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    11.
    发明专利
    未知

    公开(公告)号：DE69231042D1

    公开(公告)日：2000-06-15

    申请号：DE69231042

    申请日：1992-02-07

    Applicant: SONY CORP

    Inventor： OHTA MASUMI ,  NAKAO ISAMU ,  UDAGAWA TOSHIKI ,  FUKUMOTO ATSUSHI ,  YOSHIMURA SHUNJI

    IPC: G11B11/105 ,  G11B19/12 ,  G11B11/10

    Abstract: The present invention concerns an apparatus for recording and/or reproducing on/from a magneto-optical recording medium (10). This apparatus comprises means (62) for generating a first channel clock used to write and/or read data in and/or from a first magneto-optical recording medium (10). The first magneto-optical recording medium (10) has a recording layer (13), the reproducing layer (11) and an intermediate layer (12) for magnetically coupling the recording layer (13) the reproducing layer (11) in stationary state, in which a magnetic coupling between said recording layer (13) and said reproducing layer (11) is lost in area (14) in which the temperature is increased to be higher than a predetermined temperature by the radiation of a light upon reproducing and in which a recorded information held on said recording layer (13) is read out from said reproducing layer (11) in the radiated area (5) except the area (14) in which said magnetic coupling is lost. Furthermore, the apparatus comprises means (62) for generating a second channel clock used to write and/or read data in and/or from a second magneto-optical recording medium (10) in which a recorded information is reproduced by using substantially whole area of the radiated area (5). Moreover, the apparatus comprises a discriminating means (70) for discriminating said first magneto-optical recording medium (10) and the second magneto-optical recording medium (10) and means (40) for switching first and second channel clocks in response to a discriminating signal from said discriminating means (70).

    MAGNETO-OPTICAL RECORDING MEDIUM
    13.
    发明专利
    MAGNETO-OPTICAL RECORDING MEDIUM 未知

    公开(公告)号：CA2060549A1

    公开(公告)日：1992-08-09

    申请号：CA2060549

    申请日：1992-02-03

    Applicant: SONY CORP

    Inventor： OHTA MASUMI ,  NAKAO ISAMU ,  ARATANI KATSUHISA ,  NAKAOKI ARIYOSHI ,  KANEKO MASAHIKO

    IPC: G11B11/10 ,  G11B5/84 ,  G11B11/105

    Abstract: A magneto-optical recording medium has at least a reproducing layer and a recording layer which are magnetically coupled with each other. The reproducing layer permits recorded signals to be read out according to its change in state of magnetization. The reproducing layer has a thickness in a range from 150.ANG. to 1000.ANG.. Additionally, the magneto-optical recording layer has a layer of a good heat conductor attached thereto. Furthermore, the reproducing layer or the auxiliary reproducing layer is formed of layers of rare earth metal and layers of transition metal which are laminated in alternating fashion.

    15.
    发明专利
    未知

    公开(公告)号：DE69225159T2

    公开(公告)日：1998-08-13

    申请号：DE69225159

    申请日：1992-02-07

    Applicant: SONY CORP

    Inventor： OHTA MASUMI ,  NAKAO ISAMU ,  UDAGAWA TOSHIKI ,  FUKUMOTO ATSUSHI ,  YOSHIMURA SHUNI

    IPC: G11B11/105 ,  G11B19/12 ,  G11B11/10

    Abstract: The present invention concerns an apparatus for recording and/or reproducing on/from a magneto-optical recording medium (10). This apparatus comprises means (62) for generating a first channel clock used to write and/or read data in and/or from a first magneto-optical recording medium (10). The first magneto-optical recording medium (10) has a recording layer (13), the reproducing layer (11) and an intermediate layer (12) for magnetically coupling the recording layer (13) the reproducing layer (11) in stationary state, in which a magnetic coupling between said recording layer (13) and said reproducing layer (11) is lost in area (14) in which the temperature is increased to be higher than a predetermined temperature by the radiation of a light upon reproducing and in which a recorded information held on said recording layer (13) is read out from said reproducing layer (11) in the radiated area (5) except the area (14) in which said magnetic coupling is lost. Furthermore, the apparatus comprises means (62) for generating a second channel clock used to write and/or read data in and/or from a second magneto-optical recording medium (10) in which a recorded information is reproduced by using substantially whole area of the radiated area (5). Moreover, the apparatus comprises a discriminating means (70) for discriminating said first magneto-optical recording medium (10) and the second magneto-optical recording medium (10) and means (40) for switching first and second channel clocks in response to a discriminating signal from said discriminating means (70).

    16.
    发明专利
    未知

    公开(公告)号：DE69225252D1

    公开(公告)日：1998-06-04

    申请号：DE69225252

    申请日：1992-02-06

    Applicant: SONY CORP

    Inventor： OHTA MASUMI ,  NAKAO ISAMU ,  ARATANI KATSUHISA ,  NAKAOKI ARIYOSHI ,  KANEKO MASAHIKO

    IPC: G11B11/10 ,  G11B5/84 ,  G11B11/105

    Abstract: A magneto-optical recording medium has at least a reproducing layer and a recording layer which are magnetically coupled with each other. The reproducing layer permits recorded signals to be read out according to its change in state of magnetization. The reproducing layer has a thickness in a range from 150 ANGSTROM to 1000 ANGSTROM . Additionally, the magneto-optical recording layer has a layer of a good heat conductor attached thereto. Furthermore, the reproducing layer or the auxiliary reproducing layer is formed of layers of rare earth metal and layers of transition metal which are laminated in alternating fashion.

    18.
    发明专利
    未知

    公开(公告)号：AT151907T

    公开(公告)日：1997-05-15

    申请号：AT92102084

    申请日：1992-02-07

    Applicant: SONY CORP

    Inventor： NAKAO ISAMU ,  FUKUMOTO ATSUSHI ,  UDAGAWA TOSHIKI ,  YOSHIMURA SHUNJI

    IPC: G11B11/10 ,  G11B11/105 ,  G11B13/04

    Abstract: A method and apparatus for recording and reproducing information onto and from a magneto-optic recording medium (100) is disclosed. The magneto-optic recording medium (100) has at least a reproducing layer (110) and a recording layer (130). A recording optical head (51) records information on the magneto-optic recording medium (100). A reproducing optical head (61) has a reading light beam for reading information recorded in a region within a spot of the reading light beam by magneto-optic effect by changing a state of magnetization of the reproducing layer (110) and at the same time irradiating the recording medium (100) with the light beam. A wavelength of the recording light beam emitted by the recording optical head (51) is substantially smaller than a wavelength of the reading light beam emitted by the reading optical head. A minimum ratio of the wavelength of the recording light beam to that of the reproducing light beam is 1:3.

    19.
    发明专利
    未知

    公开(公告)号：DE69212656D1

    公开(公告)日：1996-09-19

    申请号：DE69212656

    申请日：1992-02-06

    Applicant: SONY CORP

    Inventor： OHTA MASUMI ,  NAKAO ISAMU ,  ARATANI KATSUHISA

    IPC: G11B11/10 ,  G11B11/105

    Abstract: A magneto-optic recording and reproducing medium is formed of a reproduction layer composed mainly of GdFeCo and having a saturation magnetization of at least 450 emu/cc and a coercive force of not more than 4 kOe, and a recording layer composed mainly of TbFeCo, having a coercive force of at least 5 kOe, and having a magnetization of not more than 300 emu/cc when it is a transition metal-predominant film and not more than 200 emu/cc when it is a rare earth-predominant film.

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