JPH03797Y2 - - Google Patents
Info
- Publication number
- JPH03797Y2 JPH03797Y2 JP1980103891U JP10389180U JPH03797Y2 JP H03797 Y2 JPH03797 Y2 JP H03797Y2 JP 1980103891 U JP1980103891 U JP 1980103891U JP 10389180 U JP10389180 U JP 10389180U JP H03797 Y2 JPH03797 Y2 JP H03797Y2
- Authority
- JP
- Japan
- Prior art keywords
- metal diaphragm
- soft rubber
- rubber ring
- metal
- attached
- 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
- 239000002184 metal Substances 0.000 claims description 56
- 239000000919 ceramic Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 description 14
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002788 crimping Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Description
【考案の詳細な説明】
この考案は電話機等に組込まれる圧電型電気音
響変換装置に関する。[Detailed Description of the Invention] This invention relates to a piezoelectric electroacoustic transducer incorporated into a telephone or the like.
従来、この種の圧電型電気音響変換装置とし
て、第１図に示すように、圧電セラミツク薄板１
を接着剤等により金属振動板２に貼着し、この金
属振動板２の周辺を筐体３に支持固定したものが
知られている。この装置は、金属振動板２および
圧電セラミツク薄板１のそれぞれの形状や支持方
法により共振周波数が決まり、その共振周波数に
一致した電気的あるいは音響的外部入力に対して
最も電気−音響変換効率が高い。一般には、圧電
セラミツク薄板１として直径10〜30mmφ、厚み
0.1〜0.4mmの薄円板が用いられ、金属振動板２と
して直径15〜40mmφ、厚み0.1〜0.4mmの薄円板が
用いられる。共振周波数は２〜10kHz程度が多
い。 Conventionally, as this type of piezoelectric electroacoustic transducer, a piezoelectric ceramic thin plate 1 is used as shown in FIG.
It is known that the diaphragm is attached to a metal diaphragm 2 with an adhesive or the like, and the periphery of the metal diaphragm 2 is supported and fixed to a housing 3. In this device, the resonant frequency is determined by the shape and support method of each of the metal diaphragm 2 and piezoelectric ceramic thin plate 1, and the electro-acoustic conversion efficiency is highest for an external electrical or acoustic input that matches the resonant frequency. . Generally, the piezoelectric ceramic thin plate 1 has a diameter of 10 to 30 mmφ and a thickness of
A thin disk having a diameter of 15 to 40 mm and a thickness of 0.1 to 0.4 mm is used as the metal diaphragm 2. The resonance frequency is often around 2 to 10kHz.
ところで第１図の支持方法では、共振周波数は
金属振動板２の直径の２乗に反比例し、厚みに比
例して高くなる。従つて電話機等に組込むため、
金属振動板２の径を小さくして全体を小型化しよ
うとすると、共振周波数が高くなりすぎるという
難点がある。また金属振動板２の周辺部を直接筐
体３に固定するため、その部分にゆるみが生じる
と非線形な振動をおこし、いわゆる濁つた音色と
なつて人間の耳に不快感を与えたり、共振のＱが
低下して電気−音響変換効率が低下する。この固
定部のゆるみは、筐体のカシメや圧着時のクリー
プ特性や経時変化、固定部の面粗さや平面度など
の工作精度などに起因し、第１図のように直接支
持を行う限り、ある程度避けられない。 In the support method shown in FIG. 1, the resonance frequency is inversely proportional to the square of the diameter of the metal diaphragm 2, and increases in proportion to the thickness. Therefore, in order to incorporate it into telephones etc.
If an attempt is made to reduce the diameter of the metal diaphragm 2 to miniaturize the entire diaphragm 2, there is a problem in that the resonant frequency becomes too high. In addition, since the peripheral part of the metal diaphragm 2 is directly fixed to the housing 3, if that part becomes loose, it will cause non-linear vibration, resulting in a so-called muddy tone that is unpleasant to the human ear, and may cause resonance. Q is lowered and the electro-acoustic conversion efficiency is lowered. This loosening of the fixed part is due to the creep characteristics and changes over time during caulking and crimping of the housing, and the work precision such as the surface roughness and flatness of the fixed part.As long as direct support is used as shown in Figure 1, Unavoidable to some extent.
