公开(公告)号：US06249489B1

公开(公告)日：2001-06-19

申请号：US09141350

申请日：1998-08-27

申请人： Eiichi Fujii ,  Masakuni Yamamoto ,  Tsutomu Shiratori ,  Yasuyuki Miyaoka

发明人： Eiichi Fujii ,  Masakuni Yamamoto ,  Tsutomu Shiratori ,  Yasuyuki Miyaoka

IPC分类号： G11B1100

CPC分类号： G11B11/10508 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/10586

摘要： Disclosed herein is an information recording-reproducing method, wherein a domain wall is displaced on a recording medium in which information has been recorded, thereby conducting the reproduction of the information, the method comprising, projecting a light spot on the recording medium, relatively moving the light spot and the recording medium, applying a magnetic field modulated according to the information to the site projected by the light spot to form record marks the maximum mark length of which is at most 0.15 times the spot size of the light spot and displacing the domain wall from the front to the back of the moving direction of the light spot by a temperature distribution formed on the recording medium by the light spot, and at the same time detecting the displacement of the domain wall from reflected light of the light spot, thereby detecting the record marks.

摘要翻译： 这里公开了一种信息记录再现方法，其中域壁在已经记录信息的记录介质上移位，从而进行信息的再现，该方法包括：将光点投影在记录介质上，相对移动 光点和记录介质，将根据该信息调制的磁场施加到由光点投射的位置，以形成其最大标记长度为光斑大小的至多0.15倍的记录标记， 通过由光点在记录介质上形成的温度分布，从光斑的移动方向的前方到后方的畴壁，同时检测畴壁从光斑的反射光的位移， 从而检测记录标记。

公开(公告)号：US5956296A

公开(公告)日：1999-09-21

申请号：US931369

申请日：1997-09-16

申请人： Masakuni Yamamoto ,  Eiichi Fujii ,  Tsutomu Shiratori

发明人： Masakuni Yamamoto ,  Eiichi Fujii ,  Tsutomu Shiratori

IPC分类号： G11B11/10 ,  G11B5/02 ,  G11B7/125 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10515 ,  G11B11/10543 ,  G11B5/02

摘要： An information reproducing apparatus for reproducing information by moving a magnetic wall along an information track on a recording medium. The apparatus includes an optical system for irradiating the recording medium with a light spot of an oval shape having a longer axis and a shorter axis, of which the longer axis is substantially parallel to the information track and a ratio of the longer axis to the shorter axis is at least 1.4, and a movement device for performing relative movement between the light spot and the recording medium.

摘要翻译： 一种信息再现装置，用于通过沿着记录介质上的信息轨道移动磁壁来再现信息。 该装置包括一个光学系统，用于向具有长轴和短轴的椭圆形光点照射记录介质，其长轴基本上平行于信息轨迹，并且长轴与较短轴的比率 轴至少为1.4，以及用于在光点和记录介质之间执行相对移动的移动装置。

公开(公告)号：US5233578A

公开(公告)日：1993-08-03

申请号：US979459

申请日：1992-11-20

申请人： Masakuni Yamamoto ,  Koyo Hasegawa ,  Yasuyuki Miyaoka ,  Yutaka Ogasawara ,  Makoto Hiramatsu ,  Susumu Matsumura

发明人： Masakuni Yamamoto ,  Koyo Hasegawa ,  Yasuyuki Miyaoka ,  Yutaka Ogasawara ,  Makoto Hiramatsu ,  Susumu Matsumura

IPC分类号： G11B7/135 ,  G11B11/105

CPC分类号： G11B7/1384 ,  G11B11/10534 ,  G11B11/10543 ,  G11B11/10554 ,  G11B11/10576 ,  G11B11/1058

摘要： Disclosed is a method of recording information on a magnetooptical recording medium, which medium includes a first magnetic layer and a second magnetic layer having a lower Curie temperature and a higher coercive force at room temperature than those of the first magnetic layer. The second magnetic layer is exchange-coupled to the first magnetic layer. The first magnetic layer has a higher compensation temperature than the Curie temperature of the second magnetic layer. The method of recording information includes applying a magnetic field, which is modified in accordance with information from a magnetic head, to the medium to record information on the first magnetic layer and scanning the medium with a light beam to heat the medium to a temperature at least near the Curie temperature of the second magnetic layer so as to transfer the information recorded on the first magnetic layer to the second magnetic layer.

