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    Optical detector, optical pickup and optical information reproducing apparatus using optical pickup
    32.
    发明授权
    Optical detector, optical pickup and optical information reproducing apparatus using optical pickup 有权
    光学检测器，光学拾取器和使用光学拾取器的光学信息再现装置

    公开(公告)号：US06567355B2

    公开(公告)日：2003-05-20

    申请号：US09726557

    申请日：2000-12-01

    申请人： Katsuhiko Izumi ,  Kunikazu Ohnishi ,  Kenichi Shimada ,  Masayuki Inoue ,  Shinji Fujita

    发明人： Katsuhiko Izumi ,  Kunikazu Ohnishi ,  Kenichi Shimada ,  Masayuki Inoue ,  Shinji Fujita

    IPC分类号： G11B700

    CPC分类号： G11B7/131 ,  G11B7/0903 ,  G11B7/0909 ,  G11B7/0943 ,  G11B2007/0006

    摘要： An optical pickup has a semiconductor laser having two laser sources of different wavelengths disposed in the same package, one diffraction grating and one optical detector. A plurality of light reception areas each having four divisional light reception planes of a -character shape are disposed at positions where light beams reflected from an optical disc are applied. A focus error signal is generated by an astigmatism method by using independently these light reception areas and a tracking error signal is generated by a differential phase detection method by using one or both the light reception areas.

    摘要翻译： 光拾取器具有设置在相同封装中的两个具有不同波长的激光源的半导体激光器，一个衍射光栅和一个光学检测器。 多个光接收区域，每个光接收区域具有四个分开的光接收面，其具有 - 字符形状设置在从光盘反射的光束被施加的位置。 通过独立地使用这些光接收区域通过散光法产生聚焦误差信号，并且通过使用光接收区域中的一个或两个，通过差分相位检测方法生成跟踪误差信号。

    Optical head including electrical circuit which produces focus error signal and tracking error signal unaffected by variations in intensity distributions of reflected light beams
    34.
    发明授权
    Optical head including electrical circuit which produces focus error signal and tracking error signal unaffected by variations in intensity distributions of reflected light beams 失效
    光头包括产生聚焦误差信号的电路，跟踪误差信号不受反射光束强度分布变化的影响

    公开(公告)号：US06400664B1

    公开(公告)日：2002-06-04

    申请号：US09249290

    申请日：1999-02-12

    申请人： Takeshi Shimano ,  Shigeru Nakamura ,  Kunikazu Ohnishi ,  Masayuki Inoue ,  Yukio Fukui

    发明人： Takeshi Shimano ,  Shigeru Nakamura ,  Kunikazu Ohnishi ,  Masayuki Inoue ,  Yukio Fukui

    IPC分类号： G11B700

    CPC分类号： G11B7/1353 ,  G11B7/00718 ,  G11B7/0903 ,  G11B7/0909 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0943 ,  G11B7/131 ,  G11B7/1367 ,  G11B7/1381 ,  G11B2007/0006

    摘要： An optical head eliminates an disturbance which occurs in a focus error signal in association with the decentering of an optical disk when an optical spot crosses a track on a storage film surface, and in addition the optical head cancels an off-set which occurs in a tracking error signal in association with the movement of an objective lens. In the constitution of the optical head, phases of wave surfaces of ±1st order diffracted lights are shifted by an amount of &lgr;/2 with a common period by using a phase-inverted diffraction grating the phase of which is inverted with a period of D &lgr;/(2P . NA) in a radial direction of the optical disk, thus causing, on the optical disk, sub-spots to be located on the same track as a main-spot. Taking advantage of this location, focal point shift error signals of the main-spot and the sub-spots are added to each other with an appropriate gain ratio, thereby making it possible to cancel the disturbance which occurs in the focus error signal. Meanwhile, tracking error signals of the main-spot and the sub-spots according to a push-pull method are subtracted from each other with an appropriate gain ratio, thereby making it possible to cancel the off-set.

    摘要翻译： 当光点穿过存储膜表面上的轨道时，光头消除了在与光盘的偏心相关联的聚焦误差信号中发生的干扰，此外，光学头消除了发生在 与物镜的移动相关的跟踪误差信号。 在光头的结构中，±1级衍射光的波面的相位通过使用相位相反的衍射光栅以公共周期偏移量，其相位相位与D的周期反转 羔羊/（2P.NA）在光盘的径向方向上，从而在光盘上使得子点位于与主光点相同的轨道上。 利用该位置，以适当的增益比将主点和子点的焦点偏移误差信号相加，从而可以消除在聚焦误差信号中发生的干扰。 同时，以适当的增益比相减，根据推挽方法将主点和子点的跟踪误差信号相减，从而可以消除偏移。

    Optical pickup for optical disk apparatus
    35.
    发明授权
    Optical pickup for optical disk apparatus 失效
    光盘装置用光拾取器

