JPH05304007A - Pressure sensitive switch - Google Patents
Pressure sensitive switchInfo
- Publication number
- JPH05304007A JPH05304007A JP10825092A JP10825092A JPH05304007A JP H05304007 A JPH05304007 A JP H05304007A JP 10825092 A JP10825092 A JP 10825092A JP 10825092 A JP10825092 A JP 10825092A JP H05304007 A JPH05304007 A JP H05304007A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- conductive rubber
- sensitive conductive
- sensitive
- resistance value
- 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.)
- Granted
Links
Landscapes
- Push-Button Switches (AREA)
- Adjustable Resistors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、感圧導電ゴムの加圧に
伴う抵抗変化を利用してスイッチング作用を行わせるよ
うにした感圧スイッチに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive switch adapted to perform a switching action by utilizing a resistance change caused by pressurization of a pressure-sensitive conductive rubber.
【０００２】[0002]
【従来の技術】感圧導電ゴムを用いた感圧スイッチとし
て、例えば特開昭５２−５４７７号公報に示されている
ように、感圧導電ゴムにて形成された一方のシート電極
の表面に多数の山形状の突起部を形成する一方、この突
起部が形成されたシート電極の表面に導電布等からなる
他方のシート電極を貼り合わせ、双方の電極を加圧した
場合に、前記突起部の圧縮変形により両電極間の接触面
積が増大するのに伴ってその通電抵抗が急激に小さくな
る性質を利用して、両電極間のスイッチング作用を行わ
せるようにしたものが知られている。2. Description of the Related Art As a pressure-sensitive switch using a pressure-sensitive conductive rubber, for example, as disclosed in Japanese Patent Laid-Open No. 52-5477, a surface of one sheet electrode formed of the pressure-sensitive conductive rubber is used. While forming a large number of mountain-shaped protrusions, when the other sheet electrode made of a conductive cloth or the like is attached to the surface of the sheet electrode on which the protrusions are formed and both electrodes are pressed, the protrusions are formed. It is known that the switching action between both electrodes is performed by utilizing the property that the conduction resistance rapidly decreases as the contact area between both electrodes increases due to the compressive deformation.
【０００３】[0003]
【発明が解決しようとする課題】上記のような従来の感
圧スイッチにおいては、ある程度まで加圧力を増大させ
ると感圧導電ゴムの抵抗値が小さくなる傾向が認められ
るものの、微小な加圧力のもとでは抵抗値が無限大のま
まで何ら変化せず、スイッチング作用を行わせるのに必
要な初期加圧力が比較的大きくなって好ましくない。In the conventional pressure-sensitive switch as described above, when the pressure is increased to some extent, the resistance value of the pressure-sensitive conductive rubber tends to decrease, but a small pressure Originally, the resistance value remains infinite and does not change at all, and the initial pressing force required for performing the switching action is relatively large, which is not preferable.
【０００４】また、従来の構造では、特定の加圧力まで
加圧した場合にその抵抗値が低下したとしても、抵抗値
の低下落差すなわち加圧に伴う抵抗値の低下の度合が小
さくて抵抗値の低下特性が緩慢となり、その低下特性の
ばらつき等を考慮すると感圧スイッチとしての機能を十
分に発揮させることができない。Further, in the conventional structure, even if the resistance value is lowered when the pressure is applied up to a specific pressing force, the difference in the drop in the resistance value, that is, the degree of the decrease in the resistance value due to the pressurization is small and the resistance value is small. The deterioration characteristic of the pressure sensor becomes slow, and the function as the pressure sensitive switch cannot be sufficiently exerted in consideration of the variation of the deterioration characteristic.
