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。

公开(公告)号：USRE35629E

公开(公告)日：1997-10-14

申请号：US136019

申请日：1993-10-14

申请人： Yoshiteru Murakami ,  Akira Takahashi ,  Kazuo Van ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Kenji Ohta

发明人： Yoshiteru Murakami ,  Akira Takahashi ,  Kazuo Van ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B7/24

CPC分类号： G11B11/10584 ,  G11B11/10586

摘要： A magneto-optical memory element has a multi-layer construction in the order from a side first receiving light from a light-source which includes a first transparent dielectric film, a rare earth transition metal alloy film, a second transparent dielectric film and a reflective film. The magneto-optical device uses circular dichroism effect of a magnetic mater for reading information. The rare earth transition metal alloy film has a refractive index represented by n.+-..DELTA.n wherein n=3.2-3.55i and .DELTA.n=0.05-0.03i. The thickness of film is about 18 to 46 nm. The second transparent dielectric film has a refractive index of 2.0.+-.0.2 and a film thickness of 80 to 108 nm.

摘要翻译： 磁光存储元件具有从第一次接收来自光源的一侧的顺序的多层结构，该光源包括第一透明电介质膜，稀土过渡金属合金膜，第二透明电介质膜和反射 电影。 磁光装置使用磁性体的圆二色性来读取信息。 稀土过渡金属合金膜的折射率为n +/- DELTA n，n = 3.2-3.55i，DELTA n = 0.05-0.03i。 膜的厚度为约18至46nm。 第二透明电介质膜的折射率为2.0 +/- 0.2，膜厚为80〜108nm。

公开(公告)号：US5053611A

公开(公告)日：1991-10-01

申请号：US287053

申请日：1988-12-21

申请人： Akira Takahashi ,  Yoshiteru Murakami ,  Junichiro Nakayama ,  Kenji Ohta ,  Hiroyuki Katayama ,  Michinobu Mieda

发明人： Akira Takahashi ,  Yoshiteru Murakami ,  Junichiro Nakayama ,  Kenji Ohta ,  Hiroyuki Katayama ,  Michinobu Mieda

IPC分类号： G11B11/10 ,  G11B7/0033 ,  G11B11/105 ,  G11B17/34

CPC分类号： G11B11/10565 ,  G11B11/10556 ,  G11B11/1056 ,  G11B11/10563 ,  G11B17/34 ,  G11B7/0033

摘要： A recording and reproducing device for a magneto-optical card includes an optical head for irradiating a magneto-optical recording medium of a magneto-optical card placed into the device with a laser beam. A magnetic field generator applies a biased magnetic field to the magneto-optical recording medium, and an optical system manipulating mechanism for the optical system of the above-mentioned optical head varies the spot irradiated by the laser beam. The optical head is fixed to the main frame of the device. The magneto-optical card is also supported where it is irradiated by the laser beam emitted from the optical head. The magneto-optical card is moved in a plane parallel to the surface of the magneto-optical card for rough searching and then a part of or the whole magnetic field generator is moved to come into contact with the magneto-optical card to stop the vibration of the magneto-optical card. The spot to be irradiated by the laser beam is then varied by means of the optical system of the optical head.

公开(公告)号：US4917751A

公开(公告)日：1990-04-17

申请号：US328743

申请日：1989-03-20

申请人： Kenji Ohta ,  Hiroyuki Katayama ,  Akira Takahashi ,  Yoshiteru Murakami ,  Junji Hirokane

发明人： Kenji Ohta ,  Hiroyuki Katayama ,  Akira Takahashi ,  Yoshiteru Murakami ,  Junji Hirokane

IPC分类号： B29C35/08 ,  B29C70/08 ,  G11B7/26 ,  G11B11/105

CPC分类号： G11B7/26 ,  B29C35/08 ,  B29C70/086 ,  B29C2035/0827 ,  B29L2017/005 ,  G11B11/10584 ,  Y10T156/1097 ,  Y10T156/1098

摘要： Double sided optical memory disks are produced by dropping a viscous adhesive material hardenable by ultraviolet radiation at predetermined longitudinal intervals onto an elongated cloth material of uniform thickness thereby causing the adhesive material to become absorbed by and contained in the cloth material, thereafter placing this cloth material sandwichedly between two optical disk pieces each containing a recording layer, thereafter applying pressure between these pieces such that the sandwiching pieces remain separated uniformly by a predetermined separation distance, and thereafter applying ultraviolet radiation to and thereby hardening the adhesive material while the disk pieces are maintained at the uniform separation distance.

