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1. 发明授权

US06421304B1 Magneto-optical reproducing apparatus using magnetic wall displacement detector 失效
标题翻译：使用磁性壁位移检测器的磁光再现装置
公开(公告)号：US06421304B1
公开(公告)日：2002-07-16
申请号：US09551428
申请日：2000-04-18
申请人： Shunji Yoshimura , Atsushi Fukumoto , Shinichi Kai
发明人： Shunji Yoshimura , Atsushi Fukumoto , Shinichi Kai
IPC分类号： G11B1100
CPC分类号： G11B11/10515 , G11B20/10009
摘要： A magneto-optical reproducing apparatus for reproducing from a magnetic film medium having at least a displacement layer, a switching layer, and a memory layer. A magnetic wall displacement is generated in the displacement layer in any region where the temperature exceeds the Curie temperature of the switching layer to effectively enlarge any recorded magnetic domain. The reproduced signal from the magnetic film medium is equalized with regard to waveform in an equalizer circuit and then fed to a magnetic wall displacement detection circuit that produces a magnetic wall displacement signal by using a differential signal or a secondary differential signal of the reproduced signal so as to provide a low bit error rate despite any sudden DC level variation in the reproduced signal.
摘要翻译：一种用于从至少具有位移层，开关层和存储层的磁性膜介质再现的磁光再现装置。在温度超过开关层的居里温度的任何区域中的位移层中产生磁性壁位移，以有效地扩大任何记录的磁畴。来自磁性膜介质的再现信号相对于均衡器电路中的波形而均衡，然后馈送到通过使用再现信号的差分信号或次级差分信号产生磁性壁位移信号的磁性壁位移检测电路，以便尽管再现信号中的任何突然的DC电平变化都提供低的误码率。

2. 发明授权

US5380573A Optical recording medium 失效
标题翻译：光记录介质
公开(公告)号：US5380573A
公开(公告)日：1995-01-10
申请号：US930702
申请日：1992-10-06
申请人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura , Masumi Ohta , Masumi Ono , Kouichi Yasuda
发明人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura , Masumi Ohta , Masumi Ono , Kouichi Yasuda
IPC分类号： G11B7/005 , G11B11/105 , B32B3/00
CPC分类号： G11B7/005 , G11B11/105 , G11B11/10528 , G11B11/10584 , Y10S428/913 , Y10T428/31678
摘要： An optical recording medium has a multi-layer film including a reproducing layer and a recording holding layer, in which, while a readout light is radiated to the optical recording medium for transcribing signals magnetically recorded in the recording holding layer to the reproducing layer, the signals are converted by photomagnetic effects into optical signals which are read. Alternately, an optical recording medium has phase pits formed thereon in accordance with signals and changed in reflectance with temperature, in which, while a readout light beam is radiated to the optical recording medium and the reflectance is changed partially within a scanning spot the readout light beam, the phase pits are read. The track pitch p of pits RP of recording signals in a direction at right angles to the scanning direction of the laser light is set to not more than one-half the spot diameter of the laser light to raise the track density to improve the recording capacity of the recording medium.
摘要翻译： PCT No.PCT / JP91 / 01436 Sec。 371日期：1992年10月6日 102（e）日期1992年10月6日PCT 1991年10月18日PCT PCT。公开号WO92 / 15092 日期：1992年9月3日。光记录介质具有包括再现层和记录保持层的多层膜，其中，当将读出光照射到用于转录磁记录在记录保持中的信号的光记录介质层到再现层，信号被光磁效应转换成被读取的光信号。或者，光记录介质根据信号形成在其上的相位凹坑，并随着温度反射而变化，其中当将读出光束照射到光记录介质上并且反射率在扫描点内部分地改变时，读出光光束，读取相位坑。与激光的扫描方向成直角的记录信号的凹坑RP的轨道间距p被设定为不大于激光的光点直径的一半，以提高轨道密度以提高记录容量的记录介质。

