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. 01, 1988
Filed:
Jul. 01, 1987
Shigenori Oosaka, Tokyo, JP;
Naoki Takatori, Tokyo, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A stepping motor for use in a magnetic disc reproducing apparatus for causing radial scanning movement of a magnetic head relative to a magnetic disc having many picture information recorded on concentric tracks, comprises a casing, a rotor, stator coils to which current is supplied according to a sequence of phase cycles, and a rotor positions detector which includes two electrically-connected contactors mounted on the rotor, and an annular conductor pattern and an arcuate conductor pattern provided in the casing to make continuous and temporary contact with the respective contactors. The arcuate conductor pattern covers a range corresponding to an angle through which the rotor rotates in a predetermined one cycle among the phase cycles of current supply to the coils.