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:
Aug. 22, 1989
Filed:
Sep. 03, 1985
Applicant:
Inventors:
Akihiko Taniguchi, Nara, JP;
Yasushi Nakanishi, Yamatokoriyama, JP;
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
2502 / ; 377 17 ; 364142 ; 355204 ;
Abstract
A copying timing counting system for counting the rotation angle of a photoreceptor drum in an electrophotographic copying machine comprises a pulse generator, and a pulse counter. The pulse counter is responsive to the pulse generator for counting both the pulse rising edge and the pulse falling edge. Since the counter can count both the pulse rising edge and the pulse falling edge, the resolving power of the photoreceptor drum can be doubled as compared with the detection system of either of the pulse rising edge or the pulse falling edge taken alone.