公开(公告)号：US07859953B2

公开(公告)日：2010-12-28

申请号：US11768616

申请日：2007-06-26

申请人： Katsuhiro Seo

发明人： Katsuhiro Seo

IPC分类号： G11B7/12

CPC分类号： G11B7/1381 ,  G11B2007/0006

摘要： An optical pickup includes: a light source; an objective lens; a beam splitter; a quarter wave plate that transforms the optical beam into a circularly polarized optical beam and also transforms the circularly polarized reflection optical beam into an optical beam whose polarization direction is perpendicular to the optical beam; a light detector; a neutral density filter section placed on a mutual optical path of those beams, reducing the intensity of the optical beam while maintaining the intensity of the reflection optical beam; and a filter drive section that puts the neutral density filter section in the mutual optical path or outside of it, wherein the intensity of the optical beam and the filter drive section are controlled such that the amount of the optical beam emitted to the optical disc is maintained at a predetermined level.

摘要翻译： 光拾取器包括：光源; 物镜; 分束器; 将光束变换为圆偏振光束的四分之一波片，还将圆偏振反射光束变换为偏振方向垂直于光束的光束; 光检测器 放置在这些光束的相互光路上的中性浓度滤光片部分，在保持反射光束的强度的同时降低光束的强度; 以及将中性浓度滤光器部分放置在相互光路中或其外部的滤光器驱动部分，其中控制光束和滤光器驱动部分的强度，使得发射到光盘的光束的量为 维持在预定水平。

公开(公告)号：US07800986B2

公开(公告)日：2010-09-21

申请号：US11678395

申请日：2007-02-23

申请人： Takashi Kobayashi ,  Katsuhiro Seo ,  Yoshiki Okamoto ,  Noriyuki Kato

发明人： Takashi Kobayashi ,  Katsuhiro Seo ,  Yoshiki Okamoto ,  Noriyuki Kato

IPC分类号： G11B7/00

CPC分类号： G11B7/0901 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical pickup for recording or reproducing an information signal in an optical disc includes a light source for emitting a light beam toward the optical disc, an objective lens for focusing the light beam emitted from the light source onto a recording surface of the optical disc, and a photodetector for receiving the light beam reflected by the recording surface of the optical disc and outputting a signal corresponding to an intensity of the received light beam. A spot of the light beam received by the photodetector is asymmetric in both a radial direction and a tangential direction of the optical disc. A lens shift signal for the objective lens is detected by a controller on the basis of the signal output from the photodetector, the controller controlling the objective lens to follow the optical disc.

摘要翻译： 用于在光盘中记录或再现信息信号的光学拾取器包括用于向光盘发射光束的光源，用于将从光源发射的光束聚焦到光盘的记录表面上的物镜， 以及光电检测器，用于接收由光盘的记录表面反射的光束，并输出与所接收的光束的强度对应的信号。 由光电检测器接收的光束的光点在光盘的径向和切线方向上是不对称的。 控制器根据从光电检测器输出的信号，控制物镜跟随光盘的控制器检测物镜的透镜移位信号。

公开(公告)号：US07492676B2

公开(公告)日：2009-02-17

申请号：US11859165

申请日：2007-09-21

申请人： Yoshiki Okamoto ,  Katsuhiro Seo

发明人： Yoshiki Okamoto ,  Katsuhiro Seo

IPC分类号： G11B7/00

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

摘要： An optical pickup for recording/reproducing information on/from an optical disc having recording layers, includes a light source; an objective lens for condensing an optical beam emitted from the light source on the recording layer; a photo-detector having a light-receiving section for receiving return light from the optical disc; an optical-path separating unit for separating the optical path of the return light reflected by the optical disc from the optical path of the optical beam emitted from the light source; and a masking member having a masking unit shielding part of a passing-through optical beam, in which the masking unit shields the central region of the optical beam to be incident in the light-receiving section among the optical beams reflected by the other recording layers or surfaces different from the recording layer recording/reproducing information so as not to admit the central region to the light-receiving section.

