公开(公告)号：US5991259A

公开(公告)日：1999-11-23

申请号：US886299

申请日：1997-07-01

申请人： Junichiro Nakayama ,  Naoyasu Iketani ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Akira Takahashi

发明人： Junichiro Nakayama ,  Naoyasu Iketani ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Akira Takahashi

IPC分类号： G11B7/24 ,  G11B7/00 ,  G11B7/004 ,  G11B7/007 ,  G11B7/09 ,  G11B7/26 ,  G11B27/19 ,  G11B27/30

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。

公开(公告)号：US06463015B1

公开(公告)日：2002-10-08

申请号：US09633914

申请日：2000-08-08

申请人： Junji Hirokane ,  Yoshiteru Murakami ,  Akira Takahashi

发明人： Junji Hirokane ,  Yoshiteru Murakami ,  Akira Takahashi

IPC分类号： G11B724

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

摘要： A magneto-optical recording medium of the present invention has a recording layer made of a perpendicular magnetization film, and a readout layer which is in an in-plane magnetization state at room temperature and changes into a perpendicular magnetization state with a rise in temperature. When the magneto-optical recording medium is irradiated with a light beam, the readout layer separates into three regions: a region in an in-plane magnetization state, a region in a perpendicular magnetization state, and a region having a temperature not lower than the Curie temperature thereof. Only the region in the perpendicular magnetization state allows copying of the magnetization of the recording layer. Therefore, even when the diameter and intervals of recording bits on the recording layer are very small, it is possible to reproduce a target recording bit separately from a recording bit adjacent to the target recording bit.

摘要翻译： 本发明的磁光记录介质具有由垂直磁化膜构成的记录层和在室温下处于面内磁化状态的读出层，随温度升高而变为垂直磁化状态。 当磁光记录介质被光束照射时，读出层分为三个区域：面内磁化状态的区域，垂直磁化状态的区域和温度不低于 居里温度。 只有垂直磁化状态的区域才允许复制记录层的磁化。 因此，即使当记录层上的记录位的直径和间隔非常小时，也可以与目标记录位相邻的记录位分开再现目标记录位。

公开(公告)号：US5058099A

公开(公告)日：1991-10-15

申请号：US391249

申请日：1989-08-09

申请人： Yoshiteru Murakami ,  Akira Takahashi ,  Kazuo Van ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Kouji Ohta

发明人： Yoshiteru Murakami ,  Akira Takahashi ,  Kazuo Van ,  Junichiro Nakayama ,  Hiroyuki Katayama ,  Kouji Ohta

IPC分类号： G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10584 ,  G11B11/10586

摘要： 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.

公开(公告)号：US06178143B1

公开(公告)日：2001-01-23

申请号：US09258180

申请日：1999-02-25

申请人： Junji Hirokane ,  Yoshiteru Murakami ,  Akira Takahashi

发明人： Junji Hirokane ,  Yoshiteru Murakami ,  Akira Takahashi

IPC分类号： G11B1100

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

摘要： A magneto-optical recording medium has a recording layer made of a perpendicular magnetization film, and a readout layer which is in an in-plane magnetization state at room temperature and changes into a perpendicular magnetization state with a rise in temperature. When the magneto-optical recording medium is irradiated with a light beam, the readout layer separates into three regions: a region in an in-plane magnetization state, a region in a perpendicular magnetization state, and a region having a temperature not lower than the Curie temperature thereof. Only the region in the perpendicular magnetization state allows copying of the magnetization of the recording layer. Therefore, even when the diameter and intervals of recording bits on the recording layer are very small, it is possible to reproduce a target recording bit separately from a recording bit adjacent to the target recording bit.

摘要翻译： 磁光记录介质具有由垂直磁化膜制成的记录层和在室温下处于平面内磁化状态并随温度升高而变为垂直磁化状态的读出层。 当磁光记录介质被光束照射时，读出层分为三个区域：面内磁化状态的区域，垂直磁化状态的区域和温度不低于 居里温度。 只有垂直磁化状态的区域才允许复制记录层的磁化。 因此，即使当记录层上的记录位的直径和间隔非常小时，也可以与目标记录位相邻的记录位分开再现目标记录位。

公开(公告)号：US5985436A

公开(公告)日：1999-11-16

申请号：US935395

申请日：1997-09-23

申请人： Junji Hirokane ,  Yoshiteru Murakami ,  Akira Takahashi

发明人： Junji Hirokane ,  Yoshiteru Murakami ,  Akira Takahashi

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

CPC分类号： G11B11/10508 ,  G11B11/10591 ,  G11B11/10593 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magneto-optical recording medium including at least a recording layer, and an auxiliary recording layer which achieves magnetostatic coupling with the recording layer. The auxiliary recording layer is in an in-plane magnetization state at temperatures lower than a recording temperature, and in a perpendicular magnetization state at temperatures not lower than the recording temperature. It is therefore possible to achieve a decrease in a recording magnetic field.

