Title:
OPTICAL PICKUP, ABERRATION CORRECTION METHOD, OPTICAL PICKUP PROGRAM, INFORMATION RECORDING DEVICE, INFORMATION RECORDING METHOD, INFORMATION RECORDING PROGRAM, INFORMATION REPRODUCING DEVICE, INFORMATION REPRODUCING METHOD, INFORMATION REPRODUCING PROGRAM, AND INFORMATION RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2006/114967
Kind Code:
A1
Abstract:
There is provided an optical pickup capable of accurately performing track search operation by further reducing the noise generated in a focus servo system during track search operation and accurately performing information recording/reproduction onto/from an optical disc. An optical pickup PU applies an optical beam B to an optical disc DK having a recording track of land/groove structure and receives a reflection light of the applied optical beam B. The optical pickup includes: a liquid crystal panel (3) for correcting astigmatism contained in the optical beam B unique to the optical system constituting the optical pickup PU when the tracking servo is in the ON state, and correcting both of the astigmatism and a track crossing noise generated in principle when the tracking servo is in the OFF state; and a liquid crystal panel control unit (8) for switching the liquid crystal panel (3) for operation according to the tracking servo state.
Inventors:
YANAGISAWA TAKUMA (JP)
Application Number:
PCT/JP2006/306130
Publication Date:
November 02, 2006
Filing Date:
March 27, 2006
Export Citation:
Assignee:
PIONEER CORP (JP)
YANAGISAWA TAKUMA (JP)
YANAGISAWA TAKUMA (JP)
International Classes:
G11B7/085; G11B7/09
Foreign References:
| JP2000067453A | 2000-03-03 | |||
| JP2000348371A | 2000-12-15 |
Attorney, Agent or Firm:
Ishikawa, Yasuo (Shiba 2-chome Minato-ku, Tokyo 14, JP)
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