JP4514366B2

JP4514366B2 - Pushbutton switch member

Info

Publication number: JP4514366B2
Application number: JP2001176967A
Authority: JP
Inventors: 正大久間
Original assignee: Shin Etsu Polymer Co Ltd
Current assignee: Shin Etsu Polymer Co Ltd
Priority date: 2001-06-12
Filing date: 2001-06-12
Publication date: 2010-07-28
Anticipated expiration: 2021-06-12
Also published as: JP2002367476A

Description

【０００１】
【発明の属する技術分野】
この発明は、計測機器、車載用電子機器、移動体通信機器又はパーソナルコンピュータ等の各種電子機器の入力装置に使用される押釦スイッチに関し、詳しくは、操作キー部の許容押圧荷重を要求に応じて選択的に調整できるようにした押釦スイッチ用部材に関するものである。
【０００２】
【従来の技術】
従来、この種の押釦スイッチに使用される押釦スイッチ用部材としては、図４に示したように、回路基板３１上に配置されたメンブレンスイッチ３２の上に、操作キー部３３を弾性変形可能なドーム状の薄肉壁３４を介してベースシート３５に一体に形成された押釦シート部材３６を固定したものが知られている。
【０００３】
この従来の押釦スイッチ用部材にあっては、操作キー部３３を回路基板３１側へ押圧すると、押釦シート部材３６の薄肉壁３４が回路基板３１側に弾性変形して押圧突部３７がメンブレンスイッチ３２の外表面に接触したまま可動接点３８を押し下げて、ついには可動接点３８が固定接点３９に接触して当該スイッチ機能が働くことになる。そこで、操作キー部３３に与えていた押圧力を除くと、薄肉壁３４が弾性復元して操作キー部３３が元の位置に戻ることで、繰り返し使用できるものであった。
【０００４】
【発明が解決しようとする課題】
しかしながら、この従来の押釦スイッチ用部材にあっては、操作キー部３３の許容押圧荷重は押釦シート部材３６の材質と薄肉壁３４の形状によって決定されるため、各操作キー部３３毎に許容押圧荷重を変えたいとの要求に対しては、１枚のシートに複数の操作キー部３３を設けた押釦シート部材３６については、キー操作部３３毎に薄肉壁３４の形状を変更しなければならず、その設計が面倒なものとなっていた。
【０００５】
そこで、この発明は、以上のような従来の押釦スイッチ用部材の問題点を解決するために考えられたものであって、ほぼ同じ大きさをした操作キー部を有する２つの押釦シート部材を重ね合わせることで、許容押圧荷重が異なる押釦スイッチ用部材を容易に提供できるようにすることを課題としている。
【０００６】
【課題を解決するための手段】
かかる課題を達成するため、請求項１に記載の発明は、外部からの押圧力に抗して弾性復元力を発生するように設計された少なくとも１つの操作キー部を有する第１押釦シート部材の外側に、外部からの押圧力に抗して弾性復元力を発生するように設計された少なくとも１つの前記第１押釦シート部材の操作キー部とほぼ同じ大きさの操作キー部を有する第２押釦シート部材を積層した押釦スイッチ用部材において、前記第１押釦シート部材と前記第２押釦シート部材の操作キー部は前記ドーム状の薄肉壁から上方に突出した形状であって、前記第２押釦シート部材の操作キー部の裏面の平坦部を前記第１押釦シート部材の操作キー部の天面とを接触させた状態で前記第１押釦シート部材の薄肉壁と前記第２押釦シート部材の薄肉壁との間に空間が形成されるようにしていることを特徴としている。
【０００７】
請求項２に記載の発明は、請求項１の構成に加えて、前記第１押釦シート部材と前記第２押釦シート部材の操作キー部の裏面には、可動接点を固定接点へ押圧するための押圧突部が設けられており、前記第１押釦シート部材と前記第２押釦シート部材の操作キー部の天面には、前記押圧突部が入る凹部が形成されていることを特徴としている。
【０００８】
