Apparatus for generating tracking error signals

Details Apparatus for generating tracking error signals Apparatus for generating tracking error signals

2008-03-11

2008-03-11

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044320, C369S053330, C369S053280, C369S044340

Reexamination Certificate

active

07342854

ABSTRACT:
An apparatus for generating tracking error signals including: an optical detection unit having a plurality of divided light receiving elements to allow beams reflected from a recording surface of the optical disks to be incident; a comparator for outputting after comparing the signals from light receiving elements, which correspond to the set group of the optical detection unit, with the reference signals set for the each group; an error correction unit for correcting and outputting errors if there are any errors after mutual comparison with signals of the groups output from the comparator; a phase-difference detection unit for outputting the signals for each group that correspond to a phase-difference after mutual comparison of the signals of the groups output from the error correction unit; a subtractor for mutually subtracting the signals for each group from the phase-difference detection unit and outputting the tracking error signals.

REFERENCES:
patent: 6262954 (2001-07-01), Watabe
patent: 6266305 (2001-07-01), Buchler
patent: 6781932 (2004-08-01), Beatson
patent: 6977982 (2005-12-01), Ma et al.
patent: 2002/0006091 (2002-01-01), Ma et al.
patent: 2002/0018411 (2002-02-01), Kumagai
patent: 2003/0202438 (2003-10-01), Nomoto
patent: 2004/0151089 (2004-08-01), Buchler et al.

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