The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 1976
Filed:
Jul. 26, 1973
Applicant:
Inventors:
Yoshikazu Hatsukano, Kodaira, JA;
Takao Tsuiki, Kokubunji, JA;
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08C / ;
U.S. Cl.
CPC ...
3403 / ;
Abstract
A key input circuit characterized in that a plurality of keys are divided into a plurality of key blocks, that a plurality of series of timing pulses of a first group are supplied to the respective key blocks, each series of timing pulses differing in phase from each other series of timing pulses, thereby to multiplex information on the respective keys of each key block, and that the multiplexed key information from the respective blocks is further multiplexed by a plurality of series of timing pulses of a second group, the timing pulses of the second group being longer in duration than the timing pulses of the first group.