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    • 3. 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。
    • 5. 发明授权
    • Optical disk apparatus
    • 光盘装置
    • US07715287B2
    • 2010-05-11
    • US11746681
    • 2007-05-10
    • Takeshi ShimanoHarukazu Miyamoto
    • Takeshi ShimanoHarukazu Miyamoto
    • G11B7/00
    • G11B7/1362G11B7/1356G11B7/1365
    • Provided is an optical disc apparatus including an interference-type optical disk signal detection system, which allows an optical path difference between two kinds of light to be controlled easily, which has a high signal amplification effect, and which is suitable for miniaturization of an optical system. An interference-type optical system is integrally formed to stabilize an optical path difference between signal light and reference light. At the same time, means for controlling an optical path length of the reference light is attached to a reference mirror, and thereby controls signal amplitude so as to be constantly set the maximum in response to a change in the optical path length with time due to a variation in the thickness of a cover layer of an optical disk, a temperature and the like. Moreover, the optical system is miniaturized by using a Twyman-Green type interference optical system.
    • 提供了一种包括干涉型光盘信号检测系统的光盘装置,其能够容易地控制两种光之间的光路差异,其具有高的信号放大效应,并且适合于光学的小型化 系统。 整体形成干涉型光学系统,以稳定信号光与参考光之间的光程差。 同时,用于控制参考光的光程长度的装置附加到参考反射镜,从而控制信号幅度,以便随着时间的流逝随时间的变化而恒定地设定最大值 光盘的覆盖层的厚度的变化,温度等。 此外,通过使用Twyman-Green型干涉光学系统,光学系统被小型化。
    • 7. 发明授权
    • Optical disk device having optical phase compensator
    • 具有光学相位补偿器的光盘装置
    • US5784347A
    • 1998-07-21
    • US597406
    • 1996-02-08
    • Harukazu MiyamotoTakeshi ShimanoHisataka SugiyamaMariko Umeda
    • Harukazu MiyamotoTakeshi ShimanoHisataka SugiyamaMariko Umeda
    • G11B11/105G11B7/00
    • G11B11/10595G11B11/10515G11B11/10543G11B11/10584
    • An optical disk device having a light source for emitting light, focusing optics for radiating and focusing the light onto an optical recording medium, a photo-detection system for photoelectrically transforming reflected light from the optical recording medium, a reproduction circuit for reproducing information recorded on the optical recording medium by using an electric signal from the photo-detection system, phase control optics for changing the phase of the reflected light, a readout control circuit for controlling the quantity of the phase change of the phase control optics, and a learning control circuit for calculating the optimum value of the phase change quantity by monitoring the output signal of the reproduction circuit while changing the quantity of the phase change by the readout control circuit. Thus, information can be reproduced from a recording medium having high recording density without crosstalk.
    • 一种具有用于发光的光源的光盘装置,用于将光发射并聚焦到光记录介质上的聚焦光学装置,用于对来自光记录介质的反射光进行光电转换的光检测系统,用于再现记录在 通过使用来自光检测系统的电信号的光记录介质,用于改变反射光的相位的相位控制光学器件,用于控制相位控制光学器件的相位变化量的读出控制电路和学习控制 电路,用于通过在通过读出控制电路改变相变量的同时监视再现电路的输出信号来计算相位变化量的最佳值。 因此,可以从没有串扰的高记录密度的记录介质再现信息。
    • 10. 发明申请
    • Optical Disc Apparatus
    • 光盘装置
    • US20100188961A1
    • 2010-07-29
    • US12754211
    • 2010-04-05
    • Takeshi ShimanoHarukazu Miyamoto
    • Takeshi ShimanoHarukazu Miyamoto
    • G11B7/135
    • G11B7/1362G11B7/1356G11B7/1365
    • An optical disc apparatus includes a laser diode, a first optical component which branches beams from the laser diode into a first beam and a second beam, an objective lens which focuses the first beam on an optical information recording medium, an actuator which drives the objective lens in an optical axis direction, a reference mirror provided in an optical path of the second beam, an optical path length varying unit which varies an optical path length of the second beam, a first photo detector, a second photo detector, a second optical component which branches beams obtained by combining the first beam which is reflected by the optical information recording medium and the second beam which is reflected by the reference mirror and which makes the branched beams incident on the first and second photo detectors, and a signal processing part.
    • 一种光盘装置,包括激光二极管,将激光二极管分束成第一光束的第一光学部件和第二光束,将第一光束聚焦在光学信息记录介质上的物镜,驱动该物镜的致动器 透镜在光轴方向上,设置在第二光束的光路中的参考镜,改变第二光束的光路长度的光程长度变化部,第一光检测器,第二光检测器,第二光检测器 通过组合由光信息记录介质反射的第一光束和被参考反射镜反射并使分支光束入射在第一和第二光电检测器上的第二光束而获得的光束的分量,以及信号处理部分 。