公开(公告)号：US07986607B2

公开(公告)日：2011-07-26

申请号：US12723777

申请日：2010-03-15

申请人： Jun-ichi Asada ,  Kazuo Momoo

发明人： Jun-ichi Asada ,  Kazuo Momoo

IPC分类号： G11B7/00

CPC分类号： G11B7/1367 ,  G11B7/1275 ,  G11B2007/0006

摘要： An optical pickup includes a wave plate on an optical path to be followed by every light beam emitted from three light sources (with wavelengths λ1, λ2 and λ3, respectively) both on their way toward an optical disc and back from the disc toward a photodetector. The wave plate has two layers with different retardations and different optic axis directions. The sum of the retardations of the first and second layers is defined to be approximately 5/4λ1, 3/4λ2 and 1/2λ3 to the light beams with the wavelengths λ1, λ2 and λ3.

摘要翻译： 光拾取器包括在光路上的波片，每个光束在三个光源（分别具有波长λ1，λ2和λ3）的两个光朝向光盘的方向发射，并且从光盘朝向光电检测器 。 波片具有不同延迟和不同光轴方向的两层。 第一层和第二层的延迟的总和被定义为具有波长λ1，λ2和λ3的光束的大约5 /4λ1,3/4λ2和1 /2λ3。

公开(公告)号：US20050226120A1

公开(公告)日：2005-10-13

申请号：US11100028

申请日：2005-04-06

申请人： Seiji Nishiwaki ,  Kazuo Momoo

发明人： Seiji Nishiwaki ,  Kazuo Momoo

IPC分类号： G03H1/04 ,  G03H1/22 ,  G11B7/00 ,  G11B7/0065 ,  G11B7/125

CPC分类号： G11B7/0065 ,  G03H2001/0415 ,  G03H2250/42 ,  G11B7/128

摘要： There is provided an information processing device which is capable of suppressing generation of stray light at the time of recording and reproduction of information, thus enabling quality information recording and reproduction. The information processing device includes: a radiation light source 2; and a converging section for converging rays emitted from the light source toward an information recording medium having a photosensitive layer 11b, wherein the converging section splits the rays into first and second rays 3′ and 3 respectively traveling through first and second spaces as divided by a plane at least containing a point optical axis L, and converges the first and second rays 3′ and 3 onto first and second points 12′ and 12 in the information recording medium 11, the photosensitive layer 11b being interposed between the first and second points 12′ and 12. Between the first and second points 12′ and 12, the first and second rays 3′ and 3 interfere with each other to form interference fringes, the interference fringes representing information to be recorded in the photosensitive layer 11b of the information recording medium 11.

摘要翻译： 提供了一种信息处理装置，其能够抑制在记录和再现信息时的杂散光的产生，从而实现质量信息的记录和再现。 信息处理装置包括：辐射光源2; 以及会聚部分，用于将从光源发射的光线朝向具有感光层11b的信息记录介质会聚，其中会聚部分将光线分裂成分别穿过第一和第二空间的第一和第二光线3'和3，除以 至少包含点光轴L的平面，并且将第一和第二光线3'和3收敛在信息记录介质11中的第一和第二点12'和12上，感光层11b介于第一和第二 12点和12点。 在第一和第二点12'和12之间，第一和第二射线3'和3彼此干涉以形成干涉条纹，干涉条纹表示要记录在信息记录介质11的感光层11b中的信息。

公开(公告)号：US06920101B2

公开(公告)日：2005-07-19

申请号：US10616859

申请日：2003-07-10

申请人： Youichi Saitoh ,  Junichi Asada ,  Yuichi Takahashi ,  Seiji Nishiwaki ,  Kenji Nagashima ,  Kazuo Momoo ,  Junji Nagaoka

发明人： Youichi Saitoh ,  Junichi Asada ,  Yuichi Takahashi ,  Seiji Nishiwaki ,  Kenji Nagashima ,  Kazuo Momoo ,  Junji Nagaoka

