OPTICAL SYSTEM SUPPORTING MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a technique as for a lightweight optical system supporting member which has high rigidity and a small thermal expansion coefficient. SOLUTION: The optical system supporting member is consisting of a metal- ceramics composite material using SiC powder of 40 to 80 vol.% as a reinforcing material, and an Al-Si-Mg based aluminum alloy as a matrix.