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91. 发明授权

EP0354564B1 Magneto-optical memory element 失效
标题翻译：磁光存储元件
公开(公告)号：EP0354564B1
公开(公告)日：1996-01-10
申请号：EP89114796.9
申请日：1989-08-10
申请人： SHARP KABUSHIKI KAISHA
发明人： Murakami, Yoshiteru , Takahashi, Akira , Van, Kazuo , Nakayama, Junichiro , Katayama, Hiroyuki , Ohta, Kenji
IPC分类号： G11B7/24
CPC分类号： G11B11/10584 , G11B11/10586

92. 发明公开

EP0657880A2 Magneto-optical recording medium and manufacturing 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：EP0657880A2
公开(公告)日：1995-06-14
申请号：EP94309031.6
申请日：1994-12-05
申请人： SHARP KABUSHIKI KAISHA
发明人： Murakami, Yoshiteru , Takahashi, Akira , Iketani, Naoyasu , Ohta, Kenji
IPC分类号： G11B11/10
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：一种磁光记录介质包括：读出层，具有在室温下的面内磁化，并且其中温度升高时从面内磁化转变为垂直磁化;以及记录层，用于在其上记录信息。读出层的组成在垂直于其表面的方向上变化，并且在读出层中，光入射侧上的Co密度高于读出层和记录层之间界面上的Co密度。因此，读出层的再现光入射侧的居里温度高，并且再现时的极性克耳旋转角度增加，从而实现再现信号质量的改善。另一方面，由于界面上的居里温度低，所以可以抑制由层间的磁相互作用引起的从面内转变到垂直的阈值温度的偏移，由此实现高质量的再现信号而不用改变繁殖所需的激光功率。

93. 发明公开

EP0608134A2 Magneto-optical recording medium 失效
标题翻译：磁光记录介质
公开(公告)号：EP0608134A2
公开(公告)日：1994-07-27
申请号：EP94300430.9
申请日：1994-01-20
申请人： SHARP KABUSHIKI KAISHA
发明人： Nakayama, Junichiro , Takahashi, Akira , Murakami, Yoshiteru , Katayama, Hiroyuki , Ohta, Kenji
IPC分类号： G11B11/10
CPC分类号： G11B11/10586 , G11B11/10506 , G11B11/10515 , G11B11/10584
摘要： The magneto-optical recording medium is provided with a readout layer which shows the in-plane magnetization and which changes from the in-plane magnetization to the vertical magnetization when its temperature rises higher than a predetermined temperature by irradiation of the light beam, a memory layer which records information thereon magneto-optically, an intermediate layer which keeps in-plane magnetization from room temperatures to its Curie temperature, and an writing layer which has a Curie temperature higher than that of the memory layer and has coercive force lower than that of the memory layer. Since the intermediate layer becomes a domain wall in optical modulation recording, it prevents the memory layer and the writing layer from forming a domain wall, so information can be recorded in good condition. Moreover, a portion of the readout layer besides a center portion of the light beam shows the in-plane magnetization and masks the memory layer at playback. Therefore, a recording bit can be made small and recording density can be improved without increasing interference of signals from neighboring recording bits, which causes noises.
摘要翻译：该磁光记录介质具有读出层，该读出层示出面内磁化，并且当其温度通过光束的照射而升高到高于预定温度时从面内磁化变成垂直磁化，存储器其磁记录信息的磁记录层，保持从室温到居里温度的平面内磁化的中间层和居里温度高于存储层的居里温度并具有比矫顽力低的写入层的记录层内存层。由于中间层在光调制记录中成为畴壁，因此可以防止存储层和写入层形成畴壁，因此可以良好地记录信息。此外，除了光束的中心部分之外，读出层的一部分显示面内磁化并在回放时掩蔽存储层。因此，可以使记录位变小，并且可以提高记录密度而不增加来自相邻记录位的信号的干扰，这引起噪声。

