Title:
OPTICAL DISC DEVICE, OPTICAL PICKUP, AND OPTICAL RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2011/024692
Kind Code:
A1
Abstract:
A spherical aberration can be appropriately corrected.
An optical disc device (10) displaces an object lens (18) to a reference lens position (SL) serving as a reference. The optical disc device (10) controls an information light-focusing-point changing mechanism (55) so that, under the condition that the object lens (18) is positioned at the reference lens position (SL), the focus (FM) of an information light beam (LM) is focused on a recording depth (X) to be illuminated by the information light beam (LM). The optical disc device (10) controls a servo light-focusing-point changing mechanism (35) so that, under the condition that the object lens (18) is positioned at the reference lens position (SL), the focus (FS) of a servo light beam (LS) is focused on a servo layer (104).
Inventors:
TANABE NORIHIRO (JP)
SAITO KIMIHIRO (JP)
SAITO KIMIHIRO (JP)
Application Number:
PCT/JP2010/063952
Publication Date:
March 03, 2011
Filing Date:
August 12, 2010
Export Citation:
Assignee:
SONY CORP (JP)
TANABE NORIHIRO (JP)
SAITO KIMIHIRO (JP)
TANABE NORIHIRO (JP)
SAITO KIMIHIRO (JP)
International Classes:
G11B7/135; G11B7/09; G11B7/125; G11B7/24
Domestic Patent References:
| WO2008099708A1 | 2008-08-21 |
Foreign References:
| JP2009009635A | 2009-01-15 | |||
| JP2003109219A | 2003-04-11 | |||
| JP2000315323A | 2000-11-14 | |||
| JP2009277302A | 2009-11-26 | |||
| JP2009009635A | 2009-01-15 | |||
| JP2009009634A | 2009-01-15 | |||
| JP2008071433A | 2008-03-27 |
Other References:
O. KAWAKUBO; S. TAKAGAWA; M. ONO; M. YAMADA, JPN. J. APPL. PHYS., vol. 39, 2000, pages 756
Attorney, Agent or Firm:
TANABE Shigemoto (JP)
Tanabe Blessing machine (JP)
Tanabe Blessing machine (JP)
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