公开(公告)号：US5982715A

公开(公告)日：1999-11-09

申请号：US116328

申请日：1998-07-15

申请人： Go Mori ,  Naoyasu Iketani ,  Michinobu Mieda ,  Ippei Suzuki ,  Junji Hirokane ,  Akira Takahashi

发明人： Go Mori ,  Naoyasu Iketani ,  Michinobu Mieda ,  Ippei Suzuki ,  Junji Hirokane ,  Akira Takahashi

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

CPC分类号： G11B11/10584 ,  G11B11/10593 ,  G11B11/10515

摘要： A magneto-optical recording medium with a reproducing layer that exhibits in-plane magnetization at room temperature and that comes to exhibit perpendicular magnetization as temperature rises. The second shielding layer is used to block the magnetization of record bits other than a record bit to be reproduced from being copied on a signal reproducing area in the reproducing layer. Consequently, even in the case of high-density record bits in the recording layer, only the magnetization of the record bit to be reproduced is copied on the reproducing layer. Therefore, the application of the magneto-optical recording medium makes it possible to produce superior reproducing signals even in the case where the records bits with high density are formed on the recording layer.

摘要翻译： 一种具有再现层的磁光记录介质，其在室温下表现出平面内的磁化，并且随着温度升高而呈现垂直磁化强度。 第二屏蔽层用于阻止除被再现的记录位之外的记录位的磁化被复制在再现层中的信号再现区上。 因此，即使在记录层中的高密度记录位的情况下，只有将再现的记录位的磁化复制在再现层上。 因此，即使在记录层上形成具有高密度的记录位的情况下，也可以应用磁光记录介质来产生优良的再现信号。

公开(公告)号：US5936916A

公开(公告)日：1999-08-10

申请号：US18267

申请日：1998-02-04

申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

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

公开(公告)号：US5633838A

公开(公告)日：1997-05-27

申请号：US582481

申请日：1996-01-03

申请人： Junji Hirokane ,  Junichiro Nakayama ,  Michinobu Mieda ,  Akira Takahashi

发明人： Junji Hirokane ,  Junichiro Nakayama ,  Michinobu Mieda ,  Akira Takahashi

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。

公开(公告)号：US5666345A

公开(公告)日：1997-09-09

申请号：US203619

申请日：1994-02-28

申请人： Akira Takahashi ,  Tetsuya Inui ,  Kenji Ohta ,  Toshihisa Deguchi ,  Kazuo Van

发明人： Akira Takahashi ,  Tetsuya Inui ,  Kenji Ohta ,  Toshihisa Deguchi ,  Kazuo Van

IPC分类号： G11B7/007 ,  G11B7/013 ,  G11B7/09 ,  G11B7/24

CPC分类号： G11B7/24085 ,  G11B7/0938 ,  G11B7/007

摘要： An optical memory disc medium contains a plurality of guide groove tracks. The guide groove tracks are arranged parallel to each other and they are used for controlling a position of a light beam. There is a land region between the guide groove tracks which is wider than the width of the guide groove tracks as measured in the disc-radial direction. Prepits for providing address information for the guide groove tracks are provided. The prepits are formed on the land regions and interposed between the lateral edges in the disc-radial direction of adjacent parallel guide groove tracks. Each prepit has a width which width is a narrower dimension than the width of each guide groove track as measured in the disc-radial direction.

摘要翻译： 光存储盘介质包含多个导槽轨道。 引导槽轨道彼此平行地布置，并且它们用于控制光束的位置。 在导向槽轨道之间具有比在径向方向上测量的引导槽轨道的宽度宽的区域。 提供了用于提供导槽轨道的地址信息的准备。 在凹槽区域上形成预凹坑，并且在相邻的平行引导槽轨道的盘径方向上插入横向边缘之间。 每个预凹坑具有宽度，该宽度比在径向方向上测量的每个引导槽轨道的宽度更窄。

公开(公告)号：US06122233A

公开(公告)日：2000-09-19

申请号：US15011

申请日：1998-01-28

申请人： Naoyasu Iketani ,  Go Mori ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

发明人： Naoyasu Iketani ,  Go Mori ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

IPC分类号： G11B7/24 ,  G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B11/105 ,  G11B7/09

CPC分类号： G11B7/00745 ,  G11B11/10563 ,  G11B11/10565 ,  G11B7/00718

摘要： In an optical disk, grooves and lands serving as recording tracks are provided, the grooves are shaped so as to have virtually the same width, and in a first region, the two side walls of each groove wind in accordance with address information. The first region of the groove is formed with its leading portion located at the same angular position as the leading portion of at least one of the first regions of the adjacent grooves. Moreover, the winding portions corresponding to respective bits of the address information are formed in a manner so as to synchronize to the adjacent grooves. With this arrangement, it becomes possible to easily detect address information from the grooves and lands, and consequently to obtain an information reproducing signal with high quality.

