公开(公告)号：US06930972B2

公开(公告)日：2005-08-16

申请号：US10617084

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：US06819647B2

公开(公告)日：2004-11-16

申请号：US10617168

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： 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.

公开(公告)号：US08000184B2

公开(公告)日：2011-08-16

申请号：US12598779

申请日：2008-04-17

申请人： Jun-iti Asada ,  Seiji Nishiwaki ,  Kazuo Momoo

发明人： Jun-iti Asada ,  Seiji Nishiwaki ,  Kazuo Momoo

IPC分类号： G11B7/00

CPC分类号： G11B7/094 ,  G11B7/1275 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1381 ,  G11B2007/0006 ,  G11B2007/13727

摘要： When first-order diffracted beams leak into a region, which is for receiving only a zeroth-order diffracted beam from an optical disc, due to positional displacement between an objective lens and a hologram element, an offset compensation signal includes an AC component, the offset compensation signal preferably including a DC component only. Accordingly, there may be caused deterioration in a modulation degree of the tracking error (TE) signal. A partial light shielding element 110 is formed on a hologram surface 112a along boundaries between a light receiving region (121a), which receives a zeroth-order diffracted beam, and light receiving regions (121b, 121c), which receive the zeroth-order diffracted beam and first-order diffracted beams, so as to cover the light receiving region (121a). Further, the partial light shielding element 110 shifts phases of transmitted light beams by π, whereby the TE signal is offset-compensated, and the modulation degree can be improved.

摘要翻译： 当一级衍射光束由于物镜和全息元件之间的位置偏移而泄漏到仅用于从光盘接收零级衍射光束的区域中时，偏移补偿信号包括AC分量， 偏移补偿信号优选仅包括DC分量。 因此，可能导致跟踪误差（TE）信号的调制度的劣化。 部分遮光元件110沿着接收零级衍射光束的光接收区域（121a）和接收零级衍射光的受光区域（121b，121c）之间的边界形成在全息图表面112a上 光束和一级衍射光束，以覆盖光接收区域（121a）。 此外，部分遮光元件110将透射光束的相位移位＆pgr，由此TE信号被偏移补偿，并且可以提高调制度。

公开(公告)号：US07468939B2

公开(公告)日：2008-12-23

申请号：US10552193

申请日：2004-04-06

申请人： Hiroaki Matsumiya ,  Seiji Nishiwaki ,  Kazuo Momoo

发明人： Hiroaki Matsumiya ,  Seiji Nishiwaki ,  Kazuo Momoo

IPC分类号： G11B7/085

CPC分类号： G11B7/0903 ,  G11B7/094 ,  G11B7/0943

摘要： An optical pickup device capable of correcting an off-tracking which is ascribable to a phase shift of a differential push-pull signal waveform, even when an optical disk or an objective lens is tilted along a radial direction of the optical disk, so that stable tracking control can be performed; and, an optical disk apparatus comprising such an optical pickup device.

摘要翻译： 即使当光盘或物镜沿着光盘的径向方向倾斜时，能够校正归因于差分推挽信号波形的相移的偏离跟踪的光拾取装置，使得稳定 可执行跟踪控制; 以及包括这种光学拾取装置的光盘装置。

公开(公告)号：US07330418B2

公开(公告)日：2008-02-12

申请号：US11072292

申请日：2005-03-07

申请人： Seiji Nishiwaki ,  Kazuo Momoo ,  Junji Nagaoka

发明人： Seiji Nishiwaki ,  Kazuo Momoo ,  Junji Nagaoka

IPC分类号： G11B7/00

CPC分类号： G11B7/24085 ,  G11B7/007 ,  G11B7/00718 ,  G11B7/0901 ,  G11B7/0943 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/1369 ,  G11B7/1381 ,  G11B7/24088

摘要： An optical disk device has a light source which emits light; and light converging means of, in each of signal mark forming regions, each of lands, or each of grooves of an optical disk, converging the light from the light source onto a signal surface of the optical disk with selectively positioning a signal mark at any one of plural positions which are arranged in a direction that is substantially perpendicular to tracks, each of the signal mark forming regions surrounded by adjacent two of boarder lines which are between two the tracks on the signal surface of the optical disk, and which are substantially parallel to the tracks, and each of which substantially divides an area between adjacent tracks in two parts.

