| 摘要 |
PROBLEM TO BE SOLVED: To enable a light beam intruding the inside of a shutter and focusing unit having a moving photographing lens inside to be surely shielded without making the diameter of a lens barrel large-sized. SOLUTION: A lens holding frame 21 holding the photographing lens 20 moved forward and backward is arranged in the shutter and focusing unit 11 having a shutter bottom board 13 and a supporting bottom board 28 at both end parts. By attaching and fixing a freely elongating and contracting hollow cylindrical light shielding rubber barrel 36 whose inside diameter is smaller than the outside diameter of the unit 11 to an outside circumference between the boards 13 and 28, the light beam intruding from a gap between the outside circumference of the frame 21 and the aperture part 28a of the board 28 is shielded.
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