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71. 发明授权

US5486395A Magneto-optical disk 失效
标题翻译：磁光盘
公开(公告)号：US5486395A
公开(公告)日：1996-01-23
申请号：US984350
申请日：1992-12-02
申请人： Yoshiteru Murakami , Naoyasu Iketani , Akira Takahashi , Kenji Ohta
发明人： Yoshiteru Murakami , Naoyasu Iketani , Akira Takahashi , Kenji Ohta
IPC分类号： G11B11/10 , G11B11/105 , B32B3/02 , G11B5/66
CPC分类号： G11B11/10504 , G11B11/10515 , G11B11/10582 , G11B11/10586 , Y10S428/90
摘要： A magneto optical disk comprising: a circular substrate; a recording layer, formed on the substrate, for magneto-optical recording of information; a readout layer, formed between the substrate and the recording layer, for the reproduction of information recorded on the recording layer, wherein the readout layer has a Curie temperature which is higher than the Curie temperature of the recording layer, and exhibits in-plane magnetization at room temperature and a change from in-plane magnetization to perpendicular magnetization when its temperature rises over a certain temperature as a result of the application of a light beam, and wherein the magnetic compensation temperature is set such that it increases from the peripheral edge of the magneto-optical disk toward the center thereof. When the magneto-optical disk is used with a magneto-optical recording and reproducing device using a CAV system, it achieves high-density recording and the reproduction of signals with reduced noise, without causing the light beam control system to be complicated.
摘要翻译：一种磁光盘，包括：圆形衬底; 记录层，形成在基板上，用于磁光记录信息; 形成在基板和记录层之间的用于再现记录在记录层上的信息的读出层，其中读出层的居里温度高于记录层的居里温度，并且表现出面内磁化在室温下由于施加光束而在其温度上升超过一定温度时从面内磁化变化到垂直磁化的变化，并且其中磁补偿温度被设定为使得其从外周边缘磁光盘朝向其中心。当磁光盘与使用CAV系统的磁光记录和再现装置一起使用时，可以实现高密度记录和降低噪声的信号的再现，而不会使光束控制系统复杂化。

72. 发明授权

US5922177A Magneto-optical recording medium and producing method thereof 失效
标题翻译：磁光记录介质及其制造方法
公开(公告)号：US5922177A
公开(公告)日：1999-07-13
申请号：US112930
申请日：1998-07-09
申请人： Naoyasu Iketani , Yoshiteru Murakami , Akira Takahashi , Kenji Ohta
发明人： Naoyasu Iketani , Yoshiteru Murakami , Akira Takahashi , Kenji Ohta
IPC分类号： C23C14/18 , C23C14/34 , G11B7/26 , G11B11/105 , C23C14/00 , C23C14/32
CPC分类号： C23C14/3407 , C23C14/185 , G11B11/10582 , G11B11/10586 , G11B7/26
摘要： A method to produce a magneto-optical recording medium which includes a readout layer having in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to a perpendicular magnetization when temperature rises, and a recording layer for storing information thereon magneto-optically. In the readout layer made of GdFeCo by adding Nd thereto, an amount of Nd to be added changes in a direction perpendicular to its film surface, and an amount of Nd is larger on a light incidence side than on the other side. As a result, even when a laser with a short wavelength is used, high density recording can be achieved as undesirable recording and reproducing operations due to a change in a magnetic interaction is prevented and also deterioration in quality of a reproducing signal is prevented.
摘要翻译：一种制造磁光记录介质的方法，其包括在室温下具有面内磁化的读出层，并且其中当温度升高时从面内磁化转变为垂直磁化，并且在其上存储信息的记录层磁光学。在通过添加Nd而由GdFeCo制成的读出层中，要添加的Nd的量在垂直于其膜表面的方向上变化，并且Nd的量在光入射侧比在另一侧更大。结果，即使使用具有短波长的激光器，由于防止了磁相互作用的变化而导致由于不期望的记录和再现操作而导致高密度记录，并且也防止再现信号的质量劣化。

