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Title:
OPTICAL INFORMATION RECORDING MEDIUM
Document Type and Number:
Japanese Patent JP3961549
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide an optical information recording medium having a protrusion part protecting a transparent protective layer and reducing a load to a motor at the time of rotation and capable of obtaining larger disk holding force.
SOLUTION: In the optical data recording medium having a signal substrate, a signal recording layer and the transparent protective layer provided on the signal recording layer and having 10 to 200 μm thickness and further having a center hole, recording or reproduction of data is performed by irradiating the signal recording layer with light through the transparent protective layer, a holding region is formed in a region between a signal region corresponding to a region where the signal recording layer is formed and the center hole, the protrusion part protruding from the surface of the transparent protective layer is provided on a light incident surface side in a region interposed between the center hole and the holding region and the protrusion part is formed by using a material different from the material of the transparent protective layer.


Inventors:
Kazuhide Hayashi
Ono Eiji
Masatsugu Mouri
Application Number:
JP2006206207A
Publication Date:
August 22, 2007
Filing Date:
July 28, 2006
Export Citation:
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Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
G11B7/24; B29C45/26; B29D17/00; G11B7/26; G11B17/028; G11B23/00
Domestic Patent References:
JP10106044A
JP9219038A
JP2002184037A
JP2260144A
JP2252151A
JP6333315A
JP6333316A
JP10040578A
JP4048447A
JP4079045A
JP56124175A
JP60013337A
JP2003242680A
JP2003077182A
JP5059613U
JP2004538590A
Attorney, Agent or Firm:
Takuji Yamada
Mitsuo Tanaka
Mitsuo Wada
Masahiro Ishino
Kazuhisa Inaba