Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1997-01-31
1998-09-01
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
G11B 554, G11B 2122
Patent
active
058019073
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.
REFERENCES:
patent: 4756341 (1988-07-01), Takehana
patent: 5023736 (1991-06-01), Kelsic
patent: 5034837 (1991-07-01), Schmitz
patent: 5170300 (1992-12-01), Stefansky
patent: 5315455 (1994-05-01), Ito
patent: 5448435 (1995-09-01), Nakazawa et al.
PCT Publication No. WO 93/10535 published May 27, 1993, Abstract only.
Katoh Takehiko
Matsumoto Takashi
Myokan Kenichi
Shimada Kunihiro
Takaishi Kazuhiko
Fujitsu Limited
Klimowicz William J.
Levy Stuart S.
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