| 摘要 |
An optical disk is formed by stacking a polycarbonate substrate with a first protective layer of amorphous silicon, a recording layer of an InSb alloy, and a second protective layer of an ultraviolet-setting resin, in the order named. The first and second protective layers are formed by sputtering and spin-coating, respectively. After the recording layer of the optical disk, formed in this manner, is subjected to initial crystallization, a light beam is applied to the recording layer. Thereupon, the irradiated portion of the recording layer undergoes phase transformation, thus forming recording marks in different crystal phases. Information is read by applying a weak laser beam to the recording layer with the recording marks therein. As the recording marks are cooled gradually by being exposed to a laser beam, they undergo phase transformation, so that the information is erased.
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