Optical pickup device and information recording/reproducing...

Details Optical pickup device and information recording/reproducing... Optical pickup device and information recording/reproducing...

2006-07-13

2010-11-16

Chow, Lixi (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053280

Reexamination Certificate

active

07835237

ABSTRACT:
There are obtainable reliable and proper tracking correction and CTC even when fluctuations occur in an irradiation position of a sub-beam in a track at the time of performing tracking correction and CTC using three beams. Five beams (a main beam, sub-beams inA and inB, and sub-beams outA and outB) are generated. Reflection beams of the five beams are received, and a differential push pull signal DPPin corresponding to the sub-beams “in” as ± first-order beams and a differential push pull signal DPPout corresponding to the sub-beams “out” as ± second-order beams are generated. By assigning weights to the differential push pull signals DPPin and DPPout and computing the sum of the weighted signals, a tracking error signal Ste having an amplitude value which can perform tracking correction is generated.

REFERENCES:
patent: 6088310 (2000-07-01), Yanagawa
patent: 7116612 (2006-10-01), Ogasawara et al.
patent: 7266057 (2007-09-01), Buchler
patent: 2004/0246834 (2004-12-01), Seong
patent: 2001-297461 (2001-10-01), None
patent: 2004-5859 (2004-01-01), None

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