これに対し、第２図に示すように、金属振動板
２の周辺でなく中間部において接着剤４により支
持する方法も知られている。第１図と第２図の支
持方法を模式的に示すとそれぞれ第３図ａ，ｂの
ようになる。即ち、第１図は金属振動板２の周辺
の振幅および角変位を共に零にした支持方法であ
り、第２図は金属振動板２の周辺を振幅および角
変位共に自由にし、共振時の節の部分を支持した
方法である。第２図の支持方法を採ることによ
り、金属振動板２の径および厚みを等しくしたと
き、第１図の支持方法に比べて高い共振周波数と
なる。 On the other hand, as shown in FIG. 2, a method is also known in which the metal diaphragm 2 is supported by an adhesive 4 not at its periphery but at its intermediate portion. The supporting methods shown in FIGS. 1 and 2 are schematically shown in FIGS. 3a and 3b, respectively. That is, FIG. 1 shows a support method in which both the amplitude and angular displacement around the metal diaphragm 2 are made zero, and FIG. This is a method that supports this part. By adopting the support method shown in FIG. 2, when the diameter and thickness of the metal diaphragm 2 are made equal, a higher resonant frequency can be obtained compared to the support method shown in FIG. 1.
さらに、第２図の支持方法をとると、第１図に
比べて不安定で構造も複雑にならざるを得ない。
また金属振動板２の周辺部と中央部では共振時の
振幅が逆相となるため、そのいずれか一方を音響
的に放射しないように遮へいしないと、電気−音
響変換効率が低下するという欠点がある。 Furthermore, if the support method shown in FIG. 2 is adopted, the structure will inevitably become unstable and more complicated than that shown in FIG.
Furthermore, since the amplitude at the time of resonance is in opposite phase between the periphery and the center of the metal diaphragm 2, unless one of them is shielded to prevent acoustic radiation, the electric-acoustic conversion efficiency will decrease. be.
この考案は上記の如き問題を解決した支持構造
の圧電型電気音響変換装置を提供することを目的
とする。 The object of this invention is to provide a piezoelectric electroacoustic transducer having a support structure that solves the above-mentioned problems.
この考案においては、第３図ａ，ｂに示す支持
方法に対し、同図ｃに示す支持方法を採用する。
これは金属振動板の周辺を支持しその周辺の振幅
を抑圧するが、周辺の角変位は自由とするもので
ある。これにより同一寸法の金属振動板を用いた
場合、第３図ａ，ｂより低い共振周波数が得られ
る。この第３図ｃの支持方法を実現するため、こ
の考案では、圧電セラミツク薄板を貼着した金属
振動板の周辺を軟質ゴムを介して筐体に固定す
る。 In this invention, the support method shown in FIG. 3c is used in place of the support methods shown in FIGS. 3a and 3b.
This supports the periphery of the metal diaphragm and suppresses the amplitude of the periphery, but allows the angular displacement of the periphery to be free. As a result, when a metal diaphragm of the same size is used, a resonance frequency lower than that of FIGS. 3a and 3b can be obtained. In order to realize the support method shown in FIG. 3c, in this invention, the periphery of the metal diaphragm to which the piezoelectric ceramic thin plate is attached is fixed to the housing via soft rubber.
ここで軟質ゴムは円環状をなして金属振動板の
外周部に取付けられ、筐体はこの軟質ゴムの外周
部を挟み込んで一体化された、金属振動板の外径
より大きい内径を有する第１および第２の金属リ
ング体により構成される。これにより、圧電セラ
ミツク薄板の一方の電極は金属振動板を介し、軟
質ゴムを介して筐体に導かれる。 Here, the soft rubber is attached to the outer periphery of the metal diaphragm in an annular shape, and the casing is integrated with the outer periphery of the soft rubber and has an inner diameter larger than the outer diameter of the metal diaphragm. and a second metal ring body. As a result, one electrode of the piezoelectric ceramic thin plate is guided to the housing via the metal diaphragm and the soft rubber.
この考案の一実施例を第４図に示す。１１が圧
電セラミツク薄板であつて、接着剤等により金属
振動板１２の中央部に貼着されている。１４は内
径が金属振動板１２より小さく、外径が金属振動
板１２より大きい軟質ゴム円環であり、その内周
面に溝が設けられていてこの溝の部分に金属振動
板１２の外周を嵌め込んでいる。こうして金属振
動板１２の外周に軟質ゴム円環１４を取付けた状
態でこれを筐体１３に固定している。筐体１３は
例えば図示のように第１の金属リング体１３1と
第２の金属リング体１３2からなり、第１の金属
リング体１３1に軟質ゴム円環１４を取付けた金
属振動板１２を載せ、その上から第２の金属リン
グ体１３2を取付けるようになつている。１５，
１６は圧電セラミツク薄板１１の電極取出し信号
線である。なお軟質ゴム円環１４としては導電性
ゴムを用いており、これにより圧電セラミツク薄
板１１の金属振動板１２側の電極は金属振動板１
２から軟質ゴム円環１４を介して筐体に取出され
る。従つて信号線１６は省略することができる。 An embodiment of this invention is shown in FIG. Reference numeral 11 denotes a piezoelectric ceramic thin plate, which is attached to the center of the metal diaphragm 12 with an adhesive or the like. 14 is a soft rubber ring whose inner diameter is smaller than that of the metal diaphragm 12 and whose outer diameter is larger than that of the metal diaphragm 12. A groove is provided on the inner circumferential surface of the ring, and the outer periphery of the metal diaphragm 12 is inserted into the groove. It's embedded. In this way, the soft rubber ring 14 is attached to the outer periphery of the metal diaphragm 12 and is fixed to the housing 13. For example, the housing 13 consists of a first metal ring body 13 1 and a second metal ring body 13 2 as shown in the figure, and a metal diaphragm 12 with a soft rubber ring 14 attached to the first metal ring body 13 1 . is mounted, and the second metal ring body 132 is attached from above. 15,
Reference numeral 16 denotes a signal line leading out from the electrode of the piezoelectric ceramic thin plate 11. Note that conductive rubber is used as the soft rubber ring 14, so that the electrode on the metal diaphragm 12 side of the piezoelectric ceramic thin plate 11 is connected to the metal diaphragm 1.
