公开(公告)号：US5657299A

公开(公告)日：1997-08-12

申请号：US588629

申请日：1996-01-19

申请人： Junsaku Nakajima ,  Yoshiteru Murakami ,  Akira Takahashi

发明人： Junsaku Nakajima ,  Yoshiteru Murakami ,  Akira Takahashi

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B11/00 ,  G11B5/66

CPC分类号： G11B11/10593

摘要： A magneto-optical recording medium has magnetic multi-layers including a reproductive layer, which is a magnetic layer having perpendicular magnetic anisotropy, for reading out magneto-optically recorded information and a recording layer, which is a magnetic layer having perpendicular magnetic anisotropy, for magneto-optically recording information. In the magneto-optical recording medium, the following conditions are fulfilled:H.sub.C1 (ta)+.sigma.w(ta)/2M.sub.S1 (ta)h.sub.1

摘要翻译： 磁光记录介质具有磁性多层，包括作为具有垂直磁各向异性的磁性层的复制层，用于读出磁光记录的信息，以及作为具有垂直磁各向异性的磁性层的记录层，用于 磁光记录信息。 在磁光记录介质中满足以下条件：HC1（ta）+ sigma w（ta）/ 2MS1（ta）h1 <-HC1（t）+ sigmaw（t）/ 2MS1（t）h1， 40（nm）其中h1是生殖层的厚度，HC1（ta）是室温下的生殖层的矫顽力（ta），MS1（ta）是饱和磁化强度 的生物层MS2（ta）是记录层的饱和磁化强度，σw（ta）是在所述生殖层和记录层之间形成的磁畴壁的磁畴壁能量，HC1（t）是矫顽力 温度（t）不高于室温的一定温度（tm）的生殖层MS1（t）是生殖层的饱和磁化强度，MS2（t）是记录层的饱和磁化强度， 和σw（t）是在生殖层和记录层之间形成的磁畴壁的磁畴壁能。

公开(公告)号：US4786551A

公开(公告)日：1988-11-22

申请号：US116791

申请日：1987-11-05

申请人： Tsuyoshi Ootani ,  Junsaku Nakajima ,  Chiaki Abe ,  Ikuko Wada

发明人： Tsuyoshi Ootani ,  Junsaku Nakajima ,  Chiaki Abe ,  Ikuko Wada

IPC分类号： C09C1/48 ,  C09D5/23 ,  C09D7/12 ,  C10M103/02 ,  C10M105/34 ,  C10N20/06 ,  C10N40/18 ,  G11B5/702 ,  G11B5/708 ,  G11B5/71

CPC分类号： G11B5/708 ,  G11B5/7023 ,  Y10S428/90 ,  Y10T428/25 ,  Y10T428/30 ,  Y10T428/31609 ,  Y10T428/31935

摘要： Disclosed is a magnetic recording medium having a magnetic layer composed mainly of a magnetic powder and a resin binder, wherein the magnetic layer comprises (a) an ester compound comprising (a-1) an ester compound represented by the following formula (1): ##STR1## wherein R stands for a branched alkyl group having 13 carbon atoms,(a-2) butyl stearate and (a-3) butoxyethyl stearate, and (b) carbon black comprising (b-1) carbon black having an average single particle size of 10 to 50 m.mu. and (b-2) carbon black having an average single particle size of 200 to 1,000 m.mu..This magnetic recording medium has an excellent durability and is utilized as a floppy disk or the like.

公开(公告)号：US20070177489A1

公开(公告)日：2007-08-02

申请号：US11339759

申请日：2006-01-24

申请人： Junsaku Nakajima ,  Hitoshi Takeuchi ,  Masaru Nomura ,  Kenji Ohta

发明人： Junsaku Nakajima ,  Hitoshi Takeuchi ,  Masaru Nomura ,  Kenji Ohta

IPC分类号： G11B7/00

CPC分类号： G11B20/00688 ,  G11B7/005 ,  G11B7/007 ,  G11B7/24085 ,  G11B20/00086

摘要： An optical disk has a lead-in region provided at the inner circumference side and a user region provided at the outer circumference side. Pit string 3 of pits of different depths-is-formed-in-the-lead-in-region. Light beam reflected from the pit string is detected by detector and TPP and RF signals are output by differential amplifier and addition amplifier. A ternary signal is restored from pits based on the TPP and RF signals. Information is recorded by pits of the same depth in the user region. Recording information in the depth direction in the lead-in region increases the recording capacity thereof The information recorded in the depth direction in the lead-in region cannot be transferred to a user region of another optical disk.

