[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

WO2014163261A1 - Haut-parleur piézo-électrique - Google Patents

Haut-parleur piézo-électrique Download PDF

Info

Publication number
WO2014163261A1
WO2014163261A1 PCT/KR2013/008673 KR2013008673W WO2014163261A1 WO 2014163261 A1 WO2014163261 A1 WO 2014163261A1 KR 2013008673 W KR2013008673 W KR 2013008673W WO 2014163261 A1 WO2014163261 A1 WO 2014163261A1
Authority
WO
WIPO (PCT)
Prior art keywords
piezoelectric
cellulose
vibration
lead
speaker
Prior art date
Application number
PCT/KR2013/008673
Other languages
English (en)
Korean (ko)
Inventor
윤지선
조정호
백종후
정영훈
남중희
Original Assignee
한국세라믹기술원
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 한국세라믹기술원 filed Critical 한국세라믹기술원
Publication of WO2014163261A1 publication Critical patent/WO2014163261A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2892—Mountings or supports for transducers
    • H04R1/2896—Mountings or supports for transducers for loudspeaker transducers
    • 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
    • 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

Definitions

  • the present invention relates to a piezoelectric speaker, and more particularly to a piezoelectric speaker with improved acoustic characteristics.
  • a piezoelectric element refers to an element having a characteristic of changing electrical energy and mechanical energy from each other
  • a piezoelectric speaker is an acoustic component that generates sound in a desired frequency band by acoustically converting the mechanical movement of the piezoelectric element. It is a representative product.
  • piezoelectric speakers are thinner, lighter, and consume less power than voice coil motor (VCM) type speakers, and are being actively applied to portable terminals.
  • Conventional piezoelectric speakers include a piezoelectric speaker of a method in which a piezoelectric body is attached to an upper portion of a metal diaphragm, and a film type piezoelectric speaker made of a piezoelectric material such as PVDF (Polyvinylidene Fluoride) in the form of a film.
  • PVDF Polyvinylidene Fluoride
  • the piezoelectric speaker using the metal diaphragm has a structure in which a piezoelectric body is attached to the upper portion of the metal diaphragm, as shown in Korean Patent Laid-Open Publication No. 10-2001-0030510. Since such a piezoelectric speaker is made of a metal diaphragm, there is a problem that the output sound pressure level is low and it is difficult to reproduce sound in a low frequency band. In addition, unnecessary resonance or anti-vibration is generated from the frame supporting the diaphragm, which causes a high total harmonic distortion (THD) problem.
  • TDD total harmonic distortion
  • the film-type piezoelectric speaker is in the form of a piezoelectric vibrating plate including a piezoelectric film and electrodes formed on the upper and lower portions of the piezoelectric film, as in Korean Patent Registration No. 10-1159734, and the piezoelectric film vibrates by an electrical signal, and outputs it as sound. do.
  • Such a film-type piezoelectric speaker has a disadvantage in that the piezoelectric constant of the piezoelectric film is not large so that displacement is small, so that the film-type piezoelectric speaker must be manufactured in a large area to compensate for this.
  • the film-type piezoelectric speaker also has a disadvantage in that it has a lower output sound pressure level and total harmonic distortion (THD) in the low frequency region than the voice coil motor (VCM) type speaker. Has a limit.
  • the present invention provides a piezoelectric speaker with improved acoustic characteristics.
  • the present invention provides a piezoelectric speaker of a hybrid type that can improve the output sound pressure in the low frequency region, and can reduce the distortion of sound due to semi-vibration of the frame.
  • a piezoelectric speaker includes a piezoelectric element having a piezoelectric layer and electrodes formed on both surfaces of the piezoelectric layer; And a vibrating member attached to one side of the piezoelectric element and including cellulose.
  • the piezoelectric layer includes at least one of PZT, PMN-PT, PZN-PT, PIN-PT, PYN-PT, PVDF, PVDF-TrFE, BNT (BaNiTiO3), and BZT-BCT.
  • the adhesive layer may include at least one of an epoxy silicone resin and an acrylic oligomer.
  • It is installed so as to surround at least the vibration member, and includes a frame for supporting the vibration member.
  • the anti-vibration of the frame can be absorbed by using cellulose, which is flexible as a vibration member attached to one side of the piezoelectric element and has high elasticity. Therefore, the distortion of sound due to the semi-vibration of the frame can be reduced as in the prior art.
  • the magnitude of the vibration can be adjusted while vibrating the vibrating member itself by applying a voltage to the vibrating member having the piezoelectric characteristic and adjusting the magnitude of the voltage as necessary.
  • the vibration generated by the vibration member itself complements the piezoelectric properties of the piezoelectric layer and amplifies the vibration.
  • the sound pressure generated from the piezoelectric element and the sound pressure generated from the vibrating member are added, so that the sound pressure is improved compared with the conventional art, and in particular, the sound pressure is improved in the low frequency region, so that the output sound pressure can be evenly improved from the low frequency to the high frequency region. have.
  • a human-friendly piezoelectric speaker can be manufactured without causing a problem such as an artificial ringing.
  • FIG. 1 is a cross-sectional view showing a piezoelectric speaker according to an embodiment of the present invention.
