公开(公告)号：US08023368B2

公开(公告)日：2011-09-20

申请号：US10963851

申请日：2004-10-13

申请人： Akihiro Arai

发明人： Akihiro Arai

IPC分类号： G11B7/095 ,  G11B7/135

CPC分类号： G11B7/1381 ,  G11B7/007 ,  G11B7/09 ,  G11B7/0956 ,  G11B7/131 ,  G11B7/1353

摘要： A tilt sensor includes a photodetector having a photosensitive plane and detecting a light beam in multiple areas and outputting detection signals representing its intensities and a tilt detector for generating a tilt error signal, including information about the tilt of a disk, based on the detection signals. The light beam forms a beam spot on the photosensitive plane. The beam spot includes a +first-order light area in which zero-order and +first-order light rays, diffracted by a track on the disk, are superposed, −first-order light area in which zero-order and −first-order light rays are superposed, and a zero-order light area which is sandwiched between the +first-order and −first-order light areas, includes neither the +first-order nor −first-order light ray, but includes a zero-order light ray. The photodetector generates the detection signals except for light entering an opaque area provided for at least part of the zero-order light area.

摘要翻译： 倾斜传感器包括具有感光平面的光电检测器，并且检测多个区域中的光束并输出表示其强度的检测信号，以及倾斜检测器，用于基于检测信号产生包括关于盘的倾斜的信息的倾斜误差信号 。 光束在感光平面上形成束斑。 光束点包括+一级光区域，其中由盘上的轨道衍射的零级和+一级光线叠加在一级光区域中，其中零级和第一级光区域被零叠加， 叠加了一级光线，并且夹在+一阶和一级光区域之间的零级光区域既不包含+一阶也不是一级光线，而是包括零 - 订购光线。 光检测器产生检测信号，除了光进入为零级光区域的至少一部分提供的不透明区域。

公开(公告)号：US07965612B2

公开(公告)日：2011-06-21

申请号：US12641734

申请日：2009-12-18

申请人： Eishin Mori ,  Akihiro Arai ,  Fumitomo Yamasaki ,  Joji Anzai

发明人： Eishin Mori ,  Akihiro Arai ,  Fumitomo Yamasaki ,  Joji Anzai

IPC分类号： G11B7/135 ,  G11B7/00 ,  G11B7/20

CPC分类号： G11B7/1374 ,  G11B7/1376 ,  G11B7/139 ,  G11B7/13925 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical head that is restrained from becoming larger, even if it is used for an optical-information recording medium that includes a plurality of information recording layers. In this optical head, a collimating lens is formed by a concave lens disposed on the side of a light source and a convex lens disposed on the side of an objective lens. A collimating-lens actuator moves the convex lens in a direction where a spherical aberration is cancelled which is generated according to the thickness of a light transmission layer up to an information recording layer of the optical-information recording medium. An aperture stop is provided on the side of the collimating lens with respect to the objective lens, and the aperture stop is located near the focal position of the convex lens on the side of the objective lens.

摘要翻译： 即使将其用于包含多个信息记录层的光学信息记录介质，也被抑制得越来越大。 在该光学头中，准直透镜由设置在光源侧的凹透镜和设置在物镜侧的凸透镜形成。 准直透镜致动器沿着光传输层的厚度直到光信息记录介质的信息记录层产生的球面像差被消除的方向移动凸透镜。 在准直透镜相对于物镜的一侧设置孔径光阑，孔径光阑位于物镜侧的凸透镜的焦点附近。

公开(公告)号：US07911890B2

公开(公告)日：2011-03-22

申请号：US12066869

申请日：2006-09-13

申请人： Akihiro Arai ,  Takeharu Yamamoto

发明人： Akihiro Arai ,  Takeharu Yamamoto

IPC分类号： G11B7/00

CPC分类号： G11B7/0912

摘要： An optical disc drive includes: an optical branching element for splitting light from a light source into main and sub-beams; a condenser element for condensing the main and sub-beams; a photodetector section including photodetectors to receive reflected portions of the main and sub-beams, each photodetector having photosensitive areas, each of which outputs a signal representing the intensity of light received there; and a computing section for generating a first focus signal, representing where the focal point of the main beam is located with respect to the storage layer, based on the reflected light of the main beam, and a second focus signal based on the reflected light of the main and sub-beams.

