公开(公告)号：US20100271926A1

公开(公告)日：2010-10-28

申请号：US12768510

申请日：2010-04-27

申请人： Kenji Nagatomi

发明人： Kenji Nagatomi

IPC分类号： G11B7/135

CPC分类号： G11B7/1378 ,  G11B7/0903 ,  G11B7/0912 ,  G11B7/094 ,  G11B7/133

摘要： An optical pickup device imparts different astigmatisms from each other to light fluxes in four light flux areas formed around an optical axis of laser light, out of the laser light reflected on a disc. The optical pickup device also changes the propagating directions of the light fluxes in the light flux areas to separate the light fluxes in the light flux areas each other. A signal light area where only signal light exists is defined on a detection surface of a photodetector. Eight sensing portions are arranged at a position corresponding to the signal light area. According to this arrangement, only the signal light is received by the sensing portions to thereby suppress deterioration of a detection signal resulting from stray light. Further, a push-pull signal, whose DC component is suppressed, is obtained by computing an output from the eight sensing portions by a predetermined formula.

摘要翻译： 光拾取装置将不同的散光彼此分配给在光盘上反射的激光中形成在激光的光轴周围的四个光通量区域中的光通量。 光学拾取装置还改变光束区域中的光束的传播方向，以分离光束区域中的光束。 仅在信号光存在的信号光区域被限定在光检测器的检测表面上。 八个感测部分布置在对应于信号光区域的位置处。 根据这种布置，只有信号光被感测部分接收，从而抑制由杂散光引起的检测信号的劣化。 此外，通过以预定公式计算来自八个感测部分的输出，获得DC分量被抑制的推挽信号。

公开(公告)号：US20100260030A1

公开(公告)日：2010-10-14

申请号：US12823162

申请日：2010-06-25

申请人： Yukihiro TAO ,  Kenichi Yuyama

发明人： Yukihiro TAO ,  Kenichi Yuyama

IPC分类号： G11B7/135 ,  G02F1/13 ,  G02F1/133

CPC分类号： G11B7/1353 ,  G02B5/1828 ,  G02B5/3016 ,  G02B5/3083 ,  G02B26/0808 ,  G02F1/13 ,  G02F1/133365 ,  G02F1/133371 ,  G02F1/1337 ,  G02F1/133707 ,  G02F1/31 ,  G02F2001/133726 ,  G02F2001/13706 ,  G02F2001/13712 ,  G02F2201/305 ,  G02F2203/28 ,  G11B7/1369

摘要： A liquid crystal element includes: a transparent substrate; and a liquid crystal layer including: a liquid crystal material; and a concavo-convex portion including periodic concaves and convexes, wherein the concavo-convex portion is aligned so that a longitudinal direction of liquid crystal molecules that are positioned on a side of the transparent substrate and on a concavo-convex surface that is an interface of the concavo-convex portion substantially becomes a vertical direction with respect to a concavo-convex surface on the side of the transparent substrate, or a longitudinal direction of liquid crystal molecules that are positioned on a side, in which a medium is disposed and which is opposite to the transparent substrate, and on the concavo-convex surface that is the interface of the concavo-convex portion substantially becomes the vertical direction with respect to a concavo-convex surface on the side, in which the medium is disposed, to form a diffraction grating.

摘要翻译： 液晶元件包括：透明基板; 和液晶层，包括：液晶材料; 以及包括周期性凹凸的凹凸部，其中，所述凹凸部对准，使得位于所述透明基板的一侧的液晶分子的纵向方向和作为界面的凹凸面 相对于透明基板一侧的凹凸面或位于配置有介质的一侧的液晶分子的纵向方向，凹凸部基本上成为垂直方向，哪个 与透明基板相对，并且作为凹凸部的界面的凹凸面基本上成为相对于设置介质的一侧的凹凸面的垂直方向，形成 衍射光栅。

