| 摘要 |
<p>1407081 Optical components HOYA LENS CO Ltd 30 Aug 1972 [1 Sept 1971] 40181/72 Heading G2J An optical component, e.g. a spectacle lens, comprises a substrate 1 made of plastics material e.g. of polycarbonate, and a coating 2 which is 1Á-10Á thick and is of a vitreous material consisting essentially of silicates SiO, SiO 2 or mixtures thereof, the coating being applied by evaporation to a convex surface of the substrate, but not to any concave surface.</p> |
