公开(公告)号：US08462596B2

公开(公告)日：2013-06-11

申请号：US13511017

申请日：2010-11-24

申请人： Yuichi Takahashi ,  Kazuo Momoo ,  Hiroaki Matsumiya ,  Jun-ichi Asada

发明人： Yuichi Takahashi ,  Kazuo Momoo ,  Hiroaki Matsumiya ,  Jun-ichi Asada

IPC分类号： G11B7/00

CPC分类号： G11B7/131 ,  G11B7/0903 ,  G11B7/1353 ,  G11B7/1381 ,  G11B2007/0013

摘要： When performing recording/reproduction of information for a given recording layer of an optical disc having three recording layers, influences of reflected light from other recording layers are reduced or removed, thus making it possible to obtain a more stable RF signal or focus error signal.An optical pickup device includes a light source, a collimator lens, an objective lens, a photodetector, and a light shielding member. Among the recording layers of the optical disc, a first layer and a second layer adjoining each other are disposed in the order of the first layer and second layer from near the objective lens. The light shielding member is disposed at a position satisfying the condition d>d1 to block a part of reflected light from the second layer when light is converged on the first layer, where d is an optical path length from the photodetector to the light shielding member; and d1 is a distance from the photodetector to a position at which reflected light from the second layer becomes focused between the collimator lens and the photodetector.

摘要翻译： 当对具有三个记录层的光盘的给定记录层执行信息的记录/再现时，减少或去除来自其它记录层的反射光的影响，从而可以获得更稳定的RF信号或聚焦误差信号。 光学拾取装置包括光源，准直透镜，物镜，光电检测器和遮光构件。 在光盘的记录层中，邻接的第一层和第二层以物镜附近的第一层和第二层的顺序设置。 光遮蔽构件设置在满足条件d> d1的位置，以便当光聚焦在第一层上时阻挡来自第二层的反射光的一部分，其中d是从光电检测器到遮光构件的光路长度 ; d1是从光电检测器到第二层的反射光在准直透镜和光电检测器之间聚焦的位置的距离。

公开(公告)号：US20120287766A1

公开(公告)日：2012-11-15

申请号：US13511017

申请日：2010-11-24

申请人： Yuichi Takahashi ,  Kazuo Momoo ,  Hiroaki Matsumiya ,  Jun-ichi Asada

发明人： Yuichi Takahashi ,  Kazuo Momoo ,  Hiroaki Matsumiya ,  Jun-ichi Asada

IPC分类号： G11B7/135 ,  G11B20/10

CPC分类号： G11B7/131 ,  G11B7/0903 ,  G11B7/1353 ,  G11B7/1381 ,  G11B2007/0013

摘要： When performing recording/reproduction of information for a given recording layer of an optical disc having three recording layers, influences of reflected light from other recording layers are reduced or removed, thus making it possible to obtain a more stable RF signal or focus error signal.An optical pickup device includes a light source, a collimator lens, an objective lens, a photodetector, and a light shielding member. Among the recording layers of the optical disc, a first layer and a second layer adjoining each other are disposed in the order of the first layer and second layer from near the objective lens. The light shielding member is disposed at a position satisfying the condition d>d1 to block a part of reflected light from the second layer when light is converged on the first layer, where d is an optical path length from the photodetector to the light shielding member; and d1 is a distance from the photodetector to a position at which reflected light from the second layer becomes focused between the collimator lens and the photodetector.

摘要翻译： 当对具有三个记录层的光盘的给定记录层执行信息的记录/再现时，减少或去除来自其它记录层的反射光的影响，从而可以获得更稳定的RF信号或聚焦误差信号。 光学拾取装置包括光源，准直透镜，物镜，光电检测器和遮光构件。 在光盘的记录层中，邻接的第一层和第二层以物镜附近的第一层和第二层的顺序设置。 光遮蔽构件设置在满足条件d> d1的位置，以便当光聚焦在第一层上时阻挡来自第二层的反射光的一部分，其中d是从光电检测器到遮光构件的光路长度 ; d1是从光电检测器到第二层的反射光在准直透镜和光电检测器之间聚焦的位置的距离。

