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81. 发明授权

US5452272A Magneto-optical recording and reproducing device having light interrupting forming main robe and side robe light beam portions 失效
标题翻译：具有遮光形成主袍和侧蓬灯光部分的磁光记录和再现装置
公开(公告)号：US5452272A
公开(公告)日：1995-09-19
申请号：US175748
申请日：1993-12-30
申请人： Yoshiteru Murakami , Junsaku Nakajima , Akira Takahashi , Kenji Ohta
发明人： Yoshiteru Murakami , Junsaku Nakajima , Akira Takahashi , Kenji Ohta
IPC分类号： G11B7/135 , G11B11/10 , G11B11/105 , G11B11/00
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 for reproducing recorded information using light, a semiconductor laser, an objective lens for converging a light beam emitted from the semiconductor laser onto the magneto-optical disk and a light interrupting member 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 robe 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 robe 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。磁光盘由在平面磁化中占主要地位的读出层组成，其中随着温度的升高而在垂直磁化中发生转移，而在其中利用垂直磁化记录信息的记录层。在这种布置中，由于设置了遮光构件，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侧蓬而导致读出层的温度上升，在读出层中也保持平面内的磁化。因此，可以防止由于侧灯引起的不必要的再现信号的干扰，从而提高再现信号质量。

82. 发明授权

US5563852A Magneto-optical recording medium having a readout layer with varying composition and curie temperature 失效
标题翻译：磁光记录介质具有不同组成和居里温度的读出层
公开(公告)号：US5563852A
公开(公告)日：1996-10-08
申请号：US350317
申请日：1994-12-05
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 , 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。

83. 发明授权

US5202860A Magneto-optic reproducing device using right and left circularly polarized light 失效
标题翻译：使用右侧和左侧圆形偏振光的磁光复制装置
公开(公告)号：US5202860A
公开(公告)日：1993-04-13
申请号：US664183
申请日：1991-03-04
申请人： Akira Takahashi , Yoshiteru Murakami , Junsaku Nakayima , Kenji Ohta
发明人： Akira Takahashi , Yoshiteru Murakami , Junsaku Nakayima , Kenji Ohta
IPC分类号： G11B11/105
CPC分类号： G11B11/10545
摘要： A reproducing optical device for a magneto-optical recording medium related to the present invention having light sources that emit linearly polarized lights towards a magneto-optical recording medium, polarization directions of the linearly polarized lights being mutually orthogonal. A quarter wavelength plate disposed between the recording medium and the light sources converts each of the linearly polarized lights into right and left circularly polarized lights respectively. Corresponding to recorded information, the recording medium has magnetized sections that are magnetized in a perpendicularly upward and downward direction with respect to a medium surface. Moreover, the recording medium displays the property of circular dichroism. When the right circularly polarized light and the left circularly polarized light are reflected off the recording medium, a first and a second photodetector generate a first and a second reproduced signal respectively, based on variation in reflected light intensity of each of the circularly polarized lights. This variation corresponds to the upward and the downward magnetization directions of the magnetized sections and is due to the circular dichroism effect. There is a phase difference of half a cycle between the first and the second reproduced signal and the signals vary inversely with respect to each other. Consequently, disk noise is cancelled by differentially amplifying the first and the second reproduced signal, and an SN ratio of a reproduced signal thereby can be improved.

