OPTICAL RECORDING MEDIUM PREHEAT BULK ERASE APPARATUS, OPTICAL RECORDING MEDIUM PREHEAT BULK ERASE METHOD, AND OPTICAL RECORDING MEDIUM

摘要

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 medium10 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.