公开(公告)号：US06208596B1

公开(公告)日：2001-03-27

申请号：US09220573

申请日：1998-12-23

申请人： Satoshi Imai ,  Yoshito Asoma

发明人： Satoshi Imai ,  Yoshito Asoma

IPC分类号： G11B7095

CPC分类号： G11B7/1356 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical pickup and an optical disk unit based on the optical pickup, which are capable of reducing their sizes, and of providing a low-cost construction, and further, of allowing accurate servo. The optical pickup comprises an optical separating section which is, in its optical source side surface, equipped with a first diffraction grating and an optical path branching section composed of a plurality of surfaces having normal vectors different from each other, and which is, in its optical disk side surface, equipped with a second diffraction grating composed of a continuous area. The first diffraction grating divides light from a light source into main and side beams, while the second diffraction grating allows the light from the light source to pass and diffracts the returning light from an optical disk toward the optical path branching section. The optical path branching section divides the returning light from the optical disk to lead the divisions to light-receiving sections of an optical detector.

摘要翻译： 基于光学拾取器的光拾取器和光盘单元，其能够减小其尺寸，并提供低成本的结构，并且还允许精确的伺服。 光学拾取器包括光学分离部分，其光源侧表面上装备有第一衍射光栅和由具有彼此不同的法向量的多个表面组成的光路分支部分，并且在其中 光盘侧表面，配备有由连续区域组成的第二衍射光栅。 第一衍射光栅将来自光源的光分成主光束和侧光束，而第二衍射光栅允许来自光源的光通过并将来自光盘的返回光衍射到光路分支部。 光路分支部分将来自光盘的返回光分开，以将分割线引导到光学检测器的光接收部分。

公开(公告)号：US08102749B2

公开(公告)日：2012-01-24

申请号：US12961914

申请日：2010-12-07

申请人： Kazumasa Kaneda ,  Yoshito Asoma ,  Toshifumi Yasui ,  Kazuyuki Takahashi

发明人： Kazumasa Kaneda ,  Yoshito Asoma ,  Toshifumi Yasui ,  Kazuyuki Takahashi

IPC分类号： G11B7/00

CPC分类号： G11B7/1275 ,  G11B7/1353 ,  G11B7/1374 ,  G11B2007/0006

摘要： An optical pickup includes: a first emitting unit to emit an optical beam of a first wavelength; a second emitting unit to emit an optical beam of a second wavelength; a third emitting unit to emit an optical beam of a third wavelength; an object lens to condense optical beams emitted from the first through third emitting units onto a signal recording face of an optical disc; and a diffraction unit provided on one face of an optical element or the object lens positioned on the optical path of the optical beams of the first through third wavelengths; wherein the diffraction unit includes a generally circular first diffraction region provided on the innermost perimeter, a ring zone shaped second diffraction region provided on the outer side of the first diffraction region, and a ring zone shaped third diffraction region provided on the outer side of the second diffraction region.

摘要翻译： 光拾取器包括：发射第一波长的光束的第一发射单元; 第二发光单元，发射第二波长的光束; 第三发光单元，发射第三波长的光束; 用于将从第一至第三发射单元发射的光束冷凝到光盘的信号记录面上的物镜; 以及设置在位于所述第一至第三波长的光束的光路上的光学元件或所述物镜的一个面上的衍射单元; 其特征在于，所述衍射单元包括设置在所述最内周边的大致圆形的第一衍射区域，设置在所述第一衍射区域的外侧的环形带状的第二衍射区域和设置在所述第一衍射区域的外侧的环形带状的第三衍射区域 第二衍射区域。