  • FIG. 1 is a cross-sectional view showing a piezoelectric speaker according to an embodiment of the present invention.
  • a piezoelectric speaker may include a piezoelectric element 100, a vibration member 200 attached to one side of the piezoelectric element 100, and a frame for supporting the vibration member 200. 400, a cap 600 positioned above the piezoelectric element 100 and the vibrating member 200 to cover the piezoelectric element 100 and the vibrating member 200.
  • the piezoelectric element 100 includes a piezoelectric layer 110, a first electrode 120a formed on one surface of the piezoelectric layer 110, for example, an upper surface thereof, and a second electrode 120b on the other surface of the piezoelectric layer 110, for example, a lower surface thereof. do.
  • the piezoelectric layer 110 is a means having a piezoelectric characteristic by polarizing in the thickness direction, and is formed in the form of a film that is substantially rectangular in this embodiment.
  • the shape of the piezoelectric layer 110 may be variously changed without being limited to the exemplary embodiment provided that the piezoelectric characteristics that may be applied to the piezoelectric speaker are formed.
  • the piezoelectric layer 110 may be formed in various structures in which a single layer or multiple layers of thin films are stacked.
  • the piezoelectric layer 110 may be attached to the vibration member 200 in a symmetrical or asymmetrical structure.
  • the piezoelectric layer 110 is not only polycrystalline ceramics such as lead zirconate titanate (PZT) but also lead magnesium niobate-lead titanate (PMN-PT), lead zinc niobate-lead titanate (PZN-PT), and lead indium (PIN-PT).
  • PZT lead zirconate titanate
  • PMN-PT lead magnesium niobate-lead titanate
  • PZN-PT lead zinc niobate-lead titanate
  • PIN-PT lead indium
  • PN-PT niobate-lead titanate
  • PYN-PT lead ytterbium niobate-lead titanate
  • VDF polyvinylidene fluoride
  • PVDF-TrFE polyvinyledenedifluoride-tetrafluoroethylene
  • BaNiTiO 3 barium zirconate titanate-barium calcium titanate
  • the first and second electrodes 120a and 120b are formed above and below the piezoelectric layer 110, respectively, to apply an electrical signal, that is, a voltage, to the piezoelectric layer 110.
  • the first and second electrodes 120a and 120b are formed of a conductive material, for example, using carbon nanotubes (CNT), Ag, carbon (C) powder, or a metal paste such as Al, or polyaniline. ), Polyphosphothiophene (polythiophene), PEDOT (poly (3,4-ethylene-dioxythiophene), polypyrrole, PPV (polyphenylenevinylene), and the like, by using at least one or more of a conductive polymer and derivatives thereof and organic conductors Can be.
  • the first and second electrodes 120a and 120b may be manufactured in various polygonal shapes, such as a quadrangle and a fan.
  • the vibration member 200 is a means for acoustically converting a mechanical signal generated by an electrical signal applied to the piezoelectric element 100, and is attached to the lower portion of the piezoelectric element 100 by the first adhesive layer 300. It has a thicker thickness than the piezoelectric element 100 and is made of a flexible and highly elastic material.
  • a bio-based cellulose Cellulose
  • Cellulose has piezo-electric characteristics, has high elastic modulus, is lightweight, is easy to process in large areas, and has excellent acoustic impedance.
  • the cellulose may be methyl cellulose, methyl cellulose, cellulose acetate, cellulose acetate, nitro cellulose, cellulose sulfate, hydroxypropyl cellulose. It is preferable to use cellulose containing at least one selected from various cellulose derivatives such as cellulose, preferably cellulose containing at least one selected from carboxymethyl cellulose and hydroxypropyl cellulose. good.
  • the weight average molecular weight of the cellulose is preferably tens of thousands to hundreds of thousands, preferably 50,000 to 250,000, and at this time, if the weight average molecular weight is less than 50,000, there may be a problem of manufacturing a vibrating member including cellulose. If it exceeds 250,000, there may be a problem in realizing the anti-vibration absorption and piezoelectric characteristics of the vibration member including cellulose, it is preferable to use cellulose having the weight average molecular weight.
  • the vibration member 200 vibrates according to the vibration of the piezoelectric element 100, more specifically, the vibration of the piezoelectric layer 110, and the negative pressure generated from the piezoelectric element 100 and the cellulose vibration member 200. Sound pressure generated in the) is added, and the sound pressure is improved.
  • cellulose has a piezoelectric characteristic
  • the piezoelectric characteristics of the piezoelectric element 100 is supplemented or amplified Therefore, the output sound pressure in the low frequency region is improved.
  • the vibration member 200 of the present invention is flexible and uses cellulose having high elasticity, the vibration member 200 can absorb the anti-vibration of the frame 400, and thus the sound distortion is compared with the conventional one. Can be reduced.
  • the characteristics of the cellulose (Cellulose) vibration member 200 can evenly improve the output sound pressure from the low frequency to high frequency region, when using a diaphragm made of metal as in the prior art, does not cause problems such as artificial ringing Therefore, a human-friendly piezoelectric speaker can be manufactured.
  • the first adhesive layer 300 is applied between the piezoelectric element 100 and the vibration member 200 to bond the vibration member 200 to the lower portion of the piezoelectric element 100.
