Title:
METHOD AND APPARATUS FOR CORRECTING TILT, OPTICAL PICKUP, AND INFORMATION RECORDING/REPRODUCING APPARATUS
Document Type and Number:
WIPO Patent Application WO/2011/151909
Kind Code:
A1
Abstract:
Disclosed is a tilt correction method wherein tilt correction relating to an optical disc (20) is performed, said optical disc having a guide layer (21) that has a track previously formed thereon, and a plurality of recording layers (22) laminated on the guide layer. The tilt correction method is provided with: a first drive quantity calculating step wherein, on the basis of return light from the guide layer for a first light beam (L2) for tracking, a first drive quantity, i.e., a drive quantity of a first aberration correcting means (LC2), is calculated so as to correct coma aberration relating to the first light beam; a second calculating step wherein, on the basis of the calculated first drive quantity and recording layer information relating to one recording layer among the recording layers, a second drive quantity, i.e., a drive quantity of a second aberration correcting means (LC1), is calculated so as to correct coma aberration relating to a second light beam (L1) for recording/reproduction; and a control step wherein, while controlling the first aberration correcting means corresponding to the calculated first drive quantity, the second aberration correcting means is controlled corresponding to the calculated second drive quantity.
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Inventors:
OGASAWARA, Masakazu (Kawasaki Plant. 1-1 Shin-ogura, Saiwai-ku, Kawasaki-sh, Kanagawa 31, 〒2120031, JP)
Application Number:
JP2010/059445
Publication Date:
December 08, 2011
Filing Date:
June 03, 2010
Export Citation:
Assignee:
PIONEER CORPORATION (1-1 Shin-ogura, Saiwai-ku Kawasaki-sh, Kanagawa 31, 〒2120031, JP)
パイオニア株式会社 (〒31 神奈川県川崎市幸区新小倉１番１号 Kanagawa, 〒2120031, JP)
パイオニア株式会社 (〒31 神奈川県川崎市幸区新小倉１番１号 Kanagawa, 〒2120031, JP)
International Classes:
G11B7/095; G11B7/135
Attorney, Agent or Firm:
EGAMI, Tatsuo et al. (3rd Floor Oak Building Kyobashi, 16-10, Kyobashi 1-chome, Chuou-k, Tokyo 31, 〒1040031, JP)
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Claims:
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