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31. 发明授权

US5825723A Magneto-optical recording medium having a reproducing layer with different magnetization directions in different temperature ranges 失效
标题翻译：具有在不同温度范围内具有不同磁化方向的再现层的磁光记录介质
公开(公告)号：US5825723A
公开(公告)日：1998-10-20
申请号：US685534
申请日：1996-07-24
申请人： Junji Hirokane , Junichiro Nakayama , Akira Takahashi
发明人： Junji Hirokane , Junichiro Nakayama , Akira Takahashi
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10586
摘要： A non-magnetic intermediate layer for intercepting magnetic exchange interaction is provided between a recording layer and a reproducing layer which are composed of a magnetic thin film with perpendicular magnetization. At this time, the reproducing layer is formed so that when an external magnetic field is applied thereto in reproducing information, its magnetization direction is arranged in the direction of the external magnetic field in a first temperature range, and when a light beam for reproduction is projected thereto and the reproducing layer is in a second temperature, the magnetization direction is arranged in the direction of a leakage magnetic flux generated from the recording layer, and is again arranged in the direction of the external magnetic field in a third temperature range. As a result, a rise and a fall of a reproducing signal detected from the reproducing layer can be made sharp, thereby achieving recording and reproducing at high density.
摘要翻译：在由具有垂直磁化的磁性薄膜组成的记录层和再现层之间提供用于截取磁交换相互作用的非磁性中间层。此时，再现层形成为当再现信息中施加外部磁场时，其磁化方向在第一温度范围内沿外部磁场的方向排列，并且当用于再现的光束为投影到其上并且再现层处于第二温度，磁化方向被布置在从记录层产生的泄漏磁通的方向上，并且在第三温度范围内再次设置在外部磁场的方向上。结果，可以使从再现层检测到的再现信号的上升和下降变得尖锐，从而实现高密度的记录和再现。

32. 发明授权

US5768218A Magneto-optical recording medium having a plurality of magnetic layers 失效
标题翻译：具有多个磁性层的磁光记录介质
公开(公告)号：US5768218A
公开(公告)日：1998-06-16
申请号：US803274
申请日：1997-02-20
申请人： Junichiro Nakayama , Yoshiteru Murakami , Junji Hirokane , Akira Takahashi
发明人： Junichiro Nakayama , Yoshiteru Murakami , Junji Hirokane , Akira Takahashi
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10584 , G11B11/10586 , G11B11/10506 , G11B11/10515 , G11B11/10521
摘要： A magneto-optical recording medium has a transparent substrate, a first magnetic layer, first intermediate layer, a second magnetic layer, and a third magnetic layer provided in this order. The first magnetic layer has an in-plane magnetization at room temperature, while a transition from the in-plane magnetization to a perpendicular magnetization occurs to the first magnetic layer with a temperature rise. The first intermediate layer is made of a non-magnetic substance. The second magnetic layer is a film having a perpendicular magnetization. The third magnetic layer is a film having a perpendicular magnetization, has a coercive force smaller than that of the second magnetic layer at room temperature, and has a Curie temperature higher than that of the second magnetic layer. The light intensity modulation overwriting method is applicable to the magneto-optical recording medium thus arranged, superior reproduction signal characteristics can be obtained with respect to this magneto-optical recording medium, and reproduction can be carried out with respect to the recording medium even though it has recording bits whose each diameter is smaller than that of a light beam. Thus it is possible to provide the magneto-optical recording medium suitable for high density recording.
摘要翻译：磁光记录介质具有依次设置的透明基板，第一磁性层，第一中间层，第二磁性层和第三磁性层。第一磁性层在室温下具有平面内的磁化强度，而从第一磁性层的温度上升发生从面内磁化向垂直磁化的转变。第一中间层由非磁性物质制成。第二磁性层是具有垂直磁化强度的膜。第三磁性层是具有垂直磁化的膜，在室温下的矫顽力小于第二磁性层的矫顽力，并且居里温度高于第二磁性层的居里温度。光强度调制重写方法适用于如此布置的磁光记录介质，可以获得相对于该磁光记录介质的优良再现信号特性，并且可以相对于记录介质进行再现，即使它具有每个直径小于光束直径的记录位。因此，可以提供适合于高密度记录的磁光记录介质。

