| 摘要 |
PROBLEM TO BE SOLVED: To restrict separation of a warping prevention member against a receiving portion of the panel main body with aging and maintain a flatness accuracy over a long period of time. SOLUTION: An entrance door 10 is constituted of a panel main body 12 and a warp prevention member 13 restricting a warping deformation of the panel main body 12 caused by environmental difference between the inside and outside. The warp prevention member 13 has a long piece-shaped external shape almost along the inner shape of a recessed gutter 20 and is arranged in a manner permitting pressure welding. That is, the side end portion 24 of the warp prevention member 13 has a corrugated blade shape with recessed and projected portions 26 and 27 formed continuously, the projected portion 27 is pressure welded to the inner side surface 20A as a part of the inner surface of the recessed gutter 20 and is interlocked with its inner side surface 20A. COPYRIGHT: (C)2004,JPO
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