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:
Apr. 29, 1997
Filed:
Jul. 20, 1994
Applicant:
Inventor:
Hiroshi Miyanari, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318696 ; 318685 ; 318 65 ; 318280 ; 318286 ;
Abstract
A stepping motor drive circuit including a bridge circuit composed of energizing coils constituting a stepping motor and four transistors, and current value switching circuitry for selecting a value of current flow according to the rotation direction of the stepping motor. A value of constant current flow is determined according to the rotation direction of the stepping motor, so that the torque of the stepping motor is optimized relative to a load.