摘要翻译： 一种用于在具有记录层的光盘上记录/再现信息的光学拾取器，包括光源; 用于将从光源发射的光束聚光在记录层上的物镜; 光检测器，具有用于从光盘接收返回光的光接收部分; 光路分离单元，用于将由光盘反射的返回光的光路与从光源发射的光束的光路分离; 以及遮蔽构件，其具有通过光束的掩模单元屏蔽部分，其中所述掩蔽单元屏蔽由所述其它记录层反射的光束中的入射在所述光接收部分中的所述光束的中心区域 或与记录层记录/再现信息不同的表面，以便不将中心区域接纳到光接收部分。

公开(公告)号：US20050276297A1

公开(公告)日：2005-12-15

申请号：US11116303

申请日：2005-04-28

申请人： Noriaki Nishi ,  Yoshiki Okamoto ,  Katsuhiro Seo ,  Satoshi Imai ,  Kenji Yamamoto ,  Takeshi Yonezawa ,  Midori Kanaya ,  Hiroaki Nakagawa

发明人： Noriaki Nishi ,  Yoshiki Okamoto ,  Katsuhiro Seo ,  Satoshi Imai ,  Kenji Yamamoto ,  Takeshi Yonezawa ,  Midori Kanaya ,  Hiroaki Nakagawa

IPC分类号： G11B7/135 ,  G11B7/00 ,  G11B7/125 ,  H01S5/00

CPC分类号： G11B7/1369 ,  G11B7/1378 ,  G11B7/13925 ,  G11B2007/0006 ,  G11B2007/13727 ,  H01S5/005

摘要： An optical pickup includes a laser light source configured to emit laser light, an objective lens configured to focus the laser light emitted from the laser light onto an optical disk, and an image-formation magnification rate varying section for varying an image-formation magnification rate at which the laser light is focused on the optical disk.

摘要翻译： 光学拾取器包括被配置为发射激光的激光光源，被配置为将从激光发射的激光聚焦到光盘上的物镜，以及用于改变成像放大率的成像倍率变化部分 其中激光聚焦在光盘上。

公开(公告)号：US20070206451A1

公开(公告)日：2007-09-06

申请号：US11678395

申请日：2007-02-23

申请人： Takashi Kobayashi ,  Katsuhiro Seo ,  Yoshiki Okamoto ,  Noriyuki Kato

发明人： Takashi Kobayashi ,  Katsuhiro Seo ,  Yoshiki Okamoto ,  Noriyuki Kato

IPC分类号： G11B7/00

CPC分类号： G11B7/0901 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical pickup for recording or reproducing an information signal in an optical disc includes a light source for emitting a light beam toward the optical disc, an objective lens for focusing the light beam emitted from the light source onto a recording surface of the optical disc, and a photodetector for receiving the light beam reflected by the recording surface of the optical disc and outputting a signal corresponding to an intensity of the received light beam. A spot of the light beam received by the photodetector is asymmetric in both a radial direction and a tangential direction of the optical disc. A lens shift signal for the objective lens is detected by a controller on the basis of the signal output from the photodetector, the controller controlling the objective lens to follow the optical disc.

摘要翻译： 用于在光盘中记录或再现信息信号的光学拾取器包括用于向光盘发射光束的光源，用于将从光源发射的光束聚焦到光盘的记录表面上的物镜， 以及光电检测器，用于接收由光盘的记录表面反射的光束，并输出与所接收的光束的强度对应的信号。 由光电检测器接收的光束的光点在光盘的径向和切线方向上是不对称的。 控制器根据从光电检测器输出的信号，控制物镜跟随光盘的控制器检测物镜的透镜移位信号。

公开(公告)号：US20070109930A1

公开(公告)日：2007-05-17

申请号：US11598579

申请日：2006-11-14

申请人： Yoshiki Okamoto ,  Katsuhiro Seo

发明人： Yoshiki Okamoto ,  Katsuhiro Seo

IPC分类号： G11B7/00

CPC分类号： G11B7/131 ,  G11B7/094 ,  G11B7/0943 ,  G11B7/1353

摘要： An optical pickup includes an optical system in which light from a light source is introduced through an objective lens into an optical recording medium and in which light reflected from the optical recording medium is introduced into a light-receiving unit and an objective lens driving unit for driving the objective lens based on a light output detected at said light-receiving unit. In this optical pickup, a diffraction element is provided between the light source and the objective lens, the diffraction element is provided with at least first and second diffraction areas and the first and second diffraction areas have such grating shapes that ±first-order diffracted lights diffracted are received by the light-receiving unit at the position in which 0-th order light and ±first-order diffracted lights generated from guide grooves of the optical recording medium may not overlap with each other.

