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.
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Inventors:
NISHI NORIAKI (JP)
SAITO KIMIHIRO (JP)
ANDO NOBUHIKO (JP)
NAKANO FUMIAKI (JP)
SUZUKI YUUICHI (JP)
NAKAGAWA HIROAKI (JP)
INOUE TETSUYA (JP)
TENTAKU YUTAKA (JP)
SAITO KIMIHIRO (JP)
ANDO NOBUHIKO (JP)
NAKANO FUMIAKI (JP)
SUZUKI YUUICHI (JP)
NAKAGAWA HIROAKI (JP)
INOUE TETSUYA (JP)
TENTAKU YUTAKA (JP)
Application Number:
PCT/JP2016/002104
Publication Date:
December 29, 2016
Filing Date:
April 20, 2016
Export Citation:
Assignee:
SONY CORP (JP)
International Classes:
G11B7/09; G11B7/13; G11B20/10
Domestic Patent References:
| WO2014057674A1 | 2014-04-17 |
Foreign References:
| JP2002025092A | 2002-01-25 | |||
| JP2005135539A | 2005-05-26 | |||
| JP2015057748A | 2015-03-26 |
Attorney, Agent or Firm:
SUGIURA, Masatomo et al. (JP)
Masatomo Sugiura (JP)
Masatomo Sugiura (JP)
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