Method of making a membrane switch

Details Method of making a membrane switch Method of making a membrane switch

1981-11-19

1983-07-05

Smith, John D.

Coating processes

Electrical product produced

427 96, 427282, 4272071, 200159B, 200 5A, 200292, H01H 1106

Patent

active

043918450

ABSTRACT:
This invention relates to a method of fabricating a membrane switch of the type having a substrate, a flexible membrane, electrical conductors formed on the membrane and substrate, and an intervening spacer between the sets of conductors. The conductors include a plurality of switch sites which are in facing relation to define a specific switch. The spacer means comprises a plurality of individual spacer areas which are located remote from the switch sites. The manufacturing method uses a multiple pass screen printing operation. During the first pass a set of conductors is formed from conductive ink on either the membrane or substrate. Also, during the first screening pass a first layer of the spacer areas is formed from the same conductive material as the set of conductors. On subsequent screening passes additional layers are deposited on the spacer areas to build up the thickness of the areas so that the spacer thickness is greater than that of the conductors. The location of the spacer areas and the formation of the first layer of the spacer areas from conductive material permits elimination of one screening pass and subsequent registration problems.

REFERENCES:
patent: 3995126 (1976-11-01), Larson
patent: 4184043 (1980-01-01), Hildering
patent: 4317013 (1982-02-01), Larson
patent: 4320573 (1982-03-01), Larson

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