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.

公开(公告)号：US06518555B1

公开(公告)日：2003-02-11

申请号：US09270753

申请日：1999-03-17

申请人： Ikuya Kikuchi ,  Yoshitsugu Araki

发明人： Ikuya Kikuchi ,  Yoshitsugu Araki

IPC分类号： G01B2740

CPC分类号： G11B7/1353 ,  G11B7/1365 ,  G11B7/1378 ,  G11B7/139 ,  G11B2007/0006

摘要： A polarization hologram lens includes: a first portion, positioned at a center of the hologram lens, on which no grating pattern is formed; and a second portion, positioned at an outer circumferential area of the first portion, on which grating patterns are formed, wherein the grating patterns do not diffract a light beam of a first polarization direction, and wherein the grating patterns diffract a light beam of a second polarization direction perpendicular to the first polarization direction to produce a diverging diffracted light or a converging diffracted light.

摘要翻译： 偏振全息透镜包括：位于全息透镜中心的第一部分，其上没有形成光栅图案; 以及位于所述第一部分的外周区域处的第二部分，其上形成有光栅图案，其中所述光栅图案不衍射第一偏振方向的光束，并且其中所述光栅图案衍射出 垂直于第一偏振方向的第二偏振方向，以产生发散衍射光或会聚衍射光。

公开(公告)号：US06320699B1

公开(公告)日：2001-11-20

申请号：US09501309

申请日：2000-02-10

申请人： Takanori Maeda ,  Ikuya Kikuchi

发明人： Takanori Maeda ,  Ikuya Kikuchi

IPC分类号： G02B2714

CPC分类号： G02B27/0025 ,  G02B5/3083 ,  G02B26/0875 ,  G11B7/0948 ,  G11B7/1367 ,  G11B7/13927

摘要： An aberration correcting apparatus and an optical pickup apparatus using this apparatus, in which a spherical aberration based on a thickness error of an optical disc substrate can be preferably eliminated and a thickness error permission range of the optical disc substrate can be widened even if an objective lens of a high numerical aperture is used. The aberration correcting apparatus is arranged on an optical axis of an optical path in an optical apparatus, the aberration correcting apparatus comprises a pair of light transmitting substrates each of which is arranged so as to intersect perpendicularly to the optical axis, wherein at least one of the light transmitting substrates is held rotatably around the optical axis, each of the light transmitting substrates has distributions of optical path lengths which mutually complementarily decrease or increase within a predetermined range on a concentric circle in which the optical axis is set to the center, and the distribution of the total optical path length of the pair of light transmitting substrates is uniformly changed within the predetermined range on the concentric circle in which the optical axis is set to the center in accordance with the rotation of the light transmitting substrate, thereby applying a phase difference to the transmitted light beam.

摘要翻译： 使用该装置的像差校正装置和光拾取装置，其中可以优选地消除基于光盘基板的厚度误差的球面像差，并且即使目标方式也可以扩大光盘基板的厚度误差允许范围 使用高数值孔径的透镜。 像差校正装置配置在光学装置的光路的光轴上，像差校正装置包括一对透光基板，每个透光基板布置成垂直于光轴交叉，其中至少一个 透光基板保持围绕光轴可旋转地保持，每个透光基板具有在光轴被设定为中心的同心圆上在预定范围内相互互补地减小或增加的光程长度的分布，以及 根据透光基板的旋转，使一对透光基板的总光路长度的分布在光轴被设定为中心的同心圆上的规定范围内均匀地变化， 相对于透射光束的相位差。

公开(公告)号：US5333124A

公开(公告)日：1994-07-26

申请号：US524932

申请日：1990-05-18

申请人： Ikuya Kikuchi ,  Ryo Sato

发明人： Ikuya Kikuchi ,  Ryo Sato

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B13/04 ,  G11B11/12

CPC分类号： G11B11/10576 ,  G11B11/10552

摘要： A magnetic optical disk player comprises a turn table for turning a magnetic optical disk, a recording head and an erasing head movable along two different radial directions of the turn table respectively, and bias magnets for generating bias magnetic fields distributed along moving areas of the recording and erasing heads and having the directions opposite to each other, wherein the recording head and the erasing head each includes an objective, movable coils coupled with the objective, and drive magnet for generating a drive magnetic field interlinking the movable coils in the same direction as that of the bias magnetic fields. The directions of the bias magnetic fields for erasing and recording heads are opposite to each other. The magnetic fields for generating electromagnetic forces to drive the objective in the erasing head and the recording head are also opposite to each other. The bias magnetic field and the magnetic field for generating the electromagnetic force are additively coupled with each other in each head.

