JPS61252798A - Plane speaker - Google Patents
Plane speakerInfo
- Publication number
- JPS61252798A JPS61252798A JP9340285A JP9340285A JPS61252798A JP S61252798 A JPS61252798 A JP S61252798A JP 9340285 A JP9340285 A JP 9340285A JP 9340285 A JP9340285 A JP 9340285A JP S61252798 A JPS61252798 A JP S61252798A
- Authority
- JP
- Japan
- Prior art keywords
- vibrating membrane
- membrane
- plane
- diaphragm
- piezoelectric
- 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.)
- Granted
Links
- 239000012528 membrane Substances 0.000 claims description 52
- 229920000642 polymer Polymers 0.000 claims description 6
- 230000008602 contraction Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 3
- 230000005236 sound signal Effects 0.000 abstract description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 abstract 2
- 239000006260 foam Substances 0.000 abstract 2
- 230000010355 oscillation Effects 0.000 abstract 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011496 polyurethane foam Substances 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920002635 polyurethane Polymers 0.000 description 3
- 239000004814 polyurethane Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000007799 cork Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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
- H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は圧電膜を利用した平面型スピーカに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a flat speaker using a piezoelectric film.
本発明は平面型スピーカに関し、両面の略全面に電極を
有する可撓性圧電膜より成る振動膜の外周部を支持体に
固定し、この振動膜の外周部分と上記支持体との間に弾
性部材を介在させて、この振動膜の少なくとも中央部分
が実質的に平面状となるようにこの振動膜を架張するこ
とＫよって、生産性に優れると共に、周波数依存性が少
なく、しかも振巾の大きい平面型スピーカを提供するも
のである。The present invention relates to a flat speaker, in which the outer periphery of a diaphragm made of a flexible piezoelectric film having electrodes on substantially the entire surface of both sides is fixed to a support, and an elastic band is formed between the outer periphery of the diaphragm and the support. By stretching the diaphragm with a member interposed so that at least the central portion of the diaphragm is substantially planar, productivity is excellent, frequency dependence is small, and amplitude is small. It provides a large flat speaker.
平面型スピーカとしては種々の異なった原理のものが知
られている。Planar speakers based on various different principles are known.
その１つは、平面上に多数の動電型スピーカを設け、各
々のスピーカから球面波を発生させて、その結果として
平面波を得ようとするものである。One of them is to provide a large number of electrodynamic speakers on a plane, generate a spherical wave from each speaker, and obtain a plane wave as a result.
しかしこの型の平面スピーカは、多数のスピーカの集合
体である為にその製造性及び生産性に難が有った。However, since this type of flat speaker is an assembly of a large number of speakers, there are difficulties in its manufacturability and productivity.
又別の原理を利用するものとして静電型電気音響変換器
が有るが、これは湿度の変化に伴って静電気の変化を生
じる点に難が有った。There is an electrostatic electroacoustic transducer that utilizes another principle, but this has a problem in that static electricity changes with changes in humidity.
更に別の原理を利用するものとして圧電性を利用するも
のが有）、この中には振動板と圧電体とを別々だ構成し
たものが有る。即ち圧電体が振動板の局所に接していて
、厚み圧電若しくはバイモルフ作用によって振動板を駆
動する。しかしこの方式においては、振動板内で、圧電
体に接している部分から接していない部分への振動の伝
播による振動の遅延が有る。There are also devices that utilize piezoelectricity that utilize a different principle. Among these devices, there are devices that have separate configurations of the diaphragm and the piezoelectric body. That is, the piezoelectric body is in contact with a portion of the diaphragm and drives the diaphragm by thickness piezoelectricity or bimorph action. However, in this method, there is a delay in vibration due to propagation of vibration from a portion in contact with the piezoelectric body to a portion not in contact with the piezoelectric body within the diaphragm.
圧電体を利用した別の例として、振動板の大部分に圧電
体が接着された構造のものが有る。しかしこの場合、圧
電体が高分子のものでは振巾が小さく、セラミックスの
ものではその周波数依存性が平坦ではないという欠点が
有った。Another example of using a piezoelectric material is one in which the piezoelectric material is bonded to most of the diaphragm. However, in this case, if the piezoelectric material is made of a polymer, the amplitude is small, and if the piezoelectric material is made of ceramic, its frequency dependence is not flat.
