Membrane switch with improved actuation sensitivity

Details Membrane switch with improved actuation sensitivity Membrane switch with improved actuation sensitivity

1996-05-13

1998-06-09

Tolin, Gerald P.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200292, 200512, 340665, H01H 1370

Patent

active

057638403

ABSTRACT:
A membrane switch including a plurality of upper dot-pads and a plurality of lower dot-pads is provided to enhance the operational sensitivity while avoiding unexpexted actuation of membrane switch is provided. The plurality of upper dot-pads are provided during the print process of the top switch-pad and distributed to surround the top switch-pad. A plurality of lower dot-pads corresponding the plurality of upper dot-pads are provided during the print process of the bottom switch-pad and distributed to surround the bottom switch-pad. Each of the plurality of upper dot-pads has a lower-edge and each of the plurality of lower dot-pads has an upper-edge. As the top membrane is free of an external force, the lower-edge of top switch-pad is spaced from the upper-edge of bottom switch-pad by a first dimension greater than a second dimension by which the lower-edge of each upper dot-pad is spaced from the upper-edge of each lower dot-pad. The top switch-pad contacts with the bottom switch-pad following the contact of the plurality of upper dot-pads with the plurality of corresponding lower dot-pads as the top membrane is deformed by the external force thereby making a better actuation sensitivity of the membrane switch.

REFERENCES:
patent: 4017697 (1977-04-01), Larson
patent: 4391845 (1983-07-01), Denley
patent: 4818827 (1989-04-01), Ipcinski
patent: 5588673 (1996-12-01), Green

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