Electronic instrument keypad assembly with Z-axis oriented elect

Details Electronic instrument keypad assembly with Z-axis oriented elect Electronic instrument keypad assembly with Z-axis oriented elect

1991-03-11

1993-02-16

Scott, J. R.

Electricity: electrical systems and devices

Miscellaneous

200 5A, 361412, H05K 114, H01H 1370

Patent

active

051876477

ABSTRACT:
A keypad structure includes a stiff backing element and an elastomeric cover that have between them a first membrane on which is defined a shorting conductive layer, a second membrane on which is defined a main conductive layer, the second membrane on which the main conductive layer is defined as being adjacent the elastomeric cover rather than the stiff backing element as in the prior art. A third membrane provides spacing between the main and shorting conductive layers when the keypad is not compressed. An elastomeric interconnect can then be used to connect exposed contacts on the main conductive layer with other circuitry in an instrument utilizing the keypad.

REFERENCES:
patent: 3699294 (1972-10-01), Sudduth
patent: 4050756 (1977-09-01), Moore
patent: 4180711 (1979-12-01), Hirata et al.
patent: 4217473 (1980-08-01), Parkinson
patent: 4532575 (1985-07-01), Suwa
patent: 4570521 (1986-02-01), Fox
patent: 4602135 (1986-07-01), Phalen
patent: 4640994 (1987-02-01), Komaki

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