請求項３に記載の発明は、請求項１又は２の構成に加えて、前記第１押釦シート部材の操作キー部の許容押圧荷重と前記第２押釦シート部材の操作キー部の許容押圧荷重とが異なっていることを特徴としている。
【０００９】
【発明の実施の形態】
以下、この発明の実施の形態を図面を用いて説明する。
【００１０】
［発明の実施の形態１］
図１は、この発明の実施の形態１に係る押釦スイッチ用部材の要部断面図である。
【００１１】
まず、この発明の実施の形態１に係る押釦スイッチ用部材の構成について説明する。
【００１２】
固定基板１の上には、回路基板１側に配置される固定側フィルム２に固定接点３を設け、この固定接点３と対向して僅かな距離を置いて配置される可動接点４を設けた可動側フィルム５とがスペーサ６を介して一体に形成されたメンブレンスイッチ７が取り付けられている。メンブレンスイッチ７の外側には、第１押釦シート部材８が取り付けられている。第１押釦シート部材８は、外部からの押圧力に抗して弾性復元力を発生するように、操作キー部９を弾性変形可能なドーム状の薄肉壁１０を介してベースシート１１に一体に形成している。そして、メンブレンスイッチ７内の可動接点４をメンブレンスイッチ７内の固定接点３に接触させる方向に押圧するために、操作キー部９の裏面に、メンブレンスイッチ７の可動側フィルム５の外表面に接触できる押圧突部１２が設けられている。
【００１３】
第１押釦シート部材８の外側には、外部からの押圧力に抗して弾性復元力を発生するように、操作キー部１３を弾性変形可能なドーム状の薄肉壁１４を介してベースシート部１５に一体に形成した第２押釦シート部材１６が取り付けられている。
【００１４】
図１に示した実施の形態１では、第２押釦シート部材１６の操作キー部１３は第１押釦シート部材８の操作キー部９とほぼ同じ大きさとしており、操作キー部１３の裏面の平坦部が操作キー部９の天面と接触している。これにより、第１押釦シート部材８の操作キー部９と第２押釦シート部材１６の操作キー部１３とを重ね合わせた２重操作キー部が完成する。ここで、第１押釦シート部材８の操作キー部９と第２押釦シート部材１６の操作キー部１３の裏面に押圧突部１２を設けると共に、第１押釦シート部材８の操作キー部９と第２押釦シート部材１６の操作キー部１３の天面に押圧突部１２が入る凹部１７を形成すれば、第１押釦シート部材８の操作キー部９と第２押釦シート部材１６の操作キー部１３を同じ形状とでき、製作が容易となる。
【００１５】
以下、この発明の実施の形態１に係る押釦スイッチ用部材の作用について説明する。
【００１６】
押釦スイッチの押釦１８を押圧すると、第２押釦シート部材１６の操作キー部１３が回路基板１側へ押圧され、第２押釦シート部材１６の薄肉壁１４が回路基板１側に弾性変形する。このとき、第２押釦シート部材１６の操作キー部１３の裏面は第１押釦シート部材８の操作キー部９の天面と接触しているから、第２押釦シート部材１６の操作キー部１３の動きに合わせて第１押釦シート部材８の操作キー部９が回路基板１側へ押圧され、第１押釦シート部材８の薄肉壁１０が回路基板１側に弾性変形する。したがって、押釦１８に作用する外部の押圧力に対する許容押圧荷重は、第１押釦シート部材８の操作キー部９の許容押圧荷重と第２押釦シート部材１６の操作キー部１３の許容押圧荷重との和となる。
【００１７】
そして、第１押釦シート部材８の裏面の押圧突部１２がメンブレンスイッチ７の外表面に接触したまま可動接点４を押し下げて、ついには可動接点４が固定接点３に接触して当該スイッチ機能が働くことになる。そこで、第２押釦シート部材１６の操作キー部１３に与えていた押圧力を除くと、第２押釦シート部材１６の薄肉壁１４と第１押釦シート部材８の薄肉壁１０が弾性復元して、第２押釦シート部材１６の操作キー部１３と第１押釦シート部材８の操作キー部９とが元の位置に戻る。
【００１８】
実施の形態１に係る押釦スイッチ用部材は、以上のような動作を繰り返すことで目的とする押釦スイッチの機能が実現できる。
【００１９】
なお、実施の形態１において、第１押釦シート部材８の操作キー部９の許容押圧荷重と第２押釦シート部材１６の操作キー部１３との許容押圧荷重を異なる設計とし、これらを組み合わせることで各種の許容押圧荷重の操作キー部を有する押釦スイッチ用部材を実現することができる。
