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1.发明授权
公开(公告)号：US6031816A
公开(公告)日：2000-02-29
申请号：US330495
申请日：1999-06-11
申请人： Tetsuya Inui , Hideaki Sato , Junichiro Nakayama , Naoyasu Iketani , Michinobu Mieda , Yoshiteru Murakami , Junji Hirokane , Akira Takahashi
发明人： Tetsuya Inui , Hideaki Sato , Junichiro Nakayama , Naoyasu Iketani , Michinobu Mieda , Yoshiteru Murakami , Junji Hirokane , Akira Takahashi
CPC分类号： G11B7/005 , G11B7/00718 , G11B7/00745 , G11B7/0901 , G11B7/261 , G11B11/10578 , G11B11/10582 , G11B7/0938 , G11B7/24
摘要： An optical disk has address recording sections each of which has a wobbled part of one of side walls of a groove. Each address recording section is formed by providing convexes of a groove in an adjacent land so as to widen the groove. With the wobbles thus provided in a concavo-convex form, address information is recorded. Besides, the address recording sections thus provided in the grooves are linearly disposed in radial directions of the optical disk. By thus arranging the optical disk on whose grooves and/or lands information is recorded, mixing of wobble frequency components in reproduced information signals does not occur, the sector method is applicable to the optical disk, and information signals of high quality can be obtained.
摘要翻译： 光盘具有地址记录部分，每个地址记录部分具有凹槽的一个侧壁的摆动部分。 每个地址记录部分通过在相邻的凸台中提供凹槽的凸起来形成，以便加宽凹槽。 由于以这样提供的摆动形式为凹凸形式，所以记录地址信息。 此外，这样设置在凹槽中的地址记录部分在光盘的径向上线性地设置。 通过这样布置记录有槽和/或焊盘信息的光盘，不会发生重放信息信号中的摆动频率分量的混合，扇区方法可应用于光盘，并且可以获得高质量的信息信号。
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2.发明授权Magneto-optical recording medium with multiple magnetic layers and methods related thereto 失效具有多个磁性层的磁光记录介质及其相关方法
公开(公告)号：US5936916A
公开(公告)日：1999-08-10
申请号：US18267
申请日：1998-02-04
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00 , G11B5/66
CPC分类号： G11B11/10584 , G11B11/10519 , G11B11/10586 , G11B11/10506
摘要： If the Curie points of the first magnetic layer, second magnetic layer, third magnetic layer and fourth magnetic layer of alloys of rare-earth metal and transition metal as ferrimagnetic materials showing perpendicular magnetization from room temperature to their Curie points are indicated as Tc1, Tc2, Tc3 and Tc4, respectively, the Curie points and room temperature are related by: room temperature
摘要翻译： 如果作为铁氧体材料的稀土金属和过渡金属的合金的第一磁性层，第二磁性层，第三磁性层和第四磁性层的居里点显示出从室温到居里点的垂直磁化率，表示为Tc1，Tc2 ，Tc3和Tc4，居里点和室温分别与室温
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3.发明授权
公开(公告)号：US5633838A
公开(公告)日：1997-05-27
申请号：US582481
申请日：1996-01-03
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10515 , G11B11/10586
摘要： A non-magnetic intermediate layer is provided between a reproductive layer and a recording layer. The reproductive layer is composed of a first reproductive layer and a second reproductive layer. When the first reproductive layer has a temperature that is higher than a first critical temperature, its stable magnetic domain width becomes smaller than a recording magnetic domain width so that the magnetization is reversed. When the second reproductive layer has a temperature that is higher than a second critical temperature, its stable magnetic domain width becomes larger than the recording magnetic domain width so that the reversed magnetic domain is collapsed. The first critical temperature is lower than the second critical temperature. A reproductive output having abrupt rising and falling can be obtained by the generation and the collapse of the reverse magnetic domain on the reproductive layer. For this reason, higher density recording required for larger capacity can be achieved.