更に別の例として、特公昭４９−２６８９０号公報及び
特公昭５０−２２９００号公報に示されるように、高分
子圧電体自体を振動膜とするものが有る。しかし従来の
この形式のものにはやはシその振巾が小さいという欠点
が有った。As another example, as shown in Japanese Patent Publication No. 49-26890 and Japanese Patent Publication No. 50-22900, there is a piezoelectric polymer itself used as a vibrating membrane. However, this conventional type had the disadvantage that its amplitude was small.
以上のように、従来の平面型スピーカは生産性及び音響
特性の少なくともいずれかに難が有った。As described above, conventional planar speakers have problems in at least one of productivity and acoustic characteristics.
そこで本発明の課題は、上記従来技術の現状に鑑み、そ
の改良を行うことであって、特に、生産性に優れ、周波
数依存性が少なくて、振巾の大きい平面型スピーカを提
供することを目的とする。Therefore, an object of the present invention is to improve the above-mentioned prior art in view of the current state of the art, and in particular to provide a planar speaker with excellent productivity, low frequency dependence, and large amplitude. purpose.
上記課題は本発明により次のようにして解決される。即
ち本発明においては、両面の略全面に電極を有する可撓
性圧・１膜上シ成る振動膜の外周部を支持体に固定し、
この振動膜の伸縮によって比較的低応力で弾性変形可能
な弾性部材をこの振動膜の外周部分と上記支持体との間
に介在させて、この振動膜の少なくとも中央部分が実質
的に平面状となるよってこの振動膜を架張する。The above problem is solved by the present invention as follows. That is, in the present invention, the outer periphery of a vibrating membrane consisting of a flexible pressure membrane having electrodes on substantially the entire surface of both sides is fixed to a support body,
An elastic member that can be elastically deformed with relatively low stress by expansion and contraction of the diaphragm is interposed between the outer peripheral portion of the diaphragm and the support, so that at least the central portion of the diaphragm has a substantially planar shape. Therefore, this vibrating membrane is stretched.
本発明によれば、可撓性圧電膜より成る振動膜の振動が
弾性部材によって増巾されるので、振巾の大きな平面波
を放射することができる。According to the present invention, since the vibration of the vibrating membrane made of a flexible piezoelectric membrane is amplified by the elastic member, a plane wave with a large amplitude can be emitted.
以下本発明を実施例につき添付図面を参照して説明する
。The present invention will be described below with reference to embodiments and the accompanying drawings.
第１図及び第２図に本発明の第１の実施例を示す。A first embodiment of the present invention is shown in FIGS. 1 and 2. FIG.
スピーカ１は、振動膜２、弾性部材を構成する発泡ポリ
ウレタン３及び矩形状の枠体４から成っている。The speaker 1 includes a vibrating membrane 2, a polyurethane foam 3 constituting an elastic member, and a rectangular frame 4.
第２図に明示するように、振動膜２は、その中央部分２
ａが平面状となるように発泡ポリウレタン３の間に架張
されている。そして振動膜２は、その外周部２ｂ、２ｃ
において枠体４に固定されている。As clearly shown in FIG. 2, the vibrating membrane 2 has a central portion 2
It is stretched between polyurethane foams 3 so that a is flat. The vibrating membrane 2 has outer peripheral parts 2b and 2c.
It is fixed to the frame 4 at.
振動膜２は、可撓性圧電膜２１と、この可撓性圧電膜２
１の両面の略全面に設けられた電極２２．２６とから構
成されている。可撓性圧電膜２１は、製作時に必要な変
形が可能であシ且つ振動が可能な穐度に可撓性を有する
圧電膜であ）、例えば高分子圧電膜や高分子に圧電体を
分散させた組成物等によって作られる。The vibrating membrane 2 includes a flexible piezoelectric membrane 21 and a flexible piezoelectric membrane 2.
1 and electrodes 22 and 26 provided on substantially the entire surface of both sides of the substrate. The flexible piezoelectric film 21 is a highly flexible piezoelectric film that can be deformed and vibrated as required during production, for example, a polymer piezoelectric film or a polymer piezoelectric film with a piezoelectric material dispersed in it. It is made with a composition etc.