2 to the housing via a soft rubber ring 14. Therefore, the signal line 16 can be omitted.
このように、金属振動板１２の周辺を軟質ゴム
円環１４を介して筐体に固定すれば、軟質ゴム円
環１４の部分では、振幅は抑圧されるが角変位は
抑圧されにくく、近似的に第３図ｃの支持方法が
実現される。この場合、筐体の内径に比べて金属
振動板の外径が大きいと、金属振動板の角変位ま
で抑圧されてしまう。従つて図示のように、金属
振動板の外径より筐体の内径が大きいことが必要
である。ただし、このような近似が成立するため
には、軟質ゴム円環１４はシヨア硬度Ａで100以
下あるいはヤング率が金属振動板１２のそれの
１／10以下であることが必要である。これによ
り、従来の第１図あるいは第２図の構造と比較し
て、同一外形寸法の場合により低い共振周波数が
得られ、また共振周波数を同程度とした場合には
全体の小型化を図ることができる。また、弾力性
のある軟質ゴム円環１４を介して金属振動板１２
を挟み込んでいるため、密着性がよく、金属振動
板１２、軟質ゴム円環１４、筐体１３の相互間を
接着剤で固着しても接着性がよく、従つ第１図の
構造におけるような金属振動板の固定部でのゆる
みが生ぜず、不快な音色を発することもない。し
かも組立構造は簡単で信頼性も高く、外部衝げき
にも強い。 In this way, if the periphery of the metal diaphragm 12 is fixed to the housing via the soft rubber ring 14, the amplitude is suppressed in the soft rubber ring 14, but the angular displacement is hardly suppressed, and approximately The support method shown in FIG. 3c is realized. In this case, if the outer diameter of the metal diaphragm is larger than the inner diameter of the casing, even the angular displacement of the metal diaphragm will be suppressed. Therefore, as shown in the figure, it is necessary that the inner diameter of the casing is larger than the outer diameter of the metal diaphragm. However, in order for such an approximation to hold true, the soft rubber ring 14 needs to have a Shore hardness A of 100 or less, or a Young's modulus that is 1/10 or less of that of the metal diaphragm 12. As a result, compared to the conventional structure shown in Fig. 1 or 2, a lower resonant frequency can be obtained when the external dimensions are the same, and when the resonant frequency is kept at the same level, the overall size can be reduced. I can do it. In addition, the metal diaphragm 12 is connected to the elastic soft rubber ring 14.
Since the metal diaphragm 12, the soft rubber ring 14, and the housing 13 are sandwiched between them, the adhesion is good, and even when the metal diaphragm 12, the soft rubber ring 14, and the housing 13 are fixed with adhesive, the adhesion is good. The fixed part of the metal diaphragm does not loosen, and does not produce unpleasant tones. Furthermore, the assembly structure is simple, highly reliable, and resistant to external impact.
また軟質ゴム円環として導電性ゴムを用いるこ
とにより、金属振動板から取出す信号線は省略す
ることができるから、組立ておよび構造が簡単に
なり、この点でも信頼性の高いものが得られる。 Furthermore, by using conductive rubber as the soft rubber ring, the signal line taken out from the metal diaphragm can be omitted, which simplifies assembly and structure, and in this respect, a highly reliable product can be obtained.
なお、軟質ゴム円環１４は例えば第５図に示す
ように２枚の円環１４1，１４2で構成してもよ
い。この場合、第１の金属リング体１３1に第１
の軟質ゴム円環１４1、金属振動板１２、第２の
軟質ゴム円環１４2をこの順に重ね、第２の金属
リング体１３2を取付けて組立てればよい。 Note that the soft rubber ring 14 may be composed of two rings 14 1 and 14 2 as shown in FIG. 5, for example. In this case, the first metal ring body 13 1 has a first
The soft rubber ring 14 1 , the metal diaphragm 12, and the second soft rubber ring 14 2 are stacked in this order, and the second metal ring body 13 2 is attached and assembled.
