Optical disc recording and reproducing apparatus

Details Optical disc recording and reproducing apparatus Optical disc recording and reproducing apparatus

2011-01-25

2011-01-25

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S044320, C369S044350, C369S044410

Reexamination Certificate

active

07876649

ABSTRACT:
A DSP of the DVD recorder includes a balance value setting portion for determining an appropriate value of a focus balance value α when information is reproduced from an optical disc so as to record the determined focus balance value α0in a balance value storing portion and to set the same in a first amplifier of a focus error signal generating circuit, and a correction executing portion for reading the focus balance value α0stored in the balance value storing portion when information is recorded in the optical disc2so as to correct the read value to be a focus balance value α1, which is set in the first amplifier of the focus error signal generating circuit.

REFERENCES:
patent: 6744705 (2004-06-01), Sumida et al.
patent: 7551529 (2009-06-01), Mitsuda
patent: 2004/0179450 (2004-09-01), Mori et al.
patent: 2005/0180279 (2005-08-01), Sogawa et al.
patent: 2007/0133366 (2007-06-01), Sawada
patent: 2007/0297306 (2007-12-01), Kim
patent: 2005-228366 (2005-08-01), None

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