Keyboard switch

Details Keyboard switch Keyboard switch

1988-09-23

1989-09-05

Pellinen, A. D.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200513, H01H 312

Patent

active

048640859

ABSTRACT:
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.

REFERENCES:
patent: 4678880 (1987-07-01), Koizumi et al.

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