| 摘要 |
PURPOSE:To restrain the occurrence of an impulse force of the turning of a mirror and to separate a mirror driving mechanism from a mirror tilt adjusting mechanism by constituting a mirror frame in order to go forward and backward in a photographing optical path with the aid of the actuations of a mirror frame lock lever, a driving lever and a trigger lever. CONSTITUTION:By turning the trigger lever 37 counterclockwise, the engagement with the driving lever 33 is released so as to turn the lever 33 clockwise and by engaging the hook part 36a of the mirror frame lock lever 36 with a mirror frame hook part 32a, mirror frame 32 and a mirror 1 are turned clockwise so as to save them outside the photographing optical path. At the time of completing an exposure, the end part 36b of the lock lever abuts on an abutting member 41 so as to release the engagement of the end part 36a with the mirror frame hook part 32a and the frame 32 returns to an initial position with energizing f1. Therefore, inertial mass can be reduced and the impulse of he turning of the mirror can be prevented so as to accelerate the turning of the mirror because the mirror driving mechanism is separated from the mirror tilt angle adjusting mechanism.
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