JP2009272978A - Flexible speaker - Google Patents

Flexible speaker Download PDF

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JP2009272978A
JP2009272978A JP2008122989A JP2008122989A JP2009272978A JP 2009272978 A JP2009272978 A JP 2009272978A JP 2008122989 A JP2008122989 A JP 2008122989A JP 2008122989 A JP2008122989 A JP 2008122989A JP 2009272978 A JP2009272978 A JP 2009272978A
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base layer
flexible speaker
electrode layers
formed
flexible
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Akio Ando
Akira Hara
Yuichi Morita
Kazuo Ono
Takehiro Sugimoto
晃 原
彰男 安藤
一穂 小野
岳大 杉本
雄一 森田
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Foster Electric Co Ltd
Nippon Hoso Kyokai <Nhk>
フォスター電機株式会社
日本放送協会
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a stable flexible speaker which can be formed in any desired shape by using a flexible film-like sounding body and has no significant change in the frequency characteristics, even if it is inflected. <P>SOLUTION: The flexible speaker consists of a base layer constituted of an elastic film formed of a polymer material such as elastomer and a pair of electrode layers formed by applying an elastic conductive polymer material on both faces of the base layer. A DC bias voltage is applied, between the electrode layers via terminal wires and an AC sound signal is superimposed on the DC bias voltage to change attracting force generated between the electrode layers. The base layer is compressed and elongated by the change in attracting force between the electrode layers, and thereby sounds are generated. The elastic materials, of which the base layer and the electrode layers are formed, increase the flexibility of the shape of the flexible speaker, and at the same time, minimize the change in the frequency characteristics due to inflection. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

この発明はフレキシブルスピーカ、詳しくは、柔軟性を有するフィルム状の電気音響変換器としての発音体からなるフレキシブルスピーカに関する。 The invention flexible speaker and, more particularly, to a flexible speaker consisting sounding body as a film-shaped electro-acoustic transducer having a flexibility.

従来のフィルム状スピーカとしては、圧電素子であるPVDF(ポリフッ化ビニリデン)を用いた圧電式スピーカがある(例えば特許文献1参照)。 Conventional film-form speaker, there is a piezoelectric speaker using a PVDF (poly (vinylidene fluoride)) is a piezoelectric element (e.g., see Patent Document 1). その場合、PVDF製のピエゾフィルムは半円筒状ないし略円筒状に湾曲させておき、両面に形成した金属皮膜による電極に電気音声信号を印加してフィルムを湾曲方向に伸縮させ、湾曲方向に直交する軸方向に放射する音響を発生させる。 In that case, the piezoelectric film made of PVDF is allowed to bend into a semi-cylindrical shape or substantially cylindrical shape, is stretchable film by applying an electric audio signal to the electrodes by the metal film formed on both sides in the curved direction, orthogonal to the bending direction generating a sound radiating axially to. しかし、このピエゾフィルムで一定の音量を発生させるにはフィルムにある程度の硬度を持たせておく必要がある一方、硬度のあるフィルムを湾曲させる事はフィルム本来の周波数特性を顕著に変化させる結果となり、その変化の幅は電気回路等で補償可能な範囲を越えるものであることが知られている。 However, in order to generate a constant volume in the piezoelectric film while it is necessary to have a certain degree of hardness to the film, it curving the film with hardness result in significantly changing the original frequency characteristic film it is known that the width of the change is beyond the compensation allowable range in electric circuits or the like. 電極として金属皮膜を用いる点もこの問題を助長している。 Also point to use a metal film as an electrode is conducive to this problem.

一方、電極間に直流バイアス電圧を印加した上で交流信号を重畳する静電式スピーカが存在するが(例えば特許文献2および3参照)、固定電極として金属電極が使用されているため、成形可能な形状には一定の制限があり、自由な変形が許されないと言う問題がある。 On the other hand, (see for example Patent Documents 2 and 3) a DC bias is voltage electrostatic speaker for superposing an AC signal on the application of the existing between the electrodes, the metal electrode is used as a fixed electrode, moldable such is the shape There are certain limitations, there is a problem that the free deformation is not allowed. また、電極間には空気しか存在しないため、変形時に極板間隔を安定に保つことが困難である点も、この問題を助長している。 Further, between the electrodes because there is only air, also that it is difficult to keep the plate spacing stable during deformation, is conducive to this problem.

