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    • 1. 发明授权
    • Optical pickup and optical disc device
    • 光学拾取和光盘设备
    • US08259553B2
    • 2012-09-04
    • US12703294
    • 2010-02-10
    • Fumiaki NakanoNobuhiko AndoNoriaki NishiTakashi NakaoHiroaki NakagawaYutaka Tentaku
    • Fumiaki NakanoNobuhiko AndoNoriaki NishiTakashi NakaoHiroaki NakagawaYutaka Tentaku
    • G11B7/135
    • G11B7/1353G11B7/0903G11B7/131G11B2007/0013
    • An optical pickup includes: a light source outputting a light beam; an objective lens collecting the light beam on a target recording layer as a target of plural recording layers provided in an optical disc; a lens moving unit moving the objective lens in a tracking direction nearly orthogonal to track grooves helically or coaxially formed in the target recording layer; a collective lens collecting a reflected light beam formed when the light beam is reflected by the optical disc; a diffraction optical element diffracting part of the reflected first-order light beam in predetermined directions as first, second, third and fourth beams; and a photodetector receiving the first and second beams using first and second light receiving areas, and generating light reception signals, and receiving the third and fourth beams using third and fourth light receiving areas, and generates light reception signals.
    • 光拾取器包括:输出光束的光源; 将目标记录层上的光束收集成设置在光盘中的多个记录层的目标物的物镜; 透镜移动单元,沿跟踪方向移动所述物镜,所述跟踪方向与所述目标记录层中螺旋或同轴地形成的轨道槽几乎正交; 收集当光束被光盘反射时形成的反射光束的集体透镜; 衍射光学元件将预定方向的反射一次光束的一部分衍射为第一,第二,第三和第四光束; 以及光电检测器,其使用第一和第二光接收区域接收第一和第二光束,并且产生光接收信号,并且使用第三和第四光接收区域接收第三和第四光束,并且产生光接收信号。
    • 3. 发明申请
    • OPTICAL PICKUP AND OPTICAL DISC DEVICE
    • 光学拾取和光盘设备
    • US20100214902A1
    • 2010-08-26
    • US12703294
    • 2010-02-10
    • Fumiaki NakanoNobuhiko AndoNoriaki NishiTakashi NakaoHiroaki NakagawaYutaka Tentaku
    • Fumiaki NakanoNobuhiko AndoNoriaki NishiTakashi NakaoHiroaki NakagawaYutaka Tentaku
    • G11B7/135
    • G11B7/1353G11B7/0903G11B7/131G11B2007/0013
    • An optical pickup includes: a light source outputting a light beam; an objective lens collecting the light beam on a target recording layer as a target of plural recording layers provided in an optical disc; a lens moving unit moving the objective lens in a tracking direction nearly orthogonal to track grooves helically or coaxially formed in the target recording layer; a collective lens collecting a reflected light beam formed when the light beam is reflected by the optical disc; a diffraction optical element diffracting part of the reflected first-order light beam in predetermined directions as first, second, third and fourth beams; and a photodetector receiving the first and second beams using first and second light receiving areas, and generating light reception signals, and receiving the third and fourth beams using third and fourth light receiving areas, and generates light reception signals.
    • 光拾取器包括:输出光束的光源; 将目标记录层上的光束收集成设置在光盘中的多个记录层的目标物的物镜; 透镜移动单元,沿跟踪方向移动所述物镜,所述跟踪方向与所述目标记录层中螺旋或同轴地形成的轨道槽几乎正交; 收集当光束被光盘反射时形成的反射光束的集体透镜; 衍射光学元件将预定方向的反射一次光束的一部分衍射为第一,第二,第三和第四光束; 以及光电检测器,其使用第一和第二光接收区域接收第一和第二光束,并且产生光接收信号,并且使用第三和第四光接收区域接收第三和第四光束,并且产生光接收信号。
    • 6. 发明授权
    • Optical pickup apparatus and signal recording and/or reproducing apparatus
    • 光学拾取装置和信号记录和/或再现装置
    • US07154839B2
    • 2006-12-26
    • US10610995
    • 2003-07-01
    • Naohiro NetsuNobuhiko Ando
    • Naohiro NetsuNobuhiko Ando
    • G11B7/00
    • G11B7/1356G11B7/082G11B7/08582G11B7/12
    • While supporting an optical disc having a recording density that is higher than conventional optical discs by shortening the wavelength of the emitted light and increasing the numerical aperture (NA) of an objective lens, a reduction in the size of an optical pickup apparatus relative to the size of a disc cartridge that houses the optical disc is achieved. The present invention includes a fixed optical system having a built-in light source, and a movable optical system having an objective lens. A parallel light beam that enters the movable optical system from the fixed optical system enters the movable optical system via a light path that is parallel to the direction in which the objective lens is movable and from the side on which a spindle motor is provided.