公开(公告)号：US20120117580A1

公开(公告)日：2012-05-10

申请号：US13100327

申请日：2011-05-04

申请人： Jun-ichi Asada ,  Hiroaki Matsumiya ,  Kazuo Momoo

发明人： Jun-ichi Asada ,  Hiroaki Matsumiya ,  Kazuo Momoo

IPC分类号： G11B7/135 ,  G11B19/20

CPC分类号： G11B7/1353 ,  G11B7/0903 ,  G11B7/131 ,  G11B7/1374 ,  G11B7/1395 ,  G11B2007/0006

摘要： According to the present invention, a tracking error signal can be obtained with good stability by the three-beam differential push-pull method even if the track guide groove direction of the optical disc changes as viewed from the objective lens.An optical pickup 30 according to the present invention includes: a grating element 110 for splitting light emitted from a light source 121 into multiple light beams including zero-order, −first-order and +first-order diffracted light beams; an objective lens 118 for condensing the zero-order and ±first-order diffracted light beams, which have come from the grating element 110, onto an optical disc; and a photosensor 101 with multiple photodetectors for receiving respectively the three diffracted light beams reflected from the optical disc. The grating element 110 is designed so that when measured perpendicularly to tracks on the disc, sub-light beam spots formed on the disc by the ±first-order diffracted light beams are larger than a main light beam spot formed on the disc by the zero-order diffracted light beam.

摘要翻译： 根据本发明，即使从物镜观察光盘的轨道引导槽方向变化，也可以通过三光束差分推挽法获得具有良好稳定性的跟踪误差信号。 根据本发明的光拾取器30包括：光栅元件110，用于将从光源121发射的光分成包括零级，一级和+一级衍射光束的多个光束; 用于将来自光栅元件110的零级和±一级衍射光束聚光到光盘上的物镜118; 以及具有多个光电检测器的光传感器101，用于分别接收从光盘反射的三个衍射光束。 光栅元件110被设计成使得当垂直于盘上的轨道测量时，通过±一级衍射光束在盘上形成的子光束点大于通过零点形成在盘上的主光束点 级衍射光束。

公开(公告)号：US08619522B2

公开(公告)日：2013-12-31

申请号：US13535633

申请日：2012-06-28

申请人： Yuichi Takahashi ,  Kazuo Momoo ,  Jun-ichi Asada

发明人： Yuichi Takahashi ,  Kazuo Momoo ,  Jun-ichi Asada

IPC分类号： G11B7/00

CPC分类号： G11B7/00458 ,  G11B7/003 ,  G11B7/133 ,  G11B7/1353

摘要： In one embodiment, an optical pickup includes an optical system which forms multiple light beams based on the light emitted from a light source and which converges a write beam and a read beam, thereby forming a main spot and a sub-spot, respectively, on an optical storage medium. This optical system converges the write and read beams onto the optical storage medium so that the main spot moves through the same region on the optical storage medium ahead of the sub-spot. The optical pickup further includes a detector for sensing the write and read beams reflected from the storage medium. The detector includes a first photodiode 10 that receives the reflected light from the main spot 50R on the storage medium and a second photodiode 11 that receives a portion of the reflected light from the sub-spot 51R.

摘要翻译： 在一个实施例中，光学拾取器包括基于从光源发射的光形成多个光束并且会聚写入光束和读取光束的光学系统，从而分别形成主光点和子光点 光学存储介质。 该光学系统将写入和读取光束会聚到光学存储介质上，使得主光点移动到子光点之前的光学存储介质上的相同区域。 光学拾取器还包括用于感测从存储介质反射的写入和读出光束的检测器。 检测器包括接收来自存储介质上的主光斑50R的反射光的第一光电二极管10和接收来自子光点51R的一部分反射光的第二光电二极管11。

