公开(公告)号：US08279723B2

公开(公告)日：2012-10-02

申请号：US12541668

申请日：2009-08-14

申请人： Morio Nakatani ,  Kenji Nagatomi ,  Yoshiyuki Matsumura ,  Seiichiro Takahashi

发明人： Morio Nakatani ,  Kenji Nagatomi ,  Yoshiyuki Matsumura ,  Seiichiro Takahashi

IPC分类号： G11B7/00

CPC分类号： G11B7/24038 ,  B82Y10/00 ,  G11B7/00736 ,  G11B7/00745 ,  G11B7/0938 ,  G11B7/1378 ,  G11B2007/0013

摘要： A recording medium includes at least one recording layer on which information is recorded by multi-photon absorption, and a servo layer disposed in a laminated direction with respect to the recording layer and having a track for guiding a beam spot of laser light having a first wavelength and a beam spot of laser light having a second wavelength along a scanning trajectory. The servo layer and the at least one recording layer constitute a set of layers, and a plurality of sets of layers is formed in the laminated direction. The servo layer is made of a material having a high reflectance with respect to laser light having a third wavelength for generating a servo signal, and low reflectances with respect to the laser light having the first wavelength and the laser light having the second wavelength.

摘要翻译： 记录介质包括至少一个记录层，其上通过多光子吸收记录信息;以及伺服层，其相对于记录层设置在层叠方向上，并且具有用于引导具有第一 波长和沿着扫描轨迹具有第二波长的激光束。 伺服层和至少一个记录层构成一组层，并且在层叠方向上形成多组层。 伺服层由相对于具有第三波长的激光具有高反射率的材料制成，用于产生伺服信号，以及相对于具有第一波长的激光和具有第二波长的激光的低反射率。

公开(公告)号：US20120002533A1

公开(公告)日：2012-01-05

申请号：US13174239

申请日：2011-06-30

申请人： Kenji Nagatomi ,  Shinsei Kasahara ,  Shigeharu Shirane ,  Masayuki Yoshie

发明人： Kenji Nagatomi ,  Shinsei Kasahara ,  Shigeharu Shirane ,  Masayuki Yoshie

IPC分类号： G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/131 ,  G11B7/1374 ,  G11B7/1378 ,  G11B2007/0006 ,  G11B2007/0013

摘要： A spectral element separates first laser light in such a manner that an area including only signal light as reflected first laser light is formed on a photodetector. The photodetector is provided with a first sensor group which is disposed at an irradiation position of signal light of the separated first laser light, and a second sensor group which receives zero-th order diffraction light of a main beam and two sub beams of second laser light that has been transmitted through the spectral element. The second sensor group includes a four-divided sensor which receives the main beam. The four-divided sensor is disposed in an area surrounded by the first sensor group. Zero-th order diffraction light of the first laser light that has been transmitted through the spectral element is irradiated onto the four-divided sensor.

摘要翻译： 光谱元件以这样的方式分离第一激光，即在光电检测器上形成仅包括作为反射的第一激光的信号光的区域。 光电检测器设置有第一传感器组，其设置在分离的第一激光的信号光的照射位置处，以及第二传感器组，其接收主光束的零级衍射光和第二激光的两个子光束 通过光谱元素传输的光。 第二传感器组包括接收主光束的四分割传感器。 四分割传感器设置在由第一传感器组包围的区域中。 通过光谱元件透射的第一激光的零级衍射光被照射到四分割传感器上。

