公开(公告)号：US07110327B2

公开(公告)日：2006-09-19

申请号：US10200289

申请日：2002-07-23

申请人： Hiroki Takao ,  Yuji Yamazaki ,  Susumu Imai ,  Hiroyuki Awano ,  Katsusuke Shimazaki

发明人： Hiroki Takao ,  Yuji Yamazaki ,  Susumu Imai ,  Hiroyuki Awano ,  Katsusuke Shimazaki

IPC分类号： G11B11/00 ,  G11B5/66

CPC分类号： B82Y10/00 ,  G11B5/012 ,  G11B5/10 ,  G11B5/127 ,  G11B5/1278 ,  G11B5/40 ,  G11B5/488 ,  G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  Y10S428/90 ,  Y10T428/12611

摘要： A magnetic recording medium comprises, on a substrate, a recording auxiliary layer, a recording holding layer, recording control layer, and a recording layer. The recording layer is constructed by using a ferri-magnetic material having perpendicular magnetization. The data can be recorded at a super high density by using the recording and reproducing head of the present invention, because the recording layer has the perpendicular magnetization. The disappearance of data, which would be otherwise caused by the thermomagnetic relaxation phenomenon, is suppressed after recording the data, because the recording layer has large coercive force at the room temperature. The data, which is recorded at the super high density on the magnetic recording medium, can be reproduced by using a magnetic resistance element carried on the recording and reproducing head.

摘要翻译： 磁记录介质在基板上包括记录辅助层，记录保持层，记录控制层和记录层。 记录层通过使用具有垂直磁化强度的铁磁材料构成。 由于记录层具有垂直磁化强度，所以通过使用本发明的记录和再现头可以以超高密度记录数据。 由于记录层在室温下具有较大的矫顽力，所以在记录数据之后，由于热磁性松弛现象而导致的数据的消失被抑制。 可以通过使用在记录和再现头上携带的磁阻元件来再现在磁记录介质上以超高密度记录的数据。

公开(公告)号：US06455174B1

公开(公告)日：2002-09-24

申请号：US09433020

申请日：1999-11-03

申请人： Hiroki Takao ,  Yuji Yamazaki ,  Susumu Imai ,  Hiroyuki Awano ,  Katsusuke Shimazaki

发明人： Hiroki Takao ,  Yuji Yamazaki ,  Susumu Imai ,  Hiroyuki Awano ,  Katsusuke Shimazaki

IPC分类号： G11B566

CPC分类号： B82Y10/00 ,  G11B5/012 ,  G11B5/10 ,  G11B5/127 ,  G11B5/1278 ,  G11B5/40 ,  G11B5/488 ,  G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  Y10S428/90 ,  Y10T428/12611

摘要： A magnetic recording medium comprises, on a substrate, a recording auxiliary layer, a recording holding layer, recording control layer, and a recording layer. The recording layer is constructed by using a ferri-magnetic material having perpendicular magnetization. The data can be recorded at a super high density by using the recording and reproducing head of the present invention, because the recording layer has the perpendicular magnetization. The disappearance of data, which would be otherwise caused by the thermomagnetic relaxation phenomenon, is suppressed after recording the data, because the recording layer has large coercive force at the room temperature. The data, which is recorded at the super high density on the magnetic recording medium, can be reproduced by using a magnetic resistance element carried on the recording and reproducing head.

公开(公告)号：US06693854B2

公开(公告)日：2004-02-17

申请号：US10388397

申请日：2003-03-17

申请人： Katsusuke Shimazaki ,  Susumu Imai ,  Norio Ohta ,  Hiroyuki Awano ,  Masafumi Yoshihiro ,  Hitoshi Watanabe ,  Hiroki Takao

发明人： Katsusuke Shimazaki ,  Susumu Imai ,  Norio Ohta ,  Hiroyuki Awano ,  Masafumi Yoshihiro ,  Hitoshi Watanabe ,  Hiroki Takao

IPC分类号： G11B1100

CPC分类号： G11B11/10595 ,  G11B11/10513 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/10584 ,  G11B11/10593 ,  G11B20/00086 ,  G11B20/1217 ,  G11B2020/1275 ,  G11B2020/1298 ,  G11B2220/2525