73. 发明授权

US5331612A Magneto-optical recording apparatus using the magnetic field modulation method 失效
标题翻译：使用磁场调制方法的磁光记录装置
公开(公告)号：US5331612A
公开(公告)日：1994-07-19
申请号：US922854
申请日：1992-07-31
申请人： Yoshiteru Murakami , Kenji Ohta , Akira Takahashi
发明人： Yoshiteru Murakami , Kenji Ohta , Akira Takahashi
IPC分类号： G11B5/02 , G11B11/10 , G11B11/105 , G11B13/04
CPC分类号： G11B11/10521 , G11B11/10508 , G11B11/1051 , G11B11/10528 , G11B11/1053 , G11B11/10595
摘要： A magneto-optical recording apparatus which records information through the processes of: first irradiating a light beam onto a magneto-optical recording medium having a recording film; and next applying an external magnetic field that is inverted in response to a recording signal onto the recording film while continuing the first process. In the above arrangement, the intensity of the light beam is dropped upon inversion of the external magnetic field so that information is not recorded. The intensity of the light beam is raised during non-inversion of the external magnetic field so that information is recorded. Further the magneto-optical recording apparatus is provided with a light intensity control device for varying the intensity of the light beam dependent of the lengths of recording bits so that the high-temperature area of the recording film is not widened. Since the width of the recording bits is uniformly maintained, the remaining of the recording bit after overwriting operation can be reduced; thus, the signal quality in reproduction can be enhanced.
摘要翻译：一种磁光记录装置，其通过以下处理记录信息：首先将光束照射到具有记录膜的磁光记录介质上; 并且接着在继续进行第一处理的同时将响应于记录信号反转的外部磁场施加到记录膜上。在上述布置中，光束的强度在外部磁场反转时下降，从而不记录信息。在外部磁场的非反相期间，光束的强度升高，从而记录信息。此外，磁光记录装置设置有光强度控制装置，用于根据记录位的长度改变光束的强度，使得记录膜的高温区域不会变宽。由于记录位的宽度被均匀地保持，所以可以减少重写操作之后的记录位的剩余部分。因此，可以提高再现中的信号质量。

74. 发明授权

US5317555A Optical head device utilizing partially overlapping light spots to read information from a readout layer 失效
标题翻译：使用部分重叠的光点从读出层读取信息的光学头装置
公开(公告)号：US5317555A
公开(公告)日：1994-05-31
申请号：US910837
申请日：1992-07-08
申请人： Akira Takahashi , Yoshiteru Murakami , Junsaku Nakajima , Kenji Ohta
发明人： Akira Takahashi , Yoshiteru Murakami , Junsaku Nakajima , Kenji Ohta
IPC分类号： G11B11/10 , G11B11/105 , G11B13/04
CPC分类号： G11B11/10545 , G11B11/10515
摘要： A magneto-optical disk has a recording layer whereon recorded bits are formed by the magnetic field modulation method and a readout layer whose axis of easy magnetization is parallel to the recording layer at room temperature, and varies to be perpendicular to the recording layer within a predetermined temperature range between room temperature and the Curie temperature. During reproduction of the recorded bits the first semiconductor laser emits a heating-use light beam to form the first light spot on the readout layer Thus, a ring-shaped region corresponding to the predetermined temperature range exhibits perpendicular magnetic anisotropy and the recorded bits are copied from the recording layer onto the ring-shaped region. As the first light spot is shifted, the ring-shaped region as a readout window of recorded bits is also shifted. Further, the second semiconductor laser emits a reproduction-use light beam such that the second light spot is formed on the readout layer to overlap the first light spot at a rear portion thereof. Consequently, only one recorded bit copied onto the rear portion of the ring-shaped region can be reproduced; therefore, high-quality reproduced signals can be obtained from the magneto-optical disk having information recorded with high density.
摘要翻译：磁光盘具有通过磁场调制方法形成记录位的记录层和容易磁化的轴在室温下与记录层平行的读出层，并且在其内变化为垂直于记录层室温和居里温度之间的预定温度范围。在再现记录位期间，第一半导体激光器发出加热用光束，以在读出层上形成第一光点。因此，对应于预定温度范围的环形区域呈现垂直的磁各向异性，并且记录的位被复制从记录层到环形区域。当第一个光点移动时，作为记录位的读出窗口的环形区域也被移位。此外，第二半导体激光器发射再现用光束，使得第二光点形成在读出层上，以在其后部与第一光点重叠。因此，只能再现复制到环形区域后部的一个记录位; 因此，可以从具有以高密度记录的信息的磁光盘获得高质量的再现信号。

