JPS636959Y2 - - Google Patents
Info
- Publication number
- JPS636959Y2 JPS636959Y2 JP1982164503U JP16450382U JPS636959Y2 JP S636959 Y2 JPS636959 Y2 JP S636959Y2 JP 1982164503 U JP1982164503 U JP 1982164503U JP 16450382 U JP16450382 U JP 16450382U JP S636959 Y2 JPS636959 Y2 JP S636959Y2
- Authority
- JP
- Japan
- Prior art keywords
- dome
- piezoelectric elements
- speaker
- diaphragm
- different
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Diaphragms For Electromechanical Transducers (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Description
【考案の詳細な説明】
この考案は周辺駆動のドーム状振動板を有する
セラミツクスピーカーの改良に関する。[Detailed Description of the Invention] This invention relates to an improvement of a ceramic speaker having a peripherally driven dome-shaped diaphragm.
従来のドーム状振動板セラミツクスピーカー
は、第１図に示すように、アルミ、チタン等の軽
金属のドーム状振動板４の外周に、中心部をケー
ス１に支持具５で保持したセラミツク等のユニモ
ルフ型またはバイモルフ型の圧電素子円板３の外
周を接着したものであつたので、電気入力インピ
ーダンスが高い（200Ω〜40Ω／10KHz）ので、
他のスピーカーと組み合わせて使用するとき、イ
ンピーダンスがあまりにも相違しすぎるので使い
にくい上に、許容入力も小さく、音響輻射能率が
低く、かつ、単一素子であるため音圧特性もピー
クデイツプが顕著に現われて、再生音質が悪い欠
点があつた。 A conventional dome-shaped diaphragm ceramic speaker, as shown in FIG. Since the outer periphery of a type or bimorph type piezoelectric element disk 3 was glued, the electrical input impedance was high (200Ω to 40Ω/10KHz).
When used in combination with other speakers, it is difficult to use because the impedance is too different, the allowable input is small, the acoustic radiation efficiency is low, and since it is a single element, the sound pressure characteristics have a noticeable peak dip. However, the problem was that the playback quality was poor.
この考案は、このような欠点をすべて解消した
周辺駆動型ドーム状振動板圧電スピーカーであつ
て、第２図、第５図の如く、ケース１の底面に貼
着した制動材２を介して、バイモルフまたユニモ
ルフの圧電素子３，３′，３，３′を複数個、円弧
状に分散配列してとりつけ、それらの圧電素子
３，３′……のそれぞれの中心部に、ドーム状振
動板４の外周を点接着的にとりつけてある。した
がつて振動板４の接着以外はフリーになつてい
る。しかして、この考案のスピーカーは、圧電素
子３と３′の振動特性たとえば共振周波数を相対
的に異ならしめてある。 This invention is a peripheral drive type dome-shaped diaphragm piezoelectric speaker that eliminates all of these drawbacks, and as shown in FIGS. A plurality of bimorph or unimorph piezoelectric elements 3, 3', 3, 3' are installed in a distributed arrangement in an arc shape, and a dome-shaped diaphragm 4 is installed at the center of each of the piezoelectric elements 3, 3'... The outer periphery is attached with dot adhesive. Therefore, the parts other than the adhesion of the diaphragm 4 are free. Therefore, in the speaker of this invention, the vibration characteristics, such as the resonance frequency, of the piezoelectric elements 3 and 3' are made relatively different.
しかるときは、圧電素子３，３′，３，３′は、
電気的、機械的にそれぞれ並列的に振動板４に接
着されるので、電気入力インピーダンスは素子の
個数分の一に減少する。第２図の場合４個である
ので、インピーダンスは50Ω〜10Ω／10KHzと低
くなり、他のスピーカーとの組み合わせも容易に
でき、かつ、許容入力も大きくなり、音響輻射能
率も高くなる。さらに、振動特性の相異なる圧電
素子３，３′を組み合わせてあるので、周波数特
性がスタガー方式的に連接して、素子３のピーク
は素子３′のデイツプにあるいは素子３のデイツ
プは素子３′のピークに重なつて、全体としてフ
ラツトな周波数特性を得られ、再生音質が向上す
る。 In such a case, the piezoelectric elements 3, 3', 3, 3' are
Since they are electrically and mechanically bonded to the diaphragm 4 in parallel, the electrical input impedance is reduced to one-fold of the number of elements. In the case of FIG. 2, there are four speakers, so the impedance is low at 50Ω to 10Ω/10KHz, making it easy to combine with other speakers, increasing the allowable input, and increasing the acoustic radiation efficiency. Furthermore, since the piezoelectric elements 3 and 3' with different vibration characteristics are combined, the frequency characteristics are connected in a staggered manner, and the peak of element 3 is the dip of element 3', or the dip of element 3 is the dip of element 3'. overlaps with the peak of , an overall flat frequency characteristic is obtained, and the reproduced sound quality is improved.
