JPH0233300A - Piezoelectric speaker - Google Patents
Piezoelectric speakerInfo
- Publication number
- JPH0233300A JPH0233300A JP18439988A JP18439988A JPH0233300A JP H0233300 A JPH0233300 A JP H0233300A JP 18439988 A JP18439988 A JP 18439988A JP 18439988 A JP18439988 A JP 18439988A JP H0233300 A JPH0233300 A JP H0233300A
- Authority
- JP
- Japan
- Prior art keywords
- diaphragm
- piezoelectric
- sounding body
- piezoelectric sounding
- node
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011347 resin Substances 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229920006248 expandable polystyrene Polymers 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- -1 for example Polymers 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
【発明の詳細な説明】 童業上■釈■分団 本発明は、圧電スピーカに関する。[Detailed description of the invention] Children's Work ■Shaku■ Branch The present invention relates to piezoelectric speakers.
災来災伎止
圧電スピーカとして、本願出願人は第８図（正面図）、
第９図（第８図のＩＸ−ＩＸ線による断面図）に示すも
のを提案している。これは、振動板３の外周部が弾性支
持片２を介してフレーム１に支持されており、この振動
板３に圧電発音体４が支持部３ｃを介して固定され、こ
の圧電発音体４により振動板３が駆動される構成となっ
ている。As a piezoelectric speaker to prevent disasters, the applicant has proposed the following as shown in Fig. 8 (front view).
What is proposed is shown in FIG. 9 (a sectional view taken along line IX-IX in FIG. 8). This is because the outer peripheral part of the diaphragm 3 is supported by the frame 1 via the elastic support piece 2, and the piezoelectric sounding body 4 is fixed to this diaphragm 3 via the support part 3c. The configuration is such that the diaphragm 3 is driven.
前記振動板３は、大小２枚の発泡樹脂板３ａ、３ｂを貼
り合わせたものであり、大きい方３ａを前面側に配して
いる。上記圧電発音体４は、一対の圧電体４ａ、４ａと
、これらにて挟まれた金属板４ｂとを有し、圧電体４ａ
にて金属板４ｂを撓ませることにより振動板３を駆動す
る。よって、圧電スピーカから音が発せられる。The diaphragm 3 is made by pasting together two foamed resin plates 3a and 3b, one large and one small, with the larger one 3a disposed on the front side. The piezoelectric sounding body 4 includes a pair of piezoelectric bodies 4a, 4a, and a metal plate 4b sandwiched between the piezoelectric bodies 4a, 4a.
The diaphragm 3 is driven by bending the metal plate 4b. Therefore, sound is emitted from the piezoelectric speaker.
しよ゛と る
第１０図は、振動板３の中央部に圧電発音体４を設けた
圧電スピーカの場合の音圧周波数特性を示す。この場合
には、ピークがある周波数域Ａに振動板３の１次の共振
が現れ、この共振周波数付近で音圧に大きな山谷が生じ
ている。FIG. 10 shows the sound pressure frequency characteristics in the case of a piezoelectric speaker in which the piezoelectric sounding body 4 is provided in the center of the diaphragm 3. In this case, first-order resonance of the diaphragm 3 appears in the frequency range A where the peak exists, and large peaks and troughs occur in the sound pressure near this resonance frequency.
従って、上記周波数域Ａに現れた振動板３の共振による
音圧の山谷にて、スピーカの音質が悪くなるという問題
があった。なお、周波数域Ｂにあるピークは、圧電発音
体４の１次の共振によるものであり、また、周波数Ｃ以
上にある複数のピークは、高次の共振に基づくものであ
る。Therefore, there is a problem in that the sound quality of the speaker deteriorates at the peaks and troughs of the sound pressure caused by the resonance of the diaphragm 3 that appear in the frequency range A. Note that the peak in the frequency range B is due to the first-order resonance of the piezoelectric sounding body 4, and the plurality of peaks in the frequency range C or higher are due to the higher-order resonance.
本発明は、斯かる事情に鑑みてなされたものであり、振
動板の１次の共振発生を防止して、音質のよい圧電スピ
ーカを提供することを目的とする。The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a piezoelectric speaker with good sound quality by preventing the occurrence of primary resonance of the diaphragm.
ｉ ″“ るための
本発明は、フレームに弾性支持片を介して支持されてい
る振動板を、この振動板に取付けた圧電発音体にて駆動
させる圧電スピーカにおいて、前記圧電発音体が、振動
板における１次共振モードの節部に取付けられているこ
とを特徴とする。The present invention provides a piezoelectric speaker in which a diaphragm supported by a frame via an elastic support piece is driven by a piezoelectric sounding body attached to the diaphragm, in which the piezoelectric sounding body generates vibrations. It is characterized by being attached to the node of the primary resonance mode in the plate.
作−一一一月一
本発明にあっては、振動板における１次共振モードの節
部に圧電発音体が取付けられているので、圧電発音体に
より前記節部が他の振動板部分と共に駆動され、振動板
全面が振動する。In the present invention, since the piezoelectric sounding body is attached to the node of the primary resonance mode of the diaphragm, the node is driven by the piezoelectric sounding body together with other parts of the diaphragm. The entire surface of the diaphragm vibrates.
