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AssigneeSony Corporation
InventorsAtsushi Fukumoto, Toshiki Udagawa, Shunji Yoshimura, Masumi Ono, Kouichi Yasuda
Estimating the term…
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, when the line recording density of the recording medium is changed, the size of the effective reproducing region is controlled to an optimum value conforming to the line recording density to assure a stable reproducing state. To this end, with the magneto-optical disc 11 for example, being rotated at a constant angular velocity, a detecting unit 17 is provided for detecting the radial position of the magneto-optical disc 11 and the laser power as well as the external magnetic field is controlled depending on an output of the detecting unit 17 for controlling the size of an effective reproducing region to an optimum value conforming to the line recording density at each reproducing position.
A method for reproducing an optical recording medium comprising a recording layer and reproducing layer, said recording and reproducing layers being magnetically coupled to each other in steady state, said method comprising:
A method for reproducing as optical recording medium having a recording layer and a reproducing layer, said method comprising aligning the domains of the reproducing layer, transcribing the recording information to said reproducing layer and relieving the transcribed information, said recording information being held before transcription by a region on said recording layer the temperature of which is increased by irradiation with a readout during reproduction, and reading said recording information from the relieved region of said reproducing layer, said method further comprising detecting a reproducing position for a data bit on said optical recording medium when rotating said optical recording medium at a constant rotational velocity for reproduction, and controlling the size of a relieved region in accordance with a line recording density at said reproducing position.
A method for reproducing an optical recording medium comprising radiating a readout beam to an optical disc on which phase pits are formed in accordance with signals and which is changed in reflectance with changes in temperature, and reading said phase pits while partially changing the reflectance within a scanning spot of said readout light beam, said method further comprising
Dependencies are inferred from the claim text.