公开(公告)号：US5804521A

公开(公告)日：1998-09-08

申请号：US905025

申请日：1997-08-01

Applicant: Akira Takahashi ,  Masaaki Masuda ,  Keiichiro Watanabe

Inventor： Akira Takahashi ,  Masaaki Masuda ,  Keiichiro Watanabe

IPC: C04B35/626 ,  C04B35/593 ,  C04B35/587

CPC classification number: C04B35/5935

Abstract: A silicon nitride ceramic of the present invention possesses excellent strength of the surface, including a silicon nitride and a rare earth oxide compound and being characterized in that the ratio of the transverse rupture strength, at a room temperature, of the fired surface used as a tensile surface to the transverse rupture strength, at a room temperature, of the worked surface used as a tensile surface subjected to the working so as to have the surface roughness of R.sub.MAX 0.8 .mu.m or less is 0.7 or more, and the strength ratio is satisfied even when any portion besides the fired surface is utilized as the tensile surface to be worked to have the surface roughness of R.sub.MAX 0.8 .mu.m or less. The present invention also provides a process for producing a silicon nitride ceramic including the steps of: (1) mixing .alpha.-Si.sub.3 N.sub.4 powder and .beta.-Si.sub.3 N.sub.4 powder to obtain a raw material powder so as to satisfy the formula indicated by 0.05.ltoreq..beta./.alpha.+.beta..ltoreq.0.50, in which a refers to the weight of .alpha.-Si.sub.3 N.sub.4 powder and .beta. refers to the weight of .beta.-Si.sub.3 N.sub.4 powder; (2) mixing at least one sintering aid to the raw material powder; (3) forming the powder mixture to give a compact; and (4) firing the compact at a temperature ranging from 1800.degree. to 2000.degree. C. under a nitrogen atmosphere having an atmospheric pressure of at least 1 atm.

Abstract translation: 本发明的氮化硅陶瓷具有优异的表面强度，包括氮化硅和稀土氧化物，其特征在于，在室温下，作为烧结表面的烧结表面的横向断裂强度的比例 作为经受加工的拉伸面的加工面的拉伸面与横向断裂强度在室温下的表面粗糙度为0.8μm以下，强度比为 即使将烧成的表面以外的任何部分用作待加工的拉伸面，其表面粗糙度为0.8μm以下。 本发明还提供一种制造氮化硅陶瓷的方法，包括以下步骤：（1）将α-Si 3 N 4粉末和β-Si 3 N 4粉末混合以获得原料粉末，以满足0.05≤β /α+β<0.50，其中a表示α-Si 3 N 4粉末的重量，β表示β-Si 3 N 4粉末的重量; （2）将至少一种烧结助剂与原料粉末混合; （3）形成粉末混合物以产生致密的; 和（4）在大气压至少为1个大气压的氮气气氛下，在1800〜2000℃的温度下烧成。

公开(公告)号：US5754523A

公开(公告)日：1998-05-19

申请号：US534300

申请日：1995-09-27

Applicant: Toshihisa Deguchi ,  Kenji Ohta ,  Akira Takahashi ,  Kazuo Van ,  Michinobu Mieda ,  Tetsuya Inui

Inventor： Toshihisa Deguchi ,  Kenji Ohta ,  Akira Takahashi ,  Kazuo Van ,  Michinobu Mieda ,  Tetsuya Inui

IPC: G11B7/007 ,  G11B7/013 ,  G11B7/09 ,  G11B7/24 ,  G11B7/24085

CPC classification number: G11B7/0938 ,  G11B7/00745 ,  G11B7/24 ,  G11B7/24085

Abstract: In an optical memory medium comprising prepits on which a light spot is impinged to obtain information and, if required, guide grooves: each of those among the prepits which are longer than the diameter of the light spot consists of a series of pit portions and unpitted portions; each of the prepits is sandwiched between two of the discontinuous portions of guide grooves adjacent to each other; the guide grooves have one or more narrow portions, and each of the prepits is sandwiched between two of the narrow portions of guide grooves adjacent to each other; or the guide grooves have one or more long portions, one or more short portions, and narrow portions formed between the long and short portions, and each of the prepits is sandwiched between two of the short portions of guide grooves adjacent to each other.

公开(公告)号：US5740153A

公开(公告)日：1998-04-14

申请号：US801245

申请日：1997-02-19

Applicant: Kenji Ohta ,  Shigeo Terashima ,  Akira Takahashi

Inventor： Kenji Ohta ,  Shigeo Terashima ,  Akira Takahashi

IPC: G11B11/10 ,  G11B11/105 ,  G11B7/24

CPC classification number: G11B11/10584 ,  G11B11/10586 ,  G11B11/10597

Abstract: A magneto-optical disk including a transparent substrate, pit strings containing information formed in spiral or concentric form on a surface of the transparent substrate, a magneto-optical recording medium layer for covering the surface of the transparent substrate having the pit strings formed thereon, and magneto-optical recording areas formed by spiral or concentric flat portions between adjacent pit strings. An optical pickup for reproducing pit information and magneto-optically-recorded information from the magneto-optical disk. A magneto-optical disk drive for recording and reproducing information on the magneto-optical disk. The magneto-optical disk has a memory capacity which is twice the memory capacity of a conventional magneto-optical disk having ROM, and is accessed at high speeds.

