Membrane keyboard switch assembly having spacer structure and me

Details Membrane keyboard switch assembly having spacer structure and me Membrane keyboard switch assembly having spacer structure and me

1986-05-29

1987-09-15

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

29622, 200159B, 200 86R, H01H 1370

Patent

active

046941266

ABSTRACT:
A membrane keyboard is comprised of first and second dielectric layers having circuit patterns including a plurality of first and second electrical contact pads disposed on opposing surfaces thereof. The layers are maintained together such that corresponding first and second electrical contact pads overlie one another forming switch sites. A spacer is disposed in a discontinuous pattern around the first contact pads, the spacer normally maintaining corresponding first and second contact pads spaced from each other, while permitting electrical engagement therebetween upon application of an actuation force to one of the layers at a switch site.

REFERENCES:
patent: 3668337 (1972-06-01), Sinclair
patent: 4220815 (1980-09-01), Gibson, Jr. et al.
patent: 4317013 (1982-02-01), Larson
patent: 4324962 (1982-04-01), Dulen
patent: 4382165 (1983-05-01), Balash et al.
patent: 4391845 (1983-07-01), Denley
patent: 4451714 (1984-05-01), Eventuff
patent: 4463232 (1984-07-01), Takakuwa
patent: 4525606 (1985-06-01), Sado

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