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

CPC分类号： G11B7/139 ,  G11B7/1353

摘要： An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. This configuration improves recording/reproducing ability since light is focused on an optical disk with high numerical aperture. In addition, since reflected light from the optical disk is detected with low numerical aperture, margins for tilt and defocus are not reduced. Furthermore, since unnecessary signal components contained in the reflected light can be eliminated, a S/N (signal-to-noise ratio) of an information signal also increases. Thus, a high-performance optical disk device can be obtained. Alternatively, by varying the aperture of an objective lens in recording and in reproduction, an optical disk device in which recording density and recording quality are increased without deteriorating reproduction quality can be obtained.

公开(公告)号：US06704254B1

公开(公告)日：2004-03-09

申请号：US09698904

申请日：2000-10-27

申请人： Seiji Nishiwaki ,  Kazuo Momoo ,  Junji Nagaoka

发明人： Seiji Nishiwaki ,  Kazuo Momoo ,  Junji Nagaoka

IPC分类号： G11B700

CPC分类号： G11B7/0956 ,  G11B7/0901 ,  G11B7/0938 ,  G11B7/0943

摘要： This optical disk device includes an objective lens (7) for condensing radiated light from a light source on an optical disk (8), an optical detecting unit for detecting reflected light from the optical disk (8), and a control unit for performing the tracking control and/or the tilt control of the objective lens (7) by utilizing the output from the optical detecting unit, in which the control unit uses the off-track quantity and/or the tilt quantity of the objective lens (7) when performing the above described control.

摘要翻译： 该光盘装置包括用于将来自光源的辐射光聚焦在光盘（8）上的物镜（7），用于检测来自光盘（8）的反射光的光学检测单元，以及用于执行 通过利用来自光学检测单元的输出来跟踪控制和/或物镜（7）的倾斜控制，其中控制单元使用物镜（7）的越野量和/或倾斜量，当 执行上述控制。

公开(公告)号：US06618343B1

公开(公告)日：2003-09-09

申请号：US09436847

申请日：1999-11-09

申请人： Youichi Saitoh ,  Junichi Asada ,  Yuichi Takahashi ,  Seiji Nishiwaki ,  Kenji Nagashima ,  Kazuo Momoo ,  Junji Nagaoka

发明人： Youichi Saitoh ,  Junichi Asada ,  Yuichi Takahashi ,  Seiji Nishiwaki ,  Kenji Nagashima ,  Kazuo Momoo ,  Junji Nagaoka

IPC分类号： G11B700

CPC分类号： G11B7/139 ,  G11B7/1353

摘要： An optical disk device has an aperture of an objective lens in an incoming path of a beam from a semiconductor laser to an optical disk formed larger than an aperture in a return path from the optical disk or an aperture is varied in recording and in reproduction. This configuration improves recording/reproducing ability since light is focused on an optical disk with high numerical aperture. In addition, since reflected light from the optical disk is detected with low numerical aperture, margins for tilt and defocus are not reduced. Furthermore, since unnecessary signal components contained in the reflected light can be eliminated, a S/N (signal-to-noise ratio) of an information signal also increases. Thus, a high-performance optical disk device can be obtained. Alternatively, by varying the aperture of an objective lens in recording and in reproduction, an optical disk device in which recording density and recording quality are increased without deteriorating reproduction quality can be obtained.

