the diaphragm 20 and the piezoelectric coil 40. As shown in Fig. 1, the housing 10 is cylindrical and has a bottom 10A that is open on the positive side (one end) of the Z axis (first direction) and a cylindrical side portion 10B that extends from the bottom 10A toward the positive side of the Z axis (the other end). The side portion 10B has an open end 101B that forms an opening on the positive side of the Z axis.
  • the housing 10 is cylindrical, but of course this is not limited to this.
  • the diaphragm 20 is supported within the housing 10 by a flexible material 30, which will be described later.
  • the diaphragm 20 (cone paper) is formed in a circular shape when viewed in the Z-axis direction.
  • “circular shape” refers not only to a circle but also to an approximately circular shape.
  • the outer diameter and thickness of the diaphragm 20 are not particularly limited and are set appropriately depending on the size of the housing 10, the frequency band, etc.
  • the diaphragm 20 is concave (cone-shaped) from its outer periphery toward its inner periphery.
  • the cone-shaped diaphragm 20 has a bottom plate portion 20A, to which the piezoelectric coil 40 is connected (adhered).
  • the diaphragm 20 is cone-shaped, but of course it is not limited to this and may also be disk-shaped.
  • the flexible material 30 is made of an elastomer material such as polyurethane, but is of course not limited to this. As shown in Figure 1, the flexible material 30 is adhered to the open end 101B of the housing 10 and the diaphragm 20.
  • the flexible material 30 may be bonded to the housing 10 and diaphragm 20 using, for example, an epoxy or silicone adhesive for elastomers, or if the flexible material 30 is a thermoplastic resin, it may be bonded by thermocompression bonding, or of course it may be bonded by other methods.
  • the piezoelectric coil 40 has a coil-shaped core material 40A that connects the housing 10 and the diaphragm 20, and a piezoelectric material 40B that is spirally wound in the length direction (Z-axis direction) of the core material 40A.
  • the piezoelectric coil 40 also has an electrode portion (not shown) that applies an electric field to the piezoelectric material 40B in the thickness direction of the piezoelectric material 40B.
  • the electrode portion is configured to be able to apply an electric field (DC or AC) to the piezoelectric material 40B in the thickness direction of the piezoelectric material 40B.
  • the electric field is applied in the thickness direction of the piezoelectric material 40B, but the electric field may also be applied in the length direction of the piezoelectric material 40B.
  • the piezoelectric material 40B distorts, and at this time, the expansion and contraction of the piezoelectric material 40B in the length direction contributes to the deformation of the piezoelectric coil 40 in the Z-axis direction.
  • the electrode portion has a core material 40A and a surface electrode (not shown) that sandwiches the piezoelectric material 40B between the core material 40A and the surface electrode in the thickness direction of the piezoelectric material 40B.
  • One of the core material 40A and the surface electrode is a positive electrode, and the other is a negative electrode.
  • the core material 40A is configured in the shape of a coil spring, and its cross section (a cross section perpendicular to the longitudinal direction of the core material 40A) is circular.
  • the cross section of the core material 40A may also be elliptical, polygonal, or other shapes, and the shape of this cross section is not particularly limited.
  • the core material 40A is made of at least one material selected from the group consisting of graphite, Mg alloy, Al, Ti, SUS, W, Au, Ag, Cu, Pt, and ceramics.
  • Piezoelectric material 40B is configured in a strip shape that is long in the length direction, short in the width direction, and thin in the thickness direction. Piezoelectric material 40B is wound around core material 40A at a predetermined angle in the length direction.
  • the piezoelectric material 40B is, for example, Pb(Zr,Ti)O3[PZT], PbTiO3, Pb(Mg1/3Nb2/3)O3-PbTi O3[PMN-PT], Pb(Zn1/3Nb2/3)O3-PbTiO3[PZN-PT], BaTiO3[BT], (K,N a) NbO3 [KNN], KNbO3, NaNbO3, (K, Na, Li) NbO3, (K, Na, Li) (Nb, Ta, Sb) O3, (Sr,Ba)Nb2O6, (Sr,Ca)NaNb5O15, (Na,K)Ba2NbO15, BiFeO3, Bi4T It is constructed using at least one material selected from the following base materials: i3O12, (Bi1/2K1/2)TiO3, (Bi1/2Na1/2)TiO3, BaTiO3-(Bi1/2K
  • the core material 40A is connected between the housing 10 and the diaphragm 20.
  • the core material 40A has a first end 401A that connects to the diaphragm 20 and a second end (not shown) that connects to the housing 10 (see Figure 2).
  • the first end 401A of the core material 40A is not covered by the piezoelectric material 40B. As described above, the first end 401A is connected to the bottom plate portion 20A of the diaphragm 20 using an adhesive or the like.
  • the adhesive used may be, for example, an ultraviolet-curing or moisture-curing adhesive, but is of course not limited to this. Furthermore, the use of an ultraviolet-curing resin can shorten the bonding time.
  • the second end of the core material 40A is connected to the bottom 10A of the housing 10 using adhesive, a jig, or the like.
  • the adhesive used may be, for example, an ultraviolet-curing or moisture-curing adhesive, but is of course not limited to this. Furthermore, using an ultraviolet-curing resin can shorten the bonding time.
  • the acoustic device 1 allows the acoustic device 1 to be made smaller and lighter.
  • magnets and coils were used to drive the diaphragm
  • the piezoelectric coil 40 exhibits large displacement from low to high frequencies, when used in the acoustic device 1, high sound pressure can be obtained over a wide frequency range.
  • the drive current can be made smaller than that of a voice coil motor, reducing power consumption.
  • the connection position between the first end 401A of the core material 40A and the bottom plate portion 20A of the diaphragm 20 is not particularly limited.
  • the first end 401A' of the core material 40A' may be connected to the center of the bottom plate portion 20A when viewed from the Z-axis direction.
