Aberration compensating device and optical head device
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United States of America Patent
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Jan 16, 2007
Grant Date -
Jan 19, 2006
app pub date -
Jun 30, 2005
filing date -
Jul 16, 2004
priority date (Note) -
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Abstract
An aberration compensating device for compensating aberration of a laser beam emitted from a light source and converged on an optical recording disk through an objective lens includes a liquid crystal panel including a liquid crystal layer and transparent electrodes disposed so as to interpose the liquid crystal layer therebetween and a liquid crystal panel control part for controlling an applied voltage which is applied to the transparent electrodes. The transparent electrode includes a center part and a plurality of outer peripheral divided parts divided around the center part. When the diameter of an incident area of the laser beam corresponding to the pupil diameter of the objective lens on the liquid crystal panel is set to be 'D1' and the diameter of the center part is set to be 'D2', (D2/D1) is set at a value in the range from about 0.5 to about 0.65.
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