公开(公告)号：US20090138901A1

公开(公告)日：2009-05-28

申请号：US12280812

申请日：2007-02-27

申请人： Toshiyasu Tanaka ,  Yoshiaki Komma ,  Kousei Sano ,  Hidenori Wada ,  Keiichi Matzuzaki ,  Kanji Wakabayashi

发明人： Toshiyasu Tanaka ,  Yoshiaki Komma ,  Kousei Sano ,  Hidenori Wada ,  Keiichi Matzuzaki ,  Kanji Wakabayashi

IPC分类号： G11B7/135 ,  G11B7/00 ,  G01C21/00 ,  G09G5/00

CPC分类号： G11B7/1398 ,  G11B7/1392

摘要： An optical pickup includes: a laser light source which outputs an divergent beam having an elliptical far-field pattern; a beam shaping element having at least one cylindrical plane and which shapes the divergent beam outputted from the laser light source into an divergent beam having a prescribed shape in which at least the length in the major axis direction of the elliptical shape is shortened; a light collecting portion having a beam splitter which perpendicularly collects the divergent beam that is outputted from the beam shaping element and which has a prescribed shape on the recording surface of an optical disk, and a mirror or the like; and a light detecting portion The optical axis of the divergent beam is rotated so that the direction in which the major axis of the divergent beam having a prescribed shape is shortened conforms to the radial direction of an optical information recording medium.

摘要翻译： 光学拾取器包括：激光源，其输出具有椭圆形远场图案的发散光束; 具有至少一个圆柱面并且将从激光光源输出的发散光束成形为具有规定形状的发散光束的光束成形元件，其中至少椭圆形长轴方向上的长度被缩短; 具有分束器的光收集部分，其垂直地收集从光束成形元件输出并且在光盘的记录表面上具有规定形状的发散光束和反射镜等; 和光检测部分发散光束的光轴旋转，使得具有规定形状的发散光束的长轴的方向被缩短，符合光学信息记录介质的径向。

公开(公告)号：US20090086330A1

公开(公告)日：2009-04-02

申请号：US12280601

申请日：2007-01-23

申请人： Keiichi Matsuzaki ,  Yoshiaki Komma ,  Toshiyasu Tanaka ,  Kousei Sano ,  Kanji Wakabayashi ,  Hidenori Wada

发明人： Keiichi Matsuzaki ,  Yoshiaki Komma ,  Toshiyasu Tanaka ,  Kousei Sano ,  Kanji Wakabayashi ,  Hidenori Wada

IPC分类号： G02B13/18

CPC分类号： G11B7/1353 ,  G11B7/1362 ,  G11B7/1376 ,  G11B7/13925 ,  G11B2007/0013

摘要： A small optical pickup of wide spherical aberration correction range is provided. The optical pickup includes a rising mirror for deflecting a light beam at substantially right angle and guiding to an entrance surface of the objective lens; a spherical aberration correction lens having one surface formed to a larger curvature than the other surface; a lens holder for holding the spherical aberration correction lens so that the surface of large curvature partially projects out towards the rising mirror side; a guide member extending in an optical axis direction of the spherical aberration correction lens sand having an end arranged to the side of a reflecting surface of the rising mirror; and a slidable part slidable along the guide member; wherein the projecting portion of the slidable part is configured to be fitted within the side surface of the reflecting surface of the rising mirror, and the projecting portion from the lens holder of the spherical aberration correction lens overlaps the reflecting surface of the rising mirror when the spherical aberration correction lens approaches the rising mirror the most.

摘要翻译： 提供宽球面像差校正范围的小型光学拾取器。 光学拾取器包括用于使光束以基本上直角偏转并引导到物镜的入射表面的上升反射镜; 球面像差校正透镜，其一个表面形成为比另一个表面大的曲率; 用于保持球面像差校正透镜的透镜保持器，使得大曲率的表面部分地向上升反射镜侧突出; 引导构件，其沿球面像差校正透镜砂的光轴方向延伸，所述球面像差校正透镜砂的端部设置在所述上​​升反射镜的反射面的一侧; 以及可沿着引导构件滑动的滑动部件; 其中，所述可滑动部分的突出部分被配置成装配在所述反射镜的反射表面的侧表面内，并且当所述球面像差校正透镜的透镜保持器的突出部分与所述上升反射镜的反射表面重叠时， 球面像差校正镜最接近上升镜。

