公开(公告)号：US06594221B2

公开(公告)日：2003-07-15

申请号：US09953453

申请日：2001-09-17

申请人： Masakazu Ogasawara

发明人： Masakazu Ogasawara

IPC分类号： G11B700

CPC分类号： G11B7/1381 ,  G11B7/0903 ,  G11B7/0912 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1365

摘要： An optical pickup device includes an illuminating optical system for focusing light beams, split in a main beam and at least one side beam, onto a track on an information storage surface of an optical storage medium to form optical spots thereon. The device also includes a light detecting optical system for introducing return light reflected back from the information storage surface and a polarizing optical element. The polarizing optical element has regions split at the center of an optical path by a parting line extending at least either in a direction of extension of the track or in a direction perpendicular to the direction of extension. The polarizing optical element also splits the main beam return light at least in two for each of the regions on a plane perpendicular to the optical path of the return light of the reflected main beam in the light detecting optical system. The polarizing optical element is disposed where the return light of the main and side beams is spatially separated. The optical pickup device further includes an optical detector disposed in contact with the polarizing optical element. The optical detector has a plurality of main-beam light-receiving elements for receiving the separated main beam return light and a plurality of side-beam light-receiving elements for receiving the separated side beam return light.

公开(公告)号：US6141304A

公开(公告)日：2000-10-31

申请号：US60162

申请日：1998-04-15

申请人： Masakazu Ogasawara

发明人： Masakazu Ogasawara

IPC分类号： G11B7/135 ,  G11B7/00 ,  G11B7/095 ,  G11B7/125

CPC分类号： G11B7/13927 ,  G11B7/0956 ,  G11B7/1369 ,  G11B2007/0006

摘要： An optical pickup includes a laser light source emitting a laser beam, an objective lens collecting the laser beam, and a wavefront-aberration correcting device provided on an optical axis of the laser beam and adapted to change a refractive index by controlling voltage. During reproduction of an optical disk, the wavefront-aberration correcting device corrects a wavefront aberration occurring due to a tilting of the optical disk, or corrects both the wavefront aberration occurring due to the tilting of the optical disk and a wavefront aberration due to the thickness of a substrate of the optical disk.

摘要翻译： 光拾取器包括发射激光束的激光光源，收集激光束的物镜和设置在激光束的光轴上并适于通过控制电压来改变折射率的波前像差校正装置。 在再现光盘期间，波前像差校正装置校正由于光盘的倾斜而发生的波前像差，或校正由于光盘的倾斜而产生的波前像差和由于厚度引起的波前像差 的光盘的基板。

公开(公告)号：US6124988A

公开(公告)日：2000-09-26

申请号：US96536

申请日：1998-06-12

申请人： Takuma Yanagisawa ,  Katsuhiro Koike ,  Masakazu Ogasawara

发明人： Takuma Yanagisawa ,  Katsuhiro Koike ,  Masakazu Ogasawara

IPC分类号： G02B13/00 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135 ,  G02B13/18 ,  G02B3/10

CPC分类号： G11B7/1374 ,  G11B7/1367 ,  G11B7/13922 ,  G11B2007/0006

摘要： An objective lens that allows spherical aberration to be suppressed during the reproduction of a CD without sacrificing reproduction characteristics of a DVD, has a first numerical aperture comprising a refracting surface that is in rotatory symmetry about an optical axis. A part of the refracting surface is displaced along the optical axis as an annular concave (or convex) portion centered on the optical axis. The annular concave (or convex) portion has a certain inner diameter r.sub.1 and a certain outer diameter r.sub.2 that reduce RMS aberration V to a value close to a minimum value. The annular portion has a certain depth (or height).

摘要翻译： 在CD的再现期间允许球面像差被抑制的物镜，而不牺牲DVD的再现特性，具有第一数值孔径，其包括围绕光轴旋转对称的折射表面。 折射表面的一部分作为中心在光轴上的环形凹（或凸）部分沿着光轴移位。 环形凹（或凸）部分具有一定的内径r1和一定的外径r2，其将RMS像差V降低到接近最小值的值。 环形部分具有一定的深度（或高度）。