3. 发明授权

US06940800B2 Reproduced signal evaluation apparatus and method, reproduction apparatus and method, and recording apparatus and method 失效
标题翻译：再生信号评价装置及方法，再现装置和方法以及记录装置和方法
公开(公告)号：US06940800B2
公开(公告)日：2005-09-06
申请号：US10017156
申请日：2001-12-14
申请人： Kensuke Fujimoto , Shunji Yoshimura , Atsushi Fukumoto , Yasuhito Tanaka
发明人： Kensuke Fujimoto , Shunji Yoshimura , Atsushi Fukumoto , Yasuhito Tanaka
IPC分类号： G11B7/0045 , G11B7/005 , G11B20/10 , G11B20/18 , H03M13/39 , H03M13/41 , G11B5/76
CPC分类号： G11B20/10009 , G11B7/005 , G11B7/1267 , G11B11/10515 , G11B11/1053 , G11B11/10595 , G11B20/10 , G11B20/18 , G11B20/1833 , H03M13/3961 , H03M13/41 , H03M13/6343
摘要： The present invention provides an apparatus and a method for precisely and adequately evaluating actual quality of reproduced data whenever applying a maximum likelihood decoder for converting signal reproduced from a recording medium into binary signal. Based on data arrays of a pair of binary data outputted from a “Viterbi” decoder, SAM values are secured by selecting any of path-metric differential values (00) and (11) being the difference between a pair of values compared when renewing path-metric values PMM (00) and (11) outputted from the “Viterbi” decoder. The minimum SAM value for an ideally-reproduced signal is outputted from a constant generating circuit. If the SAM values are verified as valid, and yet, if the SAM values coincide with the equation “input SAM values”≦“data value outputted from the constant generating circuit”, then squared values outputted from a square circuit are averaged by an averaging circuit. Finally, the average value is outputted as the reproduced signal evaluation.
摘要翻译：本发明提供了一种用于在应用用于将从记录介质再现的信号转换成二进制信号的最大似然解码器时，精确且充分地评估再现数据的实际质量的装置和方法。基于从“维特比”解码器输出的一对二进制数据的数据阵列，通过选择路径度量差分值（00）和（11）中的任一个作为在更新路径上比较的一对值之间的差异来确保SAM值从“维特比”解码器输出的测量值PMM（00）和（11）。理想再现信号的最小SAM值从恒定发生电路输出。如果SAM值被验证为有效，然而，如果SAM值与从常数产生电路输出的等式“输入SAM值”<=“数据值”一致，则从平方电路输出的平方值由平均电路。最后，平均值作为再现信号评估输出。

4. 发明申请

US20050190630A1 Reproduced signal evaluation apparatus and method, reproduction apparatus and method, and recording apparatus and method 有权
标题翻译：再生信号评价装置及方法，再现装置和方法以及记录装置和方法
公开(公告)号：US20050190630A1
公开(公告)日：2005-09-01
申请号：US11113557
申请日：2005-04-25
申请人： Kensuke Fujimoto , Shunji Yoshimura , Atsushi Fukumoto , Yasuhito Tanaka
发明人： Kensuke Fujimoto , Shunji Yoshimura , Atsushi Fukumoto , Yasuhito Tanaka
IPC分类号： G11B7/0045 , G11B7/005 , G11B20/10 , G11B20/18 , H03M13/39 , H03M13/41 , G11C8/00
CPC分类号： G11B20/10009 , G11B7/005 , G11B7/1267 , G11B11/10515 , G11B11/1053 , G11B11/10595 , G11B20/10 , G11B20/18 , G11B20/1833 , H03M13/3961 , H03M13/41 , H03M13/6343
摘要： The present invention provides an apparatus and a method for precisely and adequately evaluating actual quality of reproduced data whenever applying a maximum likelihood decoder for converting signal reproduced from a recording medium into binary signal Based on data arrays of a pair of binary data outputted from a “Viterbi” decoder, SAM values are secured by selecting any of path-metric differential values (00) and (11) being the difference between a pair of values compared when renewing path-metric values PMM (00) and (11) outputted from the “Viterbi” decoder. The minimum SAM value for an ideally-reproduced signal is outputted from a constant generating circuit. If the SAM values are verified as valid, and yet, if the SAM values coincide with the equation “input SAM values”≦“data value outputted from the constant generating circuit”, then squared values outputted from a square circuit are averaged by an averaging circuit. Finally, the average value is outputted as the reproduced signal evaluation.
摘要翻译：本发明提供了一种用于在将用于将从记录介质再现的信号转换为二进制信号的最大似然解码器的情况下精确地和适当地评估再现数据的实际质量的装置和方法。基于从“ 维特比“解码器，通过选择路径度量差分值（00）和（11）中的任何一个来确保SAM值，所述差分值是当从更新路由度量值PMM（00）和（11）更新时比较的一对值之间的差 “维特比”解码器。理想再现信号的最小SAM值从恒定发生电路输出。如果SAM值被验证为有效，然而，如果SAM值与从常数产生电路输出的等式“输入SAM值”<=“数据值”一致，则从平方电路输出的平方值由平均电路。最后，平均值作为再现信号评估输出。