公开(公告)号：US08659985B2

公开(公告)日：2014-02-25

申请号：US13398934

申请日：2012-02-17

申请人： Jun-ichi Asada ,  Kazuo Momoo ,  Yohichi Saitoh

发明人： Jun-ichi Asada ,  Kazuo Momoo ,  Yohichi Saitoh

IPC分类号： G11B7/1353 ,  G11B7/1263

CPC分类号： G11B7/00458 ,  G11B7/003 ,  G11B7/1353

摘要： In one embodiment of the present invention, an optical pickup for writing and reading data on an optical storage medium comprises a diffractive element for diffracting a light beam to split it into multiple light beams. The diffracted light beams includes a zero-order diffracted light beam for writing data on a track of the land or the groove of the optical storage medium and non-zero-order diffracted light beams for reading the data from the track. The diffractive element has first and second diffraction gratings that have mutually different grating vector directions and pitches. The first diffraction grating forms light beam spots on the same track by the non-zero-order and zero-order diffracted light beams. The second diffraction grating forms a light beam spot to extend to both sides of said track, or forms a light beam spot on one side of said track, by the non-zero-order diffracted light beams.

摘要翻译： 在本发明的一个实施例中，用于在光学存储介质上写入和读取数据的光学拾取器包括用于衍射光束以将其分成多个光束的衍射元件。 衍射光束包括用于在光存储介质的焊盘或凹槽的轨道上写入数据的零级衍射光束和用于从轨道读取数据的非零级衍射光束。 衍射元件具有第一和第二衍射光栅，其具有相互不同的光栅矢量方向和间距。 第一衍射光栅通过非零级和零级衍射光束在同一轨道上形成光束点。 第二衍射光栅形成光束点，以延伸到所述轨道的两侧，或者通过非零级衍射光束在所述轨道的一侧上形成光束点。

公开(公告)号：US20090034401A1

公开(公告)日：2009-02-05

申请号：US12183250

申请日：2008-07-31

申请人： Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke Kanda

发明人： Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke Kanda

IPC分类号： G11B7/135 ,  B05D5/06 ,  C08F2/48

CPC分类号： G11B7/1365 ,  G11B7/1353 ,  G11B7/1381

摘要： It is intended to provide an optical disk apparatus which detects a light amount greater than zero even when used in conjunction with an optical disk substrate having a large birefringence, so that it is possible to properly read a signal without errors and properly perform optical disk controls. The optical disk apparatus includes: a light source for emitting light; an objective lens for converging the light onto a signal surface of an optical disk; a polarized beam diffraction element for diffracting the light reflected from the optical disk; a photodetector for detecting the light diffracted from the polarized beam diffraction element; and a wavelength plate disposed between the optical disk and the polarized beam diffraction element. The wavelength plate has a two-dimensional array of a plurality of birefringent regions including first and second regions, the first and second regions differing in birefringent phase difference and/or optic axes from each other, and the plurality of birefringent regions including the first and second regions cause the light to have different polarization states.

摘要翻译： 即使在与具有大双折射性的光盘基板结合使用的情况下，也能够提供大于零的光量的光盘装置，从而可以正确地读取无误信号，适当地执行光盘控制 。 光盘装置包括：用于发光的光源; 用于将光聚焦到光盘的信号表面上的物镜; 用于衍射从光盘反射的光的偏振光束衍射元件; 用于检测从偏振光束衍射元件衍射的光的光检测器; 以及布置在光盘和偏振光束衍射元件之间的波长板。 波长板具有包括第一和第二区域的多个双折射区域的二维阵列，第一和第二区域在双折射相位差和/或光轴上彼此不同，并且多个双折射区域包括第一和第二区域 第二区域导致光具有不同的偏振状态。

公开(公告)号：US07796491B2

公开(公告)日：2010-09-14

申请号：US11237197

申请日：2005-09-28

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

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

IPC分类号： G11B7/135

CPC分类号： G11B7/1365 ,  G11B7/1369 ,  G11B2007/0006

摘要： There is provided, in an optical disk apparatus which is capable of recording data to or reading data from a plurality of types of optical disks, a wavelength plate and an optical pickup which can reduce deterioration in signal quality even in the presence of a large birefringence of the substrate of an optical disk. A wavelength plate 6 according to the present invention is a wavelength plate to be placed in an optical path through which rays of a plurality of wavelengths travel back and forth, the plurality of wavelengths including a ray having a wavelength λ. The wavelength plate includes a two-dimensional array of a plurality of birefringent regions, the birefringent regions including first regions D1 and second regions D2 having different optic axis directions from each other. The relationship 240°≦Δ1≦300° is true, where Δ1 is a retardation of the wavelength plate 6 for the ray of the wavelength λ.