公开(公告)号：US20100254248A1

公开(公告)日：2010-10-07

申请号：US12679041

申请日：2008-09-19

申请人： Yasuhiro Tanaka ,  Michihiro Yamagata ,  Katsuhiko Hayashi ,  Masahiro Birukawa

发明人： Yasuhiro Tanaka ,  Michihiro Yamagata ,  Katsuhiko Hayashi ,  Masahiro Birukawa

IPC分类号： G11B7/135

CPC分类号： G11B7/13927 ,  G11B7/1378 ,  G11B7/1387 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical system for optical pickup, which optical system is used for performing recording, reproducing, and/or erasing of information on an optical recording medium and has a simple configuration, is provided. An optical pickup device 1 includes a collimator lens system 23, a beam expander 33, and an objective lens system 34 that includes an S-SIL element 27b. The beam expander 33 includes three lens elements 33a to 33c. By moving in an optical axis direction, the two lens elements 33a and 33b included in the beam expander 33 adjust a focal point of a spot formed within an optical recording medium 28, and compensate a spherical aberration caused by the difference in depth between recording layers.

摘要翻译： 提供了一种用于光学拾取器的光学系统，该光学系统用于在光学记录介质上执行信息的记录，再现和/或擦除并且具有简单的配置。 光拾取装置1包括准直透镜系统23，光束扩展器33和包括S-SIL元件27b的物镜系统34。 扩束器33包括三个透镜元件33a至33c。 通过沿光轴方向移动，包括在扩束器33中的两个透镜元件33a和33b调节在光记录介质28内形成的光点的焦点，并补偿由记录层之间的深度差引起的球面像差 。

公开(公告)号：US20100254236A1

公开(公告)日：2010-10-07

申请号：US12602718

申请日：2008-05-29

申请人： Eishin Mori ,  Kousei Sano ,  Joji Anzai ,  Hideki Aikoh

发明人： Eishin Mori ,  Kousei Sano ,  Joji Anzai ,  Hideki Aikoh

IPC分类号： G11B20/10 ,  G11B7/135

CPC分类号： G11B7/13925 ,  G11B7/1376 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An object of the invention is to suppress an influence of a wavefront aberration which is generated at the time of correcting a third-order spherical aberration, and realize satisfactory information recording and/or reproducing. A collimator lens 4 corrects a third-order spherical aberration which is generated depending on the thickness of a light transmissive layer from a surface of a first optical information recording medium 30, corresponding to an optimal substrate thickness of a first objective lens 6, to an intended information recording surface, assuming that the light transmissive layer thickness of the first optical information recording medium 30 which minimizes a residual third-order spherical aberration at the time of incidence of parallel light into the first objective lens 6 is defined as the optimal substrate thickness of the first objective lens 6. The optimal substrate thickness of the first objective lens 6 is defined in such a manner that a variation of a wavefront aberration which is generated on the information recording surface of the first optical information recording medium 30 farthest from the first objective lens 6 at the time of correcting the third-order spherical aberration, and a variation of a wavefront aberration which is generated on the information recording surface of the first optical information recording medium 30 closest to the first objective lens 6 at the time of correcting the third-order spherical aberration are set equal to each other.

摘要翻译： 本发明的目的是抑制在校正三次球面像差时产生的波前像差的影响，并且实现满意的信息记录和/或再现。 准直透镜4将与第一光学信息记录介质30的表面相对应的透光层的厚度相应于第一物镜6的最佳基板厚度的三次球面像差校正为 假设将平行光入射到第一物镜6中的残余三阶球面像差最小化的第一光学信息记录介质30的透光层厚度定义为最佳基板厚度 第一物镜6的最佳基板厚度被定义为使得在第一光信息记录介质30的信息记录表面上产生的波前像差的变化最远离第一物镜6的第一物镜6。 在校正三次球面像差时的物镜6，以及a 在校正三次球面像差时在最靠近第一物镜6的第一光学信息记录介质30的信息记录表面上产生的波前像差的变化被设置为彼此相等。

