Optical information processing apparatus in which an optical hea

Details Optical information processing apparatus in which an optical hea Optical information processing apparatus in which an optical hea

1993-03-19

1993-11-09

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 54, G11B 7085

Patent

active

052609235

ABSTRACT:
An apparatus is disclosed in which a recording medium on which tracks are concentrically or spirally formed is rotated and the tracks are scanned by a light beam to thereby accomplish recording and/or reproduction of information. The apparatus includes an optical system for applying the light beam to the medium, a first actuator for driving at least a portion of the optical system to move the light beam in a direction across the tracks, a first detector for detecting any positional deviation between the light beam and the tracks, a first control circuit for controlling the first actuator in accordance with the output of the first detector, an optical head carrying the optical system and the first actuator thereon, a second actuator for moving the optical head in the direction across the tracks, a second detector for detecting the position of the moved portion of the optical system relative to the optical head, and a second control circuit for controlling the second actuator in accordance with a signal in which the eccentric component of the medium is eliminated from the output of the second detector.

REFERENCES:
patent: 4410969 (1983-10-01), Maeda
patent: 4627039 (1986-12-01), Meyer
patent: 4907214 (1990-03-01), Nagano et al.
patent: 4942563 (1990-07-01), Yamamuro
patent: 4985882 (1991-01-01), Tanaka et al.

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