摘要翻译： 光盘装置在从半导体激光器到形成大于来自光盘的返回路径的孔径的光盘的入射路径中具有物镜的孔径，或者在记录和重放中变化。 这种配置改善了记录/再现能力，因为光聚焦在具有高数值孔径的光盘上。 此外，由于以较低的数值孔径检测出来自光盘的反射光，因此不会降低用于倾斜和散焦的余量。 此外，由于可以消除包含在反射光中的不必要的信号分量，信息信号的S / N（信噪比）也增加。 因此，可以获得高性能光盘装置。 或者，通过在记录和再现中改变物镜的孔径，可以获得其中增加记录密度和记录质量而不恶化再现质量的光盘装置。

公开(公告)号：US07692875B2

公开(公告)日：2010-04-06

申请号：US11813900

申请日：2006-01-19

申请人： Seiji Nishiwaki ,  Kazuo Momoo

发明人： Seiji Nishiwaki ,  Kazuo Momoo

IPC分类号： G02B13/18 ,  G02B5/18

CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/1275 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

摘要： An optical pickup according to the present invention includes a plurality of light sources for emitting a plurality of light beams including first and second light beams of respectively different wavelengths, an objective lens for converging the plurality of light beams, and a grating structure shaped axisymmetrically with respect to the optical axis of the objective lens. Pth-order diffracted light (where p is a non-zero integer) which is formed from the first light beam (e.g. blue) by the grating structure is converged on an information layer of an optical disk (e.g. a BD) corresponding to the first light beam, owing to the converging actions of the objective lens and grating structure. Moreover, qth-order diffracted light (where q is a non-zero integer such that q≠p) which is formed from the second light beam (e.g. red or infrared) by the grating structure is converged on an information layer of an optical disk (e.g. a DVD or CD) corresponding to the second light beam, owing to the converging actions of the objective lens and the grating structure. Thus, by appropriately using diffracted light of different orders, it becomes possible to perform convergence on optical disks of different wavelengths and base thicknesses, with reduced spherical aberration.

摘要翻译： 根据本发明的光学拾取器包括多个光源，用于发射包括分别不同波长的第一和第二光束的多个光束，用于会聚多个光束的物镜，以及用于对准具有 相对于物镜的光轴。 由光栅结构由第一光束（例如蓝色）形成的P级衍射光（其中p为非零整数）会聚在与第一光束对应的光盘（例如BD）的信息层上 光束，由于物镜和光栅结构的会聚作用。 此外，由光栅结构由第二光束（例如红色或红外）形成的q级衍射光（其中q是非零整数，使得q≠p）会聚在光盘的信息层上 （例如，DVD或CD），由于物镜和光栅结构的会聚作用而对应于第二光束。 因此，通过适当地使用不同阶数的衍射光，可以以减小的球面像差在不同波长和基底厚度的光盘上进行会聚。

公开(公告)号：US20100039686A1

公开(公告)日：2010-02-18

申请号：US12526671

申请日：2008-02-06

申请人： Seiji Nishiwaki ,  Kazuo Momoo

发明人： Seiji Nishiwaki ,  Kazuo Momoo

IPC分类号： G03H1/08 ,  G03H1/12

CPC分类号： G03H1/08 ,  G02B5/32 ,  G03H1/0005 ,  G03H1/02 ,  G03H1/0841 ,  G03H1/0891 ,  G03H1/2249 ,  G03H1/2294 ,  G03H2001/0224 ,  G03H2001/2234 ,  G03H2210/30 ,  G03H2210/452 ,  G03H2210/46 ,  G03H2225/23 ,  G03H2225/24 ,  G03H2240/13 ,  G11B7/0065 ,  G11B7/08564 ,  G11B7/1369

摘要： In order to change the number of light points and light intensities and to move positions of the light points in a real-time manner, an extremely large capacity of a memory is required. In a method according to the present invention, a memory (6) has previously stored therein data indicating a complex amplitude distribution of rays of incident light (L) on a hologram plate (4) and complex amplitude distributions on the hologram plate (4) in a case where the rays are beamed at respective points at which the rays can be beamed. The controller (5) calculates the complex amplitude distribution to be generated on the hologram plate (4) in order to generate a hologram pattern by respectively multiplying, by values indicating degrees of amplitudes of respective rays, complex amplitude distributions of rays of incident light (L) and m light points P1 through Pm to be displayed, and by calculating a sum of the values obtained by the multiplication through performing addition. The controller (5) controls the hologram plate (4) so as to configure a diffraction grating pattern corresponding to the calculated complex amplitude distribution.