公开(公告)号：US07486606B2

公开(公告)日：2009-02-03

申请号：US11151272

申请日：2005-06-14

申请人： Kousei Sano ,  Yoshiaki Komma ,  Sadao Mizuno

发明人： Kousei Sano ,  Yoshiaki Komma ,  Sadao Mizuno

IPC分类号： G11B7/00

CPC分类号： G11B7/1353

摘要： An optical head which is capable of realizing a stable tracking control, even if the rotational center of an information recording medium is not located on the extension line of the transfer directions of a light-concentrating element, includes: a semiconductor laser which emits a beam of light; an objective lens which concentrates the beam of light on an optical disk; a transfer mechanism which transfers the objective lens between the outermost circumference and the innermost circumference of the recording area of the optical disk along the optical disk; and a photo-detector which detects a beam of light that returns from the optical disk. The photo-detector includes a plurality of areas which are divided by a division line. The division line is set parallel to the tangential directions of the track in a predetermined position on the transfer line of the objective lens between the outermost circumference and the innermost circumference of the recording area, and the plurality of areas are divided, by a lateral division line which intersects the division line, into a first area on which a beam of light that mainly includes a tracking component is incident and a second area on which a beam of light that does not include the tracking component is incident.

摘要翻译： 即使信息记录介质的旋转中心不位于聚光元件的传送方向的延长线上，也能够实现稳定的跟踪控制的光学头包括：发射光束的半导体激光器 的光 将光束聚集在光盘上的物镜; 传送机构，其沿着光盘在光盘的记录区域的最外圆周和最内圆周之间传送物镜; 以及光检测器，其检测从光盘返回的光束。 光检测器包括由划分线划分的多个区域。 分割线与记录区域的最外圆周和最内圆周之间的物镜的传送线上的预定位置处的轨道的切线方向平行设置，并且通过横向划分来划分多个区域 与分割线相交的第一区域进入主要包括跟踪分量的光束入射的第一区域和不包括跟踪组件的光束入射的第二区域。

公开(公告)号：US20080084797A1

公开(公告)日：2008-04-10

申请号：US11905923

申请日：2007-10-05

申请人： Kousei Sano ,  Takayuki Nagata ,  Hideki Aikoh ,  Joji Anzai ,  Fumitomo Yamasaki

发明人： Kousei Sano ,  Takayuki Nagata ,  Hideki Aikoh ,  Joji Anzai ,  Fumitomo Yamasaki

IPC分类号： G11B7/00

CPC分类号： G11B7/1381 ,  G11B7/0901 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0013

摘要： The present invention aims to generate an offset-free tracking signal and to realize a stable tracking control even if an optical disc is a multi-layer disc having three or more layers.Light receiving portions of a main region light receiving portion group is arranged between a projection line of a third dividing line on a photodetector and a projection line of a fourth dividing line on the photodetector by stray lights from information layers adjacent to the one, on which a light beam is focused, out of a plurality of information layers. Further, light receiving portions of a subregion light receiving portion group is arranged between a projection line of a first dividing line on a photodetector and a projection line of a second dividing line on the photodetector by the stray lights from the information layers adjacent to the one, on which a light beam is focused, out of the plurality of information layers.

摘要翻译： 本发明的目标是产生无偏移跟踪信号，并且即使光盘是具有三层或更多层的多层盘也能实现稳定的跟踪控制。 主区域光接收部分组的光接收部分布置在光电检测器上的第三分割线的投影线和光电检测器上的第四分割线的投影线之间，与来自与其相邻的信息层的杂散光 在多个信息层中聚焦光束。 此外，子区域光接收部分组的光接收部分被布置在光电检测器上的第一分割线的投影线和光电检测器上的第二分割线的投影线之间， 在多个信息层中聚焦光束。

公开(公告)号：US20050237900A1

公开(公告)日：2005-10-27

申请号：US10511867

申请日：2003-04-18

申请人： Kousei Sano ,  Yoshiaki Komma ,  Hidenori Wada ,  Akihiro Yasuda

发明人： Kousei Sano ,  Yoshiaki Komma ,  Hidenori Wada ,  Akihiro Yasuda

IPC分类号： G11B7/1353 ,  G02B5/18 ,  G02B5/32 ,  G11B7/00 ,  G11B7/085 ,  G11B7/135

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

摘要： The present invention provides a first light source (21) that emits light of a first wavelength, that at least either records onto or reproduces information from an information recording medium (30), a light source (22) that emits light of a second wavelength that records onto or reproduces information from an information recording medium (33), a light source (23) that emits light of a third wavelength that records onto or reproduces information from an information recording medium (23), focusing means, an optical element (28) that passes light of the first wavelength and diffracts light of the second and third wavelengths, wherein the optical element (28) is an optical element in which grooves are formed in a substrate, wherein the expression: 380 nm≦(n−1)×d≦420 nm is satisfied, where n is a refractive index of the substrate at a wavelength of 400 nm, and d (nm) is a depth per step of the grooves, and wherein the grooves are formed in two steps of depth d and depth 2d.

