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。

公开(公告)号：US5053611A

公开(公告)日：1991-10-01

申请号：US287053

申请日：1988-12-21

申请人： Akira Takahashi ,  Yoshiteru Murakami ,  Junichiro Nakayama ,  Kenji Ohta ,  Hiroyuki Katayama ,  Michinobu Mieda

发明人： Akira Takahashi ,  Yoshiteru Murakami ,  Junichiro Nakayama ,  Kenji Ohta ,  Hiroyuki Katayama ,  Michinobu Mieda

IPC分类号： G11B11/10 ,  G11B7/0033 ,  G11B11/105 ,  G11B17/34

CPC分类号： G11B11/10565 ,  G11B11/10556 ,  G11B11/1056 ,  G11B11/10563 ,  G11B17/34 ,  G11B7/0033

摘要： A recording and reproducing device for a magneto-optical card includes an optical head for irradiating a magneto-optical recording medium of a magneto-optical card placed into the device with a laser beam. A magnetic field generator applies a biased magnetic field to the magneto-optical recording medium, and an optical system manipulating mechanism for the optical system of the above-mentioned optical head varies the spot irradiated by the laser beam. The optical head is fixed to the main frame of the device. The magneto-optical card is also supported where it is irradiated by the laser beam emitted from the optical head. The magneto-optical card is moved in a plane parallel to the surface of the magneto-optical card for rough searching and then a part of or the whole magnetic field generator is moved to come into contact with the magneto-optical card to stop the vibration of the magneto-optical card. The spot to be irradiated by the laser beam is then varied by means of the optical system of the optical head.

公开(公告)号：US5059473A

公开(公告)日：1991-10-22

申请号：US308018

申请日：1989-02-09

申请人： Akira Takahashi ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junichiro Nakayama ,  Tomoyuki Miyake ,  Kenji Ohta

发明人： Akira Takahashi ,  Michinobu Mieda ,  Yoshiteru Murakami ,  Junichiro Nakayama ,  Tomoyuki Miyake ,  Kenji Ohta

IPC分类号： G11B7/24 ,  G11B7/26 ,  G11B11/10 ,  G11B11/105

CPC分类号： G11B11/10584 ,  G11B7/26 ,  Y10S430/146 ,  Y10T428/239 ,  Y10T428/24529 ,  Y10T428/31507

摘要： An optical recording medium, which is used as an optical disc, optical card or the like for optically recording, reproducing, erasing and the like, includes a center substrate having formed on at least one side thereof recesses and/or protrusions. Recording films are formed on both sides thereof and transparent protective plates bonded to these recording films respectively. This arrangement substantially eliminates warping of the substrates constituting the optical recording medium and exfoliation of substrates or the like even when the optical recording medium is subjected to sudden changes in temperature. This optical recording medium demonstrates enhanced optical performance and protective effect. The selecting of the transparent protective plate is simplified because the forming recesses and/or protrusions is not a factor. By producing an optical recording medium utilizing the above features, the carrier-to-noise ratio and isotropy of the medium is improved.

公开(公告)号：US5081614A

公开(公告)日：1992-01-14

申请号：US577817

申请日：1990-09-04

申请人： Akira Takahashi ,  Toshihisa DeGuchi ,  Yoshiteru Murakami ,  Michinobu Mieda ,  Kazuo Van ,  Kenji Ohta ,  Hiroyuki Katayama ,  Tomoyuki Miyake

发明人： Akira Takahashi ,  Toshihisa DeGuchi ,  Yoshiteru Murakami ,  Michinobu Mieda ,  Kazuo Van ,  Kenji Ohta ,  Hiroyuki Katayama ,  Tomoyuki Miyake

IPC分类号： G11B7/12 ,  G11B7/135 ,  G11B11/105

CPC分类号： G11B11/10532 ,  G11B7/12 ,  G11B7/1381

摘要： A magneto-optical head wherein a light flux, which is reflected from a recording medium, is separated into its central portion and remaining portion. The central light flux portion is only used as a magneto-optical signal while the remaining light flux portion is only used as an optical servo signal.

