| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a reflection mirror in which a light reflecting film is formed using as a base layer, an aluminum oxide film base provided on a substrate made of an aluminum-based alloy, and in which exfoliation of the light reflecting film is suppressed even when the reflection mirror is applied to an illuminator. <P>SOLUTION: In the aluminum oxide film base 2 of the reflection mirror 1, an aluminum oxide film layer 22 is constituted so that an oxygen component ratio in the aluminum-based alloy may gradually decrease from a light reflecting film 3 side toward a substrate 21 side. Since there is no interface between the substrate 21 and the aluminum oxide film layer 22 to be the base of the light reflecting film 3 by this constitution, the substrate 21 and the aluminum oxide film layer 22 do not exfoliate from each other and adhesive strength with the light reflecting film 3 increases. Further since the aluminum oxide film base 2 is a radical oxide film, anodic oxidation treatment is unnecessary, a dense base having no porous generation or the like is formed, it is unnecessary to dip the aluminum oxide film base 2 in an electrolytic solution or the like and hence there is no risk of remaining of the electrolytic solution components in the aluminum oxide film base 2 causing exfoliation of the light reflecting film 3. <P>COPYRIGHT: (C)2008,JPO&INPIT |
