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    • 2. 发明授权
    • Optical pickup and an optical pickup objective lense assembling method
    • 光学拾取和光学拾取物镜组合方法
    • US6055113A
    • 2000-04-25
    • US35138
    • 1998-03-05
    • Kenji YamamotoIsao IchimuraFumisada MaedaToshio WatanabeAkira SuzukiKiyoshi Ohsato
    • Kenji YamamotoIsao IchimuraFumisada MaedaToshio WatanabeAkira SuzukiKiyoshi Ohsato
    • G11B7/135G11B7/22G02B7/02
    • G11B7/22G11B7/1374G11B2007/13727
    • This invention intends to provide an optical pickup of which it is possible to limit aberrations within a tolerable limit without incorporating a special device for that purpose even if errors arise in thickness of component lenses of a two-lens system constituting an element of the pickup. This object is achieved by providing an optical pickup incorporating a two-lens system with first and second lenses 13 and 14 being arranged in the following manner: the first lens has a first surface 15 to receive a laser beam radiated from a semiconductor laser and a second surface 16 to direct the laser beam transmitted from the first surface 15 towards the second lens 14; the second lens 14 has a third surface 17 to receive the light flux transmitted from the second surface 16 and a fourth surface 18 to direct the light flux transmitted from the third surface 17 towards an optical disc placed opposite thereto; and the first and fourth surfaces are used as a reference during positioning.
    • 本发明旨在提供一种光拾取器,即使在构成拾取器的元件的双透镜系统的分量透镜的厚度上出现误差,也可以将像差限制在可容许极限内,而不需要用于该目的的特殊装置。 该目的通过提供一种包含双透镜系统的光学拾取器来实现,其中第一和第二透镜13和14以如下方式布置:第一透镜具有第一表面15,以接收从半导体激光器辐射的激光束和 第二表面16,用于将从第一表面15传递的激光束引向第二透镜14; 第二透镜14具有第三表面17,用于接收从第二表面16传播的光束和第四表面18,以将从第三表面17传播的光束朝向与其相对放置的光盘; 并且在定位期间将第一和第四表面用作参考。
    • 6. 发明授权
    • Focus controlling apparatus and method, and optical disc drive
    • 对焦控制装置和方法以及光盘驱动器
    • US06674696B1
    • 2004-01-06
    • US09049478
    • 1998-03-27
    • Isao IchimuraFumisada MaedaKenji YamamotoKiyoshi OhsatoToshio Watanabe
    • Isao IchimuraFumisada MaedaKenji YamamotoKiyoshi OhsatoToshio Watanabe
    • G11B700
    • G11B7/094G11B7/0909G11B2007/0006
    • A focus controller for focusing a light beam and positioning the focused light beam onto a signal recording layer of a signal recording media is disclosed. The controller comprises a light beam focusing means having a numerical aperture of 0.6 or more; a focus controlling means for positioning the light beam focused by the light beam focusing means onto the signal recording layer of the recording media; and an offset adjusting means for adjusting an offset between the focused light beam positioned by the focus controlling means and the signal recording layer of the recording media. The controller positions the light beam focused by an objective lens onto the signal recording layer of a recording media; moves the objective lens within a predetermined optical-axial range, detects an amplitude of a signal read from the recording media at either end of the optical-axial range, and adjusts an offset between the focused light beam positioned by the objective lens and the signal recording layer, depending on a difference between the amplitudes of the detected reproduced signal.
    • 公开了一种用于聚焦光束并将聚焦的光束定位在信号记录介质的信号记录层上的聚焦控制器。 控制器包括数值孔径为0.6或更大的光束聚焦装置; 聚焦控制装置,用于将由光束聚焦装置聚焦的光束定位到记录介质的信号记录层上; 以及偏移调整装置,用于调节由聚焦控制装置定位的聚焦光束与记录介质的信号记录层之间的偏移。 控制器将由物镜聚焦的光束定位在记录介质的信号记录层上; 在预定的光轴范围内移动物镜,检测在光轴范围的任一端从记录介质读取的信号的幅度,并调整由物镜定位的聚焦光束与信号之间的偏移 记录层,取决于检测到的再现信号的振幅之差。
    • 7. 发明授权
    • Optical recording medium recording and reproducing apparatus and optical
pickup device
    • 光记录介质记录和再现装置和光学拾取装置
    • US06005834A
    • 1999-12-21
    • US813346
    • 1997-03-07
    • Fumisada MaedaToshio WatanabeIsao IchimuraAtsushi FukumotoKenji YamamotoKiyoshi Ohsato
    • Fumisada MaedaToshio WatanabeIsao IchimuraAtsushi FukumotoKenji YamamotoKiyoshi Ohsato
    • G11B7/00G11B7/004G11B7/09G11B7/125G11B7/135
    • G11B7/1372G11B7/0935G11B7/093
    • An optical recording medium recording and reproducing apparatus for recording information on an optical recording medium and/or reproducing information therefrom by irradiating the optical recording medium with laser light by the use of a two-group objective lens composed of at least first and second lenses. This apparatus is provided with: a light source for emitting laser light; a first lens for converging laser light emitted from the light source; a second lens interposed between the first lens and the optical recording medium; a detecting unit for detecting a kind of the recording medium; and a movement unit for changing the distance in the direction of an optical axis between the first and second lenses by causing a relative movement between the first and second lenses. Further, the distance between the first and second lenses is changed by the movement unit, which causes the second lens to move, according to a result of a detection, which is performed by the detecting unit. Thereby, the numerical aperture NA of the objective lens is increased. Moreover, the influence of aberration is mitigated. Consequently, the high-density recording and reproducing of information signals can be achieved.