摘要翻译： 在光盘中，设置有用作记录轨迹的凹槽和凹槽，这些凹槽成形为具有实质上相同的宽度，并且在第一区域中，每个凹槽的两个侧壁根据地址信息而变风。 凹槽的第一区域形成有其前端部分位于与相邻凹槽的第一区域中的至少一个的前端部分相同的角位置。 此外，与地址信息的各个位对应的绕组部分以与相邻槽同步的方式形成。 利用这种布置，可以容易地从凹槽和平台检测地址信息，从而获得高质量的信息再现信号。

公开(公告)号：US5822282A

公开(公告)日：1998-10-13

申请号：US779774

申请日：1997-01-07

申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

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

CPC分类号： G11B11/10586 ,  G11B11/10521 ,  G11B11/10506

摘要： A magneto-optical recording medium has at least a substrate, a first magnetic layer, a second magnetic layer, and a first interface layer provided between the first and second magnetic layers. The first magnetic layer exhibits a perpendicular magnetic anisotropy from room temperature to a Curie temperature thereof. The second magnetic layer has a coercive force lower than A: that of the first magnetic layer at room temperature, has a Curie temperature higher than that of the first magnetic layer, and exhibits a perpendicular magnetic anisotropy from room temperature to a Curie temperature of the second magnetic layer. The first interface layer is made of at least one rare-earth metal and has a thickness of several atoms. With this arrangement, it is possible (1) to carry out light modulation overwriting with respect to the magneto-optical recording medium, (2) to carry out initialization without an initializing magnetic field, and (3) to stabilize recording bits.

摘要翻译： 磁光记录介质至少具有衬底，第一磁性层，第二磁性层和设置在第一和第二磁性层之间的第一界面层。 第一磁性层表现出从室温到其居里温度的垂直磁各向异性。 第二磁性层具有低于A的矫顽力：室温下的第一磁性层的矫顽力的居里温度高于第一磁性层的居里温度，并呈现出从室温到居里温度的垂直磁各向异性 第二磁性层。 第一界面层由至少一种稀土金属制成，具有几个原子的厚度。 通过这种布置，可以（1）对磁光记录介质进行光调制重写，（2）在不进行初始化磁场的情况下进行初始化，以及（3）稳定记录位。

公开(公告)号：US5787056A

公开(公告)日：1998-07-28

申请号：US766015

申请日：1996-12-13

申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

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

公开(公告)号：US5666332A

公开(公告)日：1997-09-09

申请号：US652810

申请日：1996-05-23

申请人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

发明人： Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi

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

CPC分类号： G11B11/10521 ,  G11B11/10586 ,  G11B11/10506

摘要： A magneto-optical recording medium with a first, second, and third magnetic layers which are laminated on a substrate. The first magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The second magnetic layer has an in-plane magnetization at room temperature, and has a perpendicular magnetization at or above a temperature falling within a range between room temperature and its Curie temperature. The third magnetic layer has an in-plane magnetization at room temperature, and has a perpendicular magnetization at or above a temperature falling within a range between room temperature and the temperature at which a transition occurs in the second magnetic layer from the in-plane magnetization to the perpendicular magnetization. Accordingly, since the second and third magnetic layers have the in-plane magnetization at room temperature, it is possible to previously direct the magnetization of the third magnetic layer in a single specific direction by the induction of an initializing magnetic field during a rise in temperature caused by a laser beam projection. Therefore, the initializing magnetic field can be set smaller than a recording magnetic field. As a result, it is possible to reduce the size of a recording device.

摘要翻译： 一种磁光记录介质，其具有层叠在基板上的第一，第二和第三磁性层。 第一磁性层在室温和居里温度之间的温度范围内具有垂直磁化强度。 第二磁性层在室温下具有平面内的磁化强度，并且具有等于或高于室温和其居里温度之间的范围内的垂直磁化强度。 第三磁性层在室温下具有平面内的磁化强度，并且具有等于或高于室温至第二磁性层中从平面内磁化发生转变的温度之间的范围内的垂直磁化强度 到垂直磁化。 因此，由于第二和第三磁性层在室温下具有面内磁化，因此可以通过在温度升高期间感应初始化磁场来预先引导第三磁性层的单一特定方向的磁化 由激光束投影引起。 因此，初始化磁场可以设定为小于记录磁场。 结果，可以减小记录装置的尺寸。