  • the first adhesive layer 300 is effective to use a material having a high modulus of elasticity, and in the exemplary embodiment of the present invention, at least one or more of an epoxy silicone resin and an acrylic oligomer are used. Since the first adhesive layer 300 made of a high elastic material is positioned between the piezoelectric element 100 and the vibration member 200, the vibration of the piezoelectric layer 100 may be uniformly transmitted to the vibration member 200, Anti-vibration from the frame 400 is absorbed to reduce negative distortion.
  • the frame 400 is attached to surround the vibration member 200 at least by the second adhesive layer 500 to support the vibration member 200.
  • the frame 400 is made of plastic or aluminum including polybutylene terephthalate (PBT), polyacetal (POM), polycarbonate (PC), etc. to minimize the anti-vibration when the vibration member 200 vibrates. It is preferable to be made of any one or more of them.
  • PBT polybutylene terephthalate
  • POM polyacetal
  • PC polycarbonate
  • the second adhesive layer 500 may use at least one of the same material as that of the first adhesive layer 300 described above, that is, an epoxy silicone resin and an acrylic oligomer.
  • Cap 600 is to protect the piezoelectric speaker, is installed to be connected to the frame 400 on the upper side of the piezoelectric element 100, covers the vibration member 200, the piezoelectric element 100, a plurality of sound on the front And a hole 610.
  • the shape of the sound hole 610 may be variously changed into a circle, an ellipse, a polygon, or the like.
  • the piezoelectric element 100 including the piezoelectric layer 110 and the first and second electrodes 120a and 120b is manufactured.
  • at least one of PZT, PMN-PT, PZN-PT, PIN-PT, PYN-PT, PVDF, PVDF-TrFE, BNT (BaNiTiO3), and BZT-BCT is manufactured in the form of a thin film or film.
  • the piezoelectric layer 110 is manufactured.
  • a carbon paste such as carbon nanotubes (CNT), Ag, carbon (C) powder or Al is applied to the upper and lower portions of the manufactured piezoelectric layer 110, or polyaniline, polythiophene, PEDOT (poly ( 3,4-ethylene-dioxythiophene)), polypyrrole, polyphenylenevinylene (PPV), or the like, and at least one of a conductive polymer, a derivative thereof, and an organic conductor are coated to form the first and second electrodes 120a and 120b.
  • an adhesive material including at least one of a high elastic modulus material such as an epoxy silicone resin and an acrylic oligomer may be formed under the piezoelectric element 100 or may vibrate.
  • the first adhesive layer 300 is formed by coating the upper portion of the member 200.
  • the first adhesive layer 300 is an adhesive material including at least one of a material having a high modulus of elasticity, such as an epoxy silicone resin and an acrylic oligomer.
  • the vibration member 200 is fixed to the frame 400 using the second adhesive layer 500 made of a high elastic adhesive material, and a cap 600 having a plurality of sound holes 610 is provided on the front surface thereof.
  • the vibration member 200 and the piezoelectric element 100 are covered.
  • a voltage is applied to the piezoelectric layer 110 through the first and second electrodes 120a and 120b.
  • the piezoelectric layer 110 is polarized by the applied voltage, thereby contracting or extending, and thus vibration is generated in the piezoelectric layer 110.
  • the vibration of the piezoelectric layer 110 is transmitted to the vibration member 200, thus causing the vibration member 200 to vibrate, and the sound pressure generated from the piezoelectric layer 110 and the sound pressure generated from the vibration member 200 are added. Sound pressure is improved.
  • semi-vibration is generated in the frame 400 by vibrating the piezoelectric layer 110 and the vibrating member 200.
  • the vibrating member 200 made of cellulose has excellent elastic force and high internal loss characteristics.
  • the anti-vibration of the frame 400 is absorbed by the vibration member 200. Therefore, it is possible to reduce the sound distortion caused by the semi-vibration of the frame 400.
  • the magnitude of the vibration can be adjusted while vibrating the vibrating member 200 itself.
  • the vibration generated by the vibrating member 200 itself complements the piezoelectric properties of the piezoelectric layer 110 and has an effect of amplifying the vibration, thereby improving the output sound pressure in the low frequency region as compared with the conventional art.
  • the operating voltage at which the vibration member 200 vibrates itself is lower than the operating voltage of the piezoelectric layer 110, so that the piezoelectric characteristics of the piezoelectric layer 110 may be supplemented and amplified even at a low voltage.
  • the vibration member 200 made of cellulose Cellulose
  • the piezoelectric speaker of the present invention can be the lowest resonant frequency (F 0 ) 300 ⁇ 1,000 Hz, preferably 500 ⁇ 900 Hz bar, not only has the effect of improving the sound pressure in the low frequency region, but also in the low frequency high frequency region It is possible to improve the output sound pressure evenly.
  • the piezoelectric speaker of the present invention may have a total harmony distortion (THD) of 40% or less, preferably 35% or less in a low frequency (1000 Hz or less) region, and a total harmony distortion (THD) in a high frequency (1,000 Hz or more) region. May be less than or equal to 15%, preferably less than or equal to 10%.
  • the piezoelectric speaker of the present invention is capable of preventing and / or minimizing sound distortion.
  • the present invention is a human-friendly piezoelectric speaker that improves the sound pressure evenly from the low frequency to the high frequency region, it can be widely used in mobile electronics and electrical appliances such as notebooks, portable terminals, portable audio equipment.