摘要翻译： 一种磁光头，其中从记录介质反射的光束被分离成其中心部分和剩余部分。 中央光束部分仅用作磁光信号，而剩余光通量部分仅用作光伺服信号。

公开(公告)号：US5530685A

公开(公告)日：1996-06-25

申请号：US330744

申请日：1994-10-28

申请人： Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi ,  Kenji Ohta

发明人： Hiroyuki Katayama ,  Junichiro Nakayama ,  Michinobu Mieda ,  Junji Hirokane ,  Akira Takahashi ,  Kenji Ohta

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

CPC分类号： G11B11/10554 ,  G11B11/10521 ,  G11B11/10523 ,  G11B11/10552

摘要： A magneto-optical recording apparatus of the present invention is provided with an objective lens for focusing a light beam onto a magneto-optical recording medium. A pair of magnets is disposed on opposite sides of the magneto-optical recording medium and apply a writing magnetic field onto a portion of the magneto-optical recording medium that has been irradiated by the light beam while applying an initializing magnetic field greater than the writing magnetic field onto a portion apart from that irradiated by the light beam.

摘要翻译： 本发明的磁光记录装置设置有用于将光束聚焦到磁光记录介质上的物镜。 一对磁体设置在磁光记录介质的相对侧上，并将写入磁场施加到已经被光束照射的磁光记录介质的一部分上，同时施加大于写入的初始化磁场 磁场到除了被光束照射的部分之外的部分。

公开(公告)号：US4786559A

公开(公告)日：1988-11-22

申请号：US945354

申请日：1986-12-22

申请人： Yoshiteru Murakami ,  Akira Takahashi ,  Hiroyuki Katayama ,  Tomoyuki Miyake ,  Kenji Ohta ,  Michinobu Mieda

发明人： Yoshiteru Murakami ,  Akira Takahashi ,  Hiroyuki Katayama ,  Tomoyuki Miyake ,  Kenji Ohta ,  Michinobu Mieda

IPC分类号： G11B5/64 ,  G11B11/105 ,  G11B7/24

CPC分类号： G11B5/64 ,  G11B11/10586 ,  Y10S428/90

摘要： A magnetooptical storage element comprising a recording layer of a multi-layered structure including a reflecting film, said reflecting film being made of metals or metalloids having a low thermal conductivity coefficient.

摘要翻译： 一种磁光存储元件，包括包括反射膜的多层结构的记录层，所述反射膜由具有低导热系数的金属或准金属制成。

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：US06665235B2

公开(公告)日：2003-12-16

申请号：US10214881

申请日：2002-08-08

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： G11B11/10586 ,  B60T1/005 ,  F16D63/00 ,  G11B7/00718 ,  G11B7/126 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/10517 ,  G11B11/10543 ,  G11B11/10595

摘要： Featured is a recording and reproducing method of a magneto-optical recording medium including a recording layer for recording thereon information magneto-optically and a readout layer which has in-plane magnetization at room temperature and where a transition occurs from in-plane magnetization to perpendicular magnetization as temperature raises. The method includes projecting a light beam onto such a magneto-optical recording medium so as to form a perpendicularly magnetized area in the readout layer by duplication of the magnetization of said recording layer to the area. In further embodiments, the recording medium further includes an intermediate layer made of non-magnetic film formed between the readout and recording layers and the readout and recording layers are composed of rare-earth transition metal alloys such as TbFeCo (recoding layer) readout layer, made of GdFeCo (readout layer).

摘要翻译： 特别是磁光记录介质的记录和再现方法，其包括用于在其上记录磁光信息的记录层和在室温下具有面内磁化的读出层，并且其中从面内磁化转变为垂直 磁化随温度升高。 该方法包括将光束投影到这种磁光记录介质上，以便通过将所述记录层的磁化复制到该区域而在读出层中形成垂直磁化区域。 在另外的实施例中，记录介质还包括由读出和记录层之间形成的非磁性膜制成的中间层，并且读出和记录层由稀土过渡金属合金如TbFeCo（记录层）读出层， 由GdFeCo（读出层）制成。

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。

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。