摘要翻译： 为了改变光点的数量和光强度并且实时地移动光点的位置，需要非常大的存储容量。 在根据本发明的方法中，存储器（6）预先存储了指示全息板（4）上的入射光（L）的复数振幅分布的数据和全息图板（4）上的复数幅度分布的数据， 在射线能够被射出的各个点射出的情况下。 控制器（5）计算要在全息图板（4）上产生的复数幅度分布，以便通过分别乘以相应各个光线的幅度的值来产生全息图模式，入射光线的复振幅分布 L）和m个光点P1至Pm进行显示，并且通过计算通过执行相加乘法获得的值之和。 控制器（5）控制全息板（4），以便构成对应于所计算的复振幅分布的衍射光栅图案。

公开(公告)号：US20090268583A1

公开(公告)日：2009-10-29

申请号：US12440393

申请日：2007-08-22

申请人： Seiji Nishiwaki ,  Kazuo Momoo

发明人： Seiji Nishiwaki ,  Kazuo Momoo

IPC分类号： G11B7/135

CPC分类号： G11B7/1362 ,  G11B7/0065 ,  G11B7/0901 ,  G11B7/0908 ,  G11B7/128

摘要： An information recording/reproducing device includes a radiation light source 1 such as a semiconductor laser, a spatial modulation element 6 that splits laser light 2 emitted from the radiation light source 1 into a large number of diffracted light rays, and an objective lens 7 that converges the large number of diffracted light rays onto different points. The laser light 2 emitted from the radiation light source 1 is split into a large number of diffracted light rays by the spatial modulation element 6, the large number of diffracted light rays are converged onto different points in the photosensitive layer 8b of the information recording medium 8 by the objective lens 7, and information is recorded in the photosensitive layer 8b of the information recording medium 8, using an assembly of these converging points. Accordingly, it is possible to provide an information recording device capable of realizing high-contrast recording in which stray light or diffraction has no influence during signal recording.

摘要翻译： 信息记录/再现装置包括诸如半导体激光器的辐射光源1，将从辐射光源1发射的激光2分成大量衍射光线的空间调制元件6和物镜7， 将大量的衍射光线会聚到不同的点上。 从辐射光源1发射的激光2被空间调制元件6分成大量的衍射光线，大量的衍射光束会聚在信息记录介质的感光层8b中的不同点上 8，并且使用这些会聚点的组合将信息记录在信息记录介质8的感光层8b中。 因此，可以提供能够实现在信号记录期间杂散光或衍射没有影响的高对比度记录的信息记录装置。

公开(公告)号：US20060013107A1

公开(公告)日：2006-01-19

申请号：US10530585

申请日：2003-10-16

申请人： Seiji Nishiwaki ,  Kazuo Momoo ,  Youichi Saitoh

发明人： Seiji Nishiwaki ,  Kazuo Momoo ,  Youichi Saitoh

IPC分类号： G11B7/00

CPC分类号： G11B7/133 ,  G11B7/0943 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0013

摘要： An optical disk device is provided that can realize favorable recording/reproduction of signals on/from an optical disk having a plurality of signal planes arranged in proximity to each other. In this optical disk device, a hologram (4) is divided into n(n≧2) regions Ak(k=1, 2, . . . , n) by a straight line that intersects with an optical axis, and a photodetector (7) is divided into at least two regions A and A′. Light emitted from a light source (1) is focused on a signal plane (6a) or (6b) included in a plurality of signal planes of the optical disk by an objective lens (5). Light reflected from a first signal plane (6a) and light reflected from a second signal plane (6b) pass through the objective lens (5) to turn into light beams a and a′, respectively, that enter the hologram (4). 1st-order diffracted light beams ak and ak′ having a common diffraction optical axis are derived from the light beams a and a′ that have entered the regions Ak of the hologram (4), respectively, and are projected on the photodetector (7). Distributions of the 1st-order diffracted light beams ak and ak′ on the photodetector (7) are approximately inverted with respect to an intersection point of the diffraction optical axis and a detection plane. The 1st-order diffracted light beam ak is approximately within the region A and the 1st-order diffracted light beam ak′ is approximately within the region A′.

