| 摘要 |
PROBLEM TO BE SOLVED: To adjust a picture projected to a screen without necessitating frequent maintenance while restraining cost by deforming a mirror to be concave or convex by utilizing the elastic force of the mirror. SOLUTION: A 1st supporting member 22 supporting the periphery part of the mirror 11 and a 2nd supporting member 12 supporting the center part of the mirror 11 from a back side are attached to the mirror 11. A bolt hole is formed on either-side surfaces of the members 22 and 12 so that one bolt 13 can be attached. Therefore, force to form a concave surface or a convex surface is easily given to the mirror 11 by the bolt 13. A part where the light radiated to the mirror 11 is spread is narrowed by making the mirror 11 concave, on the contrary, a part where the light radiated to the mirror 11 is narrowed is widened by making the mirror 11 convex. Thus, the light from a projector is reflected and the picture projected to the screen is corrected.
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