公开(公告)号：US5719831A

公开(公告)日：1998-02-17

申请号：US768794

申请日：1996-12-18

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

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

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B23/03 ,  G11B11/00

CPC分类号： G11B23/0321 ,  G11B11/10552 ,  G11B23/03

摘要： A magneto-optical disk cartridge includes a magnet which is magnetized substantially parallel to a surface of a magneto-optical disk for generating an initializing magnetic field. This structure permits a reduction in the thickness of the magneto-optical disk cartridge.

摘要翻译： 磁光盘盒包括磁体，该磁体基本上平行于磁光盘的表面而被磁化，用于产生初始化磁场。 这种结构允许减小磁光盘盒的厚度。

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：US5665467A

公开(公告)日：1997-09-09

申请号：US196978

申请日：1994-02-15

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

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

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 first magnetic layer, a second magnetic layer and a third magnetic layer respectively made of rare-earth-transition metal alloys which are laminated in this order. The first magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The second magnetic layer made of GdFeCo is set such that its Curie temperature is higher than the Curie temperature of the first magnetic layer, coercive force thereof at room temperature is nearly zero, and that it has an in-plane magnetization at room temperature and a transition occurs therein from the in-plane magnetization to the perpendicular magnetization at above a predetermined temperature. The third magnetic layer is set such that it has a perpendicular magnetization in a temperature range of room temperature and its Curie temperature, its Curie temperature is higher than the Curie temperature of the first magnetic layer, and coercive force thereof at room temperature is smaller than the coercive force of the first magnetic layer.

摘要翻译： 磁光记录介质包括依次层叠的分别由稀土 - 过渡金属合金制成的第一磁性层，第二磁性层和第三磁性层。 第一磁性层在室温和居里温度之间的温度范围内具有垂直磁化强度。 由GdFeCo制成的第二磁性层的居里温度设定为高于第一磁性层的居里温度，室温下的矫顽力接近零，在室温下具有面内磁化强度， 在从预定温度以上的面内磁化强度向垂直磁化发生。 第三磁性层被设定为使其在室温的温度范围内具有垂直磁化强度和居里温度，居里温度高于第一磁性层的居里温度，室温下的矫顽力小于 第一磁性层的矫顽力。

公开(公告)号：US5615180A

公开(公告)日：1997-03-25

申请号：US198620

申请日：1994-02-18

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

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

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10586 ,  G11B11/10534 ,  G11B11/10506 ,  G11B11/10519 ,  G11B11/10523

摘要： A magneto-optical disk is provided with a recording layer that exhibits perpendicular magnetization, an intermediate layer wherein in-plane magnetization occurs at room temperature and a transition from the in-plane magnetization to perpendicular magnetization occurs as the temperature thereof rises, and an auxiliary layer that is made of a rare-earth-transition-metal alloy and that exhibits perpendicular magnetization, and these layers are laminated in this order. The composition of the rare-earth-transition-metal alloy is set so that the magnetic moment of the rare-earth metal is relatively greater than that of the transition metal at room temperature and the compensation temperature is located between room temperature and the Curie temperature T.sub.c3. A magneto-optical recording apparatus for rewriting information on the magneto-optical disk is provided with a single magnet for applying H.sub.w onto a portion on the magneto-optical disk irradiated by a light beam, as well as for applying H.sub.init having a greater intensity than H.sub.w onto a portion that is apart from the portion irradiated by the light beam. This arrangement makes it possible to achieve a more compact, thinner magneto-optical recording apparatus which allows light-modulation overwriting.

摘要翻译： 磁光盘设置有表现出垂直磁化的记录层，其中在室温下发生面内磁化的中间层，并且随着其温度升高而发生从平面内磁化到垂直磁化的转变，辅助 层，其由稀土 - 过渡金属合金制成并且呈现垂直磁化，并且这些层依次层压。 设定稀土 - 过渡金属合金的组成使得稀土金属的磁矩在室温下比过渡金属的磁矩更大，并且补偿温度位于室温和居里温度之间 Tc3。 用于在磁光盘上重写信息的磁光记录装置设置有用于将Hw施加到由光束照射的磁光盘上的部分上的单个磁体，以及用于施加具有比光束更大的强度的Hinit Hw到与光束照射的部分分开的部分。 这种布置使得可以实现允许光调制重写的更紧凑，更薄的磁光记录装置。

公开(公告)号：US5347510A

公开(公告)日：1994-09-13

申请号：US4266

申请日：1993-01-14

申请人： Junji Hirokane ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Kenji Ohta

发明人： Junji Hirokane ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Kenji Ohta

IPC分类号： G01Q80/00 ,  G11B7/007 ,  G11B7/24 ,  G11B7/26

CPC分类号： G11B7/24076 ,  G11B7/261

摘要： A master plate for manufacturing a stamper for injecting molding of an optical memory device has a substrate having a plurality of guiding grooves on a surface thereof with a predetermined interval. The respective edge portions of the guiding grooves are inclined with respect to the surface of the substrate at an angle not more than 30.degree.. According to a manufacturing method of the master plate, the post-baking process is carried out at a baking temperature of not less than 150.degree. C. and an etching gas containing O.sub.2 gas of 4 (SCCM) to 10 (SCCM) is used. Thus, even when the copying is carried out with respect to the substrate of the optical memory device according to the injection molding process wherein the stamper, which is manufactured based on the above-mentioned master plate, is used, the mold release of the stamper can be carried out without being caught by the substrate. Thus, it is possible to keep the respective shapes of the guiding grooves of the s tamper, thereby enabling of manufacturing the substrate of the optical memory device with high repeatability.

