Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
2008-03-18
2008-03-18
Le, Uyen Chau N. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C369S044290, C369S053280
Reexamination Certificate
active
07344077
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.
Ishimaru Atsushi
Sagara Seiichi
Le Uyen Chau N.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Peguero Merlin Brito
Sony Corporation
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