Optical pickup control apparatus, optical pickup control...

Details Optical pickup control apparatus, optical pickup control... Optical pickup control apparatus, optical pickup control...

2008-03-18

2008-03-18

Le, Uyen Chau N. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C369S044290, C369S053280

Reexamination Certificate

active

11320695

ABSTRACT:
The present invention has been made to adequately and quickly adjust the spherical aberration and focus bias in an optical pickup. In the present invention, evaluation values are measured on a plurality of respective measurement points each determined by a combination of a spherical aberration correction value and focus bias value and a two-variable function having the spherical aberration correction value and focus bias value as variables is approximated to the evaluation values. Based on the two-variable function obtained by the approximation, the optimal value of the spherical aberration correction value and focus bias value on which the evaluation value becomes optimal is calculated. As a result, it is possible to adequately and quickly adjust the spherical aberration and focus bias in an optical pickup.

REFERENCES:
patent: 2004-095106 (2004-03-01), None
English translation of Japenese application JP-2004-095106 A.

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