【００２０】
例えば、第１押釦シート部材８の操作キー部９の許容押圧荷重を５００ｇとし、第２押釦シート部材１６の操作キー部１３の許容押圧荷重を３００ｇとした場合には、実施の形態１では許容押圧荷重が８００ｇ（５００ｇ＋３００ｇ）となる。
【００２１】
［発明の実施の形態２］
図２は、この発明の実施の形態２に係る押釦スイッチ用部材の要部断面図である。
【００２２】
まず、この発明の実施の形態２に係る押釦スイッチ用部材の構成について説明する。
【００２３】
実施の形態２に係る押釦スイッチ用部材では、回路基板１の上に設けられた固定接点３に対応する位置に、外部からの押圧力に抗して弾性復元力を発生するように、操作キー部９を弾性変形可能なドーム状の薄肉壁１０を介してベースシート部１１に一体に形成した第１押釦シート部材８が取り付けられている。操作キー部９の裏面には、押圧突部１２が設けられており、この押圧突部１２には可動接点４となる逆椀状の導電性付勢部材が固着されている。
【００２４】
操作キー部９の外側には、操作キー部９の天面に接する平坦な裏面を有する嵌合凹部２１が形成された押釦カバー部材２２が取り付けられている。押釦カバー部材２２は、外部からの押圧力に抗して弾性復元力を発生するように、操作キー部２３を弾性変形可能なドーム状の薄肉壁２４を介してベースシート部２５に一体に形成しており、操作キー部２３を外方に突出した形状を呈している。押釦カバー部材２２は、操作キー部２３の嵌合凹部２１の裏面に第１押釦シート部材８の操作キー部９の天面を接触させるように嵌合して、ベースシート部２５を第１押釦シート部材８の表面に接着している。
【００２５】
以下、この発明の実施の形態２に係る押釦スイッチ用部材の作用について説明する。
【００２６】
押釦スイッチの押釦１８を押圧すると、押釦カバー部材２２の操作キー部２３が回路基板１側へ押圧され、押釦カバー部材２２の薄肉壁２４が回路基板１側に弾性変形する。このとき、押釦カバー部材２２の操作キー部２３の裏面は第１押釦シート部材８の操作キー部９の天面と接触しているから、押釦カバー部材２２の操作キー部２３の動きに合わせて第１押釦シート部材８の操作キー部９が回路基板１側へ押圧され、第１押釦シート部材８の薄肉壁１０が回路基板１側に弾性変形する。ここで、押釦カバー部材２２のベースシート部２５は第１押釦シート部材８を介して固定基板１で支えられているので、押釦１８に作用する外部の許容押圧荷重に対する許容押圧荷重は、第１押釦シート部材８の操作キー部９の許容押圧荷重と押釦カバー部材２２の操作キー部２３の許容押圧荷重との和となる。
【００２７】
そして、第１押釦シート部材８の裏面の押圧突部１２が可動接点４である逆椀状の導電性付勢部材の頂部に接触したまま可動接点４を押し下げて、ついには可動接点４の頂部の内面が固定接点３に接触して当該スイッチ機能が働くことになる。そこで、押釦カバー部材２２の操作キー部２３に与えていた押圧力を除くと、押釦カバー部材２２の薄肉壁２４と第１押釦シート部材８の薄肉壁１０が弾性復元して、押釦カバー部材２２の操作キー部２３と第１押釦シート部材８の操作キー部９とが元の位置に戻る。
【００２８】
実施の形態２に係る押釦スイッチ用部材は、以上のような動作を繰り返すことで目的とする押釦スイッチの機能が実現できる。
【００２９】
実施の形態２によれば、第１押釦シート部材８の所望の操作キー部９にのみ押釦カバー部材２２を取り付けることができるので、目的とする操作キー部９の許容押圧荷重を差し引いた許容押圧荷重からなる押釦カバー部材２２の操作キー部２３を付加することで、目的とする許容押圧荷重を有する押釦１８を容易に実現することができる。
【００３０】
なお、上述した実施の形態１又は２にあっては、操作キー部９，１３，２３の形状を弾性変形可能なドーム状の薄肉壁１０，１４，２４を介してベースシート部１１，１５，２１に一体に形成したものとして説明したが、操作キー部９，１３，２３は、押釦１８に外部から押圧力が作用したときに固定基板１側に弾性変形でき、その押圧力が解除されたときに元の位置に弾性復元できるものであればよく、例えば薄肉壁１０，１４，２４を水平なものとしてベースシート部１１，１５，２１と同一平面となる形態であっても問題はない。