摘要翻译： 在生殖层和记录层之间设置非磁性中间层。 生殖层由第一生殖层和第二生殖层组成。 当第一生殖层具有高于第一临界温度的温度时，其稳定的磁畴宽度变得小于记录磁畴宽度，使得磁化反转。 当第二生殖层具有高于第二临界温度的温度时，其稳定的磁畴宽度变得大于记录磁畴宽度，使得反向磁畴被折叠。 第一临界温度低于第二临界温度。 具有突然上升和下降的生殖输出可以通过生殖层上的反向磁畴的产生和崩溃获得。 为此，可以实现更大容量所需的更高密度的记录。
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4.发明授权Magneto-optical recording apparatus having paired devices for applying external magnetic fields 失效具有用于施加外部磁场的配对装置的磁光记录装置
公开(公告)号：US5530685A
公开(公告)日：1996-06-25
申请号：US330744
申请日：1994-10-28
申请人： Hiroyuki Katayama , Junichiro Nakayama , Michinobu Mieda , Junji Hirokane , Akira Takahashi , Kenji Ohta
发明人： Hiroyuki Katayama , Junichiro Nakayama , Michinobu Mieda , Junji Hirokane , Akira Takahashi , Kenji Ohta
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10554 , G11B11/10521 , G11B11/10523 , G11B11/10552
摘要： A magneto-optical recording apparatus of the present invention is provided with an objective lens for focusing a light beam onto a magneto-optical recording medium. A pair of magnets is disposed on opposite sides of the magneto-optical recording medium and apply a writing magnetic field onto a portion of the magneto-optical recording medium that has been irradiated by the light beam while applying an initializing magnetic field greater than the writing magnetic field onto a portion apart from that irradiated by the light beam.
摘要翻译： 本发明的磁光记录装置设置有用于将光束聚焦到磁光记录介质上的物镜。 一对磁体设置在磁光记录介质的相对侧上，并将写入磁场施加到已经被光束照射的磁光记录介质的一部分上，同时施加大于写入的初始化磁场 磁场到除了被光束照射的部分之外的部分。
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5.发明授权
公开(公告)号：US5629908A
公开(公告)日：1997-05-13
申请号：US536168
申请日：1995-09-29
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10586 , G11B11/10506 , G11B11/10515 , G11B11/10521 , G11B11/10595
摘要： A magneto-optical recording medium comprising a readout layer, an intermediate layer, and a recording layer. Two light beams having high and low light intensities respectively are applied while applying an external magnetic field. The magnetization direction of the recording layer is changed according to information, by reversing the sub-lattice magnetic moment of the readout layer in the case of the high light intensity. The intermediate layer exhibits a perpendicular magnetization during the irradiation, and also exhibits an in-plane magnetization at room temperature. Since it is not necessary to provide a device for generating a magnetic field for initializing every recording, it is possible to avoid increase in the size of the recording and reproducing apparatus. Moreover, the magnetization direction of the readout layer can be easily controlled with an external magnetic field, and the optical modulation overwriting property can be stabilized.
摘要翻译： 包括读出层，中间层和记录层的磁光记录介质。 在施加外部磁场的同时施加具有高和低光强度的两个光束。 在高光强度的情况下，通过反转读出层的亚晶格磁矩，根据信息改变记录层的磁化方向。 中间层在照射期间表现出垂直磁化，并且在室温下也表现出平面内的磁化强度。 由于不需要提供用于产生用于初始化每个记录的磁场的装置，因此可以避免记录和再现装置的尺寸的增加。 此外，可以通过外部磁场容易地控制读出层的磁化方向，并且可以稳定光学调制重写特性。
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6.发明授权Optical recording medium having a wobbling section for recording address information and methods of recording and reproduction using same 失效具有用于记录地址信息的摆动部分和使用其的记录和再现方法的光学记录介质
公开(公告)号：US5933411A
公开(公告)日：1999-08-03
申请号：US890401
申请日：1997-07-09
申请人： Tetsuya Inui , Hideaki Sato , Junichiro Nakayama , Naoyasu Iketani , Michinobu Mieda , Yoshiteru Murakami , Junji Hirokane , Akira Takahashi
发明人： Tetsuya Inui , Hideaki Sato , Junichiro Nakayama , Naoyasu Iketani , Michinobu Mieda , Yoshiteru Murakami , Junji Hirokane , Akira Takahashi
CPC分类号： G11B7/005 , G11B7/00718 , G11B7/00745 , G11B7/0901 , G11B7/261 , G11B11/10578 , G11B11/10582 , G11B7/0938 , G11B7/24
摘要： An optical disk has address recording sections each of which has a wobbled part of one of side walls of a groove. Each address recording section is formed by providing convexes of a groove in an adjacent land so as to widen the groove. With the wobbles thus provided in a concavo-convex form, address information is recorded. Besides, the address recording sections thus provided in the grooves are linearly disposed in radial directions of the optical disk. By thus arranging the optical disk on whose grooves and/or lands information is recorded, mixing of wobble frequency components in reproduced information signals does not occur, the sector method is applicable to the optical disk, and information signals of high quality can be obtained.