摘要翻译： 本发明提供了一种发射第一波长的光的第一光源（21），其至少从信息记录介质（30）记录信息或从信息记录介质再现信息，发射第二波长的光的光源（22） 从信息记录介质（33）记录信息或从信息记录介质（23）记录第三波长的光的光源（23），从信息记录介质（23），聚焦装置，光学元件（ 28），其通过第一波长的光并衍射第二和第三波长的光，其中光学元件（28）是其中在衬底中形成沟槽的光学元件，其中表达式： 描述=“在线公式”end =“lead”？> 380 nm <=（n-1）xd <= 420 nm <？in-line-formula description =“In-line Formulas”end =“tail”？ >，其中n是基底在波长处的折射率 400nm，并且d（nm）是凹槽的每个步骤的深度，并且其中凹槽以深度d和深度2d的两个步骤形成。

公开(公告)号：US20050117497A1

公开(公告)日：2005-06-02

申请号：US10504373

申请日：2003-01-30

申请人： Yoshiaki Komma ,  Sadao Mizuno ,  Kousei Sano

发明人： Yoshiaki Komma ,  Sadao Mizuno ,  Kousei Sano

IPC分类号： G11B7/00 ,  G11B7/125

CPC分类号： G11B7/1356 ,  G11B7/1275 ,  G11B7/1362 ,  G11B7/1365 ,  G11B7/1374 ,  G11B7/1378 ,  G11B7/1392 ,  G11B7/1395 ,  G11B2007/0006

摘要： Providing an objective lens with a large numerical aperture (NA), the present invention records or plays conventional optical disks such as CDs and DVDs using an optical head capable of recording or reproducing high-density optical disks. An optical element (8) is provided between a first and second laser light source and an objective lens (18) for the purpose of converting a wave front of a second optical beam 32. Furthermore, the optical element (8) and the objective lens (18) are fixed to move as a single piece.

摘要翻译： 提供具有大数值孔径（NA）的物镜，本发明使用能够记录或再现高密度光盘的光学头记录或播放诸如CD和DVD的常规光盘。 为了转换第二光束32的波前，光学元件（8）设置在第一和第二激光光源与物镜（18）之间。 此外，光学元件（8）和物镜（18）被固定成单件移动。

公开(公告)号：US06898169B2

公开(公告)日：2005-05-24

申请号：US10235625

申请日：2002-09-04

申请人： Shin-ichi Kadowaki ,  Yoshiaki Komma ,  Kousei Sano

发明人： Shin-ichi Kadowaki ,  Yoshiaki Komma ,  Kousei Sano

IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B7/0055 ,  G11B7/135

CPC分类号： G11B7/094 ,  G11B7/0055 ,  G11B7/0903 ,  G11B2007/0013

摘要： An optical pickup head device includes a diffraction grating for generating zero-order diffracted light and at least first-order diffracted light and provides a tracking error signal with a DPP method. The diffraction grating includes grating patterns with a nonuniform period or phase. The size of the first-order diffracted light converged on an optical recording medium is larger in the direction parallel to a tangent to the track than in the direction perpendicular to the tangent. P1/P0>PW2/PW1 is established, where PW1 represents the power that is required to record information on the optical recording medium, PW2 represents the maximum power that allows information recorded on the optical recording medium to be reproduced without being erased, P0 represents the light amount of the zero-order diffracted light converged on the optical recording medium, and P1 represents the light amount of the at least first-order diffracted light converged on the optical recording medium. This configuration makes it possible to detect a tracking error signal with reduced offset, even if a recordable optical recording medium having two information recording planes is used.

摘要翻译： 光拾取头装置包括用于产生零级衍射光和至少一级衍射光的衍射光栅，并提供具有DPP方法的跟踪误差信号。 衍射光栅包括具有不均匀周期或相位的光栅图案。 会聚在光学记录介质上的一级衍射光的尺寸在平行于轨道的切线的方向上大于在垂直于切线的方向上的尺寸。 P 1 / P 0> PW 2 / PW 1，其中PW 1表示在光学记录介质上记录信息所需的功率，PW 2表示允许记录在光学记录介质上的信息被再现的最大功率 不被擦除，P 0表示会聚在光记录介质上的零级衍射光的光量，P 1表示会聚在光记录介质上的至少一级衍射光的光量。 该配置使得即使使用具有两个信息记录平面的可记录光学记录介质，也可以检测具有减小的偏移的跟踪误差信号。