発泡ポリウレタン３は、振動膜２の外周部近傍部分と枠
体４との間に介在されている。この発泡ポリウレタン３
は扇形断面を有しておシ、振動膜２に対して摺接してい
るだけでも良いし、振動膜２に固着されていても良い。Foamed polyurethane 3 is interposed between a portion near the outer periphery of vibrating membrane 2 and frame 4 . This polyurethane foam 3
may have a sector-shaped cross section and may simply be in sliding contact with the vibrating membrane 2, or may be fixed to the vibrating membrane 2.
可撓性圧電膜２１が、延伸配向された高分子圧電膜であ
る場合には、その延伸配向方向が枠体４０辺の方向、即
ち振動膜２の固定部の方向と平行にならないようにする
のが、周波数特性上好ましい。この場合、枠体４の形状
、即ちスピーカの形状が円形や楕円形であると特に好ま
しい特性が得られる。If the flexible piezoelectric film 21 is a polymeric piezoelectric film that is stretched and oriented, the direction of its stretching orientation should not be parallel to the direction of the frame 40 sides, that is, the direction of the fixed portion of the vibrating membrane 2. is preferable in terms of frequency characteristics. In this case, particularly preferable characteristics can be obtained when the shape of the frame 4, that is, the shape of the speaker is circular or oval.
信号源５から電極２２，２３間に音声信号が供給される
と、圧電作用によって振動膜２が伸縮する。そしてこの
振動膜２゛の伸縮によって発泡ポリウレタン３が弾性変
形する。この結果振動膜２の平面状の中央部分２ａが固
定子面に対して周期的に変位し、音波が放射される。こ
の時振動膜２の中央部分２ａは、発泡ポリウレタン３０
弾性により、振動の過程において実質的に平面状を維持
される。従って実質的に平面波を放射することができる
。When an audio signal is supplied between the electrodes 22 and 23 from the signal source 5, the vibrating membrane 2 expands and contracts due to piezoelectric action. The polyurethane foam 3 is elastically deformed by the expansion and contraction of the vibrating membrane 2'. As a result, the planar central portion 2a of the vibrating membrane 2 is periodically displaced with respect to the stator surface, and sound waves are radiated. At this time, the center portion 2a of the vibrating membrane 2 is made of foamed polyurethane 30.
The elasticity ensures that it remains substantially planar during the vibration process. Therefore, substantially plane waves can be radiated.
以上の説明からも分るように、振動膜２は適度に架張さ
れる必要が有る。この場合、あまシに張力が小さいと、
振動膜２の中央部分２ａが無振動の状態でも波状或いは
湾萌状となシ、実質的に平面状にならない為に１平面波
を放射することができなくなる。逆に張力が大き過ぎる
と、圧電膜２１の圧電作用による収縮、伸長が僅かにな
シ、振動膜２の振巾が小さくなってしまう。As can be seen from the above explanation, the vibrating membrane 2 needs to be stretched appropriately. In this case, if the tension is small in the tension,
Even when the central portion 2a of the vibrating membrane 2 is not vibrating, it is wavy or curved and is not substantially planar, making it impossible to radiate one plane wave. On the other hand, if the tension is too large, the contraction and expansion of the piezoelectric membrane 21 due to the piezoelectric action will be slight, and the amplitude of the vibrating membrane 2 will become small.
第３図に本発明の第２の実施例を示す。FIG. 3 shows a second embodiment of the invention.
本例においては、一対の振動膜１２．１３がその外周部
１２ｂ、１３ｂにおいて互いに固着されている。振動膜
１２，１３は平面図において円形状に構成されておシ、
その外周部近傍部分に複数のコイルスプリング１４が適
当な間隔でこれらの振動膜１２．１３の間に取シ付けら
れている。そしてこのコイルスプリング１４の弾性付勢
力により振動膜１２．１３はその中央部分１２ａ、１３
ａが略平面状に架張されている。In this example, a pair of vibrating membranes 12.13 are fixed to each other at their outer circumferences 12b, 13b. The vibrating membranes 12 and 13 are configured in a circular shape in a plan view.
A plurality of coil springs 14 are attached near the outer periphery between the vibrating membranes 12 and 13 at appropriate intervals. The elastic biasing force of the coil spring 14 causes the vibration membrane 12.13 to move between its center portions 12a, 13.
a is stretched in a substantially planar shape.
