Optical disc reading and reproducing apparatus

Details Optical disc reading and reproducing apparatus Optical disc reading and reproducing apparatus

2008-07-01

2008-07-01

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044250

Reexamination Certificate

active

07394741

ABSTRACT:
An optical disc reading and reproducing apparatus includes reading means for reading data recorded on an optical disc by applying laser light through an objective lens and detecting its reflected light, focus control means for performing focus control for moving the objective lens based on a focus error signal indicating an amount of deviation of a focusing position, focus bias adjustment means for adjusting a focus bias used in the focus control to a voltage in which amplitude of an acquired RF signal is maximized, and detection means for detecting that the amplitude becomes smaller than a predetermined threshold level. The focus bias adjustment means samples the RF signal and acquires the amplitude, sets the focus bias to the amount in which the amplitude of the RF signal is maximized, and stops sampling of the RF signal when the amplitude is detected to be smaller than the predetermined threshold level.

REFERENCES:
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patent: 2003-296952 (2003-10-01), None
patent: 2005-235253 (2005-09-01), None

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