Preheat bulk erasing device for phase-change type optical disk
AssigneeSony Corporation
InventorsHiroshi Nakayama, Atsushi Takeuchi, Junichi Nemoto, Hiroyuki Miura
Life of this patent
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Abstract
When carrying out magnetization, annealing, and initialization of a recording film by applying a laser beam to the recording film while rotating an optical recording medium 10 by a motor 11, light of a strong visible-light lamp 15 is projected as parallel light to a reflecting mirror 14 via a lens 16 so as to apply light reflected by the reflecting mirror 14 to an area wider than a spot of the laser beam on the medium 10 for heating. At that time, a control unit 18 controls an intensity of the strong visible-light lamp 15 to raise a temperature of the medium 10 to a temperature of 80° C. or higher and a softening point of a substrate or lower, for example.
Claims10
A preheating bulk erase device for an optical recording medium comprising:
- a heating unit;
- a rotating unit on which the optical medium is supported;
- and
- a laser unit,
- wherein,
- the preheat bulk erase device is configured to initialize a recording film layer of the optical recording medium by rotating the optical recording medium with the rotating unit while the heating unit heats the optical recording medium and the laser unit, simultaneously with the heating, applies a laser beam onto the recording medium, and
- the heating unit applies a light to an area on the optical recording medium wider than the laser beam.
Dependencies are inferred from the claim text.