WO2006025138A1 - Transducteur piézoélectrique électroacoustique - Google Patents

Transducteur piézoélectrique électroacoustique Download PDF

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Publication number
WO2006025138A1
WO2006025138A1 PCT/JP2005/009746 JP2005009746W WO2006025138A1 WO 2006025138 A1 WO2006025138 A1 WO 2006025138A1 JP 2005009746 W JP2005009746 W JP 2005009746W WO 2006025138 A1 WO2006025138 A1 WO 2006025138A1
Authority
WO
WIPO (PCT)
Prior art keywords
piezoelectric
intermediate layer
electroacoustic transducer
resin film
diaphragm
Prior art date
Application number
PCT/JP2005/009746
Other languages
English (en)
Japanese (ja)
Inventor
Tetsuo Takeshima
Masakazu Yamauchi
Muneyuki Daidai
Manabu Sumita
Original Assignee
Murata Manufacturing Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co., Ltd. filed Critical Murata Manufacturing Co., Ltd.
Publication of WO2006025138A1 publication Critical patent/WO2006025138A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
    • G10K9/125—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means with a plurality of active elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/023—Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials

Definitions

  • the present invention relates to a piezoelectric electroacoustic transducer such as a piezoelectric resono piezoelectric sounder or a piezoelectric speaker.
  • piezoelectric electroacoustic transformation is widely used as a piezoelectric sounder or a piezoelectric receiver that generates an alarm sound or an operation sound in electronic devices, home appliances, mobile phones, and the like.
  • the conventional piezoelectric electroacoustic transducer has a problem that the resonance frequency becomes high because the piezoelectric diaphragm is accommodated in the case and the periphery of the piezoelectric diaphragm is fixed to the case.
  • the size of the piezoelectric diaphragm must be increased, and the case becomes larger.
  • there is a large drop in sound pressure between the primary resonance frequency and the secondary resonance frequency and an almost flat sound pressure characteristic cannot be obtained over a wide band! /.
  • the applicant of the present application has proposed a piezoelectric electroacoustic transducer that can achieve both a reduction in size and a low frequency, a large amount of displacement, and a substantially flat sound pressure characteristic in a wide band (patent) Reference 1).
  • a piezoelectric element having a smaller laminated structure is attached to one surface or both surfaces of a resin film, and the outer peripheral portion of the resin film is supported by a casing.
  • a piezoelectric element consists of two piezoelectric ceramic layers stacked with internal electrodes in between, and the polarization direction of each ceramic layer is the same direction, and an AC signal is generated between the main surface electrode provided on the front and back surfaces of the piezoelectric element and the inside. Is applied to generate flexural vibration.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-7400
  • a piezoelectric element having a two-layer structure is used.
  • a method of increasing the number of layers can be considered.
  • an object of the present invention is to provide a piezoelectric electroacoustic change with a wide and high sound pressure in a band.
  • the invention according to claim 1 is characterized in that a piezoelectric diaphragm smaller in size than the resin film is attached to the center of one surface of the resin film, and the peripheral part of the resin film is enclosed in a housing.
  • Each piezoelectric element has electrodes on the front and back main surfaces or inside, and by applying an AC signal between these electrodes, the two piezoelectric elements expand and contract in opposite directions in the plane direction, and the piezoelectric diaphragm as a whole vibrates and vibrates.
  • a piezoelectric type electroacoustic transducer characterized by generating the above is provided.
  • the piezoelectric diaphragm has a structure in which two piezoelectric elements are stacked with an intermediate layer therebetween, and each piezoelectric element expands and contracts in the opposite direction in the plane direction by an applied AC signal. Therefore, the piezoelectric diaphragm generates bending vibration as a whole.
  • a piezoelectric diaphragm is affixed to the resin film, and the periphery of the resin film is supported by the housing, so that the vibration of the piezoelectric diaphragm is not obstructed and has an almost flat sound pressure characteristic over a wide band. Acoustic variation is obtained.
  • the piezoelectric diaphragm is formed by laminating and bonding two piezoelectric elements with an intermediate layer in between, a high-order (secondary resonance) mode is greatly excited. As a result, high sound pressure electroacoustic transformation can be obtained in a wide band.
  • the intermediate layer of the present invention a resin adhesive having a smaller Young's modulus and density than the ceramic constituting the piezoelectric element is generally used.
