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. 14, 1987
Filed:
Oct. 13, 1983
Applicant:
Inventors:
Hatsuo Takahashi, Chigasaki, JP;
Junichi Hibino, Minami-ashigara, JP;
Assignees:
Hitachi, Ltd., both of, JP;
Hitachi Electronics Engineering Co., Ltd., both of, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
360 98 ;
Abstract
A rotary actuator for a magnetic disc device for swinging a head arm to position a magnetic head mounted at an end of the head arm to a desired track of a magnetic disc is disclosed. Magnetic shield plates are provided to a magnetic circuit assembly which forms a voice coil motor together with a moving coil mounted at a rear end of a head carriage which supports the head arm in order to prevent leakage magnetic fluxes created in the vicinity of a permanent magnet of the magnetic circuit assembly from reaching the magnetic head.