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    • 1. 发明授权
    • Optical pickup apparatus
    • 光拾取装置
    • US07664005B2
    • 2010-02-16
    • US11704953
    • 2007-02-12
    • Shigeharu KimuraTakeshi Shimano
    • Shigeharu KimuraTakeshi Shimano
    • G11B7/00
    • G11B7/1378G11B7/0903G11B7/1362G11B2007/0013
    • The adverse influence of reflected light from adjacent layers as stray light on a control signal or data signal is reduced when tracking a multilayered optical disc using differential push-pull method. The reflected light from the optical disc including stray light from an adjacent layer is once condensed with a condenser lens having little aberration and is then reflected by a reflecting mirror having a partial reflecting region. The resultant reflected light, which has the influence of stray light reduced, passes through a polarization beam splitter and becomes incident on a four-quadrant detector (for main beam) and a split detector (for sub beam) via a condenser lens having astigmatic aberration.
    • 当使用差分推挽方法跟踪多层光盘时,来自相邻层的反射光作为杂散光对控制信号或数据信号的不良影响降低。 来自包括来自相邻层的杂散光的来自光盘的反射光一旦与具有很小像差的聚光透镜一起聚焦,然后被具有部分反射区域的反射镜反射。 所产生的受杂散光影响的反射光通过偏振分束器并通过具有散光像差的聚光透镜入射到四象限检测器(用于主光束)和分割检测器(用于子光束) 。
    • 3. 发明授权
    • Optical pickup apparatus
    • 光拾取装置
    • US07796488B2
    • 2010-09-14
    • US12051092
    • 2008-03-19
    • Shigeharu KimuraTakeshi Shimano
    • Shigeharu KimuraTakeshi Shimano
    • G11B7/00
    • G11B7/1381G11B7/1362G11B2007/0013
    • An optical pickup apparatus aiming at reduction of adverse effect on a tracking control signal and a data signal by preventing the reflected light from the adjacent layers of a multilayer disc changing to a stray light. In this optical pickup apparatus, the reflected light from the optical disc including the stray light from the adjacent layer is once focused with a focusing lens and is then reflected with the reflection plate. A flat attenuation element is provided between the lens and the reflection plate parallel to the optical axis with inclusion of the optical axis under the condition separated from the reflection plate. The reflection plate reflects the reflected light from the relevant layer and the attenuation element shields the reflected light from the adjacent layer. The light returning to the focusing lens includes less influence of the stray light. This light is detected with a detector to become a control signal and a data signal.
    • 一种光学拾取装置,旨在通过防止来自多层盘的相邻层的反射光变成杂散光来减少对跟踪控制信号和数据信号的不利影响。 在该光学拾取装置中,来自包括来自相邻层的杂散光的光盘的反射光一度被聚焦透镜聚焦,然后与反射板反射。 在与反射板分离的条件下包括光轴,在透镜和平行于光轴的反射板之间设置平坦的衰减元件。 反射板反射来自相关层的反射光,并且衰减元件屏蔽来自相邻层的反射光。 返回到聚焦透镜的光包括杂散光的影响较小。 用检测器检测该光以成为控制信号和数据信号。
    • 4. 发明申请
    • OPTICAL PICKUP APPARATUS
    • US20090016180A1
    • 2009-01-15
    • US12051092
    • 2008-03-19
    • Shigeharu KIMURATakeshi Shimano
    • Shigeharu KIMURATakeshi Shimano
    • G11B7/00
    • G11B7/1381G11B7/1362G11B2007/0013
    • An optical pickup apparatus aiming at reduction of adverse effect on a tracking control signal and a data signal by preventing the reflected light from the adjacent layers of a multilayer disc changing to a stray light. In this optical pickup apparatus, the reflected light from the optical disc including the stray light from the adjacent layer is once focused with a focusing lens and is then reflected with the reflection plate. A flat attenuation element is provided between the lens and the reflection plate parallel to the optical axis with inclusion of the optical axis under the condition separated from the reflection plate. The reflection plate reflects the reflected light from the relevant layer and the attenuation element shields the reflected light from the adjacent layer. The light returning to the focusing lens includes less influence of the stray light. This light is detected with a detector to become a control signal and a data signal.