84. 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。

85. 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。

86. 发明授权

US5631096A Magneto optical memory device 失效
标题翻译：磁光存储器件
公开(公告)号：US5631096A
公开(公告)日：1997-05-20
申请号：US400464
申请日：1995-03-07
申请人： Junsaku Nakajima , Yoshiteru Murakami , Kenji Ohta , Akira Takahashi
发明人： Junsaku Nakajima , Yoshiteru Murakami , Kenji Ohta , Akira Takahashi
IPC分类号： G11B11/10 , G11B11/105 , G11B5/66
CPC分类号： G11B11/10508 , G11B11/10515 , G11B11/10586 , G11B11/10521 , Y10S428/90
摘要： A magneto-optical memory device is provided with a base whereon a first magnetic film which exhibits in-plane magnetization at room temperature and exhibits perpendicular magnetization at above room temperature, a second magnetic film having its Curie temperature above room temperature; and a third magnetic film having its Curie temperature set above the Curie temperature of the second magnetic film, which exhibits perpendicular magnetization in a temperature range between room temperature and Curie temperature are laminated in this order. When recording, the temperature of the third magnetic film is raised to the vicinity of its Curie temperature, and information is recorded thereon by an external magnetic field. As the magnetization of the second magnetic film having a temperature rise above its Curie temperature disappears, an exchange coupling force is not exerted between the first magnetic film and the third magnetic film. In the above arrangement, since the effect from the magnetization of the first magnetic film can be avoided, information can be recorded on the third magnetic film by a small external magnetic field, thereby permitting a reduction in electric power consumption and in the size of the apparatus.
摘要翻译：磁光存储器件设置有第一磁性膜的基底，第一磁性膜在室温下表现出平面内的磁化强度，并且在室温以上表现出垂直的磁化强度，第二磁性膜的居里温度高于室温; 并且将其居里温度设定在高于室温和居里温度之间的温度范围内的垂直磁化强度的第二磁性膜的居里温度的第三磁性膜依次层叠。当记录时，第三磁性膜的温度升高到其居里温度附近，并且通过外部磁场在其上记录信息。随着具有高于其居里温度的温度升高的第二磁性膜的磁化消失，在第一磁性膜和第三磁性膜之间不产生交换耦合力。在上述结构中，由于可以避免第一磁性膜的磁化的影响，所以可以通过小的外部磁场将信息记录在第三磁性膜上，从而能够降低电力消耗和仪器。

87. 发明授权

US5615182A Magneto-optical disk and the reproducing method thereof 失效
标题翻译：磁光盘及其再现方法
公开(公告)号：US5615182A
公开(公告)日：1997-03-25
申请号：US511283
申请日：1995-08-04
申请人： Yoshiteru Murakami , Junsaku Nakajima , Akira Takahashi , Junichiro Nakayama , Kenji Ohta
发明人： Yoshiteru Murakami , Junsaku Nakajima , Akira Takahashi , Junichiro Nakayama , Kenji Ohta
IPC分类号： G11B11/10 , G11B11/105 , G11B11/00
CPC分类号： G11B11/10515 , G11B11/10595
摘要： A magneto-optical disk, which possesses a disc-shaped substrate and a recording layer composed of a perpendicular magnetization film that is formed on the substrate, characterized in having: an area wherein magnetic domains having an upward magnetization and magnetic domains having a downward magnetization are alternately aligned along at least one circuit of the disk, the area being formed on the recording layer, the length of the magnetic domains having the upward magnetization being virtually equal to the length of the magnetic domains having the downward magnetization. This invention also has a reproducing method which is characterized in that, when information is reproduced by projecting a light beam onto the magneto-optical recording disk, the intensity of the light beam is adjusted so as to maximize the amplitude of a reproduced signal that is obtained from the area. With the above arrangement, a high-quality reproduced signal can be obtained independent of the characteristics of individual magneto-optical disks.
摘要翻译：一种磁光盘，其具有盘形基板和由形成在基板上的垂直磁化膜构成的记录层，其特征在于具有：具有向上磁化的磁畴和具有向下磁化的磁畴的区域沿着盘的至少一个电路交替排列，所述区域形成在记录层上，具有向上磁化的磁畴的长度实质上等于具有向下磁化的磁畴的长度。本发明还具有一种再现方法，其特征在于，当通过将光束投射到磁光记录盘上来再现信息时，调整光束的强度，以使得再现信号的幅度最大化从该地区获得。通过上述配置，可以独立于各个磁光盘的特性来获得高质量的再生信号。

