公开(公告)号：US06992953B2

公开(公告)日：2006-01-31

申请号：US09813898

申请日：2001-03-22

申请人： Mitsuru Sato ,  Junichi Furukawa ,  Kazuo Takahashi ,  Takanori Maeda ,  Hiroshi Nishiwaki ,  Takayuki Nomoto ,  Ikuya Kikuchi

发明人： Mitsuru Sato ,  Junichi Furukawa ,  Kazuo Takahashi ,  Takanori Maeda ,  Hiroshi Nishiwaki ,  Takayuki Nomoto ,  Ikuya Kikuchi

IPC分类号： G11B7/095

CPC分类号： G11B7/1353 ,  G11B7/0901 ,  G11B7/0912 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/1381

摘要： A tracking servo apparatus in which reflection light obtained when a laser beam is irradiated onto a recording surface of an optical disc is photoelectrically converted, thereby obtaining a photoelectric conversion signal, a tracking error signal showing a deviation amount of an irradiating position of said laser beam for a track in a disc radial direction on the recording surface is generated by the photoelectric conversion signal, a spherical aberration occurring in an optical system is detected, a level of the tracking error signal is corrected on the basis of the detection result, and the irradiating position of the laser beam is moved in the disc radial direction in accordance with the level-corrected tracking error signal.

摘要翻译： 一种跟踪伺服装置，其中将激光束照射到光盘的记录表面上时获得的反射光被光电转换，从而获得光电转换信号，表示所述激光束的照射位置的偏差量的跟踪误差信号 通过光电转换信号产生在记录表面上的磁盘径向方向上的轨迹，检测出在光学系统中发生的球面像差，根据检测结果校正跟踪误差信号的电平，并且 根据电平校正的跟踪误差信号，激光束的照射位置沿盘径向移动。

公开(公告)号：US06885616B2

公开(公告)日：2005-04-26

申请号：US09765306

申请日：2001-01-22

申请人： Ikuya Kikuchi ,  Takanori Maeda ,  Mitsuru Sato

发明人： Ikuya Kikuchi ,  Takanori Maeda ,  Mitsuru Sato

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

CPC分类号： G11B7/1353 ,  G11B7/0908 ,  G11B7/0943 ,  G11B7/1369 ,  G11B7/1378 ,  G11B7/1381 ,  G11B7/13925 ,  G11B2007/0006

摘要： A phase device for providing a phase difference between an inner radius portion and an outer radius portion of a light beam which is emitted from a light source is provided in an optical path between the light source of an optical pickup apparatus and an objective lens. The light beam to which the phase difference has been provided is converged by the objective lens and irradiated to an optical disc. An interference of an inner radius portion and an outer radius portion of the returning light beam caused when the light beam is diffracted by the optical disc with ±1 primary diffracted light caused by the diffraction is suppressed. Therefore, an intensity fluctuation of the returning light beam caused by the interference is suppressed. A spherical aberration error showing a thickness error of the optical disc and a focusing error having a high linearity can be detected with high precision on the basis of the returning light. A numerical aperture of the objective lens, consequently, can be increased, high density information recording and information reproduction can be performed, and further, an optical pickup apparatus and an information recording and/or reproducing apparatus each having compatibility are realized.

摘要翻译： 在光拾取装置的光源和物镜之间的光路中设置用于提供从光源发射的光束的内半径部分和外半径部分之间的相位差的相位装置。 已经提供了相位差的光束被物镜会聚并照射到光盘。 抑制由衍射引起的±1次衍射光使光束被光盘衍射时引起的返回光束的内径部和外径部的​​干涉。 因此，抑制由干涉引起的返回光束的强度波动。 可以基于返回光以高精度检测出表示光盘的厚度误差的球面像差误差和高线性度的聚焦误差。 因此，可以增加物镜的数值孔径，可以执行高密度信息记录和信息再现，并且还实现了具有兼容性的光学拾取装置和信息记录和/或再现装置。

