发明申请
- 专利标题: Optical recording medium
- 专利标题(中): 光记录介质
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申请号: US12003913申请日: 2008-01-03
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公开(公告)号: US20080170485A1公开(公告)日: 2008-07-17
- 发明人: Koji Mishima , Hidetake Itoh , Takashi Kikukawa
- 申请人: Koji Mishima , Hidetake Itoh , Takashi Kikukawa
- 申请人地址: JP TOKYO
- 专利权人: TDK CORPORATION
- 当前专利权人: TDK CORPORATION
- 当前专利权人地址: JP TOKYO
- 优先权: JP2007-6477 20070115
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
The optical recording medium includes a first information layer including a first recording film having an extinction coefficient of 0.4 or less at a wavelength of a laser beam used for recording and reproducing, and a second information layer including a second recording film consisting essentially of the same constituent elements as those of the first recording film and having an extinction coefficient of 0.4 or less. Among the first and second information layers, the first information layer is located further away from a laser beam-incident surface than the second information layer located closest to the incident surface. The first information layer further includes a light absorbing film having an extinction coefficient of 1.5 or more at the wavelength of the laser beam, the extinction coefficient of the light absorbing film being greater than that of the first recording film.
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