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Patent Searching and Data


Title:
OPTICAL DISK DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/208104
Kind Code:
A1
Abstract:
This optical disk device divides the cross section of a return beam from a disk into a plurality of regions, and creates a tracking error signal by performing a calculation so as to increase the weighting of the light intensity of the regions, from among the divided regions, positioned at the circumference of an ellipse with a good radial symmetry. Furthermore, the device forms a lens-shift detection signal and cancels the lens-shift detection signal on the basis of a push-pull signal.

Inventors:
NISHI, Noriaki (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
SAITO, Kimihiro (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
ANDO, Nobuhiko (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
NAKANO, Fumiaki (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
SUZUKI, Yuuichi (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
NAKAGAWA, Hiroaki (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
INOUE, Tetsuya (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
TENTAKU, Yutaka (1-7-1 Konan, Minato-k, Tokyo 75, 〒1080075, JP)
Application Number:
JP2016/002104
Publication Date:
December 29, 2016
Filing Date:
April 20, 2016
Export Citation:
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Assignee:
SONY CORPORATION (1-7-1, Konan Minato-k, Tokyo 75, 〒1080075, JP)
International Classes:
G11B7/09; G11B7/13; G11B20/10
Attorney, Agent or Firm:
SUGIURA, Masatomo et al. (402 Kadora Building, 1-1-11 Minami Ikebukuro, Toshima-k, Tokyo 22, 〒1710022, JP)
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