公开(公告)号：US20100220578A1

公开(公告)日：2010-09-02

申请号：US12159425

申请日：2006-12-27

申请人： Fumitomo Yamasaki ,  Katsuhiko Hayashi ,  Sadao Mizuno ,  Hideki Aikoh

发明人： Fumitomo Yamasaki ,  Katsuhiko Hayashi ,  Sadao Mizuno ,  Hideki Aikoh

IPC分类号： G11B7/135 ,  G02B11/02 ,  G02B13/18

CPC分类号： G02B9/10 ,  G02B3/08 ,  G02B13/18 ,  G11B7/1275 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

摘要： Provides an objective lens, an optical head and an optical disc apparatus (drive) capable of compensating for various types of aberrations including wavelength changes for a plurality of types of optical discs including high density optical discs, DVDs and CDs with a good wavelength dispersion compensation ability and thus capable of providing good recording or reproduction characteristics.The objective lens according to the present invention includes a first lens and a second lens substantially in close contact with each other such that optical axes thereof match each other, and acts as a convex lens as a whole. Each lens includes a central portion including the optical axis and a peripheral portion located in a periphery of the central portion. The central portion of the first lens acts as a convex lens; and the central portion of the second lens acts as a concave lens. Where the refractive index of the first lens at d line (wavelength: 587.56 nm) is nd1, the Abbe constant of the first lens represented using the refractive indices at d line, F line (wavelength: 486.13 nm) and C line (wavelength: 656.27 nm) is νd1, the refractive index of the second lens at d line is nd2, and the Abbe constant of the second lens represented using the refractive indices at d line, F line and C line is νd2, the objective lens fulfills nd1>nd2 and νd1>νd2.

摘要翻译： 提供能够补偿包括具有良好的波长色散补偿的高密度光盘，DVD和CD的多种类型的光盘的波长变化的各种像差的物镜，光头和光盘装置（驱动器） 因此能够提供良好的记录或再现特性。 根据本发明的物镜包括基本上彼此紧密接触的第一透镜和第二透镜，使得其光轴彼此匹配，并且作为整体起凸透镜的作用。 每个透镜包括包括光轴的中心部分和位于中心部分的周边的周边部分。 第一透镜的中心部分用作凸透镜; 并且第二透镜的中心部分用作凹透镜。 在d线（波长：587.56nm）处的第一透镜的折射率为nd1的情况下，使用在d线，F线（波长：486.13nm）和C线（波长：48nm）处的折射率表示的第一透镜的阿贝常数 656.27nm）是d1，d线的第二透镜的折射率为nd2，使用d线，F线和C线的折射率表示的第二透镜的阿贝常数为d2，目标 镜头满足nd1> nd2和＆ngr; d1>＆ngr; d2。

公开(公告)号：US20100220575A1

公开(公告)日：2010-09-02

申请号：US12713961

申请日：2010-02-26

申请人： Wen-Hsin Sun ,  Mao-Jen Wu ,  Hsiao-Chin Lan ,  An-Nong Wen ,  Chih-Hung Hsu

发明人： Wen-Hsin Sun ,  Mao-Jen Wu ,  Hsiao-Chin Lan ,  An-Nong Wen ,  Chih-Hung Hsu

IPC分类号： G11B7/135

CPC分类号： G11B7/1275 ,  G11B7/123 ,  G11B7/1356 ,  G11B2007/0006

摘要： An optical pickup head includes a first light source, a second light source, a base, a light adjusting unit, and a light guiding unit. The first light source emits a first wavelength light beam to read a first data density optical storage medium. The second light source emits a second wavelength light beam to read a second data density optical storage medium. The base includes at least a slant surface for reflecting the first wavelength light beam and the second wavelength light beam, so that the first wavelength light beam and the second wavelength light beam are parallel with each other. The light adjusting unit adjusts the first wavelength light beam and the second wavelength light beam to the same optical axis. The light guiding unit guides the first wavelength light beam and the second wavelength light beam to the first data density optical storage medium or the second data density optical storage medium.