75. 发明授权

US5305300A Magneto optical storage device using a multi-layer film of Pt/Co laminated sections 失效
标题翻译：磁光存储器件采用Pt / Co层叠多层薄膜
公开(公告)号：US5305300A
公开(公告)日：1994-04-19
申请号：US888548
申请日：1992-05-22
申请人： Kenji Ohta , Akira Takahashi , Junsaku Nakajima , Yoshiteru Murakami
发明人： Kenji Ohta , Akira Takahashi , Junsaku Nakajima , Yoshiteru Murakami
IPC分类号： G11B11/105 , G11B7/24
CPC分类号： G11B11/10582 , G11B11/10593 , Y10S428/90
摘要： A magneto-optical storage device having a configuration wherein a first AlN film, a Pt/co multi-layer film formed by alternately depositing Pt and Co, a second AlN film, and an Al reflective film are successively laminated on a substrate in this order. Assuming that respectively the thickness of the first AlN film is .delta.AlN (1); that of the second AlN film is .delta.AlN (2); that of the Pt single layer is .delta.Pt; that of the Co single layer is .delta.Co; and the total thickness of the Pt/Co multi-layer film is .delta.Pt/Co, each thickness of those layers is set to range within: 50 nm .ltoreq..delta.AlN (1).ltoreq.200 nm; 120 nm.ltoreq..delta.AlN (2).ltoreq.140 nm; 0.6 nm.ltoreq..delta.Pt.ltoreq.1.0 nm; 0.3 nm.ltoreq..delta.Co.ltoreq.0.6 nm; and 15 nm.ltoreq..delta.Pt/Co.ltoreq.20 nm. In accordance with the above arrangement, it is possible to greatly widen the tolerances of the film thicknesses of the first and second dielectric layers for obtaining a predetermined reflective index as well as a maximum Kerr rotation angle. Consequently, without strictly controlling the film thicknesses of the first and second AlN films, a magneto-optical storage device with stable performance suitable for practical use can be produced easily.
摘要翻译：具有这样一种结构的磁光存储装置，其中第一AlN膜，通过交替沉积Pt和Co形成的Pt / co多层膜，第二AlN膜和Al反射膜依次层叠在基板上。假设第一AlN膜的厚度分别为（Δ）AlN（1）; 第二AlN膜的厚度为（Δ）AlN（2）; Pt单层为（delta）Pt; Co单层为（delta）Co; 并且Pt / Co多层膜的总厚度为（delta）Pt / Co，这些层的每个厚度设定在：50nm <=（delta）AlN（1）<= 200nm的范围内; 120nm <=（delta）AlN（2）<= 140nm; 0.6nm <=（delta）Pt <= 1.0nm; 0.3nm <=（delta）Co <= 0.6nm; 和15nm <=（delta）Pt / Co <= 20nm。根据上述结构，可以大大拓宽第一和第二介质层的膜厚的公差，以获得预定的反射率以及最大的克尔旋转角。因此，在不严格控制第一和第二AlN膜的膜厚的情况下，可以容易地制造出具有适合于实际应用的稳定性能的磁光存储装置。

76. 发明授权

US4695514A Magneto-optical memory element 失效
标题翻译：磁光存储元件
公开(公告)号：US4695514A
公开(公告)日：1987-09-22
申请号：US675850
申请日：1984-11-28
申请人： Akira Takahashi , Yoshiteru Murakami , Junji Hirokane , Hiroyuki Katayama , Kenji Ohta
发明人： Akira Takahashi , Yoshiteru Murakami , Junji Hirokane , Hiroyuki Katayama , Kenji Ohta
IPC分类号： H01F10/14 , G11B11/10 , G11B11/105 , G11C13/06 , H01F10/12 , H01F10/13 , G11B7/24
CPC分类号： G11B11/10591 , G11B11/10586 , Y10S428/90 , Y10T428/31678
摘要： A magneto-optical memory element includes a glass substrate and an amorphous Nd-Gd-Fe ternary alloy magnetic recording thin-film having an axis of easy magnetization perpendicular to its surface. The magneto-optical memory element shows a preferable coercive force, a high Kerr rotation angle in the reproduced laser beam, and the Curie temperature suited for a stable operation.
摘要翻译：磁光存储元件包括玻璃基板和具有垂直于其表面的易磁化轴的非晶Nd-Gd-Fe三元合金磁记录薄膜。磁光存储元件显示出优选的矫顽力，再现激光束中的高克尔旋转角以及适于稳定操作的居里温度。

