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：US5398227A

公开(公告)日：1995-03-14

申请号：US24394

申请日：1993-03-01

申请人： Yasuyuki Miyaoka ,  Koyo Hasegawa

发明人： Yasuyuki Miyaoka ,  Koyo Hasegawa

IPC分类号： G11B11/105 ,  G11B7/125

CPC分类号： G11B11/10595 ,  G11B11/10508

摘要： A magnetooptical recording/reproducing apparatus is provided with a device for determinating a power of a light beam which is emitted from a light source. In the apparatus, the light beam is irradiated on a magnetooptical recording medium while a magnetic field modulated according to a recording signal is applied to a portion on which the light beam is being irradiated. Light reflected from the medium upon the irradiation of the light beam thereto is detected by a detector, the output from which is used to reproduce the recording signal. The amplitude of the recording signal is detected from the reproduction signal. The power of the light beam to be emitted from the light source is determined on the basis of the detected amplitude of the recording signal.

摘要翻译： 磁光记录/再现装置设置有用于确定从光源发射的光束的功率的装置。 在装置中，将光束照射在磁光记录介质上，同时根据记录信号调制的磁场被施加到其上照射光束的部分。 在照射光束时从介质反射的光由检测器检测，检测器用于再现记录信号。 根据再现信号检测记录信号的幅度。 基于检测到的记录信号的幅度来确定从光源发射的光束的功率。

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：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：US09116163B2

公开(公告)日：2015-08-25

申请号：US13041742

申请日：2011-03-07

申请人： Yasumichi Arimitsu ,  Yasuyuki Miyaoka

发明人： Yasumichi Arimitsu ,  Yasuyuki Miyaoka

IPC分类号： G01P3/36 ,  G01B11/00 ,  G01P3/68 ,  G01D5/245 ,  G01D5/347 ,  G03G15/00 ,  G01P3/486

CPC分类号： G01P3/68 ,  G01D5/2451 ,  G01D5/34746 ,  G01P3/486 ,  G03G15/5054 ,  G03G2215/0158

摘要： A displacement measuring apparatus including: a first light detector including a first emitter illuminating optically identifiable marks disposed on a moving body, and a first light receiver detecting light through the marks; a second light detector including a second emitter illuminating the marks and a second light receiver detecting light through the marks, wherein the second light detector is arranged at a predetermined interval from the first light detector in a moving direction of the moving body; an identical point detecting unit detecting a first timing at which the first and second light detector detecting an identical mark among the marks, and a second timing; a velocity calculating unit calculating a velocity of the moving body by using the first and second timing determined by the identical point detecting unit; and a time-sharing light emitting unit allowing the first and second emitter to emit the light in a time-sharing manner.

摘要翻译： 1.一种位移测量装置，包括：第一光检测器，包括第一发射器，其照射设置在移动体上的光学识别标记;以及第一光接收器，用于检测通过所述标记的光; 第二光检测器，包括照射标记的第二发射体和通过标记检测光的第二光接收器，其中所述第二光检测器沿所述移动体的移动方向以与所述第一光检测器预定的间隔布置; 相同点检测单元，检测第一和第二光检测器检测到标记之间的相同标记的第一定时和第二定时; 速度计算单元，通过使用由同一点检测单元确定的第一和第二定时来计算移动体的速度; 以及允许第一和第二发射器以分时方式发光的分时发光单元。

公开(公告)号：US07782722B2

公开(公告)日：2010-08-24

申请号：US11844124

申请日：2007-08-23

申请人： Yasuyuki Miyaoka

发明人： Yasuyuki Miyaoka

IPC分类号： G11B7/00

CPC分类号： G11B7/0945 ,  G11B7/094

摘要： A method of adjusting spherical aberration correction and focus offset of a light beam. A first approximate straight line is detected indicating a first relationship between the spherical aberration correction and the focus offset according to a first evaluation index indicating a quality of cross-track signal. A second approximate straight line is detected indicating a second relationship between the spherical aberration correction and the focus offset according to a second evaluation index indicating a quality of a reproduced signal. A spherical aberration correction value and a focus offset value, to be adjusted, are determined from an intersection of the first approximate straight line and the second approximate straight line.

