Title:
光情報記録媒体
Document Type and Number:
Japanese Patent JP4105217
Kind Code:
B2
Abstract:
A disc-shaped optical data recording medium has a signal recording layer for reading and/or writing data using light, and a 10 ¼m to 200 ¼m thick transparent protective layer disposed over the signal recording layer. The optical data recording medium includes a protrusion projecting from the surface of the transparent protective layer on the light-incidence surface side to which light is emitted to the signal recording layer. The protrusion is disposed in an area between a center hole and a clamping area (CA) where the optical data recording medium is held when reading and/or writing data in the signal recording layer.
Inventors:
Kazuhide Hayashi
Ono Eiji
Masatsugu Mouri
Ono Eiji
Masatsugu Mouri
Application Number:
JP2007151334A
Publication Date:
June 25, 2008
Filing Date:
June 07, 2007
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
B29C45/26; B29D17/00; G11B7/24; G11B7/24047; G11B7/26; G11B17/028
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Attorney, Agent or Firm:
Takuji Yamada
Mitsuo Tanaka
Mitsuo Wada
Kazuhisa Inaba
Mitsuo Tanaka
Mitsuo Wada
Kazuhisa Inaba