Method and apparatus for tracking servo control of an...

Details Method and apparatus for tracking servo control of an... Method and apparatus for tracking servo control of an...

2005-01-21

2009-06-23

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053350, C369S053160

Reexamination Certificate

active

07551528

ABSTRACT:
An optical disc playback apparatus includes an optical pickup, an RF amplifier that generates a tracking error (TE) signal based on an electrical signal from the optical pickup, a defect detector that detects a defect on the optical disc and that outputs a DFCT signal indicating the detected defect, a switch that outputs a hold signal when a defect is detected based on the DFCT signal, a driver that controls the optical pickup based on the output signal of the switch, a corrector that extracts an oscillation component of the optical pickup from the TE signal in response to the DFCT signal when a defect is detected and that outputs a correction signal indicating the oscillation component, and an adder that adds the correction signal from the corrector to the hold signal.

REFERENCES:
patent: 6172953 (2001-01-01), Kamiyama
patent: 6341113 (2002-01-01), Kamiyama
patent: 6510112 (2003-01-01), Sakamoto et al.
patent: 6947359 (2005-09-01), Yokoyama et al.
patent: 01-162281 (1989-06-01), None
patent: 2000-90467 (2000-03-01), None
patent: 2000-163767 (2000-06-01), None
patent: 2001-243641 (2001-09-01), None

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