摘要翻译： 至少包括记录层的磁光记录介质和与记录层实现静磁耦合的辅助记录层。 辅助记录层在低于记录温度的温度下处于平面内磁化状态，并且在不低于记录温度的温度下处于垂直磁化状态。 因此，可以实现记录磁场的减小。

公开(公告)号：US5933411A

公开(公告)日：1999-08-03

申请号：US890401

申请日：1997-07-09

申请人： Tetsuya Inui ,  Hideaki Sato ,  Junichiro Nakayama ,  Naoyasu Iketani ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

发明人： Tetsuya Inui ,  Hideaki Sato ,  Junichiro Nakayama ,  Naoyasu Iketani ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

IPC分类号： G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/24 ,  G11B7/26 ,  G11B11/105

CPC分类号： G11B7/005 ,  G11B7/00718 ,  G11B7/00745 ,  G11B7/0901 ,  G11B7/261 ,  G11B11/10578 ,  G11B11/10582 ,  G11B7/0938 ,  G11B7/24

摘要： An optical disk has address recording sections each of which has a wobbled part of one of side walls of a groove. Each address recording section is formed by providing convexes of a groove in an adjacent land so as to widen the groove. With the wobbles thus provided in a concavo-convex form, address information is recorded. Besides, the address recording sections thus provided in the grooves are linearly disposed in radial directions of the optical disk. By thus arranging the optical disk on whose grooves and/or lands information is recorded, mixing of wobble frequency components in reproduced information signals does not occur, the sector method is applicable to the optical disk, and information signals of high quality can be obtained.

摘要翻译： 光盘具有地址记录部分，每个地址记录部分具有凹槽的一个侧壁的摆动部分。 每个地址记录部分通过在相邻的凸台中提供凹槽的凸起来形成，以便加宽凹槽。 由于以这样提供的摆动形式为凹凸形式，所以记录地址信息。 此外，这样设置在凹槽中的地址记录部分在光盘的径向上线性地设置。 通过这样布置记录有槽和/或焊盘信息的光盘，不会发生重放信息信号中的摆动频率分量的混合，扇区方法可应用于光盘，并且可以获得高质量的信息信号。

公开(公告)号：US5768218A

公开(公告)日：1998-06-16

申请号：US803274

申请日：1997-02-20

申请人： Junichiro Nakayama ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

发明人： Junichiro Nakayama ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

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

CPC分类号： G11B11/10584 ,  G11B11/10586 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10521

摘要： A magneto-optical recording medium has a transparent substrate, a first magnetic layer, first intermediate layer, a second magnetic layer, and a third magnetic layer provided in this order. The first magnetic layer has an in-plane magnetization at room temperature, while a transition from the in-plane magnetization to a perpendicular magnetization occurs to the first magnetic layer with a temperature rise. The first intermediate layer is made of a non-magnetic substance. The second magnetic layer is a film having a perpendicular magnetization. The third magnetic layer is a film having a perpendicular magnetization, has a coercive force smaller than that of the second magnetic layer at room temperature, and has a Curie temperature higher than that of the second magnetic layer. The light intensity modulation overwriting method is applicable to the magneto-optical recording medium thus arranged, superior reproduction signal characteristics can be obtained with respect to this magneto-optical recording medium, and reproduction can be carried out with respect to the recording medium even though it has recording bits whose each diameter is smaller than that of a light beam. Thus it is possible to provide the magneto-optical recording medium suitable for high density recording.

摘要翻译： 磁光记录介质具有依次设置的透明基板，第一磁性层，第一中间层，第二磁性层和第三磁性层。 第一磁性层在室温下具有平面内的磁化强度，而从第一磁性层的温度上升发生从面内磁化向垂直磁化的转变。 第一中间层由非磁性物质制成。 第二磁性层是具有垂直磁化强度的膜。 第三磁性层是具有垂直磁化的膜，在室温下的矫顽力小于第二磁性层的矫顽力，并且居里温度高于第二磁性层的居里温度。 光强度调制重写方法适用于如此布置的磁光记录介质，可以获得相对于该磁光记录介质的优良再现信号特性，并且可以相对于记录介质进行再现，即使它 具有每个直径小于光束直径的记录位。 因此，可以提供适合于高密度记录的磁光记录介质。

公开(公告)号：US06128274A

公开(公告)日：2000-10-03

申请号：US188581

申请日：1998-11-09

申请人： Go Mori ,  Michinobu Mieda ,  Naoyasu Iketani ,  Ippei Suzuki ,  Yoshiteru Murakami ,  Akira Takahashi

发明人： Go Mori ,  Michinobu Mieda ,  Naoyasu Iketani ,  Ippei Suzuki ,  Yoshiteru Murakami ,  Akira Takahashi

IPC分类号： G11B7/24 ,  G11B7/241 ,  G11B7/257 ,  G11B11/105

CPC分类号： G11B7/252 ,  G11B7/24056 ,  G11B7/24067 ,  G11B11/10584 ,  G11B2007/25706 ,  G11B2007/25708 ,  G11B2007/2571 ,  G11B2007/25713 ,  G11B2007/25715 ,  G11B2007/25718 ,  G11B7/2533 ,  G11B7/2534 ,  G11B7/2542 ,  G11B7/2578

摘要： An optical disk of the present invention includes a transparent dielectric film formed on a light incident side of the disk on an opposite side of an optical recording film so as to sandwich the transparent substrate therebetween, for suppressing bimetallic effects caused by a difference in thermal expansion between an optical recording film formed on an optical recording surface and the transparent substrate, whereby changes in tilt against temperature changes can be suppressed. Further, by an optimal selection of a reflectance of the transparent dielectric film, unwanted reflection due to multi-interference can be reduced at the same time.

