公开(公告)号：US20080101199A1

公开(公告)日：2008-05-01

申请号：US11924225

申请日：2007-10-25

申请人： Fumitomo YAMASAKI ,  Kousei Sano ,  Yoshiaki Komma ,  Kanji Wakabayashi ,  Toshiyasu Tanaka

发明人： Fumitomo YAMASAKI ,  Kousei Sano ,  Yoshiaki Komma ,  Kanji Wakabayashi ,  Toshiyasu Tanaka

IPC分类号： G11B7/135

CPC分类号： G11B7/1275 ,  G11B7/0903 ,  G11B7/0906 ,  G11B7/0909 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0006

摘要： The present invention aims to provide an optical head and an optical disk device capable of suitably detecting tracking error signals for different types of optical discs.A polarizing hologram element includes a first area and a second area adjacent to the first area in an area where a beam reflected and diffracted by a BD passes. The first area includes a first transmission area for transmitting many 1st-order diffracted lights from the BD, a second transmission area adjacent to the first transmission area and closer to an optical axis than the first transmission area, and a third transmission area adjacent to the first and second transmission areas. The second area includes a fourth transmission area for transmitting many 1st-order diffracted lights from the BD, a fifth transmission area adjacent to the fourth transmission area and closer to the optical axis than the fourth transmission area, and a sixth transmission area adjacent to the fourth and fifth transmission areas.

摘要翻译： 本发明的目的在于提供一种能够适当地检测不同类型的光盘的跟踪误差信号的光头和光盘装置。 偏振全息元件包括在BD反射和衍射的光束通过的区域中与第一区域相邻的第一区域和第二区域。 第一区域包括用于从BD传输许多1个次衍射光的第一透射区域，与第一透射区域相邻并且比第一透射区域更靠近光轴的第二透射区域， 以及与第一和第二传输区域相邻的第三传输区域。 第二区域包括用于从BD传输许多1个级衍射光的第四传输区域，与第四传输区域相邻并且比第四传输区域更靠近光轴的第五传输区域， 以及与第四和第五传输区域相邻的第六传输区域。

公开(公告)号：US20080084798A1

公开(公告)日：2008-04-10

申请号：US11981366

申请日：2007-10-31

申请人： Shin-ichi Kadowaki ,  Kousei Sano ,  Akihiro Arai ,  Katsuhiko Yasuda ,  Tomotada Kamei ,  Hiroaki Yamamoto ,  Fumitomo Yamasaki

发明人： Shin-ichi Kadowaki ,  Kousei Sano ,  Akihiro Arai ,  Katsuhiko Yasuda ,  Tomotada Kamei ,  Hiroaki Yamamoto ,  Fumitomo Yamasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1381 ,  G11B7/0901 ,  G11B7/0903 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/0948 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/13927 ,  G11B2007/0013

摘要： An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a tracking error signal generator. An optical recording medium has tracks arranged substantially at a constant pitch. An average of a pitch is tp. When a main beam is placed on the track, a first sub-beam and a second sub-beam are placed between the tracks. The tracking error signal generator performs a differential arithmetic operation with respect to signals output from a light-receiving portion receiving the main beam to generate a first push-pull signal, performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal, and performs a differential arithmetic operation with respect to the first push-pull signal and the second push-pull signal to generate a tracking error signal, in a case where an amplitude of the first push-pull signal obtained at the pitch tp is fluctuated when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium.

公开(公告)号：US07283435B2

公开(公告)日：2007-10-16

申请号：US10481206

申请日：2002-07-04

申请人： Yuuichi Kuze ,  Kenji Fujiune ,  Takashi Kishimoto ,  Shin-ichi Yamada ,  Katsuya Watanabe ,  Akihiro Yasuda ,  Shin-ichi Kadowaki ,  Kousei Sano

发明人： Yuuichi Kuze ,  Kenji Fujiune ,  Takashi Kishimoto ,  Shin-ichi Yamada ,  Katsuya Watanabe ,  Akihiro Yasuda ,  Shin-ichi Kadowaki ,  Kousei Sano

IPC分类号： G11B7/00

CPC分类号： G11B7/1378 ,  G11B7/08511 ,  G11B7/0908 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/0948 ,  G11B7/131 ,  G11B7/1369 ,  G11B7/1381 ,  G11B7/13927 ,  G11B2007/0006 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical disc device of the present invention includes spherical aberration changing means for changing spherical aberration occurring on a converging position of a light beam converged by a lens, an actuator for moving the spherical aberration changing means in a relatively precise manner, and an actuator for moving the spherical aberration changing means in a relatively rough manner. The optical disc device drives a second actuator and a third actuator based on a signal of spherical aberration detecting means and performs control so that spherical aberration is almost 0. The third actuator moves the spherical aberration changing means based on a direct current component included in a signal of the spherical aberration detecting means, and the second actuator moves the spherical aberration changing means based on an alternating current component included in the signal of the spherical aberration detecting means.