公开(公告)号：US20120069723A1

公开(公告)日：2012-03-22

申请号：US13265684

申请日：2009-04-24

申请人： Makoto Sato ,  Masakazu Ogasawara ,  Kazuo Takahashi ,  Masaharu Nakano

发明人： Makoto Sato ,  Masakazu Ogasawara ,  Kazuo Takahashi ,  Masaharu Nakano

IPC分类号： G11B7/00

CPC分类号： G11B7/0938 ,  G11B7/0908 ,  G11B7/1356 ,  G11B7/1378 ,  G11B7/139 ,  G11B7/13925 ,  G11B2007/0013

摘要： An optical recording medium drive device including: a combining prism for combining a recording first laser beam emitted from a first light source with a recording second laser beam emitted from the first light source so as to coaxially guide them; an objective lens for condensing the first and second laser beams from the combining prism toward an optical recording medium; a first photodetecting means for detecting reflected light of the first laser beam from a recording layer; a second photodetecting means for detecting reflected light of the second laser beam from a guide layer; a magnification conversion element disposed on an optical path of the second laser beam between a second light source and the combining prism for diffusing or converging the second laser beam incident upon the objective lens; a first focus error generating means for generating a first focus error signal indicating an error between a condensed spot position of the first laser beam and the recording layer based on an output signal of the first photodetecting means; a second focus error generating means for generating a second focus error signal indicating an error between a condensed spot position of the second laser beam and the guide layer based on an output signal of the second photodetecting means; a first focus control means for controlling the objective lens in an optical axis direction thereof in accordance with the first focus error signal; and a second focus control means for controlling a magnitude of the diffusion or convergence of the second laser beam by the magnification conversion element in accordance with the second focus error signal.

摘要翻译： 一种光记录介质驱动装置，包括：组合棱镜，用于将从第一光源发射的记录第一激光束与从第一光源发射的记录第二激光束组合以同轴地引导它们; 用于将来自组合棱镜的第一和第二激光束聚光到光学记录介质的物镜; 用于从记录层检测第一激光束的反射光的第一光检测装置; 用于从引导层检测第二激光束的反射光的第二光电检测装置; 放大转换元件，设置在所述第二激光束的光路上，在第二光源与所述组合棱镜之间，用于使入射到所述物镜上的所述第二激光束扩散或会聚; 第一聚焦误差产生装置，用于基于第一光电检测装置的输出信号产生指示第一激光束的聚光点位置与记录层之间的误差的第一聚焦误差信号; 第二聚焦误差产生装置，用于基于第二光电检测装置的输出信号产生指示第二激光束的聚光点位置与引导层之间的误差的第二聚焦误差信号; 第一聚焦控制装置，用于根据第一聚焦误差信号在其光轴方向上控制物镜; 以及第二焦点控制装置，用于根据第二聚焦误差信号来控制放大转换元件的第二激光束的扩散或会聚的大小。

公开(公告)号：US08125872B2

公开(公告)日：2012-02-28

申请号：US12441731

申请日：2007-03-19

申请人： Masakazu Ogasawara

发明人： Masakazu Ogasawara

IPC分类号： G11B7/00

CPC分类号： G11B7/252 ,  G11B7/24033 ,  G11B7/24038 ,  G11B7/24062 ,  G11B2007/0009

摘要： Disclosed herein is a recording medium on or from which the recording or reproduction of data is stably performed. On the recording medium, data are recorded three-dimensionally by the irradiation of a recording laser beam. The recording medium includes a reflection control layer including a plurality of reflection layers stacked in a film thickness direction, each reflection layer having a connection terminal, each reflection layer exhibiting reflectivity and transmissivity changeable in response to an electrical signal supplied to the connection terminal and a recording layer disposed at a beam incidence side of the reflection control layer.

摘要翻译： 这里公开了一种记录媒体，其中数据的记录或再现被稳定地执行。 在记录介质上，通过记录激光束的照射三维地记录数据。 记录介质包括反射控制层，反射控制层包括沿膜厚度方向堆叠的多个反射层，每个反射层具有连接端子，每个反射层具有响应于提供给连接端子的电信号而变化的反射率和透射率， 记录层，设置在反射控制层的光束入射侧。

公开(公告)号：US08111604B2

公开(公告)日：2012-02-07

申请号：US12593036

申请日：2007-03-29

申请人： Masaharu Nakano ,  Masakazu Ogasawara ,  Makoto Sato

发明人： Masaharu Nakano ,  Masakazu Ogasawara ,  Makoto Sato

IPC分类号： G11B7/24

CPC分类号： G11B7/26 ,  G11B7/0045 ,  G11B7/00745 ,  G11B7/0908 ,  G11B7/24038

摘要： A fabrication method of a multilayer optical recording medium having a plurality of recording layers, comprises a step of preparing an optical recording medium having at least one record area; a write-position mark generating step of recording write-position marks in the record area beforehand; a step of preparing an optical system including a common objective lens to focus a data recording beam and a position mark recording beam on different positions in a thickness direction of the record area; a first data writing step of writing data between the write-position marks with following the write-position marks by the data recording beam; a position mark recording step of, in parallel with the first data writing step, recording new write-position marks in the record area by the position mark recording beam; and a second data writing step of writing data between the new write-position marks with following the new write-position marks by the data recording beam.