  • FIG. 3 is a diagram showing an acoustic device 1A according to a second embodiment of the present technology
  • FIG. 4 is a top view of a piezoelectric coil 40' according to the second embodiment of the present technology.
  • FIG. 5 is a diagram showing the diameter and displacement of a piezoelectric coil according to the second embodiment of the present technology
  • FIG. 6 is a diagram showing the length and displacement of a piezoelectric coil according to the second embodiment of the present technology.
  • configurations different from the first embodiment will be mainly described, and configurations similar to those in the first embodiment will be denoted by the same reference numerals, and their description will be omitted or simplified.
  • the first end 401A' of the piezoelectric coil 40' of the acoustic device 1A' is connected to the center of the diaphragm 20 (bottom plate portion 20A) when viewed from the Z-axis direction, and the second end 402A' is connected to the bottom portion 10A at a position overlapping the first end 401A' when viewed from the Z-axis direction.
  • the piezoelectric coil 40' also has a fixed portion 40C.
  • the fixed portion 40C has a first fixed portion 401C that connects the first end 401A' to the diaphragm 20, and a second fixed portion 402C that connects the second end 402A' to the housing 10 (bottom portion 10A).
  • the first end 401A' is the core material 40A' and is provided so as to face the central portion of the diaphragm 20 when viewed in the Z-axis direction.
  • the central portion is not limited to the exact center of the diaphragm 20, but also includes the approximate center (substantially the center).
  • the first end 401A' which is not wrapped with piezoelectric material 40B', is bent from the piezoelectric coil 40', which is circular when viewed in the Z-axis direction, so as to face the central portion described above.
  • the first end 401A' is connected to the diaphragm 20 by the first fixing portion 401C described above.
  • the first fixing portion 401C for example, an ultraviolet-curing or moisture-curing adhesive is used, but of course it is not limited to this. Furthermore, by using an ultraviolet-curing resin, the bonding time can be shortened.
  • the second end 402A' is the core material 40A' and is arranged so as to face the central portion of the diaphragm 20 when viewed in the Z-axis direction. Furthermore, the second fixed portion 402C is arranged at a position overlapping the first fixed portion 401C when viewed in the Z-axis direction, and the second end 402A' is arranged so as to face the second fixed portion 402C. In other words, similar to the first end 401A', the second end 402A', which is not wound with piezoelectric material 40B', is bent from the piezoelectric coil 40', which is circular when viewed in the Z-axis direction, so as to face the central portion described above.
  • the second end 402A' is connected to the housing 10 (bottom 10A) by the second fixing portion 402C described above.
  • an ultraviolet-curing or moisture-curing adhesive is used for the second fixing portion 402C, but of course this is not limited to this and a jig or the like may also be used.
  • the diaphragm 20 to vibrate smoothly.
  • the connection positions of the first end 401A' and the second end 402A' are offset from the center position of the diaphragm 20 when viewed from the Z-axis direction, the diaphragm 20 will not vibrate parallel to the Z-axis direction and will tilt. This causes tilting and asymmetric deformation of the diaphragm 20, particularly at high frequencies.
  • the first end 401A' of the piezoelectric coil 40' is connected to the center of the diaphragm 20 (bottom plate portion 20A) when viewed from the Z-axis direction, and the second end 402A' is connected to the bottom portion 10A at a position overlapping with the first end 401A' when viewed from the Z-axis direction.
  • the piezoelectric coil 40' shown in Figure 5 has a core material 40A' made of a heat-resistant alloy, a piezoelectric material 40B made of PZT, and a coil length of 5 mm.
  • the horizontal axis of Figure 5 represents the ratio of the diameter of the piezoelectric coil 40' to the diameter of the diaphragm 20, and the vertical axis represents the displacement compared to a conventional product.
  • the piezoelectric coil 40' shown in Figure 4 is driven at 10 Hz.
  • the diameter of the diaphragm 20 is the diameter including the flexible material 30, which in this embodiment is 30 mm and is also the opening diameter of the housing 10.
  • the conventional product on the vertical axis is a voice coil motor, and the voice coil size is 30 mm in diameter and 5 mm in length.
  • the vibration of the diaphragm 20 can be increased.
  • the ratio of the diameter of the piezoelectric coil 40' to the diameter of the diaphragm 20 is 40% or more, it is possible to vibrate the diaphragm 20 with a sufficient displacement compared to conventional voice coil motors, thereby increasing the sound pressure. It is also preferable that the ratio of the diameter of the piezoelectric coil 40' to the diameter of the diaphragm 20 be 100% or less. The reason for this is that if it exceeds 100%, the diameter (size) of the entire acoustic device 1 becomes large (for miniaturization).
  • the piezoelectric coil 40' shown in Figure 6 has a core material 40A' made of a heat-resistant alloy, a piezoelectric material 40B made of PZT, and a coil diameter of 20 mm.
  • the horizontal axis of Figure 6 represents the ratio of the length of the piezoelectric coil 40' to the diameter of the diaphragm 20, and the vertical axis represents the displacement amount relative to a conventional product.
  • the diameter of the diaphragm 20 is the diameter including the flexible material 30, which in this embodiment is 30 mm and is also the opening diameter of the housing 10.
  • the conventional product on the vertical axis is a voice coil motor, and the voice coil size is 30 mm in diameter and 5 mm in length.
  • the absolute value of the displacement of the coil length increases.
  • the vibration of the diaphragm 20 can be increased.