【００３１】
また、実施の形態１又は２はそれぞれ別個の押釦スイッチ用部材に適用してもよいし、１つの押釦スイッチ用部材にそれらを２つ又は３つ適用することも自由である。
【００３２】
さらにまた、固定接点３と可動接点４との組合せは、実施の形態１又は２に示した両者を一体に組み合わせたメンブレンスイッチ７や、実施の形態３に示した回路基板１に設けた固定接点３と逆椀状の導電性付勢部材からなる可動接点４との組合せに限られることはなく、固定接点３と可動接点４とによってスイッチング回路を形成できるものであればよく、例えば回路基板１に設けた固定接点３と押圧突部１２の先端に導電性インクを印刷して可動接点４を形成した組合せでもよい。
【００３３】
【発明の効果】
以上説明したように、請求項１に記載の発明によれは、外部からの押圧力に抗して弾性復元力を発生するように設計された少なくとも１つの操作キー部を有する第１押釦シート部材の外側に、外部からの押圧力に抗して弾性復元力を発生するように設計された少なくとも１つの第１押釦シート部材の操作キー部とほぼ同じ大きさの操作キー部を有する第２押釦シート部材を積層した押釦スイッチ用部材において、第１押釦シート部材と第２押釦シート部材の操作キー部はドーム状の薄肉壁から上方に突出した形状であって、第２押釦シート部材の操作キー部の裏面の平坦部を第１押釦シート部材の操作キー部の天面とを接触させた状態で第１押釦シート部材の薄肉壁と第２押釦シート部材の薄肉壁との間に空間が形成されるようにしているので、２重操作キー部では第１押釦シート部材の操作キー部の許容押圧荷重と第２押釦シート部材の操作キー部の許容押圧荷重との和が許容押圧荷重となるため、金属製バネ等の別部品を組み込まなくとも、単にほぼ同じ大きさをした操作キー部を有する２つの押釦シート部材を重ね合わせることで、許容押圧荷重が異なる押釦スイッチ用部材を容易に提供することができる。
【００３４】
請求項２に記載の発明によれば、第１押釦シート部材と第２押釦シート部材の操作キー部の裏面には、可動接点を固定接点へ押圧するための押圧突部が設けられており、第１押釦シート部材と第２押釦シート部材の操作キー部の天面には、押圧突部が入る凹部が形成されているので、請求項１の効果に加えて、第１押釦シート部材の操作キー部と第２押釦シート部材の操作キー部を同じ形状とでき、製作が容易となる。
【００３５】
請求項３に記載の発明によれば、第１押釦シート部材の操作キー部の許容押圧荷重と第２押釦シート部材の操作キー部の許容押圧荷重とが異なっているので、請求項１又は２の効果に加えて、第１押釦シート部材の操作キー部の許容押圧荷重と第２押釦シート部材の操作キー部の許容押圧荷重との和からなる各種の許容押圧荷重が実現できる押釦スイッチ用部材が得られる。
【図面の簡単な説明】
【図１】この発明の実施の形態１に係る押釦スイッチ用部材の要部断面図である。
【図２】同実施の形態２に係る押釦スイッチ用部材の要部断面図である。
【図３】従来の押釦スイッチ用部材の要部断面図である。
【符号の説明】
１回路基板
３固定接点
４可動接点
７メンブレンスイッチ
８第１押釦シート部材
９，１３，２３操作キー部
１０，１４，２４薄肉壁
１６第２押釦シート部材
２２押釦カバー部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pushbutton switch used for an input device of various electronic devices such as a measuring device, an in-vehicle electronic device, a mobile communication device, or a personal computer, and more specifically, according to a request for an allowable pressing load of an operation key unit. The present invention relates to a pushbutton switch member that can be selectively adjusted.