更に、人工筋肉用のエラストマー素材を用いて製作するスピーカも存在するが(例えば非特許文献1および2参照)、エラストマー素材には張力が加えられているため、このスピーカは自由に変形させる事が困難であると言う問題を有する。 Further, (see e.g. Non-Patent Documents 1 and 2) are present speaker fabricated using an elastomer material for artificial muscle, since the elastomeric material is tensioned, that this speaker to freely deformed It has a problem that it is difficult.
特開平10−224893号公報 JP 10-224893 discloses 特開昭64−71400号公報 JP-A-64-71400 JP 特開平11−178098号公報 JP 11-178098 discloses

本発明は、電気音響変換器として柔軟性を有する発音体を用いることによって、所望の形状に自由に成形可能であり、湾曲によって周波数特性が大幅に変化することのない、安定した再生特性を示すフレキシブルスピーカの提供を目的とする。 The invention is illustrated by the use of the sounding body having flexibility as electro-acoustic transducer is freely molded into a desired shape, it is not to change significantly the frequency characteristics by a curved, stable reproduction characteristics and an object thereof is to provide a flexible speaker.

本発明に係るフレキシブルスピーカは、請求項1に記載の通り、弾性を有するフィルム状の高分子素材でなる基層と、導電性高分子素材で基層の両面に形成した一対の電極層と、電極層の各々に接続した一対の端子線とを備え、端子線を介して両電極層間に直流バイアス電圧を印加すると共に交流音声信号を重畳させて生じる基層の伸縮により音声を発生することを特徴とする。 Flexible loudspeaker according to the present invention, as described in claim 1, a base layer formed of a film-like polymer material having elasticity, a pair of electrode layers formed on both surfaces of the base layer with a conductive polymer material, the electrode layer and a pair of terminal wire connected to each, characterized by generating a sound by the expansion and contraction of the base layer generated by superimposing an AC audio signal while applying a DC bias voltage via terminal lines on both electrode layers .
請求項2に係る本発明のフレキシブルスピーカは、請求項1において基層をなす高分子素材をエラストマーとすることを特徴とする。 Flexible speaker of the present invention according to claim 2, characterized in that the polymer material constituting the base layer and the elastomer in claim 1.
請求項3に係る本発明のフレキシブルスピーカは、請求項1又は2において円筒状に形成され、水平面内でほぼ全指向性の指向特性を可能とすることを特徴とする。 Flexible speaker of the present invention according to claim 3 is formed in a cylindrical shape according to claim 1 or 2, characterized in that to enable substantially omnidirectional directivity characteristics in the horizontal plane.
請求項4に係る本発明のフレキシブルスピーカは、請求項1又は2において多面体、円錐体、球体を含む平曲面になるように成形することにより、放射効率の改善を可能としたことを特徴とする。 Flexible speaker of the present invention according to claim 4, polyhedral in claim 1 or 2, cone, by molding such that the flat curved surface comprising a spherical body, characterized in that it possible to improve the radiation efficiency .
請求項5に係る本発明のフレキシブルスピーカは、請求項4において平曲面を円錐体に成形されることを特徴とする。 Flexible speaker of the present invention according to claim 5, characterized in that it is formed a flat curved cone in claim 4.
請求項6に係る本発明のフレキシブルスピーカは、請求項4において平曲面を外周縁に環状フレームを備える円板状であることを特徴とする。 Flexible speaker of the present invention according to claim 6, characterized in that the outer peripheral edge of the flat curved in claim 4 is disc-shaped having an annular frame.

基層を柔軟な弾性フィルム状高分子素材でなるものとし、その両面の電極層も柔軟な導電性高分子素材でなるものとしたので、本発明によるフィルム状のフレキシブルスピーカは柔軟性に優れ、スピーカとして所望の形状に自由に形成することができ、壁や天井等に貼り付けが可能となるなど、使用の自由度が増し、また、形状に応じて向上された所望の音響放射特性ないし指向特性が得られる。 It shall become the base layer of a flexible elastic film-like polymer material, since but also both surfaces of the electrode layers made of a flexible electrically conductive polymer material, a film-like flexible loudspeaker according to the invention is excellent in flexibility, a speaker free form it is possible to, like paste on a wall or ceiling or the like becomes possible, increases the flexibility of use, also desired acoustic radiation characteristics or directivity characteristics which are improved in accordance with the shape to a desired shape as It is obtained.

