Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1987-12-14
1989-05-30
Stephan, Steven L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
360 7804, 369 41, 369215, G11B 2108, G11B 7095
Patent
active
048357529
ABSTRACT:
A device for driving and controlling an optical head by forming a spot of a light beam on an optical disk having a plurality of tracks and detecting light from the spot reflected on the optical disk by a pair of optical detectors disposed in the head. This device has: a head actuator for moving a movable portion of the optical head in the radial direction of the disk; a speed detector for detecting the track-crossing speed of the spot from outputs from the optical detectors; a reference speed generator for generating, while accessing to a target track, a reference moving speed signal in accordance with the distance to the target track obtained from the outputs from the optical detectors, the movable head portion being moved on the basis of the reference moving speed signal so that the speed of the movable portion decreases at a position near the target track before the light beam spot reaches this track; a speed error detector for obtaining the difference between outputs from the reference speed generator and the speed detector; and a magnification change circuit adapted for amplifying the outputs from the reference speed generator and the speed detector by a predetermined multiplying factor when the distance between the light beam spot and the target track, or the crossing speed of the spot, becomes smaller than a predetermined value, the magnification change circuit also being adapted for outputting the difference obtained by the speed error detector after multiplying it by the reciprocal of the multiplying factor. The head actuator is driven on the basis of the output from the error detector so as to control the speed of the movable head portion.
REFERENCES:
patent: 4498158 (1985-02-01), Akiyama
patent: 4736353 (1988-04-01), Kasai et al.
patent: 4745587 (1988-05-01), Maeda et al.
patent: 4745588 (1988-05-01), Yoshikawa et al.
patent: 4764911 (1988-08-01), Moyota et al.
patent: 4769800 (1988-09-01), Mosey et al.
patent: 4785439 (1988-11-01), Okada et al.
Hayashi Shigeo
Itou Osamu
Nakatsu Keiji
Ogawa Masaharu
Tanaka Kunimaro
Mitsubishi Denki & Kabushiki Kaisha
Stephan Steven L.
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