公开(公告)号：US5854775A

公开(公告)日：1998-12-29

申请号：US740260

申请日：1996-10-25

申请人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

发明人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

IPC分类号： G11B11/105 ,  G11B11/00

CPC分类号： G11B11/1053 ,  G11B11/10506 ,  G11B11/10521

摘要： A magneto-optic disk recording system capable of canceling shifts of the front edge and the rear edge of the record mark due to accumulation of heat. The recording system includes a magneto-optic disk having a record magnetic film, and a magnet for applying a bias magnetic field to the disk in the direction perpendicular thereto. The recording system further includes a laser diode for generating laser beams, an optical head for focusing the laser beam on the disk, a pulse generator for generating square wave pulses with a predetermined period, and a duty ratio controller for alternately increasing and decreasing the duty ratio of the square wave pulses every time data "1" of binary record data is generated. The laser diode is driven by a constant-current circuit for write power. There is connected a switch between the laser diode and the constant-current circuit for write power. The switch is turned on/off in accordance with the output pulse of the duty ratio controller so that the laser diode emits a pulsed beam.

摘要翻译： 一种磁光盘记录系统，其能够消除由于积聚而导致的记录标记的前边缘和后边缘的偏移。 记录系统包括具有记录磁性膜的磁光盘和用于在与其垂直的方向上向磁盘施加偏置磁场的磁体。 记录系统还包括用于产生激光束的激光二极管，用于将激光束聚焦在盘上的光头，用于产生具有预定周期的方波脉冲的脉冲发生器和用于交替地增加和减小占空比的占空比控制器 每当产生二进制记录数据的数据“1”时，方波脉冲的比率。 激光二极管由用于写入功率的恒流电路驱动。 在激光二极管和恒流电路之间连接一个开关，用于写入功率。 根据占空比控制器的输出脉冲使开关导通/截止，使得激光二极管发射脉冲光束。

公开(公告)号：US5428594A

公开(公告)日：1995-06-27

申请号：US104045

申请日：1993-08-18

申请人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

发明人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

IPC分类号： G11B11/105 ,  G11B11/10

CPC分类号： G11B11/1053 ,  G11B11/10517 ,  G11B11/10595

摘要： A magneto-optic recording method and a magneto-optic recording apparatus in which a magneto-optic overwritable medium having two layers, which layers have different coercive force--temperature characteristics and are coupled by exchange interaction, is heated by applying a light beam while an external magnetic field is being applied to the medium and in which data coded to invariably have FALSE states between two TRUE states is turned into a light beam having dual power levels and recorded on the medium, the magneto-optic recording method including the steps of: forming record marks by heating the magneto-optic overwritable medium to a high temperature by means of a high light beam power associated with a FALSE state in the write data; and of heating the magneto-optic overwritable medium to a low temperature by means of a low light beam power associated with a TRUE state in the write data.

摘要翻译： PCT No.PCT / JP92 / 01701 Sec。 371日期：1993年8月18日 102（e）日期1993年8月18日PCT提交1992年12月25日PCT公布。 公开号WO93 / 13523 日期：1993年7月8日。磁光记录方法和磁光记录装置，其中具有两层的磁光可覆写介质，这些层具有不同的矫顽力 - 温度特性并通过交换相互作用耦合，被加热 通过在将外部磁场施加到介质的同时施加光束，并且其中被编码为在两个TRUE状态之间总是具有FALSE状态的数据被转换成具有双功率电平并被记录在介质上的光束 记录方法包括以下步骤：通过在写入数据中与FALSE状态相关联的高光束功率将磁光可重写介质加热到高温来形成记录标记; 以及通过与写入数据中的TRUE状态相关联的低光束功率将磁光可重写介质加热到低温。

公开(公告)号：US5390156A

公开(公告)日：1995-02-14

申请号：US130848

申请日：1993-10-04

申请人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

发明人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

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

CPC分类号： G11B11/1053 ,  G11B11/10506 ,  G11B11/10521

摘要： A magneto-optic overwrite disk recording system capable of canceling shifts of the front edge and the rear edge of the record mark due to accumulation of heat. The recording system includes a magneto-optic overwrite disk having a memory magnetic film and a record magnetic film, a first magnet for applying an initialization magnetic field with a first strength vertically to the disk, and a second magnet for applying a bias magnetic field with a second strength smaller than the first magnetic field to the disk in the direction opposite to the initialization magnetic field. The recording system further includes a laser diode for generating laser beams, an optical head for focusing the laser beam on the disk, a pulse generator for generating square wave pulses with a predetermined period, and a duty ratio controller for alternately increasing and decreasing the duty ratio of the square wave pulses every time data "1" of binary record data is generated. The laser diode is driven by a constant-current circuit for write power. There is connected a switch between the laser diode and the constant-current circuit for write power. The switch is turned on/off in accordance with the output pulse of the duty ratio controller so that the laser diode emits a pulsed beam.