摘要翻译： 磁性光盘播放器包括用于转动磁光盘的转台，记录头和可沿着转台的两个不同径向方向移动的擦除头，以及用于产生沿着记录的移动区域分布的偏置磁场的偏置磁体 以及擦除头部并且具有彼此相反的方向，其中记录头和擦除头各自包括物镜，与物镜耦合的可动线圈和驱动磁体，用于产生驱动磁场，该驱动磁场将可动线圈与 偏磁场的。 用于擦除和记录头的偏置磁场的方向彼此相反。 用于产生用于驱动擦除头和记录头中的物镜的电磁力的磁场也彼此相反。 用于产生电磁力的偏置磁场和磁场在每个磁头中相互耦合。

公开(公告)号：US5034934A

公开(公告)日：1991-07-23

申请号：US297727

申请日：1989-01-17

申请人： Ryuichi Naito ,  Ikuya Kikuchi ,  Yoshihiro Utsumi

发明人： Ryuichi Naito ,  Ikuya Kikuchi ,  Yoshihiro Utsumi

IPC分类号： G11B11/105 ,  G11B19/02 ,  G11B27/19 ,  G11B27/30 ,  G11B27/36

CPC分类号： G11B11/10515 ,  G11B11/10595 ,  G11B11/10597 ,  G11B19/02 ,  G11B27/19 ,  G11B27/3027 ,  G11B27/36 ,  G11B2220/2525

摘要： An opto-magnetic disk unit is constructed so that predetermined areas existing in the front of the unit recording areas can be detected. In addition, at least one of first and second saturation magnetizations are recorded on each of the detected predetermined areas. At the time of reproduction, signal processing on the output of the pickup is performed after a part of the output of the pickup corresponding to the one section of the predetermined area is clamped to a predetermined level. Also at the time of reproduction, gain controlling of a circuit for signal processing the output of the pickup may be performed based on the level difference between the signal read from a first saturation magnetization section and the signal read from a second saturation magnetization section. An opto-magnetic disk is also provided having recording areas including at least one of first and second magnetization saturation levels arranged in the front of the unit recording areas.

摘要翻译： 光盘单元被构造成能够检测存在于单元记录区域的前方的预定区域。 此外，第一和第二饱和磁化中的至少一个被记录在每个检测到的预定区域上。 在再现时，在对应于预定区域的一个部分的拾取器的输出的一部分被钳位到预定水平之后，对拾取器的输出进行信号处理。 另外在再现时，可以基于从第一饱和磁化部分读取的信号和从第二饱和磁化部分读取的信号之间的电平差来执行用于对拾取器的输出进行信号处理的电路的增益控制。 还提供了具有包括布置在单元记录区域的前面的第一和第二磁化饱和度水平中的至少一个的记录区域的光磁盘。

公开(公告)号：US5007712A

公开(公告)日：1991-04-16

申请号：US234547

申请日：1988-08-22

申请人： Ikuya Kikuchi ,  Ryo Sato

发明人： Ikuya Kikuchi ,  Ryo Sato

IPC分类号： G11B7/085 ,  G11B7/09

CPC分类号： G11B7/08582 ,  G11B7/0932

摘要： In an optical pick-up unit, there is provided with a structure for supporting a holder holding at least an objective lens through a spring support assembly so that said holder is movable in both of a focusing direction and a tracking direction, carried on a carriage capable of traveling at a high speed in the tracking direction, a spring constant of the spring support assembly is so set as to be larger in the tracking direction than in the focusing direction, whereby an amount of a positioning error of the objective lens produced in the tracking direction when the carriage is driven at a high speed is reduced. As a result, by the thus reduced amount of the positioning error of the objective lens, the optical pick-up unit is improved in access time in comparison with the conventional optical pick-up unit.

摘要翻译： 在光学拾取单元中，设置有用于支撑通过弹簧支撑组件保持至少物镜的保持器的结构，使得所述保持器可以在聚焦方向和跟踪方向上移动，承载在托架 能够沿跟踪方向高速行进，弹簧支承组件的弹簧常数在跟踪方向上比聚焦方向大，由此产生的物镜的定位误差量 当滑架以高速驱动时的跟踪方向减小。 结果，与传统的光学拾取单元相比，由于物镜的定位误差量的减少，光拾取单元的存取时间得以改善。