公开(公告)号：US5719831A

公开(公告)日：1998-02-17

申请号：US768794

申请日：1996-12-18

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

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

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

CPC classification number: G11B23/0321 ,  G11B11/10552 ,  G11B23/03

Abstract: 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.

Abstract translation: 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：US5700073A

公开(公告)日：1997-12-23

申请号：US681525

申请日：1996-07-23

Applicant: Yutaka Hiwatashi ,  Koji Matsuno ,  Akira Takahashi ,  Munenori Matsuura

Inventor： Yutaka Hiwatashi ,  Koji Matsuno ,  Akira Takahashi ,  Munenori Matsuura

IPC: B60T8/172 ,  B60T8/1755 ,  B60T8/1763 ,  B60T8/58

CPC classification number: B60T8/1755

Abstract: A braking force control system and method of a vehicle comprises an estimated yaw rate calculating section for calculating an estimated yaw rate on a road surface having low friction coefficient, a target yaw rate differential calculating section for calculating a target yaw rate differential, an estimated yaw rate differential calculating section for calculating an estimated yaw rate differential, a yaw rate differential deviation calculating section for calculating a deviation of the both differentials, a first target braking force calculating section for calculating a first target braking force, a yaw rate deviation calculating section for calculating a deviation of an actual yaw rate and a target yaw rate, a second target braking force calculating section for calculating a second target braking force, a final target braking force calculating section for calculating a final target braking force based on the first and second target braking forces. When an output judging section judges that the deviation of the actual yaw rate and the target yaw rate is in the control zone, a brake signal is outputted to a brake drive section so as to apply the final target braking force to a braking wheel selected in a braking wheel determining section, whereby the vehicle can make a smooth and stable turn without causing spins or drift-outs during cornerings.

Abstract translation: 车辆的制动力控制系统和方法包括估计的横摆率计算部分，用于计算具有低摩擦系数的路面上的估计横摆角速度，用于计算目标横摆角速度差的目标横摆角速度差分计算部，估计偏航 用于计算估计的横摆角速度差的速率差分计算部分，用于计算两个差值的偏差的横摆率差分偏差计算部分，用于计算第一目标制动力的第一目标制动力计算部分，用于计算第一目标制动力的横摆率偏差计算部分， 计算实际横摆率和目标偏航率的偏差，用于计算第二目标制动力的第二目标制动力计算部，基于第一和第二目标计算最终目标制动力的最终目标制动力计算部 制动力。 当输出判断部判定实际横摆率和目标横摆角速度的偏差在控制区域内时，制动信号被输出到制动驱动部，以将最终目标制动力施加到在 制动轮确定部分，由此车辆可以在转弯期间不会引起旋转或漂移而平稳而稳定地转动。

公开(公告)号：US5691963A

公开(公告)日：1997-11-25

申请号：US744565

申请日：1996-11-06

Applicant: Junji Hirokane ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

Inventor： Junji Hirokane ,  Hiroyuki Katayama ,  Akira Takahashi ,  Kenji Ohta

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

CPC classification number: G11B11/10515 ,  G11B11/10521 ,  G11B11/10591 ,  Y10S428/90 ,  Y10T428/12736 ,  Y10T428/12771 ,  Y10T428/12868 ,  Y10T428/12896 ,  Y10T428/12903 ,  Y10T428/1291 ,  Y10T428/12917 ,  Y10T428/12924 ,  Y10T428/12931 ,  Y10T428/12937 ,  Y10T428/26 ,  Y10T428/265

Abstract: A magneto-optical recording medium including a base; a readout layer formed on the base; a recording layer formed on the readout layer; and an auxiliary recording layer formed on the recording layer, each of the readout layer, recording layer and auxiliary recording layer being made of an alloy of rare-earth metal and transition metal showing ferrimagnetism. The alloy composition of each layer is determined so that the recording layer has a Curie temperature lower than Curie temperatures of the readout layer and the auxiliary recording layer and has a coercive force higher than coercive forces of the readout layer and the auxiliary recording layer at room temperature and that, when the temperature of the recording layer is raised to near its Curie temperature while perpendicularly applying a uniform recording magnetic field to each layer, a sublattice magnetic moment of the rare-earth metal of the readout layer and a sublattice magnetic moment of the rare-earth metal of the auxiliary recording layer are antiparallel to each other. And, a method of recording information on the magneto-optical recording medium. This structure enables overwriting by light-intensity modulation without using an initializing magnetic field.