88. 发明授权

US5499229A Track scanning for reproducing address information by crosstalk 失效
标题翻译：跟踪扫描以通过串扰再现地址信息
公开(公告)号：US5499229A
公开(公告)日：1996-03-12
申请号：US346759
申请日：1994-11-30
申请人： Yoshiteru Murakami , Akira Takahashi , Kenji Ohta
发明人： Yoshiteru Murakami , Akira Takahashi , Kenji Ohta
IPC分类号： G11B7/24 , G11B7/007 , G11B7/09 , G11B11/10 , G11B11/105 , G11B27/10 , G11B7/00
CPC分类号： G11B11/10515 , G11B11/10578 , G11B7/00718 , G11B7/00745 , G11B7/0938
摘要： On an optical disk, information is recorded on both grooves and lands as guide tracks for guiding a light beam. The width of each groove and that of each land are set substantially equal to each other. A plurality of series of pits representing address information are formed in the grooves so that the series of pits in a groove and the series of pits in the adjacent grooves are located in different radial directions of the optical disk. Address pits are not formed in any of the tracks formed by the lands. When the light beam scans the track on the land, the address information is obtained by crosstalk of the series of address pits formed in the track on the groove. This structure enables the management of the addresses of tracks having thereon no address pits. When obtaining the address information by reproducing the series of address pits on the groove, since no crosstalk occurs, accurate address information is obtained.
摘要翻译：在光盘上，信息被记录在两个凹槽和平台上，作为用于引导光束的导轨。每个槽的宽度和每个焊盘的宽度被设定为基本相等。在凹槽中形成表示地址信息的多个凹坑系列，使得凹槽中的一系列凹坑和相邻凹槽中的一系列凹坑位于光盘的不同径向方向上。地址凹坑不形成在由平台形成的任何轨道中。当光束扫描地面上的轨道时，通过在凹槽中的轨道中形成的一系列地址坑的串扰获得地址信息。这种结构使得能够管理其上没有地址坑的轨道的地址。当通过在凹槽上再现一系列地址坑来获得地址信息时，由于没有发生串扰，因此获得了准确的地址信息。

89. 发明授权

US5475658A Magneto-optical recording device for improving C/N ratio 失效
标题翻译：用于提高C / N比的磁光记录装置
公开(公告)号：US5475658A
公开(公告)日：1995-12-12
申请号：US320135
申请日：1994-10-07
申请人： Akira Takahashi , Yoshiteru Murakami , Kenji Ohta
发明人： Akira Takahashi , Yoshiteru Murakami , Kenji Ohta
IPC分类号： G11B11/10 , G11B5/02 , G11B11/105 , G11B13/04
CPC分类号： G11B11/10595 , G11B11/10508
摘要： A magneto-optical recording device having a light source and external magnetic field applying apparatus, which records information on a magneto-optical recording medium with a magnetic field modulation method. The device has a controller which stops the irradiation of a light beam when switching the direction of applying external magnetic field during recording. This allows an area where information is recorded with a low external magnetic field to be smaller, and thereby achieving reproduced signal of improved quality.
摘要翻译：一种具有光源和外部磁场施加装置的磁光记录装置，其利用磁场调制方法在磁光记录介质上记录信息。该装置具有在记录期间切换施加外部磁场的方向时停止光束的照射的控制器。这允许以低外部磁场记录信息的区域更小，从而实现质量提高的再现信号。

90. 发明授权

US5059473A Optical recording medium and manufacturing method thereof 失效
标题翻译：光学记录介质及其制造方法
公开(公告)号：US5059473A
公开(公告)日：1991-10-22
申请号：US308018
申请日：1989-02-09
申请人： Akira Takahashi , Michinobu Mieda , Yoshiteru Murakami , Junichiro Nakayama , Tomoyuki Miyake , Kenji Ohta
发明人： Akira Takahashi , Michinobu Mieda , Yoshiteru Murakami , Junichiro Nakayama , Tomoyuki Miyake , Kenji Ohta
IPC分类号： G11B7/24 , G11B7/26 , G11B11/10 , G11B11/105
CPC分类号： G11B11/10584 , G11B7/26 , Y10S430/146 , Y10T428/239 , Y10T428/24529 , Y10T428/31507
摘要： An optical recording medium, which is used as an optical disc, optical card or the like for optically recording, reproducing, erasing and the like, includes a center substrate having formed on at least one side thereof recesses and/or protrusions. Recording films are formed on both sides thereof and transparent protective plates bonded to these recording films respectively. This arrangement substantially eliminates warping of the substrates constituting the optical recording medium and exfoliation of substrates or the like even when the optical recording medium is subjected to sudden changes in temperature. This optical recording medium demonstrates enhanced optical performance and protective effect. The selecting of the transparent protective plate is simplified because the forming recesses and/or protrusions is not a factor. By producing an optical recording medium utilizing the above features, the carrier-to-noise ratio and isotropy of the medium is improved.

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