33. 发明授权

US06665235B2 Magneto-optical recording medium and recording and reproducing method and optical head designed for the magneto-optical recording medium 失效
标题翻译：磁光记录介质以及用于磁光记录介质的记录和再现方法和光头
公开(公告)号：US06665235B2
公开(公告)日：2003-12-16
申请号：US10214881
申请日：2002-08-08
申请人： Yoshiteru Murakami , Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta , Naoyasu Iketani
发明人： Yoshiteru Murakami , Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta , Naoyasu Iketani
IPC分类号： G11B1100
CPC分类号： G11B11/10586 , B60T1/005 , F16D63/00 , G11B7/00718 , G11B7/126 , G11B11/10506 , G11B11/10515 , G11B11/10517 , G11B11/10543 , G11B11/10595
摘要： Featured is a recording and reproducing method of a magneto-optical recording medium including a recording layer for recording thereon information magneto-optically and a readout layer which has in-plane magnetization at room temperature and where a transition occurs from in-plane magnetization to perpendicular magnetization as temperature raises. The method includes projecting a light beam onto such a magneto-optical recording medium so as to form a perpendicularly magnetized area in the readout layer by duplication of the magnetization of said recording layer to the area. In further embodiments, the recording medium further includes an intermediate layer made of non-magnetic film formed between the readout and recording layers and the readout and recording layers are composed of rare-earth transition metal alloys such as TbFeCo (recoding layer) readout layer, made of GdFeCo (readout layer).
摘要翻译：特别是磁光记录介质的记录和再现方法，其包括用于在其上记录磁光信息的记录层和在室温下具有面内磁化的读出层，并且其中从面内磁化转变为垂直磁化随温度升高。该方法包括将光束投影到这种磁光记录介质上，以便通过将所述记录层的磁化复制到该区域而在读出层中形成垂直磁化区域。在另外的实施例中，记录介质还包括由读出和记录层之间形成的非磁性膜制成的中间层，并且读出和记录层由稀土过渡金属合金如TbFeCo（记录层）读出层，由GdFeCo（读出层）制成。

34. 发明授权

US06483785B1 Magneto-optical recording method using the relation of beam diameter and an aperture of converging lens 失效
标题翻译：使用光束直径与会聚透镜孔径的磁光记录方法
公开(公告)号：US06483785B1
公开(公告)日：2002-11-19
申请号：US09685829
申请日：2000-10-10
申请人： Yoshiteru Murakami , Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta , Naoyasu Iketani
发明人： Yoshiteru Murakami , Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta , Naoyasu Iketani
IPC分类号： G11B1100
CPC分类号： G11B7/126 , G11B7/00718 , G11B11/10506 , G11B11/10515 , G11B11/10517 , G11B11/10543 , G11B11/10584 , G11B11/10586 , G11B11/10595 , Y10S428/90
摘要： Featured is a recording and reproducing method for recording and reproducing information on and from a recording medium. The medium includes a base having a property that a light can be transmitted therethrough, a readout layer formed on the base, which has an in-plane magnetization at room temperature, whereas, a transition occurs from in-plane magnetization to perpendicular magnetization as temperature rises and a recording layer formed on said readout layer for recording thereon information magneto-optically. A groove for guiding a light beam is formed on a readout layer side of the base and a groove width is set substantially equal to a land width formed between grooves. The recording layer on the grooves and the recording layer on lands are used in recording and reproducing information. Further a light beam is incident on a converging lens of an optical head, the light beam having a larger diameter &ohgr; than an aperture &agr; of the converging lens for converging the light beam on a predetermined position of the magneto-optical recording medium.
摘要翻译：特色是用于在记录介质上记录和再现信息的记录和再现方法。该介质包括具有光可以透射的性质的基底，形成在基底上的读出层，其在室温下具有面内磁化强度，而从平面内磁化转变为垂直磁化转变为温度并且在所述读出层上形成用于在其上记录光学信息的记录层。在基板的读出层侧形成用于引导光束的槽，并且将槽宽度设定为与槽之间形成的焊盘宽度大致相等。凹槽上的记录层和焊盘上的记录层用于记录和再现信息。此外，光束入射到光学头的会聚透镜上，所述光束具有比会聚透镜的孔径α更大的直径Ω，用于将光束会聚在磁光记录介质的预定位置。

