公开(公告)号：US20120051204A1

公开(公告)日：2012-03-01

申请号：US13070960

申请日：2011-03-24

申请人： Kunikazu OHNISHI ,  Kazuyoshi YAMAZAKI ,  Mitsuru NAGASAWA

发明人： Kunikazu OHNISHI ,  Kazuyoshi YAMAZAKI ,  Mitsuru NAGASAWA

IPC分类号： G11B7/135

CPC分类号： G11B7/094 ,  G11B7/0912 ,  G11B7/1381

摘要： An optical pickup compatible with two wavelengths such as an optical pickup having a two-wavelength, multi-laser source unit to be compatible with both DVDs and CDs prevents, in a simply structured optical system, error signal quality deterioration caused by relative shifting between laser beams and realizes detection of focus and tracking error signals. The optical system is provided with an optical waveguide device and a photodetector. The optical waveguide device includes a holographic diffraction grating having three regions divided by two approximately parallel division lines which extend respectively passing the optical axes of a laser beam for DVD and a laser beam for CD. The photodetector has plural light receiving surfaces each divided into three regions. This allows reliable focus and tracking error signals to be detected during both DVD reproduction and CD reproduction.

摘要翻译： 与两个波长兼容的光学拾取器，例如具有与DVD和CD兼容的双波长多激光源单元的光学拾取器，在简单结构的光学系统中防止由激光器之间的相对移动引起的误差信号质量劣化 实现对焦和跟踪误差信号的检测。 光学系统设置有光波导装置和光电检测器。 光波导器件包括具有三个区域的三维区域的全息衍射光栅，该区域被分别延伸通过DVD的激光束的光轴和CD的激光束的两个近似平行的分割线分开。 光电检测器具有分成三个区域的多个光接收表面。 这允许在DVD再现和CD再现期间检测可靠的对焦和跟踪误差信号。

公开(公告)号：US20110211437A1

公开(公告)日：2011-09-01

申请号：US12955269

申请日：2010-11-29

申请人： Kazuyoshi YAMAZAKI ,  Tomoto Kawamura

发明人： Kazuyoshi YAMAZAKI ,  Tomoto Kawamura

IPC分类号： G11B7/135

CPC分类号： G11B7/1381 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0013

摘要： An optical pickup device including: a laser diode for emitting laser light; an objective lens which irradiates an optical beam emitted from the laser diode; an actuator which displaces the objective lens in a radius direction of the optical disc; a grating for branches an optical beam reflected by an information recording layer into plural regions; and one photodetector having plural light receiving parts for receiving the branched optical beams, wherein the photodetector has a first light receiving part which detects zero-th order grating diffracted light and plural second light receiving parts which detecting grating diffracted light having an order not less than that of ±first order grating diffracted light; a detected signal of the zero-th order grating diffracted light is defined as a reproduction signal; and a detected signal of the grating diffracted light is defined as a signal for servo controlling.

摘要翻译： 一种光学拾取装置，包括：用于发射激光的激光二极管; 用于照射从激光二极管发射的光束的物镜; 致动器，其在所述光盘的半径方向上移动所述物镜; 光栅，用于将由信息记录层反射的光束分支成多个区域; 以及一个光电检测器，具有用于接收分支光束的多个光接收部分，其中光电检测器具有检测零级光栅衍射光的第一光接收部分和多个第二受光部分，其检测具有不小于 ±一阶光栅衍射光; 将零级光栅衍射光的检测信号定义为再现信号; 光栅衍射光的检测信号被定义为用于伺服控制的信号。

公开(公告)号：US20090185463A1

公开(公告)日：2009-07-23

申请号：US12356801

申请日：2009-01-21

申请人： Kazuyoshi YAMAZAKI

发明人： Kazuyoshi YAMAZAKI

IPC分类号： G11B7/00

CPC分类号： G11B7/1381 ,  G11B7/0901 ,  G11B7/094 ,  G11B7/1353 ,  G11B2007/0006

摘要： A pickup device splits and detects a light beam reflected from a disc with the use of a grating. The grating has first to six areas, wherein the first area and the second area, the third area and the fifth area, and the fourth area and the sixth area are arranged in point symmetry with respect to the center of the grating, respectively. The first area is interposed between the fourth area and the fifth area and the second area is interposed between the third area and the sixth area. Further, the centers of the first area and the second area are arranged to be spaced by a distance d in a direction perpendicular to the displacement direction of the optical pickup device. Even though the center of an optical disc is not located on a straight line in the displacement direction of the optical pickup device, objective lens can obtain a stable servo signal.

