| 摘要 |
PURPOSE: To obtain vapor deposited stock for production of an optical coating, having a high refractive index by a vacuum vapor deposition method by which the uniform coating is produced by using the special stock. CONSTITUTION: The stock is a compd. of the formula La2 Ti2 O7-x (where (x) is from 0.3 to 0.7). The stock may be evaporated without problems in vacuum and without blowing-out and yields the coating, having no absorption under ordinary operating conditions of a vacuum evaporation method, without making any special remedy. The vapor deposited stock contains oxygen in a quasi- stoichiometric quantity, as compared with basic compd. lanthanum titanate La2 Ti2 O7-x having a strictly stoichimetric compsn. The reason for the deliberate setting of the quasi-stoichiometric oxygen quantity in the stock lies in that, on the one hand, the liberation of the oxygen giving rise to the undesirable blowing-out of the molten stock during vacuum evaporation is not induced. On the other hond, the coating free from the absorption is formed, without the special remedy under the ordinary operating conditions of the vacuum evaporation method within the range, where the quasi-stoichiometric quantity of the oxygen is selected. |