摘要： External magnetic fields H(x) or reproducing light beams L(x) having different intensity patterns are applied to an identical recording position on a magneto-optical recording medium so that different pieces of information corresponding to the patterns are reproduced from the identical recording position. A function H(x) or L(x) is a password for obtaining the information. Only a person, who knows the function, can access specified information recorded on the magneto-optical recording medium. The function H(x) or L(x) is a function in which the magnetic field intensity or the light intensity is modulated with respect to the recording position x so that magnetic domains may be thinned out to perform reproduction at a specified cycle from continuous magnetic domains in a recording area. Other than the use for the purpose of security, reproduced C/N can be remarkably improved by performing reproduction n times while radiating a reproducing light beam PL/PH which is power-modulated so that the high power PH is applied at every cycle which is not less than n times the recording clock, to a specified magneto-optical recording medium capable of magnetic domain-magnifying reproduction.

摘要翻译： 具有不同强度图案的外部磁场H（x）或再现光束L（x）被施加到磁光记录介质上相同的记录位置，使得与图案对应的不同的信息从相同的记录位置再现 。 函数H（x）或L（x）是用于获取信息的密码。 知道该功能的人只能访问记录在磁光记录介质上的指定信息。 函数H（x）或L（x）是其中相对于记录位置x调制磁场强度或光强度的功能，使得磁畴可以被稀疏以在连续的指定周期进行再现 记录区域的磁畴。 除了用于安全性的用途之外，通过执行再现n次，可以显着提高再现的C / N，同时辐射被功率调制的再现光束PL / PH，使得在每个周期都应用高功率PH 不小于n倍的记录时钟，到能够进行磁畴放大再现的指定磁光记录介质。

公开(公告)号：US06556516B1

公开(公告)日：2003-04-29

申请号：US09242907

申请日：1999-03-22

申请人： Katsusuke Shimazaki ,  Susumu Imai ,  Norio Ohta ,  Hiroyuki Awano ,  Masafumi Yoshihiro ,  Hitoshi Watanabe ,  Hiroki Takao

发明人： Katsusuke Shimazaki ,  Susumu Imai ,  Norio Ohta ,  Hiroyuki Awano ,  Masafumi Yoshihiro ,  Hitoshi Watanabe ,  Hiroki Takao

IPC分类号： G11B1100

CPC分类号： G11B11/10595 ,  G11B11/10513 ,  G11B11/10515 ,  G11B11/10528 ,  G11B11/10584 ,  G11B11/10593 ,  G11B20/00086 ,  G11B20/1217 ,  G11B2020/1275 ,  G11B2020/1298 ,  G11B2220/2525

摘要： External magnetic fields H(x) or reproducing light beams L(x) having different intensity patterns are applied to an identical recording position on a magneto-optical recording medium so that different pieces of information corresponding to the patterns are reproduced from the identical recording position. A function H(x) or L(x) is a password for obtaining the information. Only a person, who knows the function, can access specified information recorded on the magneto-optical recording medium. The function H(x) or L(x) is a function in which the magnetic field intensity or the light intensity is modulated with respect to the recording position x so that magnetic domains may be thinned out to perform reproduction at a specified cycle from continuous magnetic domains in a recording area. Other than the use for the purpose of security, reproduced C/N can be remarkably improved by performing reproduction n times while radiating a reproducing light beam PL/PH which is power-modulated so that the high power PH is applied at every cycle which is not less than n times the recording clock, to a specified magneto-optical recording medium capable of magnetic domain-magnifying reproduction.