本発明によるフレキシブルスピーカの基本構成と実施例1及び2を示す図1ないし図7について、発明実施上の最良の形態を説明する。 About 1 to 7 show the basic configuration of a flexible loudspeaker according to the invention and Examples 1 and 2, illustrating the best mode of the invention embodiment.

図1に、本発明の基本構成におけるフレキシブルスピーカ1aを示す。 Figure 1 shows a flexible speaker 1a in the basic configuration of the present invention. 図において、フィルム状のスピーカの基層1として弾性を有する高分子素材のポリプロピレンによるエラストマーフィルムを用い、その両面に弾性を有する導電性高分子のポリエチレンジオキシチオフェンを塗布して、基層1を介して対向する1対の電極層2及び3を形成し、各電極層に端子線4及び5の各々を接続する。 In the figure, using the elastomer film according polypropylene polymer material having elasticity as a base layer 1 of the film-like speaker, by applying a polyethylene dioxythiophene conductive polymer having elasticity on both sides, through the base layer 1 the electrode layer 2 and 3 a pair of opposed forming, connect each of the terminal wires 4 and 5 to each electrode layer. 基層1の厚さは概ね100μmから数百μmとし、電極層2および3はそれ以下の厚さで良い。 The thickness of the base layer 1 is roughly several hundred μm from the 100 [mu] m, the electrode layer 2 and 3 may be a less thickness. 図1は無バイアス時のフレキシブルスピーカ1aの概略斜視図を示す。 Figure 1 shows a schematic perspective view of a flexible speaker 1a at no bias.

上記構成のフレキシブルスピーカ1aの電極層2及び3の間に、先ず約1kVの直流バイアス電圧を印加すると、マクスウェル応力によって対向電極層間相互に引力が発生して電極層同士が引き合い、その結果基層1をなすエラストマーが圧縮され、図2において矢印で示すように、基層1の面方向の全方位に伸長する。 Between the electrode layers 2 and 3 of the flexible speaker 1a having the above configuration, first, when applying a DC bias voltage of approximately 1 kV, the counter electrode layer mutually attractive force is generated in the electrode layer to each other inquiries by Maxwell stress, as a result the base layer 1 is an elastomeric compression to form a, as indicated by the arrows in FIG. 2, extending in all directions in the plane direction of the substrate 1. この伸長状態で、図3に示すように、直流バイアス電圧に交流音声信号を重畳すると、交流の音声信号に応じて電極層間引力が変化してエラストマーが伸縮し、その伸縮運動に応じて音波が発生することとなる。 In this extended state, as shown in FIG. 3, when superposing an AC audio signal to a DC bias voltage, the elastomer expands and contracts electrode layers attraction is changed depending on an AC audio signal, the sound waves in response to the expansion and contraction so that the generated. この方式によれば、エラストマーフィルムに顕著な張力を加えなくとも十分な音量の発音が可能である。 According to this method, it is possible to pronounce loud enough without the addition of significant tension in the elastomeric film.

また、エラストマーフィルムはゴムのように高い柔軟性を持つので、エラストマーフィルムを基層1とし、同様に柔軟な高分子材を電極層2、3とする本発明のフレキシブルスピーカ1aは自由に変形して所望の形状とすることが可能であり、湾曲後も素材に対する過大な張力が作用することがないため、使用素材の共振周波数が顕著に変化することもない。 Further, elastomeric film because it has a high flexibility as a rubber, an elastomer film as a base layer 1, the flexible speaker 1a of the present invention that the electrode layers 2 and 3 the same flexible polymeric material is freely deformed it is possible to obtain a desired shape, excessive tension after bend even for materials because there is no act, nor the resonant frequency of the material used is changed significantly.

