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:
Feb. 04, 1992
Filed:
Oct. 31, 1990
Applicant:
Inventors:
Satoshi Sakata, Hachioji, JP;
Kazuo Sato, Hachioji, JP;
Yuichi Gotoh, Hachioji, JP;
Mitsuo Azumai, Hachioji, JP;
Ikuya Hotta, Hachioji, JP;
Assignee:
Konica Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318268 ; 388811 ; 388911 ;
Abstract
A motor speed control device for use in an image forming apparatus with a differential phase detection circuit for outputting differential phase data between the clock pulse and a frequency proportional signal representative of the motor speed and a differential speed detecting circuit for outputting differential speed data between the length of the clock signal and the length of the speed signal. A pulse width modulated signal obtained from the two signals controls the speed of the motor.