    公开(公告)号：US6125087A

    公开(公告)日：2000-09-26

    申请号：US965448

    申请日：1997-11-06

    申请人： Kunikazu Ohnishi ,  Masayuki Inoue ,  Tohru Sasaki ,  Yukio Fukui ,  Takeshi Nakao ,  Takeshi Shimano

    发明人： Kunikazu Ohnishi ,  Masayuki Inoue ,  Tohru Sasaki ,  Yukio Fukui ,  Takeshi Nakao ,  Takeshi Shimano

    IPC分类号： G11B7/00 ,  G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135

    CPC分类号： G11B7/131 ,  G11B7/0901 ,  G11B7/123 ,  G11B7/1353 ,  G11B2007/0006 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/0943

    摘要： Disclosed is an optical pickup and an optical disc device using the same, each including a laser diode, a photo-detector having a region divided into at least six photo-detection areas, and a diffraction grating disposed between the laser diode and the photo-detector and having a region divided into four areas by cross-shaped division lines. The diffraction grating divides a light beam reflected from an optical disc into four diffracted light beams. A focus error signal in accordance with a knife edge method and two kinds of tracking error signals in accordance with a push-pull method and a differential phase detection method are detected by irradiating the light beams diffracted at the areas of the diffraction grating on the detection areas of the photo-detector and/or at boundary lines therebetween, and arithmetically operating light intensity signals obtained from the detection areas of the photo-detector. As a result, there can be realized an optical pickup and an optical disc device, each of which can be matched with various optical discs different in structure by detecting a tracking error signal in accordance with the push-pull method and a tracking error signal suitable for a read only disc using only one photo-detector. Further, in the present invention, a holographic element can be used as the diffraction grating.

    摘要翻译： 公开了一种光拾取器和使用该光拾取器的光盘装置，每个光拾取器和光盘装置均包括激光二极管，具有被划分为至少六个光检测区域的区域的光检测器，以及设置在激光二极管和光电二极管之间的衍射光栅， 并且具有通过十字形划分线划分成四个区域的区域。 衍射光栅将从光盘反射的光束分成四个衍射光束。 通过将衍射光栅衍射的光束照射在检测器上来检测根据刀刃法的聚焦误差信号和根据推挽法和差分相位检测方法的两种跟踪误差信号 光检测器的区域和/或其间的边界线，以及从光检测器的检测区域获得的算术运算光强度信号。 结果，可以实现光拾取器和光盘装置，其中的每一个可以通过根据推挽方法检测跟踪误差信号和适合的跟踪误差信号而与结构不同的各种光盘匹配 对于仅使用一个光电检测器的只读光盘。 此外，在本发明中，可以使用全息元件作为衍射光栅。

    Method of recording and reproducing digital information and apparatus therefor
    37.
    发明授权
    Method of recording and reproducing digital information and apparatus therefor 失效
    记录和再现数字信息的方法及其装置

    公开(公告)号：US4783776A

    公开(公告)日：1988-11-08

    申请号：US886413

    申请日：1986-07-17

    申请人： Masaji Ishigaki ,  Hideo Onuki ,  Yukio Fukui ,  Masayuki Inoue ,  Kunikazu Ohnishi

    发明人： Masaji Ishigaki ,  Hideo Onuki ,  Yukio Fukui ,  Masayuki Inoue ,  Kunikazu Ohnishi

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/007 ,  G11B7/013 ,  G11B7/24 ,  G11B7/30 ,  G11B7/125

    CPC分类号： G11B7/24085 ,  G11B7/004

    摘要： A digital information recording and reproducing method for significantly improving the transfer rate of digital information, comprises the steps of: forming a plurality of light beam guide tracks on a recording medium capable of multiple light-wavelength recording, the tracks being spaced apart by a predetermined pitch and each of the tracks comprising a series of pre-pits disposed in a scan direction and spaced apart by an interval longer than the diameter of a spot of a light beam for use in recording and reproducing; and recording and reproducing an information bit by changing the light beam to have a different wavelength predetermined n times in a predetermined order while the light beam is scanned by one interval of the pre-pits.

    摘要翻译： 一种用于显着提高数字信息传送速率的数字信息记录和再现方法包括以下步骤：在能够进行多次光波长记录的记录介质上形成多个光束导轨，所述轨道间隔开预定的 间距，并且每个轨道包括沿扫描方向布置的一系列预凹坑，间隔开比用于记录和再现的光束点的直径更长的间隔; 并且通过在预定凹坑的一个间隔扫描光束时以预定顺序将光束改变为具有不同波长的预定n次来记录和再现信息位。

    OPTICAL INFORMATION DEVICE AND INTERLAYER MOVEMENT METHOD IN OPTICAL INFORMATION DEVICE
    38.
    发明申请
    OPTICAL INFORMATION DEVICE AND INTERLAYER MOVEMENT METHOD IN OPTICAL INFORMATION DEVICE 审中-公开
    光信息设备中的光信息设备和中间层移动方法

