| 摘要 |
PROBLEM TO BE SOLVED: To make a configuration small in a filter change-over structure and to improve space efficiency by selectively inserting an invisible light transmitting filter to an optical path and arranging the filter at a position being adjacent to an image forming lens in the case the filter is inserted into the optical path. SOLUTION: An infrared-ray cut filter 10a and an invisible light cut filter 10b are fixedly held by an optical filter holding frame 19 nearly orthogonally to an optical axis. The frame 19 is provided with two guide holes 19a, they are respectively fitted to guide bars 18a which is integrally formed with a main body and the frame 19 is slid in a filter change-over direction along the guide bars 18a and moved. Thus, the guide holes 19a are arranged at the outer side of the optical filters 10a and 10b so that the optical path is not obstructed. Besides, the enough distance between the guide holes is obtained so that an excellent guide mechanism is compactly constituted.
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