公开(公告)号：US5923636A

公开(公告)日：1999-07-13

申请号：US878183

申请日：1997-06-18

申请人： Takashi Haruguchi ,  Kouki Kojima ,  Kazuyuki Nakashima ,  Fuminobu Furukawa

发明人： Takashi Haruguchi ,  Kouki Kojima ,  Kazuyuki Nakashima ,  Fuminobu Furukawa

IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135 ,  G11B7/12

CPC分类号： G11B7/1362 ,  G11B7/123 ,  G11B7/1275 ,  G11B7/1353 ,  G11B7/1365 ,  G11B7/1374 ,  G11B7/139 ,  G11B2007/0006

摘要： An optical pickup for recording on and reproduction from recording media of different recording densities (e.g. a high density disk such as a DVD and a lower density disk such as an ordinary CD), and having a compact, thin and low power-consumption design. The optical pickup includes an objective lens, a first optical unit having a light-emitting element and a light-receiving element which are used for recording on and reproduction from the high-density optical disk, a second optical unit having a light-emitting element and a light-receiving element which are used for recording on and reproduction from the low-density optical disk, a beam splitter for guiding optical axes of the first and second optical units to the same optical axis, and a wavelength filter for changing a diameter of light beams incident on the objective lens between at the time of recording and reproduction for the high-density optical disk and at the time of recording and reproduction for the low-density optical disk.

摘要翻译： 用于在不同记录密度的记录介质（例如，诸如DVD的高密度盘和诸如普通CD的低密度盘）之间进行记录和再现的光学拾取器，并具有紧凑，薄且低功耗设计。 光拾取器包括物镜，具有发光元件的第一光学单元和用于在高密度光盘上进行记录和再现的光接收元件，第二光学单元具有发光元件 以及用于从低密度光盘记录和再生的光接收元件，用于将第一和第二光学单元的光轴引导到同一光轴的分束器和用于改变直径的波长滤光器 在高密度光盘的记录和再现时以及低密度光盘的记录和再现时入射在物镜上的光束。

公开(公告)号：US6084847A

公开(公告)日：2000-07-04

申请号：US382201

申请日：1999-08-23

申请人： Kouki Kojima ,  Fuminobu Furukawa

发明人： Kouki Kojima ,  Fuminobu Furukawa

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

CPC分类号： G11B7/1275 ,  G11B7/12 ,  G11B7/1374 ,  G11B2007/0006

摘要： An optical pickup capable of recording or reproducing information from optical disks having different recording densities includes a first optical unit having a light source which emits rays having a first wavelength for DVDs and a first light sensor which detects reflected rays, a second optical unit having a light source which emits rays having a second wavelength for CDs and a second light sensor which detects reflected rays, a beam splitter which directs the rays having the first wavelength and the rays having the second wavelength along substantially the same optical axis, and directs reflected rays from an optical disk to the first light sensor and the second light sensor, and an objective lens which has a numerical aperture (NA) of 0.6 or more, a focal length of 2.5 mm or less, an effective diameter of incidence of 3.0 mm or less and a working distance of 1.2 mm or less. The light pickup as a whole has a thickness of 7.5 mm or less as measured from a bottom surface of the optical disk. The light pickup is capable of reproducing information from optical disks having different recording densities, is composed of a small number of parts, and is compact and thin.

摘要翻译： 能够从具有不同记录密度的光盘记录或再现信息的光学拾取器包括具有发射用于DVD的第一波长的光的光源和检测反射光线的第一光传感器的第一光学单元，具有 发射用于CD的第二波长的光的光源和检测反射光线的第二光传感器;将具有第一波长的光和基本上相同的光轴的第二波长的光引导的分束器，并且引导反射光线 从光盘到第一光传感器和第二光传感器，以及物镜，其数值孔径（NA）为0.6以上，焦距为2.5mm以下，有效入射直径为3.0mm， 较小，工作距离为1.2mm以下。 光拾取器整体上从光盘的底面测得的厚度为7.5mm以下。 光拾取器能够从具有不同记录密度的光盘再现信息，由少量部件组成，并且紧凑而薄。

公开(公告)号：US5986994A

公开(公告)日：1999-11-16

申请号：US989897

申请日：1997-12-12

申请人： Kouki Kojima ,  Fuminobu Furukawa

发明人： Kouki Kojima ,  Fuminobu Furukawa

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

CPC分类号： G11B7/1275 ,  G11B7/12 ,  G11B7/1374 ,  G11B2007/0006

摘要： An optical pickup is disclosed which is capable of recording or reproducing information from optical disks having different recording densities and includes a first optical unit having a light source which emits rays having a first wavelength for DVDs and a first light sensor which detects reflected rays, a second optical unit having a light source which emits rays having a second wavelength for CDs and a second light sensor which detects reflected rays, a beam splitter which directs the rays having the first wavelength and the rays having the second wavelength along substantially the same optical axis, and directs reflected rays from an optical disk to the first light sensor and the second light sensor, and an objective lens which has a numerical aperture (NA) of 0.6 or more, a focal length of 2.5 mm or less, an effective diameter of incidence of 3.0 mm or less and a working distance of 1.2 mm or less. The light pickup as a whole has a thickness of 7.5 mm or less as measured from a bottom surface of the optical disk. The light pickup is capable of reproducing information from optical disks having different recording densities, is composed of a small number of parts, and is compact and thin.

