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    • 7. 发明申请
    • Optical recording medium
    • 光记录介质
    • US20080170485A1
    • 2008-07-17
    • US12003913
    • 2008-01-03
    • Koji MishimaHidetake ItohTakashi Kikukawa
    • Koji MishimaHidetake ItohTakashi Kikukawa
    • G11B7/00
    • G11B7/24038G11B7/2433G11B7/2437G11B2007/24314G11B2007/2432
    • 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.
    • 光记录介质包括第一信息层,包括在用于记录和再现的激光束的波长处具有0.4或更小的消光系数的第一记录膜,以及包括基本上由其组成的第二记录膜的第二信息层 构成要素为第一记录膜的消光系数为0.4以下。 在第一和第二信息层中,第一信息层位于比最接近入射表面的第二信息层更远离激光束入射表面。 第一信息层还包括在激光束的波长处具有1.5或更大的消光系数的光吸收膜,光吸收膜的消光系数大于第一记录膜的消光系数。