公开(公告)号：US20140043950A1

公开(公告)日：2014-02-13

申请号：US14114059

申请日：2012-02-17

申请人： Masayuki Omaki ,  Kenya Nakai ,  Nobuo Takeshita

发明人： Masayuki Omaki ,  Kenya Nakai ,  Nobuo Takeshita

IPC分类号： G11B20/10

CPC分类号： G11B20/10222 ,  G11B20/10037 ,  G11B20/10046 ,  G11B20/10055 ,  G11B20/1012 ,  G11B20/1024 ,  G11B20/10277 ,  G11B20/10462 ,  G11B2220/2537

摘要： Provided is a signal processing device including: an adaptive filter; a PRML circuit for sequentially generating binarized data from a filtered reproduced waveform by sampling at sampling points in a period based on a clock signal and sequentially generating a partial response waveform which is to be the target waveform from the binarized data; a calculating unit for sequentially calculating first phase errors from a difference between the target waveform and the filtered reproduced waveform; a limiting unit for outputting second phase errors by excluding a specific phase error from the first phase errors; and a clock generating unit for generating the clock signal of a frequency corresponding to the second phase errors; wherein the specific phase error includes a phase error at a time when the partial response waveform reaches a specific level which excludes at least a level not less than a predetermined amplitude level.

摘要翻译： 提供一种信号处理装置，包括：自适应滤波器; PRML电路，用于基于时钟信号在一个周期的采样点采样从所滤波的再现波形顺序地生成二值化数据，并从二值化数据顺序地产生作为目标波形的部分响应波形; 计算单元，用于从目标波形和滤波的再现波形之间的差顺序地计算第一相位误差; 限制单元，用于通过从第一相位误差排除特定相位误差来输出第二相位误差; 以及时钟产生单元，用于产生与第二相位误差对应的频率的时钟信号; 其中所述特定相位误差包括当所述部分响应波形达到排除至少不小于预定幅度电平的电平的特定电平时的相位误差。

公开(公告)号：US08339909B2

公开(公告)日：2012-12-25

申请号：US13258538

申请日：2010-05-21

申请人： Kenya Nakai ,  Masayuki Ohmaki ,  Nobuo Takeshita

发明人： Kenya Nakai ,  Masayuki Ohmaki ,  Nobuo Takeshita

IPC分类号： G11B7/00

CPC分类号： G11B7/005 ,  G11B7/131 ,  G11B20/10009 ,  G11B20/10027 ,  G11B20/10046 ,  G11B20/10222 ,  G11B20/10296 ,  G11B20/10416 ,  G11B2220/2595

摘要： A first signal is detected from the central part of a light beam returning from a super-resolution optical disc; a second signal is detected from a peripheral part in a direction corresponding to a track on the super-resolution optical disc; a gain adjustment unit is provided to adjust the amplitude of the first signal; a subtraction unit is provided to generate a third signal by subtracting, from the second signal, the first signal with the amplitude adjusted by the gain adjustment unit; and an unit is provided to generate a reproduced signal by combining the first signal and a signal obtained by delaying the third signal.

摘要翻译： 从从超分辨率光盘返回的光束的中心部分检测第一信号; 在与超分辨率光盘上的轨道对应的方向上从外围部分检测第二信号; 提供增益调整单元来调整第一信号的幅度; 减法单元被提供以通过从第二信号中减去由增益调整单元调整的幅度的第一信号来产生第三信号; 并且提供单元以通过组合第一信号和通过延迟第三信号而获得的信号来产生再现信号。

公开(公告)号：US08270264B2

公开(公告)日：2012-09-18

申请号：US12744906

申请日：2008-08-28

申请人： Kenya Nakai

发明人： Kenya Nakai

IPC分类号： G11B7/00

CPC分类号： G11B7/005 ,  G11B7/00736 ,  G11B7/131 ,  G11B7/133 ,  G11B7/24

摘要： [Object] A recoding playback apparatus and an optical disk are provided that allows reduction of a low frequency noise at a time of playback of a super resolution optical disk including small record marks whose size is below the diffractive limitation, to enhance quality of a playback signal.[Means for Solution] The reflective beams from the optical disk are received by dividing into outer portion beams and a center portion beam, and a playback signal is created by combining such beams based on respective different gains. Based on received amounts of light or amounts of low frequency noise in respective light receiving regions, adjustment or determination of gain values is made, or the optical head apparatus is optically adjusted, whereby the low frequency noise is optimally suppressed. Further, a specific region is provided on the optical disk for making the foregoing adjustment.