第５図の構造では第１、第２の軟質ゴム円環１
４1，１４2のうち少くとも一方が導電性であれば
よい。 In the structure shown in Fig. 5, the first and second soft rubber rings 1
It is sufficient if at least one of 4 1 and 14 2 is conductive.
更に金属振動板およびこれに貼着される圧電セ
ラミツク薄板としては、通常円板が用いられる
が、角形であつてもこの考案を適用して有効であ
る。 Further, although a circular plate is normally used as the metal diaphragm and the piezoelectric ceramic thin plate attached thereto, this invention is also effective even if it is square.
第１図および第２図は従来の圧電型電気音響変
換装置の要部断面構造を示す図、第３図ａ〜ｃは
金属振動板の各種支持方法を模式的に示す図、第
４図はこの考案の一実施例の要部断面構造を示す
図、第５図は他の実施例の要部断面構造を示す図
である。
１１……圧電セラミツク薄板、１２……金属振
動板、１３……筐体、１４……軟質ゴム円環、１
５，１６……信号線。
Figures 1 and 2 are diagrams showing the cross-sectional structure of main parts of a conventional piezoelectric electroacoustic transducer, Figures 3 a to c are diagrams schematically showing various methods of supporting a metal diaphragm, and Figure 4 is FIG. 5 is a diagram showing a cross-sectional structure of a main part of one embodiment of this invention, and FIG. 5 is a diagram showing a cross-sectional structure of a main part of another embodiment. 11... Piezoelectric ceramic thin plate, 12... Metal diaphragm, 13... Housing, 14... Soft rubber ring, 1
5, 16...Signal line.
Claims (1)
外周部に導電性を有する軟質ゴム円環が取付け
られ、この軟質ゴム円環の外周部を前記金属振
動板の外側で挟み込んで一体化された第１およ
び第２の金属リング体により筐体が構成され、
前記圧電セラミツク薄板の一方の電極が前記金
属振動板を介し前記軟質ゴム円環を介して前記
筐体に導かれるようにしたことを特徴とする圧
電型電気音響変換装置。 (2) 軟質ゴム円環は、内径が金属振動板より小さ
く外径が金属振動板より大きい円環をなし、内
周面に溝が設けられこの溝により金属振動板の
外周に取付けられるものである実用新案登録請
求の範囲第１項記載の圧電型電気音響変換装
置。 (3) 軟質ゴム円環は、内径が金属振動板より小さ
く外径が金属振動板より大きい２枚の円環から
なり、この２枚の円環により金属振動板の外周
部を挟持するものである実用新案登録請求の範
囲第１項記載の圧電型電気音響変換装置。[Claims for Utility Model Registration] (1) A conductive soft rubber ring is attached to the outer periphery of a metal diaphragm to which a piezoelectric ceramic thin plate is attached, and the outer periphery of the soft rubber ring is attached to the metal diaphragm. A casing is constituted by first and second metal ring bodies that are sandwiched and integrated on the outside of the
A piezoelectric electroacoustic transducer characterized in that one electrode of the piezoelectric ceramic thin plate is guided to the housing via the metal diaphragm and the soft rubber ring. (2) A soft rubber ring is a ring whose inner diameter is smaller than that of a metal diaphragm and whose outer diameter is larger than that of a metal diaphragm, and has a groove on its inner circumferential surface that allows it to be attached to the outer periphery of a metal diaphragm. A piezoelectric electroacoustic transducer according to claim 1 of a certain utility model registration claim. (3) The soft rubber ring consists of two rings with an inner diameter smaller than the metal diaphragm and an outer diameter larger than the metal diaphragm, and the outer circumference of the metal diaphragm is held between these two rings. A piezoelectric electroacoustic transducer according to claim 1 of a certain utility model registration claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980103891U JPH03797Y2 (en) | 1980-07-24 | 1980-07-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1980103891U JPH03797Y2 (en) | 1980-07-24 | 1980-07-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5728594U JPS5728594U (en) | 1982-02-15 |
| JPH03797Y2 true JPH03797Y2 (en) | 1991-01-11 |
Family
ID=29465277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1980103891U Expired JPH03797Y2 (en) | 1980-07-24 | 1980-07-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03797Y2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6143850U (en) * | 1984-08-23 | 1986-03-22 | 株式会社クボタ | Grain frying equipment |
| JPS62122539U (en) * | 1986-01-27 | 1987-08-04 | ||
| JPH02113924U (en) * | 1989-02-28 | 1990-09-12 | ||
| CN101027937B (en) * | 2004-07-23 | 2012-11-28 | 北陆电气工业株式会社 | Piezoelectric sound producing unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4712867U (en) * | 1971-03-12 | 1972-10-16 |
-
1980
- 1980-07-24 JP JP1980103891U patent/JPH03797Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5728594U (en) | 1982-02-15 |
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