Title:
OPTICAL DISK DEVICE AND MULTILAYER OPTICAL DISK
Document Type and Number:
WIPO Patent Application WO/2010/113411
Kind Code:
A1
Abstract:
An optical disk device for converging light beams on a multilayer optical disk provided with a plurality of information layers comprises a convergence system including a light source (120) and a solid immersion lens (102), and a convex lens (109) for making the spot size variable when the light beams emitted from the light source are converged in the information layers, a concave lens (110), a movable stage (113), a feed screw (114), a stepping motor (115), and a CPU (200), wherein the concave lens is moved so that the closer an information layer is to the incidence side of the light beams, the smaller the spot size of the light beams is among the plurality of information layers.
Inventors:
FUTAKUCHI RYUTARO
BIRUKAWA MASAHIRO
BIRUKAWA MASAHIRO
Application Number:
PCT/JP2010/001957
Publication Date:
October 07, 2010
Filing Date:
March 18, 2010
Export Citation:
Assignee:
PANASONIC CORP (JP)
FUTAKUCHI RYUTARO
BIRUKAWA MASAHIRO
FUTAKUCHI RYUTARO
BIRUKAWA MASAHIRO
International Classes:
G11B7/004; G11B7/125; G11B7/24038; G11B7/24079; G11B7/24085
Foreign References:
| JP2001184691A | 2001-07-06 | |||
| JP2005339799A | 2005-12-08 | |||
| JP2001202655A | 2001-07-27 | |||
| JPH056571A | 1993-01-14 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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