    公开(公告)号：US20120127846A1

    公开(公告)日：2012-05-24

    申请号：US13293304

    申请日：2011-11-10

    申请人： Kunikazu Ohnishi

    发明人： Kunikazu Ohnishi

    IPC分类号： G11B7/1374

    CPC分类号： G11B7/08511 ,  G11B7/13925 ,  G11B2007/0006

    摘要： Provided is a method of, in movement between recording layers of an optical disc, resolving a problem caused by an increase in spherical aberration change as a result of widening of a layer interval at which the movement is made and executing appropriate interlayer movement. An upper limit value is defined for a recording layer interval at which the interlayer movement can be made, and if a layer interval from a moving-source layer to a moving-target layer is equal to or larger than the upper limit value, the interlayer movement and spherical aberration correction are once carried out where a predetermined recording layer for which a layer interval is less than the upper limit value is defined as a temporary shelter layer, and the processing is repeated with this temporary shelter layer defined as a new moving-source recording layer to thereby realize favorable interlayer movement to the target layer.

    摘要翻译： 提供了一种在光盘的记录层之间移动的方法，其解决了作为移动的层间间隔的加宽和执行适当的层间移动而导致的球面像差变化的增加所引起的问题。 对于可以进行层间移动的记录层间隔定义上限值，并且如果从移动源层到移动目标层的层间隔等于或大于上限值，则中间层 一旦执行层间隔小于上限值的预定记录层被定义为临时遮蔽层，并且将该临时遮蔽层重新定义为新的移动 - 源记录层，从而实现对目标层的有利的层间移动。

    Diffraction grating, optical pickup and optical disc device
    39.
    发明授权
    Diffraction grating, optical pickup and optical disc device 失效
    衍射光栅，光学拾取器和光盘设备

    公开(公告)号：US08149678B2

    公开(公告)日：2012-04-03

    申请号：US12417037

    申请日：2009-04-02

    申请人： Kunikazu Ohnishi

    发明人： Kunikazu Ohnishi

    IPC分类号： G11B7/135

    CPC分类号： G11B7/1353 ,  G11B2007/0013

    摘要： Undesired disturbance components leak eventually into various detection signals and reproduction signals as stray optical beams reflected from recording layers other than a reproduction layer overlap with signal beams on a light reception surface of an optical detector and interference occurs between them when an optical disc having multi-layered recording layers is reproduced. A diffraction grating having a specific grating groove pattern is arranged immediately ahead of an optical detector or in a return optical path. Such optical unit averages the disturbance components resulting from interference between a signal beam and a stray beam and can satisfactorily improve influences of leak.

    摘要翻译： 不期望的干扰分量最终会泄漏到各种检测信号和再现信号中，因为从再生层以外的记录层反射的杂散光束与光学检测器的光接收表面上的信号光束重叠，并且当具有多个光盘的光盘时， 复制分层记录层。 具有特定格栅凹槽图案的衍射光栅布置在光学检测器的正前方或者在返回光路中。 这样的光学单元平均化由信号光束和杂散光束之间的干涉导致的干扰分量，并且可以令人满意地改善泄漏的影响。

    Optical pickup device
    40.
    发明授权
    Optical pickup device 失效
    光学拾取装置

    公开(公告)号：US08081550B2

    公开(公告)日：2011-12-20

    申请号：US12608121

    申请日：2009-10-29

    申请人： Kunikazu Ohnishi ,  Kazuyoshi Yamazaki

    发明人： Kunikazu Ohnishi ,  Kazuyoshi Yamazaki

    IPC分类号： G11B7/00 ,  G11B20/18

    CPC分类号： G11B7/0917 ,  G11B7/0916 ,  G11B2007/0013

    摘要： In a multilayer disc has an increased number of recording layers) spaced by spacing from each other, a generation interval between focus error (FE) signals detected from the respective recording layers becomes small. This causes mutual interference between the FE signals and a resulting undesired offset and the like in the signals, leading to a significantly deteriorated quality of the FE signals. To avoid this, in an optical pickup device according to the present invention, detection surfaces are newly added at positions adjacent to the FE signal detection surfaces, a predetermined detection signal obtained from the newly-added detection surfaces is multiplied by a predetermined coefficient value depending on the spacing between the recording layers, and the multiplied signal is subtracted from the original FE signal. As a result, mutual interference between the FE signals can be remarkably reduced.

    摘要翻译： 在多层盘中具有增加数量的记录层），间隔彼此间隔，从各个记录层检测到的聚焦误差（FE）信号之间的产生间隔变小。 这导致FE信号之间的相互干扰和信号中产生的不期望的偏移等，导致FE信号的质量显着劣化。 为了避免这种情况，在根据本发明的光学拾取装置中，在与FE信号检测表面相邻的位置处新添加检测表面，将从新添加的检测表面获得的预定检测信号乘以预定系数值取决于 在记录层之间的间隔上，并且从原始FE信号中减去相乘的信号。 结果，可以显着地减少FE信号之间的相互干扰。