| 摘要 |
<p>An article for the recording and storage of information includes a support and a layer for storing information provided on the support. The layer is amorphous and composed of a mixture which includes an element of the group bismuth, antimony and selenium and a different element of the group selenium and tellurium. Information may be recorded on the layer by burning away selected regions thereof with high-energy radiation such as a laser beam. A preferred mixture includes bismuth and selenium with the weight ratio of bismuth to selenium being between about 1:2.5 and 1:3.5 for radiation having a wavelength corresponding to visible blue light and with the proportion of selenium being increased for longer wavelengths such as those corresponding to visible green and red light. The layer has a thickness which corresponds to a fraction of the wavelength of the radiation used for recording and the layer is optically opaque. A coating of lacquer may be applied over the layer prior to and/or subsequent to the recording operation so as to protect the layer. The layer is advantageously formed by vapor-depositing the elements selected from the above-mentioned groups onto the support simultaneously.</p> |
