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公开(公告)号：US5707727A
公开(公告)日：1998-01-13
申请号：US395165
申请日：1995-02-27
申请人： Akira Takahashi , Yoshiteru Murakami , Junsaku Nakajima , Kenji Ohta , Junichiro Nakayama , Hiroyuki Katayama , Michinobu Mieda
发明人： Akira Takahashi , Yoshiteru Murakami , Junsaku Nakajima , Kenji Ohta , Junichiro Nakayama , Hiroyuki Katayama , Michinobu Mieda
CPC分类号： G11B11/10593 , G11B11/10506 , G11B11/10515 , G11B11/10517 , G11B11/10586 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： A magneto-optical recording medium has a recording layer whereon information is magneto-optically recorded. A readout layer is provided on the recording layer. The readout layer has a compensating temperature that is located between room temperature and the Curie temperature. In the readout layer, upon an application of a light beam, the in-plane magnetization occurs at room temperature and a transition from the in-plane magnetization to vertical magnetization occurs as the temperature of the irradiated area of the readout layer rises above a predetermined temperature. By employing this magneto-optical recording medium, with an application of a light beam that is intensity modulated into two levels, only a spot having a temperature not less than a predetermined temperature is involved in the reproduction; therefore, a recorded bit with a size smaller than the diameter of the light beam can be reproduced, thereby greatly increasing the recording density. Further, the level of the reproduced signals is increased, and crosstalk from the adjoining tracks is reduced; thus, information recording and overwriting can be conducted more easily.
摘要翻译： 磁光记录介质具有磁信息记录信息的记录层。 读出层设置在记录层上。 读出层具有位于室温和居里温度之间的补偿温度。 在读出层中，在施加光束时，在室温下发生平面内磁化，并且随着读出层的照射区域的温度上升到预定值以上，从面内磁化向垂直磁化的转变发生 温度。 通过采用该磁光记录介质，通过施加强度调制为两个级别的光束，只有具有不低于预定温度的温度的点参与再现; 因此，可以再现具有小于光束直径的尺寸的记录位，从而大大提高记录密度。 此外，再现信号的电平增加，并且来自相邻轨道的串扰减小; 因此，可以更容易地进行信息记录和重写。
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32.发明授权
公开(公告)号：US5635296A
公开(公告)日：1997-06-03
申请号：US260095
申请日：1994-06-15
IPC分类号： G11B11/10 , G11B11/105 , G11B5/66
CPC分类号： G11B11/10506 , G11B11/10523 , G11B11/10586 , 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. The first magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The second magnetic layer has its Curie temperature higher than that of the first magnetic layer, and coercive force thereof at room temperature is nearly zero. The third magnetic layer has a perpendicular magnetization in a temperature range between room temperature and its Curie temperature. The Curie temperature of the third magnetic layer is higher than the Curie temperature of the first magnetic layer. The coercive force of the third magnetic layer at room temperature is lower than that of the first magnetic layer. The compensation temperature of the third magnetic layer is higher than that of the second magnetic layer. Having the above arrangement, an overwriting is permitted on the magneto-optical recording medium, and an initializing magnetic field and a recording magnetic field in a magneto-optical recording and reproducing device are set in the same direction.
摘要翻译： 磁光记录介质包括分别由稀土 - 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。 第二磁性层的居里温度高于第一磁性层，其室温下的矫顽力几乎为零。 第三磁性层在室温与其居里温度之间的温度范围内具有垂直磁化强度。 第三磁性层的居里温度高于第一磁性层的居里温度。 室温下第三磁性层的矫顽力低于第一磁性层的矫顽力。 第三磁性层的补偿温度高于第二磁性层的补偿温度。 具有上述结构，在磁光记录介质上允许重写，磁光记录和再现装置中的初始化磁场和记录磁场被设置在相同的方向上。
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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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公开(公告)号：US5991259A
公开(公告)日：1999-11-23
申请号：US886299
申请日：1997-07-01
CPC分类号： G11B27/3027 , G11B27/19 , G11B7/24082 , G11B7/0938
摘要： An optical disk substrate in which a winding groove, which is winding in accordance with address information, and a normal groove, which is not winding, are placed alternately in the radial direction as tracking guides used for tracking control. With respect to this optical disk substrate, a laser beam, which is used for forming patterns for the tracking guides, is applied while being switched alternately between the first mode that exerts oscillations in the disk radial direction in accordance with the address information and the second mode that does not exert oscillations. An optical disk has a construction in which at least a recording layer is formed on the optical disk substrate.
摘要翻译： 根据地址信息卷绕卷绕槽的光盘基板和不卷绕的法线槽作为用于跟踪控制的跟踪引导件，沿径向交替放置。 相对于该光盘基板，在根据地址信息在盘径向施加振荡的第一模式和第二模式之间交替地切换用于形成用于跟踪引导件的图案的激光束 不发生振荡的模式。 光盘具有至少在光盘基板上形成记录层的结构。
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公开(公告)号：US5719831A
公开(公告)日：1998-02-17
申请号：US768794
申请日：1996-12-18
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。
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公开(公告)号：US5665467A
公开(公告)日：1997-09-09
申请号：US196978
申请日：1994-02-15
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。
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37.发明授权
公开(公告)号：US5615180A
公开(公告)日：1997-03-25
申请号：US198620
申请日：1994-02-18
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。
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38.发明授权
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.
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39.发明授权Magneto-optical recording medium comprising first, second and third magnetic layers and method of recording on same 失效包括第一，第二和第三磁性层的磁光记录介质及其记录方法
公开(公告)号：US5428585A
公开(公告)日：1995-06-27
申请号：US102349
申请日：1993-08-05
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。
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40.发明授权公开(公告)号：US06665235B2
公开(公告)日：2003-12-16
申请号：US10214881
申请日：2002-08-08
申请人： Yoshiteru Murakami , Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta , Naoyasu Iketani
发明人： Yoshiteru Murakami , Junji Hirokane , Junichiro Nakayama , Junsaku Nakajima , Akira Takahashi , Kenji Ohta , Naoyasu Iketani
IPC分类号： G11B1100
CPC分类号： G11B11/10586 , B60T1/005 , F16D63/00 , G11B7/00718 , G11B7/126 , G11B11/10506 , G11B11/10515 , G11B11/10517 , G11B11/10543 , G11B11/10595
摘要： Featured is a recording and reproducing method of a magneto-optical recording medium including a recording layer for recording thereon information magneto-optically and a readout layer which has in-plane magnetization at room temperature and where a transition occurs from in-plane magnetization to perpendicular magnetization as temperature raises. The method includes projecting a light beam onto such a magneto-optical recording medium so as to form a perpendicularly magnetized area in the readout layer by duplication of the magnetization of said recording layer to the area. In further embodiments, the recording medium further includes an intermediate layer made of non-magnetic film formed between the readout and recording layers and the readout and recording layers are composed of rare-earth transition metal alloys such as TbFeCo (recoding layer) readout layer, made of GdFeCo (readout layer).
摘要翻译： 特别是磁光记录介质的记录和再现方法，其包括用于在其上记录磁光信息的记录层和在室温下具有面内磁化的读出层，并且其中从面内磁化转变为垂直 磁化随温度升高。 该方法包括将光束投影到这种磁光记录介质上，以便通过将所述记录层的磁化复制到该区域而在读出层中形成垂直磁化区域。 在另外的实施例中，记录介质还包括由读出和记录层之间形成的非磁性膜制成的中间层，并且读出和记录层由稀土过渡金属合金如TbFeCo（记录层）读出层， 由GdFeCo（读出层）制成。
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