| 摘要 |
PROBLEM TO BE SOLVED: To maintain durability of a cylindrical mirror even through adjustment of a bow. SOLUTION: Even if a cylindrical mirror 38 is pressurized by screwing an adjusting screw 80 to actuate a bending stress with a hemispherical projection part 76, a reinforcing member 78 keeps a surface contact with the cylindrical mirror 38 along its curved posture. Accordingly, in the case of manufacturing errors of the cylindrical mirror 38, the force actuating from the hemispherical projection 76 onto the cylindrical mirror 38 is dispersed, preventing the stress from concentrating on a limited narrow area and thereby enabling the durability to be secured for the cylindrical mirror 38. COPYRIGHT: (C)2006,JPO&NCIPI
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