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    • 86. 发明专利
    • Optical information-detecting method, optical head, and optical disk device
    • 光学信息检测方法,光学头和光盘设备
    • JP2008065961A
    • 2008-03-21
    • JP2006245848
    • 2006-09-11
    • Hitachi Ltd株式会社日立製作所
    • MIYAMOTO JIICHIMIKAMI HIDEJISHIMANO TAKESHI
    • G11B7/005G11B7/09G11B7/135
    • G11B7/1356G11B7/005G11B7/13G11B2007/0013
    • PROBLEM TO BE SOLVED: To solve the problem that a reproduction light quantity per unit time is significantly decreased and reproduction quality (S/N) is drastically decreased since an actual reflectance of a medium is low and read-out time is short in a multilayer optical disk and in a high-speed optical disk. SOLUTION: Reflection signal light from an optical disk and reference light, which is branched from the same light source and introduced into a detector without being applied to the optical disk, are made to interfere on the detector. At that time, four kinds of detection outputs, in which the reference light and the signal light are out of phase with one another by 90° each, are simultaneously obtained, and then computation is made to obtain reproduction signals which are always stable and amplified to high quality even if an optical path length varies due to the wobbling in the surface of the optical disk. COPYRIGHT: (C)2008,JPO&INPIT
    • 解决问题:为了解决由于介质的实际反射率低且读出时间短而导致每单位时间的再现光量显着降低并且再现质量(S / N)急剧减小的问题 在多层光盘和高速光盘中。 解决方案:使来自光盘的反射信号光和从同一光源分支并被引入检测器而不被施加到光盘的参考光被干扰到检测器上。 此时,同时获得其中参考光和信号光彼此相差90°的四种检测输出,然后进行计算以获得总是稳定和放大的再现信号 即使由于光盘表面的摆动而导致光路长度变化,也能达到高质量。 版权所有(C)2008,JPO&INPIT