摘要翻译： 一种能够消除记录标记的前边缘和后边缘由于热积累而发生偏移的磁光覆盖盘记录系统。 记录系统包括具有存储器磁性膜和记录磁性膜的磁光覆盖盘，用于向盘垂直施加第一强度的初始化磁场的第一磁体和用于施加偏置磁场的第二磁体， 在与初始化磁场相反的方向上比盘的第一磁场小的第二强度。 记录系统还包括用于产生激光束的激光二极管，用于将激光束聚焦在盘上的光头，用于产生预定周期的方波脉冲的脉冲发生器和用于交替增加和减少占空比的占空比控制器 每当产生二进制记录数据的数据“1”时，方波脉冲的比率。 激光二极管由用于写入功率的恒流电路驱动。 在激光二极管和恒流电路之间连接一个开关，用于写入功率。 根据占空比控制器的输出脉冲使开关导通/截止，使得激光二极管发射脉冲光束。

公开(公告)号：US5359586A

公开(公告)日：1994-10-25

申请号：US115325

申请日：1993-09-02

申请人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

发明人： Haruhiko Izumi ,  Masaharu Moritsugu ,  Masakazu Taguchi

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B7/00

CPC分类号： G11B11/10515 ,  G11B20/10009 ,  G11B20/1403

摘要： An apparatus for reading out data recorded on a magneto-optic disk by detecting edges of magnetic domains formed such that the direction of magnetization thereof is opposite to the direction of the magnetization initially formed on the magneto-optic disk, the edges of the magnetic domains corresponding to "1"s of the recorded data. The data read out apparatus includes a read out signal generation portion for generating a read out signal by scanning the magnetic domains on the magneto-optic disk, a binarization portion for converting the read out signal into a binarized signal, and an edge detection portion for detecting from the binarized signal a front edge signal and a rear edge signal corresponding to the front edge and the rear edge of the magnetic domains, respectively. A front edge signal from a fixed delay device and a rear edge signal from a variable delay device are input to an OR circuit and an edge signal is output therefrom. A phase-locked loop circuit generates a clock signal synchronized with the edge signal and this clock signal is used in a data separator for separating the data from the edge signal output from the OR circuit.

摘要翻译： 一种用于通过检测形成的磁畴的边缘来读出记录在磁光盘上的数据的装置，使得其磁化方向与最初形成在磁光盘上的磁化方向相反，磁畴的边缘 对应于记录数据的“1”。 数据读出装置包括读出信号产生部分，用于通过扫描磁光盘上的磁畴产生读出信号，用于将读出信号转换为二值化信号的二值化部分，以及用于 从二值化信号中分别检测与磁畴的前边缘和后边缘相对应的前沿信号和后边缘信号。 来自固定延迟装置的前沿信号和来自可变延迟装置的后沿信号被输入到或电路，并从其输出边沿信号。 锁相环电路产生与边沿信号同步的时钟信号，该时钟信号用于数据分离器，用于将数据与OR电路输出的边沿信号分离。

公开(公告)号：US5347505A

公开(公告)日：1994-09-13

申请号：US4865

申请日：1993-01-19

申请人： Masaharu Moritsugu ,  Haruhiko Izumi ,  Masakazu Taguchi

发明人： Masaharu Moritsugu ,  Haruhiko Izumi ,  Masakazu Taguchi

IPC分类号： G11B7/0045 ,  G11B7/013 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B27/36 ,  H04N5/76

CPC分类号： G11B7/126 ,  G11B11/10504 ,  G11B11/1053 ,  G11B20/10194 ,  G11B27/36 ,  G11B7/0045 ,  G11B7/24085

摘要： A method and apparatus for optical recording addresses a problem of edge shift which occurs during the recording. The apparatus includes a rotating mechanism for rotating an optical medium, and an optical head having a light source for recording information on the optical medium. A moving mechanism moves the optical head to a predetermined position on the optical medium, and a recording controlling device controls light source of the optical head in accordance with a recording pulse. The recording controlling device includes a pulse width measuring device for measuring the pulse width of a recording pulse, and fall controlling device effects a recording compensation by advancing a fall of the recording pulse with a lead, such that the lead increases with the measured pulse width. A pulse interval measuring device is provided for measuring a pulse interval preceding the recording pulse, and a rise controlling device effects a recording compensation by delaying a rise of the recording pulse with a delay, such that the delay decreases with the measured pulse interval.

