Title:
光記録媒体、光記録方法、光再生方法、光記録装置および光再生装置。
Document Type and Number:
Japanese Patent JP4393340
Kind Code:
B2
Abstract:
A substrate in which a minute ruggedness structure including columnar projections is formed in a track shape is prepared. The pitch of the columnar projections of the ruggedness structure is set such that a plurality of the columnar projections is within a beam spot. A flat portion is disposed between adjacent tracks. A reflecting layer is formed on the substrate. The flat portion becomes a mirror surface because of the formation of the reflecting layer. The reflectance of the ruggedness structure becomes significantly lower than the reflectance of the flat portion. When the ruggedness structure is irradiated with high-power laser light, a portion of the ruggedness structure is raised to a reflecting layer side and flattened. At this time, reflectance of the raised portion becomes higher than reflectance of a non-raised portion. When a track including the ruggedness structure is irradiated with high-power pulse laser light, signal recording based on a change in reflectance is possible.
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Inventors:
Morio Nakatani
Satoshi Sumi
Masahiro Nakata
Satoshi Sumi
Masahiro Nakata
Application Number:
JP2004304488A
Publication Date:
January 06, 2010
Filing Date:
October 19, 2004
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
G11B7/0045; G11B7/005; G11B7/24035; G11B7/24076; G11B7/24079; G11B7/24085; G11B7/24091
Domestic Patent References:
| JP5197966A |
Other References:
次世代光ディスク規格「Blu-ray Disc」の全貌,日経エレクトロニクス,2002年 3月11日,p.79-80
Attorney, Agent or Firm:
Masamasa Shibano