摘要翻译： 光盘驱动器包括：光分路元件，用于将来自光源的光分成主光束和子光束; 用于冷凝主光束和副光束的聚光元件; 光电检测器部分包括用于接收主光束和副光束的反射部分的光电检测器，每个光电检测器具有感光区域，每个光电检测器输出表示在那里接收的光的强度的信号; 以及计算部分，用于基于主光束的反射光产生表示主光束的焦点相对于存储层位于何处的第一聚焦信号，以及基于主光束的反射光的第二聚焦信号 主梁和副梁。

公开(公告)号：US20100091636A1

公开(公告)日：2010-04-15

申请号：US12641734

申请日：2009-12-18

申请人： Eishin Mori ,  Akihiro Arai ,  Fumitomo Yamasaki ,  Joji Anzai

发明人： Eishin Mori ,  Akihiro Arai ,  Fumitomo Yamasaki ,  Joji Anzai

IPC分类号： G11B7/00

CPC分类号： G11B7/1374 ,  G11B7/1376 ,  G11B7/139 ,  G11B7/13925 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical head that is restrained from becoming larger, even if it is used for an optical-information recording medium that includes a plurality of information recording layers. In this optical head, a collimating lens is formed by a concave lens disposed on the side of a light source and a convex lens disposed on the side of an objective lens. A collimating-lens actuator moves the convex lens in a direction where a spherical aberration is cancelled which is generated according to the thickness of a light transmission layer up to an information recording layer of the optical-information recording medium. An aperture stop is provided on the side of the collimating lens with respect to the objective lens, and the aperture stop is located near the focal position of the convex lens on the side of the objective lens.

摘要翻译： 即使将其用于包含多个信息记录层的光学信息记录介质，也被抑制得越来越大。 在该光学头中，准直透镜由设置在光源侧的凹透镜和设置在物镜侧的凸透镜形成。 准直透镜致动器沿着光传输层的厚度直到光信息记录介质的信息记录层产生的球面像差被消除的方向移动凸透镜。 在准直透镜相对于物镜的一侧设置孔径光阑，孔径光阑位于物镜侧的凸透镜的焦点附近。

公开(公告)号：US07558170B2

公开(公告)日：2009-07-07

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.

摘要翻译： 本发明的光信息装置包括：光拾取头，包括：光源; 衍射单位; 冷凝单元; 分束器; 光检测器; 和跟踪误差信号发生器。 光记录介质具有基本上以恒定间距布置的轨道。 平均音高是tp。 当主光束被放置在轨道上时，第一子光束和第二子光束被放置在轨道之间。 跟踪误差信号发生器对从接收主波束的光接收部分输出的信号执行差分运算，产生第一推挽信号，对从光接收部分输出的信号执行差分运算 接收第一子光束和第二子光束以产生第二推挽信号，并且相对于第一推挽信号和第二推挽信号执行差分算术运算以产生跟踪误差信号， 当在与光记录介质的轨道正交的方向上扫描光束时，以间距tp获得的第一推挽信号的幅度波动的情况。

公开(公告)号：US07542382B2

公开(公告)日：2009-06-02

申请号：US11981236

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：US07463561B2

公开(公告)日：2008-12-09

申请号：US11789078

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：US20080062825A1

公开(公告)日：2008-03-13

申请号：US11898035

申请日：2007-09-07

申请人： Akihiro Arai ,  Yoshiaki Komma

发明人： Akihiro Arai ,  Yoshiaki Komma

IPC分类号： G11B7/00

CPC分类号： G11B7/0903 ,  G11B7/00718 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/24079 ,  G11B2007/0006

摘要： The present invention aims to provide an optical head including a diffraction element capable of improving the quality of a TE signal by a DPP method even if light amounts of two sub-spots are unbalanced for optical discs having different groove pitches.In a three-beam optical head, a diffraction element 12 is divided in a radial direction of an optical disc into a first area 31, a second area 32 and a third area 33, wherein the second area 32 is further divided into a fourth area 321 and a fifth area 322. The periodic structure of the first area 31 is displaced from that of the fourth area 321 by a ¼ period, the periodic structure of the third area 32 is displaced from that of the first area 31 by a ½ period, and the periodic structure of the fifth area 322 is displaced from that of the third area 33 by a ¼ period and from that of the fourth area 321 by a ½ period.

