Keyboard circuit apparatus

Details Keyboard circuit apparatus Keyboard circuit apparatus

1994-02-24

1996-05-07

Kincaid, Kristine L.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200512, 341 22, H01H 158, H01H 1370

Patent

active

055148425

ABSTRACT:
A keyboard circuit apparatus is constituted such that resistive elements are provided both in a first sheet and a second sheet, an insulating spacer being laid on the first sheet, and the second sheet being laid on the insulating spacer. When a key switch is closed, one of the resistive elements provided on the first sheet and one of the resistive elements provided on the second sheet are electrically connected in series so that a desired value of resistance can be obtained.

REFERENCES:
patent: 3720938 (1973-03-01), LePosauic
patent: 4518833 (1985-05-01), Watkins
patent: 4994634 (1991-02-01), Tanji et al.
patent: 5081453 (1992-01-01), Endoh et al.

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