Detrack detecting system in an optical recording/reproducing app

Details Detrack detecting system in an optical recording/reproducing app Detrack detecting system in an optical recording/reproducing app

1990-03-27

1992-09-15

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369 4428, G11B 708, G11B 7125

Patent

active

051484242

ABSTRACT:
A detrack detecting system for detecting deviation of the beam spot from the track in an optical recording/reproducing apparatus in which recording and reproducing of data are performed by irradiating optical beams onto an optical disc. Three beam spots are irradiated at positions on the optical disc which are away from each other by a predetermined distance. The reflected lights are respectively detected by three photodetectors whose photo sensitive surfaces are divided and tracking error signals are detected by a push-pull system. A tracking error signal obtained from the center beam spot of the three beam spots and tracking error signals obtained from other two beam spots are respectively added to obtain the first and second composite tracking error signals. Detracking state is detected based on the polarities of the first and second composite tracking error signals.

REFERENCES:
patent: 4598393 (1986-07-01), Pierce et al.
patent: 4660191 (1987-04-01), Maeda et al.
patent: 4669072 (1987-05-01), Miura et al.
patent: 4750162 (1988-06-01), Tajima
patent: 4817073 (1989-03-01), Suzuki

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