公开(公告)号：US06804185B2

公开(公告)日：2004-10-12

申请号：US09738949

申请日：2000-12-18

申请人： Ikuya Kikuchi ,  Takanori Maeda ,  Mitsuru Sato ,  Masayuki Iwasaki

发明人： Ikuya Kikuchi ,  Takanori Maeda ,  Mitsuru Sato ,  Masayuki Iwasaki

IPC分类号： G11B700

CPC分类号： G11B7/1381 ,  G11B7/1369

摘要： A variable optical unit is provided with at least two phase-shift regions for providing light with phase differences. Phase-shift amount of the phase-shift region is adjusted by the applied voltage in accordance with birefringence of an information medium. A light beam emitted from a light source is incident on the variable optical unit through a collimator lens and a beam splitter. The light beam is polarized in accordance with the aforementioned phase-shift amount of the variable optical unit and converged by an objective lens to radiate the information medium. The reflected light polarized due to the effect of the birefringence of the information medium is polarized again according to the phase-shift amount of the variable optical unit. The reflected light is thereby polarized in the direction in which the beam splitter can reflect the reflected light and then the reflected light reflected by the beam splitter is detected by the condenser lens and an optical detector.

摘要翻译： 可变光学单元设置有至少两个相移区域，用于提供具有相位差的光。 根据信息介质的双折射，通过施加的电压来调整相移区域的相移量。 从光源发射的光束通过准直透镜和分束器入射在可变光学单元上。 光束根据上述可变光学单元的相移量被偏振，并由物镜会聚以辐射信息介质。 由于信息介质的双折射效应而偏振的反射光根据可变光学单元的相移量再次被极化。 因此，反射光在分束器能够反射反射光的方向上偏振，然后由聚光透镜和光学检测器检测由分束器反射的反射光。

公开(公告)号：US06667947B2

公开(公告)日：2003-12-23

申请号：US09988813

申请日：2001-11-20

申请人： Takanori Maeda ,  Ikuya Kikuchi ,  Makoto Sato ,  Katsuhiro Koike ,  Yoshitsugu Araki

发明人： Takanori Maeda ,  Ikuya Kikuchi ,  Makoto Sato ,  Katsuhiro Koike ,  Yoshitsugu Araki

IPC分类号： G11B724

CPC分类号： G11B7/1374 ,  G11B7/00718 ,  G11B7/1378 ,  G11B7/139 ,  G11B7/13925 ,  G11B7/24 ,  G11B7/24038 ,  G11B11/10584 ,  G11B2007/13727

摘要： The present invention relates to an optical multi-layer information recording medium for recording information therein and/or retrieving information therefrom upon radiation of a convergent beam of light. The recording medium includes at least two pairs of recording layer and light-transmissive layer stacked one after another. A first recording layer proximal to a beam radiation side and a second recording layer distal from the beam radiation side are made from a material that satisfies a function including the following parameters; transmissivity and absorptance of the first recording layer, absorptance of the second recording layer, a numerical aperture on the first recording layer, a numerical aperture of the second recording layer, and transmissivity of between the first and second recording layers. Even if the numerical apertures change with spherical aberration compensation made to respective recording layers, a power density of a light spot does not change. Thus, recordation can be performed with consistent recording characteristics.

公开(公告)号：US06594091B2

公开(公告)日：2003-07-15

申请号：US09999195

申请日：2001-12-03

申请人： Takanori Maeda ,  Ikuya Kikuchi ,  Katsuhiro Koike ,  Makoto Sato

发明人： Takanori Maeda ,  Ikuya Kikuchi ,  Katsuhiro Koike ,  Makoto Sato

IPC分类号： G02B1318

CPC分类号： G02B27/0025 ,  G11B7/1378 ,  G11B7/139 ,  G11B7/13925

摘要： The present invention relates to an optical pickup having a constant numerical aperture even if spherical aberration is compensated for. The optical pickup is used in an information recording and/or reproducing machine. The information recording and/or reproducing machine records and/or reproduces information in a recording medium upon radiation of a light beam from a light source. The optical pickup includes a condensing optical system for condensing the light beam from the light source onto a recording layer of the recording medium. The condensing optical system includes an object lens. The condensing optical system also includes an aperture positioned about a focal length of the object lens apart from a position of a principal incidence plane of the object lens toward the light source along an optical axis of the condensing optical system.

