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    Focus detection device for reading information from an optical recording medium
    1.
    发明授权
    Focus detection device for reading information from an optical recording medium 失效
    用于从光学记录介质读取信息的对焦检测装置

    公开(公告)号：US5345072A

    公开(公告)日：1994-09-06

    申请号：US997293

    申请日：1992-12-23

    申请人： Hideki Hayashi ,  Shinichi Tanaka ,  Sadao Mizuno ,  Noboru Ito ,  Yoshiaki Komma

    发明人： Hideki Hayashi ,  Shinichi Tanaka ,  Sadao Mizuno ,  Noboru Ito ,  Yoshiaki Komma

    IPC分类号： G11B7/09 ,  G11B7/135 ,  G01J1/20 ,  G11B7/00

    CPC分类号： G11B7/1353 ,  G11B7/0912

    摘要： A focus detection device for use in a focus detection device includes a main light source and two auxiliary light sources. These auxiliary light sources are offset to the main light source along the optical axis of the main optical system while being symmetrically positioned perpendicular to the optical axis. A exposure units having apertures are provided above the two auxiliary light sources for constricting the amount of auxiliary lights so that the convergence of the auxiliary beams on the optical disk is less than that of the main light beam. As a result, an optical system with a broad focus error detection range can be constructed while increasing the convergence of the main light beam.

    摘要翻译： 用于焦点检测装置的焦点检测装置包括主光源和两个辅助光源。 这些辅助光源沿着主光学系统的光轴偏移到主光源，同时垂直于光轴对称定位。 具有孔径的曝光单元设置在两个辅助光源上方，用于限制辅助光的量，使得辅助光束在光盘上的会聚小于主光束的会聚。 结果，可以在增加主光束的会聚的同时构造具有宽聚焦误差检测范围的光学系统。

    Optical head for reproducing data from first and second optical disks
    2.
    发明授权
    Optical head for reproducing data from first and second optical disks 失效
    用于从第一和第二光盘再现数据的光学头

    公开(公告)号：US5912868A

    公开(公告)日：1999-06-15

    申请号：US918295

    申请日：1997-08-25

    申请人： Hideki Hayashi ,  Sadao Mizuno ,  Noboru Ito ,  Kenichiro Urairi ,  Yoshiaki Komma

    发明人： Hideki Hayashi ,  Sadao Mizuno ,  Noboru Ito ,  Kenichiro Urairi ,  Yoshiaki Komma

    IPC分类号： G11B7/14 ,  G11B7/00 ,  G11B7/12 ,  G11B7/125 ,  G11B7/135

    CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/127 ,  G11B7/1356 ,  G11B7/1381 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： An optical head for reproducing data from first and second optical disks which are different from each other in at least one of a base material thickness and an available wavelength, includes: a first light source for emitting a first light beam, the first light beam being used for reproducing data from the first optical disk: an optical system designed to converge the first light beam onto the first optical disk in accordance with a base material thickness and an available wavelength of the first optical disk: and a second light source for emitting a second light beam, the second light beam being used for reproducing data from the second optical disk, wherein an optical path length between the second light source and the optical system is different from an optical path length between the first light source and the optical system, and wherein the optical system converges the second light beam onto the second optical disk.

    摘要翻译： 一种用于从基材厚度和可用波长中的至少一个中彼此不同的第一和第二光盘再现数据的光学头包括：用于发射第一光束的第一光源，第一光束是 用于从第一光盘再现数据：被设计为根据第一光盘的基材厚度和可用波长将第一光束会聚到第一光盘上的光学系统，以及用于发射第一光盘的第二光源 第二光束，第二光束用于从第二光盘再现数据，其中第二光源和光学系统之间的光路长度不同于第一光源和光学系统之间的光程长度， 并且其中所述光学系统将所述第二光束会聚到所述第二光盘上。

    Optical head and optical data recording and reproducing apparatus having the same
    3.
    发明授权
    Optical head and optical data recording and reproducing apparatus having the same 失效
    具有该光头和光数据记录和再现装置的光头和光数据记录和重放装置

    公开(公告)号：US5703856A

    公开(公告)日：1997-12-30

    申请号：US324262

    申请日：1994-10-17

    申请人： Hideki Hayashi ,  Sadao Mizuno ,  Noboru Ito ,  Kenichiro Urairi ,  Yoshiaki Komma

    发明人： Hideki Hayashi ,  Sadao Mizuno ,  Noboru Ito ,  Kenichiro Urairi ,  Yoshiaki Komma

    IPC分类号： G11B7/14 ,  G11B7/00 ,  G11B7/12 ,  G11B7/125 ,  G11B7/135

    CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/127 ,  G11B7/1356 ,  G11B7/1381 ,  G11B7/13922 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： An optical head for reproducing data from first and second optical disks which are different from each other in at least one of a base material thickness and an available wavelength, includes: a first light source for emitting a first light beam, the first light beam being used for reproducing data from the first optical disk: an optical system designed to converge the first light beam onto the first optical disk in accordance with a base material thickness and an available wavelength of the first optical disk: and a second light source for emitting a second light beam, the second light beam being used for reproducing data from the second optical disk, wherein an optical path length between the second light source and the optical system is different from an optical path length between the first light source and the optical system, and wherein the optical system converges the second light beam onto the second optical disk.

