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:
May. 09, 1989
Filed:
Apr. 20, 1987
Kazuhiro Tokuda, Tokyo, JP;
Toshikatsu Harase, Tokyo, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A device is disclosed for detecting a position of reference for the movement of a magnetic head when the magnetic head is moved by a driving force from a rotary driving source in the radial direction of a magnetic disc. A plurality of rotary members having speed reduction ratios different from each other are rotated by the rotary driving source, and a time, at which phases of these rotary members coincide with each other, is made to be the position of reference. Here, the speed reduction ratios of the plurality of rotary members are selected such that the phases of the plurality of rotary members coincide with each other only once during the movement of the magnetic head over the all of area of the magnetic recording.