摘要翻译： 拾取装置利用光栅分离和检测从盘反射的光束。 光栅具有第一至六个区域，其中第一区域和第二区域，第三区域和第五区域以及第四区域和第六区域分别相对于光栅的中心以点对称的方式布置。 第一区域介于第四区域和第五区域之间，第二区域介于第三区域和第六区域之间。 此外，第一区域和第二区域的中心布置成在垂直于光学拾取装置的位移方向的方向上间隔距离d。 即使光盘的中心位于光拾取装置的位移方向上的直线上，物镜也可以获得稳定的伺服信号。

公开(公告)号：US20130003517A1

公开(公告)日：2013-01-03

申请号：US13532816

申请日：2012-06-26

申请人： Kazuyoshi YAMAZAKI

发明人： Kazuyoshi YAMAZAKI

IPC分类号： G11B7/00

CPC分类号： G11B7/0903 ,  G11B7/1353 ,  G11B7/24038 ,  G11B7/2405

摘要： An optical pickup device and an optical disc apparatus including the optical pickup device are provided which can obtain a stable servo signal in the recording/reproduction of an information recording medium inexpensively fabricated with multiple information recording surfaces. The optical pickup device includes: a laser diode that emits a light beam; a grating that splits the light beam into at least a main beam, a first sub beam, and a second sub beam; and an objective lens that condenses the light beams and forms at least three spots on an optical disc, wherein the spot of the first sub beam and the spot of the second sub beam are located inside or outside the spot of the main beam on the optical disc, and a tracking error signal is generated from signals obtained by detecting the first sub beam and the second sub beam.

摘要翻译： 提供了一种包括光拾取装置的光拾取装置和光盘装置，其可以在以多个信息记录表面廉价制造的信息记录介质的记录/再现中获得稳定的伺服信号。 光拾取装置包括：发射光束的激光二极管; 将光束分成至少主光束，第一子光束和第二子光束的光栅; 以及物镜，其使所述光束会聚并在光盘上形成至少三个点，其中所述第一子光束的光斑和所述第二子光束的光点位于所述光束的所述主光束的光点的内部或外部 并且通过检测第一子光束和第二子光束获得的信号产生跟踪误差信号。

公开(公告)号：US20130016599A1

公开(公告)日：2013-01-17

申请号：US13548375

申请日：2012-07-13

申请人： Kazuyoshi YAMAZAKI

发明人： Kazuyoshi YAMAZAKI

IPC分类号： G11B7/135

CPC分类号： G11B7/0916 ,  G11B7/0901 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1381 ,  G11B2007/0013

摘要： Optical pickup device including: semiconductor laser diode emitting optical flux; objective lens converging flux emitted from the diode and radiating flux to an optical disc; diffraction grating branching an optical flux reflected from the disc; and a photodetector receiving flux branched by the grating and has a plurality of light receiving parts, wherein: the grating has areas A, B and C; among diffracted beams diffracted by a track of the optical disc, only a 0-th order diffracted beam becomes incident upon area A, and 0-th and ±1-st order diffracted beams become incident upon area B; the photodetector detects a reproduction signal from optical fluxes diffracted in areas A, B and C; the plurality of light receiving parts which detect the +1-st order diffracted beam or the −1-st diffracted beam diffracted in area A are aligned in a direction substantially perpendicular or parallel to a track direction of the disc.