図4は実施例1における本発明のフレキシブルスピーカ10を示し、使用する高分子素材の上記柔軟性を利用して全体を湾曲させ、聴者に向けて張り出す形状としてある。 Figure 4 shows the flexible speaker 10 of the present invention in Example 1, is curved overall by utilizing the flexible polymeric material to be used, there a shape protruding toward the listener. 基層11をA4サイズで厚さ150μmのポリプロピレンによるエラストマーフィルムとし、上記基本構成と同じ電極層12、13を持つ。 The base layer 11 and the elastomeric film by the polypropylene having a thickness of 150μm in A4 size, with the same electrode layers 12 and 13 and the basic construction described above. このフレキシブルスピーカ10の電極層間に1kVの直流バイアス電圧を印加し、音声信号として正弦波交流電圧を重畳し、音声信号の周波数を変化させて音響を再生させ、これを無響室内で1mの距離で周波数特性と指向特性の測定にかけたところ、図5の特性図に見られるように、充分な音量と周波数特性が得られた。 The application of a DC bias voltage to the electrode layers 1kV of the flexible speaker 10 superimposes the sinusoidal alternating voltage as an audio signal, by changing the frequency of the audio signal is reproduced acoustically, 1m distance this in an anechoic chamber in was subjected to measurement of the frequency characteristic and directivity characteristics, as seen in the characteristic diagram of FIG. 5, a sufficient volume and frequency characteristics are obtained. なお、図において、0°、90°、180°はそれぞれフレキシブルスピーカ10の正面、側面、背面から測定した周波数特性である。 Incidentally, in FIG., 0 °, 90 °, 180 ° is the front of the flexible speaker 10, respectively, side, a frequency characteristic measured from the back.

図6は実施例2における本発明のフレキシブルスピーカ20を示し、実施例1と同じ素材による同じ構成のフィルム状フレキシブルスピーカ20は円筒形に形成される。 Figure 6 shows the flexible speaker 20 of the present invention in Example 2, a film-like flexible speaker 20 having the same structure with the same material as in Example 1 is formed into a cylindrical shape. 同様の条件で測定した周波数特性と指向特性を図7の特性図に示す。 Shown in the characteristic diagram of Fig. 7 the directivity characteristic and the frequency characteristic measured under the same conditions. 図において、0°、90°、180°はそれぞれフレキシブルスピーカ20の正面、側面、背面から測定した周波数特性である。 In FIG., 0 °, 90 °, 180 ° is the front of the flexible speaker 20, respectively, side, a frequency characteristic measured from the back. 特に1kHzにおける指向特性を実施例1の場合と比較すれば明らかなように、水平面内での指向特性が改善され、略全指向性に近い特性が円筒化によって得られることが判る。 In particular, as the directional characteristic of 1kHz it is apparent when compared with the case of Example 1 are improved directional characteristics in the horizontal plane, seen substantially the characteristics near omni-directional is obtained by a cylindrical reduction.

なお、本明細書ではエラストマーフィルムの高分子素材としてポリプロピレンを記載したが、他の高分子素材を用いる場合にも本発明が有効であることは言うまでもない。 Incidentally, in this specification has been described polypropylene as a polymer material for the elastomeric film, it is needless to say even in the case of using other polymer material is effective invention. また、電極材料としてポリエチレンジオキシチオフェンの使用を記載したが、他の導電性高分子材料を用いた場合にも本発明は有効であることも言うまでもない。 Although described the use of polyethylene dioxythiophene as an electrode material, it is also needless to say also present invention in the case of using other electrically conductive polymer material is effective. 更に、スピーカの形状としても上記の実施例1及び2に示す湾曲形と円筒形以外に、円錐形や球形を含む平曲面、更には外周をフレームで補強した円板形であってもよい。 Furthermore, in addition to the curved shape and a cylindrical also shown in Example 1 and 2 above as the shape of the speaker, a flat curved surface comprising a conical or spherical shape, or even disk-shaped reinforced the outer peripheral frame.

本発明のフレキシブルスピーカの基本的構成の概略斜視図であって、無バイアス時の状態を示す。 A schematic perspective view of a basic configuration of the flexible speaker of the present invention, showing a state when no bias. 本発明のフレキシブルスピーカの基本的構成であって表裏の電極層に直流バイアス電圧を印加し、フレキシブルスピーカが全方位に伸長した状態を示す。 The DC bias voltage is applied to the front and back electrode layers a basic configuration of the flexible speaker of the present invention, wherein the flexible speaker is extended in all directions. 本発明のフレキシブルスピーカにおいて印加した直流バイアス電圧に、交流音声信号を重畳する状態の説明図を示す。 The DC bias voltage applied in the flexible speaker of the present invention, illustrative of the state of superimposing the AC audio signal. 実施例1における湾曲形状のフレキシブルスピーカの斜視図。 Perspective view of the flexible speaker curved shape in the first embodiment. 実施例1のフレキシブルスピーカの周波数特性図。 Frequency characteristic diagram of the flexible speaker of Example 1. 実施例2における円筒形状のフレキシブルスピーカの斜視図。 Perspective view of the flexible speaker cylindrical in Example 2. 実施例2のフレキシブルスピーカの周波数特性図。 Frequency characteristic diagram of the flexible speaker of Example 2.

