Electronic keyboard

Details Electronic keyboard Electronic keyboard

1975-09-05

1976-07-06

Habecker, Thomas B.

Communications: electrical

Audible indication

Percussion-type sound producer

340365R, 317249R, G08C 100

Patent

active

039684881

ABSTRACT:
An electronic keyboard comprises a plurality of depressable keys each one of which comprises a stem normally movable and connected through a spring to a metallic actuator. Each actuator is lodged in a supporting element jutting out from the stem and cooperates with a permanent magnet which retains it in a rest position. Upon the depression of a key, the corresponding spring is loaded and after a predetermined displacement of the key a shoulder of the supporting element cooperates directly with the corresponding actuator disengaging it from the permanent magnet. The actuator is then pushed by the action of the spring to a movable contact of an electronic switch which generates an electrical signal.

REFERENCES:
patent: 3710209 (1973-01-01), Webb
J. J. Hagopian, "Encoding and Self-Checking Keyboard," vol. 9, No. 11, Apr. 1967, P. 1523, IBM Technical Disclosure Bull.

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