[0002]
[Prior art]
Conventionally, as a push button switch member used for this type of push button switch, as shown in FIG. 4, the operation key portion 33 can be elastically deformed on a membrane switch 32 arranged on the circuit board 31. A device in which a push button sheet member 36 formed integrally with a base sheet 35 is fixed via a dome-shaped thin wall 34 is known.
[0003]
In this conventional push button switch member, when the operation key portion 33 is pressed toward the circuit board 31 side, the thin wall 34 of the push button sheet member 36 is elastically deformed toward the circuit board 31 side, and the pressing protrusion 37 becomes the membrane switch. The movable contact 38 is pushed down while being in contact with the outer surface of 32, and finally the movable contact 38 comes into contact with the fixed contact 39 so that the switch function is activated. Therefore, when the pressing force applied to the operation key portion 33 is removed, the thin wall 34 is elastically restored and the operation key portion 33 returns to the original position, so that it can be used repeatedly.
[0004]
[Problems to be solved by the invention]
However, in this conventional push button switch member, since the allowable pressing load of the operation key portion 33 is determined by the material of the push button sheet member 36 and the shape of the thin wall 34, the allowable pressing load for each operation key portion 33. In response to a request to change the load, the shape of the thin wall 34 must be changed for each key operation unit 33 for the push button sheet member 36 provided with a plurality of operation key units 33 on one sheet. The design was troublesome.
[0005]
Accordingly, the present invention has been conceived in order to solve the above-described problems of the conventional push button switch member, in which two push button sheet members having operation key portions having substantially the same size are overlapped. By combining them, it is an object to be able to easily provide members for push button switches having different allowable pressing loads.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is a first pushbutton sheet member having at least one operation key portion designed to generate an elastic restoring force against an external pressing force. A second pushbutton having an operation key portion on the outside that is substantially the same size as the operation key portion of the at least one first pushbutton sheet member designed to generate an elastic restoring force against an external pressing force In the pushbutton switch member in which the sheet members are laminated, the operation key portions of the first pushbutton sheet member and the second pushbutton sheet member have a shape protruding upward from the dome-shaped thin wall, and the second pushbutton sheet The thin wall of the first push button sheet member and the thin wall of the second push button sheet member in a state where the flat part of the back surface of the operation key part of the member is in contact with the top surface of the operation key part of the first push button sheet member Between During it is characterized in that is to be formed.
[0007]
According to a second aspect of the present invention, in addition to the configuration of the first aspect, the movable contact is pressed against the fixed contact on the back surfaces of the operation key portions of the first pushbutton sheet member and the second pushbutton sheet member. A pressing protrusion is provided, and a concave portion for receiving the pressing protrusion is formed on the top surface of the operation key portion of the first pushbutton sheet member and the second pushbutton sheet member.
[0008]
According to a third aspect of the present invention, in addition to the configuration of the first or second aspect , the allowable pressing load of the operation key portion of the first pushbutton sheet member and the allowable pressing load of the operation key portion of the second pushbutton sheet member Are different.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
Embodiment 1 of the Invention
1 is a cross-sectional view of a main part of a pushbutton switch member according to Embodiment 1 of the present invention.
[0011]
First, the structure of the pushbutton switch member according to the first embodiment of the present invention will be described.
[0012]
On the fixed substrate 1, a fixed contact 3 is provided on a fixed film 2 disposed on the circuit substrate 1 side, and a movable contact 4 disposed at a slight distance opposite to the fixed contact 3 is provided. A membrane switch 7 in which the movable film 5 is integrally formed with a spacer 6 is attached. A first push button sheet member 8 is attached to the outside of the membrane switch 7. The first push button sheet member 8 is integrated with the base sheet 11 via a dome-shaped thin wall 10 capable of elastically deforming the operation key portion 9 so as to generate an elastic restoring force against an external pressing force. Forming. Then, in order to press the movable contact 4 in the membrane switch 7 in a direction in which the movable contact 4 is brought into contact with the fixed contact 3 in the membrane switch 7, the back surface of the operation key portion 9 is contacted with the outer surface of the movable film 5 of the membrane switch 7. A pressing protrusion 12 is provided.
