JPH089496A - Piezoelectric speaker - Google Patents

Abstract

PURPOSE:To provide a speaker with a wide frequency range of sound by fixing couples of circular piezoelectric ceramic plates face to face across a plate, which has plural through holes linearly arranged, in a manner of closing the through holes respectively. CONSTITUTION:The piezoelectric speaker is provided with a plate 3 with plural linearly arranged through holes 2 and circular piezoelectric ceramic plate 4. The plate 4 is fixed so that it is bent and vibrating in opposite directions each other by the ac voltage on both sides of the plate 3 to close the through hole 2. When it is used, the sound from the both sides of the plate 3 become in the same direction. If such piezoelectric speakers are arranged in parallel, the effect is further improved. In this case, the plate 4 may be a bymorph putting two sheets of it together or it may be a monomorph applying one sheet of metal plate.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】この発明は、直線に並ぶ複数の音
源をもつ圧電型スピーカーに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric speaker having a plurality of sound sources arranged in a straight line.

【０００２】[0002]

【従来の技術】従来、圧電型スピーカーは図３のよう
に、一枚の板の片面または一個の空洞の片方に円形圧電
セラミックス板を固定した構造であった。2. Description of the Related Art Conventionally, as shown in FIG. 3, a piezoelectric speaker has a structure in which a circular piezoelectric ceramics plate is fixed to one surface of one plate or one of cavities.

【０００３】[0003]

【発明が解決しようとする課題】[Problems to be Solved by the Invention]

イ．従来の圧電型スピーカーは板または空洞の両面から
出る音が互いに打ち消しあうので、音の出力が低かっ
た。 ロ．特に低音の方が互いに打ち消すので、音の周波数範
囲が狭かった。 ハ．音の周波数範囲を広くするためには、板または空洞
と円形圧電セラミックス板を大きくしなければならず、
製造が困難であった。 本発明は、これらの欠点を解決するために発明されたも
のである。I. In the conventional piezoelectric speaker, the sounds emitted from both sides of the plate or the cavity cancel each other out, resulting in a low sound output. B. Especially, the low frequencies cancel each other out, so the frequency range of the sounds was narrow. C. In order to widen the sound frequency range, the plate or cavity and the circular piezoelectric ceramic plate must be enlarged.
It was difficult to manufacture. The present invention was invented to solve these drawbacks.

【０００４】[0004]

【課題を解決するための手段】以上の課題を解決するた
め、本発明に係る圧電型スピーカーは、直線に並んだ複
数の貫通孔を有する板の両面に、それぞれの貫通孔を密
閉するように円形圧電セラミックス板を向かい合わせて
固定したこと、を特徴とする。In order to solve the above problems, the piezoelectric speaker according to the present invention has a plate having a plurality of through holes arranged in a straight line, in which both through holes are sealed. The circular piezoelectric ceramic plates are fixed facing each other.

【０００５】[0005]

【作用】以上の構造において、向かい合わせた円形圧電
セラミックス板を、交流電圧により互いに反対向きに屈
曲振動させると、板の両面から出る音は互いに同じ向き
になるので、出力が高くなる。またこのような円形圧電
セラミックス板を直線上に複数個並べると、低音も互い
に打ち消すことがないので、音の周波数範囲が広くな
る。このような圧電型スピーカーを「すだれ」状に平行
に並べれば、その効果はさらに増大されるので、大出力
の、そして音の周波数範囲の広いスピーカーとなる。In the above structure, when the circular piezoelectric ceramic plates facing each other are flexurally vibrated in the opposite directions by the AC voltage, the sounds emitted from both sides of the plates are in the same directions, so that the output is increased. Further, when a plurality of such circular piezoelectric ceramic plates are arranged on a straight line, low frequencies do not cancel each other, so that the frequency range of the sound is widened. By arranging such piezoelectric speakers in parallel with each other in a "screen" shape, the effect is further enhanced, resulting in a speaker with a large output and a wide sound frequency range.

【０００６】[0006]

【実施例】以下、本発明に係る圧電型スピーカーの一実
施例を添付図面を参照して説明する。図１に示すよう
に、圧電型スピーカー（１）は、概略、直線に並んだ複
数の貫通孔（２）を有する板（３）、円形圧電セラミッ
クス板（４）にて構成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the piezoelectric speaker according to the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the piezoelectric speaker (1) is generally composed of a plate (3) having a plurality of through holes (2) arranged in a straight line, and a circular piezoelectric ceramic plate (4).

【０００７】円形圧電セラミックス板（４）は、図２に
示すように、貫通孔（２）を密閉するように板（３）の
両面に、向かい合わせた円形圧電セラミックス板（４）
が、交流電圧により互いに反対向きに屈曲振動するよう
に固定される。As shown in FIG. 2, the circular piezoelectric ceramics plate (4) has a circular piezoelectric ceramics plate (4) facing each other on both sides of the plate (3) so as to seal the through hole (2).
, Are fixed by the AC voltage so as to bend and vibrate in opposite directions.

【０００８】本発明は以上のような構造で、これを使用
するときは板（３）の両面から出る音は互いに同じ向き
になるようにする。またこのような圧電スピーカー
（１）を「すだれ」状に並べれば、その効果はさらに加
算される。The present invention has the above-mentioned structure, and when this is used, the sounds emitted from both sides of the plate (3) have the same direction. In addition, if such piezoelectric speakers (1) are arranged in a "blind" shape, the effect is further added.

【０００９】円形圧電セラミックス板は、２枚貼り合わ
せたバイモルフでもよいし、また１枚の金属板と貼り合
わせたモノモルフでもよい。The circular piezoelectric ceramics plate may be a bimorph of two sheets bonded together or a monomorph of one sheet bonded to a metal plate.

【００１０】[0010]

【発明の効果】以上の説明で明らかなように、本発明に
よれば、直線上に並ぶ複数の貫通孔を有する板の両面
に、貫通孔を密閉するように円形圧電セラミックス板を
固定するので、板の両面から出る音は、互いに増大され
て出力が大きくなる。 また本発明による圧電型スピー
カーを「すだれ」状に並べることにより、容易に大出力
のスピーカーを作ることができ、音の周波数範囲も広く
することができる。As is apparent from the above description, according to the present invention, the circular piezoelectric ceramic plates are fixed on both sides of the plate having a plurality of through holes arranged in a straight line so as to seal the through holes. , The sounds emitted from both sides of the plate are mutually increased to increase the output. Further, by arranging the piezoelectric type speakers according to the present invention in a "screen" shape, it is possible to easily make a loudspeaker having a large output and to widen a sound frequency range.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明に係る圧電型スピーカーの一実施例を示
す斜視図。FIG. 1 is a perspective view showing an embodiment of a piezoelectric speaker according to the present invention.

【図２】図１に示した圧電型スピーカーの断面図。FIG. 2 is a sectional view of the piezoelectric speaker shown in FIG.

【図３】従来例を示す斜視図。FIG. 3 is a perspective view showing a conventional example.

【符号の説明】[Explanation of symbols]

１‥‥圧電型スピーカー ２‥‥貫通孔 ３‥‥板 ４‥‥円形圧電セラミックス ５‥‥円板 1 Piezoelectric speaker 2 Penetration hole 3 Plate 4 Circular piezoelectric ceramic 5 Disc

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 直線に並ぶ複数の貫通孔をもつ板の両面
に、それぞれの貫通孔を密閉するように円形圧電セラミ
ックス板を固定した圧電型スピーカー。1. A piezoelectric speaker in which circular piezoelectric ceramic plates are fixed on both sides of a plate having a plurality of through holes arranged in a straight line so as to seal the through holes.