摘要翻译： 光学拾取器包括光学系统，其中来自光源的光通过物镜被引入到光学记录介质中，并且其中从光学记录介质反射的光被引入光接收单元和物镜驱动单元 基于在所述光接收单元处检测到的光输出来驱动物镜。 在该光学拾取器中，在光源和物镜之间设置衍射元件，衍射元件设置有至少第一和第二衍射区域，并且第一和第二衍射区域具有这样的光栅形状，即±一级衍射光 衍射由光接收单元在从光记录介质的引导槽产生的0级光和±一级衍射光彼此不重叠的位置处接收。

公开(公告)号：US20060050413A1

公开(公告)日：2006-03-09

申请号：US11214748

申请日：2005-08-31

申请人： Katsuhiro Seo ,  Yoshiaki Kato ,  Yoshiki Okamoto ,  Takeshi Yonezawa

发明人： Katsuhiro Seo ,  Yoshiaki Kato ,  Yoshiki Okamoto ,  Takeshi Yonezawa

IPC分类号： G02B9/00

CPC分类号： G11B7/13927 ,  G11B7/1376 ,  G11B7/24038

摘要： An optical pickup includes at least a laser light source emitting a laser beam, a collimator lens system including a plurality of lenses for collimating the light beam emitted from the laser light source and incident thereupon as diffused light, and an objective lens. The laser beam transmitted through the collimator lens system is incident upon the objective lens. The collimator lens system includes a first lens unit held so as to be movable in an optical axis direction of the laser beam and a fixed second lens unit.

摘要翻译： 光拾取器至少包括发射激光束的激光光源，准直透镜系统，其包括多个透镜，用于准直来自激光光源的光束并作为漫射光入射到其上;以及物镜。 透射准直透镜系统的激光束入射到物镜上。 准直透镜系统包括保持以能够在激光束的光轴方向上移动的第一透镜单元和固定的第二透镜单元。

公开(公告)号：US06312780B1

公开(公告)日：2001-11-06

申请号：US09504812

申请日：2000-02-16

申请人： Yutaka Kasami ,  Osamu Kawakubo ,  Katsuhiro Seo

发明人： Yutaka Kasami ,  Osamu Kawakubo ,  Katsuhiro Seo

IPC分类号： B32B302

CPC分类号： G11B7/252 ,  G11B7/00454 ,  G11B7/006 ,  G11B7/24 ,  G11B7/2534 ,  G11B7/2542 ,  G11B7/2578 ,  G11B7/2585 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/24316 ,  G11B2007/25708 ,  G11B2007/2571 ,  G11B2007/25711 ,  G11B2007/25713 ,  G11B2007/25715 ,  G11B2007/25716 ,  Y10S428/913 ,  Y10S430/146 ,  Y10T428/21 ,  Y10T428/31678

摘要： A phase change optical recording medium which enables optimum direct overwrite even under high speed high density conditions without degrading repetition durability or storage stability of recorded signals. To this end, the phase change optical recording medium has a recording layer formed at least of a phase change material and is recorded and/or reproduced with a laser light beam having a wavelength ranging between 380 nm and 420 nm. A ratio Ac/Aa, where Ac is the absorption rate of said recording layer in a crystalline state and Aa is the absorption rate of said recording layer in an amorphous state, is not less than 0.9, and a crystallization promoting layer promoting the crystallization of the phase change material is contacted with at least one surface of the recording layer. By exploiting the absorption rate control and the crystallization promotion in combination, it is possible to positively compensate the difference between the physical properties of the crystal phase and those of the amorphous phase to realize optimum direct overwrite.

摘要翻译： 相变光学记录介质，即使在高速高密度条件下也能够实现最佳直接重写，而不会降低记录信号的重复耐久性或存储稳定性。 为此，相变光学记录介质具有至少形成相变材料的记录层，并用波长在380nm与420nm之间的激光束进行记录和/或再现。 其中Ac是结晶状态下所述记录层的吸收速率和Aa是所述记录层在无定形状态下的吸收速率的比率Ac / Aa不小于0.9，促进结晶的结晶促进层 相变材料与记录层的至少一个表面接触。 通过组合吸收速率控制和结晶促进，可以肯定地补偿晶相的物理性质和非晶相的物理性能之间的差异，以实现最佳的直接覆盖。