摘要翻译： 光盘具有设置在内周侧的引入区域和设置在外周侧的用户区域。 不同深度的坑的第3个坑的区域中的铅。 通过检测器检测从凹坑串反射的光束，TPP和RF信号由差分放大器和相加放大器输出。 基于TPP和RF信号从凹坑恢复三态信号。 信息由用户区域中相同深度的凹坑记录。 在导入区域中的深度方向的记录信息增加了记录容量。在导入区域中记录在深度方向上的信息不能传送到另一个光盘的用户区域。

公开(公告)号：US06728183B1

公开(公告)日：2004-04-27

申请号：US09512558

申请日：2000-02-24

申请人： Hitoshi Takeuchi ,  Junsaku Nakajima

发明人： Hitoshi Takeuchi ,  Junsaku Nakajima

IPC分类号： G11B7125

CPC分类号： G11B7/126 ,  G11B7/00454

摘要： An optical device to control the output power of a laser on recording and reproduction without expensive high-speed circuits is provided. The optical disk device of the present invention comprises monitor portion for monitoring the power of laser light, averaged light quantity calculating portion for calculating the averaged light quantity of the power of the laser light, memory portion for memorizing the averaged light quantity, error quantity calculated portion for calculating the difference between the output signals of the averaged light quantity calculating portion and the memory portion, and laser power control portion for controlling the power of the laser light in response to the output signal from the error quantity calculating portion.

摘要翻译： 提供了一种用于在没有昂贵的高速电路的情况下在记录和再现时控制激光器的输出功率的光学装置。 本发明的光盘装置包括用于监视激光功率的监视部分，用于计算激光功率的平均光量的平均光量计算部分，用于存储平均光量的存储部分，计算出的误差量 用于计算平均光量计算部分和存储器部分的输出信号之间的差的部分，以及用于响应于来自误差量计算部分的输出信号来控制激光功率的激光功率控制部分。

公开(公告)号：US06556517B1

公开(公告)日：2003-04-29

申请号：US09419232

申请日：1999-10-15

申请人： Junsaku Nakajima

发明人： Junsaku Nakajima

IPC分类号： G11B1100

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/00 ,  G11B5/17 ,  G11B7/122 ,  G11B7/1372 ,  G11B7/22 ,  G11B11/10536 ,  G11B11/10543 ,  G11B11/10554 ,  G11B11/1058 ,  G11B2005/0002 ,  G11B2005/0021 ,  G11B2005/3996

摘要： A magneto-optical head device includes a light source, an objective lens which condenses a light beam emitted from the light source, an auxiliary lens which converts an effective numerical aperture of the light beam condensed by the objective lens to irradiate a recording medium with the light beam, and a magnetic reproducing head which is integrated into the auxiliary lens. The magneto-optical head device can thus be decreased in size and information can be reproduced from both surfaces of a disk since the magnetic reproducing head is integrated into the auxiliary lens. Further, when a thermomagnetic recording medium is employed as the recording medium, the magneto-optical head device can reproduce information recorded at a high track density and a high line density.

摘要翻译： 磁光头装置包括光源，会聚从光源发射的光束的物镜，辅助透镜，其转换由物镜会聚的光束的有效数值孔径以照射记录介质 光束和集成到辅助透镜中的磁性再现头。 因此，磁光头装置的尺寸可以减小，并且可以从盘的两个表面再现信息，因为磁性再现头被集成到辅助透镜中。 此外，当使用热磁记录介质作为记录介质时，磁光头装置可以再现以高轨道密度和高线密度记录的信息。

公开(公告)号：US06261707B1

公开(公告)日：2001-07-17

申请号：US08147373

申请日：1993-11-03

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： G11B566

CPC分类号： G11B7/126 ,  G11B7/00718 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10517 ,  G11B11/10543 ,  G11B11/10584 ,  G11B11/10586 ,  G11B11/10595 ,  Y10S428/90

摘要： A magneto-optical recording medium is composed of a base which has a property that a light can be transmitted therethrough, a readout layer formed on the base, which has in-plane magnetization at room temperature, whereas, a transition occurs from in-plane magnetization to perpendicular magnetization as the temperature thereof is raised and a recording layer formed on the readout layer for recording information magneto-optically. A recording and reproducing method and the optical head are designed for the magneto-optical recording medium. By the recording and reproducing method using the optical head, information recorded at high density can be reproduced.

摘要翻译： 磁光记录介质由具有光透射性的基底组成，形成在基底上的读出层，其在室温下具有面内磁化，而从平面内发生转变 随着其温度升高，磁化至垂直磁化，以及形成在读出层上用于磁光记录信息的记录层。 记录和再现方法和光学头被设计用于磁光记录介质。 通过使用光学头的记录和再现方法，可以再现以高密度记录的信息。

公开(公告)号：US6042954A

公开(公告)日：2000-03-28

申请号：US844270

申请日：1997-04-18

申请人： Junji Hirokane ,  Junichiro Nakayama ,  Junsaku Nakajima ,  Akira Takahashi

发明人： Junji Hirokane ,  Junichiro Nakayama ,  Junsaku Nakajima ,  Akira Takahashi

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

CPC分类号： G11B11/10586 ,  Y10S428/90

摘要： An magneto-optical recording medium includes: a transparent dielectric layer; a reproduction layer that is in an in-plane magnetization state at room temperature and changes into a perpendicular magnetization state with a rise in temperature; a non-magnetic intermediate layer; a recording layer made of a perpendicularly magnetized film; and a protection layer, the layers being formed one after another in this order. The recording layer is made of a rare-earth and transition metal alloy, and the rare earth metal is composed of more than two kinds of rare-earth-metal elements containing Gd. The information stored in a magnetic recording domain is masked with respect to a part that is in an in-plane magnetization state. Consequently, recording can be performed with a less powerful laser beam, and each recording bit can be reproduced independently to produce high quality signals even if the converged light beam covers a neighboring recording bit within its radius.