35. 发明授权

US5428585A Magneto-optical recording medium comprising first, second and third magnetic layers and method of recording on same 失效
标题翻译：包括第一，第二和第三磁性层的磁光记录介质及其记录方法
公开(公告)号：US5428585A
公开(公告)日：1995-06-27
申请号：US102349
申请日：1993-08-05
申请人： Junji Hirokane , Hiroyuki Katayama , Junichiro Nakayama , Akira Takahashi , Kenji Ohta
发明人： Junji Hirokane , Hiroyuki Katayama , Junichiro Nakayama , Akira Takahashi , Kenji Ohta
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10586 , G11B11/10515 , G11B11/10521
摘要： A magneto-optical recording medium has (1) a first magnetic layer made of a magnetic material which is changed into a vertical magnetization film in response to a temperature rise while is an in-plane magnetization film at a room temperature; (2) a second magnetic layer made of a vertical magnetization film; and (3) a third magnetic layer made of a vertical magnetic film having a higher Curie temperature than that of the second magnetic layer; and (4) a base substrate on which the first, second, and third magnetic layers are luminated in this order. With the arrangement, the optically modulated overwriting can be carried out with respect to the second magnetic layer and it is not necessary to complete the magnetization direction to one direction for each optically modulated overwriting. Moreover, it is possible to reproduce through the first magnetic layer the information which is recorded on a smaller portion than a light beam spot.
摘要翻译：磁光记录介质具有：（1）由磁性材料制成的第一磁性层，其响应于温度而变成垂直磁化膜，而在室温下为面内磁化膜; （2）由垂直磁化膜制成的第二磁性层; 和（3）由具有比第二磁性层的居里温度更高的居里温度的垂直磁性膜制成的第三磁性层; 和（4）基底基板，其上依次发光第一，第二和第三磁性层。通过该配置，可以相对于第二磁性层执行光调制重写，并且对于每个光调制重写，不需要向一个方向完成磁化方向。此外，可以通过第一磁性层再现记录在比光束点更小的部分上的信息。

36. 发明授权

US06261707B1 Magneto-optical recording medium and recording and reproducing method and optical head designed for the magneto-optical recording medium 失效
标题翻译：磁光记录介质以及用于磁光记录介质的记录和再现方法和光头
公开(公告)号：US06261707B1
公开(公告)日：2001-07-17
申请号：US08147373
申请日：1993-11-03
申请人： Yoshiteru Murakami , Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta , Naoyasu Iketani
发明人： Yoshiteru Murakami , Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta , Naoyasu Iketani
IPC分类号： G11B566
CPC分类号： G11B7/126 , G11B7/00718 , G11B11/10506 , G11B11/10515 , G11B11/10517 , G11B11/10543 , G11B11/10584 , G11B11/10586 , G11B11/10595 , Y10S428/90
摘要： A magneto-optical recording medium is composed of a base which has a property that a light can be transmitted therethrough, a readout layer formed on the base, which has in-plane magnetization at room temperature, whereas, a transition occurs from in-plane magnetization to perpendicular magnetization as the temperature thereof is raised and a recording layer formed on the readout layer for recording information magneto-optically. A recording and reproducing method and the optical head are designed for the magneto-optical recording medium. By the recording and reproducing method using the optical head, information recorded at high density can be reproduced.
摘要翻译：磁光记录介质由具有光透射性的基底组成，形成在基底上的读出层，其在室温下具有面内磁化，而从平面内发生转变随着其温度升高，磁化至垂直磁化，以及形成在读出层上用于磁光记录信息的记录层。记录和再现方法和光学头被设计用于磁光记录介质。通过使用光学头的记录和再现方法，可以再现以高密度记录的信息。

