Information storage device with head position detection outside

Details Information storage device with head position detection outside Information storage device with head position detection outside

1990-09-13

1994-02-08

Pascal, Robert J.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 41, 369 4426, 369 4428, 369 53, G11B 1722

Patent

active

052854310

ABSTRACT:
In a disk drive device comprising an optical head having a movable part including a lens for focusing a light spot on a track of an optical disk and a photodetector which receives the light reflected from the track and provides a photoelectric conversion signal, a head actuator moves the movable part in a radial direction of the optical disk when the optical head accesses the tracks of the optical disk, and a motion detection means receives the photoelectric conversion signal and outputs a track-traverse motion signal representing the track-traverse motion of the light spot. An acceleration detecting means detects the acceleration of the head actuator. A target velocity generating means generates a track-traversing target velocity determined by the output of acceleration detecting means and the photoelectric conversion signal. A state-observer means receives the output signals from the acceleration detecting means and the motion detecting means, and outputs an estimated track-traverse velocity of the light spot. A head actuator drive circuit controls the head actuator such that the estimated velocity coincides with the target velocity.

REFERENCES:
patent: 4731771 (1988-03-01), Maeda et al.
patent: 4835752 (1989-05-01), Nakatsu et al.
Patent Abstracts of Japan, vol. 6, No. 195 (P-146) (1073) Oct. 5, 1982.
Patent Abstracts of Japan, vol. 6, No. 248 (P-160) (1126) Dec. 7, 1982.
Research Disclosure, vol. 2244, No. 265, May 1986, New York, p. 253 "Tracking Acquire on an Optical Disk".
Patent Abstracts of Japan, vol. 9, No. 246 (P-393) (1969) Oct. 3, 1985.
Patent Abstracts of Japan, vol. 10, No. 266, (P-496) (2322) Sep. 11, 1986.

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