摘要翻译： 提供了一种光盘装置，其可以实现具有彼此靠近布置的多个信号面的光盘的信号的良好记录/再现。 在该光盘装置中，通过与光轴相交的直线将全息图（4）分割成n（n> = 2）个区域Ak（k = 1,2，...，n），以及光检测器 （7）被分成至少两个区域A和A'。 从光源（1）发射的光通过物镜（5）聚焦在包括在光盘的多个信号平面中的信号平面（6a）或（6b）上。 从第一信号面（6a）反射的光和从第二信号面（6b）反射的光分别通过物镜（5）转变成进入全息图（4）的光束a和a' 。 分别从已经进入全息图（4）的区域Ak的光束a和a'导出具有共同的衍射光轴的1级衍射光束ak和ak'并投影在光电检测器（7）上， 。 在光检测器（7）上的1级衍射光束ak和ak'的分布相对于衍射光轴和检测平面的交点近似倒置。 1级衍射光束ak大致在区域A内，1级衍射光束ak'大致在区域A'内。

公开(公告)号：US06914870B2

公开(公告)日：2005-07-05

申请号：US10630304

申请日：2003-07-30

申请人： Junichi Asada ,  Seiji Nishiwaki ,  Yuichi Takahashi ,  Kenji Nagashima ,  Hiroaki Matsumiya ,  Youichi Saitoh ,  Kazuo Momoo

发明人： Junichi Asada ,  Seiji Nishiwaki ,  Yuichi Takahashi ,  Kenji Nagashima ,  Hiroaki Matsumiya ,  Youichi Saitoh ,  Kazuo Momoo

IPC分类号： G02B5/32 ,  G11B7/09 ,  G11B7/125 ,  G11B7/13 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/1263 ,  G11B7/1362 ,  G11B7/1378 ,  G11B7/1398 ,  G11B2007/13725

摘要： To implement light quantity monitoring with high frequency responsivity and correction of astigmatic differences of a semiconductor laser with a simple configuration with a fewer parts.Of the light beam output from a semiconductor laser light source 101, a peripheral beam component is entered by a light reflection element 107 into an anterior light monitoring photodetector 103 formed in the vicinity of a semiconductor laser light source 101. Furthermore, the surface of the reflection sphere of the light reflection element is formed anamorphic, and thus condensed to an appropriate size on the photodetector without being focused, providing high frequency responsivity. Furthermore, the light reflection element 107 is placed inclined at a predetermined angle so as to cancel out astigmatic difference of the optical semiconductor laser light source 101. In addition, the photodetector 103 is placed in the direction so that a reflected light 108 is bent by an inclination of the light reflection element 107, reducing the amount of parallel displacement during adjustment of the light reflection element 107.

摘要翻译： 实现具有高频率响应性的光量监测和半导体激光器的散光差异的校正，具有更少部件的简单配置。 在从半导体激光光源101输出的光束中，通过光反射元件107将周边光束分量输入到形成在半导体激光光源101附近的前光监视光电检测器103中。 此外，光反射元件的反射球的表面形成为变形的，并因此在不被聚焦的情况下在光电检测器上聚光到适当的尺寸，从而提供高频响应度。 此外，光反射元件107以预定角度倾斜放置，以抵消光半导体激光源101的像散差。 此外，光电检测器103被放置成使得反射光108被光反射元件107的倾斜弯曲，从而减少了光反射元件107的调节期间的平行移动量。