    • 一种用于通过使用由至少第一和第二透镜组成的两组物镜通过用激光照射光学记录介质来在光学记录介质上记录信息和/或再现信息的光学记录介质记录和再现装置。 该装置具有:用于发射激光的光源; 用于会聚从光源发射的激光的第一透镜; 插入在第一透镜和光记录介质之间的第二透镜; 检测单元,用于检测记录介质的种类; 以及移动单元,用于通过使第一和第二透镜之间的相对运动来改变在第一和第二透镜之间的光轴方向上的距离。 此外,根据由检测单元执行的检测结果,第一透镜和第二透镜之间的距离被移动单元改变,这导致第二透镜移动。 由此,物镜的数值孔径NA增大。 此外,减轻了像差的影响。 因此,可以实现信息信号的高密度记录和再现。
    • 8. 发明授权
    • Optical pick-up device
    • 光学拾取装置
    • US5712842A
    • 1998-01-27
    • US744007
    • 1996-02-12
    • Kenji YamamotoFumisada MaedaIsao IchimuraKiyoshi OhsatoToshio Watanabe
    • Kenji YamamotoFumisada MaedaIsao IchimuraKiyoshi OhsatoToshio Watanabe
    • G11B7/09G11B7/125G11B7/135G11B7/00
    • B82Y10/00G11B7/1374G11B7/13927G11B7/0908
    • There is provided an optical pick-up device capable of eliminating a spherical aberration due to a thickness error of an optical disc. The optical pick-up device includes a convex lens having a flat surface opposed to a surface of an optical recording medium, and having a predetermined refractive index, and an objective lens disposed such that the convex lens is interposed between said optical recording medium and the objective lens. A position-detecting means detects a position relation between the light-incident surface of the optical recording medium and the flat surface of the convex lens, based on first and second detection signals. A drive means drives the convex lens along an optical axis thereof such that the convex lens is caused to move in the opposite directions toward the optical recording medium or the objective lens, whereby a distance between the light-incident surface of the optical recording medium and the flat surface of the convex lens is controlled based on the first and second detection signals.
    • 提供了能够消除由于光盘的厚度误差引起的球面像差的光学拾取装置。 光学拾取装置包括具有与光学记录介质的表面相对的平坦表面并具有预定折射率的凸透镜,并且设置为使得凸透镜插入在所述光学记录介质和 物镜。 位置检测装置基于第一和第二检测信号检测光记录介质的光入射表面和凸透镜的平坦表面之间的位置关系。 驱动装置沿其光轴驱动凸透镜,使得凸透镜沿相反方向朝向光记录介质或物镜移动,由此光记录介质的光入射表面与 基于第一和第二检测信号来控制凸透镜的平坦表面。
    • 10. 发明授权
    • Lens driving device, optical head and optical disc system
    • 镜头驱动装置,光头和光盘系统
    • US06414931B1
    • 2002-07-02
    • US09159778
    • 1998-09-24
    • Fumisada MaedaIsao IchimuraKenji YamamotoKiyoshi OhsatoToshio Watanabe
    • Fumisada MaedaIsao IchimuraKenji YamamotoKiyoshi OhsatoToshio Watanabe
    • G11B700
    • G11B7/13927G11B7/0927G11B7/0948G11B7/1378G11B2007/13727
    • A recording/reproducing apparatus for an optical recording medium in which a laser light beam is illuminated on an optical recording medium using a double-lens type objective lens made up of at least a first lens and a second lens to record and/or reproduce the information. The apparatus includes a first lens for converging the laser light illuminated from a light source, a second lens arranged between the first lens and the optical recording medium and a voice coil motor for causing relative movement of the first and second lenses for varying the distance therebetween in the direction along the optical axis. The first lens is moved to vary the distance between the first and second lenses. This enlarges the numerical aperture and diminishes the effect of aberration to enable high-density recording and/or reproduction of information signals to a high recording density.
    • 一种用于光记录介质的记录/再现装置,其中使用由至少第一透镜和第二透镜构成的双透镜型物镜将光束照射在光记录介质上以记录和/或再现 信息。 该装置包括用于会聚从光源照射的激光的第一透镜,布置在第一透镜和光学记录介质之间的第二透镜和用于使第一和第二透镜相对移动以改变其间的距离的音圈电机 沿着光轴的方向。 移动第一透镜以改变第一和第二透镜之间的距离。 这扩大了数值孔径并减小了像差的影响,使信息信号的高密度记录和/或再现成为高记录密度。