摘要翻译： 用于光学记录的方法和装置解决了在记录期间发生的边缘偏移的问题。 该装置包括用于旋转光学介质的旋转机构和具有用于在光学介质上记录信息的光源的光学头。 移动机构将光头移动到光学介质上的预定位置，记录控制装置根据记录脉冲控制光头的光源。 记录控制装置包括用于测量记录脉冲的脉冲宽度的脉冲宽度测量装置，并且下降控制装置通过使用引线引起记录脉冲的下降来实现记录补偿，使得引线随测量的脉冲宽度而增加 。 提供脉冲间隔测量装置，用于测量记录脉冲之前的脉冲间隔，并且上升控制装置通过延迟记录脉冲的上升延迟来实现记录补偿，使得延迟随测量的脉冲间隔而减小。

公开(公告)号：US5235590A

公开(公告)日：1993-08-10

申请号：US851537

申请日：1992-03-13

申请人： Masakazu Taguchi ,  Akio Futamata ,  Masaharu Moritsugu ,  Haruhiko Izumi

发明人： Masakazu Taguchi ,  Akio Futamata ,  Masaharu Moritsugu ,  Haruhiko Izumi

IPC分类号： G11B11/105 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14

CPC分类号： G11B20/10222 ,  G11B11/10515 ,  G11B11/1053 ,  G11B11/10597 ,  G11B20/10009 ,  G11B20/1217 ,  G11B20/1426 ,  G11B2220/2525

摘要： A read out apparatus reads out prerecorded information from a magneto-optic disk by detecting intervals of edges of magnetic domains formed on the magneto-optic disk with different directions of magnetization, where the intervals of the edges of the magnetic domains correspond to data "1"s or "0""1"s of the prerecorded information. The read out apparatus includes a first part for producing a read out signal by scanning the magnetic domains of the magneto-optic disk, a second part for producing an edge detection signal which has rising and falling edges depending on leading and trailing edges of the magnetic domains, and for corecting edge positions of the edge detection signal based on predetermined information, a third part including a phase locked loop circuit for producing a clock signal which is synchronized to the rising and falling edges of the edge detection signal, and a fourth part for separating the data from the edge detection signal output from the second part using the clock signal output from the third part.

公开(公告)号：US5986987A

公开(公告)日：1999-11-16

申请号：US54653

申请日：1998-04-03

申请人： Masakazu Taguchi ,  Haruhiko Izumi

发明人： Masakazu Taguchi ,  Haruhiko Izumi

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12

CPC分类号： G11B20/10083 ,  G11B11/10515 ,  G11B20/10009 ,  G11B7/005 ,  G11B20/1258 ,  G11B2220/2537

摘要： A system reproduces data from an optical disk in which a signal obtained by encoding recording data in accordance with a recording rule including a rule corresponding to a partial response class I characteristic has been recorded. The system includes an optical head for reproducing a signal from the optical disk, an analog-to-digital converter for sampling the signal reproduced by the optical head at predetermined timing and for outputting sampling data, a determination unit for determining, based on the sampling data from the analog-to-digital converter, a transition state of data to be reproduced in accordance with a transmission line characteristic of the reproduction system for the optical disk, and a data decision unit for deciding maximum likelihood reproduction data at present timing based on the determination result obtained by the determination unit.