摘要翻译： 一种具有多个记录层的多层光学记录介质的制造方法，包括制备具有至少一个记录区域的光学记录介质的步骤; 写入位置标记生成步骤，预先在记录区域中记录写入位置标记; 准备包括用于将数据记录光束和位置标记记录光束聚焦在记录区域的厚度方向上的不同位置上的公共物镜的光学系统的步骤; 第一数据写入步骤，在写入位置标记之间通过数据记录光束跟随写入位置标记来写入数据; 位置标记记录步骤，与第一数据写入步骤并行，通过位置标记记录光束在记录区域中记录新的写入位置标记; 以及第二数据写入步骤，用于通过数据记录光束在新的写入位置标记之间写入新的写入位置标记之间的数据。

公开(公告)号：US07969836B2

公开(公告)日：2011-06-28

申请号：US12521959

申请日：2007-01-05

申请人： Takuma Yanagisawa ,  Masakazu Ogasawara ,  Makoto Sato

发明人： Takuma Yanagisawa ,  Masakazu Ogasawara ,  Makoto Sato

IPC分类号： G11B7/00

CPC分类号： G11B7/133 ,  G11B7/0903 ,  G11B7/094 ,  G11B7/131

摘要： An optical pickup apparatus reads an information signal recorded on a recording surface of an optical disk along a track by projecting a light beam. Said optical pickup apparatus has: an objective lens for converging said light beam onto said recording surface; an objective lens moving device for moving said objective lens in a radial direction of said optical disk; and a divisional photosensing device for receiving return light reflected by said optical disk, in a plurality of divided regions. Said divisional photosensing device has: a first divisional photosensing device for dividing a first region including both edge portions in said radial direction of said return light, in two divided areas in said radial direction; a second divisional photosensing device for receiving a second region including both edge portions in a direction which perpendicularly crosses said radial direction of said return light, in two divided areas in said radial direction; and a third divisional photosensing device for receiving a third region including an almost center portion of said return light, in two divided areas in said radial direction.

摘要翻译： 光拾取装置通过投影光束沿着轨道读取记录在光盘的记录表面上的信息信号。 所述光学拾取装置具有：用于将所述光束会聚到所述记录表面上的物镜; 用于在所述光盘的径向上移动所述物镜的物镜移动装置; 以及分割光敏装置，用于在多个分割区域中接收由所述光盘反射的返回光。 所述分光感测装置具有：第一分光感测装置，用于在所述径向方向上的两个分割区域中分割包括所述返回光的所述径向方向上的两个边缘部分的第一区域; 第二分光光感测装置，用于在所述径向方向的两个分割区域中接收包括垂直于所述返回光的所述径向方向的两个边缘部分的第二区域; 以及第三分光感测装置，用于在所述径向方向上的两个分割区域中接收包括所述返回光的几乎中心部分的第三区域。

公开(公告)号：US20100232278A1

公开(公告)日：2010-09-16

申请号：US12294455

申请日：2007-03-14

申请人： Masakazu Ogasawara

发明人： Masakazu Ogasawara

IPC分类号： G11B7/00

CPC分类号： G11B7/00781 ,  G11B7/0065

摘要： A recording method which optically records two-dimensional data including a positioning mark and data area in a recording medium. In this method, the state of the positioning mark is changed from a first state to at least one second state different from the first state every given number of recording times of such two-dimensional data.

摘要翻译： 一种记录方法，其将包括定位标记和数据区的二维数据光记录在记录介质中。 在该方法中，定位标记的状态从这样的二维数据的每给定数量的记录次数从第一状态改变为与第一状态不同的至少一个第二状态。

公开(公告)号：US20090278029A1

公开(公告)日：2009-11-12

申请号：US12441839

申请日：2006-11-01

申请人： Masakazu Ogasawara ,  Takuma Yanagisawa ,  Makoto Sato

发明人： Masakazu Ogasawara ,  Takuma Yanagisawa ,  Makoto Sato

IPC分类号： G02B27/40 ,  G02B27/64

CPC分类号： G11B7/094 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/1395 ,  G11B2007/0013