摘要翻译： 本发明的光盘装置包括球面像差改变装置，用于改变在由透镜会聚的光束的会聚位置处产生的球面像差，用于相对精确地移动球面像差改变装置的致动器和用于 以相对粗糙的方式移动球面像差改变装置。 光盘装置基于球面像差检测装置的信号驱动第二致动器和第三致动器，并执行控制，使得球面像差几乎为0.第三致动器基于包括在球面像差检测装置中的直流分量来移动球面像差改变装置 信号，并且第二致动器基于球面像差检测装置的信号中包括的交流分量来移动球面像差改变装置。

公开(公告)号：US07277365B2

公开(公告)日：2007-10-02

申请号：US10289685

申请日：2002-11-06

申请人： Akihiro Yasuda ,  Shin-ichi Kadowaki ,  Kousei Sano ,  Yuuichi Kuze

发明人： Akihiro Yasuda ,  Shin-ichi Kadowaki ,  Kousei Sano ,  Yuuichi Kuze

IPC分类号： G11B7/095

CPC分类号： G11B7/0943 ,  G11B7/0908 ,  G11B7/094 ,  G11B7/0945 ,  G11B7/1369 ,  G11B7/1392 ,  G11B7/13925

摘要： An optical information processing apparatus includes: an optical head for irradiating an optical information recording medium with light, converting the light reflected by the optical information recording medium into a head signal and outputting the head signal; a signal quality index detector for detecting a signal quality index representing quality of the head signal on the basis of the head signal; and a two-dimensional probe for varying the focal position and the spherical aberration of the light radiated onto the optical information recording medium so as to search for a focal position and a spherical aberration that optimize the signal quality index detected by the signal quality index detector.

摘要翻译： 光学信息处理设备包括：光头，用于用光照射光信息记录介质，将由光信息记录介质反射的光转换成头信号并输出​​头信号; 信号质量指标检测器，用于根据头信号检测表示头信号质量的信号质量指标; 以及用于改变照射到光学信息记录介质上的光的焦点位置和球面像差的二维探头，以便搜索优化由信号质量指标检测器检测到的信号质量指数的焦点位置和球面像差 。

公开(公告)号：US20070195664A1

公开(公告)日：2007-08-23

申请号：US11789106

申请日：2007-04-23

申请人： Shin-ichi Kadowaki ,  Kousei Sano ,  Akihiro Arai ,  Katsuhiko Yasuda ,  Tomotada Kamei ,  Hiroaki Yamamoto ,  Fumitomo Yamasaki

发明人： Shin-ichi Kadowaki ,  Kousei Sano ,  Akihiro Arai ,  Katsuhiko Yasuda ,  Tomotada Kamei ,  Hiroaki Yamamoto ,  Fumitomo Yamasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1381 ,  G11B7/0901 ,  G11B7/0903 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/0948 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/13927 ,  G11B2007/0013

摘要： An optical information apparatus of the present invention includes: an optical pick-up head including: a light source; a diffraction unit; a condensing unit; a beam splitter; a photodetector; and a tracking error signal generator. An optical recording medium has tracks arranged substantially at a constant pitch. An average of a pitch is tp. When a main beam is placed on the track, a first sub-beam and a second sub-beam are placed between the tracks. The tracking error signal generator performs a differential arithmetic operation with respect to signals output from a light-receiving portion receiving the main beam to generate a first push-pull signal, performs a differential arithmetic operation with respect to signals output from the light-receiving portions receiving the first sub-beam and the second sub-beam to generate a second push-pull signal, and performs a differential arithmetic operation with respect to the first push-pull signal and the second push-pull signal to generate a tracking error signal, in a case where an amplitude of the first push-pull signal obtained at the pitch tp is fluctuated when the light beam is scanned in a direction orthogonal to the tracks of the optical recording medium.

