摘要:
The primary mirror support structure comprises an EL rotation structure (2) including two arc-shaped members (2a), a structure frame (6), and a primary mirror support structure (7). The are-shaped members (2a) face each other via the EL axis supporting the primary mirror (1), each of which rotates about the EL axis along an outer surface so as to rotate the primary mirror (1) about the EL axis. The truss structure frame (6) is connected to either one of the are-shaped members (2a) at the ends. The primary mirror support structure (7) includes multiple support members (7a, 7b) connecting multiple points on the circumference of the primary mirror (1) provided above the structure frame (6) to the truss structure frame (6). At least the support members (7b) nearest to the arc-shaped members (2a) are connected to the truss structure frame (6) at parts (6a) different from the ends at which the truss structure frame (6) is connected to the arc-shaped members (2a),