摘要翻译： 提供了一种重新编码回放装置和光盘，其允许在包括尺寸低于衍射限制的小记录标记的超分辨率光盘的播放时降低低频噪声，以提高播放质量 信号。 解决方案通过分为外部光束和中心部分光束来接收来自光盘的反射光束，并且通过基于相应的不同增益组合这些光束来创建重放信号。 基于各光接收区域的接收光量或低频噪声量，进行增益值的调整或确定，或光学头装置的光学调整，从而最佳地抑制低频噪声。 此外，在光盘上设置特定区域进行上述调整。

公开(公告)号：US20100226233A1

公开(公告)日：2010-09-09

申请号：US12717410

申请日：2010-03-04

申请人： Noritaka TANABE ,  Daisuke Matsubara ,  Kenya Nakai

发明人： Noritaka TANABE ,  Daisuke Matsubara ,  Kenya Nakai

IPC分类号： G11B7/135

CPC分类号： G11B7/1362 ,  G11B7/1275 ,  G11B7/22 ,  G11B2007/0006

摘要： An optical pickup device includes a first optical system and a second optical system. The first optical system and the second optical system each include a mirror member that reflects light from a light source to change a direction of propagation of the light to a direction substantially perpendicular to the information storage surface of an optical disc. The first optical system and the second optical system are arranged such that a direction in which light from a first light source enters a first mirror member is substantially perpendicular to a direction in which light from a second light source enters a second mirror member.

摘要翻译： 光拾取装置包括第一光学系统和第二光学系统。 第一光学系统和第二光学系统各自包括反射来自光源的光以将光的传播方向改变到基本上垂直于光盘的信息存储表面的方向的反射镜部件。 第一光学系统和第二光学系统被布置成使得来自第一光源的光进入第一镜构件的方向基本上垂直于来自第二光源的光进入第二镜构件的方向。

公开(公告)号：US20100214903A1

公开(公告)日：2010-08-26

申请号：US12738549

申请日：2008-08-22

申请人： Kenya Nakai

发明人： Kenya Nakai

IPC分类号： G11B7/135 ,  G02B27/28 ,  G01D5/34

CPC分类号： G11B7/1369 ,  G11B7/0909 ,  G11B7/094 ,  G11B7/131 ,  G11B7/1365 ,  G11B7/1381 ,  G11B2007/0013

摘要： An object of the present invention is to provide an extraction optical system capable of separating and extracting a signal light and a stray light with a simple configuration, and an optical head device including the same. A phase plate and a phase plate are +λ/4 phase plates, while a phase plate and a phase plate are −λ/4 phase plates. A focal line, a focal line and a focal line represent a focal line of a stray light, a focal line of a reproduction light and a focal line of a stray light, respectively. All beams of the reproduction light enter the state in which a polarization direction is rotated by 90 degrees after passing through the phase element. In contrast to the all light bundles of the reproduction light, polarization directions of all light bundles of the stray lights and are not rotated even after passing through the phase element.

摘要翻译： 本发明的目的是提供一种能够以简单的结构分离和提取信号光和杂散光的提取光学系统，以及包括该提取光学系统的光学头装置。 相位板和相位板是+λ/ 4相位板，相位板和相位板是-λ/ 4相位板。 焦线，焦线和焦线分别表示杂散光的焦线，再现光的焦线和杂散光的焦线。 再现光的所有光进入通过相位元件之后极化方向旋转90度的状态。 与再现光的全部光束相反，杂散光的所有光束的偏振方向，即使在通过相位元件之后也不会旋转。

公开(公告)号：US20100097917A1

公开(公告)日：2010-04-22

申请号：US12513616

申请日：2008-02-19

申请人： Masahisa Shinoda ,  Daisuke Matsubara ,  Kenya Nakai ,  Hironori Nakahara

发明人： Masahisa Shinoda ,  Daisuke Matsubara ,  Kenya Nakai ,  Hironori Nakahara

IPC分类号： G11B7/00

CPC分类号： G02B5/1861 ,  G02B5/1819 ,  G02B5/1842 ,  G02B26/0808 ,  G11B7/1353 ,  G11B7/1381 ,  G11B2007/0006

摘要： An optical pickup with a simplified structure in which, according to the type of optical disc, diffracted light from three types of laser light can be directed efficiently onto a photodetector and appropriate focus control can be performed based on the signals detected by the photodetector, and a diffractive optical element that can be used in the optical pickup, which has a semiconductor laser 10 that can emit three types of laser light, a diffractive optical element 42 that diffracts the laser light reflected from the optical disc 31, and a single photodetector 43 that detects the diffracted light exiting the diffractive optical element 42. The diffractive optical element 42 is structured so that 0-order light is the maximal component of the diffracted light generated from each of two of three types of laser light, the two having close wavelengths (with a small wavelength difference), and +1-order light or −1-order light is the maximal component of the diffracted light generated from the remaining one type of laser light.