公开(公告)号：US07203138B2

公开(公告)日：2007-04-10

申请号：US10691317

申请日：2003-10-22

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

IPC分类号： G11B7/00

CPC分类号： G11B7/131 ,  G11B7/0943 ,  G11B7/0953 ,  G11B7/0956 ,  G11B7/1353 ,  G11B2007/13727

摘要： An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including tracks having prescribed grooves; a light detector having a plurality of detection areas for receiving the light reflected by the information memory medium and outputting a signal in accordance with a light amount of the light received; a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals; and a light division element for dividing a reflected light reflected by the information memory medium. A relationship λ/(NA·Tp)≧1 is satisfied where λ is the wavelength of the light emitted from the light source, NA is the numerical aperture of the collection optical system, and Tp is the distance from a center of the track in the information memory medium to a center of the adjacent track; and the tracking error signal generator generates a tracking error signal from an area except for an overlapping area of the reflected light, the overlapping area being an area of overlapping two circles each having a radius of 1 and having a center of one circle being apart from a center of the reflected light beam at a distance of λ/(NA·2Tp) in a direction orthogonal to the track from a center of a cross-section of the reflected light, when the cross-section of the reflected light on the light division element in a circle having a radius of 1.

摘要翻译： 光头装置包括用于发光的光源; 收集光学系统，用于将由光源发射的光收集到包括具有规定凹槽的轨道的信息存储介质; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光并根据所接收的光的光量输出信号; 跟踪误差信号发生器，用于接收从光检测器输出的信号并基于该信号产生跟踪误差信号; 以及用于分割由信息存储介质反射的反射光的光分离元件。 满足λ/（NA.Tp）> = 1的关系，其中λ是从光源发射的光的波长，NA是收集光学系统的数值孔径，Tp是从轨道的中心的距离 在信息存储介质中到相邻轨道的中心; 并且跟踪误差信号发生器从除了反射光的重叠区域之外的区域产生跟踪误差信号，重叠区域是具有半径为1并且具有一个圆的中心的两个圆的重叠区域 在反射光的横截面的中心处，在与轨道正交的方向上的距离λ/（NA.2Tp）处的反射光束的中心，当反射光的横截面 半径为1的圆的分割元素。

公开(公告)号：US07088513B2

公开(公告)日：2006-08-08

申请号：US10823673

申请日：2004-04-14

申请人： Toshiyasu Tanaka ,  Yoshiaki Komma ,  Kousei Sano

发明人： Toshiyasu Tanaka ,  Yoshiaki Komma ,  Kousei Sano

IPC分类号： G02B5/18

CPC分类号： G11B7/1275 ,  G02B5/1866 ,  G02B5/32 ,  G03H2240/15 ,  G11B7/1353 ,  G11B2007/0006

摘要： A diffraction element includes a light-transmittable member and a diffraction grating formed on at least one face of the light-transmittable member. When a first laser beam having a first wavelength λ1 and a second laser beam having a second wavelength λ2 are transmitted through the diffraction element at first and second diffraction efficiencies, respectively, the diffraction element functions to equalize the first and second diffraction efficiencies to each other by only the one face of the diffraction element. The diffraction grating has a first phase modulation amount ø1 for the first laser beam and a second phase modulation amount ø2 for the second laser beam and the first and second phase modulation amounts ø1 and ø2 are, respectively, approximate to (2πN1±Δø) and (2πN2±Δø) in which “N1” and “N2” are natural numbers and “Δø” is a phase variation amount.

摘要翻译： 衍射元件包括形成在可透光部件的至少一个面上的透光部件和衍射光栅。 当具有第一波长λ1的第一激光束和具有第二波长λ2的第二激光束分别以第一和第二衍射效率透射穿过衍射元件时，衍射元件用于相互之间的第一和第二衍射效率相等 只有衍射元件的一面。 衍射光栅具有第一激光束的第一相位调制量ø1和第二激光束的第二相位调制量ø2，第一和第二相位调制量ø1和ø2分别接近（2piN1±Δω）和 （2piN2±Δφ），其中“N1”和“N2”是自然数，“Deltaø”是相位变化量。