摘要翻译： 本发明的目的在于提供一种光头，其包括能够通过DPP方式提高TE信号的质量的衍射元件，即使对于具有不同凹槽间距的光盘，两个子点的光量不平衡。 在三光束光头中，将衍射元件12沿光盘的径向划分为第一区域31，第二区域32和第三区域33，其中第二区域32进一步被划分成第四区域 321和第五区域322。 第一区域31的周期性结构与第四区域321的周期性结构相差1/4周期，第三区域32的周期性结构与第一区域31的周期性结构偏移1/2周期，并且周期性结构 第五区域322从第三区域33的位置移位1/4周期，从第四区域321的位置移位1/2周期。

公开(公告)号：US20070237040A1

公开(公告)日：2007-10-11

申请号：US11810077

申请日：2007-06-04

申请人： Fumitomo Yamasaki ,  Akihiro Arai

发明人： Fumitomo Yamasaki ,  Akihiro Arai

IPC分类号： G11B7/00

CPC分类号： G11B7/1392 ,  G11B7/0901 ,  G11B7/0908 ,  G11B7/0956 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1381

摘要： An optical head comprising a light source, an objective lens, a light splitting means, a light receiving element, a tracking error signal detection means, and a spherical aberration detection means, wherein the light splitting means has six regions that are divided by a first splitting line that is substantially parallel to a longitudinal direction of an information tracks, and by second and third splitting lines perpendicular to the first splitting line. The spherical aberration detection means compares a first focal point shift amount obtained by detecting the size of a light spot formed by focusing the light fluxes created by laser light passing through two regions that are disposed between the second and third splitting lines, onto the light receiving element, and a second focal point shift amount obtained by detecting the size of a light spot formed by focusing the light fluxes created by laser light passing through the four regions, which are disposed on the outer side of the second and third splitting lines, to generate a spherical aberration error signal for detecting the spherical aberration generated at the objective lens.

摘要翻译： 一种光头，包括光源，物镜，分光装置，光接收元件，跟踪误差信号检测装置和球面像差检测装置，其中分光装置具有六个区域，其被第一 基本上平行于信息轨迹的纵向的分割线，以及垂直于第一分割线的第二和第三分割线。 球面像差检测装置将通过将通过设置在第二和第三分割线之间的两个区域的激光产生的光束聚焦而形成的光斑的大小获得的第一焦点偏移量进行比较， 以及第二焦点偏移量，其通过将通过将穿过设置在第二和第三分割线的外侧上的四个区域的激光产生的光束聚焦形成的光斑的大小， 产生用于检测在物镜处产生的球面像差的球面像差误差信号。

公开(公告)号：US07227819B2

公开(公告)日：2007-06-05

申请号：US10646602

申请日：2003-08-22

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.

摘要翻译： 本发明的光信息装置包括：光拾取头，包括：光源; 衍射单位; 冷凝单元; 分束器; 光检测器; 和跟踪误差信号发生器。 光记录介质具有基本上以恒定间距布置的轨道。 平均音高是tp。 当主光束被放置在轨道上时，第一子光束和第二子光束被放置在轨道之间。 跟踪误差信号发生器对从接收主波束的光接收部分输出的信号执行差分运算，产生第一推挽信号，对从光接收部分输出的信号执行差分运算 接收第一子光束和第二子光束以产生第二推挽信号，并且相对于第一推挽信号和第二推挽信号执行差分算术运算以产生跟踪误差信号， 当在与光记录介质的轨道正交的方向上扫描光束时，以间距tp获得的第一推挽信号的幅度波动的情况。