符号の説明 DESCRIPTION OF SYMBOLS

1a フレキシブルスピーカ 10、20 フレキシブルスピーカ 1、11、21 基層 2、12、22 電極層 3、13、23 電極層 4、14、24 端子線 5、15、25 端子線 1a flexible speaker 10,20 flexible speaker 1, 11, 21 base 2,12,22 electrode layer 3,13,23 electrode layer 4,14,24 terminal line 5, 15, 25 terminal wire

Claims (6)

  1. 弾性を有するフィルム状の高分子素材でなる基層と、導電性高分子素材で基層の両面に形成した一対の電極層と、電極層の各々に接続した一対の端子線とを備え、端子線を介して両電極層間に直流バイアス電圧を印加すると共に交流音声信号を重畳させて生じる基層の伸縮により音声を発生することを特徴とするフレキシブルスピーカ。 A base layer formed of a film-like polymer material having elasticity, a pair of electrode layers formed on both surfaces of the base layer with a conductive polymer material, and a pair of terminal wire connected to each electrode layer, a terminal line flexible speaker, characterized in that generating the voice by the expansion and contraction of the base layer generated by superimposing an AC audio signal while applying a DC bias voltage to both electrode layers through.
  2. 基層をなす高分子素材をエラストマーとすることを特徴とする請求項1記載のフレキシブルスピーカ。 Flexible speaker according to claim 1, characterized in that the polymer material constituting the base layer and the elastomer.
  3. 円筒状に形成され、水平面内でほぼ全指向性の指向特性を可能とすることを特徴とする請求項1又は2記載のフレキシブルスピーカ。 It is formed into a cylindrical shape, according to claim 1 or 2 flexible speaker according to, characterized in that to enable substantially omnidirectional directivity characteristics in the horizontal plane.
  4. 多面体、円錐体、球体を含む平曲面になるように成形することにより、放射効率の改善を可能としたことを特徴とする請求項1又は2記載のフレキシブルスピーカ。 Polyhedron, cone, by molding such that the flat curved surface comprising a spherical body, according to claim 1 or 2 flexible speaker according is characterized in that it possible to improve the radiation efficiency.
  5. 平曲面は円錐体に成形されることを特徴とする請求項4記載のフレキシブルスピーカ。 Flat curved flexible speaker according to claim 4, characterized in that it is formed into a cone.
  6. 平曲面は外周縁に環状フレームを備える円板状であることを特徴とする請求項4記載のフレキシブルスピーカ。 Flexible speaker of claim 4, wherein the flat curved surface is disc-shaped having an annular frame on the outer peripheral edge.
JP2008122989A 2008-05-09 2008-05-09 Flexible speaker Pending JP2009272978A (en)

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JP2011234317A (en) * 2010-04-30 2011-11-17 Nippon Hoso Kyokai <Nhk> Speaker system
JP2013115609A (en) * 2011-11-29 2013-06-10 Tokai Rubber Ind Ltd Speaker and reproduction band adjustment method
WO2013145411A1 (en) * 2012-03-30 2013-10-03 東海ゴム工業株式会社 Speaker
US8861755B2 (en) 2011-02-09 2014-10-14 Murata Manufacturing Co., Ltd. Piezoelectric speaker
JP5637521B2 (en) * 2011-11-29 2014-12-10 住友理工株式会社 Polymer speaker
CN104406514A (en) * 2014-11-28 2015-03-11 广东欧珀移动通信有限公司 Device and method for measuring bending deformation degree of article
WO2015076408A1 (en) * 2013-11-25 2015-05-28 京セラ株式会社 Mobile terminal
US9332353B2 (en) 2011-05-17 2016-05-03 Murata Manufacturing Co., Ltd. Plane-type speaker and AV apparatus

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