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    • 92. 发明授权
    • Phase compensator and compatible optical pickup using the phase compensator
    • 相位补偿器和使用相位补偿器的兼容光学拾取器
    • US07180846B2
    • 2007-02-20
    • US10284415
    • 2002-10-31
    • Tae-kyung KimYoung-man AhnHae-jung SuhJin-kyung LeeJong-bae KimChong-sam Chung
    • Tae-kyung KimYoung-man AhnHae-jung SuhJin-kyung LeeJong-bae KimChong-sam Chung
    • G02B5/18
    • G11B7/1275G11B7/1367G11B7/13922G11B2007/0006
    • A compatible optical pickup for recording and/or reproducing information on/from multiple kinds of optical discs having different thicknesses by selectively using source lights of respective different wavelengths corresponding to a kind of disc and using a common objective lens. At least one phase compensator, which compensates a phase of a light having a particular wavelength to correct for spherical aberration due to a thickness difference between the kinds of optical discs and/or chromatic aberration due to a wavelength difference between the required source lights, is positioned between the source lights and an entrance pupil of the objective lens. Each phase compensator compensates light of at least one wavelength and passes light of at least one other wavelength without significant relative phase alteration. By using two phase compensators, the optical pickup may be made compatible with at least three kinds of optical discs.
    • 一种兼容的光学拾取器,用于通过选择性地使用对应于一种光盘的各种不同波长的光源并使用公共物镜来在具有不同厚度的多种光盘上记录和/或再现信息。 至少一个相位补偿器补偿具有特定波长的光的相位,以校正由于各种光盘之间的厚度差导致的球面像差和/或由于所需源光之间的波长差导致的色差。 位于源光和物镜的入射光瞳之间。 每个相位补偿器补偿至少一个波长的光并且传递至少一个其它波长的光,而没有显着的相对相位变化。 通过使用两个相位补偿器,光拾取器可以与至少三种光盘相兼容。
    • 99. 发明授权
    • Method of and apparatus for reproducing data recorded on an optical disc
    • 用于再现记录在光盘上的数据的方法和装置
    • US06826142B2
    • 2004-11-30
    • US10046556
    • 2002-01-16
    • Tae-kyung KimYoung-man AhnJong-bae KimChong-sam Chung
    • Tae-kyung KimYoung-man AhnJong-bae KimChong-sam Chung
    • G11B700
    • G11B7/00718G11B7/0053G11B7/00745G11B7/131
    • A method of detecting a reproduction signal from an optical disc. A light beam reflected from a recording surface of an optical disc is divided into a central light beam portion and outer light beam portions in a direction corresponding to a radial direction of the optical disc. The central light beam portion and outer light beam portions are detected and a first detection signal from the central light beam portion and a second detection signal from at least one of the outer light beam portions are output. The amplitude of at least one of the first and second detection signals is adjusted and the reproduction signal is detected by subtraction between the first detection and second detection signals so that where reproduction is carried out on an optical disc having a varying track width the reproduction signal is improved.
    • 一种从光盘检测再现信号的方法。 从光盘的记录表面反射的光束在与光盘的径向相对应的方向上被分成中心光束部分和外部光束部分。 检测中心光束部分和外部光束部分,并且输出来自中心光束部分的第一检测信号和来自外部光束部分中的至少一个的第二检测信号。 调整第一和第二检测信号中的至少一个的振幅,并且通过在第一检测和第二检测信号之间的减法来检测再现信号,使得在对具有变化的轨道宽度的光盘进行再现时,再现信号 改进了