摘要翻译： 在能够将数据记录到或从多种类型的光盘读取数据的光盘装置中，提供了即使存在大的双折射也能够降低信号质量劣化的波长板和光学拾取器 的光盘的基板。 根据本发明的波长板6是放置在多个波长的光线前后移动的光路中的波长板，多个波长包括具有波长λ的射线。 波长板包括多个双折射区域的二维阵列，双折射区域包括彼此具有不同光轴方向的第一区域D1和第二区域D2。 240°＆nlE;＆Dgr; 1＆nlE; 300°的关系为真，其中＆Dgr; 1为波长λ的波长的波长板6的延迟。

公开(公告)号：US20060077858A1

公开(公告)日：2006-04-13

申请号：US11237197

申请日：2005-09-28

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

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

IPC分类号： G11B7/00

CPC分类号： G11B7/1365 ,  G11B7/1369 ,  G11B2007/0006

摘要： There is provided, in an optical disk apparatus which is capable of recording data to or reading data from a plurality of types of optical disks, a wavelength plate and an optical pickup which can reduce deterioration in signal quality even in the presence of a large birefringence of the substrate of an optical disk. A wavelength plate 6 according to the present invention is a wavelength plate to be placed in an optical path through which rays of a plurality of wavelengths travel back and forth, the plurality of wavelengths including a ray having a wavelength λ. The wavelength plate includes a two-dimensional array of a plurality of birefringent regions, the birefringent regions including first regions D1 and second regions D2 having different optic axis directions from each other. The relationship 240°≦Δ1≦300° is true, where Δ1 is a retardation of the wavelength plate 6 for the ray of the wavelength λ.

摘要翻译： 在能够将数据记录到或从多种类型的光盘读取数据的光盘装置中，提供了即使存在大的双折射也能够降低信号质量劣化的波长板和光学拾取器 的光盘的基板。 根据本发明的波长板6是放置在多个波长的光线前后移动的光路中的波长板，多个波长包括具有波长λ的射线。 波长板包括多个双折射区域的二维阵列，双折射区域包括具有与每个双折射区域不同的光轴方向的第一区域D 1 1和第二区域D 2＆lt; 2＆gt; 其他。 对于波长λ的光线，相位差240°<=> 1°<= 300°为真，其中Δ1≤1是波长板6的延迟。

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：US07463569B2

公开(公告)日：2008-12-09

申请号：US11112998

申请日：2005-04-22

申请人： Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke Kanda

发明人： Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke Kanda

IPC分类号： G11B7/00

CPC分类号： G11B7/1365 ,  G11B7/1353 ,  G11B7/1381

摘要： It is intended to provide an optical disk apparatus which detects a light amount greater than zero even when used in conjunction with an optical disk substrate having a large birefringence, so that it is possible to properly read a signal without errors and properly perform optical disk controls. The optical disk apparatus includes: a light source for emitting light; an objective lens for converging the light onto a signal surface of an optical disk; a polarized beam diffraction element for diffracting the light reflected from the optical disk; a photodetector for detecting the light diffracted from the polarized beam diffraction element; and a wavelength plate disposed between the optical disk and the polarized beam diffraction element. The wavelength plate has a two-dimensional array of a plurality of birefringent regions including first and second regions, the first and second regions differing in birefringent phase difference and/or optic axes from each other, and the plurality of birefringent regions including the first and second regions cause the light to have different polarization states.

摘要翻译： 即使在与具有大双折射性的光盘基板结合使用的情况下，也能够提供大于零的光量的光盘装置，从而可以正确地读取无误信号，适当地执行光盘控制 。 光盘装置包括：用于发光的光源; 用于将光聚焦到光盘的信号表面上的物镜; 用于衍射从光盘反射的光的偏振光束衍射元件; 用于检测从偏振光束衍射元件衍射的光的光检测器; 以及布置在光盘和偏振光束衍射元件之间的波长板。 波长板具有包括第一和第二区域的多个双折射区域的二维阵列，第一和第二区域在双折射相位差和/或光轴上彼此不同，并且多个双折射区域包括第一和第二区域 第二区域导致光具有不同的偏振状态。