摘要翻译： 双面光学记忆盘是通过将能够以预定的纵向间隔使紫外线辐射固化的粘性粘合剂材料滴落到均匀厚度的细长布料上制成的，从而使粘合剂材料被布料吸收并包含在布料中，然后将该布料 夹在两个光盘片之间，每个光盘片均包含记录层，然后在这些片之间施加压力，使得夹持片保持均匀分离预定的间隔距离，然后在保持盘片的同时施加紫外线辐射，从而硬化粘合剂材料 在均匀分离距离。

公开(公告)号：US4719137A

公开(公告)日：1988-01-12

申请号：US721707

申请日：1985-04-10

申请人： Kenji Ohta ,  Akira Takahashi ,  Hiroyuki Katayama ,  Junji Hirogane ,  Yoshiteru Murakami

发明人： Kenji Ohta ,  Akira Takahashi ,  Hiroyuki Katayama ,  Junji Hirogane ,  Yoshiteru Murakami

IPC分类号： G11B11/105 ,  G11B7/24

CPC分类号： G11B11/10586 ,  G11B11/10593 ,  Y10S428/90 ,  Y10S430/146 ,  Y10T428/22 ,  Y10T428/31678

摘要： A magneto-optic memory element includes a GdTbFe recording layer sandwiched between a pair of transparent AlN dielectric layers. At least one of the pair of transparent AlN dielectric layers is extended to have a size larger than the GdTbFe recording layer so as to cover the peripheral edge of the GdTbFe recording layer, thereby protecting the GdTbFe recording layer from oxygen and moisture. An Al-Ni alloy reflection film is formed on one of the pair of transparent AlN dielectric layers in order to increase the apparent Kerr rotation angle produced by the magneto-optic memory element.

公开(公告)号：US5705286A

公开(公告)日：1998-01-06

申请号：US163096

申请日：1993-12-07

申请人： Junji Hirokane ,  Yoshiteru Murakami ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

发明人： Junji Hirokane ,  Yoshiteru Murakami ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B5/66

CPC分类号： G11B11/10586 ,  Y10S428/90

摘要： A magneto-optical recording medium has an exchange-coupled triplilayer film wherein a readout layer which 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 above T.sub.1, an intermediate layer which has perpendicular magnetization at room temperature, the perpendicular magnetization being maintained from room temperature to Curie temperature T.sub.3, and a recording layer which has perpendicular magnetization at room temperature, the perpendicular magnetization been maintained from room temperature to Curie temperature T.sub.2 which are laminated in this order, and the temperatures T.sub.1, T.sub.2 and T.sub.3 satisfy the following inequality: T.sub.1

摘要翻译： 磁光记录介质具有交换耦合三层膜，其中在室温下具有面内磁化的读出层，并且其温度升高到T1以上时从平面内磁化转变为垂直磁化的读出层， 在室温下具有垂直磁化的中间层，垂直磁化维持在室温至居里温度T3，以及在室温下具有垂直磁化的记录层，垂直磁化维持在室温至居里温度T2之间，层压 按照该顺序，温度T1，T2和T3满足以下不等式：T1

公开(公告)号：US5305254A

公开(公告)日：1994-04-19

申请号：US993517

申请日：1992-12-17

申请人： Yoshiteru Murakami ,  Junichiro Nakayama ,  Ichiro Hiramatsu ,  Akira Takahashi ,  Kenji Ohta ,  Kazuo Van ,  Hiroyuki Katayama

发明人： Yoshiteru Murakami ,  Junichiro Nakayama ,  Ichiro Hiramatsu ,  Akira Takahashi ,  Kenji Ohta ,  Kazuo Van ,  Hiroyuki Katayama

IPC分类号： G11B5/64 ,  G11B11/105 ,  G11C13/04

CPC分类号： G11B5/64 ,  G11B11/10582

摘要： A magneto-optic memory device, such as a magneto-optic disk or magneto-optic card having a pair of opposed substrates at least one of which is transparent. Between the substrates is a magneto-optic memory layer made of a stack of dielectric film, a rear earth-transition metal alloy thin film, a dielectric film and a light reflecting film built on the surface of the transparent substrate opposed to the other substrate. An adhesive layer covers the memory layer and bonds the transparent substrate to the other substrate. Lastly, a metal nitride film interposed between the light reflecting film of the memory layer and the adhesive layer.

摘要翻译： 磁光存储器件，例如磁光盘或磁光卡，其具有一对相对的衬底，其中至少一个是透明的。 在基板之间是由与介质膜叠层构成的磁光存储层，后置接地 - 过渡金属合金薄膜，电介质膜和反射膜构成在与其他基板相对的透明基板的表面上。 粘合剂层覆盖存储层并将透明基底粘合到另一个基底上。 最后，介于存储层的光反射膜和粘合剂层之间的金属氮化物膜。

公开(公告)号：US5002813A

公开(公告)日：1991-03-26

申请号：US384254

申请日：1989-07-21

申请人： Junichiro Nakayama ,  Kenji Ohta ,  Hiroyuki Katayama ,  Akira Takahashi ,  Yoshiteru Murakami

发明人： Junichiro Nakayama ,  Kenji Ohta ,  Hiroyuki Katayama ,  Akira Takahashi ,  Yoshiteru Murakami

