CPC C23C 14/30 (2013.01) [C23C 14/243 (2013.01)] | 12 Claims |
1. A method of physical vapor deposition for coating an optical surface of a spectacle lens, the method comprising:
providing a crucible containing a first evaporation material and a second evaporation material,
wherein the first evaporation material has a first vapor pressure and the second evaporation material has a second vapor pressure different from the first vapor pressure; and
concurrent evaporation of the first evaporation material and the second evaporation material from a same crucible,
wherein a ratio of an exposed surface of the first evaporation material and an exposed surface of the second evaporation material at a surface of the crucible is adapted to counterbalance a difference in vapor pressure between the first and the second evaporation material.
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