Information storage device capable of oepration in a velocity co

Details Information storage device capable of oepration in a velocity co Information storage device capable of oepration in a velocity co

1993-11-30

1995-03-14

Neyzari, Ali

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 41, 369 4428, 369 53, G11B 1722

Patent

active

053982215

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:
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patent: 4835752 (1989-05-01), Nakatsu et al.
patent: 5285431 (1994-02-01), Ogawa
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) 3 Oct. 1985.
Patent Abstracts of Japan, vol. 10, No. 266 (P-496) (2322) 11 Sep. 1986.
Patent Abstracts of Japan, vol. 6, No. 195 (P-146) (1073) 5 Oct. 1982.
Patent Abstracts of Japan, vol. 6, No. 248 (P-160) (1126) 7 Dec. 1982.

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