摘要翻译： 具有不同强度图案的外部磁场H（x）或再现光束L（x）被施加到磁光记录介质上相同的记录位置，使得与图案对应的不同的信息从相同的记录位置再现 。 函数H（x）或L（x）是用于获取信息的密码。 知道该功能的人只能访问记录在磁光记录介质上的指定信息。 函数H（x）或L（x）是其中相对于记录位置x调制磁场强度或光强度的功能，使得磁畴可以被稀疏以在连续的指定周期进行再现 记录区域的磁畴。 除了用于安全性的用途之外，通过执行再现n次，可以显着提高再现的C / N，同时辐射被功率调制的再现光束PL / PH，使得在每个周期都应用高功率PH 不小于n倍的记录时钟，到能够进行磁畴放大再现的指定磁光记录介质。

公开(公告)号：US06904002B2

公开(公告)日：2005-06-07

申请号：US10452043

申请日：2003-06-03

申请人： Hiroyuki Awano ,  Katsusuke Shimazaki ,  Hiroki Takao ,  Norio Ohta ,  Akiyoshi Itou ,  Katsuji Nakagawa

发明人： Hiroyuki Awano ,  Katsusuke Shimazaki ,  Hiroki Takao ,  Norio Ohta ,  Akiyoshi Itou ,  Katsuji Nakagawa

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

CPC分类号： G11B11/10515 ,  G11B11/10528 ,  G11B11/10584 ,  G11B11/10586 ,  G11B11/10595

摘要： A magneto-optical recording medium has magneto-optical recording layers (11, 12, 13) and reproducing layers (21, 22, 23). The information recorded in the reproducing layers are reproduced by means of reproducing light beams (31, 32, 33) of different wavelengths, respectively. In reproduction, magnetic domains (4) recorded in the recording layers are transferred in the reproducing layers formed on the respective recording layers, the transferred magnetic domains (5) are enlarged with an external magnetic field, and the information is reproduced. Since information is recorded and reproduced for each recording layer, the recording density is improved. Further since the reproduction signals are amplified by the magnetic domain enlargement, the C/N is improved.

摘要翻译： 磁光记录介质具有磁光记录层（11,12,13）和再现层（21,22,23）。 记录在再现层中的信息分别通过再现不同波长的光束（31,32,33）来再现。 在再现中，记录在记录层中的磁畴（4）被传送到形成在各个记录层上的再现层中，所传送的磁畴（5）被外部磁场扩大，并且再现信息。 由于为每个记录层记录和再现信息，因此提高了记录密度。 此外，由于通过磁畴放大来放大再现信号，所以提高了C / N。

公开(公告)号：US06633514B1

公开(公告)日：2003-10-14

申请号：US09601196

申请日：2000-08-16

申请人： Hiroyuki Awano ,  Katsusuke Shimazaki ,  Hiroki Takao ,  Norio Ohta ,  Akiyoshi Itou ,  Katsuji Nakagawa

发明人： Hiroyuki Awano ,  Katsusuke Shimazaki ,  Hiroki Takao ,  Norio Ohta ,  Akiyoshi Itou ,  Katsuji Nakagawa

IPC分类号： G11B1100

CPC分类号： G11B11/10515 ,  G11B11/10528 ,  G11B11/10584 ,  G11B11/10586 ,  G11B11/10595

摘要： A magneto-optical recording medium has magneto-optical recording layers (11, 12, 13) and reproducing layers (21, 22, 23). The information recorded in the reproducing layers are reproduced by means of reproducing light beams (31, 32, 33) of different wavelengths, respectively. In reproduction, magnetic domains (4) recorded in the recording layers are transferred in the reproducing layers formed on the respective recording layers, the transferred magnetic domains (5) are enlarged with an external magnetic field, and the information is reproduced. Since information is recorded and reproduced for each recording layer, the recording density is improved. Further since the reproduction signals are amplified by the magnetic domain enlargement, the C/N is improved.

摘要翻译： 磁光记录介质具有磁光记录层（ 11,12,13，）和再现层（ 21,22,23 ）。 记录在再现层中的信息分别通过再现不同波长的光束（ 31,32,33 ）来再现。 在再现中，记录在记录层中的磁畴（ 4 PDAT>）被传送到形成在各个记录层上的再现层中，转移的磁畴（ 5 ）用外部磁场放大，信息被再现。 由于为每个记录层记录和再现信息，因此提高了记录密度。 此外，由于再现信号被磁畴放大放大，因此C / N得到改善

公开(公告)号：US06388954B1

公开(公告)日：2002-05-14

申请号：US09280811

申请日：1999-03-30

申请人： Hiroyuki Awano ,  Katsusuke Shimazaki ,  Hiroki Takao ,  Norio Ohta ,  Akiyoshi Itou ,  Katsuji Nakagawa ,  Manabu Tani ,  Masafumi Yoshihiro ,  Masaki Sekine