【０００５】このようなことから、上記の抵抗値の低下
特性を改善するために、前記突起部の高さを一つ置きに
異ならしめた構造のものが特願平３−２３４５２３号と
して本出願人により提案されているが、このタイプのも
のでは、図４に破線Ａで示すように、先のものよりも急
激な抵抗値の低下特性が認められるものの、抵抗値が低
下し始めてから特定の値で飽和するまでの落差の面で必
ずしも十分でないばかりでなく、その落差を得るための
荷重変化が比較的大きいために実用性の上でなおも課題
を残している。In view of the above, in order to improve the above-mentioned resistance lowering characteristic, a structure in which the heights of the protrusions are made different from each other is the present application as Japanese Patent Application No. 3-234523. Although proposed by a person, in this type, as shown by a broken line A in FIG. 4, although a characteristic of a sudden decrease in resistance value is recognized as compared with the previous one, a specific value is obtained after the resistance value starts to decrease. Not only is it sufficient in terms of the head until the value saturates, but there is still a problem in practical use because the load change to obtain the head is relatively large.
【０００６】本発明は以上のような課題に着目してなさ
れたもので、初期加圧力が小さく、しかも小さい加圧力
変化のなかでより大きな抵抗値の落差が得られるように
した構造を提供しようとするものである。The present invention has been made in view of the above problems, and provides a structure in which the initial pressing force is small and a larger drop of the resistance value can be obtained in a small change of the pressing force. It is what
【０００７】[0007]
【課題を解決するための手段】本発明は、陽極および陰
極のうち少なくとも一方の電極が設けられた基板上に感
圧導電ゴムを配置してなり、この感圧導電ゴムを加圧す
ることにより、該感圧導電ゴム自体の圧縮変形に伴う抵
抗変化によって感圧導電ゴムを可動接点として一方の電
極と他方の電極との間のスイッチング作用を行わせるよ
うにした感圧スイッチであって、前記感圧導電ゴムの無
加圧状態において、この感圧導電ゴムと前記一方の電極
とが非接触となるように感圧導電ゴムを断面逆凹状形状
に形成したことを特徴としている。According to the present invention, a pressure-sensitive conductive rubber is arranged on a substrate provided with at least one electrode of an anode and a cathode, and the pressure-sensitive conductive rubber is pressed to obtain a pressure-sensitive conductive rubber. A pressure-sensitive switch in which the pressure-sensitive conductive rubber itself is used as a movable contact to cause a switching action between one electrode and the other electrode by a resistance change caused by compression deformation of the pressure-sensitive conductive rubber. The pressure-sensitive conductive rubber is characterized in that the pressure-sensitive conductive rubber is formed in a reverse concave shape in cross section so that the pressure-sensitive conductive rubber and the one electrode are not in contact with each other in a non-pressurized state.
【０００８】[0008]
【作用】この構造によると、感圧導電ゴムを断面逆凹状
形状としたことによって、感圧導電ゴム自体がきわめて
撓みやすくなり、感圧導電ゴムを加圧するにしたがって
電極との接触面積を大きくして抵抗値を下げるとする感
圧スイッチの要求特性とも合致する。したがって、電極
に対する感圧導電ゴムの接触面積をより大きく確保で
き、微小な加圧力でも抵抗値が急激に低下するととも
に、加圧力をそれ以上増大させる必要もなくなる。According to this structure, since the pressure-sensitive conductive rubber has an inverted concave cross-section, the pressure-sensitive conductive rubber itself is extremely easily bent, and the contact area with the electrode is increased as the pressure-sensitive conductive rubber is pressed. It also meets the required characteristics of pressure sensitive switches that lower the resistance value. Therefore, a larger contact area of the pressure-sensitive conductive rubber with the electrode can be secured, the resistance value sharply decreases even with a small pressing force, and it is not necessary to further increase the pressing force.
【０００９】[0009]
【実施例】図１，２は本発明の一実施例を示す図で、キ
ーボードスイッチに適用した場合の例を示している。1 and 2 are views showing an embodiment of the present invention, showing an example of application to a keyboard switch.
【００１０】図１，２に示すように、プリント基板１上
には、複数のプラス電極２とマイナス電極３とが互い違
いとなるようにパター印刷により全体としてくし形状に
形成されている。前記プリント基板１の上には双方の電
極２，３を覆うように感圧導電ゴム４がかぶせられ、そ
の感圧導電ゴム４の上には所定曲率の円弧状の押圧面５
ａを有するキートップ５が置かれている。As shown in FIGS. 1 and 2, a plurality of plus electrodes 2 and minus electrodes 3 are formed in a comb shape as a whole on a printed circuit board 1 by pattern printing so that the plus electrodes 2 and the minus electrodes 3 are staggered. A pressure-sensitive conductive rubber 4 is placed on the printed circuit board 1 so as to cover both electrodes 2 and 3, and an arc-shaped pressing surface 5 having a predetermined curvature is placed on the pressure-sensitive conductive rubber 4.