本例においては、振動板１２．１３が各々他方の振動板
１３．１２の支持体として機能している。In this example, each diaphragm 12.13 serves as a support for the other diaphragm 13.12.
本例のような構成によってスピーカの両面方向に平面波
を放射することができる。With the configuration of this example, plane waves can be radiated in both directions of the speaker.
第４図に本発明の第３の実施例を示す。FIG. 4 shows a third embodiment of the invention.
本例も円形スピーカの例であって、弾性部材として一対
のゴムのＯリング３１，５２が用いられている。即ち円
形の枠体３３に外周部が固着された振動膜３４は、これ
ら一対のＯリング３１，３２の間を断面Ｓ字状に挿通さ
れ、下方のＯリング３１によって外側から、上方のＯリ
ング３２によって内側から夫々付勢されて架張されてい
る。This example is also an example of a circular speaker, and a pair of rubber O-rings 31 and 52 are used as elastic members. That is, the vibrating membrane 34 whose outer circumferential portion is fixed to a circular frame 33 is inserted between the pair of O-rings 31 and 32 with an S-shaped cross section, and is inserted from the outside by the lower O-ring 31 into the upper O-ring. 32, each is biased from the inside and stretched.
以上に説明した例の他、弾性部材としては、密閉空気や
コルク等の弾性体、或いは、一端部が枠体に固定され、
他端部が振動膜に当接する薄板状であって、その薄い肉
厚方向が振動膜の振動方向に対して直角に配された構造
体等を用いることができる。In addition to the examples described above, the elastic member may be an elastic body such as sealed air or cork, or one end fixed to the frame.
It is possible to use a structure having a thin plate shape, the other end of which abuts against the diaphragm, and whose thin thickness direction is arranged at right angles to the vibration direction of the diaphragm.
又、弾性部材は、振動膜の外周部分と支持体との間に介
在させる他、例えば発泡ポリウレタンのように極めて低
応力で変形可能なものであれば、実質的に平面状をなし
ている振動膜の中央部分と支持体との間に介在していて
も差し支えない。In addition to interposing the elastic member between the outer circumferential portion of the vibrating membrane and the support, the elastic member may be made of a material that can be deformed with extremely low stress, such as polyurethane foam, so that the elastic member has a substantially planar shape. It may be interposed between the central portion of the membrane and the support.
更に、弾性部材は振動膜の外周部の全てに存在する必要
は無く、例えば第２図の例において、左右いずれかの発
泡ポリウレタン３を省略しても良い。但しその場合忙は
、音波は、枠体４の形成する面に対して斜めの方向に放
射される。Further, the elastic member does not need to be present on the entire outer circumference of the vibrating membrane; for example, in the example shown in FIG. 2, the foamed polyurethane 3 on either the left or right side may be omitted. However, in that case, the sound waves are radiated in a direction oblique to the surface formed by the frame body 4.
両弾性部材が当接する振動膜の箇所は、あまシ振動膜の
外周部に近過ぎると弾性部材の変形中が小さくなって振
巾が小さくなる。逆にあまり中央に近過ぎると、振動膜
の平面波を放射する面積が小さくなって好ましくない。If the portion of the vibrating membrane where both elastic members come into contact is too close to the outer circumference of the soft vibrating membrane, the deformation of the elastic member will be small and the amplitude will be small. On the other hand, if it is too close to the center, the area of the diaphragm from which plane waves are radiated becomes small, which is undesirable.
そこで、振動膜の有効振動半径をｒとした時、弾性部材
が振動膜に当接する位置は、中央から０．９５ ｒ〜０
．７５ｒ、好ましくは０．９ｒ〜０．８ｒの範囲である
のが良い。Therefore, when the effective vibration radius of the diaphragm is r, the position where the elastic member contacts the diaphragm is 0.95 r to 0 from the center.
．． 75r, preferably in the range of 0.9r to 0.8r.
又周波数特性を改良する為に、振動膜の一方の面に別種
の膜、例えば紙等を積層しても良く、又適当な塗料を塗
布しても良い。Further, in order to improve the frequency characteristics, another type of membrane, such as paper, may be laminated on one side of the vibrating membrane, or a suitable paint may be applied.
