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    • 2. 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。
    • 3. 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
    • Splitting element, light emitter, and optical pickup apparatus
    • 分离元件,光发射器和光学拾取装置
    • US07649825B2
    • 2010-01-19
    • US10551365
    • 2004-03-19
    • Kazuhiro TsuchidaToshiya NagahamaKeiji SakaiTetsuo UeyamaKatsushige MasuiNaotaka Otsuka
    • Kazuhiro TsuchidaToshiya NagahamaKeiji SakaiTetsuo UeyamaKatsushige MasuiNaotaka Otsuka
    • G11B7/00
    • G11B7/1353G11B7/0901G11B2007/0013
    • An object of the invention is to provide a splitter, a light emitter, and an optical pickup apparatus which can realize a stable track servo. Because of the structure of an optical system including an objective lens (27) and a hologram pattern (25), even when the hologram pattern (25) is irradiated with a reflected light from one recording layer other than another recording layer in a focused state, first and second TES splitting portions (35, 36) are not irradiated with the reflected light from the one recording layer, but the reflected light is led to an axis vicinity portion (38) only. Accordingly, light reception by first and second TES light receiving portions (45, 46) is prevented, accurate track position information and deviation information can be positively acquired, and troubles such as the objective lens (27) being driven beyond a movable range can be eliminated.
    • 本发明的目的是提供一种能够实现稳定轨道伺服的分路器,光发射器和光拾取装置。 由于包括物镜(27)和全息图(25)的光学系统的结构,即使当全息图图案(25)在聚焦状态下从除另一个记录层之外的一个记录层的反射光照射时 第一和第二TES分割部分(35,36)不被来自一个记录层的反射光照射,但是反射光仅被引导到轴附近部分(38)。 因此,能够防止由第一和第二TES光接收部分(45,46)的光接收,可以肯定地获取精确的轨道位置信息和偏差信息,并且诸如物镜(27)被驱动超出可移动范围的问题可以是 消除了