Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1993-09-10
1995-09-05
Chin, Tommy P.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4434, 369 4435, G11B 709
Patent
active
054485428
ABSTRACT:
An optical information recording and reproducing apparatus for effecting at least one of recording of information on and reproducing of information from a recording medium. The apparatus includes an optical system for applying a light beam to a desired track on the recording medium, a tracking and focusing error detection device for detecting tracking and/or focusing error of the light beam relative to the track, a computing unit for (i) receiving respective tracking error and focusing error output signals from the detecting device, (ii) effecting a computation for a selected output signal among the received output signals on the basis of a predetermined program to correct the detected tracking error and focusing error, (iii) calculating tracking and focusing control movement amounts and (iv) outputting a tracking control signal and a focusing control signal corresponding to the tracking control movement amount and the focusing control movement amount, respectively. The apparatus also includes a tracking actuator for moving at least a portion of the optical system to move the light beam relative to the track on the basis of the tracking control signal, and a focusing actuator for moving a portion of the optical system relative to the recording medium to adjust a focusing state of the light beam on the basis of the focusing control signal.
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Hederer, et al., "Programmed Measurement for Selection of Data Measured," Messen & Prufen/Automatik 72, vol. 180, No. 4, Apr. 1976, pp. 180, 182 through 186, 200.
Canon Kabushiki Kaisha
Chin Tommy P.
Truong Khoi
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