公开(公告)号：US07903507B2

公开(公告)日：2011-03-08

申请号：US11642730

申请日：2006-12-21

申请人： Kenji Nagatomi ,  Seiji Kajiyama

发明人： Kenji Nagatomi ,  Seiji Kajiyama

IPC分类号： G11B7/00 ,  G11B1/135

CPC分类号： G11B7/13 ,  G11B7/0935 ,  G11B7/1374 ,  G11B2007/0006

摘要： An optical pickup device is provided, in which, supposing that an angle formed by the meeting of a straight line connecting a center of an optical disk and an accessing position of an HD objective lens with a diameter L of the optical disk is a track angle θ1, an oscillation angle α of an optical system including an HD laser, an HD half mirror, and an HD sensor, and a distance z of the HD objective lens are set so as to satisfy α−(θ1max+θ1min)/2=±45°, where θ1max is the track angle θ1 when the HD objective lens is positioned at an innermost circumference of the optical disk, and θ1min is the track angle θ1 when the HD objective lens is positioned at an outermost circumference of the optical disk.

摘要翻译： 提供了一种光学拾取装置，其中，假设由连接光盘中心的直线与具有光盘直径L的HD物镜的访问位置的会合形成的角度是轨道角度 ＆thetas; 1，包括HD激光器，HD半反射镜和HD传感器的光学系统的振荡角α和HD物镜的距离z被设定为满足α - （＆eta; 1max +＆Thetas ; 1min）/ 2 =±45°，其中＆amp; thetas; 1max是轨道角度＆amp; 1;当HD物镜位于光盘的最内周边时，1min是轨道角度; 1 HD物镜位于光盘的最外周。

公开(公告)号：US07852735B2

公开(公告)日：2010-12-14

申请号：US11943251

申请日：2007-11-20

申请人： Kazushi Mori ,  Katsutoshi Hibino ,  Kenji Asano ,  Kenji Nagatomi ,  Shogo Suzuki ,  Naoyuki Takagi

发明人： Kazushi Mori ,  Katsutoshi Hibino ,  Kenji Asano ,  Kenji Nagatomi ,  Shogo Suzuki ,  Naoyuki Takagi

IPC分类号： G11B7/135

CPC分类号： G11B7/131 ,  G11B7/1353

摘要： A diffraction element is disposed between a beam branching element (such as a beam splitter) and a photodetector. The diffraction element further segment an interference fringe introduced into stray light by a diffraction grating which divides a laser beam emitted from a laser beam source into a main beam and two sub-beams.

摘要翻译： 衍射元件设置在光束分支元件（例如光束分离器）和光电检测器之间。 衍射元件还通过将从激光束源发射的激光束分成主光束和两个子光束的衍射光栅进一步分割引入到杂散光中的干涉条纹。

公开(公告)号：US20100265810A1

公开(公告)日：2010-10-21

申请号：US12763565

申请日：2010-04-20

申请人： Kenji Nagatomi

发明人： Kenji Nagatomi

IPC分类号： G11B7/00

CPC分类号： G11B7/0909 ,  G11B2007/0013

摘要： An optical pickup device imparts different astigmatisms from each other to light fluxes in four light flux areas A through D 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 A through D to separate the light fluxes in the light flux areas A through D from each other. A signal light area where only signal light exists is defined on a detection surface of a photodetector. Sensing portions are arranged at a position corresponding to the signal light area. Accordingly, only the signal light is received by the sensing portions, thereby suppressing deterioration of a detection signal resulting from stray light.

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A至D中的光通量。 光拾取装置还改变光束区域A至D中的光束的传播方向，以将光通量区域A至D中的光束彼此分离。 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。 感测部分布置在对应于信号光区域的位置处。 因此，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。

公开(公告)号：US20100226235A1

公开(公告)日：2010-09-09

申请号：US12715903

申请日：2010-03-02

申请人： Kenji Nagatomi

发明人： Kenji Nagatomi

IPC分类号： G11B7/135

CPC分类号： G11B7/1376 ,  G11B7/1374 ,  G11B2007/0013 ,  G11B2007/13727

摘要： An optical pickup device radiates laser light to a disc having a plurality of recording layers in a direction of lamination. The optical pickup device includes a laser light source, a collimator lens, and an objective lens. The collimator lens changes a spread angle of the laser light emitted from the laser light source. The objective lens converges the laser light having passed through the collimator lens onto the disc. With the laser light in a parallel state having passed through the collimator lens, if a distance f between the laser light source and the collimator lens and a distance L between the collimator lens and the objective lens are in a relation of f

