Area actuated switch array

Details Area actuated switch array Area actuated switch array

1980-10-01

1982-11-23

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200 86R, 200159B, 364709, H01H 1370

Patent

active

043607160

ABSTRACT:
Disclosed is an area actuated switch which can be used, by way of example, in a keyboard for a calculator, learning aid or the like. An area actuated switch array is formed using two insulating sheets which overlie one another such that one side of each sheet faces one another. Sets of spaced conductors formed on each of the facing sides also overlie one another, and selected ones of said conductors traverse the periphery of the keyboard. A plurality of raised, insulating spacer points are positioned on the facing sides and are in registration and contact with each other. An insulating substrate is formed over the conductors traversing the periphery and this insulating substrate has substantially the same thickness as the spacer points such that the spacer points and the insulating substrate prevent the spaced conductors from making electrical contact. An adhesive coating is applied to the spacer points and the insulating substrate to bond these two parts together. The bond created by the adhesive coating over the insulating substrate prevents contamination of the keyboard from dust, humidity and the like. The keyboard structure, therefore, may have an infinite active area such that when pressure is applied anywhere within the periphery of the switch array, electrical contact is made.

REFERENCES:
patent: 2790873 (1957-04-01), Fleming
patent: 2843695 (1958-07-01), Osuch et al.
patent: 3668337 (1972-06-01), Sinclair
patent: 3911234 (1975-10-01), Kotaka
patent: 4066851 (1978-01-01), White et al.
patent: 4084071 (1978-04-01), Smith
patent: 4143253 (1979-03-01), Wagner et al.
patent: 4307275 (1981-12-01), Larson et al.

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