| 摘要 |
PROBLEM TO BE SOLVED: To improve concealment effect on poor appearance such as a bulge and a dent, and the visibility of a mark while enhancing dirt-removing performance, in a serration provided on a side wall surface. SOLUTION: A decorating belt 4 of the serration 3 provided on the side wall surface 2S is virtually divided into an inner area 4i and an outer area 4o. A ridge 6 forming the serration 3 is made from a ridge inner area portion 6i extending to a border K with the outer area 4o without decreasing an outward opening angleαin a radial direction to a radial line T; and a ridge outer area portion 6o curving at the border K, extending in a radial outward direction while decreasing the opening angleα, and having a width expanding portion 8 making a distance D of a recessed portion 7 between the ridges by extending in the radial direction. COPYRIGHT: (C)2004,JPO
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