摘要翻译： 光学拾取装置将激光照射到具有层叠方向的多个记录层的盘上。 光学拾取装置包括激光光源，准直透镜和物镜。 准直透镜改变从激光光源发射的激光的扩展角。 物镜会聚经过准直透镜的激光到光盘上。 在激光通过准直透镜的平行状态下，如果激光光源与准直透镜之间的距离f与准直透镜与物镜之间的距离L为f

公开(公告)号：US20100182891A1

公开(公告)日：2010-07-22

申请号：US12690501

申请日：2010-01-20

申请人： Noboru Mamiya ,  Katsutoshi Hibino ,  Kenji Nagatomi

发明人： Noboru Mamiya ,  Katsutoshi Hibino ,  Kenji Nagatomi

IPC分类号： G11B7/00

CPC分类号： G11B7/094 ,  G11B7/131 ,  G11B7/1353 ,  G11B2007/0013

摘要： An optical pickup device is so configured as to change the propagating directions of light fluxes in four light flux areas defined in the periphery of an optical axis of laser light, out of the laser light reflected on a disc, to separate the four light fluxes one from the other. A signal light area where only signal light exists is defined on a detecting surface of a photodetector. Sensors for signal light is disposed at a position in the signal light area to be irradiated by the signal light, and a tracking error signal is generated based on a signal from the sensors. A direct-current component of the tracking error signal resulting from positional displacements of the sensors is cancelled by adjusting a gain of the signal from the sensor.

摘要翻译： 光学拾取装置被配置成在由光盘上反射的激光中改变在激光光轴的外围限定的四个光通量区域中的光束的传播方向，从而将四个光束1 从另一个 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。 用于信号光的传感器设置在信号光区域中由信号光照射的位置，并且基于来自传感器的信号产生跟踪误差信号。 通过调节来自传感器的信号的增益来消除由传感器的位置偏移产生的跟踪误差信号的直流分量。

公开(公告)号：US20100027405A1

公开(公告)日：2010-02-04

申请号：US12512440

申请日：2009-07-30

申请人： Kenji Nagatomi ,  Katsutoshi Hibino ,  Seiichiro Takahashi

发明人： Kenji Nagatomi ,  Katsutoshi Hibino ,  Seiichiro Takahashi

IPC分类号： G11B7/135 ,  G11B7/00

CPC分类号： G11B7/1353 ,  G11B7/08511 ,  G11B7/0909 ,  G11B7/0912 ,  G11B7/0943 ,  G11B7/0956 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1381 ,  G11B7/13927 ,  G11B2007/0013

摘要： An optical pickup apparatus is provided with an angle adjusting element. The angle adjusting element changes a propagation direction of luminous fluxes of four luminous flux regions set about an optical axis of the laser light, out of laser light reflected by a disc, and mutually disperses the luminous fluxes. A signal light region in which signal light only is present appears on a detecting surface of a photodetector. A sensor pattern for signal light is placed at a position irradiated with the signal light within this region. A sensor pattern for a spherical aberration detection is placed on an inner side of this region.

摘要翻译： 光拾取装置具有角度调节元件。 由光盘反射的激光，角度调整元件使围绕激光的光轴设置的四个光通量区域的光束的传播方向变化，并相互分散光束。 仅在光检测器的检测表面上出现仅存在信号光的信号光区域。 用于信号光的传感器图案被放置在用该区域内的信号光照射的位置。 用于球面像差检测的传感器图案被放置在该区域的内侧。

