Membrane key switch with anti-inversion feature

Details Membrane key switch with anti-inversion feature Membrane key switch with anti-inversion feature

1986-12-19

1988-01-19

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, H01H 1370

Patent

active

047206101

ABSTRACT:
A keyboard matrix switch (10) is provided which features a membrane layer (22) having dimples (30) therein at each key switch site to provide a proper tactile feel upon actuation. Each dimple (30) is provided with a series of ribs (34, 36, 38, FIG. 3) formed in the membrane layer (22) and radiating outwardly from the dimple to preclude overtravel and locking of the dimple in an inverted position (as in FIG. 1).

REFERENCES:
patent: 3684842 (1972-08-01), Boulanger
patent: 3860771 (1975-01-01), Lynn et al.
patent: 3978297 (1976-08-01), Lynn et al.
patent: 3995126 (1976-11-01), Larson
patent: 4066851 (1978-01-01), White et al.
patent: 4286129 (1981-08-01), Petit
patent: 4314116 (1982-02-01), Gordon
patent: 4423294 (1983-12-01), Walser et al.
AMP Keyboards--Your Competitive Edge.

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