公开(公告)号：US06339570B1

公开(公告)日：2002-01-15

申请号：US09385011

申请日：1999-08-27

申请人： Ikuya Kikuchi ,  Takanori Maeda

发明人： Ikuya Kikuchi ,  Takanori Maeda

IPC分类号： G11B700

CPC分类号： G11B7/1353 ,  G01B11/06 ,  G11B7/127 ,  G11B7/131 ,  G11B7/1356 ,  G11B7/1374 ,  G11B7/1381 ,  G11B7/13927 ,  G11B2007/0006

摘要： A light source is provided for emitting a light beam. The light beam from the light source is applied to a recording and reproducing plane of an optical disc and to a front surface of a transparent substrate of the optical disc. A photodetector is provided for detecting return light beams from the recording and reproducing plane and the front surface. A first signal is generated based on an output signal of the photodetector dependent on the return light beam from the recording and reproducing plane, and a second signal is generated based on an output signal of the photodetector dependent on the return light beam from the front surface. A signal relating to thickness information on a thickness of the transparent substrate is produced by comparing the first and second signals with each other.

摘要翻译： 提供用于发射光束的光源。 来自光源的光束被施加到光盘的记录和再现平面以及光盘的透明基板的前表面。 提供了用于检测来自记录和再现平面和前表面的返回光束的光电检测器。 基于取决于来自记录和再现平面的返回光束的光电检测器的输出信号产生第一信号，并且基于取决于来自前表面的返回光束的光电检测器的输出信号产生第二信号 。 通过将第一和第二信号彼此进行比较来产生与透明基板的厚度有关的厚度信息的信号。

公开(公告)号：US06751175B1

公开(公告)日：2004-06-15

申请号：US09458074

申请日：1999-12-10

申请人： Takanori Maeda ,  Ikuya Kikuchi

发明人： Takanori Maeda ,  Ikuya Kikuchi

IPC分类号： G11B700

CPC分类号： G11B7/1378 ,  G11B7/0956 ,  G11B7/13927 ,  G11B2007/13727

摘要： An aberration correcting device is placed in an optical path extending from a light source of an optical pickup apparatus for irradiating a light beam onto an optical disk to the optical disk. The device includes a pair of light-transmission substrates at least one of which is held freely movable in a way that a major surface thereof moves in a direction vertical to the optical path, and which have complementary curved surfaces facing, and apart from, each other. The curved surfaces are formed in such a manner as to cause the optical path length of a light beam transmitting the pair of light-transmission substrates to be changed by movement of the light-transmission substrates, thus imparting a phase difference to a transmitting light beam, while allowing the phase difference to keep an advancing direction of the light beam thereby to minimize a comatic aberration caused by the optical disk.

摘要翻译： 像差校正装置被放置在从用于将光束照射到光盘上的光学拾取装置的光源延伸到光盘的光路中。 该装置包括一对光透射基板，其中至少一个透光基板可以以其主表面沿垂直于光路的方向移动的方式保持自由移动，并且具有面对每一个的互补弯曲表面 其他。 弯曲表面形成为使得透过该透光性基板的光束的光路长度由于透光性基板的移动而变化，由此赋予发送光束的相位差 同时允许相位差保持光束的前进方向，从而最小化由光盘引起的彗形像差。