发明人： Hiroyuki Awano ,  Katsusuke Shimazaki ,  Hiroki Takao ,  Norio Ohta ,  Akiyoshi Itou ,  Katsuji Nakagawa ,  Manabu Tani ,  Masafumi Yoshihiro ,  Masaki Sekine

IPC分类号： G11B1100

CPC分类号： G11B7/1275 ,  G11B11/10515 ,  G11B11/10543

摘要： The magneto-optical recording medium has a magnetic domain magnification reproducing layer and an information recording layer. Clock marks are formed on the information recording layer, making it possible to generate a reproducing clock on the basis of these. The clock marks are detected either by irradiating directly with light of wavelength &lgr;2(&lgr;1≠&lgr;2), being different from the light of wavelength &lgr;1 which is used for reproducing the recording marks, or by applying a direct-current magnetic field, transferring and enlarging the clock marks on to the magnetic domain magnification reproducing layer, and detecting the reproduction signals from this magnetic domain magnification reproducing layer. Since the reproducing clock is in exact synchronisation with the recording marks, it is eminently suitable as a clock for pulse-modulated reproducing light and reproducing magnetic fields used when reproducing the reproducing layer.

摘要翻译： 磁光记录介质具有磁畴倍率再现层和信息记录层。 在信息记录层上形成时钟标记，从而可以基于这些生成再现时钟。 通过直接照射波长为lambd2（lambd1> lambd2）的光，不同于用于再现记录标记的波长lambd1的光，或通过施加直流磁场，转印和 将时钟标记放大到磁畴倍率再现层，并检测来自该磁畴倍率再现层的再现信号。 由于再现时钟与记录标记完全同步，所以它非常适合用作脉冲调制再现光的时钟并且再现再生层时使用的再现磁场。

公开(公告)号：US06671233B1

公开(公告)日：2003-12-30

申请号：US09625278

申请日：2000-07-25

申请人： Katsusuke Shimazaki ,  Yoshitane Tsuburaya ,  Norio Ohta ,  Hitoshi Watanabe ,  Hiroki Takao

发明人： Katsusuke Shimazaki ,  Yoshitane Tsuburaya ,  Norio Ohta ,  Hitoshi Watanabe ,  Hiroki Takao

IPC分类号： G11B1100

CPC分类号： G11B11/10515 ,  G11B11/10593 ,  G11B11/10595

摘要： A magneto-optical recording medium comprises, on a substrate, a dielectric layer, a GdFeCo reproducing layer, a non-magnetic layer, and a TbFeCo recording layer. Upon reproduction, a DC magnetic field Hex is applied in the recording direction, and a reproducing light beam is radiated while being modulated to have a low power and a high power in synchronization with a reproducing clock. The reproducing layer is a magnetic film which changes from in-plane magnetization into perpendicular magnetization at a critical temperature Tcr, which has a compensation temperature Tcomp between room temperature and a Curie temperature Tc, and which satisfies Troom

摘要翻译： 磁光记录介质在基板上包括电介质层，GdFeCo再现层，非磁性层和TbFeCo记录层。 在再现时，在记录方向上施加DC磁场Hex，并且在再现时钟同步的同时，将被再调制的再现光束照射成具有低功率和高功率。 再现层是在室温和居里温度Tc之间具有补偿温度Tcomp的临界温度Tcr从平面内磁化转变为垂直磁化的磁性膜，其满足Troom

公开(公告)号：US06385140B2

公开(公告)日：2002-05-07

申请号：US09799602

申请日：2001-03-07

申请人： Satoru Ohnuki ,  Norio Ohta ,  Katsusuke Shimazaki ,  Masafumi Yoshihiro ,  Hiroki Takao ,  Hitoshi Watanabe

发明人： Satoru Ohnuki ,  Norio Ohta ,  Katsusuke Shimazaki ,  Masafumi Yoshihiro ,  Hiroki Takao ,  Hitoshi Watanabe

