| 摘要 |
PROBLEM TO BE SOLVED: To provide a polygon mirror having a structure capable of varying to an ideal state corresponding to using conditions at any time. SOLUTION: Three kinds of mirrors, namely, a convex mirror 4, a concave mirror 5 and a plane mirror 6, are combined, so as to be each face of a triangular prism, respectively. The curved surface is changed by pushing or pulling a part where the convex mirror 4 and the concave mirror 5 are combined. |
