Disc reproduction device

Details Disc reproduction device Disc reproduction device

2008-05-20

2008-05-20

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044320, C369S044340

Reexamination Certificate

active

10523519

ABSTRACT:
The present invention provides a disk playback device comprising a control circuit7for determining an optimum value of offset for a focus error signal based on amplitude values of a tracking error signal or an RF signal fed from an optical head5, and making an offset adjustment with reference to the optimum value. The control circuit7, in signal reproduction, approximates the relationship between offset values and the amplitude values to a quadratic curve with reference to three different offset values and three amplitudes at the respective offset values, repeats a calculation of an optimum offset value corresponding to the peak of the quadratic curve, and sets the three different first to third offset values respectively at an optimum value obtained in a previous optimum offset value calculation processing, and second and third offset values set in the previous optimum offset value calculation processing.

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