77. 发明授权

US4610912A Magneto-optic memory element 失效
标题翻译：磁光存储元件
公开(公告)号：US4610912A
公开(公告)日：1986-09-09
申请号：US648741
申请日：1984-09-10
申请人： Akira Takahashi , Yoshiteru Murakami , Junji Hirokane , Hiroyuki Katayama , Kenji Ohta , Hideyoshi Yamaoka
发明人： Akira Takahashi , Yoshiteru Murakami , Junji Hirokane , Hiroyuki Katayama , Kenji Ohta , Hideyoshi Yamaoka
IPC分类号： G11B11/105 , H01F10/12 , H01F10/14 , G11B7/24
CPC分类号： G11B11/10593 , H01F10/126 , H01F10/14 , Y10S428/90 , Y10T428/2495 , Y10T428/24975
摘要： A magneto-optic memory element includes a transparent substrate, a first transparent nitride film, a GdTbFe recording layer, a second transparent nitride film, and a reflection film formed in this order. The first transparent nitride film has an index of refraction higher than that of the second transparent nitride film. In a preferred form, the first transparent nitride film is a SiN film having the index of refraction of about 2.0, and the second transparent nitride film is an AlN film having the index of refraction of about 1.8 to 1.9.
摘要翻译：磁光存储元件包括透明衬底，第一透明氮化物膜，GdTbFe记录层，第二透明氮化物膜和依次形成的反射膜。第一透明氮化物膜的折射率高于第二透明氮化物膜的折射率。在优选形式中，第一透明氮化物膜是折射率为约2.0的SiN膜，第二透明氮化物膜是折射率为约1.8至1.9的AlN膜。

78. 发明授权

US5824426A Magneto-optical recording medium 失效
标题翻译：磁光记录介质
公开(公告)号：US5824426A
公开(公告)日：1998-10-20
申请号：US535967
申请日：1995-09-28
申请人： Naoyasu Iketani , Yoshiteru Murakami , Akira Takahashi , Kenji Ohta
发明人： Naoyasu Iketani , Yoshiteru Murakami , Akira Takahashi , Kenji Ohta
IPC分类号： C23C14/18 , C23C14/34 , G11B7/26 , G11B11/105 , G11B5/716 , G11B5/66 , G11B11/00
CPC分类号： C23C14/3407 , C23C14/185 , G11B11/10582 , G11B11/10586 , G11B7/26
摘要： A magneto-optical recording medium includes a readout layer having in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to a perpendicular magnetization when temperature rises, and a recording layer for storing information thereon magneto-optically. In the readout layer made of GdFeCo by adding Nd thereto, an amount of Nd to be added changes in a direction perpendicular to its film surface, and an amount of Nd is larger on a light incidence side than on the other side. As a result, even when a laser with a short wavelength is used, high density recording can be achieved as undesirable recording and reproducing operations due to a change in a magnetic interaction is prevented and also deterioration in quality of a reproducing signal is prevented.
摘要翻译：磁光记录介质包括在室温下具有面内磁化的读出层，并且其中当温度升高时从面内磁化转变为垂直磁化的过渡;以及用于在磁光上存储信息的记录层。在通过添加Nd而由GdFeCo制成的读出层中，要添加的Nd的量在垂直于其膜表面的方向上变化，并且Nd的量在光入射侧比在另一侧更大。结果，即使使用具有短波长的激光器，由于防止了磁相互作用的变化而导致由于不期望的记录和再现操作而导致高密度记录，并且也防止再现信号的质量劣化。

