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:
Jul. 16, 1991
Filed:
Apr. 18, 1990
Applicant:
Inventor:
Shoji Takahashi, Saitama, JP;
Assignee:
Citizen Watch Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318696 ; 318685 ; 360 7814 ;
Abstract
A drive circuit for a stepping motor used for seeking the reading/writing head of a floppy disk or the like. The stepping motor is smoothly driven by inserting an inner step pulse between the input step pulses when excitation signals are supplied to the stepping motor on the basis of the step pulses from the host computer. Since the interval between the step pulses output from the host computer is different each time, the interval between the step pulses is measured and the timing for generating an inner step pulse is determined on the basis of the measured value.