37. 发明授权

US6042954A Magneto-optical recording medium 失效
标题翻译：磁光记录介质
公开(公告)号：US6042954A
公开(公告)日：2000-03-28
申请号：US844270
申请日：1997-04-18
申请人： Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi
发明人： Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi
IPC分类号： G11B11/10 , G11B11/105 , G11B5/66
CPC分类号： G11B11/10586 , Y10S428/90
摘要： An magneto-optical recording medium includes: a transparent dielectric layer; a reproduction layer that is in an in-plane magnetization state at room temperature and changes into a perpendicular magnetization state with a rise in temperature; a non-magnetic intermediate layer; a recording layer made of a perpendicularly magnetized film; and a protection layer, the layers being formed one after another in this order. The recording layer is made of a rare-earth and transition metal alloy, and the rare earth metal is composed of more than two kinds of rare-earth-metal elements containing Gd. The information stored in a magnetic recording domain is masked with respect to a part that is in an in-plane magnetization state. Consequently, recording can be performed with a less powerful laser beam, and each recording bit can be reproduced independently to produce high quality signals even if the converged light beam covers a neighboring recording bit within its radius.
摘要翻译：磁光记录介质包括：透明介质层; 在室温下处于面内磁化状态并随着温度升高而变成垂直磁化状态的再生层; 非磁性中间层; 由垂直磁化膜制成的记录层; 和保护层，这些层依次依次形成。记录层由稀土和过渡金属合金制成，稀土金属由含有Gd的两种以上的稀土金属元素组成。存储在磁记录领域中的信息相对于处于平面内磁化状态的部分被掩蔽。因此，可以用较不强大的激光束执行记录，并且即使会聚光束覆盖其半径内的相邻记录位，也可以独立地再现每个记录位以产生高质量信号。

38. 发明授权

US5939187A Magneto-optical recording medium 失效
标题翻译：磁光记录介质
公开(公告)号：US5939187A
公开(公告)日：1999-08-17
申请号：US859614
申请日：1997-05-20
申请人： Junji Hirokane , Junichiro Nakayama , Akira Takahashi
发明人： Junji Hirokane , Junichiro Nakayama , Akira Takahashi
IPC分类号： G11B11/10 , G11B11/105 , G11B5/66
CPC分类号： G11B11/10586 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： A magneto-optical recording medium includes a reproducing layer which has in-plane magnetization at room temperature and has perpendicular magnetization at an elevated temperature of not less than a critical temperature, a recording layer made of a perpendicular magnetization film for recording information, an intermediate layer made of a non-magnetic film formed between the reproducing layer and the recording layer, and an in-plane magnetization layer adjacent to the reproducing layer, in which magnetization is reduced at a temperature in a vicinity of the critical temperature. According to the described magneto-optical recording medium, since information recorded in a recording magnetic domain of a portion having the in-plane magnetization is masked, even in the case where adjacent recording bits fall within a diameter of a spot of a converged light beam, each recording bit can be reproduced separately, thereby obtaining a quality reproduced signal.
摘要翻译：磁光记录介质包括在室温下具有面内磁化并且在不低于临界温度的升高的温度下具有垂直磁化的再现层，由用于记录信息的垂直磁化膜制成的记录层，中间层由形成在再现层和记录层之间的非磁性膜制成的层以及与再现层相邻的面内磁化层，其中磁化在临界温度附近的温度下降低。根据所述的磁光记录介质，由于记录在具有面内磁化的部分的记录磁畴中的信息被掩蔽，所以即使在相邻记录位落入会聚光束的光点的直径的情况下，可以分别再现每个记录位，从而获得质量再现信号。