摘要翻译： 磁光记录介质包括：透明介质层; 在室温下处于面内磁化状态并随着温度升高而变成垂直磁化状态的再生层; 非磁性中间层; 由垂直磁化膜制成的记录层; 和保护层，这些层依次依次形成。 记录层由稀土和过渡金属合金制成，稀土金属由含有Gd的两种以上的稀土金属元素组成。 存储在磁记录领域中的信息相对于处于平面内磁化状态的部分被掩蔽。 因此，可以用较不强大的激光束执行记录，并且即使会聚光束覆盖其半径内的相邻记录位，也可以独立地再现每个记录位以产生高质量信号。

公开(公告)号：US5989705A

公开(公告)日：1999-11-23

申请号：US748892

申请日：1996-11-14

申请人： Junsaku Nakajima ,  Yoshiteru Murakami ,  Akira Takahashi ,  Junji Hirokane

发明人： Junsaku Nakajima ,  Yoshiteru Murakami ,  Akira Takahashi ,  Junji Hirokane

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

CPC分类号： G11B11/10593 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magneto-optical recording disk includes a recording layer for recording information as a mark and a reproduction layer, laminated with the recording layer, to which magnetization direction of the recording layer is transferred at high temperatures, wherein the reproduction layer and the recording layer are magnetostatically coupled and are not exchange-coupled. The information is read out by using a temperature distribution generated by a light beam for reproduction. The recording layer has, on a side thereof to which the reproduction layer is not provided, a supplementary back layer of a soft magnetic material composed of ferromagnetic material. The magneto-optical disk is designed to generate good CNR and thereby improves recording density even when a short mark is reproduced.

摘要翻译： 磁光记录盘包括用于记录作为标记的信息的记录层和与记录层层叠的记录层，记录层的高度方向在高温下被转印，其中再现层和记录层是 磁静态耦合并且不交换耦合。 通过使用由光束产生的温度分布来再现信息来读出信息。 记录层在其不具有再现层的一侧具有由铁磁材料构成的软磁性材料的补充背层。 磁光盘被设计成产生良好的CNR，从而即使在再现短标记时也提高记录密度。

公开(公告)号：US5777953A

公开(公告)日：1998-07-07

申请号：US769254

申请日：1996-12-18

申请人： Junji Hirokane ,  Junichiro Nakayama ,  Junsaku Nakajima ,  Akira Takahashi ,  Kenji Ohta

发明人： Junji Hirokane ,  Junichiro Nakayama ,  Junsaku Nakajima ,  Akira Takahashi ,  Kenji Ohta

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

CPC分类号： G11B11/10515 ,  G11B11/10584 ,  G11B11/10589 ,  G11B11/10593

摘要： A magneto-optical recording medium is arranged so that (1) a first transparent dielectric layer, (2) a reproduction layer showing in-plane magnetization at room temperature while showing perpendicular magnetization in response to temperature rise, (3) a second transparent dielectric layer, (4) a recording layer made of perpendicular magnetization film; and (5) a protective layer are laminated on a substrate in this order. The reproduction layer has a thickness of 5 nm to 30 nm, the second transparent dielectric layer has a thickness of 6 nm to 40 nm, and the recording layer has a thickness of 20 nm to 80 nm. It is possible to separately reproduce individual recording bit even when one or more adjacent recording bits exist within the diameter of the light beam converged onto a target recording bit. This is because the information of a recording magnetic domain of a portion showing in-plane magnetization is masked.

摘要翻译： 磁光记录介质被布置成使得（1）第一透明介电层，（2）再现层，其在室温下显示面内磁化同时响应于温度升高而显示垂直磁化强度，（3）第二透明电介质 层，（4）由垂直磁化膜制成的记录层; 和（5）保护层依次层压在基板上。 再生层的厚度为5nm〜30nm，第二透明电介质层的厚度为6nm〜40nm，记录层的厚度为20nm〜80nm。 即使在收敛到目标记录位上的光束的直径内存在一个或多个相邻记录位，也可以分别再现单个记录位。 这是因为屏蔽显示面内磁化的部分的记录磁畴的信息。

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

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B5/66 ,  B32B5/16 ,  G11B5/02 ,  G11B11/00

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。