PURPOSE: To obtain an optical recording medium which can repeatedly record and reproduce information at high sensitivity, high speed, high S/N, and low error rate by providing a 1st thin film consisting of at least one kind of group Ib elements and the 2nd thin film consisting of at least one kind of group IVb elements on a base.
CONSTITUTION: The 1st thin film 2 consisting of the group Ib elements and the 2nd thin film 3 consisting of the group IVb element are provided on the base. The 1st thin film and the 2nd thin film are melted and mixed when a light beam for recording is projected on the recording medium. The light reflectivity of the mixed part is thereby largely changed from the original state before the mixing. The light beam for reproducing of such a small output which does not affect the properties of both the 1st and 2nd thin films is, therefore, projected on this recording medium and the change rate of the light reflectivity of the above-mentioned mixed part is detected at the time of reproduction. The light beam of about the middle output to separate the mixed elements of the group Ib and the group IVb is projected on the mixed part to heat said part to a low temp. and to separate the mixed elements of the mixed part at the time of erasing. The information is thereby repeatedly recorded and reproduced at the high sensitivity, high speed, high S/N and low error rate.
HARIGAI MASATO
TANI KATSUHIKO
CHIBA ERIKO
| JPS62204442A | 1987-09-09 | |||
| JPS62183042A | 1987-08-11 |
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