Information storage device using a rotary recording medium

Details Information storage device using a rotary recording medium Information storage device using a rotary recording medium

1993-05-26

1995-05-16

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

G11B 555, G11B 3308

Patent

active

054166586

ABSTRACT:
Degradation of a detector-head positioning in an information storage device using a rotary recording medium may be prevented. A reaction force which gives a vibration to a positioning mechanism in a magnetic disk drive generally occurs when the detector heads seek a destination track on a rotary recording medium. This vibration or impact may be decreased or eliminated if an actuator magnet is supported on a linear-slider member or a rotary-slider member. Sliding motion is received with a pneumatic spring to softly result in no vibration being transmitted to the spindle or other positioning mechanism. The pneumatic spring can drastically reduce a proper vibration frequency of the positioning mechanism (magnetic-circuit support) to such an extent that an electrical servo system can catch the vibration frequency and can hold down a location error. Even if a reaction force is too big to prevent resonance from being caused, the pneumatic spring can quickly attenuate the reaction force using its own throttle hole. In case the magnetic disk drive is fixed on an incline or a slant, another spring between a magnetic circuit and a housing can regulate a positional relationship relative to peripheral members including the actuator.

REFERENCES:
patent: 3643242 (1972-02-01), Bryer
patent: 3769467 (1973-10-01), Gabor
patent: 4237504 (1980-12-01), Ho et al.
patent: 4571649 (1986-02-01), Goss
patent: 4603363 (1986-07-01), Rickert et al.
patent: 4754349 (1988-06-01), Nishida et al.
patent: 4812932 (1989-03-01), Hishinuma et al.
patent: 5146122 (1992-09-01), Hearn et al.

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