IPC分类号： G11B1100

CPC分类号： G11B11/10515 ,  G11B11/10584 ,  G11B11/10593

摘要： A magneto-optic recording medium includes a second auxiliary magnetic film, a first auxiliary magnetic film and a magneto-optic recording film on a substrate. The auxiliary magnetic films change from in-plane magnetization to vertical magnetization at critical temperatures TCR1 and TCR2. Since they have the relation TCR1>TCR2, the magnetic domain transferred from the magneto-optic recording film to the first auxiliary magnetic film at the time of reproduction is expanded in diameter and is transferred to the second auxiliary magnetic film when the temperature profiles of the auxiliary magnetic films inside an optical spot are utilized. The magnetic domain of the magneto-optic recording film can be expanded and transferred, too, by means of magnetostatic coupling by using a non-magnetic film in place of the first auxiliary magnetic film. Pulse reproduction light subjected to power modulation in synchronism with a reproduction clock can be used at the time of reproduction. Even when a very small magnetic domain is recorded, the intensity of an amplified reproduction signal can be detected and excellent C/N can be obtained.

摘要翻译： 磁光记录介质包括在基板上的第二辅助磁膜，第一辅助磁膜和磁光记录膜。 在临界温度TCR1和TCR2下，辅助磁膜从面内磁化转变为垂直磁化。 由于它们具有关系TCR1> TCR2，所以在再现时从磁光记录膜转移到第一辅助磁性膜的磁畴的直径扩大并且当第二辅助磁性膜的温度分布 利用光点内的辅助磁膜。 磁光记录膜的磁畴也可以通过使用非磁性膜代替第一辅助磁性膜的静磁耦合来扩展和转移。 在再现时可以使用经受与再现时钟同步的功率调制的脉冲再现光。 即使记录非常小的磁畴，也可以检测出放大的再现信号的强度，可以获得优异的C / N。

公开(公告)号：US06226234B1

公开(公告)日：2001-05-01

申请号：US09091480

申请日：1998-06-19

申请人： Satoru Ohnuki ,  Norio Ohta ,  Katsusuke Shimazaki ,  Masafumi Yoshihiro ,  Hiroki Takao ,  Hitoshi Watanabe

发明人： Satoru Ohnuki ,  Norio Ohta ,  Katsusuke Shimazaki ,  Masafumi Yoshihiro ,  Hiroki Takao ,  Hitoshi Watanabe

IPC分类号： G11B1100

CPC分类号： G11B11/10515 ,  G11B11/10584 ,  G11B11/10593

摘要： A magneto-optic recording medium includes a second auxiliary magnetic film, a first auxiliary magnetic film and a magneto-optic recording film on a substrate. The auxiliary magnetic films change from in-plane magnetization to vertical magnetization at critical temperatures TCR1 and TCR2. Since they have the relation TCR1>TCR2, the magnetic domain transferred from the magneto-optic recording film to the first auxiliary magnetic film at the time of reproduction is expanded in diameter and is transferred to the second auxiliary magnetic film when the temperature profiles of the auxiliary magnetic films inside an optical spot are utilized. The magnetic domain of the magneto-optic recording film can be expanded and transferred, too, by means of magnetostatic coupling by using a non-magnetic film in place of the first auxiliary magnetic film. Pulse reproduction light subjected to power modulation in synchronism with a reproduction clock can be used at the time of reproduction. Even when a very small magnetic domain is recorded, the intensity of an amplified reproduction signal can be detected and excellent C/N can be obtained.

摘要翻译： 磁光记录介质包括在基板上的第二辅助磁膜，第一辅助磁膜和磁光记录膜。 在临界温度TCR1和TCR2下，辅助磁膜从面内磁化转变为垂直磁化。 由于它们具有关系TCR1> TCR2，所以在再现时从磁光记录膜转移到第一辅助磁性膜的磁畴的直径扩大并且当第二辅助磁性膜的温度分布 利用光点内的辅助磁膜。 磁光记录膜的磁畴也可以通过使用非磁性膜代替第一辅助磁性膜的静磁耦合来扩展和转移。 在再现时可以使用经受与再现时钟同步的功率调制的脉冲再现光。 即使记录非常小的磁畴，也可以检测出放大的再现信号的强度，可以获得优异的C / N。