摘要翻译： 本发明的光盘包括形成在光记录膜的相对侧上的光盘入射侧的透明电介质膜，以将透明基板夹在其间，用于抑制由热膨胀差引起的双金属效应 在形成在光学记录表面上的光学记录膜与透明基板之间，由此能够抑制倾斜温度变化的变化。 此外，通过对透明电介质膜的反射率的最佳选择，可以同时减少由于多次干涉引起的不期望的反射。

公开(公告)号：US6031816A

公开(公告)日：2000-02-29

申请号：US330495

申请日：1999-06-11

申请人： Tetsuya Inui ,  Hideaki Sato ,  Junichiro Nakayama ,  Naoyasu Iketani ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

发明人： Tetsuya Inui ,  Hideaki Sato ,  Junichiro Nakayama ,  Naoyasu Iketani ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junji Hirokane ,  Akira Takahashi

IPC分类号： G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B7/24 ,  G11B7/26 ,  G11B11/105

CPC分类号： G11B7/005 ,  G11B7/00718 ,  G11B7/00745 ,  G11B7/0901 ,  G11B7/261 ,  G11B11/10578 ,  G11B11/10582 ,  G11B7/0938 ,  G11B7/24

摘要： An optical disk has address recording sections each of which has a wobbled part of one of side walls of a groove. Each address recording section is formed by providing convexes of a groove in an adjacent land so as to widen the groove. With the wobbles thus provided in a concavo-convex form, address information is recorded. Besides, the address recording sections thus provided in the grooves are linearly disposed in radial directions of the optical disk. By thus arranging the optical disk on whose grooves and/or lands information is recorded, mixing of wobble frequency components in reproduced information signals does not occur, the sector method is applicable to the optical disk, and information signals of high quality can be obtained.

摘要翻译： 光盘具有地址记录部分，每个地址记录部分具有凹槽的一个侧壁的摆动部分。 每个地址记录部分通过在相邻的凸台中提供凹槽的凸起来形成，以便加宽凹槽。 由于以这样提供的摆动形式为凹凸形式，所以记录地址信息。 此外，这样设置在凹槽中的地址记录部分在光盘的径向上线性地设置。 通过这样布置记录有槽和/或焊盘信息的光盘，不会发生重放信息信号中的摆动频率分量的混合，扇区方法可应用于光盘，并且可以获得高质量的信息信号。

公开(公告)号：US5955191A

公开(公告)日：1999-09-21

申请号：US898270

申请日：1997-07-22

申请人： Junji Hirokane ,  Yoshiteru Murakami ,  Akira Takahashi

发明人： Junji Hirokane ,  Yoshiteru Murakami ,  Akira Takahashi

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

CPC分类号： G11B11/10593 ,  G11B11/10515 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A super-resolution magneto-optical recording medium has a reproducing layer, an in-plane magnetization layer and a recording layer. The reproducing layer and the recording layer are magnetostatically coupled, and each of the layers is made of a rare-earth transition-metal alloy which has a greater transition-metal sublattice moment than the compensation composition, and exhibits perpendicular magnetization, if it exists alone. At a temperature not more than the Curie temperature, the in-plane magnetization layer is exchange-coupled with the reproducing layer so as to allow the reproducing layer to exhibit in-plane magnetization. Since the reproducing layer is allowed to exhibit in-plane magnetization by the in-plane magnetization layer, it is not necessary to use a material containing a greater rare-earth metal sublattice moment as the reproducing layer. Therefore, at portions in the in-plane magnetization layer having temperatures higher than the Curie temperature, the directions of the transition-metal sublattice moments of the reproducing layer and the recording layer are aligned in parallel with each other. Thus, the reproducing polarity of this medium becomes the same as the polarity of a magneto-optical recording medium without a reproducing layer, thereby allowing compatibility with each other.

摘要翻译： 超分辨率磁光记录介质具有再现层，平面内磁化层和记录层。 再现层和记录层是静磁耦合的，并且每个层由稀土过渡金属合金制成，其具有比补偿组合物更大的过渡金属亚晶格力矩，并且如果单独存在则呈现垂直磁化 。 在不高于居里温度的温度下，面内磁化层与再生层交换耦合，以使再现层呈现面内磁化。 由于通过面内磁化层允许再现层表现出平面内的磁化，因此不需要使用含有较大稀土金属亚晶格力矩的材料作为再生层。 因此，在具有高于居里温度的面内的磁化层的部分，再现层和记录层的过渡金属亚晶格矩的方向彼此平行排列。 因此，该介质的再现极性与没有再现层的磁光记录介质的极性相同，从而允许彼此兼容。