    摘要翻译： 一种用于从基材厚度和可用波长中的至少一个中彼此不同的第一和第二光盘再现数据的光学头包括：用于发射第一光束的第一光源，第一光束是 用于从第一光盘再现数据：被设计为根据第一光盘的基材厚度和可用波长将第一光束会聚到第一光盘上的光学系统，以及用于发射第一光盘的第二光源 第二光束，第二光束用于从第二光盘再现数据，其中第二光源和光学系统之间的光路长度不同于第一光源和光学系统之间的光程长度， 并且其中所述光学系统将所述第二光束会聚到所述第二光盘上。

    Optical head and optical information apparatus for recording or reproducing information on an information recording medium
    7.
    发明授权
    Optical head and optical information apparatus for recording or reproducing information on an information recording medium 有权
    用于在信息记录介质上记录或再现信息的光头和光信息装置

    公开(公告)号：US07486606B2

    公开(公告)日：2009-02-03

    申请号：US11151272

    申请日：2005-06-14

    申请人： Kousei Sano ,  Yoshiaki Komma ,  Sadao Mizuno

    发明人： Kousei Sano ,  Yoshiaki Komma ,  Sadao Mizuno

    IPC分类号： G11B7/00

    CPC分类号： G11B7/1353

    摘要： An optical head which is capable of realizing a stable tracking control, even if the rotational center of an information recording medium is not located on the extension line of the transfer directions of a light-concentrating element, includes: a semiconductor laser which emits a beam of light; an objective lens which concentrates the beam of light on an optical disk; a transfer mechanism which transfers the objective lens between the outermost circumference and the innermost circumference of the recording area of the optical disk along the optical disk; and a photo-detector which detects a beam of light that returns from the optical disk. The photo-detector includes a plurality of areas which are divided by a division line. The division line is set parallel to the tangential directions of the track in a predetermined position on the transfer line of the objective lens between the outermost circumference and the innermost circumference of the recording area, and the plurality of areas are divided, by a lateral division line which intersects the division line, into a first area on which a beam of light that mainly includes a tracking component is incident and a second area on which a beam of light that does not include the tracking component is incident.

    摘要翻译： 即使信息记录介质的旋转中心不位于聚光元件的传送方向的延长线上，也能够实现稳定的跟踪控制的光学头包括：发射光束的半导体激光器 的光 将光束聚集在光盘上的物镜; 传送机构，其沿着光盘在光盘的记录区域的最外圆周和最内圆周之间传送物镜; 以及光检测器，其检测从光盘返回的光束。 光检测器包括由划分线划分的多个区域。 分割线与记录区域的最外圆周和最内圆周之间的物镜的传送线上的预定位置处的轨道的切线方向平行设置，并且通过横向划分来划分多个区域 与分割线相交的第一区域进入主要包括跟踪分量的光束入射的第一区域和不包括跟踪组件的光束入射的第二区域。

    Optical head device and optical information apparatus using the same
    8.
    发明授权
    Optical head device and optical information apparatus using the same 有权
    光头装置及其使用的光信息装置

    公开(公告)号：US07330419B2

    公开(公告)日：2008-02-12

    申请号：US11443751

    申请日：2006-05-31

    申请人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

    发明人： Seiji Nishino ,  Hidenori Wada ,  Yoshiaki Komma ,  Sadao Mizuno ,  Keiichi Matsuzaki

    IPC分类号： G11B7/00

    CPC分类号： G11B7/1398 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1372 ,  G11B7/1378 ,  G11B7/13922 ,  G11B7/13925

    摘要： An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source on an optical information medium with an objective lens. A chromatic aberration correction element for correcting chromatic aberration occurring in the objective lens is provided between the semiconductor laser light source and the optical information medium. A light distribution correction element in which the transmittance increases with the distance from the center of the aperture surface of the objective lens is provided so as to correct a reduction of the intensity of the light incident on the aperture surface of the objective lens with the distance from the center of the aperture surface.

    摘要翻译： 光头装置包括聚焦光学系统，用于将从半导体激光光源发射的激光束聚焦在具有物镜的光信息介质上。 在半导体激光光源和光信息介质之间设置用于校正物镜中出现的色像差的色像差校正元件。 提供透光率随着距离物镜的孔径表面的中心的距离而增加的光分布校正元件，以便校正入射到物镜的孔表面上的光的强度的降低，距离 从孔表面的中心。