A key top 5 with a is placed.
【００１１】そして、前記感圧導電ゴム４は、無加圧状
態において電極２，３と接触することがないように全体
として断面逆凹状形状に形成されているとともに、その
内下面の中央部には凹陥部６が形成されており、これに
より感圧導電ゴム４の中央部が最も薄肉に形成されてい
る。The pressure-sensitive conductive rubber 4 is formed in an inverted concave cross-section as a whole so as not to come into contact with the electrodes 2 and 3 in a non-pressurized state, and is formed in the central portion of the inner and lower surfaces thereof. The concave portion 6 is formed so that the central portion of the pressure-sensitive conductive rubber 4 is thinnest.
【００１２】したがって、本実施例構造によれば、キー
トップ５を介して感圧導電ゴム４を加圧すると、図３に
示すように感圧導電ゴム４が瞬時につぶれて、少なくと
も複数のプラス電極２，２…のいずれかとマイナス電極
３，３…のいずれかに接触する。Therefore, according to the structure of this embodiment, when the pressure-sensitive conductive rubber 4 is pressed through the key tops 5, the pressure-sensitive conductive rubber 4 is instantly crushed as shown in FIG. .. and any of the negative electrodes 3, 3 ...
【００１３】そして、上記のように感圧導電ゴム４がつ
ぶれて変形すると、プラス電極２とマイナス電極３とが
感圧導電ゴム４を可動接点として単に導通するだけでは
なく、感圧導電ゴム４の変形に伴ってその接触面積が増
大することで感圧導電ゴム４自体の通電抵抗が瞬時のう
ちに急激に低下する。これにより、プラス電極２とマイ
ナス電極３との間に必要な電流が流れてスイッチング作
用が行われる。When the pressure-sensitive conductive rubber 4 is crushed and deformed as described above, the positive electrode 2 and the negative electrode 3 are not merely electrically connected by using the pressure-sensitive conductive rubber 4 as a movable contact, but also the pressure-sensitive conductive rubber 4 is used. The contact area of the pressure-sensitive conductive rubber 4 increases with the deformation of the, and the current-carrying resistance of the pressure-sensitive conductive rubber 4 itself suddenly decreases. As a result, a necessary current flows between the plus electrode 2 and the minus electrode 3 to perform a switching action.
【００１４】図４の実線Ｂは、上記実施例における感圧
導電ゴム４の抵抗値の低下特性を示したもので、無加圧
状態では感圧導電ゴム４の抵抗値が無限大であるのに対
して、加圧するとその加圧力が３０〜４０ｇｆ程度の範
囲内で急激に低下し、それ以上の加圧力では抵抗値の低
下度合が緩慢になるものの４００ｇｆ程度までは緩やか
に低下し、４００ｇｆ以上の加圧力では零に近い抵抗値
で安定化する。A solid line B in FIG. 4 shows the resistance decreasing characteristic of the pressure-sensitive conductive rubber 4 in the above-mentioned embodiment. In the non-pressurized state, the resistance value of the pressure-sensitive conductive rubber 4 is infinite. On the other hand, when the pressure is increased, the applied pressure sharply decreases within the range of about 30 to 40 gf, and if the applied pressure is higher than that, the degree of decrease in the resistance value becomes slow, but the applied pressure gradually decreases to about 400 gf. With the above pressing force, the resistance is stabilized at a resistance value close to zero.
【００１５】つまり、本実施例によれば、微小な加圧力
を加えるだけで感圧導電ゴム４の抵抗値が急激に低下す
ることから初期加圧力が著しく小さくて済み、しかも抵
抗値が一旦低下すればそれ以上加圧力を増やすことなし
にスイッチング作用に必要十分な抵抗値の落差が得られ
ることになる。That is, according to the present embodiment, the resistance value of the pressure-sensitive conductive rubber 4 sharply decreases only by applying a small pressing force, so that the initial pressing force can be remarkably small and the resistance value once decreases. By doing so, a sufficient drop in resistance value necessary for the switching action can be obtained without further increasing the applied pressure.
