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AssigneeSony Corporation
InventorsAtsushi Fukimoto, Toshiki Udagawa, Shunji Yoshimura, Masumi Ono, Kouichi Yasuda
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A method for reproducing a magneto-optical recording medium the recording pits of which are erased or relieved with rise in temperature of the recording medium caused by radiation of a readout beam, or an optical recording medium the reflectance of which is changed with rise in temperature of the recording medium caused by radiation of the readout beam, in which changes in the size of an effective reproducing region due to the temperature of the magneto-optical or optical recording medium may be inhibited. To this end, a temperature sensor 20 for sensing the temperature of the magneto-optical disc 11, for example, is provided and the laser power or the external magnetic field is controlled depending on the detected temperature by the temperature sensor 20 to maintain a constant size of the effective reproducing region at all times.
A method for reproducing an optical recording medium comprising a recording layer and a reproducing layer, said recording and reproducing layers being magnetically coupled to each other in steady state, said method comprising rendering recorded data unreadable by extinguishing magentic coupling between the recording layer and the reproducing layer in a region the temperature of which is raised to a temperature higher than a predetermined temperature by irradiation of a readout laser beam during reproduction, and reading the recording information held by said recording layer in an area of an irradiated region other than the magnetic coupling extinguished region, characterized by
A method for reproducing an optical recording medium comprising a recording layer and a reproducing layer, said method comprising the steps of aligning domains of said reproducing layer, transcribing the recording information held by said recording layer in a region of the recording medium in which the temperature is raised to a temperature higher than a predetermined temperature by irradiation of a readout beam during reproduction for relieving the transcribed recording information by rendering said recording information readable, within a relieved region, and reading out the recording information from said relieved region of said reproducing layer, characterized by detecting the temperature of an irradiated portion of said optical recording medium, and
A method for reproducing an optical recording medium having phase pits formed thereon in accordance with signals and having its reflectance changed with temperature, said method comprising radiating a readout beam to the recording medium, and reading out said phase pits while partially changing the reflectance within a scanning spot of a readout beam, characterized by
Dependencies are inferred from the claim text.