| 摘要 |
PROBLEM TO BE SOLVED: To eliminate need for leaving a pentagonal mirror as it is for a long time until adhesive agent for fixing it is hardened and to prevent the positional deviation of the pentagonal mirror caused by the contraction,of the adhesive agent from occurring by interposing an elastic material between a protection cover fixed to a mirror box block and set for covering a roof reflector by leaving a fixed interval and the roof reflector. SOLUTION: The pentagonal mirror 20 is provided with the roof reflector 23 consisting of a pair of mutually orthogonally crossed plate parts 21 and 22 and constituted so that reflecting surfaces 21a and 22a are formed on the inside surface of the respective plates part 21 and 22 by the evaporation of aluminum or the like. Besides, the mirror 20 is provided with a reflector 25 having a reflecting surface reflecting light reflected on the reflection surfaces 21a and 22a toward an eyepiece side and constituted so that a foamed uretane piece(elastic material) 40 is stuck to a ridge part 24. Then, the mirror 20 is made to adhere to the left and the right side walls 15 and 16 of the mirror box block 10 by silicone bond B. Besides, the protection cover 50 covering the reflector 23 by leaving the fixed interval is fixed to the block 10 and the piece 40 is interposed between the cover 50 and the reflector 23. |