公开(公告)号：US07924684B2

公开(公告)日：2011-04-12

申请号：US12142351

申请日：2008-06-19

申请人： Kazumasa Kaneda ,  Yoshito Asoma ,  Toshifumi Yasui ,  Kazuyuki Takahashi

发明人： Kazumasa Kaneda ,  Yoshito Asoma ,  Toshifumi Yasui ,  Kazuyuki Takahashi

IPC分类号： G11B7/00

CPC分类号： G11B7/1275 ,  G11B7/1353 ,  G11B7/1374 ,  G11B2007/0006

摘要： An optical pickup includes: a first emitting unit to emit an optical beam of a first wavelength; a second emitting unit to emit an optical beam of a second wavelength; a third emitting unit to emit an optical beam of a third wavelength; an object lens to condense optical beams emitted from the first through third emitting units onto a signal recording face of an optical disc; and a diffraction unit provided on one face of an optical element or the object lens positioned on the optical path of the optical beams of the first through third wavelengths; wherein the diffraction unit includes a generally circular first diffraction region provided on the innermost perimeter, a ring zone shaped second diffraction region provided on the outer side of the first diffraction region, and a ring zone shaped third diffraction region provided on the outer side of the second diffraction region.

摘要翻译： 光拾取器包括：发射第一波长的光束的第一发射单元; 第二发光单元，发射第二波长的光束; 第三发光单元，发射第三波长的光束; 用于将从第一至第三发射单元发射的光束冷凝到光盘的信号记录面上的物镜; 以及设置在位于所述第一至第三波长的光束的光路上的光学元件或所述物镜的一个面上的衍射单元; 其特征在于，所述衍射单元包括设置在所述最内周边的大致圆形的第一衍射区域，设置在所述第一衍射区域的外侧的环形带状的第二衍射区域和设置在所述第一衍射区域的外侧的环形带状的第三衍射区域 第二衍射区域。

公开(公告)号：US06459672B1

公开(公告)日：2002-10-01

申请号：US09669657

申请日：2000-09-26

申请人： Yoshito Asoma

发明人： Yoshito Asoma

IPC分类号： G11B700

CPC分类号： G11B7/1275 ,  G11B7/08 ,  G11B7/0909 ,  G11B7/123 ,  G11B7/131 ,  G11B7/22 ,  G11B2007/0006

摘要： An optical head includes a (1) light radiating unit in which the relative positions of first and second light sources are set so that a straight line interconnecting a spot position of the laser light illuminated on an optical disc and a spot position of the second laser light similarly illuminated on the optical disc will be 45±15° with respect to a recording track on the optical disc and (2) a light receiving element having plural light receiving sections arranged substantially parallel to a splitting line substantially parallel to the straight line which interconnects the spot position of the laser light illuminated on an optical disc and the spot position of the second laser light similarly illuminated on the optical disc and which is projected on the optical disc. Each of the light receiving sections is split into four portions by a splitting line substantially parallel to the recording track on a signal recording surface of the optical disc and by a splitting line substantially perpendicular to it. With this configuration, focusing error signals can be properly detected by the astigmatic method in an optical head adapted for coping with plural optical heads of different kinds, while the head can be reduced in size.

摘要翻译： 光头包括：（1）发光单元，其中设置第一和第二光源的相对位置，使得将在光盘上照射的激光的光点位置和第二激光的光点位置相互连接的直线 类似于光盘上照明的光将相对于光盘上的记录轨道为45±15°，（2）具有基本平行于基本平行于直线的分割线布置的多个光接收部分的光接收元件， 将照射在光盘上的激光的光点位置和类似地照射在光盘上并投影在光盘上的第二激光的光点位置相互连接。 每个光接收部分通过基本上平行于光盘的信号记录表面上的记录轨道的分割线和基本上垂直于其的分割线分成四部分。 利用这种配置，可以通过适合于处理不同种类的多个光学头的光学头中的散光方法适当地检测聚焦误差信号，同时可以减小头部的尺寸。