5. 发明授权

US5371722A Method for recording sector control information on magneto-optical disk 失效
标题翻译：用于记录磁光盘上的扇区控制信息的方法
公开(公告)号：US5371722A
公开(公告)日：1994-12-06
申请号：US106487
申请日：1993-08-13
申请人： Shunji Yoshimura , Toshiki Udagawa , Atsushi Fukumoto
发明人： Shunji Yoshimura , Toshiki Udagawa , Atsushi Fukumoto
IPC分类号： G11B11/10 , G11B7/007 , G11B11/105 , G11B20/12 , G11B27/10 , G11B13/04
CPC分类号： G11B11/10515 , G11B11/10578 , G11B20/1217 , G11B7/00745 , G11B2220/2525 , G11B2220/2537
摘要： Disclosed is a method for recording and reproducing sector control information to and from a novel magneto-optical disk to which the so-called erasure type data reproduction method or data-embossed type reproduction method applies. On the magneto-optical disk, sector control information is recorded onto a sector control information recording region at a track recording density lower than that of a data recording region. When data is recorded on the disk at a high track density, the sector control information is recorded in such a manner that the information will not exist on adjacent tracks along the same radials of the disk.
摘要翻译：公开了一种用于将扇区控制信息记录到新磁光盘的方法，所述新型磁光盘适用于所谓的擦除型数据再现方法或数据压印类型再现方法。在磁光盘上，扇区控制信息以比数据记录区域低的磁道记录密度被记录在扇区控制信息记录区上。当以高磁道密度将数据记录在磁盘上时，扇区控制信息以这样一种方式被记录，即信息将不会存在于沿盘的相同径向的相邻轨道上。

6. 发明授权

US07200094B2 Reproduced signal evaluation apparatus and method, reproduction apparatus and method, and recording apparatus and method 有权
标题翻译：再生信号评价装置及方法，再现装置和方法以及记录装置和方法
公开(公告)号：US07200094B2
公开(公告)日：2007-04-03
申请号：US11113557
申请日：2005-04-25
申请人： Kensuke Fujimoto , Shunji Yoshimura , Atsushi Fukumoto , Yasuhito Tanaka
发明人： Kensuke Fujimoto , Shunji Yoshimura , Atsushi Fukumoto , Yasuhito Tanaka
IPC分类号： G11B5/76
CPC分类号： G11B20/10009 , G11B7/005 , G11B7/1267 , G11B11/10515 , G11B11/1053 , G11B11/10595 , G11B20/10 , G11B20/18 , G11B20/1833 , H03M13/3961 , H03M13/41 , H03M13/6343
摘要： The present invention provides an apparatus and a method for precisely and adequately evaluating actual quality of reproduced data whenever applying a maximum likelihood decoder for converting signal reproduced from a recording medium into binary signal Based on data arrays of a pair of binary data outputted from a “Viterbi” decoder, SAM values are secured by selecting any of path-metric differential values (00) and (11) being the difference between a pair of values compared when renewing path-metric values PMM (00) and (11) outputted from the “Viterbi” decoder. The minimum SAM value for an ideally-reproduced signal is outputted from a constant generating circuit. If the SAM values are verified as valid, and yet, if the SAM values coincide with the equation “input SAM values”≦“data value outputted from the constant generating circuit”, then squared values outputted from a square circuit are averaged by an averaging circuit. Finally, the average value is outputted as the reproduced signal evaluation.
摘要翻译：本发明提供了一种用于在将用于将从记录介质再现的信号转换为二进制信号的最大似然解码器的情况下精确地和适当地评估再现数据的实际质量的装置和方法。基于从“ 维特比“解码器，通过选择路径度量差分值（00）和（11）中的任何一个来确保SAM值，所述差分值是当从更新路由度量值PMM（00）和（11）更新时比较的一对值之间的差 “维特比”解码器。理想再现信号的最小SAM值从恒定发生电路输出。如果SAM值被验证为有效，然而，如果SAM值与从常数产生电路输出的等式“输入SAM值”<=“数据值”一致，则从平方电路输出的平方值由平均电路。最后，平均值作为再现信号评估输出。

