Mechanical key switch for a membrane keyboard

Details Mechanical key switch for a membrane keyboard Mechanical key switch for a membrane keyboard

1993-06-21

1994-06-28

Recla, Henry J.

Electricity: circuit makers and breakers

Solid contact

Membrane type

200516, 200520, 200521, H01H 2916

Patent

active

053249020

ABSTRACT:
A mechanical key switch for a membrane keyboard including a key cap supported on an actuating spring member by a compression spring and made to slide on a key body vertically, the actuating spring member having a unitary, arched bridge plate in the middle, which curves inwards to trigger an electrical signal and simultaneously to produce a click sound upon pressing of the key cap against the compression spring, and curves outwards to return the key cap and simultaneously to produce a click sound upon releasing of the key cap.

REFERENCES:
patent: 4241960 (1980-12-01), Hentschel
patent: 4864085 (1989-09-01), Hanajima et al.
patent: 5012055 (1991-04-01), Matsui

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