| 摘要 |
<p>1491508 Optical recording ROBERT BOSCH GmbH 25 Nov 1974 [26 Nov 1973] 50904/74 Heading G5R An optically opaque layer which is to be selectively removed by vaporization or melting by a modulated high-energy light beam, e.g. from a laser, is made of a mixture of either bismuth or antimony with either selenium or tellurium, both elements of the mixture being sputtered simultaneously on to a base. The thickness of the layer, which may be protected by a coat of varnish, is small in comparison with the wavelength of the light beam, which also determines the optimum proportion of the mixture.</p> |