摘要翻译： 公开了一种在磁光记录介质上记录信息的方法，该介质包括在室温下具有比第一磁性层低的居里温度和较高矫顽力的第一磁性层和第二磁性层。 第二磁性层与第一磁性层交换耦合。 第一磁性层具有比第二磁性层的居里温度更高的补偿温度。 记录信息的方法包括将根据来自磁头的信息进行修改的磁场施加到介质上以在第一磁性层上记录信息并用光束扫描介质以将介质加热到介质的温度 最少靠近第二磁性层的居里温度，以将记录在第一磁性层上的信息传送到第二磁性层。

公开(公告)号：US20070025217A1

公开(公告)日：2007-02-01

申请号：US11486110

申请日：2006-07-14

申请人： Yasuyuki Miyaoka ,  Masakuni Yamamoto

发明人： Yasuyuki Miyaoka ,  Masakuni Yamamoto

IPC分类号： G11B27/36

CPC分类号： G11B27/3027 ,  G11B7/005 ,  G11B7/24088 ,  G11B11/10515 ,  G11B27/24 ,  G11B2220/2562

摘要： An optical information reproduction method includes the steps of detecting, in at least two adjacent virtual cells provided in a recording/reproduction area of an optical information medium, at least two cell center signal levels and a cell boundary signal level between the cell center signal levels and acquiring phase error information of a reproduction signal based on a difference between the detected cell boundary signal level and an ideal cell boundary signal level obtained in advance and on a gradient of reproduction signal levels corresponding to the detected cell center signal levels.

摘要翻译： 光信息再现方法包括以下步骤：在设置在光信息介质的记录/再现区域中的至少两个相邻虚拟单元中，检测至少两个单元中心信号电平和单元中心信号电平之间的单元边界信号电平 并且基于检测到的单元边界信号电平和预先获得的理想单元边界信号电平之间的差以及对应于检测到的单元格中心信号电平的再现信号电平的梯度，获取再现信号的相位误差信息。

公开(公告)号：US20060280069A1

公开(公告)日：2006-12-14

申请号：US11435895

申请日：2006-05-18

申请人： Masakuni Yamamoto ,  Yasuyuki Miyaoka

发明人： Masakuni Yamamoto ,  Yasuyuki Miyaoka

IPC分类号： G11B5/09

CPC分类号： G11B7/005 ,  G11B7/24088 ,  G11B20/1496

摘要： A multi-level information reproducing method is provided which can increase the degree of separation between distributions of cell boundary values to thereby improve the accuracy of reproduction. Specifically, in a method of reproducing multi-level information recorded on a track of an optical information recording medium by virtually providing cells at equal intervals and by varying a width of an information pit in a track direction or an area of an information pit, a cell boundary value (a value obtained by sampling a reproduced signal when a center of a light spot is located at a boundary of cells) is corrected based on cell center values of two cells adjacent to the boundary (a value obtained by sampling a reproduced signal when the center of the light spot is located at a center of a cell), and the multi-level information is reproduced based on the corrected cell boundary value.

公开(公告)号：US07573798B2

公开(公告)日：2009-08-11

申请号：US11435895

申请日：2006-05-18

申请人： Masakuni Yamamoto ,  Yasuyuki Miyaoka

发明人： Masakuni Yamamoto ,  Yasuyuki Miyaoka

IPC分类号： G11B5/09

CPC分类号： G11B7/005 ,  G11B7/24088 ,  G11B20/1496

摘要： A multi-level information reproducing method is provided which can increase the degree of separation between distributions of cell boundary values to thereby improve the accuracy of reproduction. Specifically, in a method of reproducing multi-level information recorded on a track of an optical information recording medium by virtually providing cells at equal intervals and by varying a width of an information pit in a track direction or an area of an information pit, a cell boundary value (a value obtained by sampling a reproduced signal when a center of a light spot is located at a boundary of cells) is corrected based on cell center values of two cells adjacent to the boundary (a value obtained by sampling a reproduced signal when the center of the light spot is located at a center of a cell), and the multi-level information is reproduced based on the corrected cell boundary value.

摘要翻译： 提供了可以增加单元边界值分布之间的分离程度从而提高再现精度的多级信息再现方法。 具体地，在通过以相等的间隔虚拟地提供单元并且通过改变信息凹坑的轨道方向或信息凹坑的区域的宽度来再现记录在光学信息记录介质的轨道上的多级信息的方法中， 基于与边界相邻的两个单元的单元格中心值（通过对再现信号进行取样而得到的值）来校正单元格边界值（通过对光点的中心位于单元的边界时对再现信号进行采样而获得的值） 当光点的中心位于单元的中心时），并且基于校正的单元边界值再现多级信息。

公开(公告)号：US07593302B2

公开(公告)日：2009-09-22

申请号：US11549759

申请日：2006-10-16

申请人： Masakuni Yamamoto ,  Jun Sumioka ,  Kaoru Okamoto

发明人： Masakuni Yamamoto ,  Jun Sumioka ,  Kaoru Okamoto

IPC分类号： G11B7/00

CPC分类号： G11B7/0062 ,  G11B7/24088

摘要： An optical information recording method includes the steps of irradiating laser light onto cells provided on a track of an optical information recording medium, recording on the optical information recording medium multilevel information including information of a level zero for which no information pit is formed, by changing, for each of the cells, widths in a track direction or sizes of information pits in the cells, and, for recording the information of a level zero, irradiating the laser light at a power that is greater than an erasing power for erasing the information pits and that does not permit formation of the information pits.