公开(公告)号：US08738320B2

公开(公告)日：2014-05-27

申请号：US12917006

申请日：2010-11-01

申请人： Kazumasa Kaneda ,  Yoshito Asoma

发明人： Kazumasa Kaneda ,  Yoshito Asoma

IPC分类号： G01B11/14 ,  G02B27/12 ,  G01C3/08 ,  G01S7/481 ,  G01S17/10 ,  G01S17/42

CPC分类号： G01S7/4811 ,  F21V13/04 ,  F21V13/06 ,  G01S7/4817 ,  G01S17/10 ,  G01S17/42 ,  G02B3/02 ,  G02B27/123

摘要： A light condensing lens includes a plurality of lenses disposed side by side in a splitting direction of a view angle to condense incident light over a range corresponding to respective split portions of the view angle. The view angle is split in a direction orthogonal to an optical axis of the incident light.

摘要翻译： 聚光透镜包括在视角的分割方向上并排设置的多个透镜，以在对应于视角的相应分割部分的范围上聚集入射光。 视角在与入射光的光轴正交的方向上分割。

公开(公告)号：US06529454B1

公开(公告)日：2003-03-04

申请号：US09508169

申请日：2000-03-08

申请人： Yoshito Asoma ,  Kiyoshi Toyota ,  Noriaki Nishi

发明人： Yoshito Asoma ,  Kiyoshi Toyota ,  Noriaki Nishi

IPC分类号： G11B700

CPC分类号： G11B7/1356 ,  G11B7/00 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1378

摘要： A cylindrical lens 39 for generating focussing error signals is formed as one with a portion of an optical component 33 of a transparent material lying on an optical path L2 that is an optical path of a return light beam from the optical member 33. This configuration assures a small size while reducing the production cost and improving operational reliability.

摘要翻译： 用于产生聚焦误差信号的柱面透镜39形成为具有位于作为来自光学构件33的返回光束的光路的光路L2上的透明材料的光学部件33的一部分的柱面透镜39.这种构造确保 体积小，同时降低生产成本，提高运行可靠性。

公开(公告)号：US5461224A

公开(公告)日：1995-10-24

申请号：US177913

申请日：1994-01-06

申请人： Yoshito Asoma ,  Yoshiyuki Matsumoto

发明人： Yoshito Asoma ,  Yoshiyuki Matsumoto

IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10576 ,  G11B11/10543 ,  G11B7/123 ,  G11B7/13

摘要： In an optical pick-up device, a first photodetector is disposed in such a position as to detect a light beam which is part of a light beam reflected from an optical disk and split in a direction different from a light source direction, and a second photodetector is disposed in the vicinity of the light source so that it can detect a light beam which is the other part of the light beam reflected from the optical disk and split in the light source direction, wherein a tracking control signal and a reproducing signal are detected by the first photodetector and a focusing control signal is detected by the second photodetector.

摘要翻译： 在光学拾取装置中，第一光电检测器设置在检测作为从光盘反射并沿与光源方向不同的方向分裂的光束的一部分的光束的位置，第二光电检测器 光电检测器设置在光源附近，使得其可以检测作为从光盘反射并在光源方向上分离的光束的另一部分的光束，其中跟踪控制信号和再现信号是 由第一光电检测器检测，并且由第二光电检测器检测聚焦控制信号。

公开(公告)号：US5428596A

公开(公告)日：1995-06-27

申请号：US264621

申请日：1994-06-23

申请人： Satoshi Hineno ,  Yoshito Asoma ,  Nobuhiko Ando

发明人： Satoshi Hineno ,  Yoshito Asoma ,  Nobuhiko Ando

IPC分类号： G11B7/135 ,  G11B11/10 ,  G11B11/105 ,  G11B7/095

CPC分类号： G11B7/1356 ,  G11B11/10532

摘要： An optical pickup apparatus for recording information signals on an optical recording medium. The apparatus includes a light source radiating a diverging light flux, an object lens on which a light flux radiated from said light source is incident, for converging the light flux on the optical recording medium, a light flux dividing device arranged at a position on a light path between the light source and the object lens at which the light flux remains a diverging light flux, which light flux dividing device divests reflected light flux from the optical recording medium out of the light path, a light detection unit for detecting the reflected light diverted from the light path by the light flux dividing device, and a polarized light dependent light flux separating device arranged at a position on a light path between the light flux dividing device and the light detection device at which the reflected light flux is a converging light flux. In this manner, recording characteristics of information signals may be improved and a simplified structure and a small size of the apparatus may be realized.