  • the intermediate layer should have a uniform thickness.
  • the intermediate layer may be a resin adhesive containing a spherical filler having a uniform diameter.
  • the intermediate layer since the diameter of the filler determines the thickness of the intermediate layer, the intermediate layer has a uniform thickness. Can be obtained.
  • the intermediate layer is made by impregnating a fibrous sheet such as paper with a resin adhesive.
  • the thickness is almost determined by the fibrous sheet, and the upper and lower piezoelectric elements are bonded and fixed by the resin adhesive impregnated therein.
  • each of the two piezoelectric elements has a single piezoelectric ceramic layer, and main surface electrodes are provided on the front and back surfaces of the single piezoelectric ceramic layer.
  • An AC signal may be applied between the front and back main surface electrodes.
  • each of the two piezoelectric elements has a plurality of piezoelectric ceramic layers, and the surface of the plurality of piezoelectric ceramic layers.
  • the main surface electrode and the internal electrode are provided between the back surface and each piezoelectric ceramic layer, and the polarization directions of the adjacent piezoelectric ceramic layers are opposite to each other, and between the main surface electrode and the internal electrode on the front and back surfaces.
  • An AC signal may be applied.
  • a laminated piezoelectric vibration plate that generates flexural vibration is attached to one surface of the resin film, and the outer peripheral portion of the film is enclosed by a housing. Since it is supported by the body, the vibration of the piezoelectric diaphragm is not hindered, and an electroacoustic transducer having a broad and substantially flat sound pressure characteristic can be obtained.
  • the piezoelectric diaphragm is made by laminating and bonding two piezoelectric elements with an intermediate layer in between, the higher-order (resonance) mode is greatly excited, and electroacoustic change with high sound pressure is achieved over a wide band. Obtainable.
  • FIG. 1 is a perspective view of an example of piezoelectric electroacoustic transformation according to the present invention.
  • FIG. 2 is an exploded perspective view of the piezoelectric electroacoustic transducer shown in FIG.
  • FIG. 3 is an exploded perspective view of a piezoelectric diaphragm used in the piezoelectric electroacoustic transducer shown in FIG. 1.
  • FIG. 4 is a schematic cross-sectional view of a piezoelectric diaphragm used in the piezoelectric electroacoustic transducer shown in FIG.
  • FIG. 5 is a sound pressure characteristic diagram of a piezoelectric diaphragm having an intermediate layer and a piezoelectric diaphragm having no intermediate layer.
  • FIG. 6 A diagram showing the relationship between the thickness of the intermediate layer and the sound pressure obtained by the finite element method simulation.
  • FIG. 7 is a diagram showing the relationship between the intermediate layer thickness, resonance frequency fr, and electromechanical coupling coefficient K obtained by finite element method simulation.
  • FIG. 8 is a partial cross-sectional view of a second embodiment of a piezoelectric diaphragm.
  • FIG. 9 is a cross-sectional view of a third embodiment of a piezoelectric diaphragm including a resin film.
  • FIG. 10 is a cross-sectional view of a fourth embodiment of a piezoelectric diaphragm including a resin film.
  • FIGS. 1 to 4 show examples of the piezoelectric force that is the first embodiment of the piezoelectric electroacoustic transformation according to the present invention.
  • This embodiment includes a piezoelectric diaphragm A, a resin film B on which the piezoelectric diaphragm A is pasted, and a housing that stores the resin film B.
  • the housing has a lower cover 30 having a large number of sound emission holes 30a, a frame-shaped lower case 31, a U-shaped upper case 32, and a number of sound emission holes 33a, similar to the lower cover 30. It consists of an upper cover 33.
  • the piezoelectric diaphragm A is formed by laminating and bonding two piezoelectric elements 1 and 10 with an intermediate layer 20 therebetween, and is formed in a rectangular shape as a whole. Yes.
  • the upper piezoelectric element 1 is formed by laminating two piezoelectric ceramic layers la and lb.
  • Main surface electrodes 2 and 3 are formed on the front and back main surfaces of the piezoelectric element 1, and between the ceramic layers la and lb.
  • An internal electrode 4 is formed on the substrate.
  • the two ceramic layers la and lb are polarized in opposite directions in the thickness direction as indicated by an arrow P.
  • the lower piezoelectric element 10 has the same structure as the upper piezoelectric element 1, but the polarization direction P is opposite. That is, two piezoelectric ceramic layers 10a and 10b are laminated, main surface electrodes 12 and 13 are formed on the front and back main surfaces, and an internal electrode 14 is formed between the ceramic layers 10a and 10b.