  • the ratio of the length of the piezoelectric coil 40' to the diameter of the diaphragm 20 is 5% or more, it is possible to vibrate the diaphragm 20 with a sufficient displacement compared to conventional voice coil motors, thereby increasing the sound pressure. It is also preferable that the ratio of the length of the piezoelectric coil 40' to the diameter of the diaphragm 20 be 20% or less. This is because if it exceeds 20%, the overall length (size) of the acoustic device 1 becomes large (for miniaturization).
  • the piezoelectric coil is provided between the diaphragm 20 and the bottom 10A of the housing 10, but it may also be provided between the diaphragm 20 and the open end 101B of the housing 10.
  • Fig. 7 is a diagram showing an acoustic device 1B according to a third embodiment of the present technology
  • Fig. 8 is a top view of the piezoelectric coil 1B according to the third embodiment of the present technology.
  • the housing 10' of the acoustic device 1B further includes a support portion 10C that faces the diaphragm 20 in the Z-axis direction and is provided on one end side in the Z-axis direction.
  • the support portions 10C are columnar, and multiple support portions 10C are provided at the opening end 101B to divide the opening into multiple sections.
  • two support portions 10C are provided so as to intersect, but this is not limited to this; there may be one support portion, three or more support portions, or a mesh-like structure.
  • the support portion 10C is positioned so as to pass through the center of the diaphragm 20 when viewed in the Z-axis direction.
  • the support portion 10C is made of, for example, a metal such as aluminum or SUS, or a resin such as acrylic or PC.
  • the piezoelectric coil 40'' is provided between the vibration plate 20 and the support portion 10C described above.
  • the first end 401A'' of the piezoelectric coil 40'' is located at the center of the vibration plate 20 (bottom plate portion 20A) when viewed from the Z-axis direction and is connected to the support portion 10C, while the second end 402A'' is connected to the support portion 10C of the bottom portion 10A and is provided at a position overlapping the first end 401A'' when viewed from the Z-axis direction.
  • the first end 401A'' is the core material 40A'' and is arranged to face the center portion of the diaphragm 20 (the position where the support portion 10C intersects) when viewed in the Z-axis direction.
  • the first end 401A'' is connected to the support part 10C by a first fixing part 401C provided on the support part 10C.
  • a first fixing part 401C for example, an ultraviolet-curing or moisture-curing adhesive is used, but of course, this is not limited to this.
  • using an ultraviolet-curing resin can shorten the bonding time.
  • the first fixing part 401C is provided at an intersecting position of the support part 10C, but of course, this is not limited to this.
  • the second end 402A'' is the core material 40A'' and is arranged to face the center of the diaphragm 20 when viewed in the Z-axis direction. Furthermore, the second fixed portion 402C is arranged at a position overlapping the first fixed portion 401C when viewed in the Z-axis direction, and the second end 402A'' is arranged to face the second fixed portion 402C.
  • the second end 402A'' is connected to the diaphragm 20 by a second fixing portion 402C provided on the support portion 10C side of the bottom plate portion 20A of the diaphragm 20.
  • a second fixing portion 402C provided on the support portion 10C side of the bottom plate portion 20A of the diaphragm 20.
  • an ultraviolet-curing or moisture-curing adhesive is used for the second fixing portion 402C, but of course this is not limited to this and a jig or the like may also be used.
  • the diaphragm 20 to vibrate smoothly.
  • the connection positions of the first end 401A'' and the second end 402A'' are offset from the center position of the diaphragm 20 when viewed from the Z-axis direction, the diaphragm 20 will not vibrate parallel to the Z-axis direction and will tilt. This causes tilting and asymmetric deformation of the diaphragm 20, particularly at high frequencies.
  • the first end 401A'' of the piezoelectric coil 40'' is connected to the center of the diaphragm 20 (bottom plate portion 20A) of the support portion 10C when viewed from the Z-axis direction, and the second end 402A'' is connected to the bottom portion 10A at a position overlapping with the first end 401A'' when viewed from the Z-axis direction.
  • the piezoelectric coil 40'' is provided in a recessed portion of the diaphragm 20, allowing the entire acoustic device 1 to be made thinner. Furthermore, the support portion 10C that supports the piezoelectric coil 40'' is shaped so as not to block the opening, preventing the sound generated by the diaphragm 20 from being blocked.
  • the present technology can also be configured as follows. (1) a housing having an opening at one end in a first direction and a bottom at the other end in the first direction; a diaphragm supported within the housing; an acoustic device comprising: a coil-shaped core material connecting the housing and the diaphragm; and a piezoelectric coil having a piezoelectric material wound spirally around the core material. (2) The acoustic device according to (1), The piezoelectric coil is arranged along the first direction, a first end portion which is one end side in the first direction is connected to a central portion of the diaphragm when viewed from the first direction, and a second end portion which is the other end side in the first direction is connected to the housing.
  • the acoustic device according to (2), The first end and the second end are the core material.
  • An acoustic device, wherein the length of the core material in a second direction perpendicular to the first direction is 40% or more and less than 100% of the length of the diaphragm in the second direction.
  • An acoustic device, wherein the length of the piezoelectric coil in the first direction is 5% to 20% of the length of the diaphragm in a second direction perpendicular to the first direction.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

