| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical article having high dust-proof performance. <P>SOLUTION: Dust-proof glass 10 has a multilayer inorganic thin film 2 on a substrate 1. The inorganic thin film 2 is formed by laminating a plurality of layers made of silicon oxide 2A and a plurality of layers made of metal oxide 2B, the metal oxide is metal oxide containing any one of zirconium, tantalum and titanium, the layers made of silicon oxide 2A include a low-density silicon oxide layer and a high-density silicon oxide layer having a density higher than that of the low-density silicon oxide layer, an outermost layer 2S of the inorganic thin film 2 is the low-density silicon oxide layer and surface roughness of the outermost layer 2S of the inorganic thin film 2 is equal to or greater than 0.55 nm and equal to or smaller than 0.70 nm. <P>COPYRIGHT: (C)2011,JPO&INPIT |
