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:
Sep. 01, 1998
Filed:
Jan. 31, 1997
Norio Yagi, Kawasaki, JP;
Kunihiro Shimada, Kawasaki, JP;
Takehiko Katoh, Kawasaki, JP;
Kenichi Myokan, Kawasaki, JP;
Takashi Matsumoto, Kawasaki, JP;
Kazuhiko Takaishi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A magnetic disk drive for locking an actuator mounted with a magnetic head in a safety zone. The magnetic disk drive comprises a magnet, fixed yoke members and a stopper for setting a stop position of rotations of the rotary actuator in such a position that torque by the fixed yoke members and the magnet is maximized. The fixed yoke members form a magnetic circuit for the magnet in all or a part of a movable range of the rotary actuator. The fixed yoke members include a first area having a gap width uniformly reduced in a lock direction to retract the rotary actuator and a second area having a gap width smaller than a gap width of the first area. The fixed yoke members are mechanically separated from each other. The fixed yoke members further include a second area having a minimum gap width to lock the rotary actuator, a first area having such a gap that a gap width becomes smaller as it approaches the second area and a third area formed between the second area and the first area and having a gap width larger than a gap width of the second area.