7. 发明授权

US5579294A Magneto-optical medium and recording and/or reproducing apparatus thereof 失效
标题翻译：磁光介质及其记录和/或再现装置
公开(公告)号：US5579294A
公开(公告)日：1996-11-26
申请号：US299544
申请日：1994-09-01
申请人： Masumi Ohta , Isamu Nakao , Toshiki Udagawa , Atsushi Fukumoto , Shunji Yoshimura
发明人： Masumi Ohta , Isamu Nakao , Toshiki Udagawa , Atsushi Fukumoto , Shunji Yoshimura
IPC分类号： G11B11/105 , G11B19/12 , G11B7/00
CPC分类号： G11B11/10597 , G11B11/10515 , G11B11/10586 , G11B19/12
摘要： An apparatus for recording and/or reproducing a magneto-optical recording medium having a recording layer, a reproducing layer and an intermediate layer for magnetically coupling the recording layer and the reproducing layer in a stationary state, in which the magnetic coupling between the recording layer and the reproducing layer is only able to take place in an area in which a temperature is increased to be higher than a predetermined temperature by the radiation of a light upon reproducing and in which a recorded information held in the recording layer is read out from the reproducing layer in the radiated area. This magneto-optical recording medium is characterized in that a Curie temperature of the intermediate layer is selected to be 150.degree. C. or more. Also, an apparatus which performs the above-mentioned functions and additionally which is capable of recording and/or reproducing conventional magneto-optical discs which reproduce and/or record over the entire area of irradiation.
摘要翻译：一种用于记录和/或再现具有记录层，再现层和中间层的磁光记录介质的装置，用于在静止状态下将记录层和再现层磁耦合，其中记录层并且再现层仅能够通过再现时的光的辐射而在温度升高到高于预定温度的区域中发生，并且其中记录在记录层中的记录信息从再现层在辐射区域。该磁光记录介质的特征在于，中间层的居里温度选择为150℃以上。此外，还执行上述功能的装置，并且另外能够记录和/或再现在整个照射区域上再现和/或记录的常规磁光盘。

8. 发明授权

US5432774A Optical recording medium 失效
标题翻译：光记录介质
公开(公告)号：US5432774A
公开(公告)日：1995-07-11
申请号：US930701
申请日：1992-10-06
申请人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura , Masumi Ono , Kouichi Yasuda
发明人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura , Masumi Ono , Kouichi Yasuda
IPC分类号： G11B7/005 , G11B11/105 , G11B7/09
CPC分类号： G11B7/005 , G11B11/10504 , G11B11/10515 , G11B11/10528 , G11B11/10586
摘要： An optical recording medium has a multi-layer film including a reproducing layer and a recording holding layer magnetically coupled to each other as a recording film. While a readout light is radiated to the optical recording medium for erasing the recording holding layer and the reproducing layer or transcribing signals magnetically recorded in the recording holding layer to the reproducing layer, the signals are converted by photomagnetic effects into optical signals which are read, or an optical recording medium having phase pits changed in reflectance with temperature. While a readout light beam is radiated to the optical recording medium and the reflectance is changed partially within a scanning spot of the readout light beam, the phase pits are read. The minimum pit interval of the recording signals along the scanning direction of the readout light beam is selected to be not more than .lambda./2NA, where .lambda. is the wavelength of the readout light beam, and NA is the numerical aperture of an objective lens for raising the recording line density and the recording capacity of the recording medium.
摘要翻译： PCT No.PCT / JP91 / 01435 Sec。 371日期：1992年10月6日 102（e）日期1992年10月6日PCT 1991年10月18日PCT PCT。出版物WO92 / 15091 日期：1992年9月3日。光记录介质具有包括作为记录膜彼此磁耦合的再现层和记录保持层的多层膜。当读出光被照射到用于擦除记录保持层和再现层的光学记录介质或将磁记录在记录保持层中的信号转录到再现层时，信号通过光磁效应被转换成被读取的光信号，或具有随温度变化的相位凹坑的光记录介质。当读出光束被照射到光学记录介质并且反射率在读出光束的扫描点内部分地改变时，读取相位凹坑。沿着读出光束的扫描方向的记录信号的最小凹坑间隔被选择为不大于λ/ 2NA，其中λ是读出光束的波长，NA是物镜的数值孔径，用于提高记录线密度和记录介质的记录容量。

