Title: Computer keyboard circuitry

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.

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Inventors: Sasaki, Hiroshi (Irvine, CA, US)

Application Number: 491446
Filing Date: 1974-07-24
Publication_date: 1976-01-13
Assignee: Ricoh Electronics, Inc. (Irvine, CA)
Primary Class(es): 341/24 341/34
Other Classes:
US Patent Ref:

2716230	Aug, 1955	Oliwa	340/365.
2718633	Sep, 1955	Fennessy	340/365.
3454147	Jul, 1969	Schrem	340/365.
3471789	Oct, 1969	Nutting	340/365.

Other Refs:
Primary Examiner: Habecker, Thomas B.
Assistant Examiner:
Attorney: Wills, Green & Mueth