公开(公告)号：US06683732B2

公开(公告)日：2004-01-27

申请号：US10046538

申请日：2002-01-16

申请人： Takanori Maeda ,  Ikuya Kikuchi ,  Yoshitsugu Araki

发明人： Takanori Maeda ,  Ikuya Kikuchi ,  Yoshitsugu Araki

IPC分类号： G02B702

CPC分类号： G11B7/1374 ,  G11B7/121

摘要： The collision preventing device is used for an optical pickup device for recording or reproducing information to or from an optical information recording medium. The collision preventing device has a shock absorbing layer to prevent a contact of an objective lens and a surface of the recording medium. The shock absorbing layer is laminated on the portion extending from the circumferential edge of the effective-diameter area of the objective lens to the outside edge or to the outside of the objective lens and has a thickness in such a manner that the shock absorbing layer comes in contact with the surface of the recording medium prior to the effective-diameter area, when the objective lens comes close to the surface of the recording medium.

摘要翻译： 防撞装置用于向光学信息记录介质记录或再现信息的光学拾取装置。 防碰撞装置具有防止物镜与记录介质的表面接触的冲击吸收层。 冲击吸收层层叠在从物镜的有效直径区域的周缘延伸到物镜的外侧边缘或外部的部分上，并且具有使得减震层到达的厚度 在有效直径区域之前，当物镜靠近记录介质的表面时与记录介质的表面接触。

公开(公告)号：US06584065B1

公开(公告)日：2003-06-24

申请号：US09729913

申请日：2000-12-06

申请人： Takanori Maeda ,  Ikuya Kikuchi

发明人： Takanori Maeda ,  Ikuya Kikuchi

IPC分类号： G11B700

CPC分类号： G11B7/13927 ,  G11B7/00736 ,  G11B7/0945 ,  G11B7/0956 ,  G11B7/12

摘要： An information recording at a high density to an information recording medium and a proper reproduction of information which has been recorded on the information recording medium at a high density are realized. Optical characteristics of an information recording medium are measured and information regarding the measured optical characteristics is previously recorded in a proper area on the information recording medium. When an information recording system records information to the information recording medium on which the information regarding the optical characteristics has been recorded, the information regarding the optical characteristics is read and a proper information recording state is adjusted on the basis of the information regarding the optical characteristics, thereby allowing the information recording to be performed. When an information reproducing system reproduces the information from the information recording medium on which the information regarding the optical characteristics has been recorded, the information regarding the optical characteristics is read and a proper information reproducing state is adjusted on the basis of the information regarding the optical characteristics, thereby allowing the information reproduction to be performed.

摘要翻译： 实现了以高密度向信息记录介质记录的信息和以高密度记录在信息记录介质上的信息的适当再现。 测量信息记录介质的光学特性，并且将关于所测量的光学特性的信息预先记录在信息记录介质上的适当区域中。 当信息记录系统将信息记录在其上已经记录关于光学特性的信息的信息记录介质时，读取关于光学特性的信息，并且基于关于光学特性的信息来调整适当的信息记录状态 从而允许执行信息记录。 当信息再现系统从信息记录介质再现关于光学特性的信息的信息时，读取​​关于光学特性的信息，并根据关于光学特性的信息调整适当的信息再现状态 特性，从而允许执行信息再现。

公开(公告)号：US06529339B2

公开(公告)日：2003-03-04

申请号：US09940675

申请日：2001-08-29

申请人： Takanori Maeda ,  Katsuhiro Koike ,  Ikuya Kikuchi ,  Makoto Sato

发明人： Takanori Maeda ,  Katsuhiro Koike ,  Ikuya Kikuchi ,  Makoto Sato

IPC分类号： G02B702

CPC分类号： G02B7/021

摘要： A lens made of at least one of a resin and glass includes a lens effective diameter area, a peripheral area formed integral with the lens effective diameter area and located at a periphery of the lens effective diameter area, and at least one marker area located in the peripheral area and formed on a circle whose center is a center of the lens effective diameter area.