9. 发明授权

US5390162A Method for reproducing signals recorded on optical recording medium 失效
标题翻译：用于再现记录在光学记录介质上的信号的方法
公开(公告)号：US5390162A
公开(公告)日：1995-02-14
申请号：US941058
申请日：1992-09-30
申请人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura , Masumi Ono , Kouichi Yasuda
发明人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura , Masumi Ono , Kouichi Yasuda
IPC分类号： G11B7/005 , G11B11/105 , G11B19/02 , G11B11/10 , G11B11/03
CPC分类号： G11B7/005 , G11B11/10515 , G11B11/10595 , G11B19/02
摘要： A method for reproducing a magneto-optical recording medium the recording pits of which are erased or relieved with rise in temperature of the recording medium caused by radiation of a readout light beam or an optical recording medium the reflectance of which is changed with rise in temperature of the recording medium caused by radiation of the readout light beam, in which changes in the size of an effective reproducing region due to the temperature of the recording medium may be inhibited. To this end, when the magneto-optical disc 11, for example, is rotated at a constant angular velocity, a detecting unit 17 is provided for detecting the radial position of the magneto-optical disc 11 and the laser power as well as the external magnetic field is controlled depending on an output of the detecting unit 17 for controlling the size of an effective reproducing region to be constant without regard to the linear velocity at each reproducing position.
摘要翻译： PCT No.PCT / JP91 / 01438 Sec。 371日期：1992年9月30日 102（e）日期1992年9月30日PCT 1991年10月19日PCT公布。出版物WO92 / 14245 日期：1992年8月20日。一种用于再现磁光记录介质的方法，所述磁光记录介质由于读出光束或光记录介质的辐射而被记录介质的温度升高而被擦除或释放，其随着读取光束的辐射而导致的记录介质的温度升高而改变，其中由于记录介质的温度导致的有效再现区域的尺寸的变化可能被抑制。为此，例如当磁光盘11以恒定的角速度旋转时，提供检测单元17用于检测磁光盘11的径向位置和激光功率以及外部根据检测单元17的输出控制磁场，用于将有效再现区域的大小控制为恒定，而不考虑每个再现位置处的线速度。

10. 发明授权

US5367509A Method for reproducing information recorded on a magneto-optical recording medium including servo controlling the dimension of the reproduction region of the recording medium by means of a recorded signal 失效
标题翻译：用于再现记录在磁光记录介质上的信息的方法，包括通过记录信号控制记录介质的再现区域的尺寸的伺服
公开(公告)号：US5367509A
公开(公告)日：1994-11-22
申请号：US233555
申请日：1994-04-26
申请人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura
发明人： Atsushi Fukumoto , Toshiki Udagawa , Shunji Yoshimura
IPC分类号： G11B7/125 , G11B11/10 , G11B11/105 , G11B13/04 , G11B11/12
CPC分类号： G11B11/10515 , G11B11/10595
摘要： This invention is directed to an improvement in a novel magneto-optical disc reproducing method of the record information erasing type or the record information raised or transfer type wherein a technique is employed to prevent the dimension of an actual reproduction region from varying by a change of temperature or linear velocity of a magneto-optical disc. To realize this, reference information is recorded on a magneto-optical disc to reproduce this reference information prior to actual data reproduction to detect the regenerative RF signal level to control a laser power or an external magnetic field so that the regenerative RF signal level becomes equal to a level optimum for reproduction, thus allowing the dimension of an actual reproduction region to be an optimum fixed dimension at all times. At the time of actual reproduction, control is made so that the controlled laser power or external magnetic field is maintained.
摘要翻译：本发明旨在改进记录信息擦除类型或记录信息提升或传输类型的新型磁光盘再现方法，其中采用一种技术来防止实际再现区域的尺寸由于磁光盘的温度或线速度。为了实现这一点，将参考信息记录在磁光盘上以在实际数据再现之前再现该参考信息，以检测再生RF信号电平以控制激光功率或外部磁场，使得再生RF信号电平变得相等达到最佳的再现水平，从而允许实际再现区域的尺寸始终为最佳固定尺寸。在实际再现时，进行控制以保持受控激光功率或外部磁场。

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