公开(公告)号：US20060227670A1

公开(公告)日：2006-10-12

申请号：US11209648

申请日：2005-08-24

申请人： Motoyasu Terao ,  Toshimasa Kamisada ,  Shinichi Nakatsuka ,  Takeshi Shimano ,  Hitoshi Ishii ,  Kazuhiro Soga ,  Yoshiaki Ogino

发明人： Motoyasu Terao ,  Toshimasa Kamisada ,  Shinichi Nakatsuka ,  Takeshi Shimano ,  Hitoshi Ishii ,  Kazuhiro Soga ,  Yoshiaki Ogino

IPC分类号： G11B11/00

CPC分类号： G11B7/1367 ,  G11B7/0938 ,  G11B7/127 ,  G11B2007/0009

摘要： To achieve stable, high capacity, high speed recording. Of two light beams emitted from a light irradiation means, one or two beams are made pass through an optical path changeable member whereof at least one of the thickness and refractive index changes continuously or in two or more steps immediately after emission from the light irradiation means, so that a difference is introduced into the optical path length of the two beams, and the focusing point of one beam is made to vary to coincide with a position in the recording layer used for playback or recording. Another light beam is used for servo. Converging of light during recording or read of a multilayer recording medium is performed with higher precision than in the prior art, so higher density, higher capacity recording/playback can be performed.

公开(公告)号：US07068572B2

公开(公告)日：2006-06-27

申请号：US10934384

申请日：2004-09-07

申请人： Tetsuo Ariyoshi ,  Mariko Umeda ,  Takeshi Shimano

发明人： Tetsuo Ariyoshi ,  Mariko Umeda ,  Takeshi Shimano

IPC分类号： G11B7/00

CPC分类号： G11B7/1353 ,  G11B7/0943 ,  G11B7/0948 ,  G11B7/0956 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1369 ,  G11B7/13927 ,  G11B2007/0013

摘要： To stably carry out recording and reproducing to and from a high density optical disk without using a double servo in the optical disk using a high NA objective lens. A detection of a spherical aberration and a detection of a coma aberration in a radial direction are simultaneously performed, and the coma aberration generated with the offset of an objective lens 109 is corrected in real time, thus enlarging an allowable offset amount of the objective lens. In order to simultaneously detect the spherical aberration and the coma aberration, focal shift and tracking shift signals in an inside region and outside region of reflected light flux are detected respectively, and the differential signals are set as spherical aberration and coma aberration signals.

公开(公告)号：US20060056276A1

公开(公告)日：2006-03-16

申请号：US11270613

申请日：2005-11-10

申请人： Takeshi Shimano ,  Takeshi Maeda ,  Hirofumi Sukeda

发明人： Takeshi Shimano ,  Takeshi Maeda ,  Hirofumi Sukeda

IPC分类号： G11B7/135 ,  G11B7/00

CPC分类号： G11B7/13927 ,  G11B7/08576 ,  G11B7/09 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1365 ,  G11B7/1369 ,  G11B7/1381 ,  G11B2007/13727

摘要： In the past there has been a problem that on a detection surface the influence of interference causes a defocusing signal to degrade, narrowing the range in which spherical aberration can be stably detected. Accordingly, a diffraction grating is used to focus the inner and outer sides of luminous flux on separate optical detectors before the optical flux is focused on an optical detector and defocusing signals are independently calculated to find the difference therebetween, thereby providing a spherical aberration signal. This makes it possible to detect spherical aberation signals more stably.

摘要翻译： 过去存在这样的问题：在检测面上，干扰的影响会导致散焦信号劣化，能够使可以稳定地检测球面像差的范围变窄。 因此，衍射光栅用于在光通量聚焦在光学检测器之前将光通量的内侧和外侧聚焦在单独的光学检测器上，并且独立地计算散焦信号以找到它们之间的差异，从而提供球面像差信号。 这使得可以更稳定地检测球面像差信号。

公开(公告)号：US20050226111A1

公开(公告)日：2005-10-13

申请号：US10914194

申请日：2004-08-10

申请人： Takeshi Shimano ,  Tatsuro Ide

发明人： Takeshi Shimano ,  Tatsuro Ide

IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/13927

摘要： Disclosed here is a method for solving a conventional problem that no spherical aberration signal can be detected from any push-pull signal that is easy to adjust an object photodetector when a differential push-pull signal is obtained. To achieve the above object, sub-beams used to detect a differential push-pull signal are defocused from the main beam and spherical aberration signals are detected and the compensation of the spherical aberration is started while tracking controlling is off and detection of spherical aberration signals is held while the tracking controlling is on. The present invention can thus obtain both of the spherical aberration signal and the differential push-pull signal at the same time with use of the conventional detection system.

