Solid state keyboard

Details Solid state keyboard Solid state keyboard

1978-10-26

1981-05-19

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Magnetic field or compass

340365L, H01L 4304

Patent

active

042688140

ABSTRACT:
A solid state keyboard comprised of a base module, a plurality of key members each having a plunger member comprised of a uniform mixture of a magnetic material such as barium ferrite and a binder such as nylon, and a respective plurality of improved Hall Effect Generators, provides a significant improvement in performance and cost effectiveness. Actuation of a key member moves its plunger member, which has a preselected magnetic field, relative to an improved Hall Effect Generator, in which offset voltage has been substantially eliminated. This movement exposes the generator to a change in the direction of the magnetic field, thus causing a corresponding change in the output voltage of the generator from a first predetermined voltage to a second predetermined voltage. A unique tripolar magnetic arrangement on the plunger member provides positive switching and better control of switching points.

REFERENCES:
patent: Re29451 (1977-10-01), Baermann
patent: 3177546 (1965-04-01), Bey
patent: 3418613 (1968-12-01), Trikilis
patent: 3590134 (1971-06-01), Ogi
patent: 3633145 (1972-01-01), Ohno
patent: 3750077 (1973-07-01), Nishiba
patent: 3848216 (1974-11-01), Gamble
patent: 3911429 (1975-10-01), Vinal

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