裏−見一皿
本発明の一実施例を第１図乃至第３図に基づき説明する
。第１図は本発明スピーカを示す正面図、第２図は第１
図のｎ−ｎ線による断面図であり、従来品を示す第８，
９図と同一部分には同一番号を付している。このスピー
カは、従来のものとは圧電発音体４の取付は位置及び数
を除いた以外は全て同様である。即ち、フレーム１に、
例えば発泡ウレタン、ゴム、革等の弾性材料からなる弾
性支持片を介して、四角形状をした発泡樹脂、例えば発
泡ポリスチレンからなる振動板３が支持され、振動板３
の四隅より少し中央側に寄った４位置に、圧電発音体４
が夫々取付けられている。この圧電発音体４は、例えば
ＰＺＴ等からなる一対の円形の圧電体４ａ、４ａを、こ
れよりも大径である円形の金属板４ｂの両面に貼着した
構成である。One embodiment of the present invention will be described with reference to FIGS. 1 to 3. Fig. 1 is a front view showing the speaker of the present invention, and Fig. 2 is a front view showing the speaker of the present invention.
FIG.
The same parts as in Figure 9 are given the same numbers. This speaker is the same as the conventional speaker except for the mounting position and number of piezoelectric sounding elements 4. That is, in frame 1,
A square-shaped diaphragm 3 made of foamed resin, for example, foamed polystyrene, is supported via an elastic support piece made of an elastic material such as urethane foam, rubber, or leather.
Piezoelectric sounding elements 4 are placed at 4 positions slightly closer to the center than the four corners of the
are installed respectively. This piezoelectric sounding body 4 has a structure in which a pair of circular piezoelectric bodies 4a, 4a made of, for example, PZT or the like are adhered to both sides of a circular metal plate 4b having a larger diameter.
圧電発音体４の取付は位置については、次のようにして
決定している。即ち、四角形状をした振動板３の場合、
振動板３の１次共振モードは、第３図に示すように縦方
向と横方向に現れ、夫々の振動が中央Ｅ、Ｆと両端Ｇ、
Ｈとの間に節１． Ｊを持っているので、節Ｉの線分
ｉと節Ｊの線分ｊとが交わる交点、つまりこれを境にし
て分割振動が生じる点としている。The mounting position of the piezoelectric sounding body 4 is determined as follows. That is, in the case of the square-shaped diaphragm 3,
The primary resonance mode of the diaphragm 3 appears in the vertical and horizontal directions as shown in FIG.
Section 1 between H. J, the intersection point where line segment i of node I intersects line segment j of node J, that is, the point at which split vibration occurs is set as the boundary.
第４図は、上記交点に圧電発音体４を取付けた本発明ス
ピーカにおける音圧周波数特性を示している。この場合
は、分割振動が生じる点を起点として圧電発音体４が駆
動するので、実際には分割振動の発生がなく、従来破線
にて示すピークが生じていた周波数域Ａにおける振動板
３の共振が消失すると共に、周波数域Ａ近傍での音圧が
均一となる。FIG. 4 shows the sound pressure frequency characteristics of the speaker of the present invention in which the piezoelectric sounding body 4 is attached to the above-mentioned intersection. In this case, since the piezoelectric sounding body 4 is driven starting from the point where split vibration occurs, split vibration does not actually occur, and the diaphragm 3 resonates in the frequency range A where the peak shown by the broken line conventionally occurred. disappears, and the sound pressure near frequency range A becomes uniform.
次に、本発明を円板状の振動板を有する圧電スピーカに
適用した場合を説明する。第５図はその正面図、第６図
は第５図のＶＩ−ＶＩ線による断面図である。このスピ
ーカは、フレーム１５弾性支持片２及び振動板３が夫々
円形に形成されており、円形の振動板３にはこの中心回
りの３等配した位置に圧電発音体４が取付けられている
。Next, a case where the present invention is applied to a piezoelectric speaker having a disc-shaped diaphragm will be described. FIG. 5 is a front view thereof, and FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. In this speaker, a frame 15, an elastic support piece 2, and a diaphragm 3 are each formed in a circular shape, and piezoelectric sounding bodies 4 are attached to the circular diaphragm 3 at three equally spaced positions around the center.
この取付は位置については、次のようにして決定してい
る。即ち、円形をした振動板３の場合、振動板３の１次
共振モードは、第７図に示すように、中心Ｏとこれを挟
む両端Ｐ、Ｑとの間に節Ｒが現れ、この節Ｒが直径の約
７０％の位置で周方向に連続して存在するため、基本的
に節Ｒの円形線ｒ上の点としている。但し、円形線ｒの
上に、圧電発音体４を１個だけ或いは２個取付けた場合
には、振動板３の全面を均等に駆動させることができな
いので、３個以上取付けるのが好ましい。The mounting position is determined as follows. That is, in the case of a circular diaphragm 3, the primary resonance mode of the diaphragm 3 is as shown in FIG. exists continuously in the circumferential direction at a position of about 70% of the diameter, so it is basically a point on the circular line r of the node R. However, if only one or two piezoelectric sounding bodies 4 are attached on the circular line r, the entire surface of the diaphragm 3 cannot be driven evenly, so it is preferable to attach three or more piezoelectric sounding bodies 4.