公开(公告)号：US5640374A

公开(公告)日：1997-06-17

申请号：US659391

申请日：1996-06-06

申请人： Junji Hirokane ,  Michinobu Mieda ,  Junichiro Nakayama ,  Akira Takahashi

发明人： Junji Hirokane ,  Michinobu Mieda ,  Junichiro Nakayama ,  Akira Takahashi

IPC分类号： G11B11/10 ,  G11B7/013 ,  G11B11/105 ,  G11B20/10 ,  G11B11/00

CPC分类号： G11B20/10009 ,  G11B11/10515 ,  G11B11/10584 ,  G11B11/10586 ,  G11B7/24085

摘要： A recording layer having a recording magnetic domain for recording thereon information is formed. A readout layer for reading the information by the application of a light beam is formed on the recording layer. An intermediate layer made of a film having in-plane magnetization is formed between the recording layer and readout layer to control a magnetic exchange coupling force between the recording layer and readout layer. The readout layer is arranged so that the stable magnetic domain width in the readout layer is larger than that of the recording magnetic domain in the recording layer at room temperature. At a readout temperature achieved by the light beam, the stable magnetic domain width becomes smaller than that of the recording magnetic domain, and the magnetization direction in the recording magnetic domain is copied. Consequently, the information on the recording layer is read only from a section corresponding to a central portion of the light beam through the readout layer by the light beam, and the effect of other magnetic domains adjacent to the magnetic domain to be read in the readout layer can be reduced. It is thus possible to achieve high density recording of information on the recording layer.

摘要翻译： 形成具有用于在其上记录信息的记录磁畴的记录层。 在记录层上形成用于通过施加光束读取信息的读出层。 在记录层和读出层之间形成由具有面内磁化强度的膜构成的中间层，以控制记录层和读出层之间的磁交换耦合力。 读出层被布置成使得读出层中的稳定的磁畴宽度大于在室温下在记录层中的记录磁畴的稳定的磁畴宽度。 在由光束获得的读出温度下，稳定的磁畴宽度变得小于记录磁畴的磁畴宽度，并且记录磁畴中的磁化方向被复制。 因此，记录层上的信息仅从对应于通过光束的读出层的光束的中心部分的部分读取，并且与磁畴相邻的其它磁畴的影响将被读取到读出 层可以减少。 因此，可以在记录层上实现信息的高密度记录。

公开(公告)号：US06272077B1

公开(公告)日：2001-08-07

申请号：US09479256

申请日：2000-01-07

申请人： Akira Takahashi ,  Michinobu Mieda ,  Naoyasu Iketani ,  Go Mori ,  Junsaku Nakajima ,  Yoshiteru Murakami ,  Junji Hirokane

发明人： Akira Takahashi ,  Michinobu Mieda ,  Naoyasu Iketani ,  Go Mori ,  Junsaku Nakajima ,  Yoshiteru Murakami ,  Junji Hirokane

IPC分类号： G11B1110

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

摘要： A magneto-optical memory medium according to the present invention comprises a reproducing layer, which has in-plane magnetization at room temperature and perpendicular magnetization when heated to above a predetermined temperature by a reproducing light beam; a recording layer, which is magnetostatically coupled to the reproducing layer; and an in-plane magnetized layer, provided adjacent to the recording layer, which has a Curie temperature at the above-mentioned predetermined temperature. In this medium, at temperatures below the predetermined temperature, signals recorded at high density in the recording layer are masked, and the above-mentioned magnetostatic coupling is suppressed, by magnetic masking by the in-plane magnetized layer. At temperatures above the predetermined temperature, however, within a domain forming part of the in-plane magnetized layer, the recording layer and the reproducing layer are magnetostatically coupled, and a recording bit of the recording layer is copied and expanded to a magnetic domain in the reproducing layer. Accordingly, with this medium, by reproducing from an expanded magnetic domain of the reproducing layer, even information from recording bits recorded at high density can be reproduced with high signal quality.

摘要翻译： 根据本发明的磁光存储介质包括再现层，其在室温下具有面内磁化并且通过再现光束被加热到高于预定温度时的垂直磁化; 记录层，其被静磁耦合到再现层; 以及与记录层相邻的面内磁化层，居里温度在上述预定温度。 在该介质中，在低于预定温度的温度下，记录层中以高密度记录的信号被屏蔽，并且通过面内磁化层的磁屏蔽来抑制上述静磁耦合。 然而，在高于预定温度的温度下，在形成面内磁化层的一部分的区域内，磁静电耦合记录层和再现层，并且将记录层的记录位复制并扩展到磁畴中 再现层。 因此，利用该介质，通过从再现层的扩展磁畴再现，可以以高信号质量再现以高密度记录的记录位的信息。