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    • 4. 发明申请
    • Optical disk apparatus
    • 光盘装置
    • US20070183274A1
    • 2007-08-09
    • US11363956
    • 2006-03-01
    • Hiromi KudoTakahiro KurokawaTakeshi ShimanoHarukazu Miyamoto
    • Hiromi KudoTakahiro KurokawaTakeshi ShimanoHarukazu Miyamoto
    • G11B7/00
    • G11B7/0943G11B7/1369
    • An optical disk apparatus for correcting astigmatism that influences the read/ write. If there is astigmatism, and auto-focus and tracking control are in operation, then a push-pull signal amplitude and a 2T signal amplitude vary with the variation of an amount of spherical aberration, resulting in two cases. In one case, the amount of spherical aberration to give the maximum value of push-pull signal amplitude agrees with the amount of spherical aberration to give the maximum value of 2T signal amplitude, and in the other case the two amounts do not agree. If there is no astigmatism, two amounts agree each other. If there in no agreement, then correction is made by using an astigmatism correcting element until the agreement is reached between the two. In the case where two amounts agree, specification is made for the existence and angle of astigmatism, and correction is made by using focus error signals from adjacent tracks.
    • 一种用于校正影响读/写的散光的光盘装置。 如果存在散光,并且自动对焦和跟踪控制正在运行,则推挽信号幅度和2T信号幅度随球面像差量的变化而变化,导致两种情况。 在一种情况下,给出推挽信号幅度的最大值的球面像差的量与给出2T信号幅度的最大值的球面像差量一致,而在另一种情况下,两种量不一致。 如果没有散光,两个数量彼此相符。 如果没有达成协议,则在使用散光矫正元件之前进行校正,直到两者达成一致。 在两个数量一致的情况下,对散光的存在和角度进行规定,并且通过使用来自相邻轨道的聚焦误差信号进行校正。
    • 9. 发明授权
    • Optical head and optical disk device
    • 光头和光盘装置
    • US08023390B2
    • 2011-09-20
    • US12025797
    • 2008-02-05
    • Takeshi ShimanoHarukazu MiyamotoHideharu MikamiJiro Hashizume
    • Takeshi ShimanoHarukazu MiyamotoHideharu MikamiJiro Hashizume
    • G11B7/135
    • G11B7/1378G11B7/0903G11B7/1353G11B7/1356G11B7/1359
    • An interference type optical head and an optical disk device that can easily adjust an optical path length difference of a couple of lights, ensure higher signal amplification effect, and are suitable for reduction in size are provided in order to improve a regeneration signal quality with amplification of signal in the case where reflectivity of each layer must be lowered and relative noise for the signal increases because read speed is high in a multilayer optical disk. In view of essentially improving an S/N ratio of the regeneration signal in high-speed rotation of a multilayer disk, a plurality of interference phases are generated and an optical system for differential calculation has been reduced in size with an angular selective polarization conversion element in the optical disk device for amplifying the signal with interference of the light not radiated to the disk with the reflected light from the disk. Moreover, adjustment of reflection mirror angle of the reference light is no longer required by using a corner cube prism as the reference light reflection mirror and highly accurate signal detection can also be realized with a simplified structure.
    • 可以容易地调整两个光的光程长度差的干涉型光头和光盘装置,确保更高的信号放大效果,并且适合于减小尺寸,以便通过放大来提高再生信号质量 在多层光盘中的读取速度高的情况下,必须降低每一层的反射率和信号的相对噪声的信号。 鉴于在多层盘的高速旋转中基本上提高再生信号的S / N比,产生多个干涉相位,并且用角度选择偏振转换元件的差分计算用光学系统的尺寸减小了 在光盘装置中,用于将没有辐射到盘的光的信号与来自盘的反射光放大的信号。 此外,通过使用角隅棱镜作为参考光反射镜,不再需要对参考光的反射镜角度的调整,并且也可以以简化的结构实现高精度的信号检测。