摘要翻译： 具有简化结构的光学拾取器，其中根据光盘的类型，可以将来自三种类型的激光的衍射光有效地引导到光电检测器上，并且可以基于由光电检测器检测的信号执行适当的聚焦控制，以及 可以用于具有能够发射三种激光的半导体激光器10的光学拾取器中的衍射光学元件，衍射从光盘31反射的激光的衍射光学元件42和单个光电检测器43 它检测离开衍射光学元件42的衍射光。衍射光学元件42被构造成使得0级光是从三种类型的激光中的两种中的两种中的每一种产生的衍射光的最大分量，其中两个具有接近的波长 （具有小的波长差），+ 1次光或-1次光是衍射光产生的最大分量fr 剩下的一种类型的激光。

公开(公告)号：US07266072B2

公开(公告)日：2007-09-04

申请号：US10976811

申请日：2004-11-01

申请人： Masahisa Shinoda ,  Kenya Nakai

发明人： Masahisa Shinoda ,  Kenya Nakai

IPC分类号： G11B7/00

CPC分类号： G11B7/1275 ,  G11B7/082 ,  G11B7/22 ,  H01S5/02212 ,  H01S5/02268 ,  H01S5/02296 ,  H01S5/4031 ,  H01S5/4087

摘要： A semiconductor laser unit includes a plurality of semiconductor laser elements arranged parallel with one another in a laser beam-emitting direction, and a base for positioning and fixing the plurality of semiconductor laser elements. The plurality of semiconductor laser elements are arranged such that a laser beam emitted from the semiconductor laser element greatest in astigmatism, of the plurality of semiconductor laser elements, is coincident in its axis with a reference axis of the base. In the case that the semiconductor laser unit is arranged on an optical head device, the focusing characteristic on the plurality of laser beams can be improved.

摘要翻译： 半导体激光单元包括在激光束发射方向上彼此平行布置的多个半导体激光元件和用于定位和固定多个半导体激光元件的基底。 多个半导体激光元件被布置成使得从多个半导体激光元件中以散光最大的半导体激光元件发射的激光束在其轴线与基座的参考轴线重合。 在半导体激光单元配置在光学头装置上的情况下，可以提高多个激光束的聚焦特性。

公开(公告)号：US08971163B2

公开(公告)日：2015-03-03

申请号：US13995625

申请日：2012-01-06

申请人： Kenya Nakai ,  Masayuki Omaki

发明人： Kenya Nakai ,  Masayuki Omaki

IPC分类号： G11B7/126 ,  G11B7/1263 ,  G11B7/26 ,  G11B7/1376 ,  G11B7/24065 ,  G11B7/00

CPC分类号： G11B7/1263 ,  G11B7/1376 ,  G11B7/24065 ,  G11B7/268 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical disc device uses an optical disc (6) capable of super-resolution reproduction, and includes a semiconductor laser (1), a laser driving circuit (21) that supplies a driving current to the semiconductor laser, a light receiving element (8) that detects return light from the optical disc (6) and obtains reproduction signal of recording data of the optical disc (6), and a light emission amount control means (22) that controls a light emission amount of the semiconductor laser (1) by the laser driving circuit (21) so as to keep a peak intensity of a focused light spot formed on an information recording layer of the optical disc 6 to be greater than or equal to a peak intensity at which a super-resolution effect is obtained. The light emission amount control means (22) controls a light emission amount of the semiconductor laser (1) by the laser driving circuit (21) based on a decrease rate D of a peak intensity of a focused light spot on an information recording layer of the optical disc (1) determined by an assumed disc tilt and a comatic aberration according to a thickness of a light transmitting layer of the optical disc (1), and a lower limit value Pld_L of a light emission amount at which a predetermined reproduction performance is obtained.

