| 摘要 |
PROBLEM TO BE SOLVED: To provide optical equipment which is constituted so that dust arising in a closed space formed between optical parts can be easily removed. SOLUTION: A focusing screen 5, a visual field mask 9, a condenser lens 11 and a pentagonal prism 13 are successively arranged in each prescribed position on a mirror box 2. The closed space 27 is formed between the condenser lens 11 and the pentagonal prism 13, and two grooves 20c and 20d formed in a part of the mirror box 2 communicate with the closed space 27, and holes 20a and 20b are formed so as to pass through the wall of the mirror box 2 while communicating with the two grooves. Besides, an air flow direction changing member 28 for changing the flowing direction of the guided air is arranged with a prescribed inclination near one of the paths formed by the grooves 20c and 20d and the holes 20a and 20b.
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