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    • 30. 发明申请
    • INFORMATION RECORDING MEDIUM, RECORDING APPARATUS, REPRODUCING APPARATUS AND REPRODUCING METHOD
    • 信息记录介质,记录装置,再现装置和再现方法
    • US20100302921A1
    • 2010-12-02
    • US12745086
    • 2009-11-19
    • Tomoyasu TakaokaShigeru FurumiyaNaoyasu Miyagawa
    • Tomoyasu TakaokaShigeru FurumiyaNaoyasu Miyagawa
    • G11B19/00G11B7/26G11B7/00
    • G11B7/126G11B7/24038
    • An information recording medium, comprising N number (N is an integer fulfilling N≧3) of information layers on which information is recordable, and allowing information to be recorded on each of the information layers and allowing information recorded on each of the information layers to be reproduced by being irradiated with laser light. The N number of information layers include an N'th information layer, an (N−1)th information layer, an (N−2)th information layer, . . . a second information layer and a first information layer sequentially located from a laser light incidence side. A reflectance of the N'th information layer is RN, and a reflectance of an M'th information layer (M refers to every integer fulfilling N>M≧1) is RM. The laser light used to irradiate the N'th information layer for reproducing information recorded on the N'th information layer has an upper limit reproduction power PrNmax, and the laser light used to irradiate the M'th information layer for reproducing information recorded on the M'th information layer has an upper limit reproduction power PrMmax. The following expressions (1) and (2) are concurrently fulfilled: RN>RM   (1) PrNmax
    • 一种信息记录介质,包括可记录信息的信息层的N个数(N是满足N≥3的整数),并且允许将信息记录在每个信息层上并允许记录在每个信息层上的信息 通过用激光照射来再现。 N个信息层包括第N个信息层,第(N-1)个信息层,第(N-2)个信息层。 。 。 第二信息层和从激光入射侧依次定位的第一信息层。 第N个信息层的反射率为RN,第M个信息层(M为满足N>M≥1的每个整数)的反射率为RM。 用于照射第N信息层的用于再现记录在第N信息层上的信息的激光具有上限再现功率PrNmax,并且用于照射第M个信息层的激光用于再现记录在第N信息层上的信息 第M个信息层具有上限再现功率PrMmax。 同时满足下列表达式(1)和(2):RN> RM(1)PrNmax