摘要翻译： 光拾取头包括第一光源，第二光源，基座，调光单元和导光单元。 第一光源发射第一波长光束以读取第一数据密度光存储介质。 第二光源发射第二波长光束以读取第二数据密度光存储介质。 该基部至少包括用于反射第一波长光束和第二波长光束的倾斜表面，使得第一波长光束和第二波长光束彼此平行。 光调整单元将第一波长光束和第二波长光束调整到相同的光轴。 导光单元将第一波长光束和第二波长光束引导到第一数据密度光存储介质或第二数据密度光存储介质。

公开(公告)号：US20100214902A1

公开(公告)日：2010-08-26

申请号：US12703294

申请日：2010-02-10

申请人： Fumiaki Nakano ,  Nobuhiko Ando ,  Noriaki Nishi ,  Takashi Nakao ,  Hiroaki Nakagawa ,  Yutaka Tentaku

发明人： Fumiaki Nakano ,  Nobuhiko Ando ,  Noriaki Nishi ,  Takashi Nakao ,  Hiroaki Nakagawa ,  Yutaka Tentaku

IPC分类号： G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/0903 ,  G11B7/131 ,  G11B2007/0013

摘要： An optical pickup includes: a light source outputting a light beam; an objective lens collecting the light beam on a target recording layer as a target of plural recording layers provided in an optical disc; a lens moving unit moving the objective lens in a tracking direction nearly orthogonal to track grooves helically or coaxially formed in the target recording layer; a collective lens collecting a reflected light beam formed when the light beam is reflected by the optical disc; a diffraction optical element diffracting part of the reflected first-order light beam in predetermined directions as first, second, third and fourth beams; and a photodetector receiving the first and second beams using first and second light receiving areas, and generating light reception signals, and receiving the third and fourth beams using third and fourth light receiving areas, and generates light reception signals.

摘要翻译： 光拾取器包括：输出光束的光源; 将目标记录层上的光束收集成设置在光盘中的多个记录层的目标物的物镜; 透镜移动单元，沿跟踪方向移动所述物镜，所述跟踪方向与所述目标记录层中螺旋或同轴地形成的轨道槽几乎正交; 收集当光束被光盘反射时形成的反射光束的集体透镜; 衍射光学元件将预定方向的反射一次光束的一部分衍射为第一，第二，第三和第四光束; 以及光电检测器，其使用第一和第二光接收区域接收第一和第二光束，并且产生光接收信号，并且使用第三和第四光接收区域接收第三和第四光束，并且产生光接收信号。

公开(公告)号：US20100208569A1

公开(公告)日：2010-08-19

申请号：US12708071

申请日：2010-02-18

申请人： Kenji Nagatomi

发明人： Kenji Nagatomi

IPC分类号： G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/1367

摘要： An optical pickup device has an astigmatism element, a polarization setting element, and a polarizer. The astigmatism element converges laser light reflected on a disc in a first direction and a second direction to form a first focal line and a second focal line. The polarization setting element makes polarization directions of light fluxes different from each other, the light fluxes being obtained by dividing a light flux of the laser light transmitted through the astigmatism element into two by a straight line parallel to the first direction. The polarizer transmits light having polarization directions obtained by inverting the polarization directions set by the polarization setting element with respect to the straight line parallel to the first direction, respectively.