このため、本実施例では３個取付けている。Therefore, in this embodiment, three are installed.
主１曵処果
以上詳述した如く本発明による場合には、振動板におけ
る１次共振モードの節部に圧電発音体が取付けられてい
るので、圧電発音体により前記節部を他の振動板部分と
共に駆動することが可能となり、これにより振動板全面
を振動させ得、振動板の１次共振モードにおける共振発
生が消失して音圧レベルが平坦である音質の良好な圧電
スピーカの提供を可能となし得る優れた効果を奏する。Main Effects As described in detail above, in the case of the present invention, a piezoelectric sounding body is attached to the node of the primary resonance mode of the diaphragm. This makes it possible to vibrate the entire surface of the diaphragm, eliminating resonance in the diaphragm's primary resonance mode, making it possible to provide a piezoelectric speaker with good sound quality and a flat sound pressure level. It has excellent effects.
第１図は本発明スピーカを示す正面図、第２図は第１図
のｍ−ｕ線による断面図、第３図は振動板の１次共振モ
ードの発生状態を示す図、第４図は本発明による場合の
音圧周波数特性を示すグラフ、第５図は本発明を円板状
の振動板を有する圧電スピーカに通用した場合の正面図
、第６図は第５図のＶＩ−ＶＩ線による断面図、第７図
は円形振動板の１次共振モードの発生状態を示す図、第
８図は従来提案した圧電スピーカ例を示す正面図、第９
図は第８図のＩＸ−ＩＸ線による断面図、第１０図はそ
の場合の音圧周波数特性を示すグラフである。
１・・・フレーム、２・・・弾性支持片、３・・・振動
板、４・・・圧電発音体。Fig. 1 is a front view showing the speaker of the present invention, Fig. 2 is a sectional view taken along line mu in Fig. 1, Fig. 3 is a diagram showing the generation state of the primary resonance mode of the diaphragm, and Fig. 4 is A graph showing sound pressure frequency characteristics according to the present invention, FIG. 5 is a front view when the present invention is applied to a piezoelectric speaker having a disc-shaped diaphragm, and FIG. 6 is a line VI-VI in FIG. 5. 7 is a diagram showing the generation state of the primary resonance mode of the circular diaphragm, FIG. 8 is a front view showing an example of a conventionally proposed piezoelectric speaker, and FIG.
The figure is a cross-sectional view taken along line IX-IX in FIG. 8, and FIG. 10 is a graph showing the sound pressure frequency characteristics in that case. DESCRIPTION OF SYMBOLS 1... Frame, 2... Elastic support piece, 3... Vibration plate, 4... Piezoelectric sounding body.
Claims (1)
動板を、この振動板に取付けた圧電発音体にて駆動させ
る圧電スピーカにおいて、 前記圧電発音体が、振動板における１次共振モードの節
部に取付けられていることを特徴とする圧電スピーカ。(1) In a piezoelectric speaker in which a diaphragm supported by a frame via an elastic support piece is driven by a piezoelectric sounding body attached to the diaphragm, the piezoelectric sounding body drives the first resonance mode of the diaphragm. A piezoelectric speaker characterized by being attached to a node.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18439988A JPH0233300A (en) | 1988-07-22 | 1988-07-22 | Piezoelectric speaker |
| US07/552,650 US5031222A (en) | 1988-07-22 | 1990-07-12 | Piezoelectric speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18439988A JPH0233300A (en) | 1988-07-22 | 1988-07-22 | Piezoelectric speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0233300A true JPH0233300A (en) | 1990-02-02 |
Family
ID=16152491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18439988A Pending JPH0233300A (en) | 1988-07-22 | 1988-07-22 | Piezoelectric speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0233300A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0511695U (en) * | 1991-07-19 | 1993-02-12 | 株式会社村田製作所 | Piezo speaker |
| DE202011002840U1 (en) | 2011-02-17 | 2011-06-30 | Ho Hsin Progressive Technology Co., Ltd | Piezoelectric area loudspeaker |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5693499A (en) * | 1979-12-27 | 1981-07-29 | Trio Kenwood Corp | Speaker |
| JPS6312992B2 (en) * | 1983-05-31 | 1988-03-23 | Sumitomo Metal Ind |
-
1988
- 1988-07-22 JP JP18439988A patent/JPH0233300A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5693499A (en) * | 1979-12-27 | 1981-07-29 | Trio Kenwood Corp | Speaker |
| JPS6312992B2 (en) * | 1983-05-31 | 1988-03-23 | Sumitomo Metal Ind |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0511695U (en) * | 1991-07-19 | 1993-02-12 | 株式会社村田製作所 | Piezo speaker |
| DE202011002840U1 (en) | 2011-02-17 | 2011-06-30 | Ho Hsin Progressive Technology Co., Ltd | Piezoelectric area loudspeaker |
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