| 摘要 |
PROBLEM TO BE SOLVED: To achieve a structure having high rigidity, even in any of bending directions.SOLUTION: A metal plate 13 comprises a plurality of protrusions 14, 14 and a plurality of flat parts 15, 15 sectioned by the protrusions 14, 14. By causing longitudinally long protrusion elements 17, 17 and laterally long protrusion elements 18, 18 to be continuous in a zigzag form, the entire of the respective protrusions 14, 14 is formed in a wave shape like a roughly approximate sine wave. Each of the protrusions 14, 14 is disposed in such a state that the phases thereof match each other and in a vertically shifted state via each of the flat parts 15, 15. In such a state, the protrusions 14, 14 are disposed on a bending central line in an arbitrary position of each of the flat parts 15, 15. |