摘要翻译： 光拾取装置包括：半导体激光二极管发射光通量; 物镜会聚从二极管发射的光束并将光束辐射到光盘上; 衍射光栅分支从光盘反射的光通量; 以及光电检测器，其接收由所述光栅分支的磁通并具有多个光接收部分，其中：所述光栅具有区域A，B和C; 在由光盘的光道衍射的衍射光束中，只有0级衍射光束入射到区域A上，0和±1阶衍射光束入射到区域B; 光电检测器从区域A，B和C中衍射的光通量检测再现信号; 检测在区域A中衍射的+ 1级衍射光束或-1衍射光束的多个光接收部分在与盘的轨道方向基本垂直或平行的方向上对齐。

公开(公告)号：US20130003512A1

公开(公告)日：2013-01-03

申请号：US13533086

申请日：2012-06-26

申请人： Kazuyoshi YAMAZAKI

发明人： Kazuyoshi YAMAZAKI

IPC分类号： G11B7/09 ,  G11B20/18 ,  G11B7/1353

CPC分类号： G11B7/131 ,  G11B7/1353 ,  G11B7/1362 ,  G11B7/1395 ,  G11B2007/0013

摘要： An optical pickup device includes a light source for emitting a light beam, an objective lens for collecting the light beam which is emitted and for irradiating an optical disc with the collected light beam, a diffraction element with a plurality of areas for dividing the light beam which is reflected from the optical disc, a detector with a plurality of detection parts for receiving the light beam which is made to diverge by the diffraction element, and a branching mirror for making the light beam branch into an optical path from the light source to the objective lens and an optical path from the objective lens to the detector. The diffraction element gives an aberration to the light beam diffracted at a specified area.

摘要翻译： 一种光拾取装置，包括用于发射光束的光源，用于收集被发射的光束并用于用收集的光束照射光盘的物镜，具有用于分割光束的多个区域的衍射元件 从光盘反射的检测器，具有用于接收被衍射元件发散的光束的多个检测部件的检测器和用于使光束分支到从光源到光路的光路的分支镜 物镜和从物镜到检测器的光路。 衍射元件给出在特定区域衍射的光束的像差。

公开(公告)号：US20120314556A1

公开(公告)日：2012-12-13

申请号：US13489549

申请日：2012-06-06

申请人： Kazuyoshi YAMAZAKI

发明人： Kazuyoshi YAMAZAKI

IPC分类号： G11B7/135 ,  G11B7/1374 ,  G11B7/127 ,  G11B7/1353

CPC分类号： G11B7/1353 ,  G11B7/0901 ,  G11B2007/0013

摘要： An optical pickup device includes a laser diode for emitting a laser beam, an objective lens for collecting the light beam emitted from the laser diode and irradiating an optical disc with the collected light beam, a diffraction element for making the light beam reflected from the optical disc diverge, and a detector having a plurality of detection parts for receiving the diverging light beams caused by the diffraction element. The diffraction element has first, second, and third divided areas, wherein a 0th-order diffracted light from the first divided area, the second divided area, and the third divided area is detected by at least four divided detection parts; and at least two detection parts for detecting the light beam diffracted at the first divided area into first or higher diffraction order are aligned in a direction generally perpendicular to the track of the optical disc.

摘要翻译： 光拾取装置包括用于发射激光束的激光二极管，用于收集从激光二极管发射的光束并用收集的光束照射光盘的物镜，用于使光束从光学器件反射的衍射元件 以及具有多个用于接收由衍射元件引起的发散光束的检测部件的检测器。 衍射元件具有第一，第二和第三分割区域，其中来自第一分割区域，第二分割区域和第三分割区域的0级衍射光由至少四个分开的检测部分检测; 并且用于将在第一分割区域处衍射的光束检测为第一或更高衍射级的至少两个检测部件在大致垂直于光盘轨道的方向上排列。

公开(公告)号：US20120057445A1

公开(公告)日：2012-03-08

申请号：US13071575

申请日：2011-03-25

申请人： Kazuyoshi YAMAZAKI

发明人： Kazuyoshi YAMAZAKI

IPC分类号： G11B7/135 ,  G11B7/09

CPC分类号： G11B7/1353 ,  G11B7/0903 ,  G11B7/0916 ,  G11B7/131 ,  G11B2007/0013

摘要： For obtaining stable servo-signals without receiving ill influences of stray lights from other layers, on both a focus error signal and a tracking error signal, when recording/reproducing a multi-layer optical disc having small gap between layers thereof, a light beam is divided with using a first and a second diffraction gratings. The first diffraction grating is a polarization diffraction grating, and is mounted on an actuator. The second diffraction grating is disposed on a fixed portion. The first diffraction grating has a first region having a center of a light beam and other(s), and among signal lights reflecting from the disc, the light beam entering into the first region is diffracted, and the light beam entering into the second region transmits therethrough. The second diffraction grating transmits the light beam diffracting on the first region of the polarization diffraction grating therethrough, while diffracting the light beam diffracting on the second region.