摘要翻译： 这里公开了一种解决传统问题的方法，即当获得差分推挽信号时，任何容易调整物体光电检测器的推挽信号都不能检测到球面像差信号。 为了实现上述目的，用于检测差分推挽信号的子光束与主光束散焦，并且检测球面像差信号，并且在跟踪控制关闭并且检测球面像差信号时开始球面像差的补偿 在跟踪控制开启时保持。 因此，本发明可以使用传统的检测系统同时获得球面像差信号和差分推挽信号两者。

公开(公告)号：US06934228B2

公开(公告)日：2005-08-23

申请号：US10827339

申请日：2004-04-20

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： G11B7/00 ,  G11B7/007 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135

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 having a semiconductor laser and a generation of a plurality of reflected light beams from an optical disk which have polarities of intensity distribution variations which are substantially inverted to each other when a periodic structure of the optical disk crosses at least one focused spot on the disk. An optical detection system splits the plurality of reflected light beams and detects the split reflected light beams. An electrical circuit provides a focus error signal of the at least one focused spot and a tracking error signal from the plurality of reflected light beams. The electrical circuit adds focus error signals provides a difference signal between the focus error signals, amplifies tracking error signals with a gain, and obtains a difference between amplified tracking error.

摘要翻译： 具有半导体激光器的光学头和从光盘产生多个具有强度分布变化的极性的多个反射光束的光头，当光盘的周期性结构与至少一个聚焦点交叉时，其基本上相互反转 磁盘。 光学检测系统分割多个反射光束并检测分离的反射光束。 电路提供至少一个聚焦点的聚焦误差信号和来自多个反射光束的跟踪误差信号。 电路增加聚焦误差信号在聚焦误差信号之间提供差分信号，用增益放大跟踪误差信号，并获得放大跟踪误差之间的差异。

公开(公告)号：US06922386B2

公开(公告)日：2005-07-26

申请号：US10713265

申请日：2003-11-17

申请人： Toshimichi Shintani ,  Harukazu Miyamoto ,  Takeshi Maeda ,  Takeshi Shimano ,  Takahiro Kurokawa

发明人： Toshimichi Shintani ,  Harukazu Miyamoto ,  Takeshi Maeda ,  Takeshi Shimano ,  Takahiro Kurokawa

IPC分类号： G11B7/0045 ,  G11B7/006 ,  G11B7/125 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/1369 ,  G11B7/006 ,  G11B7/128 ,  G11B7/1353 ,  G11B7/1395

摘要： Light emitted from a laser is divided into two light waves so that the ratio of the power of one light wave to the power of the other will be appropriate. The resultant light waves are irradiated to the same track on a medium. The preceding spot is used for erasure, and modulated so that the same pattern as the one formed with a recording pulse will be formed. The high-power component of the modulated light of the erasing spot causes the temperature of a recording layer to be equal to or higher than the melting point. The medium-power component of the modulated light forms a crystallizing temperature area on the recording layer. A liquid crystal diffraction grating is used to divide power, and a power division ratio is variable and controllable.

摘要翻译： 从激光发射的光被分成两个光波，使得一个光波的功率与另一个光的功率的比率将是适当的。 所得到的光波照射到介质上的同一轨道上。 前一个点用于擦除，并被调制，使得将形成与记录脉冲形成的图案相同的图案。 擦除斑点的调制光的高功率分量导致记录层的温度等于或高于熔点。 调制光的中功率分量在记录层上形成结晶温度区域。 使用液晶衍射光栅来分配功率，功率分配比是可变的和可控的。

公开(公告)号：US20050025000A1

公开(公告)日：2005-02-03

申请号：US10934384

申请日：2004-09-07

申请人： Tetsuo Ariyoshi ,  Mariko Umeda ,  Takeshi Shimano

发明人： Tetsuo Ariyoshi ,  Mariko Umeda ,  Takeshi Shimano

IPC分类号： G11B7/095 ,  G11B7/00 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/0943 ,  G11B7/0948 ,  G11B7/0956 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1369 ,  G11B7/13927 ,  G11B2007/0013

摘要： To stably carry out recording and reproducing to and from a high density optical disk without using a double servo in the optical disk using a high NA objective lens. A detection of a spherical aberration and a detection of a coma aberration in a radial direction are simultaneously performed, and the coma aberration generated with the offset of an objective lens 109 is corrected in real time, thus enlarging an allowable offset amount of the objective lens. In order to simultaneously detect the spherical aberration and the coma aberration, focal shift and tracking shift signals in an inside region and outside region of reflected light flux are detected respectively, and the differential signals are set as spherical aberration and coma aberration signals.

