Solid state keyswitch arrangement

Details Solid state keyswitch arrangement Solid state keyswitch arrangement

1978-09-19

1980-05-13

Caldwell, Sr., John W.

Communications: electrical

Audible indication

Percussion-type sound producer

323 94H, 335205, 338 32H, H03K 1790, H01L 4306

Patent

active

042030935

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, in rectilinear fashion 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.

REFERENCES:
patent: 3167624 (1965-01-01), Jones
patent: 3233061 (1966-02-01), Jones
patent: 3638221 (1972-01-01), Bernin
patent: 3668596 (1972-06-01), Hubrich
patent: 3848216 (1974-11-01), Gammble
patent: 3858145 (1974-12-01), Sulich et al.
patent: 3873957 (1975-03-01), Wurscher et al.

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