[0013]
A base sheet portion is provided outside the first push button sheet member 8 via a dome-shaped thin wall 14 that can elastically deform the operation key portion 13 so as to generate an elastic restoring force against an external pressing force. A second push-button sheet member 16 formed integrally with 15 is attached.
[0014]
In the first embodiment shown in FIG. 1, the operation key portion 13 of the second push button sheet member 16 is substantially the same size as the operation key portion 9 of the first push button sheet member 8, and the back surface of the operation key portion 13 is flat. The portion is in contact with the top surface of the operation key portion 9 . As a result, a double operation key portion in which the operation key portion 9 of the first push button sheet member 8 and the operation key portion 13 of the second push button sheet member 16 are overlapped is completed. Here, the pressing protrusion 12 is provided on the back surface of the operation key portion 9 of the first pushbutton sheet member 8 and the operation key portion 13 of the second pushbutton sheet member 16, and the operation key portion 9 of the first pushbutton sheet member 8 and the second If the concave portion 17 into which the pressing protrusion 12 enters is formed on the top surface of the operation key portion 13 of the two push button sheet member 16, the operation key portion 9 of the first push button sheet member 8 and the operation key portion 13 of the second push button sheet member 16. Can be made the same shape and can be easily manufactured.
[0015]
The operation of the push button switch member according to the first embodiment of the present invention will be described below.
[0016]
When the pushbutton 18 of the pushbutton switch is pressed, the operation key portion 13 of the second pushbutton sheet member 16 is pressed toward the circuit board 1, and the thin wall 14 of the second pushbutton sheet member 16 is elastically deformed toward the circuit board 1 side. At this time, since the back surface of the operation key portion 13 of the second push button sheet member 16 is in contact with the top surface of the operation key portion 9 of the first push button sheet member 8, the operation key portion 13 of the second push button sheet member 16 is contacted. In accordance with the movement, the operation key portion 9 of the first push button sheet member 8 is pressed toward the circuit board 1, and the thin wall 10 of the first push button sheet member 8 is elastically deformed toward the circuit board 1. Accordingly, the allowable pressing load for the external pressing force acting on the push button 18 is the allowable pressing load of the operation key portion 9 of the first push button sheet member 8 and the allowable pressing load of the operation key portion 13 of the second push button sheet member 16. Become sum.
[0017]
Then, the movable contact 4 is pushed down while the pressing protrusion 12 on the back surface of the first push button sheet member 8 is in contact with the outer surface of the membrane switch 7, and finally the movable contact 4 comes into contact with the fixed contact 3 to perform the switch function. Will work. Therefore, when the pressing force applied to the operation key portion 13 of the second push button sheet member 16 is removed, the thin wall 14 of the second push button sheet member 16 and the thin wall 10 of the first push button sheet member 8 are elastically restored, The operation key portion 13 of the second push button sheet member 16 and the operation key portion 9 of the first push button sheet member 8 return to their original positions.
[0018]
The member for a push button switch according to the first embodiment can realize the intended function of the push button switch by repeating the above operation.
[0019]
In the first embodiment, the allowable pressing load of the operation key portion 9 of the first push button sheet member 8 and the allowable pressing load of the operation key portion 13 of the second push button sheet member 16 are different designs, and these are combined. It is possible to realize a push button switch member having operation key portions with various allowable pressing loads.
[0020]
For example, in the case where the allowable pressing load of the operation key portion 9 of the first pushbutton sheet member 8 is 500 g and the allowable pressing load of the operation key portion 13 of the second pushbutton sheet member 16 is 300 g, it is allowable in the first embodiment. The pressing load is 800 g (500 g + 300 g).
[0021]
[Embodiment 2 of the Invention]
FIG. 2 is a cross-sectional view of a main part of a push button switch member according to Embodiment 2 of the present invention.
[0022]
First, the structure of the pushbutton switch member according to Embodiment 2 of the present invention will be described.