摘要翻译： 为了获得稳定的伺服信号而不受到来自其它层的杂散光的不良影响，在聚焦误差信号和跟踪误差信号上，当记录/再现其层之间具有小间隙的多层光盘时，光束为 使用第一和第二衍射光栅分割。 第一衍射光栅是偏振衍射光栅，并安装在致动器上。 第二衍射光栅设置在固定部分上。 第一衍射光栅具有第一区域和第二区域，第一区域具有光束的中心和其他一部分，并且在从盘反射的信号光中，进入第一区域的光束被衍射，并且入射到第二区域的光束 透过。 第二衍射光栅在偏振衍射光栅的第一区域上透射光束衍射，同时衍射第二区域上的光束衍射。

公开(公告)号：US20130229898A1

公开(公告)日：2013-09-05

申请号：US13597787

申请日：2012-08-29

申请人： Kazuyoshi YAMAZAKI ,  Daisuke Tomita

发明人： Kazuyoshi YAMAZAKI ,  Daisuke Tomita

IPC分类号： G11B7/09 ,  G11B7/135 ,  G11B7/1378 ,  G11B7/127

CPC分类号： G11B7/135 ,  G11B7/0903 ,  G11B7/0909 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0013

摘要： Provided is an optical pickup device that suppresses a fluctuation of a tracking error signal caused by stray light when recording/reproducing information on/from an optical disc including a plurality of recording layers and attains size reduction. It includes a laser diode emitting laser light of about 405 nm in wavelength, an objective lens irradiating the optical disc with an optical beam emitted from the laser diode and having a numerical aperture of about 0.85, and a detector including a detection part receiving the optical beam reflected from the optical disc. An optical magnification from the optical disc to the detector is set within a range from about 10× to 15×.

摘要翻译： 提供了一种光学拾取装置，其在从包含多个记录层的光盘上记录/再现信息时，抑制由杂散光引起的跟踪误差信号的波动，并获得尺寸减小。 其包括发射波长约405nm的激光的激光二极管，用从激光二极管发射的光束照射光盘并且具有约0.85的数值孔径的物镜，以及包括接收光学器件的检测部件的检测器 光束从光盘反射。 从光盘到检测器的光学倍率设定在大约10×15×的范围内。

公开(公告)号：US20120213046A1

公开(公告)日：2012-08-23

申请号：US13372529

申请日：2012-02-14

申请人： Kazuyoshi YAMAZAKI

发明人： Kazuyoshi YAMAZAKI

IPC分类号： G11B7/1353 ,  G11B7/1374 ,  G11B20/18 ,  G11B7/1395

CPC分类号： G11B7/1353 ,  G11B7/131 ,  G11B7/1356 ,  G11B7/1367 ,  G11B2007/0013

摘要： In an optical pickup device for a simple optical system, a light beam emitted from a laser diode is split into first and second light beams by a polarized beam splitter, an optical disc is irradiated with the first light beam to obtain signal light, and the second beam is reflected by a reflection element to obtain reference light. Light beams of the signal light and the reference light are synthesized into one light beam, the synthesized light beam is separated into four light beams by a phase difference forming unit including a grating, a divided wave plate and a polarization grating, and different phase differences are afforded to the signal light and the reference light in each light beam. The four light beams are detected by one detector to generate the reproduction signal.

摘要翻译： 在用于简单光学系统的光学拾取装置中，从激光二极管发射的光束被偏振分束器分成第一和第二光束，用第一光束照射光盘以获得信号光，并且 第二光束被反射元件反射以获得参考光。 将信号光和参考光的光束合成为一个光束，通过包括光栅，分隔波片和偏振光栅的相位差形成单元将合成光束分离为四个光束，并且具有不同的相位差 被提供给每个光束中的信号光和参考光。 四个光束由一个检测器检测以产生再现信号。