Afin d'atteindre cet objectif, un dispositif acoustique selon un mode de réalisation de la présente technologie comprend : un boîtier ayant une ouverture et une partie inférieure respectivement sur un côté et l'autre côté dans une première direction ; un diaphragme supporté dans le boîtier ; et une bobine piézoélectrique ayant un matériau de noyau en forme de bobine reliant le boîtier et le diaphragme, et un matériau piézoélectrique enroulé en spirale autour du matériau de noyau.
PCT/JP2025/022994 2024-07-08 2025-06-26 Dispositif acoustique Pending WO2026014253A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024109395 2024-07-08
JP2024-109395 2024-07-08

Publications (1)

Publication Number Publication Date
WO2026014253A1 true WO2026014253A1 (fr) 2026-01-15

Family

ID=98386597

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2025/022994 Pending WO2026014253A1 (fr) 2024-07-08 2025-06-26 Dispositif acoustique

Country Status (1)

Country Link
WO (1) WO2026014253A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0221896U (fr) * 1988-07-13 1990-02-14
JP2000354297A (ja) * 1999-06-11 2000-12-19 Pioneer Electronic Corp 圧電型スピーカ
JP2004350165A (ja) * 2003-05-23 2004-12-09 Sony Corp スピーカ
US20050279566A1 (en) * 2002-09-17 2005-12-22 Anthony Hooley Loudspeaker
JP2018067811A (ja) * 2016-10-19 2018-04-26 Tdk株式会社 圧電音響装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0221896U (fr) * 1988-07-13 1990-02-14
JP2000354297A (ja) * 1999-06-11 2000-12-19 Pioneer Electronic Corp 圧電型スピーカ
US20050279566A1 (en) * 2002-09-17 2005-12-22 Anthony Hooley Loudspeaker
JP2004350165A (ja) * 2003-05-23 2004-12-09 Sony Corp スピーカ
JP2018067811A (ja) * 2016-10-19 2018-04-26 Tdk株式会社 圧電音響装置

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