摘要翻译： 光盘装置具有发光的光源; 以及在每个信号标记形成区域中的光会聚装置，每个光阑的凹槽或每个凹槽中，将来自光源的光会聚到光盘的信号表面上，从而选择性地将信号标记定位在任何 多个位置中的一个被布置在基本上垂直于轨道的方向上，每个信号标记形成区被围绕在光盘的信号表面上的两个轨道之间的相邻的两个边缘线包围，并且基本上 平行于轨道，并且其中的每一个在两个部分中基本上划分相邻轨道之间的区域。

公开(公告)号：US20050157634A1

公开(公告)日：2005-07-21

申请号：US11072292

申请日：2005-03-07

申请人： Seiji Nishiwaki ,  Kazuo Momoo ,  Junji Nagaoka

发明人： Seiji Nishiwaki ,  Kazuo Momoo ,  Junji Nagaoka

IPC分类号： G11B7/24 ,  G11B7/004 ,  G11B7/007 ,  G11B7/013 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/24085 ,  G11B7/007 ,  G11B7/00718 ,  G11B7/0901 ,  G11B7/0943 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1353 ,  G11B7/1369 ,  G11B7/1381 ,  G11B7/24088

摘要： An optical disk device has a light source which emits light; and light converging means of, in each of signal mark forming regions, each of lands, or each of grooves of an optical disk, converging the light from the light source onto a signal surface of the optical disk with selectively positioning a signal mark at any one of plural positions which are arranged in a direction that is substantially perpendicular to tracks, each of the signal mark forming regions surrounded by adjacent two of boarder lines which are between two the tracks on the signal surface of the optical disk, and which are substantially parallel to the tracks, and each of which substantially divides an area between adjacent tracks in two parts.

摘要翻译： 光盘装置具有发光的光源; 以及在每个信号标记形成区域中的光会聚装置，每个光阑的凹槽或每个凹槽中，将来自光源的光会聚到光盘的信号表面上，并选择性地将信号标记定位在任何 多个位置中的一个被布置在基本上垂直于轨道的方向上，每个信号标记形成区被围绕在光盘的信号表面上的两个轨道之间的相邻的两个边缘线包围，并且基本上 平行于轨道，并且其中的每一个在两个部分中基本上划分相邻轨道之间的区域。

公开(公告)号：US06822934B2

公开(公告)日：2004-11-23

申请号：US09884890

申请日：2001-06-19

申请人： Seiji Nishiwaki ,  Yoichi Saito ,  Kazuo Momoo ,  Kenji Nagashima

发明人： Seiji Nishiwaki ,  Yoichi Saito ,  Kazuo Momoo ,  Kenji Nagashima

IPC分类号： G11B700

CPC分类号： G11B7/0906 ,  G11B7/0901 ,  G11B7/0909 ,  G11B7/0943 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1356 ,  G11B7/1365 ,  G11B7/1372 ,  G11B7/1381

摘要： An optical disc apparatus capable of mounting an optical disc includes a light source for emitting light; an objective lens for collecting the light emitted by the light source on the optical disc; a first light distribution section integrally movable with the objective lens, the first light distribution section including a first area and a second area, the first light distribution section outputting the light reflected by the optical disc and transmitted through the first area or the second area as transmission light, outputting the light reflected by the optical disc and diffracted by the first area as first diffraction light, and outputting the light reflected by the optical disc and diffracted by the second area as second diffraction light; a transmission light detection section for detecting the transmission light and outputting a TE1 signal indicating an offset of the detected transmission light; a first diffraction light detection section for detecting the first diffraction light and the second diffraction light, and outputting a TE2 signal indicating a difference between a light amount of the detected first diffraction light and a light amount of the detected second diffraction light; and a control device for generating a tracking error signal for the optical disc based on the TE1 signal and the TE2 signal.

摘要翻译： 能够安装光盘的光盘装置包括用于发光的光源; 用于收集由光源在光盘上发射的光的物镜; 所述第一配光部与所述物镜一体地移动，所述第一配光部包括第一区域和第二区域，所述第一配光部输出由所述光盘反射并经由所述第一区域或所述第二区域透射的光， 透射光，输出由光盘反射并被第一区域衍射的光作为第一衍射光，并输出由光盘反射并被第二区域衍射的光作为第二衍射光; 发送光检测部，用于检测发送光并输出表示所检测的发送光的偏移的TE1信号; 第一衍射光检测部分，用于检测第一衍射光和第二衍射光，并输出指示检测到的第一衍射光的光量与检测到的第二衍射光的光量之间的差的TE2信号; 以及用于基于TE1信号和TE2信号产生用于光盘的跟踪误差信号的控制装置。

公开(公告)号：US08045432B2

公开(公告)日：2011-10-25

申请号：US12296822

申请日：2007-03-19

申请人： Seiji Nishiwaki ,  Kazuo Momoo ,  Junichi Asada

发明人： Seiji Nishiwaki ,  Kazuo Momoo ,  Junichi Asada

IPC分类号： G11B7/00

CPC分类号： G11B7/0903 ,  G11B7/094 ,  G11B7/131 ,  G11B7/1353

摘要： Light emitted from a radiation light source 1 passes through a diffraction grating 3a and is separated into transmitted light a and +1st/−1st order diffracted lights b, c. These lights are collected through an objective lens 7 on tracks of an optical disc 8 in a partially overlapped state. Light reflected by the tracks passes through the objective lens 7 and is incident upon light diverging means 13a. Subsequently, light corresponding to the transmitted light “a” diverges into two light beams that are respectively incident upon light detection regions A1, A2, light corresponding to the diffracted lights “b” and “c” respectively diverges into two light beams that are respectively incident upon light detection regions B1, B2, and C1, C2. A tracking error signal associated with the tracks of the optical disc 8 is generated by combining signals detected in the light detection regions A1, A2, B1, B2, C1, and C2.

