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    Magneto-optical recording method using the relation of beam diameter and an aperture of converging lens
    3.
    发明授权
    Magneto-optical recording method using the relation of beam diameter and an aperture of converging lens 失效
    使用光束直径与会聚透镜孔径的磁光记录方法

    公开(公告)号：US06483785B1

    公开(公告)日：2002-11-19

    申请号：US09685829

    申请日：2000-10-10

    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： G11B1100

    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： Featured is a recording and reproducing method for recording and reproducing information on and from a recording medium. The medium includes a base having a property that a light can be transmitted therethrough, a readout layer formed on the base, which has an in-plane magnetization at room temperature, whereas, a transition occurs from in-plane magnetization to perpendicular magnetization as temperature rises and a recording layer formed on said readout layer for recording thereon information magneto-optically. A groove for guiding a light beam is formed on a readout layer side of the base and a groove width is set substantially equal to a land width formed between grooves. The recording layer on the grooves and the recording layer on lands are used in recording and reproducing information. Further a light beam is incident on a converging lens of an optical head, the light beam having a larger diameter &ohgr; than an aperture &agr; of the converging lens for converging the light beam on a predetermined position of the magneto-optical recording medium.

    摘要翻译： 特色是用于在记录介质上记录和再现信息的记录和再现方法。 该介质包括具有光可以透射的性质的基底，形成在基底上的读出层，其在室温下具有面内磁化强度，而从平面内磁化转变为垂直磁化转变为温度 并且在所述读出层上形成用于在其上记录光学信息的记录层。 在基板的读出层侧形成用于引导光束的槽，并且将槽宽度设定为与槽之间形成的焊盘宽度大致相等。 凹槽上的记录层和焊盘上的记录层用于记录和再现信息。 此外，光束入射到光学头的会聚透镜上，所述光束具有比会聚透镜的孔径α更大的直径Ω，用于将光束会聚在磁光记录介质的预定位置。

    Magnetic recording medium and information recording-reproduction method using the same
    4.
    发明授权
    Magnetic recording medium and information recording-reproduction method using the same 失效
    磁记录介质和使用该磁记录介质的信息记录再现方法

    公开(公告)号：US6143436A

    公开(公告)日：2000-11-07

    申请号：US909194

    申请日：1997-08-11

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

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

    IPC分类号： G11B11/10 ,  G03G5/16 ,  G11B5/00 ,  G11B5/02 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/74 ,  G11B11/105 ,  G11B13/04 ,  G11B19/02

    CPC分类号： G03G5/16 ,  G11B11/10589 ,  G11B13/045 ,  G11B5/00 ,  G11B5/656 ,  G11B11/10504 ,  G11B11/10515 ,  G11B11/10532 ,  G11B19/02 ,  G11B2005/0002 ,  G11B2005/0021 ,  G11B5/74 ,  Y10S428/90

    摘要： A magnetic recording medium having a recording layer made up of a ferrimagnetic material whose compensation temperature is included within room temperatures and an information recording-reproduction method using the magnetic recording medium. During recording, while a light beam is projected on the recording layer so as to raise the temperature of a recording portion, information is recorded by applying a signal magnetic field from a magnetic head. During reproduction, while a light beam is projected on a reproducing portion of the recording layer so as to raise the temperature thereof, information is reproduced by detecting leakage flux from the reproducing portion by the magnetic head. Thus, during reproduction, no magnetic flux is generated from other portions of the recording layer not irradiated by the light beam. With the arrangement, crosstalk due to leakage flux from adjoining tracks not irradiated by the optical beam can be eliminated. Therefore, track pitches can be made narrower so as to increase recording density of the magnetic recording medium. Further, since crosstalk from adjoining tracks is eliminated, a high S/N can be achieved.

    摘要翻译： 一种磁记录介质，其具有由补偿温度包括在室温内的铁氧体材料制成的记录层和使用该磁记录介质的信息记录再现方法。 在记录期间，当光束投射在记录层上以提高记录部分的温度时，通过施加来自磁头的信号磁场来记录信息。 在再现期间，当光束投射在记录层的再现部分上以升高其温度时，通过由磁头检测来自再现部分的漏磁通来再现信息。 因此，在再现期间，不会由不被光束照射的记录层的其它部分产生磁通量。 利用该布置，可以消除由于未被光束照射的相邻轨道的漏磁通引起的串扰。 因此，可以使轨道间距更窄，以提高磁记录介质的记录密度。 此外，由于消除了来自相邻轨道的串扰，可以实现高S / N。

    Magneto-optical memory element
    5.
    再颁专利
    Magneto-optical memory element 失效
    磁光存储元件

    公开(公告)号：USRE35629E

    公开(公告)日：1997-10-14

    申请号：US136019

    申请日：1993-10-14

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

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

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

    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.

    摘要翻译： 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。

    Magneto-optical disk and the reproducing method thereof
    6.
    发明授权
    Magneto-optical disk and the reproducing method thereof 失效
    磁光盘及其再现方法

    公开(公告)号：US5477528A

    公开(公告)日：1995-12-19

    申请号：US346586

    申请日：1994-11-16

    申请人： Yoshiteru Murakami ,  Junsaku Nakajima ,  Akira Takahashi ,  Junichiro Nakayama ,  Kenji Ohta

    发明人： Yoshiteru Murakami ,  Junsaku Nakajima ,  Akira Takahashi ,  Junichiro Nakayama ,  Kenji Ohta

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

    CPC分类号： G11B11/10515 ,  G11B11/10595

    摘要： A magneto-optical disk, which possesses a disc-shaped substrate and a recording layer composed of a perpendicular magnetization film that is formed on the substrate, characterized in having: an area wherein magnetic domains having an upward magnetization and magnetic domains having a downward magnetization are alternately aligned along at least one circuit of the disk, the area being formed on the recording layer, the length of the magnetic domains having the upward magnetization being virtually equal to the length of the magnetic domains having the downward magnetization. This invention also has a reproducing method which is characterized in that, when information is reproduced by projecting a light beam onto the magneto-optical recording disk, the intensity of the light beam is adjusted so as to maximize the amplitude of a reproduced signal that is obtained from the area. With the above arrangement, a high-quality reproduced signal can be obtained independent of the characteristics of individual magneto-optical disks.

    摘要翻译： 一种磁光盘，其具有盘形基板和由形成在基板上的垂直磁化膜构成的记录层，其特征在于具有：具有向上磁化的磁畴和具有向下磁化的磁畴的区域 沿着盘的至少一个电路交替排列，所述区域形成在记录层上，具有向上磁化的磁畴的长度实质上等于具有向下磁化的磁畴的长度。 本发明还具有一种再现方法，其特征在于，当通过将光束投射到磁光记录盘上来再现信息时，调整光束的强度，以使得再现信号的幅度最大化 从该地区获得。 通过上述配置，可以独立于各个磁光盘的特性来获得高质量的再生信号。

    Magneto-optical recording and reproducing device having light interrupting forming main robe and side robe light beam portions
    7.
    发明授权
    Magneto-optical recording and reproducing device having light interrupting forming main robe and side robe light beam portions 失效
    具有遮光形成主袍和侧蓬灯光部分的磁光记录和再现装置

    公开(公告)号：US5452272A

    公开(公告)日：1995-09-19

    申请号：US175748

    申请日：1993-12-30

    申请人： Yoshiteru Murakami ,  Junsaku Nakajima ,  Akira Takahashi ,  Kenji Ohta

    发明人： Yoshiteru Murakami ,  Junsaku Nakajima ,  Akira Takahashi ,  Kenji Ohta

    IPC分类号： G11B7/135 ,  G11B11/10 ,  G11B11/105 ,  G11B11/00

    CPC分类号： G11B11/10586 ,  G11B11/10515 ,  G11B11/10543

    摘要： A magneto-optical recording and reproducing device is provided with a magneto-optical disk for reproducing recorded information using light, a semiconductor laser, an objective lens for converging a light beam emitted from the semiconductor laser onto the magneto-optical disk and a light interrupting member for interrupting a portion of a light beam before it is incident on the objective lens. The magneto-optical disk is composed of a readout layer which is predominant in in-plane magnetization, and in which a transition occurs to be predominant in perpendicular magnetization as temperature thereof is raised and a recording layer for recording thereon information using a perpendicular magnetization. In this arrangement, since the light interrupting member is provided, a light spot can be made smaller, thereby improving a recording density. Moreover, even when temperature of the readout layer is raised due to a side robe generated by the light interrupting member, in-plane magnetization is maintained in the readout layer. Thus, interference by unwanted reproducing signals due to the side robe can be prevented, thereby improving a reproducing signal quality.

    摘要翻译： 磁光记录和再现装置设置有用于使用光再现记录信息的磁光盘，半导体激光器，用于将从半导体激光器发射的光束会聚到磁光盘上的物镜和光中断 用于在光束入射到物镜之前中断光束的一部分。 磁光盘由在平面磁化中占主要地位的读出层组成，其中随着温度的升高而在垂直磁化中发生转移，而在其中利用垂直磁化记录信息的记录层。 在这种布置中，由于设置了遮光构件，可以使光点更小，从而提高记录密度。 此外，即使由于由遮光构件产生的侧蓬而导致读出层的温度上升，在读出层中也保持平面内的磁化。 因此，可以防止由于侧灯引起的不必要的再现信号的干扰，从而提高再现信号质量。

    Magnetic recording and reproducing apparatus having a ferrimagnetic recording medium, a magnetic head and first and second light sources
    8.
    发明授权
    Magnetic recording and reproducing apparatus having a ferrimagnetic recording medium, a magnetic head and first and second light sources 失效
    具有铁磁记录介质，磁头和第一和第二光源的磁记录和重放装置

    公开(公告)号：US5293359A

    公开(公告)日：1994-03-08

    申请号：US741932

    申请日：1991-08-08

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

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

    IPC分类号： G11B5/02 ,  G11B5/00 ,  G11B11/10 ,  G11B11/105 ,  G11B13/04

    CPC分类号： G11B5/00 ,  G11B2005/0021

    摘要： A magnetic recording and reproducing apparatus using a recording medium made of a ferrimagnetic material, comprises a magnetic head for magnetically recording information on a recording area of a selected information recording track on a recording medium having a plurality of tracks and for magnetically reproducing the information from the recording medium, the magnetic head has a width larger than that of the width of the selected information recording track of the recording medium. For recording, light beams are radiated from a first light source on the recording area of the selected information recording track upon which recording is to be performed tracks to raise the temperature of the irradiated area to approximately a Curie temperature so as to allow recording only on that area. For reproduction, light beams are radiated from another light source onto areas on both sides of on a second area of the recording medium, located on both sides of the selected information recording track, to raise the temperature of the second irradiated areas to approximately a magnetic compensation temperature so as to allow reproduction only from the desired track, thus preventing crosstalk from the side tracks.

    摘要翻译： 使用由铁氧体材料制成的记录介质的磁记录和再现装置包括磁头，用于在具有多个轨道的记录介质上将所选择的信息记录轨道的记录区域上的信息磁记录，并用于从 记录介质中，磁头的宽度大于记录介质的选定信息记录道的宽度。 为了进行记录，光束从要进行记录的所选择的信息记录轨道的记录区域上的第一光源辐射，以将照射区域的温度升高到大约居里温度，以便仅在 那个地区。 为了再现，将光束从另一光源辐射到位于所选择的信息记录轨道的两侧的记录介质的第二区域的两侧的区域上，以将第二照射区域的温度升高到大约磁 补偿温度，以便仅允许从期望的轨道进行再现，从而防止来自侧轨的串扰。