Membrane switch device capable of ensuring bonding around mounti

Details Membrane switch device capable of ensuring bonding around mounti Membrane switch device capable of ensuring bonding around mounti

1999-09-14

2000-03-28

Friedhofer, Michael

Electricity: circuit makers and breakers

Solid contact

Membrane type

H01H 1370

Patent

active

060434414

ABSTRACT:
A membrane switch is disclosed which comprises an upper sheet, a lower sheet disposed in an opposed relation to the upper sheet, and an insulating resist layer for pasting both upper and lower sheets with each other. The upper and lower sheets are respectively formed with plural contact portions and plural mounting holes in such a manner that the contact portions formed on the upper sheet side and the contact portions formed on the lower sheet side are opposed to each other and so are the mounting holes. The insulating resist layer comprises a first insulating resist layer formed on at least one of the upper and lower sheets except the portions where the contact portions are positioned and a second insulating resist layer formed on the first insulating resist layer at each of positions near the mounting holes so as to surround the whole circumference of each mounting hole. The insulating resist layer in the area where the second resist layer is formed is made thicker than in the other area.

REFERENCES:
patent: 4289940 (1981-09-01), Sado et al.
patent: 4433223 (1984-02-01), Larson et al.
patent: 4489227 (1984-12-01), Lamarche
patent: 4558190 (1985-12-01), Saito
patent: 4694126 (1987-09-01), Aiken, Jr. et al.
patent: 5401922 (1995-03-01), Asta

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