Landscapes

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

Abstract

La présente invention concerne un haut-parleur piézo-électrique qui comprend les éléments suivants : une couche piézo-électrique ; un élément piézo-électrique possédant des électrodes formées sur les deux côtés de la couche piézo-électrique ; et un élément de vibration qui est fixé à un côté de l'élément piézo-électrique et qui est composé de cellulose. Selon le mode de mise en œuvre de l'invention, une vibration en opposition de phase d'une trame peut être absorbée par l'élément de vibration en cellulose. Par conséquent, on peut réduire un effet sonore déformé classique entraîné par une vibration en opposition de phase d'une trame. De plus, la cellulose possède un caractère piézo-électrique, ce qui permet ainsi de fournir, lorsque c'est nécessaire, un effet piézo-électrique complémentaire à la couche piézo-électrique par l'application d'une tension à l'élément de vibration possédant un caractère piézo-électrique, et d'amplifier une vibration.
PCT/KR2013/008673 2013-04-01 2013-09-27 Haut-parleur piézo-électrique WO2014163261A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2013-0035168 2013-04-01
KR1020130035168A KR101517523B1 (ko) 2013-04-01 2013-04-01 압전 스피커

Publications (1)

Publication Number Publication Date
WO2014163261A1 true WO2014163261A1 (fr) 2014-10-09

Family

ID=51658525

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2013/008673 WO2014163261A1 (fr) 2013-04-01 2013-09-27 Haut-parleur piézo-électrique

