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Keyboard-switch

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Keyboard switch

Details

Inventors: Hanajima, Tadashi; Kato, Tatsuo;
Assignee: Hosiden Electronics Co., Ltd. (Osaka, JP)
Primary Examiner: Pellinen; A. D.
Assistant Examiner: Ginsburg; Morris
Attorney, Agent or Firm: Pollock, Vande Sande and Priddy

A membrane switch sheet is disposed on a base plate and an adhesive layer is formed all over the membrane switch sheet. A positioning sheet, which has positioning holes respectively corresponding to membrane switches arranged on the membrane switch sheet, is disposed on the adhesive layer, and a tact plate having a normally upward curved portion is bonded to the adhesive layer in each positioning hole. A mounting plate is disposed on the positioning sheet at a distance therefrom. The mounting plate has a sleeve at a position corresponding to each tact plate. A stem is slidably received in the sleeve. The stem is capped with a key top formed integrally therewith. An acutating coiled spring is fixed at one end and engaged at the other end with the tact plate. When the key top is depressed, the coiled spring presses down the corresponding membrane switch through the tact plate, turning on the switch. At the same time, the curved portion of the tact plate is flexed downward, producing a click-like touch in response to the keying operation.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a small-sized keyboard switch which employs membrane switches and transmits to the operator's finger a distinctive feeling of actuation.
According to the present invention, a membrane switch sheet having a plurality of membrane switches formed thereon is disposed on a base plate and an adhesive layer is provided all over the membrane switch sheet.
A positioning sheet is disposed on the adhesive layer.
The positioning sheet has positioning holes respectively corresponding to switches of the membrane switch sheet.
A tact plate of a resilient material is positioned in each positioning hole and is bonded at its periphery to the adhesive layer.
A mounting plate is fixed to the base plate in adjacent but spaced relation to the positioning sheet.
The mounting plate has a positioning guide portion formed integrally therewith by which a key corresponding to each tact plate is positioned and guided thereto.
The mounting plate further has a sleeve formed integrally therewith and extending therethrough in opposing relation to each tact plate.
A stem is slidably received in each sleeve.
The stem has a key top molded integrally therewith.
Accordingly, the key top is supported by the mounting plate in a manner to be movable up and down.
On end portion of an actuating coiled spring is put on a spring holder portion of the key top and the other end of the spring is held in contact with the tact plate.
The membrane sheet is made up of two conductor pattern sheets separated by a spacer sandwiched therebetween.
When the key top is pressed down, contact patterns of the conductor pattern sheets are pressed by the actuating coiled spring into contact with each other through the tact plate, performing a switching operation.
At this time, the actuating coiled spring and the tact plate act in cooperation to transmit a click-like feeling to the operator's finger.
A sound by flexure of the tact plate is suppressed by the presence of the adhesive layer, produced a quieting effect

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