Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1978-09-27
1981-11-10
Groody, James J.
Communications: electrical
Audible indication
Percussion-type sound producer
336110, 340365S, G06F 302
Patent
active
043001270
ABSTRACT:
A solid state noncontacting mechanically actuated keyboard type switch and interconnecting networks for switch arrays are described herein. The basic switch is a balanced or differential transformer element with a movable magnetic core, or shorted turn, actuator which is inserted through one-half of the transformer element, one primary-secondary pair, causing the transformer to change from a balanced or "off" state to an unbalanced or "on" state. The single turn coils that make up the differential transformer element lie in a plane, and in one embodiment of this invention the primary coils and their interconnecting network are printed on one side of a doubled sided printed circuit board, and the secondary coils and their interconnecting network are printed in proper alignment on the opposite side. A hole is provided through the printed circuit board for each transformer element for insertion of a magnetic actuator. Also described is a two dimensional X-Y switch matrix and a three dimensional X-Y-Z switch matrix, for facilitating electronic scanning of the keyboard for implementing encoding, multikey rollover, etc., techniques.
REFERENCES:
patent: 3443128 (1969-05-01), Fakan
patent: 3522442 (1970-08-01), Wood
patent: 3565014 (1971-10-01), Taylor
patent: 3573369 (1971-04-01), Konig et al.
patent: 3612241 (1971-10-01), Bernin
patent: 3623081 (1971-11-01), Scarbrough
patent: 3638221 (1972-01-01), Bernin
patent: 3638222 (1972-01-01), Bernin
patent: 3668697 (1972-06-01), Cochran et al.
patent: 3683110 (1972-08-01), Shepard
patent: 3683371 (1972-08-01), Holz
patent: 3698531 (1972-10-01), Bernin
patent: 3719902 (1973-03-01), Esterly
patent: 3740746 (1973-06-01), Dureau et al.
patent: 3745536 (1973-07-01), Klehm
patent: 3772684 (1973-11-01), Scantlin
patent: 3825909 (1974-07-01), Engstrom et al.
patent: 3836910 (1974-09-01), Bernin
patent: 3918051 (1975-11-01), Bernin et al.
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