JPS5843140Y2 - piezoelectric switch - Google Patents
piezoelectric switchInfo
- Publication number
- JPS5843140Y2 JPS5843140Y2 JP1978009561U JP956178U JPS5843140Y2 JP S5843140 Y2 JPS5843140 Y2 JP S5843140Y2 JP 1978009561 U JP1978009561 U JP 1978009561U JP 956178 U JP956178 U JP 956178U JP S5843140 Y2 JPS5843140 Y2 JP S5843140Y2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- surface wave
- piezoelectric chip
- comb
- chip
- 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
Description
【考案の詳細な説明】
本考案は表面波を利用した圧電スイッチに関するもので
ある。[Detailed Description of the Invention] The present invention relates to a piezoelectric switch that utilizes surface waves.
以下、本考案の一実施例を示す第１図〜第３図の図面を
用いて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings of FIGS. 1 to 3.
第１図に本考案の圧電スイッチに用いる表面波圧電チッ
プを示しており、この表面波圧電チップ１は圧電性を有
する圧電性磁器板２の表面に互いに対向する一対の櫛形
電極３，４を形成することにより構成され、そしてその
櫛形電極３，４には電気信号を加える端子５ａ、５ｂ、
５Ｃ，５ｄが設けられている。FIG. 1 shows a surface wave piezoelectric chip used in the piezoelectric switch of the present invention, and this surface wave piezoelectric chip 1 has a pair of comb-shaped electrodes 3 and 4 facing each other on the surface of a piezoelectric ceramic plate 2 having piezoelectric properties. The comb-shaped electrodes 3, 4 have terminals 5a, 5b, which apply electrical signals,
5C and 5d are provided.
この第１図に示す表面波圧電チップ１には矢印６で示す
領域のみに外部から力を加えれば、出力信号を得ること
ができる。By applying an external force to the surface wave piezoelectric chip 1 shown in FIG. 1 only in the area indicated by the arrow 6, an output signal can be obtained.
第２図に本考案の一実施例による圧電スイッチを示して
おり、図において７はほは゛断面コ字状のケースで、こ
のケース７の内底面中央部には表面波圧電チップ１が接
着され、かつその周囲には突出部８が形成されている。FIG. 2 shows a piezoelectric switch according to an embodiment of the present invention. In the figure, 7 is a case with a roughly U-shaped cross section, and a surface wave piezoelectric chip 1 is glued to the center of the inner bottom surface of the case 7. , and a protrusion 8 is formed around it.
９はケース７の開放端を塞ぐように取付けられたゴム等
の弾性物質よりなる操作板で、この操作板９は前記ケー
ス７の突出部８に裏面の一部を当接させており、はぼ中
央部を押圧することにより第２図の点線で示すように湾
曲して表面波圧電チップ１の表面に接触する。Reference numeral 9 denotes an operation plate made of an elastic material such as rubber, which is attached to close the open end of the case 7. The operation plate 9 has a part of its back surface in contact with the protrusion 8 of the case 7. By pressing the center part, it curves as shown by the dotted line in FIG. 2 and comes into contact with the surface of the surface wave piezoelectric chip 1.
この時、操作板９は表面波圧電チップ１の櫛形電極３，
４若しくは表面波の伝搬路としての櫛形電極３，４間に
接し、表面波の励受信、伝搬に機械的な阻害を加えるこ
ととなる。At this time, the operation plate 9 controls the comb-shaped electrodes 3 of the surface wave piezoelectric chip 1,
4 or between the comb-shaped electrodes 3 and 4, which serve as a propagation path for surface waves, and mechanically impede the excitation, reception, and propagation of surface waves.
ところで、この表面波とは、圧電性物質の表面に形成さ
れる表面波動受信用の櫛形電極に電気信号が印加された
時に電気信号が機械的振動に変換されたもので、圧電性
物質の表面から１波長以内の深さに９０％以上の伝搬エ
ネルギーを有するものである。By the way, surface waves are generated when an electrical signal is applied to a comb-shaped electrode for receiving surface waves formed on the surface of a piezoelectric material, and the electrical signal is converted into mechanical vibration. 90% or more of the propagation energy is within one wavelength from the depth.
従って、伝搬エネルギーが圧電性物質の表面に集中して
いるため、表面に外部がら力を加えると、表面の伝搬エ
ネルギーはその力によってクランプされた状態になり、
損失となって現われ、そして、表面にエネルギーが集中
しているため、圧電スイッチとして使用した場合には小
さな操作力で大きい出力を得ることか−で゛きる。Therefore, since the propagation energy is concentrated on the surface of the piezoelectric material, when an external force is applied to the surface, the propagation energy on the surface is clamped by that force.
This appears as a loss, and since the energy is concentrated on the surface, when used as a piezoelectric switch, it is possible to obtain a large output with a small operating force.
第３図にその時の電気特性を示している。Figure 3 shows the electrical characteristics at that time.
