| 摘要 |
PROBLEM TO BE SOLVED: To obtain a film which develops sharp blue, green, bronze and gray tones by one coating process and to improve wear resistance and chemical resistance by incorporating gold, bismuth oxide or other oxides. SOLUTION: Gold develops a transmission tone of orange, red, purple and blue. When palladium and platinum are used with gold, they develop bronze and gray tones, respectively. The total content of noble metals is preferably controlled to >0 and <=20 at.% to the whole elements which constitute the colored film. Bismuth oxide gives gloss to the colored film and develops a sharp transmission color. The proportion of bismuth oxide is preferably controlled to >0 and <=10 at.% calculated as bismuth atoms to the whole elements which constitute the colored film. As for oxides except for bismuth oxide, silicon oxide and/or titanium oxide are preferably used. These oxides are incorporated so as to control the refractive index of the colored film and to obtain a desired transmission tone.
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