JPS6358384B2 - - Google Patents
Info
- Publication number
- JPS6358384B2 JPS6358384B2 JP54023994A JP2399479A JPS6358384B2 JP S6358384 B2 JPS6358384 B2 JP S6358384B2 JP 54023994 A JP54023994 A JP 54023994A JP 2399479 A JP2399479 A JP 2399479A JP S6358384 B2 JPS6358384 B2 JP S6358384B2
- Authority
- JP
- Japan
- Prior art keywords
- varistor
- piezoelectric vibrator
- piezoelectric
- electrode
- vibrator
- 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
- 239000000919 ceramic Substances 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/87—Electrodes or interconnections, e.g. leads or terminals
- H10N30/872—Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices
Landscapes
- Piezo-Electric Transducers For Audible Bands (AREA)
- Thermistors And Varistors (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Description
【発明の詳細な説明】
本発明は圧電振動子を有する圧電振動ユニツト
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric vibrating unit having a piezoelectric vibrator.
上記圧電振動子はトランスデユーサのため、電
気→機械変換の他、同一物で機械→電気変換も行
う。したがつて外部からの力、振動によつて圧電
振動子から出力電荷を発生させることがある。 Since the piezoelectric vibrator is a transducer, it performs not only electrical to mechanical conversion, but also mechanical to electrical conversion with the same device. Therefore, an output charge may be generated from the piezoelectric vibrator due to an external force or vibration.
本発明は前記圧電振動子からの出力電荷による
電子回路の破壊を防止しようとするものである。 The present invention aims to prevent destruction of electronic circuits due to output charges from the piezoelectric vibrator.
従来より、圧電振動子は種々の電気器具、たと
えばラジオ受信機、テレビジヨン受像機のフイル
ター、超音波発振器、マイクロホン等に応用され
ている。これらの場合、使用するものによつては
圧電振動子からの出力電荷は小さく、また外部か
らの振動が伝達されにくい位置に取付けられる場
合が多い。 Conventionally, piezoelectric vibrators have been applied to various electrical appliances, such as radio receivers, television receiver filters, ultrasonic oscillators, microphones, and the like. In these cases, depending on what is used, the output charge from the piezoelectric vibrator is small, and the piezoelectric vibrator is often installed in a position where external vibrations are difficult to be transmitted.
しかるに最近になつて機器の小型化、薄形化が
盛んになりIC、LSIの使用も多くなつて、圧電振
動子を使用する場合もより薄く、より小型のもの
が使用されるようになつてきた。たとえば、圧電
ブザーの場合、極めて薄い振動板であるがゆえに
腕時計や薄型電子卓上計算機のアラーム音発生器
として使用される場合が多くなつてきている。 However, recently, devices have become increasingly smaller and thinner, and the use of ICs and LSIs has increased, and when piezoelectric vibrators are used, they are becoming thinner and smaller. Ta. For example, piezoelectric buzzers are increasingly being used as alarm sound generators for wristwatches and thin electronic desktop calculators because they have extremely thin diaphragms.
これら薄形機器の場合、圧電振動子をケースに
密着して取り付ける場合が多く、また使用形態と
して手に持つて使用するものが多くなつているた
めに、落下や外部からの振動が伝わりやすいとい
う特質を持つている。したがつて、上記のように
外部からの振動による大きい出力電荷の発生が生
じ、これにより電子回路を破壊するおそれがあつ
た。 In the case of these thin devices, the piezoelectric vibrator is often attached closely to the case, and because they are often held in the hand, they are susceptible to drops and external vibrations. have characteristics. Therefore, as described above, a large output charge is generated due to external vibrations, which may destroy the electronic circuit.
本発明はこのような電子回路の破壊を防止する
ために、あらかじめ圧電振動子にバリスタ効果を
有する半導体を一体化するものである。 In order to prevent such destruction of the electronic circuit, the present invention integrates a semiconductor having a varistor effect into the piezoelectric vibrator in advance.
以下その一実施例を添付図面を用いて説明す
る。第１図、第２図において、１は圧電磁器板、
２，３は圧電磁器板１の異なる面におのおの形成
された電極で、一方の電極３はまわりこんで、電
極２の形成面と同一面まで延びている。４は電極
２の形成面と同一面に形成されたバリスタ膜で、
電極２と３との間にサンドイツチ状に装着されて
いる。すなわち、電気的には圧電振動子と並列に
バリスタ膜４は接続される。 One embodiment will be described below with reference to the accompanying drawings. In FIGS. 1 and 2, 1 is a piezoelectric ceramic plate;
Reference numerals 2 and 3 denote electrodes formed on different surfaces of the piezoelectric ceramic plate 1, and one electrode 3 extends around the electrode 2 to the same surface as the surface on which the electrode 2 is formed. 4 is a varistor film formed on the same surface as the electrode 2 formation surface;
It is mounted between electrodes 2 and 3 in the form of a sandwich. That is, the varistor film 4 is electrically connected in parallel with the piezoelectric vibrator.
