PURPOSE: To obtain an optical disk suitable for a novel recording medium by determining the irradiation power of a light beam for erasure by the function of the reflectivity of light from a metal or alloy.
CONSTITUTION: The metal or alloy which makes crystal-crystal transfer before or after recording is used as a recording medium. The recording is realized by the light irradiation of high-output short pulses and the erasure by the light irradiation of low-output long pulses. The specified relation between the record ing and erasing powers is required in order to obtain the stable recording and erasing characteristics. The inter-crystal transfer alloy consists preferably of the alloy composed of at least one kind of the group Ib element of periodic table and at least one kind selected from the group IIb W group Vb elements. An optical disk device 1 has a laser light source system 10 which emits at least ≥2 laser beams and executes the changing (recording or erasing) or read ing out of the recorded contents on a disk by irradiating the disk 40 supported by a disk supporting system 50 via a beam splitter 20. The signal is reproduced by a detector 30.
SHIMADA SATOSHI
SASAKI HIROSHI
MIYAMOTO NORIFUMI
TSUBOI NOBUYOSHI
NIHEI HIDEKI
WATANABE RYUJI
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