摘要翻译： 光盘装置使用能够进行超分辨率再现的光盘（6），并且包括半导体激光器（1），向半导体激光器提供驱动电流的激光驱动电路（21），光接收元件（8） ），其检测来自光盘（6）的返回光并获得光盘（6）的记录数据的再现信号，以及控制半导体激光器（1）的发光量的发光量控制装置（22） 通过激光驱动电路（21）将形成在光盘6的信息记录层上的聚焦光点的峰值强度保持为大于或等于获得超分辨率效果的峰值强度 。 发光量控制装置（22）基于激光驱动电路（21）的信息记录层上的聚焦光点的峰值强度的降低率D来控制半导体激光器（1）的发光量 由假定的光盘倾斜和根据光盘（1）的光透射层的厚度的彗形像差确定的光盘（1）以及预定的再现性能的发光量的下限值Pld_L 获得。

公开(公告)号：US20130286808A1

公开(公告)日：2013-10-31

申请号：US13995625

申请日：2012-01-06

申请人： Kenya Nakai ,  Masayuki Omaki

发明人： Kenya Nakai ,  Masayuki Omaki

IPC分类号： G11B7/1263

CPC分类号： G11B7/1263 ,  G11B7/1376 ,  G11B7/24065 ,  G11B7/268 ,  G11B2007/0006 ,  G11B2007/0013

摘要： An optical disc device uses an optical disc (6) capable of super-resolution reproduction, and includes a semiconductor laser (1), a laser driving circuit (21) that supplies a driving current to the semiconductor laser, a light receiving element (8) that detects return light from the optical disc (6) and obtains reproduction signal of recording data of the optical disc (6), and a light emission amount control means (22) that controls a light emission amount of the semiconductor laser (1) by the laser driving circuit (21) so as to keep a peak intensity of a focused light spot formed on an information recording layer of the optical disc 6 to be greater than or equal to a peak intensity at which a super-resolution effect is obtained. The light emission amount control means (22) controls a light emission amount of the semiconductor laser (1) by the laser driving circuit (21) based on a decrease rate D of a peak intensity of a focused light spot on an information recording layer of the optical disc (1) determined by an assumed disc tilt and a comatic aberration according to a thickness of a light transmitting layer of the optical disc (1), and a lower limit value Pld_L of a light emission amount at which a predetermined reproduction performance is obtained.

摘要翻译： 光盘装置使用能够进行超分辨率再现的光盘（6），并且包括半导体激光器（1），向半导体激光器提供驱动电流的激光驱动电路（21），光接收元件（8） ），其检测来自光盘（6）的返回光并获得光盘（6）的记录数据的再现信号，以及控制半导体激光器（1）的发光量的发光量控制装置（22） 通过激光驱动电路（21）将形成在光盘6的信息记录层上的聚焦光点的峰值强度保持为大于或等于获得超分辨率效果的峰值强度 。 发光量控制装置（22）基于激光驱动电路（21）的信息记录层上的聚焦光点的峰值强度的降低率D来控制半导体激光器（1）的发光量 由假定的光盘倾斜和根据光盘（1）的光透射层的厚度的彗形像差确定的光盘（1）以及预定的再现性能的发光量的下限值Pld_L 获得。

公开(公告)号：US20120106310A1

公开(公告)日：2012-05-03

申请号：US13380791

申请日：2011-01-17

申请人： Masahisa Shinoda ,  Hironori Nakahara ,  Masayuki Omaki ,  Kenya Nakai ,  Nobuo Takeshita

发明人： Masahisa Shinoda ,  Hironori Nakahara ,  Masayuki Omaki ,  Kenya Nakai ,  Nobuo Takeshita

IPC分类号： G11B7/1353 ,  G11B7/1374

CPC分类号： G11B7/0903 ,  G11B7/094 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/13925 ,  G11B7/1395 ,  G11B2007/0013

摘要： An optical head device mounted in an optical disc device. The optical head device is provided with a diffractive optical element and a photodetector. The diffractive optical element has: a primary diffraction region at a location on which the positive and negative first-order components and some of the zero-order component of a reflectively diffracted light beam are incident; and secondary diffraction regions at locations on which the rest of the zero-order component but none of the positive or negative first-order components of the reflectively diffracted light beam are incident. A main light-receiving section of the photodetector receives the zero-order component of a transmissively diffracted light beam that has passed through the primary diffraction region and the secondary diffraction regions. Secondary light-receiving sections receive the positive first-order component and/or the negative first-order component of the transmissively diffracted light beam that has passed through the secondary diffraction regions.

摘要翻译： 安装在光盘装置中的光学头装置。 光头装置设置有衍射光学元件和光电检测器。 衍射光学元件具有：反射衍射光束的正，负一阶分量和零级分量的一部分入射的位置处的主衍射区域; 以及零反射衍射光束的零级分量的其余部分而不是反射衍射光束的正或负一阶分量的位置处的次级衍射区域。 光检测器的主光接收部接收通过一次衍射区域和二次衍射区域的透射衍射光束的零级分量。 次级光接收部分接收通过次级衍射区域的透射衍射光束的正一级分量和/或负一级分量。