公开(公告)号：US6160776A

公开(公告)日：2000-12-12

申请号：US122154

申请日：1998-07-24

申请人： Katsuhiro Seo

发明人： Katsuhiro Seo

IPC分类号： G11B7/007 ,  G11B7/26 ,  G11B20/14 ,  G11B27/10 ,  G11B27/11 ,  G11B27/19 ,  G11B27/24 ,  G11B27/30 ,  G11B5/09

CPC分类号： G11B7/24082 ,  G11B7/261 ,  G11B20/1403 ,  G11B27/105 ,  G11B27/11 ,  G11B27/19 ,  G11B27/24 ,  G11B27/3027 ,  G11B2220/20 ,  G11B2220/216 ,  G11B2220/235 ,  G11B2220/65

摘要： Accurate detection of a clock synchronization mark represented by wobbles of a track is realized. A track is wobbled by a synchronization mark signal which has a waveform such that the differential value near the leading portion and the trailing portion of the waveform is a value smaller than that of a rectangular wave, thereby wobbled portions corresponding to synchronization marks are formed. For example, a synchronization mark signal is a signal of a waveform such that both end portions of the waveform are almost linear, in which level variations are moderate, and the center of the waveform has sharp level variations.

摘要翻译： 实现由轨道的摆动表示的时钟同步标记的精确检测。 轨道由同步标记信号摆动，该同步标记信号具有使得波形的前导部分和后端部分附近的差分值比矩形波的值小的波形，从而形成与同步标记相对应的摆动部分。 例如，同步标记信号是波形的信号，使得波形的两个端部几乎是线性的，其中电平变化适中，并且波形的中心具有尖锐的电平变化。

公开(公告)号：US5577018A

公开(公告)日：1996-11-19

申请号：US122411

申请日：1993-09-21

申请人： Hideyoshi Horimai ,  Katsuhiro Seo ,  Kimihiro Saito ,  Kiyoshi Toyota

发明人： Hideyoshi Horimai ,  Katsuhiro Seo ,  Kimihiro Saito ,  Kiyoshi Toyota

IPC分类号： G02B5/04 ,  G02B5/30 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G11B11/105 ,  G11B11/10

CPC分类号： G11B7/131 ,  G02B5/04 ,  G02B5/3083 ,  G11B11/10543 ,  G11B7/123 ,  G11B7/1356 ,  G11B7/1359 ,  G11B7/1367

摘要： In an optical pickup apparatus, including a laser source (11) arranged along an optical axis (0-0'), a polarization beam splitter (14) and an objective lens (13), wherein light emitted from the laser source (11) is emitted on a recording plane (1a) of an optical-magnetical recording media (1) as a converged beam, light beams reflected from the recording media (1a) of the optical-magnetical recording media (1) are separated by said polarization beam splitter (14) to obtain a predetermined polarized light component, a phase change means, which changes a phase of light passing through one side of said optical axis (0-0') and a phase of light passing through another side of said optical axis (0-0') by a predetermined angle, such as 1/2 wavelength plate (15), a phase retardation type prism (39) and a combination optical rotation plate (52), is provided between the polarization beam splitter (14) and the objective lens (13), and, an optical detection element, which detects the light polarized by the polarization beam splitter (14), is provided at a side intersecting the phase change means of the polarization beam splitter (14).

摘要翻译： PCT No.PCT / JP93 / 00158 Sec。 371日期：1993年9月21日 102（e）日期1993年9月21日PCT提交1993年2月8日PCT公布。 公开号WO93 / 16469 日期：1993年8月19日在包括沿着光轴（0-0'）配置的激光源（11），偏振分束器（14）和物镜（13）的光拾取装置中， 激光源（11）作为会聚光束在光磁记录介质（1）的记录平面（1a）上发射，从光磁记录介质（1）的记录介质（1a）反射的光束是 由所述偏振分束器（14）分离以获得预定的偏振光分量;相位改变装置，其改变通过所述光轴（0-0'）的一侧的光的相位和通过另一个的光的相位 所述光轴（0-0'）的一侧具有预定角度，例如+ E，fra 1/2 + EE波片（15），相位延迟型棱镜（39）和组合旋转板（52） 设置在偏振光束分离器（14）和物镜（13）之间，以及光学检测元件 h检测由偏振分束器（14）偏振的光，设置在与偏振分束器（14）的相变装置相交的一侧。