本発明の平面型スピーカにおいては、枠体等の支持体に
よって外周部分からの音波の放射が防がれるので、実質
上平面波を放射することができる。In the planar speaker of the present invention, since the support body such as the frame prevents the radiation of sound waves from the outer peripheral portion, substantially plane waves can be emitted.
しかも振動膜の中央部分からの平面波は、この振動膜自
体が駆動体である為に位相の遅れが生じ表い。Moreover, the plane wave from the central part of the vibrating membrane has a phase delay because the vibrating membrane itself is a driving body.
又本発明の平面盤スピーカは構造が簡単であシ、その製
造性（生産性）及び耐久性に優れている。Further, the flat panel speaker of the present invention has a simple structure and is excellent in manufacturability (productivity) and durability.
又これと同時に、高分子圧電膜を用いた従来の平面型ス
ピーカに比べて振動膜の振巾を格段に大きくすることが
でき、一方、製造性に優れた平面型スピーカとしては、
従来のものに比べて周波数依存性の小さいものが得られ
る。At the same time, the width of the diaphragm can be made much larger than that of conventional planar speakers using polymer piezoelectric membranes.On the other hand, as a planar speaker with excellent manufacturability,
Compared to the conventional method, a product with smaller frequency dependence can be obtained.
更に、振動膜の振動方向における弾性部材の厚みはあま
り大きくしなくとも充分である為、スピーカ全体の厚み
として例えば５１ＩＩＩｌ程度の薄屋のものを作ること
ができる。それ故、例えば壁掛スピーカ、ポケットラジ
オ用スピーカ、音の出るポスター、インターホン、ブザ
ー、ポケット電話等広範囲に利用することができる。Furthermore, since the thickness of the elastic member in the vibration direction of the diaphragm does not need to be made very large, it is possible to manufacture a thin speaker with an overall thickness of, for example, about 51IIIl. Therefore, it can be used in a wide range of applications, such as wall-mounted speakers, pocket radio speakers, sound posters, intercoms, buzzers, and pocket telephones.
第１図は本発明の第１実施例によるスピーカの外観斜視
図、第２図は第１図の■−■線断面図、第３図は第２実
施例の第２図と同様の断面図、第４図は第６実施例の一
部破断斜視図である。
同図面に用いた符号において、
２．１２．１５、ダ・・・振動膜
３・・・・・・・・・・・・発泡ポリウレタン４．３３
・・・・・・枠体
１４・・・・・・・・・・・・コイルスフリング２１
・・・・・・・・・・・・可撓性圧電膜２２・・・・・
・・・・・・・電極
６１．３２・・・・・・０リング
である。Fig. 1 is an external perspective view of a speaker according to a first embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a sectional view similar to Fig. 2 of the second embodiment. , FIG. 4 is a partially cutaway perspective view of the sixth embodiment. In the codes used in the same drawing, 2.12.15, Da... Vibration membrane 3...... Polyurethane foam 4.33
・・・・・・Frame 14 ・・・・・・・・・ Coil spring 21
......Flexible piezoelectric film 22...
. . . Electrode 61.32 . . . 0 ring.
