| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent dew condensation of an optical means in an apparatus body. SOLUTION: An opening portion 302 for introducing ambient air is provided in the apparatus body 4. A heater 110 is disposed near mirrors 103, 104 and 105. In the apparatus body 4, an opening/closing member 501 is provided so as to be movable between a closed position for closing the opening portion 302 and an opened position for opening the opening portion 302. An actuator 502 elastically deformed according to heat is disposed near the heater 110. The actuator 502 is deformed by heating by the heater 110 and the opening/closing member 501 is moved from the opening position to the closing position. COPYRIGHT: (C)2010,JPO&INPIT |
