| US 7,542,397 B2 | ||
| Aberration correction apparatus, and control apparatus, control method and control program of optical pickup | ||
| Masakazu Ogasawara, Saitama (Japan); and Toshiharu Ezuka, Saitama (Japan) | ||
| Assigned to Pioneer Corporation, Tokyo (Japan) | ||
| Filed on Mar. 09, 2005, as Appl. No. 11/74,740. | ||
| Claims priority of application No. 2004-065070 (JP), filed on Mar. 09, 2004. | ||
| Prior Publication US 2005/0206731 A1, Sep. 22, 2005 | ||
| Int. Cl. G11B 7/00 (2006.01) | ||
| U.S. Cl. 369—112.02 [369/53.2; 369/112.01; 369/44.23] | 10 Claims |
| 1. An aberration correction apparatus comprising:
an optical pickup having a liquid crystal panel for correcting an aberration of a light beam emitted from a light source and
irradiated on a recording medium; and
a control unit which applies, to the liquid crystal panel, a voltage according to an amount of the aberration in reference
to a bias voltage in order to correct the aberration,
wherein the bias voltage is a voltage at which a diffraction generated in the light beam passing through an electrode gap
portion between electrode portions of the liquid crystal panel is minimum.
|