摘要翻译： 光盘具有地址记录部分，每个地址记录部分具有凹槽的一个侧壁的摆动部分。 每个地址记录部分通过在相邻的凸台中提供凹槽的凸起来形成，以便加宽凹槽。 由于以这样提供的摆动形式为凹凸形式，所以记录地址信息。 此外，这样设置在凹槽中的地址记录部分在光盘的径向上线性地设置。 通过这样布置记录有槽和/或焊盘信息的光盘，不会发生重放信息信号中的摆动频率分量的混合，扇区方法可应用于光盘，并且可以获得高质量的信息信号。
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7.发明授权Magneto-optical recording medium and method of recording and reproducing using the same 失效磁光记录介质及使用其的记录和再现方法
公开(公告)号：US5683803A
公开(公告)日：1997-11-04
申请号：US433088
申请日：1995-05-03
IPC分类号： G11B11/10 , G11B11/105 , G11B5/66 , B32B5/16
CPC分类号： G11B11/10586 , G11B11/10506 , G11B11/10515 , G11B11/10523 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： A magneto-optical recording medium includes a first magnetic layer and a second magnetic layer being laminated. When information is to be recorded on the first magnetic layer, first, a magnetization direction in the second magnetic layer is arranged in one direction with an application of an initialization magnetic field. Then, an intensity modulated light beam is projected while applying thereto a recording magnetic field so as to change the magnetization direction in the second magnetic layer. Thereafter, the magnetization direction in the second magnetic layer is copied to the first magnetic layer, thereby recording information. The first magnetic layer has a magnetization in an intermediate direction between a perpendicular direction and an in-plane direction at room temperature, while has a perpendicular magnetization at above a predetermined temperature. Therefore, a smaller exchange coupling force is exerted from the first magnetic layer to the second magnetic layer at room temperature, thereby enabling a rewriting information with a smaller initialization magnetic field compared with the conventional method, thereby achieving a reduction in size of the apparatus and power conservation.
摘要翻译： 磁光记录介质包括层叠的第一磁性层和第二磁性层。 当要在第一磁性层上记录信息时，首先，通过施加初始化磁场，将第二磁性层中的磁化方向布置在一个方向上。 然后，施加强度调制光束，同时向其施加记录磁场，以改变第二磁性层中的磁化方向。 此后，将第二磁性层中的磁化方向复制到第一磁性层，从而记录信息。 第一磁性层在室温下具有在垂直方向和面内方向之间的中间方向上的磁化强度，同时具有高于预定温度的垂直磁化强度。 因此，与常规方法相比，在室温下从第一磁性层向第二磁性层施加较小的交换耦合力，从而能够实现与常规方法相比具有较小初始化磁场的重写信息，从而实现装置的尺寸减小 省电。
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公开(公告)号：US5982713A
公开(公告)日：1999-11-09
申请号：US719753
申请日：1996-09-25
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10586
摘要： A magneto-optical recording medium includes first, second, and third magnetic layers laminated in this order. The first magnetic layer, made of a rare earth-transition metal alloy, has a great coercive force at room temperature and is transition metal rich in a temperature range between room temperature and a Curie temperature of the first magnetic layer. The second magnetic layer, made of a rare earth-transition metal alloy, has a Curie temperature higher than that of the first magnetic layer and is rare-earth metal rich at room temperature. The third magnetic layer, made of a rare earth-transition metal alloy, has a Curie temperature higher than that of the first magnetic layer, and a compensation temperature falling in a temperature range between room temperature and the Curie temperature of the third magnetic layer. A magnetization of the third magnetic layer is transferred to the first magnetic layer at a temperature higher than room temperature. A perpendicular magnetic anisotropy Ku3 satisfies 0.3.times.10.sup.6 erg/cc