【００１６】また、感圧導電ゴム４が断面逆凹状形状で
あって無加圧状態では空洞状となっていることから、感
圧導電ゴム４のつぶれ変形によってスイッチング作用時
の節度感も得られる。Further, since the pressure-sensitive conductive rubber 4 has an inverted concave cross-section and is hollow in a non-pressurized state, the pressure-sensitive conductive rubber 4 is crushed and deformed to provide a moderation feeling at the time of switching action. ..
【００１７】なお、上記実施例では、プリント基板１上
に陽陰双方の電極２，３を配置した場合の例を示してい
るが、プリント基板１上には陽陰いずれか一方の電極の
みを配置し、他方の電極を感圧導電ゴム４の上側もしく
は感圧導電ゴム４内に配置してもよい。In the above embodiment, an example in which both positive and negative electrodes 2 and 3 are arranged on the printed circuit board 1 is shown. However, only one of the positive and negative electrodes is arranged on the printed circuit board 1. Alternatively, the other electrode may be disposed above the pressure-sensitive conductive rubber 4 or in the pressure-sensitive conductive rubber 4.
【００１８】[0018]
【発明の効果】以上のように本発明によれば、感圧導電
ゴムを可動接点として用いてこの感圧導電ゴムの加圧に
伴う抵抗変化によりスイッチング作用を行うにあたり、
感圧導電ゴムを断面逆凹状形状に形成したことから、感
圧導電ゴムがきわめてつぶれ変形しやすいものとなっ
て、そのつぶれ変形時の接触面積を大きく確保できるよ
うになり、微小な加圧力を瞬間的に加えるだけで大きな
抵抗値の落差が得られるとともに、一旦抵抗値が低下し
始めるとそれ以上加圧力を増大させる必要もなく、感圧
スイッチとしての感度もしくは応答性が大幅に向上す
る。As described above, according to the present invention, when a pressure-sensitive conductive rubber is used as a movable contact and a switching action is performed by a resistance change caused by pressurization of the pressure-sensitive conductive rubber,
Since the pressure-sensitive conductive rubber is formed in the shape of an inverted concave section, the pressure-sensitive conductive rubber is very easily crushed and deformed, and it is possible to secure a large contact area during the crushed deformation and to apply a small amount of pressure A large drop of the resistance value can be obtained by only momentarily applying the resistance value, and once the resistance value starts to decrease, there is no need to further increase the pressing force, and the sensitivity or responsiveness as the pressure sensitive switch is greatly improved.
【００１９】また、感圧導電ゴムの加圧時にその感圧導
電ゴム自体のつぶれ変形に伴う節度感も得られることか
ら、感圧スイッチの操作性の面でもより良好なものとな
る。Further, since a feeling of moderation due to the crush deformation of the pressure-sensitive conductive rubber itself can be obtained when the pressure-sensitive conductive rubber is pressed, the operability of the pressure-sensitive switch is further improved.
【図１】本発明の一実施例を示す無加圧時の断面図。FIG. 1 is a sectional view showing an embodiment of the present invention when no pressure is applied.
【図２】図１のａ−ａ線に沿う断面図。FIG. 2 is a sectional view taken along line aa of FIG.
【図３】図１に示す感圧スイッチの加圧時の断面図。FIG. 3 is a sectional view of the pressure-sensitive switch shown in FIG. 1 during pressurization.
【図４】上記感圧スイッチの加圧力（荷重）と抵抗値と
の関係を示す特性図。FIG. 4 is a characteristic diagram showing a relationship between a pressure (load) and a resistance value of the pressure sensitive switch.
