OPTICAL INFORMATION RECORDING MEDIUM

Japanese Patent JP3961549

B2

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.

JP2001162654	GAS NOZZLE
JP2001071351	APPARATUS FOR PRODUCING DISK AND MOLD FOR THE SAME

Kazuhide Hayashi
Ono Eiji
Masatsugu Mouri

JP2006206207A

August 22, 2007

July 28, 2006

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Matsushita Electric Industrial Co., Ltd

B29C45/26; B29D17/00; G11B7/24; G11B7/24047; G11B7/26; G11B17/028; G11B23/00

JP10106044A
JP9219038A
JP2002184037A
JP2260144A
JP2252151A
JP6333315A
JP6333316A
JP10040578A
JP4048447A
JP4079045A
JP56124175A
JP60013337A
JP2003242680A
JP2003077182A
JP5059613U
JP2004538590A

Takuji Yamada
Mitsuo Tanaka
Mitsuo Wada
Masahiro Ishino
Kazuhisa Inaba

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