摘要翻译： 磁光记录介质包括依次层叠的第一，第二和第三磁性层。 由稀土 - 过渡金属合金制成的第一磁性层在室温下具有很大的矫顽力，并且是在室温和第一磁性层的居里温度之间的温度范围内富含过渡金属。 由稀土 - 过渡金属合金制成的第二磁性层的居里温度高于第一磁性层的居里温度，并且在室温下富含稀土金属。 由稀土 - 过渡金属合金制成的第三磁性层的居里温度高于第一磁性层的居里温度，并且补偿温度落在室温和第三磁性层的居里温度之间的温度范围内。 在高于室温的温度下将第三磁性层的磁化转移到第一磁性层。 垂直磁各向异性Ku3满足0.3×10 6 erg / cc
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公开(公告)号：US5838645A
公开(公告)日：1998-11-17
申请号：US866594
申请日：1997-05-30
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10515 , G11B11/10586
摘要： A magneto-optical disk provided with a record layer having a recording magnetic domain where data are recorded, an auxiliary reproduction layer for transferring the record data in the record layer to a reproduction layer by generating a floating magnetic field corresponding to the data in the record layer, and the reproduction layer from which the data are read out through irradiation of a light beam, which are sequentially layered while interposing nonmagnetic intermediate layers therebetween. The stable magnetic domain width in the auxiliary reproduction layer is shorter than the recording magnetic domain width at room temperature and extends as the temperature rises and becomes longer at or above a first temperature. The stable magnetic domain width in the reproduction layer is longer than the recording magnetic domain width at room temperature and lessens as the temperature rises and becomes shorter at or above a second temperature which is lower than the first temperature. The first and second temperatures satisfy a condition expressed as: room temperature
摘要翻译： 具有记录数据的记录磁畴的磁光盘，用于通过产生与记录中的数据相对应的浮动磁场将记录层中的记录数据传送到再现层的辅助再现层 层，以及通过照射光束从中读出数据的再现层，它们在其间插入非磁性中间层的顺序层叠。 辅助再生层中的稳定的磁畴宽度比室温下的记录磁畴宽度短，随着温度升高而延长，在第一温度以上也变长。 再生层中的稳定的磁畴宽度比室温下的记录磁畴宽度长，随着温度的升高而降低，在比第一温度低的第二温度以上也变短。 第一和第二温度满足条件表示为：室温<第二温度<第一温度APPROXLESS光束点中的最大温度。 因此，在再现层中立即产生并擦除反向磁畴，并且所得到的再现信号是矩形信号，从而可以提供能够精确地再现高密度记录数据的磁光记录介质。
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公开(公告)号：US5684764A
公开(公告)日：1997-11-04
申请号：US595259
申请日：1996-02-01
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10515 , G11B11/10586
摘要： A magneto-optical disk provided with a record layer having a recording magnetic domain where data are recorded, an auxiliary reproduction layer for transferring the record data in the record layer to a reproduction layer by generating a floating magnetic field corresponding to the data in the record layer, and the reproduction layer from which the data are read out through irradiation of a light beam, which are sequentially layered while interposing non-magnetic intermediate layers therebetween. The stable magnetic domain width in the auxiliary reproduction layer is shorter than the recording magnetic domain width at room temperature and extends as the temperature rises and becomes longer at or above a first temperature. The stable magnetic domain width in the reproduction layer is longer than the recording magnetic domain width at room temperature and lessens as the temperature rises and becomes shorter at or above a second temperature which is lower than the first temperature. The first and second temperatures satisfy a condition expressed as: room temperature
摘要翻译： 具有记录数据的记录磁畴的磁光盘，用于通过产生与记录中的数据相对应的浮动磁场将记录层中的记录数据传送到再现层的辅助再现层 层，以及通过照射光束从中读出数据的再现层，它们在介于其间的非磁性中间层的顺序层叠。 辅助再生层中的稳定的磁畴宽度比室温下的记录磁畴宽度短，随着温度升高而延长，在第一温度以上也变长。 再生层中的稳定的磁畴宽度比室温下的记录磁畴宽度长，随着温度的升高而降低，在比第一温度低的第二温度以上也变短。 第一和第二温度满足表示为：室温<第二温度<第一温度
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