Country Status (2)

Country Link
KR (1) KR101517523B1 (fr)
WO (1) WO2014163261A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102718381B1 (ko) 2019-04-01 2024-10-16 삼성디스플레이 주식회사 표시 장치와 그의 구동 방법
KR20210030544A (ko) 2019-09-09 2021-03-18 삼성디스플레이 주식회사 표시 장치
KR20210109075A (ko) 2020-02-26 2021-09-06 삼성디스플레이 주식회사 표시 장치

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020067840A1 (en) * 2000-08-29 2002-06-06 Fujihiko Kobayashi Piezo-electric speaker
JP2003319490A (ja) * 2002-04-19 2003-11-07 Sony Corp 振動板及びその製造方法、並びにスピーカ
JP2004015261A (ja) * 2002-06-05 2004-01-15 Foster Electric Co Ltd 電気音響変換器用振動板
KR20070046473A (ko) * 2005-10-31 2007-05-03 (주)케이에이치 케미컬 음향 진동판 및 이를 구비하는 스피커
KR20120064984A (ko) * 2010-12-10 2012-06-20 한국전자통신연구원 압전 스피커

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020067840A1 (en) * 2000-08-29 2002-06-06 Fujihiko Kobayashi Piezo-electric speaker
JP2003319490A (ja) * 2002-04-19 2003-11-07 Sony Corp 振動板及びその製造方法、並びにスピーカ
JP2004015261A (ja) * 2002-06-05 2004-01-15 Foster Electric Co Ltd 電気音響変換器用振動板
KR20070046473A (ko) * 2005-10-31 2007-05-03 (주)케이에이치 케미컬 음향 진동판 및 이를 구비하는 스피커
KR20120064984A (ko) * 2010-12-10 2012-06-20 한국전자통신연구원 압전 스피커

Also Published As

Publication number Publication date
KR101517523B1 (ko) 2015-05-04
KR20140119474A (ko) 2014-10-10

Similar Documents

Publication Publication Date Title
JP6431984B2 (ja) 電気音響変換フィルムおよびその製造方法、ならびに、電気音響変換器、フレキシブルディスプレイ、声帯マイクロフォンおよび楽器用センサー
US10567884B2 (en) Electroacoustic transducer
US8873776B2 (en) Piezoelectric speaker
US20210400396A1 (en) Display apparatus including a sound generating device
US8280081B2 (en) Electrode connection structure of speaker unit
US20220238787A1 (en) Piezoelectric film and method of producing piezoelectric film
JP2004023436A (ja) 圧電スピーカ
JP5993772B2 (ja) 電気音響変換フィルム、フレキシブルディスプレイ、声帯マイクロフォンおよび楽器用センサー
KR20030003126A (ko) 압전형 전기음향변환기 및 그 제조방법
TWI827851B (zh) 高分子複合壓電體及壓電薄膜
JP7245905B2 (ja) 高分子複合圧電体、圧電フィルム、圧電スピーカー、フレキシブルディスプレイ
TW202103501A (zh) 電聲轉換薄膜及電聲轉換器
US20170111746A1 (en) Electro-acoustic conversion film and digital speaker
WO2014163261A1 (fr) Haut-parleur piézo-électrique
US20170111745A1 (en) Electro-acoustic conversion film and digital speaker
KR101765419B1 (ko) 압전 스피커 및 이의 제조방법
EP3993439A1 (fr) Film piézoélectrique
WO2017002573A1 (fr) Convertisseur électro-acoustique
US20230217188A1 (en) Apparatus
JP7155426B2 (ja) 高分子複合圧電体、圧電フィルム、圧電スピーカー、フレキシブルディスプレイ
KR101116572B1 (ko) 셀룰로오스 압전종이로 만든 초소형 스피커
JP6297223B2 (ja) 電気音響変換フィルムおよび電気音響変換器
KR102257275B1 (ko) 압전 스피커 및 이의 제조방법
KR102254539B1 (ko) 진동막 및 이를 포함하는 음향소자
WO2020189957A1 (fr) Haut-parleur piezoélectrique et son procédé de fabrication

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13880995

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205 DATED 22/01/2016)

122 Ep: pct application non-entry in european phase

Ref document number: 13880995

Country of ref document: EP

Kind code of ref document: A1