| 摘要 |
PROBLEM TO BE SOLVED: To easily change a lens with a lens shutter in a motor-driven type camera. SOLUTION: A light shielding curtain 1 is provided to be freely openably/ closably on the front surface of an image plane frame 3a and locked at a position where the frame 3a is in an open state when the lens is attached. In the case of detaching the lens 35, a lens lock releasing button 19 is depressed to turn the lens 35 counterclockwise, so that the extended part 15a of a mount spring 15A is displaced downward by its own spring, turns a locking lever 12 through an interlocking lever 16 and releases the locking of a set gear 11, whereby the curtain 1 travels by a coil spring 8 and shields the frame 3a. When the lens 35 is attached, a motor 25 is rotated counterclockwise, a rocking gear 28 is meshed with the gear 11 to wind up the curtain 1, whereby the frame 3a is opened. Then, the lever 12 locks the gear 11 and also instantaneously reversely rotates the motor 25, so that the meshing of the gear 28 with the gear 11 is released.
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