  • the two ceramic layers 10a and 10 are polarized in the opposite direction in the thickness direction as indicated by the arrow P !.
  • the ceramic layers la, lb, 10a and 10b rectangular PZT ceramics having an outer dimension of 24 ⁇ 12 mm and a thickness of one layer of 15 m were used.
  • the intermediate layer 20 in this example uses a fibrous sheet such as Japanese paper impregnated with epoxy resin. Its thickness is about 40 m.
  • the intermediate layer 20 should have a Young's modulus and density smaller than ceramics. Specifically, the Young's modulus is 1 X 10 2 to 1 X 10 4 MPa, and the density is 0.8 to 2. Okg / m 3 Good thing.
  • the piezoelectric ceramic used in this example had a Young's modulus of 6.3 ⁇ 10 4 MPa and a density of 7.8 ⁇ 10 3 kg / m 3 .
  • the front-side main surface electrode 2 and the back-side main surface electrode 3 of the piezoelectric element 1, and the front-side main surface electrode 12 and the back-side main surface electrode 13 of the piezoelectric element 10 are one end face of the piezoelectric elements 1 and 10. And they are connected to each other through an end face electrode 5 formed on one end face of the intermediate layer 20.
  • the internal electrode 4 of the piezoelectric element 1 and the internal electrode 14 of the piezoelectric element 10 are connected to the other end face of the piezoelectric elements 1 and 10 and the end face electrode 6 formed on the other end face of the intermediate layer 20.
  • a part of the main surface electrode 2 of the upper piezoelectric element 1 is cut off, and an auxiliary electrode 7 connected to the end face electrode 6 is formed in the cut portion.
  • the end face electrodes 5 and 6 are shown separated by the piezoelectric elements 1 and 10 and the intermediate layer 20, but in actuality, the piezoelectric elements 1 and 10 and the intermediate layer 20 are laminated and bonded continuously. Formed.
  • the front and back surfaces of the piezoelectric diaphragm A are covered with resin layers 8 and 9, as shown in FIG.
  • the resin layers 8 and 9 have a role as a protective layer for preventing the piezoelectric elements 1 and 10 from cracking due to a drop impact, and are provided as necessary.
  • a notch 8a where a part of the main surface electrode 2 is exposed and a notch 8b where the auxiliary electrode 7 is exposed are formed.
  • similar notches 9a and 9b are formed in the backside resin layer 9, but these notches are provided to eliminate directionality and can be omitted.
  • the piezoelectric diaphragm A is affixed to a substantially central portion of the surface of the rectangular resin film B having a larger size.
  • the pressure-sensitive adhesive for example, a silicone-based or acrylic-based pressure-sensitive adhesive is used. However, it is not limited to adhesion, and adhesion or heat welding may be used.
  • the resin film B is thinner than the piezoelectric diaphragm A and is formed of a resin material having a Young's modulus of 1 to 200 MPa. Specifically, a resin material such as ethylene propylene rubber or styrene butadiene rubber is used.
  • ethylene propylene rubber having an outer dimension of 31.2 X 15.5 mm and a thickness of 70 m was used.
  • the upper and lower surfaces of the peripheral portion of the resin film B are bonded and supported by upper and lower cases 31, 32.
  • the cases 31 and 32 are formed of a metal plate or a resin plate having a thickness (for example, 0.25 to 0.35 mm) that can secure the vibration space of the piezoelectric diaphragm A.
  • a terminal portion 34 is attached to the upper surface of the resin film B, and the terminal portion 34 is exposed on the side portion of the upper cover 33.
  • the terminal portion 34 is provided with terminal electrodes 35 and 36 for connecting the outside and the piezoelectric diaphragm A on an insulating substrate such as a glass epoxy substrate.
  • the electrodes 2 and 7 exposed from the layer 8 are connected to each other through force leads 37 and 38.
  • the lead portions 37 and 38 may be thin film electrodes or thick film electrodes.
  • An electric signal is input to the piezoelectric diaphragm A via the terminal portion 34.
  • the upper case 32 is formed in a U shape with one end side opened.
  • the terminal portion 34 is provided on both end sides of the resin film B.
  • the upper case 32 can be constituted by a pair of parallel walls.
  • a resin film B with a piezoelectric diaphragm A attached thereto is bonded and supported by frame-like cases 31, 32 from above and below, and the openings of these cases 31, 32 are covered with a thin plate. Since it is configured to close at 30, 33, it is possible to configure a thin (less than lmm) electroacoustic transformation as a whole. Since the terminal portion 34 is provided on one end side of the electroacoustic transducer, the external connection can be made from one direction.
  • FIG. 5 shows the sound pressure characteristics of a piezoelectric electroacoustic transducer using a piezoelectric diaphragm having an intermediate layer, and a piezoelectric electroacoustic transducer using a piezoelectric diaphragm without an intermediate layer! This is shown in contrast with the sound pressure characteristics of.
