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。

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。

公开(公告)号：US5513167A

公开(公告)日：1996-04-30

申请号：US250931

申请日：1994-05-31

申请人： Toshiki Udagawa ,  Shunji Yoshimura ,  Masumi Ohta

发明人： Toshiki Udagawa ,  Shunji Yoshimura ,  Masumi Ohta

IPC分类号： G11B7/0045 ,  G11B7/125 ,  G11B11/105 ,  G11B20/10 ,  G11B7/00

CPC分类号： G11B7/126 ,  G11B11/1053 ,  G11B11/10595 ,  G11B20/10194 ,  G11B7/0045 ,  G11B11/10506

摘要： An optical recording apparatus for recording a pulse signal on a recording medium by using a laser light beam, wherein, as shown in FIG. 4 , for example, a pattern detecting circuit (31) is provided to detect a pulse pattern of a recording signal, and an amplitude of a succeeding signal pulse is decreased in accordance with a control signal from a memory (33) when a pulse interval is not more than a predetermined value to thereby decrease a radiation energy of a laser light pulse, whereby the influence of remaining heat of the recording medium due to a laser light pulse corresponding to a preceding laser light pulse is cancelled to make it possible to record a high-density pulse signal accurately.

摘要翻译： 一种用于通过使用激光束将脉冲信号记录在记录介质上的光学记录装置，其中，如图1所示， 如图4所示，例如，提供了图案检测电路（31）来检测记录信号的脉冲图案，并且当脉冲间隔（33）的时候，根据来自存储器（33）的控制信号减小后续信号脉冲的幅度 不大于预定值，从而降低激光脉冲的辐射能量，由此消除由于与先前的激光脉冲相对应的激光脉冲引起的记录介质的剩余热量的影响，使得可以记录 高密度脉冲信号准确。

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。

公开(公告)号：US5329512A

公开(公告)日：1994-07-12

申请号：US930617

申请日：1992-09-30

申请人： Atsushi Fukimoto ,  Toshiki Udagawa ,  Shunji Yoshimura ,  Masumi Ono ,  Kouichi Yasuda

发明人： Atsushi Fukimoto ,  Toshiki Udagawa ,  Shunji Yoshimura ,  Masumi Ono ,  Kouichi Yasuda

IPC分类号： G11B7/004 ,  G11B7/005 ,  G11B7/125 ,  G11B11/105 ,  G11B19/02 ,  G11B19/04 ,  G11B33/14 ,  G11B11/10 ,  G11B7/00

CPC分类号： G11B19/046 ,  G11B11/10515 ,  G11B11/10595 ,  G11B19/02 ,  G11B19/04 ,  G11B33/144 ,  G11B7/004 ,  G11B7/005 ,  G11B7/126

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 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 beam, in which changes in the size of an effective reproducing region due to the temperature of the magneto-optical or optical recording medium may be inhibited. To this end, a temperature sensor 20 for sensing the temperature of the magneto-optical disc 11, for example, is provided and the laser power or the external magnetic field is controlled depending on the detected temperature by the temperature sensor 20 to maintain a constant size of the effective reproducing region at all times.

摘要翻译： PCT No.PCT / JP91 / 01437 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 / 14244 日期：1992年8月20日。一种用于再现磁光记录介质的方法，所述磁光记录介质的记录凹坑由于读出光束的辐射或光记录介质而由记录介质的温度升高而被擦除或释放， 其随着读出光束的辐射而导致的记录介质的温度升高而变化，其中可能抑制由于磁光或光记录介质的温度导致的有效再现区域的尺寸的变化。 为此，提供了用于感测磁光盘11的温度的温度传感器20，并且根据温度传感器20的检测温度来控制激光功率或外部磁场，以保持恒定 总是有效再现区域的大小。

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。

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。

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。

公开(公告)号：US5335213A

公开(公告)日：1994-08-02

申请号：US937876

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 ,  G11B11/00 ,  G11B11/10

CPC分类号： G11B11/10595 ,  G11B11/10515 ,  G11B7/005

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 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 beam, in which, when the line recording density of the recording medium is changed, the size of the effective reproducing region is controlled to an optimum value conforming to the line recording density to assure a stable reproducing state. To this end, with the magneto-optical disc 11 for example, being 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 an optimum value conforming to the line recording density at each reproducing position.

摘要翻译： PCT No.PCT / JP91 / 01439 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。 公开号WO92 / 15093 日期：1992年9月3日。一种用于再现磁光记录介质的方法，所述磁光记录介质的记录凹坑由于读出光束的辐射而导致的记录介质的温度升高或释放，或光记录介质的反射率 其随着读出光束的辐射而由记录介质的温度升高而改变，其中当记录介质的行记录密度改变时，有效再现区域的大小被控制为符合 线路记录密度以确保稳定的再现状态。 为此，例如利用磁光盘11以恒定的角速度旋转，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磁性 根据检测单元17的输出控制有效再现区域的大小，使其达到在每个再现位置处符合行记录密度的最佳值。

公开(公告)号：US5208799A

公开(公告)日：1993-05-04

申请号：US832384

申请日：1992-02-07

申请人： Isamu Nakao ,  Atsushi Fukumoto ,  Toshiki Udagawa ,  Shunji Yoshimura

发明人： Isamu Nakao ,  Atsushi Fukumoto ,  Toshiki Udagawa ,  Shunji Yoshimura

IPC分类号： G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10502 ,  G11B11/10532 ,  G11B11/10586

摘要： A method and apparatus for recording and reproducing information onto and from a magneto-optic recording medium is disclosed. The magneto-optic recording medium has at least a reproducing layer and a recording layer. A recording optical head records information on the magneto-optic recording medium. A reproducing optical head has a reading light beam for reading information recorded in a region within a spot of the reading light beam by magneto-optic effect by changing a state of magnetization of the reproducing layer and at the same time irradiating the recording medium with the light beam. A wavelength of the recording light beam emitted by the recording optical head is substantially smaller than a wavelength of the reading light beam emitted by the reading optical head. A minimum ratio of the wavelength of the recording light beam to that of the reproducing light beam is 1:3.