摘要翻译： 从辐射光源1发射的光通过衍射光栅3a并分离为透射光a和+ 1 / -1级衍射光b，c。 这些光以部分重叠的状态通过物镜7收集在光盘8的轨道上。 由轨道反射的光通过物镜7并入射到光发散装置13a上。 随后，对应于透射光“a”的光分散入分别入射到光检测区域A1，A2的两个光束，分别对应于衍射光“b”和“c”的光分别发散成两个光束 入射到光检测区域B1，B2和C1，C2。 通过组合在光检测区域A1，A2，B1，B2，C1和C2中检测到的信号来产生与光盘8的轨道相关联的跟踪误差信号。

公开(公告)号：US07911926B2

公开(公告)日：2011-03-22

申请号：US12090268

申请日：2006-09-19

申请人： Seiji Nishiwaki ,  Kazuo Momoo

发明人： Seiji Nishiwaki ,  Kazuo Momoo

IPC分类号： G11B7/00

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

摘要： A tracking error signal is generated with stability without being easily affected by a distribution fluctuation of light reflected from an optical disc or by a lens shift.An optical disc drive according to the present invention includes: an objective lens 5 with an aperture radius r0 for converging a light beam emitted from a light source 1; a polarizing hologram substrate 2 for dividing the beam reflected from the optical disc 6 into branched light beams; a photodetector substrate 6, on which at least some of the light beams are incident to generate signals representing the intensities of the light beams; and a shielding mask 16 for cutting off the beam partially. If xy coordinates are defined on a virtual plane, passing the center of the lens 5 and intersecting with the optical axis 7 at right angles, such that an x-axis is parallel to the disc radial direction and a y-axis crosses the x-axis at right angles, the shielding mask 16 prevents the beam from passing through areas of the virtual plane defined by coordinates (x, y) satisfying |x|>a, |y|>b and a2+b2

摘要翻译： 产生稳定的跟踪误差信号，而不会受到由光盘反射的光的分布波动或透镜偏移的影响。 根据本发明的光盘驱动器包括：具有用于会聚从光源1发射的光束的孔径半径r0的物镜5; 用于将从光盘6反射的光束分成分支光束的偏振全息图基板2; 光检测器基板6，其中至少一些光束入射以产生表示光束强度的信号; 以及用于部分切断光束的遮光罩16。 如果在虚拟平面上定义xy坐标，则使透镜5的中心与光轴7成直角相交，使得x轴平行于圆盘径向，并且y轴与x轴交叉， 屏蔽掩模16防止光束通过由满足| x |> a，| y |> b和a2 + b2

公开(公告)号：US20090238051A1

公开(公告)日：2009-09-24

申请号：US12090268

申请日：2006-09-19

申请人： Seiji Nishiwaki ,  Kazuo Momoo

发明人： Seiji Nishiwaki ,  Kazuo Momoo

IPC分类号： G11B20/10

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

摘要： A tracking error signal is generated with stability without being easily affected by a distribution fluctuation of light reflected from an optical disc or by a lens shift.An optical disc drive according to the present invention includes: an objective lens 5 with an aperture radius r0 for converging a light beam emitted from a light source 1; a polarizing hologram substrate 2 for dividing the beam reflected from the optical disc 6 into branched light beams; a photodetector substrate 6, on which at least some of the light beams are incident to generate signals representing the intensities of the light beams; and a shielding mask 16 for cutting off the beam partially. If xy coordinates are defined on a virtual plane, passing the center of the lens 5 and intersecting with the optical axis 7 at right angles, such that an x-axis is parallel to the disc radial direction and a y-axis crosses the x-axis at right angles, the shielding mask 16 prevents the beam from passing through areas of the virtual plane defined by coordinates (x, y) satisfying |x|>a, |y|>b and a2+b2

摘要翻译： 产生稳定的跟踪误差信号，而不会受到由光盘反射的光的分布波动或透镜偏移的影响。 根据本发明的光盘驱动器包括：具有用于会聚从光源1发射的光束的孔径半径r0的物镜5; 用于将从光盘6反射的光束分成分支光束的偏振全息图基板2; 光检测器基板6，其中至少一些光束入射以产生表示光束强度的信号; 以及用于部分切断光束的遮光罩16。 如果在虚拟平面上定义xy坐标，则使透镜5的中心与光轴7成直角相交，使得x轴平行于圆盘径向，并且y轴与x轴交叉， 屏蔽掩模16防止光束通过由满足| x |> a，| y |> b和a2 + b2