  • the piezoelectric diaphragm used here has two piezoelectric ceramic layers on one side in the same way as in FIG. 4, and the intermediate layer is 40 m thick and paper is impregnated with grease.
  • Table 1 is a table comparing dimensions and sound pressure characteristics of a piezoelectric diaphragm having an intermediate layer and a piezoelectric diaphragm having no intermediate layer.
  • the piezoelectric diaphragm used here is the same as in FIG.
  • the average sound pressure is increased by 4.9 dB in the piezoelectric diaphragm with the intermediate layer compared to the piezoelectric diaphragm without the intermediate layer.
  • Fig. 6 shows the relationship between the thickness of the intermediate layer and the sound pressure by finite element simulation.
  • Fig. 7 shows the relationship between the thickness of the intermediate layer, the resonance frequency fr, and the electromechanical coupling coefficient K. It was obtained by finite element method simulation.
  • the resin film used here is a circle with a diameter of 20 mm, and the piezoelectric diaphragm is formed by laminating a circular ceramic layer with a diameter of 18 mm and a thickness of 15 m on two sides.
  • the Young's modulus of the intermediate layer lOOMPa The density was 1. Okg / m 3 .
  • the resonance frequency increases as the thickness of the intermediate layer increases, but the rate of increase of the secondary resonance frequency is greater than that of the primary resonance frequency.
  • the electromechanical coupling coefficient K it can be seen that as the thickness of the intermediate layer increases, the K of the primary resonance decreases while the K of the secondary resonance increases.
  • the thickness of the intermediate layer is 0.07 mm or less, the primary resonance K is larger than the secondary resonance K, but when it exceeds 0.07 mm, the secondary resonance K is larger than the K of the secondary resonance.
  • electroacoustic transducers are often used in the region where K of primary resonance is larger than K of secondary resonance, and the product of resonance frequency and electromechanical coupling coefficient affects sound pressure.
  • the thickness of the intermediate layer is 0.02 to 0.0.
  • FIG. 8 shows a cross-sectional structure of a second embodiment of the piezoelectric diaphragm.
  • an intermediate layer 21 in which a spherical filler 23 having a diameter of 30 ⁇ m is dispersed and mixed in a resin adhesive 22 such as an epoxy resin is used.
  • the filler 23 may be an insulating material or a metal material.
  • the thickness of the intermediate layer 21 is limited by the diameter of the filler 23, and the uniform thickness (about 40 ⁇ m) of intermediate layer 21 can be obtained.
  • FIG. 9 shows a third embodiment of the piezoelectric diaphragm.
  • the piezoelectric elements 1 and 10 bonded with the intermediate layer 20 in between have been described as having two piezoelectric ceramic layers, but the piezoelectric diaphragm A1 of the third embodiment In this case, the piezoelectric elements 1 and 10 bonded with the intermediate layer 20 therebetween have one piezoelectric ceramic layer la and 10a.
  • Arrow P indicates the direction of polarization.
  • the main surface electrodes 2 and 3 are provided on the front and back surfaces of the piezoelectric ceramic layers la and 10a, and the front surface main surface electrode 2 of the piezoelectric element 1 and the back surface main surface electrode 13 of the piezoelectric element 10 form the end surface electrode 6.
  • the back side main surface electrode 3 of the piezoelectric element 1 and the front side main surface electrode 12 of the piezoelectric element 10 are connected to each other. It is connected via the end face electrode 5.
  • FIG. 10 shows a fourth embodiment of the piezoelectric diaphragm.
  • the piezoelectric diaphragm A2 of this example has piezoelectric ceramic layers la to lc and 10a to 10c of piezoelectric elements 1, 10 force S3 layers bonded with the intermediate layer 20 therebetween.
  • Arrow P indicates the direction of polarization.
  • the main surface electrode and the internal electrode are alternately drawn out to different end portions and connected to the end surface electrodes 5 and 6. Since the number of piezoelectric ceramic layers constituting the piezoelectric elements 1 and 10 is increased, the sound pressure is higher than that of the piezoelectric diaphragm shown in FIGS. 4 and 9, and the presence of the intermediate layer 20 causes the secondary resonance sound. The pressure also increases, and an electroacoustic transducer with a wide band and high sound pressure can be obtained.
  • the structure of the housing is not limited to a frame type case and a flat plate cover that are bonded to the upper and lower surfaces of the resin film as in the embodiment.
  • the frame type case and the flat plate cover are integrated. It is also possible to adhere the concave case to the upper and lower surfaces of the resin film! / Since it is composed of a concave case that contains the resin film and a flat cover that covers the opening on the upper surface. Good.