公开(公告)号：US20100027404A1

公开(公告)日：2010-02-04

申请号：US12512416

申请日：2009-07-30

申请人： Kenji Nagatomi ,  Katsutoshi Hibino

发明人： Kenji Nagatomi ,  Katsutoshi Hibino

IPC分类号： G11B7/00

CPC分类号： G11B7/0909 ,  G11B7/1356 ,  G11B7/1378 ,  G11B2007/13727

摘要： An optical pickup apparatus includes an astigmatic element, an angle adjusting element for contradicting propagation directions of luminous fluxes within four different luminous flux regions out of a reflected light, a polarization adjusting element. Two of the luminous flux regions are placed in a direction in which aligned are a set of opposite angles made by the two mutually crossing straight lines respectively parallel to a first convergence direction and a second convergence direction vertical to the first convergence direction by the astigmatic element, and the remaining two luminous flux regions are placed in a direction in which an alternate set of opposite angles are aligned. The polarization adjusting element differentiates polarization directions of luminous fluxes which are selected out of the luminous fluxes within the four luminous flux regions and which are adjacent in a peripheral direction in which the optical axis of reflected light serves as an axis.

摘要翻译： 光学拾取装置包括像散元件，用于与反射光中的四个不同光通量区域内的光束的传播方向相抵消的角度调整元件，偏振调节元件。 两个光通量区域被放置成沿着与通过散光元件分别平行于第一会聚方向和第二会聚方向的第二会聚方向的两条相互交叉的直线形成的一组相反角度的方向 并且剩余的两个光通量区域被放置在一组相反的角度对齐的方向上。 偏振调整元件使从四个光束区域内的光束中选出的与反射光的光轴成为轴的圆周方向相邻的光通量的偏振方向分离。

公开(公告)号：US07558184B2

公开(公告)日：2009-07-07

申请号：US11218783

申请日：2005-09-06

申请人： Kenji Nagatomi ,  Seiji Kajiyama ,  Tetsuhisa Hosokawa

发明人： Kenji Nagatomi ,  Seiji Kajiyama ,  Tetsuhisa Hosokawa

IPC分类号： G11B7/00

CPC分类号： G11B7/1275 ,  G11B7/0901 ,  G11B7/0909 ,  G11B7/1353 ,  G11B2007/0006

摘要： Provided is an optical pickup device capable to suppress an occurrence of an aberration on a recording medium and a decrease of power of laser beams while employing a diffraction grating as an optical axis correction element.The laser element emitting the laser beam for CD (780 nm in wavelength) is disposed between the laser element emitting the laser beam for next-generation DVD (405 nm in wavelength) and the laser element emitting the laser beam for DVD (650 nm in wavelength). Only the laser beam for DVD is aligned by a diffraction effect of the optical axis correction element (diffraction grating) with the optical axis of the laser beam for next generation DVD. It is possible that a decrease of laser power due to diffraction efficiency is suppressed as much as possible because only the optical axis of the laser beam for DVD is aligned with the optical axis of the laser beam for next-generation DVD. Also it is possible that the optical axis of the laser beam for CD not subjected to the optical axis correction is brought close to the optical axis of laser beam for next-generation DVD considerably, thereby an aberration occurring in the laser beam for CD can be suppressed at minimum level.

摘要翻译： 提供了一种能够抑制记录介质上的像差的发生，并且在使用衍射光栅作为光轴校正元件的同时降低激光束的功率的光学拾取装置。 发射用于CD（780nm波长）的激光束的激光元件设置在发射用于下一代DVD（波长405nm）的激光束的激光元件和用于DVD发射激光束的激光元件（650nm 波长）。 只有用于DVD的激光束通过光轴校正元件（衍射光栅）的衍射效应与用于下一代DVD的激光束的光轴对准。 可能的是，尽可能地抑制由于衍射效率引起的激光功率的降低，因为仅用于DVD的激光束的光轴与用于下一代DVD的激光束的光轴对准。 另外，用于没有进行光轴校正的CD的激光束的光轴可能显着地接近用于下一代DVD的激光束的光轴，由此在CD的激光束中发生的像差可以是 被抑制在最低水平。