摘要翻译： 系统从光盘再现数据，其中根据包括与部分响应等级I特性对应的规则的记录规则对记录数据进行编码而获得的信号被记录在其中。 该系统包括用于再现来自光盘的信号的光学头，用于在预定定时对由光头再现的信号进行采样并用于输出采样数据的模数转换器，确定单元，用于基于采样 来自模数转换器的数据，根据用于光盘的再现系统的传输线特性要再现的数据的转变状态，以及数据判定单元，用于基于当前定时决定最大似然再现数据 由确定单元获得的确定结果。

公开(公告)号：US5871855A

公开(公告)日：1999-02-16

申请号：US381474

申请日：1995-01-31

申请人： Haruhiko Izumi ,  Masakazu Taguchi ,  Tomonori Ikeya ,  Tsutomu Tanaka ,  Toshio Sugimoto ,  Ken Tamanoi

发明人： Haruhiko Izumi ,  Masakazu Taguchi ,  Tomonori Ikeya ,  Tsutomu Tanaka ,  Toshio Sugimoto ,  Ken Tamanoi

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B19/26 ,  G11B19/28 ,  G11B5/60

CPC分类号： G11B11/10597 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10584 ,  G11B11/10586 ,  G11B19/26 ,  G11B19/28 ,  Y10S428/90

摘要： A magneto-optical recording medium which is adapted to realize a partial ROM with remarkable facility in providing software. The magneto-optical recording medium comprises a transparent substrate, a volatile magnetic recording layer formed on the transparent substrate and having a Curie temperature approximately equal to or lower than a temperature raisable in a recording/reproducing apparatus of a user, and a nonvolatile magnetic recording layer formed on the volatile magnetic recording layer and having a Curie temperature higher than the temperature raisable in the recording/reproducing apparatus of the user; wherein the nonvolatile magnetic recording layer is not initialized and is retained in a state immediately after manufacture of the medium.

公开(公告)号：US5745464A

公开(公告)日：1998-04-28

申请号：US826286

申请日：1997-03-27

申请人： Masakazu Taguchi ,  Haruhiko Izumi

发明人： Masakazu Taguchi ,  Haruhiko Izumi

IPC分类号： G11B20/14 ,  G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/18

CPC分类号： G11B20/10009 ,  G11B11/10515 ,  G11B7/005

摘要： A data reproduction apparatus for reproducing data corresponding to front and rear edges of marks is recorded in an optical disk. The apparatus includes an optical head for obtaining a reproduction waveform from the optical disk, an A/D converter for obtaining a real sampling value from the reproduction waveform so as to detect an ascending edge (or a descending edge), an interpolator for obtaining a descending edge (or ascending edge) calculate sampling value through interpolation using the real sampling value, and a maximum likelihood detector for detecting a maximum likelihood signal on the basis of a real sampling value and the interpolated sampling value.

摘要翻译： 用于再现与标记的前边缘和后边缘对应的数据的数据再现装置被记录在光盘中。 该装置包括用于从光盘获得再现波形的光学头，用于从再现波形获得实际采样值以检测上升沿（或下降沿）的A / D转换器，用于获得 下降沿（或上升沿）通过使用实际采样值的内插计算采样值，以及最大似然检测器，用于基于实际采样值和内插采样值来检测最大似然信号。

公开(公告)号：US5850377A

公开(公告)日：1998-12-15

申请号：US838832

申请日：1997-04-11

申请人： Masakazu Taguchi ,  Haruhiko Izumi

发明人： Masakazu Taguchi ,  Haruhiko Izumi

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B11/105 ,  G11B20/10 ,  G11B20/12

CPC分类号： G11B20/10083 ,  G11B11/10515 ,  G11B20/10009 ,  G11B7/005 ,  G11B20/1258 ,  G11B2220/2537

摘要： A system reproduces data from an optical disk in which a signal obtained by encoding recording data in accordance with a recording rule including a rule corresponding to a partial response class I characteristic has been recorded. The system includes an optical head for reproducing a signal from the optical disk, an analog-to-digital converter for sampling the signal reproduced by the optical head at predetermined timing and for outputting sampling data, a determination unit for determining, based on the sampling data from the analog-to-digital converter, a transition state of data to be reproduced in accordance with a transmission line characteristic of the reproduction system for the optical disk, and a data decision unit for deciding maximum likelihood reproduction data at present timing based on the determination result obtained by the determination unit.

摘要翻译： 系统从光盘再现数据，其中根据包括与部分响应等级I特性对应的规则的记录规则对记录数据进行编码而获得的信号被记录在其中。 该系统包括用于再现来自光盘的信号的光学头，用于在预定定时对由光头再现的信号进行采样并用于输出采样数据的模数转换器，确定单元，用于基于采样 来自模数转换器的数据，根据用于光盘的再现系统的传输线特性要再现的数据的转变状态，以及数据判定单元，用于基于当前定时决定最大似然再现数据 由确定单元获得的确定结果。