摘要翻译： 调整光束的球面像差校正和聚焦偏移的方法。 根据指示交叉轨道信号的质量的第一评估指标，检测第一近似直线，指示球面像差校正和聚焦偏移之间的第一关系。 根据指示再现信号的质量的第二评价指标，检测出第二近似直线，指示球面像差校正和聚焦偏移之间的第二关系。 根据第一近似直线和第二近似直线的交点确定要调整的球面像差校正值和聚焦偏移值。

公开(公告)号：US20060015797A1

公开(公告)日：2006-01-19

申请号：US11131194

申请日：2005-05-18

申请人： Yasuyuki Miyaoka

发明人： Yasuyuki Miyaoka

IPC分类号： H03M13/03

CPC分类号： G11B20/10009 ,  G11B20/10111 ,  G11B20/10296 ,  G11B20/10481 ,  G11B20/1833

摘要： To provide a regenerative signal evaluation method in which the transition of polarity of a regenerative signal, or the change of polarity in a record mark sequence, is dealt with employing an index in correlation with an error ratio of binarization result by a maximum likelihood decoding. The method comprises detecting a recording series on a state transition path having a certain Euclid distance by the maximum likelihood decoding corresponding to a change of polarity of record code in the recording series, acquiring a likelihood difference between the most probable state transition path and the secondly probable state transition path from branch of state transition paths to merge of state transition paths in the detected recording series, and conducting a statistical processing for the likelihood difference individually corresponding to the change of polarity in the recording series to evaluate the quality of reproducing signal.

摘要翻译： 为了提供一种再生信号评估方法，其中再现信号的极性的转变或记录标记序列中的极性的变化通过最大似然解码采用与二值化结果的误差比相关的指数来处理。 该方法包括：检测具有某一欧几里德距离的状态转换路径上的记录序列与对应于记录序列中的记录码极性变化的最大似然解码，获取最可能状态转换路径与第二次可能状态转换路径之间的似然差 从状态转移路径分支到状态转移路径合并的检测记录序列的可能状态转移路径，并且对与记录序列中的极性变化分别对应的似然度差进行统计处理，以评估再现信号的质量。

公开(公告)号：US06646968B1

公开(公告)日：2003-11-11

申请号：US09606019

申请日：2000-06-29

申请人： Yasuyuki Miyaoka

发明人： Yasuyuki Miyaoka

IPC分类号： G11B390

CPC分类号： G11B7/1267 ,  G11B7/00736 ,  G11B11/10508 ,  G11B11/1051 ,  G11B11/10515 ,  G11B11/10595

摘要： Disclosed herein is a testing process for recording for presetting optimum recording power for a domain wall displacement type magneto-optical medium, the process comprising the steps of: recording a first record pattern on an Nth track on the magneto-optical medium; separately recording a second record pattern on an (N−1)th track and an (N+1)th track adjacent to both sides of the Nth track with varied recording power; reproducing the Nth track to detect a change in the pulse width of a reproduction signal; detecting recording power, at which cross writing occurs, on the basis of the detected result; and presetting optimum recording power on the basis of the recording power at which cross writing occurs.

摘要翻译： 本文公开了一种记录用于域壁位移型磁光介质的最佳记录功率的测试过程，该方法包括以下步骤：在磁光介质上的第N个磁道上记录第一记录图案;分别记录 第（N-1）个轨道和与第N个轨道的两侧相邻的第（N + 1）个轨道的第二记录模式，记录功率变化;再现第N个磁道以检测再现信号的脉冲宽度的变化 根据检测结果检测发生交叉写入的记录功率; 并根据发生交叉写入的记录功率来选择最佳记录功率。