94. 发明公开

EP0606129A2 Magneto-optical recording and reproducing device 失效
标题翻译： Vorrichtung zur magnetooptischen Aufzeichnung und Wiedergabe。
公开(公告)号：EP0606129A2
公开(公告)日：1994-07-13
申请号：EP94300001.8
申请日：1994-01-04
申请人： SHARP KABUSHIKI KAISHA
发明人： Murakami, Yoshiteru , Takahashi, Akira , Nakajima, Junsaku , Ohta, Kenji
IPC分类号： G11B11/10
CPC分类号： G11B11/10586 , G11B11/10515 , G11B11/10543
摘要： A magneto-optical recording and reproducing device is provided with a magneto-optical disk (201) for reproducing recorded information using light, a semiconductor laser (101), an objective lens (105) for converging a light beam emitted from the semiconductor laser onto the magneto-optical disk and a light interrupting member (120) for interrupting a portion of a light beam before it is incident on the objective lens. The magneto-optical disk is composed of a readout layer which is predominant in in-plane magnetization, and in which a transition occurs to be predominant in perpendicular magnetization as temperature thereof is raised and a recording layer for recording thereon information using a perpendicular magnetization. In this arrangement, since the light interrupting member is provided, a light spot can be made smaller, thereby improving a recording density. Moreover, even when temperature of the readout layer is raised due to a side lobe generated by the light interrupting member, in-plane magnetization is maintained in the readout layer. Thus, interference by unwanted reproducing signals due to the side lobe can be prevented, thereby improving a reproducing signal quality.
摘要翻译：磁光记录和再现装置设置有用于使用光再现记录信息的磁光盘，半导体激光器，用于将从半导体激光器发射的光束会聚到磁光盘上的物镜和光中断用于在光束入射到物镜之前中断光束的一部分。磁光盘由在面内磁化中占优势的读出层组成，其中随着其升高温度而在垂直磁化中发生转变，并且其中使用垂直磁化记录信息的记录层。在这种布置中，由于设置有遮光构件，因此可以使光点更小，从而提高记录密度。此外，即使由于由遮光构件产生的旁瓣而导致读出层的温度升高，在读出层中也保持平面内的磁化。因此，可以防止由于旁瓣引起的不期望的再现信号的干扰，从而提高再现信号质量。

95. 发明授权

EP0241007B1 Optical head 失效
标题翻译：光学头。
公开(公告)号：EP0241007B1
公开(公告)日：1994-01-12
申请号：EP87105191.8
申请日：1987-04-08
申请人： SHARP KABUSHIKI KAISHA
发明人： Takahashi, Akira , Deguchi, Toshihisa , Murakami, Yoshiteru , Mieda, Michinobu , Van, Kazuo , Ohta, Kenji
IPC分类号： G11B11/10
CPC分类号： G11B11/10532

96. 发明授权

EP0323232B1 Recording and reproducing device for magneto-optical card 失效
标题翻译：磁光卡的记录和再现装置
公开(公告)号：EP0323232B1
公开(公告)日：1993-09-08
申请号：EP88312367.1
申请日：1988-12-28
申请人： SHARP KABUSHIKI KAISHA
发明人： Takahashi, Akira , Murakami, Yoshiteru , Nakayama, Junichiro , Ohta, Kenji , Katayama, Hiroyuki , Mieda, Michinobu
IPC分类号： G11B11/10
CPC分类号： G11B11/10565 , G11B7/0033 , G11B11/10556 , G11B11/1056 , G11B11/10563 , G11B17/34

97. 发明公开

EP0527602A3 Optical memory 失效
标题翻译：光学记忆
公开(公告)号：EP0527602A3
公开(公告)日：1993-03-31
申请号：EP92307222.7
申请日：1992-08-07
申请人： SHARP KABUSHIKI KAISHA
发明人： Inui, Tetsuya , Takahashi, Akira , Ohta, Kenji , Mieda, Michinobu , Murakami, Yoshiteru
IPC分类号： G11B7/007 , G11B7/26 , G11B11/10 , G11B7/013
CPC分类号： G11B7/261 , G11B7/00454 , G11B7/007 , G11B7/0938 , G11B7/24 , G11B7/24079 , G11B7/26 , G11B11/10582
摘要： A transparent substrate of an optical memory is produced by injection molding using a stamper. Grooves and lands are alternately arranged on the optical memory, for tracking of light converged on the optical memory. The groove width is set in the range of 0.3 µm to 0.4 µm and the groove depth is set in the range of 80 nm to 100 nm. A decrease in the width of a land at each edge is restrained to 0.2 µm in maximum. With such dimensions, even when the track pitch is set to about 1.4 µm, it is possible to obtain a track crossing signal with intensity sufficient for performing an access operation to a target track. Moreover, since the dimensions bring about an improved reflectance at a land, the optical memory achieves an improved C/N and recording density.

