| 摘要 |
PROBLEM TO BE SOLVED: To execute appropriate exposure adjustment by a simple structure and simple operation. SOLUTION: A cam hole 66 formed at a shutter driving lever 52 is engaged with a cam pin 51b formed at a turning lever 51. The cam hole 66 possesses a first driving cam face and a second driving cam face whose shapes are different. The displacement amount of the shutter driving lever 52 is decided by the driving cam face thereof. The shutter driving lever 52 is moved in a back- and-forth direction by a changeover lever 47, so that the engaging position of the driving cam face and the cam pin 51b is selectively switched. Thus, the displacement amount of the shutter driving lever 52 is changed, so that a diaphragm size and time (shutter speed) for which the diaphragm size is held are switched. When the turning lever 51 is kicked off by a kick-off lever 63, the shutter driving lever 52 is rocked along the shape of the driving cam face engaged with the cam pin 51b, so that shutter blades 53 and 54 are opened and closed.
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