79. 发明授权

US5764601A Method of manufacturing a magneto-optical recording medium having a readout layer with varying composition and curie temperature 失效
标题翻译：具有具有不同组成和居里温度的读出层的磁光记录介质的制造方法
公开(公告)号：US5764601A
公开(公告)日：1998-06-09
申请号：US685115
申请日：1996-07-23
申请人： Yoshiteru Murakami , Naoyasu Iketani , Akira Takahashi , Kenji Ohta
发明人： Yoshiteru Murakami , Naoyasu Iketani , Akira Takahashi , Kenji Ohta
IPC分类号： C23C14/18 , C23C14/34 , C23C14/56 , G11B11/105 , G11B11/00 , G11B5/66
CPC分类号： C23C14/3414 , C23C14/185 , C23C14/568 , G11B11/10582 , G11B11/10586 , G11B11/10589
摘要： A magneto-optical recording medium includes a readout layer has in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to perpendicular magnetization when temperature thereof is raised, and a recording layer for recording thereon information. The composition of the readout layer varies in a direction perpendicular to the surface thereof, and in the readout layer, the Co density on the light incident side is higher than the Co density on the interface between the readout layer and the recording layer. Therefore, the Curie temperature on the reproducing light incident side of the readout layer is high and the the polar Kerr rotation angle in reproducing increases, thereby achieving improvements in a reproducing signal quality. On the other hand, since the Curie temperature on the interface is low, the shift of the threshold temperature at which a transition occurs from in-plane to perpendicular by the magnetic interaction between the layers can be suppressed, thereby achieving a high quality reproducing signal without changing the laser power required for reproduction very much.
摘要翻译：磁光记录介质包括读出层，其在室温下具有面内磁化，并且其温度升高时从面内磁化转变为垂直磁化，并且在其上记录信息的记录层。读出层的组成在垂直于其表面的方向上变化，在读出层中，光入射侧的Co密度高于读出层与记录层之间的界面上的Co密度。因此，读出层的再现光入射侧的居里温度高，再现时的极性克尔旋转角度增加，从而实现再现信号质量的改善。另一方面，由于界面的居里温度低，所以可以抑制通过层之间的磁相互作用从平面到垂直发生的阈值温度的偏移，从而实现高质量再现信号而不需要更改再生所需的激光功率。

80. 发明授权

US5656385A Magnetic recording medium and information recording-reproduction method using the same 失效
标题翻译：磁记录介质和使用该磁记录介质的信息记录再现方法
公开(公告)号：US5656385A
公开(公告)日：1997-08-12
申请号：US88608
申请日：1993-07-07
申请人： Junsaku Nakajima , Akira Takahashi , Junji Hirokane , Yoshiteru Murakami , Kenji Ohta
发明人： Junsaku Nakajima , Akira Takahashi , Junji Hirokane , Yoshiteru Murakami , Kenji Ohta
IPC分类号： G11B11/10 , G03G5/16 , G11B5/00 , G11B5/02 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/74 , G11B11/105 , G11B13/04 , G11B19/02
CPC分类号： G03G5/16 , G11B11/10589 , G11B13/045 , G11B5/00 , G11B5/656 , G11B11/10504 , G11B11/10515 , G11B11/10532 , G11B19/02 , G11B2005/0002 , G11B2005/0021 , G11B5/74 , Y10S428/90
摘要： A magnetic recording medium having a recording layer made up of a ferrimagnetic material whose compensation temperature is included within room temperatures and an information recording-reproduction method using the magnetic recording medium. During recording, while a light beam is projected on the recording layer so as to raise the temperature of a recording portion, information is recorded by applying a signal magnetic field from a magnetic head. During reproduction, while a light beam is projected on a reproducing portion of the recording layer so as to raise the temperature thereof, information is reproduced by detecting leakage flux from the reproducing portion by the magnetic head. Thus, during reproduction, no magnetic flux is generated from other portions of the recording layer not irradiated by the light beam. With the arrangement, crosstalk due to leakage flux from adjoining tracks not irradiated by the optical beam can be eliminated. Therefore, track pitches can be made narrower so as to increase recording density of the magnetic recording medium. Further, since crosstalk from adjoining tracks is eliminated, a high S/N can be achieved.
摘要翻译：一种磁记录介质，其具有由补偿温度包括在室温内的铁氧体材料制成的记录层和使用该磁记录介质的信息记录再现方法。在记录期间，当光束投射在记录层上以提高记录部分的温度时，通过施加来自磁头的信号磁场来记录信息。在再现期间，当光束投射在记录层的再现部分上以升高其温度时，通过由磁头检测来自再现部分的漏磁通来再现信息。因此，在再现期间，不会由不被光束照射的记录层的其它部分产生磁通量。利用该布置，可以消除由于未被光束照射的相邻轨道的漏磁通引起的串扰。因此，可以使轨道间距更窄，以提高磁记录介质的记录密度。此外，由于消除了来自相邻轨道的串扰，可以实现高S / N。

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