摘要翻译： 用于制造用于注射成型光学存储器件的压模的母板具有在其表面上以预定间隔具有多个导向槽的衬底。 引导槽的各个边缘部分相对于基板的表面以不大于30°的角度倾斜。 根据主板的制造方法，后烘烤处理在不低于150℃的烘烤温度下进行，并且使用含有4（SCCM）至10（SCCM）的O 2气体的蚀刻气体。 因此，即使在使用根据上述主板制造的压模的注射成型工艺相对于光学存储器件的基板进行复印时，压模的脱模 可以在不被基材捕获的情况下进行。 因此，可以保持篡改器的引导槽的各自的形状，从而能够以高重复性制造光学存储器件的基板。

公开(公告)号：US5193082A

公开(公告)日：1993-03-09

申请号：US502104

申请日：1990-03-29

申请人： Tomoyuki Miyake ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

发明人： Tomoyuki Miyake ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B5/02 ,  G11B5/127 ,  G11B7/12 ,  G11B7/135 ,  G11B11/105

CPC分类号： G11B7/1353 ,  G11B11/10532 ,  G11B11/10536 ,  G11B11/10554 ,  G11B7/124 ,  G11B11/1058 ,  G11B2007/13722

摘要： A photomagnetic composite head comprising a magnetic head and an optical head that are integrated into one unit, an optical waveguide path of the optical head being located in the surface of the magnetic head that faces a recording medium, and a laser beam that passes through the optical waveguide path being irradiated on a point on the recording medium where a magnetic field is impressed from the magnetic head, whereby recording can be performed under a condition in which the coercivity of the recording medium has been lowered by the laser beam, thus making it possible to achieve high density recording by using a recording medium with a high coercivity.

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：US5643687A

公开(公告)日：1997-07-01

申请号：US358682

申请日：1994-12-19

申请人： Naoyasu Iketani ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Kenji Ohta

发明人： Naoyasu Iketani ,  Hiroyuki Katayama ,  Junichiro Nakayama ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B7/257 ,  G11B11/105 ,  G11B5/66

CPC分类号： G11B7/2578 ,  G11B11/10582 ,  G11B11/10584 ,  G11B11/10593 ,  G11B7/252 ,  G11B2007/24306 ,  G11B2007/25706 ,  G11B2007/2571 ,  G11B2007/25713 ,  G11B2007/25715 ,  G11B2007/25718 ,  G11B7/2531 ,  G11B7/2533 ,  G11B7/2534 ,  G11B7/2585 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/26 ,  Y10T428/265

摘要： A magneto-optic memory medium including a first dielectric layer having a first main surface and a second main surface; a second dielectric layer for covering the first main surface of the first dielectric layer; and a magneto-optic memory layer for covering the second dielectric layer. The first dielectric layer is formed of an oxide having a refractive index in the range of 2.4 or more and 3.5 or less, and the second dielectric layer is formed of a material containing no oxygen. The magneto-optic memory medium is produced by the steps of forming a first layer by performing reactive sputtering in an atmosphere of a first sputter gas using a material containing a first element as a target; switching the first sputter gas to a second sputter gas; forming a second layer on the first layer by performing reactive sputtering in an atmosphere of the second sputter gas using a material containing the first element as a target; and forming a magneto-optic memory layer on the second dielectric layer.

摘要翻译： 一种磁光存储介质，包括具有第一主表面和第二主表面的第一介电层; 第二电介质层，用于覆盖第一介电层的第一主表面; 以及用于覆盖第二介电层的磁光存储层。 第一电介质层由折射率在2.4以上且3.5以下的氧化物形成，第二电介质层由不含氧的材料形成。 磁光存储介质通过以下步骤制造：通过使用包含第一元素作为靶的材料在第一溅射气体的气氛中进行反应溅射来形成第一层; 将第一溅射气体切换到第二溅射气体; 通过使用包含第一元素作为目标的材料在第二溅射气体的气氛中进行反应溅射，在第一层上形成第二层; 以及在所述第二电介质层上形成磁光存储层。

公开(公告)号：US5530685A

公开(公告)日：1996-06-25

申请号：US330744

申请日：1994-10-28

申请人： Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi ,  Kenji Ohta

发明人： Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi ,  Kenji Ohta

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00

CPC分类号： G11B11/10554 ,  G11B11/10521 ,  G11B11/10523 ,  G11B11/10552

摘要： A magneto-optical recording apparatus of the present invention is provided with an objective lens for focusing a light beam onto a magneto-optical recording medium. A pair of magnets is disposed on opposite sides of the magneto-optical recording medium and apply a writing magnetic field onto a portion of the magneto-optical recording medium that has been irradiated by the light beam while applying an initializing magnetic field greater than the writing magnetic field onto a portion apart from that irradiated by the light beam.

摘要翻译： 本发明的磁光记录装置设置有用于将光束聚焦到磁光记录介质上的物镜。 一对磁体设置在磁光记录介质的相对侧上，并将写入磁场施加到已经被光束照射的磁光记录介质的一部分上，同时施加大于写入的初始化磁场 磁场到除了被光束照射的部分之外的部分。

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。