上記バリスタ膜４のバリスタ特性を第３図に示
す。ここで、バリスタ電圧をV0、圧電振動子の
駆動電圧をV1、電子回路の破壊電圧をV2とする
とき、V2＞V0＞V1となるようにバリスタ電圧V0
を設定することにより、通常、電子回路によつて
圧電振動子を駆動する場合、V1の電圧しか加わ
つていない状態で、外部より振動が加わつても圧
電振動子からの出力電荷はバリスタ膜４によつて
吸収され、電子回路を破壊することはなくなる。 The varistor characteristics of the varistor film 4 are shown in FIG. Here, when the varistor voltage is V 0 , the driving voltage of the piezoelectric vibrator is V 1 , and the breakdown voltage of the electronic circuit is V 2 , the varistor voltage V 0 is adjusted so that V 2 > V 0 > V 1 .
Normally, when a piezoelectric vibrator is driven by an electronic circuit, the output charge from the piezoelectric vibrator will not reach the varistor membrane even if vibration is applied from the outside, even if only a voltage of V 1 is applied. 4 and will no longer destroy electronic circuits.
なお、上記バリスタ膜４の形成方法について
は、電極２を形成した後、バリスタ膜４を印刷、
焼成し、次に他方の電極３を印刷、焼成するよう
にしても良いし、またチツプ状のバリスタを電極
２上に貼りつけるようにしても良い。さらには、
SiC、ZnO等の材料をスパツタ蒸着して圧電磁器
板状に形成してもよい。 Regarding the method of forming the varistor film 4, after forming the electrode 2, the varistor film 4 is printed,
After firing, the other electrode 3 may be printed and fired, or a chip-shaped varistor may be pasted on the electrode 2. Furthermore,
A piezoelectric ceramic plate may be formed by sputter deposition of a material such as SiC or ZnO.
以上説明したように本発明によれば、圧電振動
子にバリスタを並列に電気接続して一体化するこ
とにより、スペースを取ることなく、圧電振動子
からの余分な発生電荷による電子回路の破壊を防
止することができ、特に小型化、薄形化される電
子機器に用いて効果大である。 As explained above, according to the present invention, by electrically connecting a varistor to a piezoelectric vibrator in parallel and integrating it, it is possible to prevent destruction of electronic circuits due to excess charge generated from the piezoelectric vibrator without taking up space. This is especially effective when used in electronic devices that are becoming smaller and thinner.
第１図は本発明の一実施例における圧電振動ユ
ニツトの平面図、第２図は同ユニツトの断面図、
第３図は同ユニツトに用いるバリスタの特性図で
ある。
１……圧電磁器板、２，３……電極、４……バ
リスタ。
FIG. 1 is a plan view of a piezoelectric vibration unit according to an embodiment of the present invention, and FIG. 2 is a sectional view of the same unit.
FIG. 3 is a characteristic diagram of the varistor used in the unit. 1...piezoelectric ceramic plate, 2, 3...electrode, 4...varistor.
Claims (1)
一方の面にバリスタを機械的に接続するとともに
他方の面の電極をそのバリスタを接続した面にま
わりこませ、上記圧電振動子とバリスタを電気的
に並列接続されるように両者を一体化したことを
特徴とする圧電振動ユニツト。 ２ 圧電振動子の一方の面にバリスタ膜を形成し
て両者を一体化することを特徴とする特許請求の
範囲第１項記載の圧電振動ユニツト。[Claims] 1. A varistor is mechanically connected to one surface of a piezoelectric vibrator having electrodes formed on two opposing surfaces, and the electrodes on the other surface are wrapped around the surface to which the varistor is connected. A piezoelectric vibration unit characterized by integrating a piezoelectric vibrator and a varistor so that they are electrically connected in parallel. 2. The piezoelectric vibrating unit according to claim 1, characterized in that a varistor film is formed on one surface of the piezoelectric vibrator to integrate the two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2399479A JPS55117293A (en) | 1979-02-28 | 1979-02-28 | Piezoelectric vibrating unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2399479A JPS55117293A (en) | 1979-02-28 | 1979-02-28 | Piezoelectric vibrating unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55117293A JPS55117293A (en) | 1980-09-09 |
| JPS6358384B2 true JPS6358384B2 (en) | 1988-11-15 |
Family
ID=12126122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2399479A Granted JPS55117293A (en) | 1979-02-28 | 1979-02-28 | Piezoelectric vibrating unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55117293A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5893100U (en) * | 1981-12-17 | 1983-06-23 | オンキヨー株式会社 | Piezoelectric vibrator protection device |
| JPS59180599U (en) * | 1983-05-19 | 1984-12-03 | 株式会社村田製作所 | piezoelectric sound device |
| JPS60174398U (en) * | 1984-04-27 | 1985-11-19 | 株式会社村田製作所 | piezoelectric sound device |
| JPS61224599A (en) * | 1985-03-28 | 1986-10-06 | Matsushita Electric Ind Co Ltd | Composite element |
| JPS61224600A (en) * | 1985-03-28 | 1986-10-06 | Matsushita Electric Ind Co Ltd | composite element |
| JP4697528B2 (en) * | 2004-06-02 | 2011-06-08 | 太陽誘電株式会社 | Elastic wave device |
| JP4724579B2 (en) * | 2006-03-23 | 2011-07-13 | フルタ電機株式会社 | Raw seaweed cutting machine |
| JP4938572B2 (en) * | 2007-07-13 | 2012-05-23 | フルタ電機株式会社 | Retaining ring for raw seaweed cutting machine. |
-
1979
- 1979-02-28 JP JP2399479A patent/JPS55117293A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55117293A (en) | 1980-09-09 |
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