IPC分类号： B42D15/10 ,  G06K19/06 ,  G11B7/24 ,  G11B7/26

CPC分类号： G11B7/26 ,  Y10S428/913 ,  Y10S430/146 ,  Y10T156/10 ,  Y10T428/239 ,  Y10T428/31507

摘要： A substrate for manufacturing an optical memory device includes one surface covered with a protective film provided with openings only in portions corresponding to recording layers to be formed on the substrate, thereby allowing the protective film to function as a mask for forming the recording layers in a recording layer forming process. Also disclosed is a method of manufacturing an optical memory device including the steps of continuously feeding a substrate covered with a protective film provided with openings only in portions corresponding to recording layers to be formed on the substrate, forming the recording layers through the openings on the substrate, forming guide tracks on the substrate, stripping the protective film from the substrate, cutting the substrate to a predetermined size, and forming a protective layer on the substrate.

摘要翻译： 用于制造光学存储器件的衬底包括一个被保护膜覆盖的表面，该保护膜仅在对应于要形成在衬底上的记录层的部分中具有开口，从而允许保护膜用作掩模，用于形成记录层 记录层形成过程。 还公开了一种制造光学存储器件的方法，包括以下步骤：将覆盖有保护膜的衬底连续地供给到仅在对应于要形成在衬底上的记录层的部分上的开口，通过上述开口形成记录层 基板，在基板上形成引导轨道，从基板剥离保护膜，将基板切割成预定尺寸，以及在基板上形成保护层。

公开(公告)号：US5662988A

公开(公告)日：1997-09-02

申请号：US387294

申请日：1995-02-10

申请人： Junichiro Nakayama ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta ,  Yoshiteru Murakami

发明人： Junichiro Nakayama ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta ,  Yoshiteru Murakami

IPC分类号： G11B11/105 ,  G11B11/10 ,  G11B13/04

CPC分类号： G11B11/10586 ,  G11B11/10506 ,  G11B11/10515 ,  Y10S428/90 ,  Y10S430/146 ,  Y10T428/12632 ,  Y10T428/12861 ,  Y10T428/12986 ,  Y10T428/24942 ,  Y10T428/31678

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： 磁光记录介质设置有读出层，该读出层显示平面内的磁化强度，并且当读出层的温度通过照射光束而升高到高于预定温度时，其从平面内磁化强度变化到垂直磁化强度;存储器 在磁光上记录信息的层，将室内的平面磁化保持到其居里温度的中间层，以及具有比存储层的居里温度高的居里温度并具有低于存储层的矫顽力的矫顽力的写层 内存层。 由于中间层成为光调制记录中的畴壁，因此防止存储层和写入层形成畴壁，因此可以将信息记录在良好状态。 此外，除了光束的中心部分之外，读出层的一部分表示平面内磁化，并且在重放时掩蔽存储层。 因此，可以使记录位小，并且可以提高记录密度，而不会增加来自相邻记录位的信号的干扰，这导致噪声。

公开(公告)号：US5353278A

公开(公告)日：1994-10-04

申请号：US694990

申请日：1991-05-02

申请人： Yoshiteru Murakami ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta ,  Hirotaka Toki

发明人： Yoshiteru Murakami ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta ,  Hirotaka Toki

IPC分类号： G11B11/105 ,  G11B23/00 ,  G11B5/54

CPC分类号： G11B23/0042 ,  G11B11/10582 ,  G11B11/10584

摘要： A magneto-optical disk comprising a substrate whereon a recording medium is formed, and a depression is formed on the substrate on the inside of the recording medium of the substrate. A center hub is installed on the depression such that the center hub is substantially level with a protective resin layer 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 the magneto-optical disk, wherein the protective resin layer is formed after installing the center hub on the depression. In this method, since a space is not produced between the center hub and the protective resin layer, the stable flying characteristics is obtained. And a magneto-optical disk whereon small physical bumps and pits are formed on the substrate on the inside of the recording medium, which prevents the flying head from sticking to the disk. A method of manufacturing the magneto-optical disk by using a stamper, which permits the disk to be mass produced.

摘要翻译： 一种磁光盘，包括形成记录介质的基板，并且在基板的记录介质的内侧上的基板上形成凹陷。 中心毂安装在凹陷处，使得中心毂基本上与覆盖记录介质的保护树脂层水平。 在中心枢纽上，飞头执行CSS（联系人启动和停止）。 盘的这种配置消除了由于磨损和头部碰撞引起的灰尘的发生，并且实现了稳定的CSS。 一种制造磁光盘的方法，其中在将中心毂安装在凹陷部之后形成保护树脂层。 在该方法中，由于在中心轮毂和保护树脂层之间不产生空间，因此获得了稳定的飞行特性。 另外，在记录介质的内侧的基板上形成小的物理凸点和凹坑的磁光盘，防止飞头粘附到盘上。 通过使用压模来制造磁光盘的方法，该压模允许大量生产盘。