摘要： A pickup device includes an irradiation optical system containing an objective lens for forming a spot by converging a light beam onto a track of a recording surface of an optical recording medium having a plurality of laminated recording layers; and a detection optical system containing a photodetector for receiving, through the objective lens, return light which was reflected and returned from the spot to perform a photoelectric conversion, in which a position of the objective lens is controlled in response to an electric signal arithmetically operated from an output of the photodetector. The photodetector includes a plurality of photosensing element groups which are arranged away from each other on a plane to which an optical axis of the return light penetrates perpendicularly and each of the groups is composed of a plurality of photosensing elements. The pickup device further comprises a dividing element disposed on another plane to which the optical axis of the return light penetrates perpendicularly. The dividing element has: at least two division regions which are formed so as to be line-symmetrical with respect to a track directional line which intersects with the optical axis of the return light and extends in parallel with the track; at least two division regions which are formed so as to be line-symmetrical with respect to a track vertical line which intersects with the optical axis of the return light and extends in the direction perpendicular to the track; and a center division region which includes the optical axis of the return light and is formed so as to be point-symmetrical with respect to the optical axis of the return light. The dividing element divides the return light into a plurality of partial light beams at respective division regions to deflecting the partial light beams from the division regions other than the center division region to the photosensing element groups.

摘要翻译： 拾取装置包括照射光学系统，其包含用于通过将光束会聚到具有多个层压记录层的光学记录介质的记录表面的轨道上而形成点的物镜; 以及检测光学系统，其包含光检测器，用于通过物镜接收从点反射和返回的返回光，以进行光电转换，其中物镜的位置响应于电信号被算术运算 从光电检测器的输出。 光电检测器包括多个光敏元件组，它们在返回光的光轴垂直穿过的平面上彼此远离布置，并且每个组由多个感光元件组成。 拾取装置还包括设置在返回光的光轴垂直穿过的另一平面上的分隔元件。 分割元件具有至少两个划分区域，其形成为相对于与返回光的光轴相交并且与轨道平行延伸的轨道方向线线对称; 至少两个划分区域，其形成为相对于与返回光的光轴相交的轨道垂直线线性对称，并且在垂直于轨道的方向上延伸; 以及包括返回光的光轴并形成为相对于返回光的光轴点对称的中心分割区域。 分割元件将返回光分成各个分割区域的多个局部光束，以将来自除了中心分割区域之外的分割区域的部分光束偏转到光敏元件组。

公开(公告)号：US20090201787A1

公开(公告)日：2009-08-13

申请号：US12307853

申请日：2007-07-13

申请人： Masakazu Ogasawara ,  Takuma Yanagisawa ,  Katsuhiro Koike

发明人： Masakazu Ogasawara ,  Takuma Yanagisawa ,  Katsuhiro Koike

IPC分类号： G11B7/00

CPC分类号： G11B7/1353 ,  G11B7/0909 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1378 ,  G11B2007/0013

摘要： A pickup device includes an irradiation optical system including an object lens for focusing light flux on a track of a recording surface of an optical recording media having a plurality of recording layers stacked while a spacer layer is interposed between the recording layers to form a spot and a detection optical system including an photo detector having a plurality of light receiving parts for receiving returning light reflected from the spot through the object lens to perform photoelectric conversion. The pickup device controls a position of the object leans according to an electrical signal calculated from outputs of the light receiving parts. The pickup device further includes an astigmatic device for providing astigmatism to the returning light directed to the light receiving parts and a division device, having divisional regions divided by a division line extending in an astigmatic direction about an optical axis of the returning light, for dividing the returning light having the astigmatism into a plurality of partial light fluxes divided for the respective divisional regions along the optical axis of returning light. The neighboring divisional regions provide the partial light fluxes with an optical action so that interference between the corresponding partial light fluxes does not occur on the light receiving parts.

摘要翻译： 拾取装置包括：照射光学系统，包括用于将光束聚焦在具有堆叠的多个记录层的光学记录介质的记录表面的轨道上的物镜，同时隔离层插入在记录层之间以形成点， 一种检测光学系统，包括具有多个光接收部分的光检测器，用于接收通过物镜从该点反射的返回光，以执行光电转换。 拾取装置根据从光接收部分的输出计算的电信号来控制物体倾斜的位置。 拾取装置还包括用于向指向光接收部分的返回光提供像散的像散装置和分割装置，该分割装置具有被围绕返回光的光轴沿像散方向延伸的分割线划分的分割区域，用于分割 将具有像散的返回光分离成沿着返回光的光轴分割成各分区的多个部分光束。 相邻分割区域提供具有光学作用的部分光束，使得在光接收部分上不发生对应的部分光束之间的干涉。