ここで、表面波圧電チップ１の櫛形電極３，４の電気特
性は次の式で表わされる。Here, the electrical characteristics of the comb-shaped electrodes 3 and 4 of the surface wave piezoelectric chip 1 are expressed by the following equation.
■＝λｆ。■=λf.
但し、Ｖ：圧電物質の表面波速度
λ：波長
ｆｏ：中心周波数
従って、端子５ａ、５ｂを入力、端子５Ｃ，５ｄを出力
とし、端子５ａ、５ｂに電気信号を加えると、端子５
Ｃ，５ｄには第３図の曲線１０で示す電気信号が得られ
る。However, V: Surface wave velocity of piezoelectric material λ: Wavelength fo: Center frequency Therefore, when terminals 5a and 5b are input and terminals 5C and 5d are output, and an electric signal is applied to terminals 5a and 5b, terminal 5
An electrical signal shown by curve 10 in FIG. 3 is obtained at C, 5d.
そして、外部からの力によって表面波の励受信・伝搬エ
ネルギーが阻害され、見かけ上の損失が増加すると、第
３図の曲線１１で示す電気信号が得られる。Then, when the excitation/reception/propagation energy of the surface wave is inhibited by an external force and the apparent loss increases, an electric signal shown by curve 11 in FIG. 3 is obtained.
また、表面波圧電チップ１への力の印加をやめれば、元
の曲線１０の特性に戻る。Furthermore, if the application of force to the surface wave piezoelectric chip 1 is stopped, the characteristic of the original curve 10 is returned to.
このように、表面にエネルギーの集中する表面波圧電チ
ップ１を圧電スイッチに利用すれば、わずかな機械的押
圧力で大きな電気信号の変化を得ることができ、しかも
確実で、高い信頼性を有するスイッチとして提供するこ
とができる。In this way, if the surface wave piezoelectric chip 1, in which energy is concentrated on the surface, is used in a piezoelectric switch, it is possible to obtain a large change in electrical signal with a small mechanical pressing force, and it is reliable and has high reliability. Can be provided as a switch.
以上のように本考案による圧電スイッチは、表面波圧電
チップをスイッチング素子として使用したものであり、
わずかな操作力で大きな電気信号の変化を得ることがで
きる確実で信頼性の高いスイッチとすることができる。As described above, the piezoelectric switch according to the present invention uses a surface wave piezoelectric chip as a switching element,
It is possible to provide a reliable and highly reliable switch that can obtain a large change in electrical signal with a small operating force.
第１図は本考案の圧電スイッチに使用する表面波圧電チ
ップを示す斜視図、第２図は本考案の一実施例による圧
電スイッチを示す断面図、第３図は同スイッチの電気特
性を示す図である。
１・・・・・・表面波圧電チップ、２・・・・・・圧電
性磁器板、３゜４・・・・・・櫛形電極、７・・・・・
・ケース、９・・・・・・操作板。Fig. 1 is a perspective view showing a surface wave piezoelectric chip used in the piezoelectric switch of the present invention, Fig. 2 is a sectional view showing a piezoelectric switch according to an embodiment of the invention, and Fig. 3 shows the electrical characteristics of the switch. It is a diagram. 1...Surface wave piezoelectric chip, 2...Piezoelectric ceramic plate, 3゜4...Comb-shaped electrode, 7...
・Case, 9...Operation board.
Claims (1)
た表面波圧電チップと、この表面波圧電チップ表面に接
触可能な操作板とを有し、その操作板を押圧して前記表
面波圧電チップの表面に接触させることにより表面波圧
電チップにおける表面波の励受信および伝搬を阻害し、
電気信号の変化を発生させることを特徴とする圧電スイ
ッチ。It has a surface wave piezoelectric chip configured by forming a pair of comb-shaped electrodes on the surface of a piezoelectric ceramic plate, and an operation plate that can come into contact with the surface of the surface wave piezoelectric chip, and presses the operation plate to generate the surface wave. By contacting the surface of the piezoelectric chip, it inhibits the excitation, reception and propagation of surface waves on the surface wave piezoelectric chip,
A piezoelectric switch characterized by generating a change in an electrical signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978009561U JPS5843140Y2 (en) | 1978-01-27 | 1978-01-27 | piezoelectric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978009561U JPS5843140Y2 (en) | 1978-01-27 | 1978-01-27 | piezoelectric switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54113071U JPS54113071U (en) | 1979-08-08 |
| JPS5843140Y2 true JPS5843140Y2 (en) | 1983-09-29 |
Family
ID=28820554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1978009561U Expired JPS5843140Y2 (en) | 1978-01-27 | 1978-01-27 | piezoelectric switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5843140Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5094835A (en) * | 1973-12-14 | 1975-07-28 |
-
1978
- 1978-01-27 JP JP1978009561U patent/JPS5843140Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5094835A (en) * | 1973-12-14 | 1975-07-28 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54113071U (en) | 1979-08-08 |
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