公开(公告)号：US06728192B1

公开(公告)日：2004-04-27

申请号：US09421025

申请日：1999-10-19

申请人： Shin-ichi Kadowaki ,  Shinichi Tanaka ,  Seiji Nishiwaki ,  Kousei Sano ,  Seiji Nishino

发明人： Shin-ichi Kadowaki ,  Shinichi Tanaka ,  Seiji Nishiwaki ,  Kousei Sano ,  Seiji Nishino

IPC分类号： G11B700

CPC分类号： G11B5/5556 ,  G11B5/016 ,  G11B5/5565 ,  G11B5/59677 ,  G11B7/0903 ,  G11B7/0941 ,  G11B21/10

摘要： In a magnetic recording medium to detect tracking error signals optically where an optical head and a magnetic head scan different tracks, two signals having phases different by &pgr;/2 are generated and added or subtracted. By changing the amplitude of the two signals with a changeable gain amplifying means, a phase of a tracking error signal is changed so that the servo operation is conducted at the middle of the amplitude of the tracking error signal to keep the magnetic head on track.

摘要翻译： 在用于检测光头和磁头扫描不同轨迹的光学跟踪误差信号的磁记录介质中，产生具有不同于π/ 2的相位的两个信号，并相加或相减。 通过用可变增益放大装置改变两个信号的振幅，改变跟踪误差信号的相位，使得伺服操作在跟踪误差信号的幅度的中间进行，以保持磁头跟踪。

公开(公告)号：US06661769B2

公开(公告)日：2003-12-09

申请号：US09964725

申请日：2001-09-28

申请人： Shin-ichi Kadowaki ,  Kousei Sano ,  Hiromichi Ishibashi ,  Shigeru Furumiya

发明人： Shin-ichi Kadowaki ,  Kousei Sano ,  Hiromichi Ishibashi ,  Shigeru Furumiya

IPC分类号： G11B700

CPC分类号： G11B7/0956 ,  G11B7/007 ,  G11B7/0938

摘要： Tilt of an optical storage medium is stably detected even when then the guide groove pitch is reduced and recording capacity is increased. On a disk with continuous grooves of a pitch Gp, part of tracks Gn−1 and Gn+1 adjacent to opposite sides of an n-th track Gn is eliminated, forming an area where the groove pitch is equivalent to 2·Gp. A push-pull signal from the area of groove pitch Gp and a push-pull signal from the area of groove pitch 2·Gp are differentiated to obtain a tilt error signal. Tilt can therefore be detected even when groove pitch Gp is reduced and storage capacity is increased, and a highly reliable data recording and reproducing apparatus can be provided at low cost.

公开(公告)号：US06418107B1

公开(公告)日：2002-07-09

申请号：US09641813

申请日：2000-08-17

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： G11B7/1381 ,  G11B7/0943 ,  G11B7/0953 ,  G11B7/0956 ,  G11B7/131

摘要： An optical head device includes a light source for emitting at least one of a coherent beam and a quasi-monochromatic beam; a collection optical system for collecting the beam to an information memory medium having a track which has at least one mark and at least one space; a light detector having a plurality of detection areas for receiving the beam reflected by the information memory medium and outputting a signal in accordance with a light amount of the beam received; and a tracking error signal generator for receiving the signals output from the light detector and generating a tracking error signal based on the signals. The tracking error signal generator reduces a difference between a first signal amplitude and a second signal amplitude. The first signal amplitude is an absolute value of a difference between first and second signal levels. The second signal amplitude is an absolute value of a difference between the first and third signal levels. The first signal level is a value of the tracking error signal obtained when the beam emitted by the light source is radiated to a center of the track. The second and third signal levels are, respectively, a maximum value and a minimum value of the tracking error signal obtained when the information memory medium is scanned by the beam emitted by the light source in a direction perpendicular to the track.

摘要翻译： 光头装置包括用于发射相干光束和准单色光束中的至少一个的光源; 收集光学系统，用于将光束收集到具有至少一个标记和至少一个空间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束并根据所接收的光束的光量输出信号; 以及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。 跟踪误差信号发生器减小第一信号幅度和第二信号幅度之间的差。 第一信号幅度是第一和第二信号电平之差的绝对值。 第二信号幅度是第一和第三信号电平之间的差的绝对值。 第一信号电平是当由光源发射的光束被辐射到轨道的中心时获得的跟踪误差信号的值。 第二和第三信号电平分别是当信息存储介质被光源在与光道垂直的方向上发射的光束扫描时获得的跟踪误差信号的最大值和最小值。