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

Abstract

[PROBLÈMES] Fournir un transducteur piézoélectrique électroacoustique présentant une pression sonore élevée sur une large plage. [MOYENS POUR RÉSOUDRE LES PROBLÈMES] Le transducteur piézoélectrique électroacoustique est fabriqué en faisant adhérer un diaphragme piézoélectrique (A) plus petit qu'un film de résine (B) à la partie centrale d'un côté du film de résine, et en maintenant la partie périphérique du film de résine (B) sur le boîtier. Le diaphragme piézoélectrique (A) est formé en réalisant une liaison entre des éléments piézoélectriques supérieur et inférieur (1, 10), comportant une couche intermédiaire (20) prise en sandwich entre ceux-ci. Chaque élément piézoélectrique comporte une couche de céramique piézoélectrique polarisée dans le sens de l'épaisseur, et des électrodes sont prévues sur les surfaces principales avant et arrière de chaque élément piézoélectrique. Chaque élément piézoélectrique s'allonge ou inversement se contracte dans le sens du plan lorsqu'un signal alternatif est appliqué entre ces électrodes, et le diaphragme piézoélectrique génère entièrement une vibration de déformation angulaire. La pression sonore d'une résonance secondaire est augmentée grâce à une couche intermédiaire (20), et une pression sonore élevée peut être obtenue sur une large plage.
PCT/JP2005/009746 2004-08-30 2005-05-27 Transducteur piézoélectrique électroacoustique WO2006025138A1 (fr)

Applications Claiming Priority (2)

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JP2004-249912 2004-08-30
JP2004249912 2004-08-30

