| 摘要 |
PROBLEM TO BE SOLVED: To prevent interference fringes and black spots by a simple structure and to obtain a high quality image by specifying the interval of peaks and the max. height of the surface toughness of the anodically oxidized layer and specifying the surface gloss. SOLUTION: The surface of an aluminum supporting body is anodically oxidized, and the surface of the anodically oxidized layer has 0.3 to 250μm peak interval, preferably 30 to 100μm, and 0.5 to 2.5μm max. height, preferably 0.7 to 1.8μm. The surface gloss of the anodically oxidized surface is controlled to >=60 gloss, preferably >=80 gloss. If the peak interval is <0.3μm, interference fringes can not be suppressed enough. If the interval exceeds 250μm, irregularity as stripes is caused. If the max. height is <0.5μm, interference fringes can not suppressed enough, and if it exceeds 2.5μm, irregularity as stripes is caused. If the gloss is <60 gloss, an enough effect to suppress black spots for a white copy image can not be obtd.
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