摘要翻译： 光学拾取装置具有像散元件，偏振设置元件和偏振器。 散光元件在第一方向和第二方向上会聚在盘上反射的激光，以形成第一焦线和第二焦线。 偏光设定元件使光束的偏振方向彼此不同，通过将通过像散元件透射的激光的光束分割成与第一方向平行的直线来获得光束。 偏振器透射具有偏振方向的光，该偏振方向通过相对于平行于第一方向的直线反转由偏振设置元件设置的偏振方向而获得。

公开(公告)号：US20100208557A1

公开(公告)日：2010-08-19

申请号：US12738962

申请日：2008-10-09

申请人： Manami Kuiseko ,  Naoki Nishida ,  Kenji Konno ,  Koujirou Sekine

发明人： Manami Kuiseko ,  Naoki Nishida ,  Kenji Konno ,  Koujirou Sekine

IPC分类号： G11B7/00 ,  G11B7/135 ,  G11B11/00

CPC分类号： G11B5/02 ,  G11B5/314 ,  G11B5/4866 ,  G11B5/6088 ,  G11B7/08576 ,  G11B7/1359 ,  G11B7/1384 ,  G11B2005/0005 ,  G11B2005/0021

摘要： An optical head includes: a slider which moves relative to a recording medium while the slider is floating above the recording medium; an optical waveguide which is provided on a side surface of an end portion of the slider and which has the focusing function of forming a light spot on the recording medium; and a light guide optical system that guides a light pencil to the optical waveguide. A light pencil coupling portion which receives the light pencil from the light guide optical system is provided in a surface parallel to a direction in which the light pencil is guided by the optical waveguide; and a reflective surface which deflects the light pencil to the light pencil coupling portion is provided in the light guide optical system. The light pencil coupling portion has the function of correcting aberration resulting from oblique incidence of the light pencil obliquely incident from the light guide optical system. A medium member which has a refractive index of more than one is provided between the reflective surface and the light pencil coupling portion.

摘要翻译： 光学头包括：当滑动器浮动在记录介质上方时相对于记录介质移动的滑块; 光波导，其设置在滑块的端部的侧表面上，并且具有在记录介质上形成光斑的聚焦功能; 以及将光笔引导到光波导的导光光学系统。 从光导光学系统接收光笔的光笔耦合部分设置在平行于光笔被光波导引导的方向的表面上; 并且在光导光学系统中设置将光笔偏转到光笔耦合部分的反射表面。 光笔耦合部具有校正从导光光学系统倾斜入射的光笔倾斜入射引起的像差的功能。 在反射表面和光笔耦合部分之间设置折射率大于1的介质构件。

公开(公告)号：US07764585B2

公开(公告)日：2010-07-27

申请号：US11487233

申请日：2006-07-14

申请人： Takaaki Furuya ,  Kenichi Tanaka

发明人： Takaaki Furuya ,  Kenichi Tanaka

IPC分类号： G11B7/135 ,  G11B7/00

CPC分类号： G11B7/1362 ,  G11B7/1359 ,  G11B7/1369 ,  G11B7/13925 ,  G11B7/1395 ,  G11B11/10541 ,  G11B2007/0006

摘要： There is provided an optical head which have no such problems regarding increase in cost and size thereof and can reduce errors by suppressing crosstalk components attributable to reflection on lands of a magneto-optical recording medium and thereby prevent degradation of reproduction characteristics. An optical element includes a light separating section for separating outgoing light and return light, and a phase compensation section for imparting phase compensation to light incident thereon. The optical element is provided on a light path of return light between an objective lens and a photodetector, so as to be closer to the photodetector than the light separating section is. This makes it possible to impart the phase compensation to the return light and prevent the degradation of reproduction characteristics. Light separating elements such as beam splitter are no more necessary in the configuration, with the result that decreases in size and cost can be realized.

摘要翻译： 提供了一种在成本和尺寸增加方面没有这种问题的光头，并且可以通过抑制归因于磁光记录介质的焊盘上的反射的串扰分量来减少误差，从而防止再现特性的劣化。 光学元件包括用于分离出射光和返回光的光分离部分，以及用于对入射到其上的光进行相位补偿的相位补偿部分。 光学元件设置在物镜和光电检测器之间的返回光的光路上，以便比光分离部更靠近光电检测器。 这使得可以对返回光赋予相位补偿并防止再现特性的劣化。 在配置中不需要诸如分光器的光分离元件，结果可以实现尺寸和成本的降低。