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：US5168482A

公开(公告)日：1992-12-01

申请号：US574081

申请日：1990-08-29

申请人： Katsuhisa Aratani ,  Atsushi Fukumoto ,  Masumi Ohta

发明人： Katsuhisa Aratani ,  Atsushi Fukumoto ,  Masumi Ohta

IPC分类号： G11B11/105

CPC分类号： G11B11/10517 ,  G11B11/10515 ,  G11B11/10586

摘要： A high density magnetooptical recording and playback method is disclosed. The magnetooptical recording medium comprises a recording hold magnetic layer and a playback magnetic layer magnetically coupled with each other. Prior to the playback operation, the playback magnetic layer is initialized by an external magnetic field. A laser light is irradiated to locally heat the medium and cause transfer of magnetization in the recording hold magnetic layer to the playback magnetic layer. The signal is read out by the interaction of the laser light and the transferred magnetization.

公开(公告)号：US5265074A

公开(公告)日：1993-11-23

申请号：US832579

申请日：1992-02-07

申请人： Masumi Ohta ,  Isamu Nakao ,  Katsuhisa Aratani

发明人： Masumi Ohta ,  Isamu Nakao ,  Katsuhisa Aratani

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B5/02

CPC分类号： G11B11/10586 ,  G11B11/10502

摘要： A magneto-optic recording and reproducing medium is formed of a reproduction layer composed mainly of GdFeCo and having a saturation magnetization of at least 450 emu/cc and a coercive force of not more than 4 kOe, and a recording layer composed mainly of TbFeCo, having a coercive force of at least 5 kOe, and having a magnetization of not more than 300 emu/cc when it is a transition metal-predominant film and not more than 200 emu/cc when it is a rare earth-predominant film.

公开(公告)号：US5218581A

公开(公告)日：1993-06-08

申请号：US815332

申请日：1991-12-27

申请人： Masumi Ohta ,  Katsuhisa Aratani

发明人： Masumi Ohta ,  Katsuhisa Aratani

IPC分类号： G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10584 ,  G11B11/10515 ,  G11B11/10586

摘要： The present invention is intended to improve the track recording density and track density of a magneto-optic recording medium to prevent the deterioration of characteristics due to the variation of reproducing power. After recording information signals on a magneto-optic recording medium having at least a reproducing layer, an intermediate layer and a record hold layer, the direction of magnetization of the reproducing layer is turned in the direction of a initializing magnetic field. The reproducing layer is irradiated with a laser beam and a reproducing magnetic field is applied to the same simultaneously to heat the reproducing layer in a temperature distribution so that a region remaining in an initialized state, a region to which information signals are transferred and a region magnetized in the direction of the reproducing magnetic field are formed. Magnetic signals are read from the region of the reproducing layer to which information signals have been transferred.

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：US5241520A

公开(公告)日：1993-08-31

申请号：US815330

申请日：1991-12-21

申请人： Masumi Ohta ,  Katsuhisa Aratani ,  Isamu Nakao

发明人： Masumi Ohta ,  Katsuhisa Aratani ,  Isamu Nakao

IPC分类号： G11B11/105

CPC分类号： G11B11/10593 ,  G11B11/105 ,  G11B11/10515 ,  G11B11/10523 ,  G11B11/10584 ,  G11B11/10586

摘要： A magneto-optical recording medium has a multi-layer magnetic film structure comprising a reproducing layer, an intermediate layer, and a record holding layer. These layers are magnetically coupled to one another. The recording medium is irradiated with a laser beam and appropriate magnetic fields are provided such that in a area of a spot of the laser beam on the recording medium, first, second and third regions are formed as a result of the temperature distribution within the laser beam spot. The first and third regions act as masking regions, with the second region between the first and third regions being a region from which magnetic signals stored in the record hold layer are transferred to the reproducing layer and are read out from the reproducing layer.

摘要翻译： 磁光记录介质具有包括再现层，中间层和记录保持层的多层磁性膜结构。 这些层彼此磁耦合。 记录介质用激光束照射，并且提供适当的磁场，使得在记录介质上的激光束的点的区域中，由于激光内的温度分布而形成第一，第二和第三区域 光束点。 第一和第三区域用作掩蔽区域，第一和第三区域之间的第二区域是存储在记录保持层中的磁信号从该区域传送到再现层并从再现层读出的区域。

公开(公告)号：US5230930A

公开(公告)日：1993-07-27

申请号：US832575

申请日：1992-02-07

申请人： Katsuhisa Aratani ,  Masahiko Kaneko ,  Masumi Ohta ,  Isamu Nakao

发明人： Katsuhisa Aratani ,  Masahiko Kaneko ,  Masumi Ohta ,  Isamu Nakao

IPC分类号： G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10582

摘要： A method of fabricating a magnetooptic recording medium (10) having at least a reproducing layer (11) and a recording layer (13), from which information is read out by changing the state of magnetization of the reproducing layer (11) comprises steps of forming the reproducing layer (11) on a substrate (21), putting a high-density magnetic recording medium (30) storing information in a high-density magnetic pattern into close contact with the reproducing layer (11) to copy the high-density magnetic pattern formed on the high-density magnetic recording medium (30) into the reproducing layer (11), and forming the recording layer (13) over the reproducing layer (11) after copying the high-density magnetic pattern into the reproducing layer, to copy the high-density magnetic pattern into the recording layer (13).

摘要翻译： 一种制造具有至少再现层（11）和记录层（13）的磁光记录介质（10）的方法，通过改变再现层（11）的磁化状态从中读出信息，包括步骤： 在基板（21）上形成再现层（11），将存储高密度磁图案的信息的高密度磁记录介质（30）与再现层（11）紧密接触，以将高密度 在高密度磁记录介质（30）上形成到再现层（11）中的磁图案，以及在将高密度磁图案复制到再现层中之后，在再现层（11）上形成记录层（13） 以将高密度磁图案复制到记录层（13）中。