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, 1995
Filed:
Sep. 27, 1993
Applicant:
Inventor:
Shigeru Jinnai, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ; G05B / ;
U.S. Cl.
CPC ...
318603 ; 318599 ; 318601 ; 318608 ; 388800 ;
Abstract
A speed control apparatus for a motor has a driver for the motor. The motor's rotational speed is detected, and a signal from the detector is counted. Signals from the counter received as the input by another circuit, which outputs data representing irregularities in the detection signal once the motor has reached its constant speed. Correction information is supplied to the motor driver on the basis of the irregularity data.