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WO2006025138A1 true WO2006025138A1 (fr) 2006-03-09

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007097077A1 (fr) * 2006-02-21 2007-08-30 Murata Manufacturing Co., Ltd. Corps sonore piezoelectrique
JP2013501490A (ja) * 2009-08-07 2013-01-10 バイヤー・マテリアルサイエンス・アーゲー 電気機械変換器を製造するための方法
CN102959988A (zh) * 2010-06-25 2013-03-06 京瓷株式会社 音响发生器
US8669690B2 (en) 2009-01-27 2014-03-11 Taiyo Yuden Co., Ltd. Piezolelectric sound-generating device
WO2014157006A1 (fr) * 2013-03-29 2014-10-02 富士フイルム株式会社 Film de conversion électroacoustique
CN104137570A (zh) * 2012-09-26 2014-11-05 京瓷株式会社 声音产生器、声音产生装置以及电子设备
CN108882089A (zh) * 2018-06-29 2018-11-23 维沃移动通信有限公司 一种受话器及移动终端

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JPS5683983A (en) * 1979-12-12 1981-07-08 Sony Corp Electricity-machinery conversion element
JP2003134593A (ja) * 2001-10-19 2003-05-09 Taiyo Yuden Co Ltd 圧電スピーカパネル及びそれを利用した電子機器
JP2003224313A (ja) * 2001-11-22 2003-08-08 Denso Corp 積層型圧電体素子及びその製造方法，並びにインジェクタ
JP2004007400A (ja) * 2002-04-26 2004-01-08 Murata Mfg Co Ltd 圧電型電気音響変換器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5683983A (en) * 1979-12-12 1981-07-08 Sony Corp Electricity-machinery conversion element
JP2003134593A (ja) * 2001-10-19 2003-05-09 Taiyo Yuden Co Ltd 圧電スピーカパネル及びそれを利用した電子機器
JP2003224313A (ja) * 2001-11-22 2003-08-08 Denso Corp 積層型圧電体素子及びその製造方法，並びにインジェクタ
JP2004007400A (ja) * 2002-04-26 2004-01-08 Murata Mfg Co Ltd 圧電型電気音響変換器

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7531946B2 (en) 2006-02-21 2009-05-12 Murata Manufacturing Co., Ltd. Piezoelectric sounding body
KR100927843B1 (ko) 2006-02-21 2009-11-23 가부시키가이샤 무라타 세이사쿠쇼 압전발음체
WO2007097077A1 (fr) * 2006-02-21 2007-08-30 Murata Manufacturing Co., Ltd. Corps sonore piezoelectrique
US8669690B2 (en) 2009-01-27 2014-03-11 Taiyo Yuden Co., Ltd. Piezolelectric sound-generating device
JP2013501490A (ja) * 2009-08-07 2013-01-10 バイヤー・マテリアルサイエンス・アーゲー 電気機械変換器を製造するための方法
EP2587837A1 (fr) * 2010-06-25 2013-05-01 Kyocera Corporation Générateur acoustique
CN102959988A (zh) * 2010-06-25 2013-03-06 京瓷株式会社 音响发生器
EP2587837A4 (fr) * 2010-06-25 2014-05-14 Kyocera Corp Générateur acoustique
US8897473B2 (en) 2010-06-25 2014-11-25 Kyocera Corporation Acoustic generator
CN102959988B (zh) * 2010-06-25 2016-01-20 京瓷株式会社 音响发生器
US9386378B2 (en) 2010-06-25 2016-07-05 Kyocera Corporation Acoustic generator
CN104137570A (zh) * 2012-09-26 2014-11-05 京瓷株式会社 声音产生器、声音产生装置以及电子设备
WO2014157006A1 (fr) * 2013-03-29 2014-10-02 富士フイルム株式会社 Film de conversion électroacoustique
US9635467B2 (en) 2013-03-29 2017-04-25 Fujifilm Corporation Electroacoustic converter film
CN108882089A (zh) * 2018-06-29 2018-11-23 维沃移动通信有限公司 一种受话器及移动终端

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