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    • 1. 发明授权
    • Optical pickup apparatus
    • 光拾取装置
    • US07684306B2
    • 2010-03-23
    • US11496814
    • 2006-07-31
    • Kazunori MatsubaraShinzoh MurakamiTetsuo UeyamaKazuhiro TsuchidaYukio WatanabeOsamu Miyazaki
    • Kazunori MatsubaraShinzoh MurakamiTetsuo UeyamaKazuhiro TsuchidaYukio WatanabeOsamu Miyazaki
    • G11B7/00
    • G11B7/1353
    • There is provided an optical pickup apparatus that can obtain a stable servo signal by reducing stray light generated by diffraction in a recording layer other than a recording layer on which light is condensed. A hologram element provided in an optical pickup apparatus for recording information onto a recording medium and/or reproducing information on the recording medium by use of light includes fourth and fifth divisions where at least first-order diffracted light among diffracted light beams obtained by reflection and diffraction on a recording layer other than a light-condensed recording layer on which light is condensed by an objective lens so as not to be directed toward first and second light-receiving elements for detecting focus position information and third to eighth light-receiving elements for detecting track position information.
    • 提供了一种光拾取装置,其可以通过减少除了聚光的记录层之外的记录层中的衍射产生的杂散光,从而获得稳定的伺服信号。 提供在用于通过使用光将信息记录在记录介质上和/或在记录介质上再现信息的光学拾取装置中的全息元件包括第四和第五分割,其中至少一级衍射光通过反射和 除了聚光记录层之外的记录层上的衍射,其中光被物镜聚光,以便不被指向用于检测聚焦位置信息的第一和第二光接收元件和用于检测聚焦位置信息的第三至第八光接收元件 检测轨迹位置信息。
    • 2. 发明申请
    • Optical pickup apparatus
    • 光拾取装置
    • US20070025228A1
    • 2007-02-01
    • US11496814
    • 2006-07-31
    • Kazunori MatsubaraShinzoh MurakamiTetsuo UeyamaKazuhiro TsuchidaYukio WatanabeOsamu Miyazaki
    • Kazunori MatsubaraShinzoh MurakamiTetsuo UeyamaKazuhiro TsuchidaYukio WatanabeOsamu Miyazaki
    • G11B7/135
    • G11B7/1353
    • There is provided an optical pickup apparatus that can obtain a stable servo signal by reducing stray light generated by diffraction in a recording layer other than a recording layer on which light is condensed. A hologram element provided in an optical pickup apparatus for recording information onto a recording medium and/or reproducing information on the recording medium by use of light includes fourth and fifth divisions where at least first-order diffracted light among diffracted light beams obtained by reflection and diffraction on a recording layer other than a light-condensed recording layer on which light is condensed by an objective lens so as not to be directed toward first and second light-receiving elements for detecting focus position information and third to eighth light-receiving elements for detecting track position information.
    • 提供了一种光拾取装置,其可以通过减少除了聚光的记录层之外的记录层中的衍射产生的杂散光,从而获得稳定的伺服信号。 提供在用于通过使用光将信息记录在记录介质上和/或在记录介质上再现信息的光学拾取装置中的全息元件包括第四和第五分割,其中至少一级衍射光通过反射和 除了聚光记录层之外的记录层上的衍射,其中光被物镜聚光,以便不被指向用于检测聚焦位置信息的第一和第二光接收元件和用于检测聚焦位置信息的第三至第八光接收元件 检测轨迹位置信息。
    • 7. 发明授权
    • Optical pickup apparatus
    • 光拾取装置
    • US07952977B2
    • 2011-05-31
    • US12036013
    • 2008-02-22
    • Kazunori MatsubaraShinzoh Murakami
    • Kazunori MatsubaraShinzoh Murakami
    • G11B7/00
    • G11B7/1381G11B7/0906G11B7/0912G11B7/0916G11B7/131G11B7/1353G11B2007/0013
    • A diffracting portion is disposed in an optical path between a light source and an optical disc. The diffracting portion diffracts the reflected light from recording layers of the optical disc toward a light receiving portion. The diffracting portion includes a first diffraction region having a first diffraction efficiency and a second diffraction region having a second diffraction efficiency lower than the first diffraction efficiency. The first diffraction region includes a FES diffracting portion and first to fourth TES diffracting portions. The second diffraction region includes fifth and sixth TES diffracting portions. First-order diffraction lights from the non-light-collecting recording layer enter on the fifth and the sixth TES diffracting portions, and are diffracted toward the light receiving portion by the fifth and the sixth TES diffracting portions.
    • 衍射部分设置在光源和光盘之间的光路中。 衍射部分将来自光盘的记录层的反射光衍射到光接收部分。 衍射部分包括具有第一衍射效率的第一衍射区域和具有低于第一衍射效率的第二衍射效率的第二衍射区域。 第一衍射区域包括FES衍射部分和第一至第四TES衍射部分。 第二衍射区域包括第五和第六TES衍射部分。 来自非集光记录层的一阶衍射光进入第五和第六TES衍射部分,并且通过第五和第六TES衍射部分向光接收部分衍射。