公开(公告)号：US07352658B2

公开(公告)日：2008-04-01

申请号：US10381315

申请日：2001-02-07

申请人： Katsusuke Shimazaki ,  Norio Ohta ,  Fumiyoshi Kirino

发明人： Katsusuke Shimazaki ,  Norio Ohta ,  Fumiyoshi Kirino

IPC分类号： G11B11/00

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/3909 ,  G11B5/3954 ,  G11B5/4886 ,  G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B5/86 ,  G11B11/10504 ,  G11B11/10554 ,  G11B11/1058 ,  G11B11/10584 ,  G11B11/10591 ,  G11B2005/0005 ,  G11B2005/001 ,  G11B2005/0021 ,  G11B2005/3996

摘要： A magnetic recording medium comprises a first magnetic film and a second magnetic film on a substrate. The second magnetic film is composed of a magnetic material preferred for recording and reproduction, and the first magnetic film is composed of a ferrimagnetic material excellent in thermal stability. Information is recorded in the second magnetic film by using a magnetic head. The first magnetic film is heated by being irradiated with a laser beam to lower coercivity, and the information in the second magnetic film is magnetically transferred to the first magnetic film. The recorded information is stabilized, because the first magnetic film is excellent in thermal stability. The magnetic recording medium is highly resistant to thermal fluctuation, and it has high reliability. A magnetic domain of about 0.1 μm, formed by magnetic recording at a super high density of 50 Gb/inch2, is successfully and stably allowed to exist.

摘要翻译： 磁记录介质包括在基板上的第一磁性膜和第二磁性膜。 第二磁性膜由优选用于记录和再现的磁性材料组成，第一磁性膜由热稳定性优异的亚铁磁性材料构成。 通过使用磁头将信息记录在第二磁性膜中。 通过用激光束照射第一磁性膜以降低矫顽力，并且将第二磁性膜中的信息磁性转移到第一磁性膜。 记录信息稳定，因为第一磁性膜的热稳定性优异。 磁记录介质对热波动具有很高的抵抗力，可靠性高。 通过以50Gb /英寸2的超高密度的磁记录形成的大约0.1μm的磁畴被成功且稳定地存在。

公开(公告)号：US06339583B1

公开(公告)日：2002-01-15

申请号：US09100111

申请日：1998-06-19

申请人： Hitoshi Watanabe ,  Yoshitane Tsuburaya ,  Katsusuke Shimazaki ,  Satoru Ohnuki ,  Norio Ohta

发明人： Hitoshi Watanabe ,  Yoshitane Tsuburaya ,  Katsusuke Shimazaki ,  Satoru Ohnuki ,  Norio Ohta

IPC分类号： G11B370

CPC分类号： G11B23/0306 ,  G11B23/0308

摘要： A plate spring is provided on a back surface of a shutter of a cartridge. When the shutter is closed, the plate spring presses a disk in a cartridge case against an inner wall surface of a lower case so that the disk is immovable in the case. When the shutter is open, the plate spring is retracted into a space between an inner surface of the shutter and a surface of an upper case. The disk is supported immovably and uniformly in the cartridge. Therefore, deformation such as warpage of the disk hardly occurs. Even when the cartridge is stored in any posture, it is possible to avoid deformation such as warpage and flexure of the disk in the cartridge during the storage.

摘要翻译： 板弹簧设置在盒的挡板的后表面上。 当快门关闭时，板簧将盒壳体中的盘压靠在下壳体的内壁表面上，使得盘不可移动到壳体中。 当快门打开时，板簧缩回到快门的内表面和上壳体的表面之间的空间中。 磁盘不可移动地均匀地支撑在磁带盒中。 因此，几乎不发生诸如盘的翘曲等变形。 即使当以任何姿势存储盒时，也可以避免储存期间盒中的盘的翘曲和弯曲等变形。

公开(公告)号：US06628574B1

公开(公告)日：2003-09-30

申请号：US09600030

申请日：2000-07-11

申请人： Katsusuke Shimazaki ,  Hitoshi Watanabe ,  Hiroyuki Awano ,  Masahumi Yoshihiro ,  Norio Ohta

发明人： Katsusuke Shimazaki ,  Hitoshi Watanabe ,  Hiroyuki Awano ,  Masahumi Yoshihiro ,  Norio Ohta

IPC分类号： G11B1100

CPC分类号： B82Y10/00 ,  G11B7/1372 ,  G11B7/24082 ,  G11B11/10515 ,  G11B11/10543 ,  G11B11/10554 ,  G11B11/1058 ,  G11B11/10584 ,  G11B11/10593

摘要： A reproducing apparatus for a magneto-optical recording medium has, at one end of a swing arm, a magneto-optical head provided with a slider and a solid immersion lens. A reproducing light beam-detecting system is installed to the other end of the swing arm. During reproduction on a magneto-optical recording medium, an alternating magnetic field is applied while radiating a reproducing light beam which is power-modulated to have a low power and a high power in synchronization with a reproducing clock. The reproducing light beam having the low power causes transfer of a magnetic domain in the information-recording layer to the reproducing layer and magnification thereof. The reproducing light beam having the high power extinguishes the magnified magnetic domain. Minute magnetic domains can be individually reproduced at high C/N.