摘要翻译： 为了在不使用高NA物镜的光盘中不使用双重伺服的情况下稳定地向高密度光盘执行记录和再现。 同时执行球面像差的检测和径向的彗形像差的检测，并且实时地修正由物镜109的偏移产生的彗形像差，从而扩大物镜的容许偏移量 。 为了同时检测球面像差和彗形像差，分别检测反射光束的内部区域和外部区域中的焦点偏移和跟踪偏移信号，并将差分信号设置为球面像差和彗形像差信号。

公开(公告)号：US06430140B1

公开(公告)日：2002-08-06

申请号：US09946757

申请日：2001-09-06

申请人： Takeshi Shimano ,  Akira Arimoto

发明人： Takeshi Shimano ,  Akira Arimoto

IPC分类号： G11B7135

CPC分类号： G11B7/127 ,  G11B7/0909 ,  G11B7/12 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

摘要： An objective lens and an optical head including the objective lens for reading information contained on substrates having different thicknesses using laser beams having different wavelengths. The objective lens includes an annular phase shifter for decreasing an aberration of a focused spot of each of the laser beams. The annular phase shifter can be optimally combined with the objective lens having inner and outer regions each having a different substrate thicknesses.

公开(公告)号：US06215756B1

公开(公告)日：2001-04-10

申请号：US09041768

申请日：1998-03-13

申请人： Takeshi Shimano ,  Akira Arimoto

发明人： Takeshi Shimano ,  Akira Arimoto

IPC分类号： G11B7135

CPC分类号： G11B7/127 ,  G11B7/0909 ,  G11B7/12 ,  G11B7/1374 ,  G11B7/13922 ,  G11B2007/0006

摘要： An objective lens and an optical head including the objective lens for reading information contained on substrates having different thicknesses using laser beams having different wavelengths. The objective lens includes an annular phase shifter for decreasing an aberration of a focused spot of each of the laser beams. The annular phase shifter can be optimally combined with the objective lens having inner and outer regions each having a different substrate thicknesses.

摘要翻译： 一种物镜和光学头，包括用于使用具有不同波长的激光束读取包含在具有不同厚度的基板的信息的物镜。 物镜包括用于减少每个激光束的聚焦光点的像差的环形移相器。 环形移相器可以与具有各自具有不同衬底厚度的内部和外部区域的物镜进行最佳组合。

公开(公告)号：US5615192A

公开(公告)日：1997-03-25

申请号：US319796

申请日：1994-10-07

申请人： Atsushi Kikukawa ,  Sumio Hosaka ,  Youji Maruyama ,  Toshimichi Shintani ,  Takeshi Shimano

发明人： Atsushi Kikukawa ,  Sumio Hosaka ,  Youji Maruyama ,  Toshimichi Shintani ,  Takeshi Shimano

IPC分类号： G11B5/00 ,  G11B5/02 ,  G11B7/12 ,  G11B7/135 ,  G11B7/14 ,  G11B9/00 ,  G11B11/00 ,  G11B11/105 ,  G11B13/00 ,  G11B20/06 ,  G11B20/10 ,  G11B27/30 ,  G11B7/00

CPC分类号： B82Y10/00 ,  G11B11/002 ,  G11B11/007 ,  G11B11/10536 ,  G11B11/10545 ,  G11B11/10576 ,  G11B13/00 ,  G11B20/06 ,  G11B20/10 ,  G11B27/3027 ,  G11B5/00 ,  G11B5/02 ,  G11B7/12 ,  G11B7/1384 ,  G11B7/14 ,  G11B9/14 ,  G11B20/14 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  Y10S977/881 ,  Y10S977/932

摘要： A recording-reproducing apparatus can remarkably relax the reproduction tracking accuracy by use of a head wider than the track width. The carrier signal frequency assigned to a recording track is designated to a synthesized signal generator. In compliance with this designation, the synthesized signal generator generates a signal of the designated frequency. This carrier signal is amplitude-modulated by the baseband signal to be recorded in a mixer. The unrequired frequency components are removed from this modulation signal by a bandpass filter, and the resulting signal is recorded in a recording medium by a head. The recording medium and the head are in relative motion. In read mode, a track is specified by the carrier signal.

摘要翻译： 记录再现装置可以通过使用比轨道宽度更宽的头部显着地放松再现跟踪精度。 分配给记录磁道的载波信号频率被指定给合成信号发生器。 根据该指定，合成信号发生器产生指定频率的信号。 该载波信号由基带信号进行幅度调制，以记录在混频器中。 通过带通滤波器从该调制信号中去除非需要的频率分量，并将所得到的信号通过磁头记录在记录介质中。 记录介质和磁头相对运动。 在读取模式下，通过载波信号指定轨道。