39. 发明授权

US5777953A Arrangement of magneto-optical recording medium which capable of reproducing an individual bit 失效
标题翻译：能够再现单个位的磁光记录介质的布置
公开(公告)号：US5777953A
公开(公告)日：1998-07-07
申请号：US769254
申请日：1996-12-18
申请人： Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta
发明人： Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10515 , G11B11/10584 , G11B11/10589 , G11B11/10593
摘要： A magneto-optical recording medium is arranged so that (1) a first transparent dielectric layer, (2) a reproduction layer showing in-plane magnetization at room temperature while showing perpendicular magnetization in response to temperature rise, (3) a second transparent dielectric layer, (4) a recording layer made of perpendicular magnetization film; and (5) a protective layer are laminated on a substrate in this order. The reproduction layer has a thickness of 5 nm to 30 nm, the second transparent dielectric layer has a thickness of 6 nm to 40 nm, and the recording layer has a thickness of 20 nm to 80 nm. It is possible to separately reproduce individual recording bit even when one or more adjacent recording bits exist within the diameter of the light beam converged onto a target recording bit. This is because the information of a recording magnetic domain of a portion showing in-plane magnetization is masked.
摘要翻译：磁光记录介质被布置成使得（1）第一透明介电层，（2）再现层，其在室温下显示面内磁化同时响应于温度升高而显示垂直磁化强度，（3）第二透明电介质层，（4）由垂直磁化膜制成的记录层; 和（5）保护层依次层压在基板上。再生层的厚度为5nm〜30nm，第二透明电介质层的厚度为6nm〜40nm，记录层的厚度为20nm〜80nm。即使在收敛到目标记录位上的光束的直径内存在一个或多个相邻记录位，也可以分别再现单个记录位。这是因为屏蔽显示面内磁化的部分的记录磁畴的信息。

40. 发明授权

US5422865A Light modulation method for magneto-optical recording device 失效
标题翻译：磁光记录装置的光调制方法
公开(公告)号：US5422865A
公开(公告)日：1995-06-06
申请号：US163355
申请日：1993-12-07
申请人： Hiroyuki Katayama , Junji Hirokane , Junichiro Nakayama , Akira Takahashi , Kenji Ohta
发明人： Hiroyuki Katayama , Junji Hirokane , Junichiro Nakayama , Akira Takahashi , Kenji Ohta
IPC分类号： G11B11/10 , G11B11/105 , G11B13/04
CPC分类号： G11B11/10506 , G11B11/10521
摘要： A magneto-optical recording method includes the steps of applying an external magnetic field perpendicularly onto the magnetic thin film with perpendicular magnetization of a magneto-optical recording medium and projecting a light beam onto the magneto-optical recording medium; and modulating the intensity of the light beam between the first light intensity and the second light intensity in response to the information to be recorded while shifting a spot of the light beam, thereby recording information. In the above method, the first light intensity is set such that by reducing the coercive force of the magnetic thin film with perpendicular magnetization, a magnetic domain is formed on the magnetic thin film with perpendicular magnetization, and that the magnetic domain is moved as the spot of the light beam is shifted. The second light intensity is set such that by increasing the coercive force of the magnetic thin film with perpendicular magnetization, the magnetic domain is fixed to the position.
摘要翻译：磁光记录方法包括以下步骤：利用磁光记录介质的垂直磁化将磁场垂直地施加到磁性薄膜上并将光束投射到磁光记录介质上; 以及响应于要移动光束的点而要记录的信息，调制第一光强度和第二光强度之间的光束的强度，从而记录信息。在上述方法中，第一光强度被设定为通过以垂直磁化强度降低磁性薄膜的矫顽力，在磁性薄膜上以垂直磁化形成磁畴，并且磁畴作为光束的光斑被移动。第二光强度被设定为通过以垂直磁化强度增加磁性薄膜的矫顽力，将磁畴固定在该位置上。

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