| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a composition for producing a layer, which has strong adhesiveness and wiping stability and repels water and dirt, on alkaline earth metal fluoride and an alkali metal fluoride layer.SOLUTION: The method for producing a hydrophobic layer on an optical substance, which has an alkaline earth metal fluoride or alkali metal fluoride layer as the outermost layer or comprises alkaline earth metal fluoride or alkali metal fluoride, comprises a step of performing thermal vapor deposition by using polyfluorocarbon in a high vacuum. |
