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    Object lens and optical head for reproducing data from optical disks in different thickness of substrate
    1.
    发明授权
    Object lens and optical head for reproducing data from optical disks in different thickness of substrate 失效
    对象透镜和光学头，用于从不同厚度的基板的光盘再现数据

    公开(公告)号：US5889748A

    公开(公告)日：1999-03-30

    申请号：US772874

    申请日：1996-12-26

    申请人： Takeshi Shimano ,  Masayuki Inoue ,  Akira Arimoto ,  Hiroyuki Minemura ,  Hisao Fujita ,  Hideaki Koyanagi

    发明人： Takeshi Shimano ,  Masayuki Inoue ,  Akira Arimoto ,  Hiroyuki Minemura ,  Hisao Fujita ,  Hideaki Koyanagi

    IPC分类号： G02B13/00 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135

    CPC分类号： G11B7/1381 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/139 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： The objective lens has a numerical aperture NA=0.6 when reproducing a DVD having a thickness of 0.6 mm and NA=0.42 when reproducing a CD having a thickness of 1.2 mm. At a boundary of NA 0.42, a slight stepped portion is formed so as to establish a phase difference. In this case, a designed wavelength is 0.635 .mu.m, and an optimum designed substrate thickness of a central portion is approximately 0.8 mm. While the DVD is reproduced, wave front aberration is on the order of 0.025.lambda., and jitter contained in the reproduction signal of the CD is equivalent to the present jitter. As a consequence, such an objective lens and an optical head with employment of this objective lens are provided, which precisely reproduce signals from the CD having the substrate thickness of 1.2 mm, and the DVD having the substrate thickness of 0.6 mm.

    摘要翻译： 当再现厚度为1.2mm的CD时，物镜在再现厚度为0.6mm的DVD和NA = 0.42时具有数值孔径NA = 0.6。 在NA 0.42的边界处，形成一个微小的台阶部分以形成相位差。 在这种情况下，设计波长为0.635μm，中心部分的最佳设计基板厚度为约0.8mm。 当DVD被再现时，波前像差在0.025λ的数量级，并且包含在CD的再现信号中的抖动等于当前的抖动。 因此，提供这样的物镜和使用这种物镜的光学头，其精确地再现了具有1.2mm的衬底厚度的CD的信号，以及具有0.6mm的衬底厚度的DVD。

    Optical disc drive
    10.
    发明授权
    Optical disc drive 有权
    光盘驱动器

    公开(公告)号：US06477129B2

    公开(公告)日：2002-11-05

    申请号：US09794913

    申请日：2001-02-28

    申请人： Koichi Maruyama ,  Takeshi Shimano ,  Shigeru Nakamura ,  Akira Arimoto ,  Kazuo Shigematsu

    发明人： Koichi Maruyama ,  Takeshi Shimano ,  Shigeru Nakamura ,  Akira Arimoto ,  Kazuo Shigematsu

    IPC分类号： G11B700

    CPC分类号： G11B7/1374 ,  G11B7/0901 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/12 ,  G11B7/123 ,  G11B7/127 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/139 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： An optical disc drive using either one of a first disc (e.g., DVD) and a second disc (e.g., CD), is provided with a first laser diode that emits a shorter wavelength beam, a second laser diode that emits a longer wavelength beam, an objective lens, and a driving unit that holds and rotates the optical disc. The optical axis of the objective lens is inclined relative to a normal to the optical disc. The first laser diode is located at a first position so that the coma, which is caused when the first laser beam is converged on a data recording surface of the first disc, is minimized, and the second laser diode is located at a second position so that the coma, which is caused when the second laser beam is converged on a data recording surface of the second disc, is minimized.

    摘要翻译： 使用第一盘（例如DVD）和第二盘（例如CD）中的任一个的光盘驱动器设置有发射较短波长束的第一激光二极管，发射较长波长束的第二激光二极管 ，物镜，以及保持和旋转光盘的驱动单元。 物镜的光轴相对于光盘的法线倾斜。 第一激光二极管位于第一位置，使得当第一激光束会聚在第一盘的数据记录表面上时引起的彗差被最小化，并且第二激光二极管位于第二位置 当第二激光束会聚在第二盘的数据记录表面上时引起的彗差被最小化。