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:
Jun. 30, 1987
Filed:
Mar. 20, 1986
Applicant:
Inventors:
Tadami Sugawara, Furukawa, JP;
Masao Okita, Furukawa, JP;
Assignee:
Alps Electric Co., Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318696 ; 318685 ; 360 75 ;
Abstract
A controlling circuit for a stepping motor provided on a disk recording and reproducing apparatus which circuit can prevent outputting of a zero track signal in error that may be caused by a stepping error to assuredly step a head to the zero track of a disk. The circuit comprises an excitation initializing circuit which is operable in response to a power on signal and a drive select signal for sequentially switching the exciting mode of the stepping motor from the AB phase mode to the AB phase mode.