摘要翻译： 用于磁光记录介质的再现装置在摆臂的一端具有设置有滑块和固体浸没透镜的磁光头。 再现光束检测系统安装在摆臂的另一端。 在磁光记录介质的再现期间，施加交变磁场，同时以与再现时钟同步的方式辐射被功率调制为具有低功率和高功率的再现光束。 具有低功率的再现光束使得信息记录层中的磁畴传输到再现层及其放大倍率。 具有高功率的再现光束消除了放大的磁畴。 分钟磁畴可以高C / N单独再现。

公开(公告)号：US06501729B2

公开(公告)日：2002-12-31

申请号：US10000400

申请日：2001-12-04

申请人： Hitoshi Watanabe ,  Yoshitane Tsuburaya ,  Katsusuke Shimazaki ,  Satoru Ohnuki ,  Norio Ohta

发明人： Hitoshi Watanabe ,  Yoshitane Tsuburaya ,  Katsusuke Shimazaki ,  Satoru Ohnuki ,  Norio Ohta

IPC分类号： G11B370

CPC分类号： G11B23/0306 ,  G11B23/0308

摘要： A plate spring is provided on a back surface of a shutter of a cartridge. When the shutter is closed, the plate spring presses a disk in a cartridge case against an inner wall surface of a lower case so that the disk is immovable in the case. When the shutter is open, the plate spring is retracted into a space between an inner surface of the shutter and a surface of an upper case. The disk is supported immovably and uniformly in the cartridge. Therefore, deformation such as warpage of the disk hardly occurs. Even when the cartridge is stored in any posture, it is possible to avoid deformation such as warpage and flexure of the disk in the cartridge during the storage.

摘要翻译： 板弹簧设置在盒的挡板的后表面上。 当快门关闭时，板簧将盒壳体中的盘压靠在下壳体的内壁表面上，使得盘不可移动到壳体中。 当快门打开时，板簧缩回到快门的内表面和上壳体的表面之间的空间中。 磁盘不可移动地均匀地支撑在磁带盒中。 因此，几乎不发生诸如盘的翘曲等变形。 即使当以任何姿势存储盒时，也可以避免储存期间盒中的盘的翘曲和弯曲等变形。

公开(公告)号：US5783320A

公开(公告)日：1998-07-21

申请号：US781711

申请日：1997-01-10

申请人： Katsusuke Shimazaki ,  Satoru Ohnuki ,  Masatoshi Hashimoto ,  Yoshinori Shirai ,  Norio Ohta ,  Hideo Fujiwara ,  Masafumi Yoshihiro ,  Yukinori Yamada ,  Eiji Koyama ,  Hitoshi Furusho

发明人： Katsusuke Shimazaki ,  Satoru Ohnuki ,  Masatoshi Hashimoto ,  Yoshinori Shirai ,  Norio Ohta ,  Hideo Fujiwara ,  Masafumi Yoshihiro ,  Yukinori Yamada ,  Eiji Koyama ,  Hitoshi Furusho

IPC分类号： G11B7/26 ,  G11B11/105 ,  G11B5/66

CPC分类号： G11B11/10591 ,  G11B11/10584 ,  G11B11/10586 ,  G11B11/10589 ,  G11B7/26 ,  Y10S428/90 ,  Y10T428/12771 ,  Y10T428/12931

摘要： Disclosed is a magneto-optical recording medium which comprises a transparent substrate and, provided on the substrate, a magneto-optical recording film comprising a perpendicular magnetic film based on rare earth metal-transition metal and an auxiliary magnetic film having spontaneous magnetization which exerts, between itself and the magneto-optical recording film, an exchange coupling force on each other and in which the auxiliary magnetic film used is a magnetic film which readily rotates its magnetization direction toward the external magnetic field in the neighborhood of the Curie temperature of the magneto-optical recording film and has a squareness ratio of not more than 1 in the neighborhood of the Curie temperature, and a process for producing the magneto-optical recording medium.