摘要翻译： 一种用于在光学记录介质上记录信息信号的光学拾取装置。 该装置包括：辐射发散光束的光源;从所述光源辐射的光束入射的物镜，用于将光通量会聚在光记录介质上;光束分配装置，其布置在 在光源和物镜之间的光路中，光束保持发散光束，该光束分配装置将光记录介质的反射光束从光路中分离出来;光检测单元，用于检测反射光 通过光束分配装置从光路分支的偏振光依赖性光束分离装置，配置在光束分离装置与光检测装置之间的光路上的位置处的反射光束为会聚光的偏振光相关光束分离装置 助焊剂 以这种方式，可以改善信息信号的记录特性，并且可以实现装置的简化结构和小尺寸。

公开(公告)号：US20110112795A1

公开(公告)日：2011-05-12

申请号：US12917006

申请日：2010-11-01

申请人： Kazumasa Kaneda ,  Yoshito Asoma

发明人： Kazumasa Kaneda ,  Yoshito Asoma

IPC分类号： G01B11/14 ,  G02B27/12 ,  G01C3/08

CPC分类号： G01S7/4811 ,  F21V13/04 ,  F21V13/06 ,  G01S7/4817 ,  G01S17/10 ,  G01S17/42 ,  G02B3/02 ,  G02B27/123

摘要： A light condensing lens includes a plurality of lenses disposed side by side in a splitting direction of a view angle to condense incident light over a range corresponding to respective split portions of the view angle. The view angle is split in a direction orthogonal to an optical axis of the incident light.

摘要翻译： 聚光透镜包括在视角的分割方向上并排设置的多个透镜，以在对应于视角的相应分割部分的范围上聚集入射光。 视角在与入射光的光轴正交的方向上分割。

公开(公告)号：US20070177480A1

公开(公告)日：2007-08-02

申请号：US10590960

申请日：2005-03-03

申请人： Yoshito Asoma

发明人： Yoshito Asoma

IPC分类号： G11B7/00

CPC分类号： G11B7/1398 ,  G11B7/1353 ,  G11B7/13922 ,  G11B2007/0006

摘要： A plurality of light-emitting elements 9a, 9b, 10a each emitting laser beam of a wavelength of approximately 405 nm, approximately 660 nm or approximately 780 nm corresponded to each of a plurality of types of disc-formed medium 100, and an objective lens 18 condensing each laser beam emitted from the plurality of light-emitting elements so as to form an elliptic beam spot on a recording surface of the disc-formed recording medium are provided, wherein a long axis of a beam spot of the laser beam having a wavelength of approximately 660 nm is aligned in a direction 45° to 65° away from the tangential direction of the disc-formed recording medium, and a long axis of a beam spot of the laser beam having a wavelength of approximately 405 nm is aligned in a direction 25° to 45° away from the tangential direction of the disc-formed recording medium. With this configuration, it is made possible to improve performance of reading information signals with respect to different types of disc-formed recording media without increasing the cost.

摘要翻译： 发射波长约405nm，约660nm或约780nm的激光束的多个发光元件9a，9b，10a对应于多种类型的盘形介质100中的每一种，物镜 18，将从多个发光元件发射的各激光束聚光以在盘状记录介质的记录表面上形成椭圆形光束斑点，其中激光束的光束点的长轴具有 大约660nm的波长在与盘形记录介质的切线方向成45°至65°的方向上对准，并且具有约405nm波长的激光束的光束点的长轴对齐 与盘形记录介质的切线方向成25°至45°的方向。 利用这种配置，可以提高对不同类型的盘形记录介质读取信息信号的性能，而不增加成本。