| 摘要 |
<p>PURPOSE:To shield a viewfinder from reverse incident light completely by cutting the transmission of main mirror driving force after a submirror follows and coincides with a main mirror in the middle of the elevation of the main mirror, and then moving the main mirror by the pressing of the submirror. CONSTITUTION:A hold lever 10 for supporting a main mirror rotating shaft 8a rotates counterclockwise by the upward rotation of a mirror driving shaft 40 and the main mirror 4 rotates upwardly while moving back. A driving cam 44, on the other hand, moves up together with the shaft 40 to press the driven shaft 34 of a submirror holder 20 down to left from the flection point of an end surface 44a with its lower part, rotating the holder 20 in a closing direction to a main mirror holder 6. As it further moves, the shaft 34 moves onto the upper part higher than the flection point of the end surface 44a to superpose the submirror and then the speed of the elevation by the pressing of the shaft 34 is faster than that by the shaft 40 thereafter, so the driving force of the shaft 40 is not transmitted to the holder 6.</p> |