[0023]
In the pushbutton switch member according to the second embodiment, the operation key is generated at a position corresponding to the fixed contact 3 provided on the circuit board 1 so as to generate an elastic restoring force against an external pressing force. A first push button sheet member 8 formed integrally with the base sheet portion 11 is attached via a dome-shaped thin wall 10 capable of elastically deforming the portion 9. A pressing protrusion 12 is provided on the back surface of the operation key portion 9, and an inverted hook-shaped conductive urging member serving as the movable contact 4 is fixed to the pressing protrusion 12.
[0024]
A push button cover member 22 having a fitting recess 21 having a flat back surface in contact with the top surface of the operation key portion 9 is attached to the outside of the operation key portion 9. The push button cover member 22 is formed integrally with the base sheet portion 25 via a dome-shaped thin wall 24 that can be elastically deformed so as to generate an elastic restoring force against an external pressing force. The operation key portion 23 has a shape protruding outward. The push button cover member 22 is fitted so that the top surface of the operation key portion 9 of the first push button sheet member 8 is brought into contact with the back surface of the fitting recess 21 of the operation key portion 23, and the base sheet portion 25 is moved to the first push button. The sheet member 8 is bonded to the surface.
[0025]
The operation of the pushbutton switch member according to Embodiment 2 of the present invention will be described below.
[0026]
When the pushbutton 18 of the pushbutton switch is pressed, the operation key portion 23 of the pushbutton cover member 22 is pressed toward the circuit board 1 side, and the thin wall 24 of the pushbutton cover member 22 is elastically deformed toward the circuit board 1 side. At this time, the back surface of the operation key portion 23 of the push button cover member 22 is in contact with the top surface of the operation key portion 9 of the first push button sheet member 8, so that it matches the movement of the operation key portion 23 of the push button cover member 22. The operation key portion 9 of the first push button sheet member 8 is pressed to the circuit board 1 side, and the thin wall 10 of the first push button sheet member 8 is elastically deformed to the circuit board 1 side. Here, since the base sheet portion 25 of the push button cover member 22 is supported by the fixed substrate 1 via the first push button sheet member 8, the allowable pressing load with respect to the external allowable pressing load acting on the push button 18 is the first. This is the sum of the allowable pressing load of the operation key portion 9 of the push button sheet member 8 and the allowable pressing load of the operation key portion 23 of the push button cover member 22.
[0027]
Then, the movable contact 4 is pushed down while the pressing protrusion 12 on the back surface of the first pushbutton sheet member 8 is in contact with the top of the reverse saddle-shaped conductive biasing member that is the movable contact 4, and finally the top of the movable contact 4. The inner surface of the switch contacts the fixed contact 3, and the switch function works. Therefore, when the pressing force applied to the operation key portion 23 of the push button cover member 22 is removed, the thin wall 24 of the push button cover member 22 and the thin wall 10 of the first push button sheet member 8 are elastically restored, and the push button cover member 22 is restored. The operation key portion 23 and the operation key portion 9 of the first push button sheet member 8 return to their original positions.
[0028]
The member for a push button switch according to the second embodiment can realize the intended function of the push button switch by repeating the above operation.
[0029]
According to the second embodiment, since the push button cover member 22 can be attached only to the desired operation key portion 9 of the first push button sheet member 8, the allowable pressure obtained by subtracting the allowable pressure load of the target operation key portion 9. By adding the operation key portion 23 of the push button cover member 22 composed of a load, the push button 18 having a target allowable pressing load can be easily realized.
[0030]
In the first or second embodiment described above, the base sheet portions 11, 15, 24 are provided via the dome-shaped thin walls 10, 14, 24 that can elastically deform the shape of the operation key portions 9, 13, 23 . The operation key portions 9, 13, and 23 can be elastically deformed to the fixed substrate 1 side when a pressing force is applied to the push button 18 from the outside, and the pressing force is released. There is no problem even if the thin wall 10, 14, 24 is horizontal and is in the same plane as the base sheet portions 11, 15, 21.
[0031]
The first or second embodiment may be applied to separate push button switch members, or two or three of them may be applied to one push button switch member.