摘要翻译： 公开了一种磁光记录介质，其包括透明基板，并且在基板上设置包括基于稀土金属 - 过渡金属的垂直磁性膜和具有自发磁化的辅助磁膜的磁光记录膜， 在它们自身和磁光记录膜之间，彼此之间的交换耦合力，并且其中使用的辅助磁膜是磁性薄膜，其容易地使其磁化方向在磁光的居里温度附近的外部磁场旋转 - 光学记录膜，并且在居里温度附近具有不大于1的矩形比率，以及用于制造磁光记录介质的工艺。

公开(公告)号：US07113453B1

公开(公告)日：2006-09-26

申请号：US09321795

申请日：1999-05-28

申请人： Katsusuke Shimazaki ,  Norio Ohta ,  Akiyoshi Ito ,  Katsuji Nakagawa ,  Kazuko Inoue

发明人： Katsusuke Shimazaki ,  Norio Ohta ,  Akiyoshi Ito ,  Katsuji Nakagawa ,  Kazuko Inoue

IPC分类号： G11B11/00 ,  G11B7/24

CPC分类号： G11B11/10508 ,  G11B11/10515 ,  G11B11/10586

摘要： A magneto-optical recording medium and a method for recording and reproduction thereon are provided in order to reproduce information recorded by multi-valued recording at a high S/N ratio. Disclosed is a magneto-optical recording medium including two magnetic layers capable of four-valued recording based on four combined magnetization states. Magnitudes of reproduction signals concerning the four magnetization states, obtained upon reproduction at a wavelength λ1, are different from those obtained upon reproduction at a wavelength λ2. The two magnetic layers, on which a signal (a) is recorded, are irradiated with light beams having the wavelengths λ1 and λ2 respectively. Signals (d), (e) reproduced from respective reflected light beams are sliced by using at least one slice level to obtain two-valued or higher multi-valued reproduction signals respectively. The two-valued or higher multi-valued reproduction signals (f), (g) from the respective wavelengths are mutually subjected to logical operation to reproduce recorded information (i).

摘要翻译： 提供磁光记录介质及其上的记录和再现方法，以便以高S / N比再现通过多值记录记录的信息。 公开了一种包括基于四个组合磁化状态能够进行四值记录的两个磁性层的磁光记录介质。 在波长λ1 1再现时获得的关于四个磁化状态的再现信号的幅度与在波长λ2 2再现时获得的重现信号的大小不同。 在其上记录有信号（a）的两个磁性层分别用波长λ1和λ2的光束照射。 通过使用至少一个限幅电平对从各反射光束再现的信号（d），（e）进行分片，以分别获得二值或更高的多值再现信号。 来自各个波长的两值或更高的多值再生信号（f），（g））相互进行逻辑运算以再现记录信息（i）。

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：US6122228A

公开(公告)日：2000-09-19

申请号：US141305

申请日：1998-08-27

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： G11B11/105 ,  G11B13/04 ,  G11B11/00

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：US5923625A

公开(公告)日：1999-07-13

申请号：US981308

申请日：1997-12-16

申请人： Katsusuke Shimazaki ,  Norio Ohta ,  Akiyoshi Ito ,  Katsuji Nakagawa ,  Kazuko Inoue

发明人： Katsusuke Shimazaki ,  Norio Ohta ,  Akiyoshi Ito ,  Katsuji Nakagawa ,  Kazuko Inoue

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

CPC分类号： G11B11/10508 ,  G11B11/10515 ,  G11B11/10586

摘要： A magneto-optical recording medium and a method for recording and reproduction thereon are provided in order to reproduce information recorded by multi-valued recording at a high S/N ratio. Disclosed is a magneto-optical recording medium including two magnetic layers capable of four-valued recording based on four combined magnetization states. Magnitudes of reproduction signals concerning the four magnetization states, obtained upon reproduction at a wavelength .lambda..sub.1, are different from those obtained upon reproduction at a wavelength .lambda..sub.2. The two magnetic layers, on which a signal (a) is recorded, are irradiated with light beams having the wavelengths .lambda..sub.1 and .lambda..sub.2 respectively. Signals (d), (e) reproduced from respective reflected light beams are sliced by using at least one slice level to obtain two-valued or higher multi-valued reproduction signals respectively. The two-valued or higher multi-valued reproduction signals (f), (g) from the respective wavelengths are mutually subjected to logical operation to reproduce recorded information (i).

摘要翻译： PCT No.PCT / JP96 / 01938 Sec。 371日期：1997年12月16日 102（e）日期1997年12月16日PCT提交1996年7月12日PCT公布。 公开号WO97 / 03439 日期1997年1月30日提供磁光记录介质及其上的记录和再现方法，以便以高S / N比再现由多值记录记录的信息。 公开了一种包括基于四个组合磁化状态能够进行四值记录的两个磁性层的磁光记录介质。 关于在波长λ1再现时获得的四种磁化状态的再现信号的幅度与在波长λ2再现时获得的不同。将记录有信号（a）的两个磁性层照射 分别具有波长λ1和λ2的光束。 通过使用至少一个限幅电平对从各反射光束再现的信号（d），（e）进行分片，以分别获得二值或更高的多值再现信号。 来自各个波长的两值或更高的多值再生信号（f），（g））相互进行逻辑运算以再现记录信息（i）。