しかして、圧電素子３と３′の振動特性を異な
らしめるには、第３図のようにエレメント６，
６′あるいは電極のそれぞれの厚さを一定として
外径φ，φ′を異ならしめたり、第４図のようにエ
レメント７，７′の外径を一定として厚さｔ，
t′を異ならしめることによつて得られる。第２
図、第５図に示すように相対する圧電素子３と３
または３′と３′を同一振動特性とし、かつ、相隣
接する素子３と３′の振動特性を相異ならしめる
ことにより、振動板４の振動モードを対称的にな
し得て再生音の歪を軽減できる。 Therefore, in order to make the vibration characteristics of the piezoelectric elements 3 and 3' different, as shown in FIG.
6' or the outer diameters φ and φ' are made different while keeping the thickness of each electrode constant, or as shown in FIG.
can be obtained by making t′ different. Second
As shown in FIG.
Alternatively, by making the vibration characteristics of elements 3' and 3' the same, and by making the vibration characteristics of adjacent elements 3 and 3' different, the vibration mode of the diaphragm 4 can be made symmetrical, thereby reducing distortion of the reproduced sound. It can be reduced.
第１図は従来のスピーカーの断面図、第２図は
この考案のスピーカーの断面図、第３図及び第４
図はそれぞれこの考案の圧電素子の断面図、第５
図はこの考案のスピーカーの駆動部分の斜視図で
ある。
１はケース、２は制動材、３，３′は圧電素子、
４はドーム状振動板である。
Figure 1 is a sectional view of a conventional speaker, Figure 2 is a sectional view of the speaker of this invention, Figures 3 and 4.
The figures are respectively a cross-sectional view of the piezoelectric element of this invention and the fifth figure.
The figure is a perspective view of the driving part of the speaker of this invention. 1 is a case, 2 is a damping material, 3, 3' is a piezoelectric element,
4 is a dome-shaped diaphragm.
Claims (1)
圧電素子３，３′を複数個、円弧状に分散配列し
てとりつけ、それらの圧電素子３，３′の中心部
に、ドーム状の振動板４の外周を点接着的にとり
つけしたドーム型スピーカにおいて、構成する圧
電素子３，３′の振動特性を相対的に異ならしめ
たことを特徴とするドーム型スピーカ。 Via the braking material 2 attached to the bottom of the case 1,
A dome-shaped speaker in which a plurality of piezoelectric elements 3, 3' are installed in a distributed arrangement in an arc shape, and the outer periphery of a dome-shaped diaphragm 4 is attached to the center of the piezoelectric elements 3, 3' by dot bonding. A dome-shaped speaker characterized in that the piezoelectric elements 3 and 3' have relatively different vibration characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16450382U JPS5969597U (en) | 1982-10-28 | 1982-10-28 | speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16450382U JPS5969597U (en) | 1982-10-28 | 1982-10-28 | speaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5969597U JPS5969597U (en) | 1984-05-11 |
| JPS636959Y2 true JPS636959Y2 (en) | 1988-02-27 |
Family
ID=30360640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16450382U Granted JPS5969597U (en) | 1982-10-28 | 1982-10-28 | speaker |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5969597U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07105988B2 (en) * | 1988-07-29 | 1995-11-13 | 株式会社村田製作所 | Piezoelectric speaker |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS524029U (en) * | 1975-06-24 | 1977-01-12 |
-
1982
- 1982-10-28 JP JP16450382U patent/JPS5969597U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS524029U (en) * | 1975-06-24 | 1977-01-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5969597U (en) | 1984-05-11 |
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