[0032]
Furthermore, the combination of the fixed contact 3 and the movable contact 4 is the membrane switch 7 in which the two shown in the first or second embodiment are combined together or the fixed contact provided on the circuit board 1 shown in the third embodiment. 3 is not limited to the combination of the movable contact 4 made of a reverse urging-like conductive biasing member, and any combination is possible as long as a switching circuit can be formed by the fixed contact 3 and the movable contact 4. A combination in which the movable contact 4 is formed by printing conductive ink on the tip of the fixed contact 3 and the pressing protrusion 12 provided on the contact point may be used.
[0033]
【The invention's effect】
As described above, according to the first aspect of the present invention, the first push button sheet member having at least one operation key portion designed to generate an elastic restoring force against an external pressing force. A second pushbutton having an operation key portion on the outside of which is substantially the same size as the operation key portion of at least one first pushbutton sheet member designed to generate an elastic restoring force against an external pressing force In the pushbutton switch member in which the sheet members are stacked, the operation key portions of the first pushbutton sheet member and the second pushbutton sheet member have a shape protruding upward from the dome-shaped thin wall, and the operation keys of the second pushbutton sheet member A space is formed between the thin wall of the first push button sheet member and the thin wall of the second push button sheet member with the flat part of the back surface of the part in contact with the top surface of the operation key part of the first push button sheet member I'm trying to In the double operation key portion, the sum of the allowable pressing load of the operation key portion of the first push button sheet member and the allowable pressing load of the operation key portion of the second push button sheet member is an allowable pressing load. Even if no separate parts are incorporated, it is possible to easily provide push button switch members having different allowable pressing loads by simply superimposing two push button sheet members having operation key portions having substantially the same size.
[0034]
According to the second aspect of the present invention, the back surface of the operation key portion of the first push button sheet member and the second push button sheet member is provided with a pressing protrusion for pressing the movable contact to the fixed contact. In addition to the effect of claim 1, in addition to the effect of the first push button sheet member, the top surface of the operation key portion of the first push button sheet member and the second push button sheet member is formed with a recess into which the push protrusion is inserted. The key portion and the operation key portion of the second push button sheet member can have the same shape, which facilitates manufacture.
[0035]
According to the invention of claim 3, since the permissible pressure load of the operation key portions of the first push button seat member and permissible pressure load of the operation key portions of the second push button seat member is different, according to claim 1 or 2 In addition to the effect of the above , a member for a push button switch capable of realizing various allowable pressing loads composed of the sum of the allowable pressing load of the operation key portion of the first push button sheet member and the allowable pressing load of the operation key portion of the second push button sheet member Is obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a pushbutton switch member according to Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view of a main part of a member for a push button switch according to the second embodiment.
FIG. 3 is a cross-sectional view of a main part of a conventional push button switch member.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Circuit board 3 Fixed contact 4 Movable contact 7 Membrane switch 8 1st push button sheet member 9, 13, 23 Operation key part 10, 14, 24 Thin wall 16 2nd push button sheet member 22 Push button cover member

Claims

On the outer side of the first push button sheet member having at least one operation key portion designed to generate an elastic restoring force against an external pressing force, an elastic restoring force against the external pressing force is provided. In the pushbutton switch member in which the second pushbutton sheet member having the operation key portion having the same size as the operation key portion of the at least one first pushbutton sheet member designed to be generated is laminated, the first pushbutton sheet The operation key part of the member and the second push button sheet member has a shape protruding upward from the dome-shaped thin wall, and the flat part on the back surface of the operation key part of the second push button sheet member is the first push button sheet. A space is formed between the thin wall of the first push button sheet member and the thin wall of the second push button sheet member in a state in which the top surface of the operation key portion of the member is in contact with the thin key wall. Push button Switch member.

On the back surfaces of the operation key portions of the first pushbutton sheet member and the second pushbutton sheet member, a pressing protrusion for pressing the movable contact to the fixed contact is provided, and the first pushbutton sheet member and the first pushbutton sheet member 2. The member for a push button switch according to claim 1, wherein a concave portion into which the pressing protrusion is inserted is formed on a top surface of the operation key portion of the two push button sheet member.

3. The push button switch according to claim 1 , wherein an allowable pressing load of the operation key portion of the first push button sheet member is different from an allowable pressing load of the operation key portion of the second push button sheet member . Element.