摘要翻译： 公开了一种光拾取器，其能够从具有不同记录密度的光盘记录或再现信息，并且包括具有发射用于DVD的第一波长的光的光源和检测反射光线的第一光传感器的第一光学单元， 第二光学单元，其具有发射用于CD的第二波长的光的光源和检测反射光线的第二光传感器;分束器，其将具有第一波长的光和具有第二波长的光沿着基本上相同的光轴 并且将来自光盘的反射光线引导到第一光传感器和第二光传感器，以及数值孔径（NA）为0.6以上，焦距为2.5mm以下的物镜，有效直径 发生率为3.0mm以下，工作距离为1.2mm以下。 光拾取器整体上从光盘的底面测得的厚度为7.5mm以下。 光拾取器能够从具有不同记录密度的光盘再现信息，由少量部件组成，并且紧凑而薄。

公开(公告)号：US5422870A

公开(公告)日：1995-06-06

申请号：US18573

申请日：1993-02-17

申请人： Kouki Kojima ,  Syougo Horinouchi

发明人： Kouki Kojima ,  Syougo Horinouchi

IPC分类号： G11B7/12 ,  G11B7/135 ,  G11B7/095

CPC分类号： G11B7/1362 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/1359

摘要： An optical pickup for use in optically recording or picking up information on and from a recording medium using a light-emitting device. The optical pickup comprises first and second light reflecting surfaces disposed in opposed relation to each other, the first reflecting surface reflects a light beam from the light-emitting device and the second reflecting surface reflects the light beam reflected from the first reflecting surface. Around the first reflecting surface there is provide a grating lens which condenses the light beam reflected from the second reflecting surface to be focused on the recording medium. The light beam from the recording medium is reflected by the second reflecting surface to be directed to the first reflecting surface. The first reflecting surface diffracts the reflected light beam from the second reflecting surface toward a light receiving device to read the information concurrently detecting focusing and tracking error signals. This arrangement can achieve the size-reduction of the optical pickup.

摘要翻译： 一种光学拾取器，用于使用发光装置在记录介质上光学记录或拾取信息。 光拾取器包括彼此相对设置的第一和第二光反射表面，第一反射表面反射来自发光器件的光束，第二反射表面反射从第一反射表面反射的光束。 围绕第一反射表面提供了将从第二反射表面反射的光束聚焦在记录介质上的光栅透镜。 来自记录介质的光束被第二反射表面反射以被引导到第一反射表面。 第一反射表面将来自第二反射表面的反射光束衍射到光接收装置，以读取同时检测聚焦和跟踪误差信号的信息。 这种布置可以实现光学拾取器的尺寸减小。

公开(公告)号：US5621716A

公开(公告)日：1997-04-15

申请号：US429278

申请日：1995-04-25

申请人： Kouki Kojima ,  Syougo Horinouchi

发明人： Kouki Kojima ,  Syougo Horinouchi

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

CPC分类号： G11B7/1362 ,  G11B7/123 ,  G11B7/1353 ,  G11B7/1359

摘要： An optical pickup for use in optically recording or picking up information on and from a recording medium using a light-emitting device. The optical pickup comprises first and second light reflecting surfaces disposed in opposed relation to each other, the first reflecting surface reflects a light beam from the light-emitting device and the second reflecting surface reflects the light beam reflected from the first reflecting surface. Around the first reflecting surface there is provide a grating lens which condenses the light beam reflected from the second reflecting surface to be focused on the recording medium. The light beam from the recording medium is reflected by the second reflecting surface to be directed to the first reflecting surface. The first reflecting surface diffracts the reflected light beam from the second reflecting surface toward a light receiving device to read the information concurrently detecting focusing and tracking error signals. This arrangement can achieve the size-reduction of the optical pickup.

