| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-performance mirror in which a part of a plane mirror can change into a concave mirror.SOLUTION: The invented mirror, formed with a part which is changed into a concave mirror on a plane mirror, is characterized by having a plane and a dent 3 formed in the plane face, having a mirror plane sheet 7 whose curvature can be spread into an airtight condition on a plane of a base 2 which is formed with a level difference part 4 corresponding to the part 4 changing to the front concave mirror in the dent 3 and forming an airtight space S with the mirror plane sheet 7, the dent 3 and the level difference part, forming a hole 8 which leads to the airtight space in the base 2 and letting out/in air through the hole 8 with a decompression device. |