摘要翻译： 光信息记录方法包括以下步骤：将激光照射到设置在光信息记录介质的轨道上的单元上，在光信息记录介质上记录包含不形成信息凹坑的零电平的信息，通过改变 ，对于每个单元格，轨道方向上的宽度或单元格中的信息凹坑的大小，并且为了记录零电平的信息，以大于擦除功率的功率照射激光以擦除信息 坑并且不允许形成信息坑。

公开(公告)号：US20060109769A1

公开(公告)日：2006-05-25

申请号：US11283963

申请日：2005-11-22

申请人： Masakuni Yamamoto ,  Jun Sumioka

发明人： Masakuni Yamamoto ,  Jun Sumioka

IPC分类号： G11B7/00

CPC分类号： G11B7/24088 ,  G11B7/005

摘要： The present invention provides a multi-level information recording/reproducing method of recording or reproducing multi-level information by virtually setting cells at constant regular intervals on a track of an optical information medium where information is recorded or reproduced with a light spot and by varying an information pit width in a direction of the track or an information pit area, comprising the steps of: detecting a reproduced signal by radiating a light spot onto the track; detecting a cell border value by sampling the reproduced signal when the center of the light spot falls on a border between one cell and its following cell; and judging multi-level information of the following cell based on the cell border value.

公开(公告)号：US5841755A

公开(公告)日：1998-11-24

申请号：US612504

申请日：1996-03-07

申请人： Masakuni Yamamoto ,  Susumu Matsumura ,  Hiroaki Hoshi ,  Eiji Yamaguchi

发明人： Masakuni Yamamoto ,  Susumu Matsumura ,  Hiroaki Hoshi ,  Eiji Yamaguchi

IPC分类号： G11B7/0045 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B11/10543 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/1053

摘要： In a magnetooptical information recording-reproducing apparatus, recording of information is performed such that a laser beam is irradiated on a magnetooptical information recording medium via an optical head while applying a magnetic field to the beam irradiated portion of the recording medium onto which information pits are formed by utilizing the difference in the direction of magnetization thereof. The magnetooptical information recording-reproducing apparatus is provided with a band-like shielding plate which is arranged in an optical path of a reflected light from the recording medium upon application of the laser beam thereto in a direction perpendicular to tracks of the recording medium. Reproduction of information recorded on the recording medium is effected by detecting the beam which is not shielded by the shielding plate by use of a photodetector.

摘要翻译： 在磁光信息记录再现装置中，进行信息的记录，使得激光束经由光头照射在磁光信息记录介质上，同时向记录介质的光束照射部分施加磁场，信息凹坑 通过利用其磁化方向的差异形成。 磁光信息记录再现装置设置有带状屏蔽板，该带状屏蔽板在垂直于记录介质的轨道的方向上将激光束施加到来自记录介质的反射光的光路中。 记录在记录介质上的信息的再现是通过使用光电检测器检测未被屏蔽板屏蔽的光束来实现的。

公开(公告)号：US5712840A

公开(公告)日：1998-01-27

申请号：US282768

申请日：1994-07-29

申请人： Susumu Matsumura ,  Masakuni Yamamoto ,  Eiji Yamaguchi ,  Hiroaki Hoshi ,  Hideki Morishima

发明人： Susumu Matsumura ,  Masakuni Yamamoto ,  Eiji Yamaguchi ,  Hiroaki Hoshi ,  Hideki Morishima

IPC分类号： G11B7/13 ,  G11B7/135 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B7/131 ,  G11B11/10543 ,  G11B11/10597 ,  G11B7/133 ,  G11B7/1381

摘要： An optical information recording/reproducing apparatus is disclosed. In the apparatus, a light beam polarized in a predetermined direction is irradiated onto an opto-magnetic recording medium to which a pre-determined magnetic field is applied. The light beam from the recording medium is condensed by the optical device and the condenced light beam is detected by the two-division detector. The two-division detector has a division line extending in a direction perpendicular to tracks on the recording medium. According to the apparatus, crosstalks and jitters can be eliminated and reproduction with high reliability can be realized.

摘要翻译： 公开了一种光信息记录/重放装置。 在该装置中，将沿预定方向偏振的光束照射到施加了预定磁场的光磁记录介质上。 来自记录介质的光束被光学装置冷凝，并且通过双分割检测器检测受限制的光束。 双分度检测器具有沿垂直于记录介质上的轨道的方向延伸的分割线。 根据该装置，可以消除串扰和抖动，并且可以实现高可靠性的再现。