Contactless keyswitch for keyboards

Details Contactless keyswitch for keyboards Contactless keyswitch for keyboards

1977-04-13

1978-09-26

Scott, James R.

Inductor devices

With closed coil or conductor member

Movable with respect to another coil

200 5A, 200159R, 336200, 340365L, H01F 2104, G08C 100

Patent

active

041174380

ABSTRACT:
Inductive sensing keyswitch includes a printed circuit transformer and sheet of material having hinged metal flaps formed therein and each flap is resiliently biased against both printed circuit coils of the transformer for eddy-current shorting of both coils wherein keys on the keyboard have key stems passing through the printed circuit board between the printed coils and the flap hinges to provide a mechanical advantage for moving the flaps away from the printed circuit coils a greater distance than the short stroke movement of the key.

REFERENCES:
patent: 3188435 (1965-06-01), Rugsten
patent: 3294927 (1966-12-01), Hill
patent: 3623081 (1971-11-01), Scarbrough
patent: 3668697 (1972-06-01), Cochran et al.
patent: 3683371 (1972-08-01), Holz
patent: 3740746 (1973-06-01), Dureau et al.
patent: 3757068 (1973-09-01), Musch et al.

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