Optical disc apparatus and offset adjustment method thereof

Details Optical disc apparatus and offset adjustment method thereof Optical disc apparatus and offset adjustment method thereof

2011-06-21

2011-06-21

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044370, C369S044350, C369S044410, C369S120000

Reexamination Certificate

active

07965590

ABSTRACT:
An optical disc apparatus includes a laser diode for emitting a laser light, a beam splitter for dividing the laser light into a main beam and sub beam, a main photodetector for detecting the main beam to output a main push-pull signal, a sub photodetector for detecting the sub beam to output a sub push-pull signal, and a subtracter for calculating the main and sub push-pull signals to output a differential push-pull signal, in which an amplification degree of the sub push-pull signal is adjusted so that a DC offset on the differential push-pull signal is adjusted, even in the case where a laser intensity is varied.

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