Multi-pole momentary membrane switch

Details Multi-pole momentary membrane switch Multi-pole momentary membrane switch

1989-07-21

1991-01-22

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200513, 200275, H01H 100, H01H 1370

Patent

active

049872753

ABSTRACT:
A membrane keyboard is comprised of a dielectric substrate and an overlying deflectable membrane layer separated by a spacer. A plurality of contact poles are located on the dielectric substrate with an electrically conductive common contact area located on the flexible membrane. A portion of the flexible membrane is locally stiffened and, in a preferred embodiment, provided with a ridge extending away from a portion of the membrane towards the contact poles. Upon actuation of the switch, the stiffened portion of the membrane ensures simultaneity of contact between the common contact area on the membrane and the contact poles on the substrate. Preferred embodiments utilize a generally circular ridge in the deflectable membrane cooperating with interdigitated contact poles.

REFERENCES:
patent: 4156802 (1979-05-01), Gilano et al.
patent: 4207443 (1980-06-01), Matsuura
patent: 4463234 (1984-07-01), Bennewitz
patent: 4477700 (1984-10-01), Balash et al.
patent: 4501938 (1985-02-01), Kawauchi
patent: 4508942 (1985-04-01), Inaba

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