Claims (1)
振動膜と、 この振動膜の外周部を固定する為の支持体と、上記振動
膜の外周部分と上記支持体との間に介在して上記振動膜
の伸縮により弾性変形する弾性部材とを夫々具備し、 上記振動膜の少なくとも中央部分が実質的に平面状とな
るように上記振動膜が振動可能に架張されていることを
特徴とする平面型スピーカ。 ２、弾性部材として発泡プラスチックが用いられている
ことを特徴とする特許請求の範囲第１項に記載の平面型
スピーカ。 ３、延伸配向された高分子圧電膜で上記振動膜が構成さ
れており、この振動膜の延伸配向方向がこの振動膜の固
定部に対して平行とならないように架張されていること
を特徴とする特許請求の範囲第１項又は第２項に記載の
平面型スピーカ。[Scope of Claims] 1. A vibrating membrane made of a flexible piezoelectric membrane having electrodes on substantially the entire surface of both sides, a support for fixing the outer circumferential portion of the vibrating membrane, and the outer circumferential portion of the vibrating membrane and the above. and an elastic member that is interposed between the vibrating membrane and the support and is elastically deformed by the expansion and contraction of the vibrating membrane, so that the vibrating membrane can vibrate so that at least a central portion of the vibrating membrane has a substantially planar shape. A flat speaker characterized by being stretched. 2. The flat speaker according to claim 1, wherein foamed plastic is used as the elastic member. 3. The vibrating membrane is composed of a stretched and oriented polymer piezoelectric membrane, and the vibrating membrane is stretched so that the stretching orientation direction thereof is not parallel to the fixed portion of the vibrating membrane. A flat speaker according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9340285A JPS61252798A (en) | 1985-04-30 | 1985-04-30 | Plane speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9340285A JPS61252798A (en) | 1985-04-30 | 1985-04-30 | Plane speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61252798A true JPS61252798A (en) | 1986-11-10 |
| JPH0428200B2 JPH0428200B2 (en) | 1992-05-13 |
Family
ID=14081303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9340285A Granted JPS61252798A (en) | 1985-04-30 | 1985-04-30 | Plane speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61252798A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141200A (en) * | 1988-11-22 | 1990-05-30 | Iwatsu Electric Co Ltd | Piezoelectric type electroacoustic transducer |
| JPH03123996A (en) * | 1989-10-07 | 1991-05-27 | Mitsuyoshi Kikuchi | Preventing machine for leaving things behind |
| FR2920013A1 (en) * | 2007-08-16 | 2009-02-20 | Renault Sas | Element e.g. fascia, for motor vehicle, has vibration generating unit comprising body deforming membrane along direction so that membrane vibrates along direction when generator delivers alternating current with frequency of specific range |
| WO2012132262A1 (en) * | 2011-03-31 | 2012-10-04 | Ｎｅｃカシオモバイルコミュニケーションズ株式会社 | Oscillator |
| WO2013047872A1 (en) * | 2011-09-30 | 2013-04-04 | 富士フイルム株式会社 | Electroacoustic converter and display device |
| WO2020090562A1 (en) * | 2018-10-31 | 2020-05-07 | 正毅 千葉 | Dielectric elastomer transducer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5140852U (en) * | 1974-09-20 | 1976-03-26 | ||
| JPS5220295U (en) * | 1975-07-30 | 1977-02-14 |
-
1985
- 1985-04-30 JP JP9340285A patent/JPS61252798A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5140852U (en) * | 1974-09-20 | 1976-03-26 | ||
| JPS5220295U (en) * | 1975-07-30 | 1977-02-14 |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02141200A (en) * | 1988-11-22 | 1990-05-30 | Iwatsu Electric Co Ltd | Piezoelectric type electroacoustic transducer |
| JPH03123996A (en) * | 1989-10-07 | 1991-05-27 | Mitsuyoshi Kikuchi | Preventing machine for leaving things behind |
| FR2920013A1 (en) * | 2007-08-16 | 2009-02-20 | Renault Sas | Element e.g. fascia, for motor vehicle, has vibration generating unit comprising body deforming membrane along direction so that membrane vibrates along direction when generator delivers alternating current with frequency of specific range |
| WO2012132262A1 (en) * | 2011-03-31 | 2012-10-04 | Ｎｅｃカシオモバイルコミュニケーションズ株式会社 | Oscillator |
| US9093953B2 (en) | 2011-03-31 | 2015-07-28 | Nec Casio Mobile Communications, Ltd. | Oscillator |
| JP5958463B2 (en) * | 2011-03-31 | 2016-08-02 | 日本電気株式会社 | Oscillator |
| WO2013047872A1 (en) * | 2011-09-30 | 2013-04-04 | 富士フイルム株式会社 | Electroacoustic converter and display device |
| JP2014241628A (en) * | 2011-09-30 | 2014-12-25 | 富士フイルム株式会社 | Electroacoustic transducer and display device |
| WO2020090562A1 (en) * | 2018-10-31 | 2020-05-07 | 正毅 千葉 | Dielectric elastomer transducer |
| JPWO2020090562A1 (en) * | 2018-10-31 | 2021-09-30 | 正毅 千葉 | Dielectric elastomer transducer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0428200B2 (en) | 1992-05-13 |
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