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:
Nov. 27, 2001
Filed:
Oct. 19, 1999
Applicant:
Inventors:
Kenichi Maruyama, Kashiwa, JP;
Atsushi Ohtani, Abiko, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 8/00 ;
U.S. Cl.
CPC ...
H02P 8/00 ;
Abstract
A stepping motor preferably applied to an image reading motor for a facsimile device or the like, drives the rotation with low noise by repeating turning-on and turning-off switching of the driving voltage in the stepping motor when a change of the exciting phase in the stepping motor is not continued for a constant time and performing the repeated switching for a predetermined cycle. At the same time the present motor can prevent the passage of current through all of four phase coils by the manner that a pair of phases in the stepping motor are not simultaneously driven.