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    • 30. 发明申请
    • OPTICAL DISC APPARATUS, OPTICAL DISC DETERMINATION METHOD, PROGRAM, AND INTEGRATED CIRCUIT
    • 光盘设备,光盘测定方法,程序和集成电路
    • US20080165661A1
    • 2008-07-10
    • US11968746
    • 2008-01-03
    • Tooru MARUYAMAKenji FUJIUNEMotoshi ITO
    • Tooru MARUYAMAKenji FUJIUNEMotoshi ITO
    • G11B7/00
    • G11B19/12G11B7/0908G11B7/1275G11B2007/0006
    • An optical disc drive apparatus determines which one of a plurality of discs with different specifications has been mounted on the apparatus in a short time as well as in a safe manner without damaging information recorded on the disc. An optical disc apparatus 100 illuminates an optical disc 1 simultaneously with a first laser beam and a second laser beam that have been mixed by a laser beam mixing and separating unit. The second laser beam has a shorter wavelength than the first laser beam. An objective lens 29 focuses the first laser beam and the second laser beam in a manner that the first laser beam has a greater focal length than the second laser beam. An information recording surface of the optical disc 1 is first illuminated with the first laser beam having a long wavelength. This eliminates the risk of damaging the information recording surface of the optical disc 1.
    • 光盘驱动装置确定具有不同规格的多个盘中的哪一个已经在短时间以及安全的方式安装在装置上,而不损坏记录在盘上的信息。 光盘装置100与通过激光束混合分离单元混合的第一激光束和第二激光束同时照射光盘1。 第二激光束的波长比第一激光束短。 物镜29以第一激光束具有比第二激光束更大的焦距的方式聚焦第一激光束和第二激光束。 首先用长波长的第一激光束照射光盘1的信息记录表面。 这消除了损坏光盘1的信息记录表面的风险。