| 摘要 |
PROBLEM TO BE SOLVED: To prevent dust from infiltrating into a camera body when changing a lens unit. SOLUTION: In such a state that the lens unit is not attached to the camera body, a photographing aperture 25 is covered with an aperture part cover 31 at a covering position by energizing force of first and second torsion springs 44 and 45. When bayonet pawls 11 and 12 are rotated from an insertion position to a locking position, the side surfaces of the bayonet pawls 11 and 12 slide in contact with connection members 40 and 41, and move an upper plate 32 upward and a lower plate 33 downward, and then the aperture part cover 31 moves from the covering position to the opening position. When the bayonet pawls 11 and 12 are rotated from the locking position to the insertion position, the aperture part cover 31 moves from the opening position to the covering position by the energizing force of the first and the second torsion springs 44 and 45. Therefore, the dust is prevented from infiltrating into the camera body when changing the lens unit. COPYRIGHT: (C)2008,JPO&INPIT
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