98. 发明公开

EP0522500A2 Optical head device 失效
标题翻译： Optische Kopfanordnung。
公开(公告)号：EP0522500A2
公开(公告)日：1993-01-13
申请号：EP92111491.4
申请日：1992-07-07
申请人： SHARP KABUSHIKI KAISHA
发明人： Takahashi, Akira , Murakami, Yoshiteru , Nakajima, Junsaku , Ohta, Kenji
IPC分类号： G11B11/10
CPC分类号： G11B11/10545 , G11B11/10515
摘要： A magneto-optical disk (23) has a recording layer (4) whereon recorded bits are formed by the magnetic field modulation method and a readout layer (3) whose axis of easy magnetization is parallel to the recording layer (4) at room temperature, and varies to be perpendicular to the recording layer (4) within a predetermined temperature range between room temperature and the Curie temperature. During reproduction of recorded bits a first semiconductor laser (10) emits a heating-use light beam (7) to form the first light spot on the readout layer (3). 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 (11) emits a reproduction-use light beam (8) such that the second light spot is formed on the readout layer (3) 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 reproduction signals can be obtained from the magneto-optical disk (23) inspite of information high density information recording.
摘要翻译：磁光盘（23）具有通过磁场调制方法形成记录位的记录层（4）和在室温下容易磁化的轴平行于记录层（4）的读出层（3）并且在室温和居里温度之间的预定温度范围内变化为垂直于记录层（4）。在记录位再现期间，第一半导体激光器（10）发射加热用光束（7）以在读出层（3）上形成第一光点。因此，对应于预定温度范围的环形区域表现出垂直的磁各向异性，并且将记录的位从记录层复制到环形区域上。当第一个光点被移位时，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（11）发射再现用光束（8），使得第二光点形成在读出层（3）上，以在其后部与第一光点重叠。因此，可以再现仅复制到环形区域的后部的一个记录位。因此，可以从信息高密度信息记录的磁光盘（23）获得高品质再现信号。

99. 发明公开

EP0456452A3 Magneto-optical disk and method of manufacturing the same 失效
标题翻译：磁光盘及其制造方法
公开(公告)号：EP0456452A3
公开(公告)日：1992-09-30
申请号：EP91304086.1
申请日：1991-05-07
申请人： SHARP KABUSHIKI KAISHA
发明人： Murakami, Yoshiteru , Nakayama, Junichiro , Katayama, Hiroyuki , Takahashi, Akira , Ohta, Kenji , Toki, Hirotaka
IPC分类号： G11B11/10 , G11B23/00
CPC分类号： G11B23/0042 , G11B11/10582 , G11B11/10584
摘要： A magneto-optical disk comprises a substrate (1) whereon a recording medium (2) is formed, and a depression (1b) is formed on the substrate radially inwardly of the recording medium. A center hub (4) is installed on the depression such that the surface of the center hub is substantially level with the surface of a protective resin layer (3) covering the recording medium. On the center hub, a flying head performs CSS (Contact Start and Stop). This configuration of the disk eliminates the occurrence of dust due to the abrasion and head crash, and achieves stable CSS. A method of manufacturing such a magneto-optical disk includes the step of forming the protective resin layer after installing the center hub on the depression. In this method, since no space is produced between the center hub and the protective resin layer, stable flying characteristics of the head are obtained. Also, a magneto-optical disk is provided whereon small physical bumps and pits (15) are formed on the substrate (1) at a region (B₂) lying radially inwardly of the recording medium, to prevent the flying head from sticking to the disk. A method of manufacturing this magneto-optical disk employs a stamper (16), which permits the disk to be mass produced.

100. 发明公开

EP0471527A3 Magnetic recording medium and information recording-reproduction method using the same 失效
标题翻译：磁记录介质和信息记录再现方法
公开(公告)号：EP0471527A3
公开(公告)日：1992-03-11
申请号：EP91307371.4
申请日：1991-08-09
申请人： SHARP KABUSHIKI KAISHA
发明人： Nakajima, Junsaku , Takahashi, Akira , Hirokane, Junji , Murakami, Yoshiteru , Ohta, Kenji
IPC分类号： G11B11/10
CPC分类号： G11B5/653 , G03G5/16 , G11B5/00 , G11B5/656 , G11B11/10504 , G11B11/10515 , G11B11/10532 , G11B11/10589 , G11B13/045 , G11B19/02
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.

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