| 摘要 |
PROBLEM TO BE SOLVED: To obtain a structure of securing required strength and rigidity when an optical mirror is enlarged while reducing weight.SOLUTION: The optical mirror includes: a face plate on which a mirror surface is formed; a back plate; and a core joined between the face plate and the back plate. The core includes: a center plate facing each other between the face plate and the back plate; a face plate side rib erected on the face plate side from the center plate; and a back plate side rib erected on the back plate side from the center plate. |
