Touch switch keyboard apparatus

Details Touch switch keyboard apparatus Touch switch keyboard apparatus

1980-01-07

1981-06-30

Albritton, C. L.

Electrical resistors

Mechanically variable

Musical instrument playing key actuated

84DIG7, H01C 1000

Patent

active

042765382

ABSTRACT:
A multiple touch switch apparatus has at least one multiple segment conductor ply on the top surface of a support ply. The segments are electrically insulated from each other by their lateral displacement but are immediately adjacent so that a selected one or more of the segments can be contacted in response to a single transverse touch force. A second support ply has a unitary conduction ply on its bottom surface spaced apart from, but facing, the multiple segment conductor ply. At least the second support ply and the unitary conduction ply are resilient deformable into contact with one or more segments of the multiple segment conductor ply. Each of the multiple segment conductors or the unitary conduction ply or both may incorporate a conductor layer and a pressure sensitive semiconductor composition layer disposed thereon. The semiconductor layer provides a pressure sensitive variable contact resistance in series with the switch. In another embodiment, each multiple segment conductor ply may be replaced by a single segment conductor.

REFERENCES:
patent: 3624584 (1971-11-01), Ohno
patent: 3626350 (1971-12-01), Suzuki
patent: 3960044 (1976-06-01), Nagai et al.
patent: 4079651 (1978-03-01), Matsui

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