摘要翻译： 一种光学拾取器，用于使用发光装置在记录介质上光学记录或拾取信息。 光拾取器包括彼此相对设置的第一和第二光反射表面，第一反射表面反射来自发光器件的光束，第二反射表面反射从第一反射表面反射的光束。 围绕第一反射表面提供了将从第二反射表面反射的光束聚焦在记录介质上的光栅透镜。 来自记录介质的光束被第二反射表面反射以被引导到第一反射表面。 第一反射表面将来自第二反射表面的反射光束衍射到光接收装置，以读取同时检测聚焦和跟踪误差信号的信息。 这种布置可以实现光学拾取器的尺寸减小。

公开(公告)号：US06804186B2

公开(公告)日：2004-10-12

申请号：US09860583

申请日：2001-05-21

申请人： Kouki Kojima ,  Shogo Horinouchi

发明人： Kouki Kojima ,  Shogo Horinouchi

IPC分类号： G11B700

CPC分类号： G11B7/13925 ,  G11B7/0956 ,  G11B7/1369 ,  G11B2007/0006

摘要： An optical pick-up composed of an objective lens and a liquid crystal element, for recording and reproduction of optical discs having different recording densities, the liquid crystal element having nine zones, including: zones 2, 4 located in center parts of half circles of a small diameter beam for a low density optical disc, zones 3, 5 laid along the outer peripheries of zones 2, 4 within the half circles so as to surround zones 2, 4, zones 6, 7 along the outer peripheries of zones 3, 5, between the outer periphery of the small diameter beam and a large diameter beam, extending along substantially half circumferential parts of the small diameter beam, zones 8, 9 extending along substantially half circumferential parts of the large diameter beam, a remainder first zone and including a diameter whose the direction is the same as a tilt direction to be corrected.

摘要翻译： 一种由物镜和液晶元件组成的用于记录和再现具有不同记录密度的光盘的光学拾取器，该液晶元件具有九个区域，包括：位于半圆的中心部分的区域2,4 用于低密度光盘的小直径光束，沿着半圆内的区域2,4的外周放置的区域3,5，以沿着区域3的外周围绕区域2,4，区域6,7， 如图5所示，在小直径光束的外周边和大直径光束之间沿着小直径光束的大致半个圆周部分延伸，沿着大直径光束的大致半个圆周部分延伸的区域8,9，剩余的第一区域和 包括其方向与要校正的倾斜方向相同的直径。

公开(公告)号：US5566157A

公开(公告)日：1996-10-15

申请号：US514709

申请日：1995-08-14

申请人： Kouki Kojima ,  Syougo Horinouchi

发明人： Kouki Kojima ,  Syougo Horinouchi

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

CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/1359 ,  G11B7/1362

摘要： An optical pickup for use in optically recording or picking up information on and from a recording medium using a light-emitting device. The optical pickup comprises first and second light reflecting surfaces disposed in opposed relation to each other, the first reflecting surface reflects a light beam from the light-emitting device and the second reflecting surface reflects the light beam reflected from the first reflecting surface. Around the first reflecting surface there is provide a grating lens which condenses the light beam reflected from the second reflecting surface to be focused on the recording medium. The light beam from the recording medium is reflected by the second reflecting surface to be directed to the first reflecting surface. The first reflecting surface diffracts the reflected light beam from the second reflecting surface toward a light receiving device to read the information concurrently detecting focusing and tracking error signals. This arrangement can achieve the size-reduction of the optical pickup.

摘要翻译： 一种光学拾取器，用于使用发光装置在记录介质上光学记录或拾取信息。 光拾取器包括彼此相对设置的第一和第二光反射表面，第一反射表面反射来自发光器件的光束，并且第二反射表面反射从第一反射表面反射的光束。 围绕第一反射表面提供了将从第二反射表面反射的光束聚焦在记录介质上的光栅透镜。 来自记录介质的光束被第二反射表面反射以被引导到第一反射表面。 第一反射表面将来自第二反射表面的反射光束衍射到光接收装置，以读取同时检测聚焦和跟踪误差信号的信息。 这种布置可以实现光学拾取器的尺寸减小。

公开(公告)号：US5377177A

公开(公告)日：1994-12-27

申请号：US952224

申请日：1992-09-28

申请人： Syougo Horinouchi ,  Satoshi Kiyomatsu ,  Kouki Kojima

发明人： Syougo Horinouchi ,  Satoshi Kiyomatsu ,  Kouki Kojima

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

CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/1359 ,  G11B7/1362

摘要： An optical pickup to be used in an optical disc apparatus for optically recording and reproducing information on and from an optical disc. The optical pickup is arranged such that a laser light from a semiconductor laser is reflected plural times within an optical system and then focused on the optical disc and the light from the optical disc is diffracted by a hologram and then received by a light-receiving device for reproducing the information recorded on the optical disc. This arrangement can achieve the size-reduction of the optical pickup concurrently with obtaining a necessary optical path length.

摘要翻译： 一种光拾取器，用于在光盘上光学记录和再现信息的光盘装置。 光拾取器被布置成使得来自半导体激光器的激光在光学系统内被多次反射，然后聚焦在光盘上，并且来自光盘的光被全息图衍射，然后由光接收装置 用于再现记录在光盘上的信息。 这种布置可以在获得必要的光程长度的同时实现光学拾取器的尺寸减小。