    • 通过缩短发射光的波长并增加物镜的数值孔径(NA)来支持具有高于常规光盘的记录密度的光盘,相对于光学拾取装置的尺寸的减小 实现容纳光盘的盘盒的尺寸。 本发明包括具有内置光源的固定光学系统和具有物镜的可移动光学系统。 从固定光学系统进入可移动光学系统的平行光束通过平行于物镜可移动方向的光路和从设置有主轴电机的一侧进入可移动光学系统。
    • 7. 发明授权
    • Optical pickup with a hologram to limit the aperture of two light beams with different wavelengths
    • 具有全息图的光学拾取器,以限制具有不同波长的两个光束的孔径
    • US06392977B2
    • 2002-05-21
    • US09445695
    • 1999-12-13
    • Nobuhiko AndoKazuhiko Fujiie
    • Nobuhiko AndoKazuhiko Fujiie
    • G11B700
    • G11B7/1353G11B7/131G11B7/1356G11B7/1365G11B7/139G11B7/13922G11B11/10543G11B11/10597G11B2007/0006G11B2007/13727
    • An optical pickup device that is able to record/reproduce information signals for first and second optical discs with different recording capacities. The optical pickup device includes an objective lens for converging first and second light beams of different wavelengths on the signal recording layers of first and second optical discs having different substrate thicknesses, a beam splitter having the same transmittance to the first and second light beams and configured for separating the first and second light beams radiated by first and second light sources to fall on the beam splitter via a first objective lens or a second objective lens, and a hologram element arranged between the objective lens and the beam splitter for limiting the aperture of one of the first light beam and the second light beam and for correcting the spherical aberration caused by difference in the disc substrate thickness of the first and second optical discs. This configuration enables various optical elements, such as objective lens or beam splitter, to be used in common for the optical disc of different recording capacities.
    • 一种能够记录/再现具有不同记录容量的第一和第二光盘的信息信号的光学拾取装置。 该光学拾取装置包括用于在具有不同衬底厚度的第一和第二光盘的信号记录层上会聚不同波长的第一和第二光束的物镜,对第一和第二光束具有相同透射率的分束器, 用于分离由第一和第二光源辐射的第一和第二光束经由第一物镜或第二物镜落在分束器上,以及布置在物镜和分束器之间的全息元件,用于限制 第一光束和第二光束中的一个,并且用于校正由第一和第二光盘的盘基板厚度的差异引起的球面像差。 该配置使得能够将各种光学元件(例如物镜或分束器)共同用于不同记录容量的光盘。
    • 8. 发明授权
    • Optical pickup device
    • 光学拾取装置
    • US06252686B1
    • 2001-06-26
    • US09214255
    • 1999-04-15
    • Nobuhiko Ando
    • Nobuhiko Ando
    • G02B532
    • G11B7/1353G11B7/1398
    • An optical pickup device in which a light beam radiated from a semiconductor laser element is converted by a collimator lens into collimated light beam which is converged by an objective lens so as to be illuminated on an optical disc. A beam shaping element having a hologram pattern on its incident surface and/or its radiating surface is provided on a divergent optical path of the radiated light beam from the semiconductor laser element between the semiconductor laser element and the collimator lens for shaping the light beam radiated from the semiconductor laser element for forming a beam spot of an optimum shape on the optical disc.
    • 一种光学拾取装置,其中从半导体激光元件辐射的光束被准直透镜转换成被物镜会聚的准直光束,以被照射在光盘上。 在半导体激光元件和准直透镜之间的半导体激光元件的辐射光束的发散光路上设置有在其入射表面和/或其辐射表面上具有全息图图案的光束成形元件,用于使辐射光束 从用于在光盘上形成最佳形状的光斑的半导体激光元件。
    • 9. 发明授权
    • Photodetector for recording/reproducing apparatus for both read only and
magneto-optical disk shaped recording medium
    • 用于只读和磁光盘形记录介质的记录/再现装置的光检测器
    • US5453607A
    • 1995-09-26
    • US253669
    • 1994-06-03
    • Nobuhiko AndoRyo AndoKazuhiko Fujiie
    • Nobuhiko AndoRyo AndoKazuhiko Fujiie
    • G11B7/00G11B7/004G11B7/005G11B7/09G11B7/095G11B7/13G11B11/10G11B11/105G11B13/04G11B19/00G11B19/12G01J1/20
    • G11B7/131G11B11/10597G11B13/04G11B19/00G11B19/12G11B7/005G11B7/0903G11B7/0909G11B7/0941G11B7/0943
    • A recording and/or reproducing apparatus for a disc-shaped optical recording medium includes a rotation drive mechanism, a head device, a discriminating device, a first processing device, a second processing device, a third processing device and a controller. A disc-shaped optical recording medium is loaded on the rotation drive mechanism and is run in rotation at a constant linear velocity. The head device includes a laser light source and a photodetector unit and is movable in the radial direction of the disc-shaped optical recording medium for recording/reproducing information signal on or from the disc-shaped optical recording medium. The discriminating device discriminates the type of the disc-shaped optical recording medium loaded on the rotation driving device. The photodetector unit includes first, second and third photodetectors. The first processing circuit takes a difference between output signals from the first photodetector and those from the second photodetector. The second processing circuit takes a sum of output signals from the first photodetector and those from the second photodetector. The third photodetector generates an error signal based on an output signal from the third photodetector. The controller selectively changes over an output from the first processing circuit to an output from the second processing circuit and vice versa based on a detection output from the discriminating device to produce reproducing signals.
    • 用于盘形光记录介质的记录和/或再现装置包括旋转驱动机构,头装置,识别装置,第一处理装置,第二处理装置,第三处理装置和控制器。 盘形光记录介质装载在旋转驱动机构上,并以恒定的线速度旋转运动。 头装置包括激光光源和光电检测器单元,并且可在盘形光记录介质的径向方向上移动,用于在盘形光记录介质上记录/再现信息信号。 鉴别装置鉴别装在旋转驱动装置上的盘形光学记录介质的类型。 光检测器单元包括第一,第二和第三光电检测器。 第一处理电路从第一光电检测器的输出信号和来自第二光电检测器的输出信号之间取差。 第二处理电路从第一光电检测器和来自第二光电检测器的输出信号的和。 第三光电检测器基于来自第三光电检测器的输出信号产生误差信号。 控制器基于来自识别装置的检测输出,选择性地将来自第一处理电路的输出切换到来自第二处理电路的输出,反之亦然,以产生再现信号。