Abstract translation: 一种包括基底的磁光记录介质; 形成在基底上的读出层; 形成在读出层上的记录层; 以及形成在记录层上的辅助记录层，每个读出层，记录层和辅助记录层由稀土金属和过渡金属的合金制成，显示出铁磁性。 确定每层的合金组成，使得记录层的居里温度低于读出层和辅助记录层的居里温度，并且具有高于室内读出层和辅助记录层的矫顽力的矫顽力 并且当在每个层垂直地施加均匀的记录磁场的同时将记录层的温度升高到靠近其居里温度时，读出层的稀土金属的亚晶格磁矩和亚晶格磁矩 辅助记录层的稀土金属彼此反平行。 以及在磁光记录介质上记录信息的方法。 该结构能够通过光强度调制而不使用初始化磁场。

公开(公告)号：US5684764A

公开(公告)日：1997-11-04

申请号：US595259

申请日：1996-02-01

Applicant: Junji Hirokane ,  Michinobu Mieda ,  Junichiro Nakayama ,  Akira Takahashi

Inventor： Junji Hirokane ,  Michinobu Mieda ,  Junichiro Nakayama ,  Akira Takahashi

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

CPC classification number: G11B11/10515 ,  G11B11/10586

Abstract: A magneto-optical disk provided with a record layer having a recording magnetic domain where data are recorded, an auxiliary reproduction layer for transferring the record data in the record layer to a reproduction layer by generating a floating magnetic field corresponding to the data in the record layer, and the reproduction layer from which the data are read out through irradiation of a light beam, which are sequentially layered while interposing non-magnetic intermediate layers therebetween. The stable magnetic domain width in the auxiliary reproduction layer is shorter than the recording magnetic domain width at room temperature and extends as the temperature rises and becomes longer at or above a first temperature. The stable magnetic domain width in the reproduction layer is longer than the recording magnetic domain width at room temperature and lessens as the temperature rises and becomes shorter at or above a second temperature which is lower than the first temperature. The first and second temperatures satisfy a condition expressed as: room temperature

Abstract translation: 具有记录数据的记录磁畴的磁光盘，用于通过产生与记录中的数据相对应的浮动磁场将记录层中的记录数据传送到再现层的辅助再现层 层，以及通过照射光束从中读出数据的再现层，它们在介于其间的非磁性中间层的顺序层叠。 辅助再生层中的稳定的磁畴宽度比室温下的记录磁畴宽度短，随着温度升高而延长，在第一温度以上也变长。 再生层中的稳定的磁畴宽度比室温下的记录磁畴宽度长，随着温度的升高而降低，在比第一温度低的第二温度以上也变短。 第一和第二温度满足表示为：室温<第二温度<第一温度

公开(公告)号：USRE35629E

公开(公告)日：1997-10-14

申请号：US136019

申请日：1993-10-14

Applicant: Yoshiteru Murakami ,  Akira Takahashi ,  Kazuo Van ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Kenji Ohta

Inventor： Yoshiteru Murakami ,  Akira Takahashi ,  Kazuo Van ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Kenji Ohta

IPC: G11B11/10 ,  G11B11/105 ,  G11B7/24

CPC classification number: G11B11/10584 ,  G11B11/10586

Abstract: 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.

Abstract translation: 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

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

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

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

CPC classification number: G11B11/10586 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

Abstract: 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.

Abstract translation: 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：US5659537A

公开(公告)日：1997-08-19

申请号：US459338

申请日：1995-06-02

Applicant: Junji Hirokane ,  Junichiro Nakayama ,  Michinobu Mieda ,  Akira Takahashi

Inventor： Junji Hirokane ,  Junichiro Nakayama ,  Michinobu Mieda ,  Akira Takahashi

IPC: G11B11/10 ,  G11B11/105 ,  G11B7/00

CPC classification number: G11B11/10593 ,  G11B11/10515 ,  G11B11/10584

Abstract: A recording layer including a recording magnetic domain for recording thereon information is formed. A reproducing layer for reproducing information by projecting thereto a light beam is formed on the recording layer. A non-magnetic intermediate layer for intercepting a magnetic exchange coupling force exerted between the recording layer and the reproducing layer is formed between the recording layer and the reproducing layer. The reproducing layer is arranged such that the width of the stable magnetic domain on the reproducing layer at room temperature is larger than the width of the recording magnetic domain in the recording layer. At a reproducing temperature by the light beam, the width of the stable magnetic domain becomes smaller than the width of the recording magnetic domain, and the information is copied by the leakage magnetic flux of the recording magnetic domain. Depending on whether or not the information transferred to the reproducing layer is reproduced, the effects from other magnetic domain adjacent to the magnetic domain to be reproduced from the reproducing layer can be prevented, thereby enabling a high density recording of information on the recording layer.

Abstract translation: 形成包括用于在其上记录信息的记录磁畴的记录层。 在记录层上形成用于通过向其投射光来再现信息的再现层。 在记录层和再现层之间形成用于截取在记录层和再现层之间施加的磁交换耦合力的非磁性中间层。 再现层被布置成使得在室温下再现层上的稳定磁畴的宽度大于记录层中记录磁畴的宽度。 在光束的再现温度下，稳定磁畴的宽度变得小于记录磁畴的宽度，并且通过记录磁畴的泄漏磁通来复制信息。 根据传送到再现层的信息是否被再现，可以防止从再现层再现的与磁畴相邻的其它磁畴的影响，从而能够在记录层上高密度地记录信息。