| 摘要 |
<P>PROBLEM TO BE SOLVED: To increase a resonance frequency while improving the rigidity of a projected part. Ž<P>SOLUTION: The projected part 110 formed by combining triangular flat surfaces 112 (flat surfaces of identical isosceles triangles) to have an angle is formed on a floor panel 100. The projected part 110 is peripherally surrounded by a flat surface 104. The floor panel 100 has higher resonance frequency than the construction without the projected part 110, thereby reducing uncomfortableness to an occupant. The rigidity of the projected part 110 is considerably increased compared to the projected part entirely formed in a curved surface. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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