公开(公告)号：US07065013B2

公开(公告)日：2006-06-20

申请号：US11173628

申请日：2005-07-01

申请人： Katsuhiko Yasuda ,  Kousei Sano ,  Daisuke Ogata ,  Yuuichi Kuze

发明人： Katsuhiko Yasuda ,  Kousei Sano ,  Daisuke Ogata ,  Yuuichi Kuze

IPC分类号： G11B7/00

CPC分类号： G11B7/1369 ,  G11B7/13925 ,  G11B2007/0006 ,  G11B2007/0013

摘要： The quantity of spherical aberration correction is predetermined for each recording plane of an optical disk on which focusing control is performed. Before operating the focusing control, the quantity of spherical aberration to be corrected by an aberration correcting system is set based on an output signal from an aberration correction quantity switching device that corresponds to the type of the optical disk and the recording plane to be subjected to the focusing control. This makes it possible to perform stable focusing control on each recording plane of a multi-layer optical disk with high density by using an objecting lens having a large NA after spherical aberration has been corrected properly.

公开(公告)号：US06741416B2

公开(公告)日：2004-05-25

申请号：US09736798

申请日：2000-12-14

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hajime Hatada ,  Ikuo Ohmura

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hajime Hatada ,  Ikuo Ohmura

IPC分类号： G11B5596

CPC分类号： G11B5/5526 ,  G11B5/59677

摘要： A device and a method are provided in which stable tracking control can be carried out even in an arbitrary phase by optically reading pits provided in a disk when information is recorded on and reproduced from the disk with a magnetic head. With respect to difference signals obtained from a main beam signal and sub-beam signals obtained through three-beam type photodetectors, gain correction is executed in variable gain amplifiers, respectively, so that output signals therefrom have same amplitude levels and are different in phase by 90 degrees in a track crossing direction, and thus a tracking error signal is generated by being synthesized from the output signals. Based on the tracking error signal, tracking control is carried out.

摘要翻译： 提供了一种装置和方法，其中即使在磁盘上记录信息并从磁盘再现的情况下，即使在任意阶段也可以通过光学读取设置在盘中的凹坑来进行稳定的跟踪控制。 对于从主波束信号和通过三光束型光电检测器获得的子波束信号获得的差分信号，分别在可变增益放大器中执行增益校正，使得其输出信号具有相同的幅度电平并且在相位上不同 通过从输出信号合成，产生轨迹交叉方向90度的跟踪误差信号。 基于跟踪误差信号，进行跟踪控制。

公开(公告)号：US06665257B2

公开(公告)日：2003-12-16

申请号：US09761072

申请日：2001-01-15

申请人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

发明人： Kousei Sano ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Seiji Nishino

IPC分类号： G11B700

CPC分类号： G11B7/0943 ,  G11B7/0953 ,  G11B7/0956 ,  G11B7/131 ,  G11B7/1381

摘要： An optical head device includes a light source for emitting light; a collection optical system for collecting the light emitted by the light source to an information memory medium including at least one of a track having a mark or a space selectively arranged, and a track having a prescribed groove; a light detector having a plurality of detection areas for receiving the light reflected by the information memory medium and outputting a signal in accordance with a light amount of the light received; a division element for dividing the light reflected by the information memory medium and allowing the light to be received by the light detector; a switch element for receiving a first signal and a second signal, which are respectively obtained in accordance with the reflected light incident on a first prescribed area and a second prescribed area of the division element and outputting either one of the first signal or the second signal, the first and second prescribed areas being obtained by dividing the division element along at least one division line; and an information reproduction signal generator for receiving the signal output by the switch element and generating information recorded on the track. The switch element outputs either one of the first signal and the second signal in accordance with a distance and e positional relationship between a light collection point of the light output from the collection light system and the track.

摘要翻译： 光头装置包括用于发光的光源; 收集光学系统，用于将由光源发射的光收集到信息存储介质中，所述信息存储介质包括具有选择性排列的标记或空间的轨道和具有规定槽的轨道中的至少一个; 具有多个检测区域的光检测器，用于接收由信息存储介质反射的光并根据所接收的光的光量输出信号; 分割元件，用于分割由信息存储介质反射的光并允许光被光检测器接收; 用于接收第一信号和第二信号的开关元件，它们分别根据入射在分割元件的第一规定区域和第二规定区域上的反射光获得并输出第一信号或第二信号 所述第一规定区域和所述第二规定区域通过沿着至少一个分割线划分所述分割单元而获得; 以及信息再现信号发生器，用于接收由开关元件输出的信号并产生记录在轨道上的信息。 开关元件根据从收集光系统输出的光的光收集点与轨道之间的距离和e位置关系，输出第一信号和第二信号中的任一个。