Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-07-24
1976-01-13
Habecker, Thomas B.
Communications: electrical
Audible indication
Percussion-type sound producer
340365R, G08C 100
Patent
active
039328660
ABSTRACT:
A computer keyboard circuit for preventing development of fallacious signals by bouncing or chattering of the keyboard switch contacts, which circuit includes means for delivering a proper output signal to one of several output lines in response to actuation of one of the keyboard switches from a first normal condition to a predetermined actuated condition, and operable to then prevent delivery of an additional output signal to any of the output lines until complete return of the switch to its normal position. To achieve this result, each keyboard switch has two contacts responsive to actuation of the switch to its two different conditions respectively, and the circuitry requires that the switch return the entire distance from one contact to the other in order to condition the apparatus for production of a second output signal.
REFERENCES:
patent: 2716230 (1955-08-01), Oliwa
patent: 2718633 (1955-09-01), Fennessy
patent: 3454147 (1969-07-01), Schrem
patent: 3471789 (1969-10-01), Nutting
Habecker Thomas B.
Ricoh Electronics, Inc.
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