    • 一种光学拾取装置,旨在通过防止来自多层盘的相邻层的反射光变成杂散光来减少对跟踪控制信号和数据信号的不利影响。 在该光学拾取装置中,来自包括来自相邻层的杂散光的光盘的反射光一度被聚焦透镜聚焦,然后与反射板反射。 在与反射板分离的条件下包括光轴,在透镜和平行于光轴的反射板之间设置平坦的衰减元件。 反射板反射来自相关层的反射光,并且衰减元件屏蔽来自相邻层的反射光。 返回到聚焦透镜的光包括杂散光的影响较小。 用检测器检测该光以成为控制信号和数据信号。
    • 5. 发明申请
    • OPTICAL DISC DRIVE APPARATUS
    • 光盘驱动器
    • US20070268807A1
    • 2007-11-22
    • US11669223
    • 2007-01-31
    • Shigeharu KimuraTakeshi Shimano
    • Shigeharu KimuraTakeshi Shimano
    • G11B7/00
    • G11B7/1367G11B7/131G11B7/1362G11B7/1381G11B7/1392G11B2007/0013
    • The amount of reflected light from an adjacent layer in a multilayer optical disc is reduced by means of a combination of half-wave plates having different optical axes and a flat mirror. The polarization direction of the reflected light from a target layer is changed without changing the polarization direction of reflected light from the adjacent layer so as to detect a signal from the target layer alone. Because no stray light is introduced into the tracking error signal or focus signal, the laser light irradiated position can be controlled with high accuracy. This makes it possible to accurately determine the laser irradiated position during reading and writing, thereby enhancing signal quality. Because no reflected light from the adjacent layer is introduced into the data signal, a data signal with reduced error can be obtained.
    • 通过具有不同光轴的半波片和平面镜的组合来减少来自多层光盘中的相邻层的反射光的量。 改变来自目标层的反射光的偏振方向,而不改变来自相邻层的反射光的偏振方向,从而仅检测来自目标层的信号。 由于没有杂散光被引入到跟踪误差信号或聚焦信号中,因此可以高精度地控制激光照射位置。 这使得可以在读取和写入期间准确地确定激光照射位置,从而提高信号质量。 由于没有将来自相邻层的反射光引入到数据信号中,所以可以获得具有减小的误差的数据信号。
    • 8. 发明授权
    • Optical disc drive apparatus
    • 光盘驱动装置
    • US07639588B2
    • 2009-12-29
    • US11669223
    • 2007-01-31
    • Shigeharu KimuraTakeshi Shimano
    • Shigeharu KimuraTakeshi Shimano
    • G11B7/00
    • G11B7/1367G11B7/131G11B7/1362G11B7/1381G11B7/1392G11B2007/0013
    • The amount of reflected light from an adjacent layer in a multilayer optical disc is reduced by means of a combination of half-wave plates having different optical axes and a flat mirror. The polarization direction of the reflected light from a target layer is changed without changing the polarization direction of reflected light from the adjacent layer so as to detect a signal from the target layer alone. Because no stray light is introduced into the tracking error signal or focus signal, the laser light irradiated position can be controlled with high accuracy. This makes it possible to accurately determine the laser irradiated position during reading and writing, thereby enhancing signal quality. Because no reflected light from the adjacent layer is introduced into the data signal, a data signal with reduced error can be obtained.
    • 通过具有不同光轴的半波片和平面镜的组合来减少来自多层光盘中的相邻层的反射光的量。 改变来自目标层的反射光的偏振方向,而不改变来自相邻层的反射光的偏振方向,从而仅检测来自目标层的信号。 由于没有杂散光被引入到跟踪误差信号或聚焦信号中,因此可以高精度地控制激光照射位置。 这使得可以在读取和写入期间准确地确定激光照射位置,从而提高信号质量。 由于没有将来自相邻层的反射光引入到数据信号中,所以可以获得具有减小的误差的数据信号。
    • 9. 发明申请
    • Optical pickup apparatus
    • 光拾取装置
    • US20080127238A1
    • 2008-05-29
    • US11704953
    • 2007-02-12
    • Shigeharu KimuraTakeshi Shimano
    • Shigeharu KimuraTakeshi Shimano
    • G11B7/08G11B7/00
    • G11B7/1378G11B7/0903G11B7/1362G11B2007/0013
    • The adverse influence of reflected light from adjacent layers as stray light on a control signal or data signal is reduced when tracking a multilayered optical disc using differential push-pull method. The reflected light from the optical disc including stray light from an adjacent layer is once condensed with a condenser lens having little aberration and is then reflected by a reflecting mirror having a partial reflecting region. The resultant reflected light, which has the influence of stray light reduced, passes through a polarization beam splitter and becomes incident on a four-quadrant detector (for main beam) and a split detector (for sub beam) via a condenser lens having astigmatic aberration.
    • 当使用差分推挽方法跟踪多层光盘时,来自相邻层的反射光作为杂散光对控制信号或数据信号的不良影响降低。 来自包括来自相邻层的杂散光的来自光盘的反射光一旦与具有很小像差的聚光透镜一起聚焦,然后被具有部分反射区域的反射镜反射。 所产生的受杂散光影响的反射光通过偏振分束器并通过具有散光像差的聚光透镜入射到四象限检测器(用于主光束)和分割检测器(用于子光束) 。