１…プリント基板 ２…プラス電極 ３…マイナス電極 ４…感圧導電ゴム ５…キートップ 1 ... Printed circuit board 2 ... Positive electrode 3 ... Negative electrode 4 ... Pressure-sensitive conductive rubber 5 ... Key top
Claims (1)
電極が設けられた基板上に感圧導電ゴムを配置してな
り、この感圧導電ゴムを加圧することにより、該感圧導
電ゴム自体の圧縮変形に伴う抵抗変化によって感圧導電
ゴムを可動接点として一方の電極と他方の電極との間の
スイッチング作用を行わせるようにした感圧スイッチで
あって、 前記感圧導電ゴムの無加圧状態において、この感圧導電
ゴムと前記一方の電極とが非接触となるように感圧導電
ゴムを断面逆凹状形状に形成したことを特徴とする感圧
スイッチ。1. A pressure-sensitive conductive rubber is disposed on a substrate provided with at least one of an anode and a cathode, and the pressure-sensitive conductive rubber is compressed to compress the pressure-sensitive conductive rubber itself. A pressure-sensitive switch in which a pressure-sensitive conductive rubber is used as a movable contact to perform a switching action between one electrode and the other electrode by a resistance change due to deformation, wherein the pressure-sensitive conductive rubber is in a non-pressurized state. 2. The pressure-sensitive switch, wherein the pressure-sensitive conductive rubber is formed in an inverted concave cross-section so that the pressure-sensitive conductive rubber and the one electrode are not in contact with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04108250A JP3141046B2 (en) | 1992-04-28 | 1992-04-28 | Pressure switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04108250A JP3141046B2 (en) | 1992-04-28 | 1992-04-28 | Pressure switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05304007A true JPH05304007A (en) | 1993-11-16 |
| JP3141046B2 JP3141046B2 (en) | 2001-03-05 |
Family
ID=14479898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04108250A Expired - Fee Related JP3141046B2 (en) | 1992-04-28 | 1992-04-28 | Pressure switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3141046B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6184866B1 (en) | 1997-09-29 | 2001-02-06 | Varatouch Technology Incorporated | Pointing device |
| US6313826B1 (en) | 1998-04-07 | 2001-11-06 | Varatouch Technology Incorporated | Pointing device with non-spring return mechanism |
| JP2002131155A (en) * | 2000-10-30 | 2002-05-09 | Denso Corp | Pressure sensitive resistance sensor |
| US6404323B1 (en) | 1999-05-25 | 2002-06-11 | Varatouch Technology Incorporated | Variable resistance devices and methods |
| US7190251B2 (en) | 1999-05-25 | 2007-03-13 | Varatouch Technology Incorporated | Variable resistance devices and methods |
| JP2008527620A (en) * | 2005-01-03 | 2008-07-24 | ノキア コーポレイション | Mobile phone with shiftable keypad |
| US9081426B2 (en) | 1992-03-05 | 2015-07-14 | Anascape, Ltd. | Image controller |
-
1992
- 1992-04-28 JP JP04108250A patent/JP3141046B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9081426B2 (en) | 1992-03-05 | 2015-07-14 | Anascape, Ltd. | Image controller |
| US6184866B1 (en) | 1997-09-29 | 2001-02-06 | Varatouch Technology Incorporated | Pointing device |
| US6313826B1 (en) | 1998-04-07 | 2001-11-06 | Varatouch Technology Incorporated | Pointing device with non-spring return mechanism |
| US6404323B1 (en) | 1999-05-25 | 2002-06-11 | Varatouch Technology Incorporated | Variable resistance devices and methods |
| US7190251B2 (en) | 1999-05-25 | 2007-03-13 | Varatouch Technology Incorporated | Variable resistance devices and methods |
| JP2002131155A (en) * | 2000-10-30 | 2002-05-09 | Denso Corp | Pressure sensitive resistance sensor |
| JP2008527620A (en) * | 2005-01-03 | 2008-07-24 | ノキア コーポレイション | Mobile phone with shiftable keypad |
| US7671836B2 (en) | 2005-01-03 | 2010-03-02 | Nokia Corporation | Cell phone with shiftable keypad |
| JP4638508B2 (en) * | 2005-01-03 | 2011-02-23 | ノキア コーポレイション | Mobile phone with shiftable keypad |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3141046B2 (en) | 2001-03-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |