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    Magneto-optical recording medium having a plurality of magnetic layers
    54.
    发明授权
    Magneto-optical recording medium having a plurality of magnetic layers 失效
    具有多个磁性层的磁光记录介质

    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。

    Method for reproducing optical disk
    56.
    发明授权
    Method for reproducing optical disk 失效
    光盘再现方法

    公开(公告)号：US5909412A

    公开(公告)日：1999-06-01

    申请号：US977206

    申请日：1997-11-24

    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： G11B7/00 ,  G11B7/005 ,  G11B7/007 ,  G11B7/09 ,  G11B27/19 ,  G11B27/30 ,  G11B17/22

    CPC分类号： G11B7/24082 ,  G11B27/19 ,  G11B27/3027 ,  G11B7/0903 ,  G11B7/0938

    摘要： In a method for reproducing an optical disk of the present invention, address information of an optical disk, provided with tracking guides composed of (1) a wobbling groove wobbled in accordance with address information and (2) a normal groove which is not wobbled, is reproduced. The wobbling groove and the normal groove are alternately provided in a radius direction of the optical disk. When carrying out recording and reproducing of the optical disk, three beams composed of one main beam and two sub beams are used. The three beams are projected so that (a) the sub beams are respectively on the wobbling groove and the normal groove and (b) the main beam is on a land between the wobbling groove and the normal groove. The address information is found from reflected light of one of the sub beams. The above arrangement allows respective central portions of the sub beams to track the tracking guides. Therefore, even in the case where the optical disk is tilted or vibrated, the sub beams do not deviate totally off the tracking guides, thereby permitting to stably reproduce the address information.

    摘要翻译： 在本发明的再现光盘的方法中，具有由（1）根据地址信息摆动的摆动槽和（2）未摆动的正常槽构成的跟踪引导件的光盘的地址信息， 被转载。 在光盘的半径方向交替设置摆动槽和法线槽。 当执行光盘的记录和再现时，使用由一个主光束和两个子光束组成的三个光束。 这三个光束被投影，使得（a）子光束分别位于摆动槽和普通槽上，（b）主光束位于摆动槽和正常槽之间的焊盘上。 从一个子光束的反射光中找到地址信息。 上述布置允许子光束的各个中心部分跟踪跟踪引导件。 因此，即使在光盘倾斜或振动的情况下，子光束也不完全偏离跟踪引导件，从而允许稳定地再现地址信息。

    Magnetic recording medium and information recording-reproduction method using the same
    57.
    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 recording and reproducing device having light interrupting forming main robe and side robe light beam portions
    58.
    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
    59.
    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。

    Magneto-optical recording medium having a readout layer with varying composition and curie temperature
    60.
    发明授权
    Magneto-optical recording medium having a readout layer with varying composition and curie temperature 失效
    磁光记录介质具有不同组成和居里温度的读出层

    公开(公告)号：US5563852A

    公开(公告)日：1996-10-08

    申请号：US350317

    申请日：1994-12-05

    申请人： Yoshiteru Murakami ,  Naoyasu Iketani ,  Akira Takahashi ,  Kenji Ohta

    发明人： Yoshiteru Murakami ,  Naoyasu Iketani ,  Akira Takahashi ,  Kenji Ohta

    IPC分类号： C23C14/18 ,  C23C14/34 ,  C23C14/56 ,  G11B11/105 ,  G11B5/66

    CPC分类号： C23C14/3414 ,  C23C14/185 ,  C23C14/568 ,  G11B11/10582 ,  G11B11/10586 ,  G11B11/10589

    摘要： A magneto-optical recording medium includes a readout layer has in-plane magnetization at room temperature and in which a transition occurs from in-plane magnetization to perpendicular magnetization when temperature thereof is raised, and a recording layer for recording thereon information. The composition of the readout layer varies in a direction perpendicular to the surface thereof, and in the readout layer, the Co density on the light incident side is higher than the Co density on the interface between the readout layer and the recording layer. Therefore, the Curie temperature on the reproducing light incident side of the readout layer is high and the the polar Kerr rotation angle in reproducing increases, thereby achieving improvements in a reproducing signal quality. On the other hand, since the Curie temperature on the interface is low, the shift of the threshold temperature at which a transition occurs from in-plane to perpendicular by the magnetic interaction between the layers can be suppressed, thereby achieving a high quality reproducing signal without changing the laser power required for reproduction very much.

    摘要翻译： 磁光记录介质包括读出层，其在室温下具有面内磁化，并且其温度升高时从面内磁化转变为垂直磁化，并且在其上记录信息的记录层。 读出层的组成在垂直于其表面的方向上变化，在读出层中，光入射侧的Co密度高于读出层与记录层之间的界面上的Co密度。 因此，读出层的再现光入射侧的居里温度高，再现时的极性克尔旋转角度增加，从而实现再现信号质量的改善。 另一方面，由于界面的居里温度低，所以可以抑制通过层之间的磁相互作用从平面到垂直发生的阈值温度的偏移，从而实现高质量再现信号 而不需要更改再生所需的激光功率。