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AssigneeSharp Kabushiki Kaisha
InventorsAkira Takahashi, Yoshiteru Murakami, Junsaku Nakajima, Kenji Ohta
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A magneto-optical disk has a recording layer whereon recorded bits are formed by the magnetic field modulation method and a readout layer whose axis of easy magnetization is parallel to the recording layer at room temperature, and varies to be perpendicular to the recording layer within a predetermined temperature range between room temperature and the Curie temperature. During reproduction of the recorded bits the first semiconductor laser emits a heating-use light beam to form the first light spot on the readout layer Thus, a ring-shaped region corresponding to the predetermined temperature range exhibits perpendicular magnetic anisotropy and the recorded bits are copied from the recording layer onto the ring-shaped region. As the first light spot is shifted, the ring-shaped region as a readout window of recorded bits is also shifted. Further, the second semiconductor laser emits a reproduction-use light beam such that the second light spot is formed on the readout layer to overlap the first light spot at a rear portion thereof. Consequently, only one recorded bit copied onto the rear portion of the ring-shaped region can be reproduced; therefore, high-quality reproduced signals can be obtained from the magneto-optical disk having information recorded with high density.
An optical head device for reproducing information from a magneto-optical recording medium in combination therewith, said medium comprises a recording layer whereon information is magneto-optically recorded by a magnetic field modulation method and a readout layer with a Curie temperature that is substantially higher than that of the recording layer, the readout layer having a direction of magnetization that is a parallel to the recording layer at room temperature, and that changes to be perpendicular to the recording layer within a predetermined temperature range between room temperature and the Curie temperature,
An optical head device for reproducing information from a magneto-optical recording medium which comprises a recording layer whereon information is magneto-optically recorded by a magnetic field modulation method and a readout layer with a Curie temperature that is substantially higher than that of the recording layer, the readout layer having a direction of magnetizing that is parallel to the recording layer at room temperature, and that changes to be perpendicular to the recording layer within a predetermined temperature range between room temperature and the Curie temperature,
An optical head device for reproducing information from a magneto-optical recording medium which comprises a recording layer whereon information is magneto-optically recorded by a magnetic field modulation method and a readout layer with a Curie temperature that is substantially higher than that of the recording layer, the readout layer having a direction of magnetizing that is parallel to the recording layer at room temperature, and that changes to be perpendicular to the recording layer within a predetermined temperature range between room temperature and the Curie temperature,
An optical head device for reproducing information from a magneto-optical recording medium which comprises a recording layer whereon information is magneto-optically recorded by a magnetic field modulation method and a readout layer with a Curie temperature that is substantially higher than that of the recording layer, the readout layer having a direction of magnetizing that is parallel to the recording layer at room temperature, and that changes to be perpendicular to the recording layer within a predetermined temperature range between room temperature and the Curie temperature,
Dependencies are inferred from the claim text.