| 摘要 |
PROBLEM TO BE SOLVED: To make a shutter mechanism light in weight while keeping the strength of an arm, and to increase a shutter speed. SOLUTION: A shutter aperture 1a formed in a shutter substrate 1 is opened/ closed by several blades 2. The blades 2 are supported by arms 3 to 5, and the arms 3 to 5 are supported by shafts in a rocking state, and the blades 2 are driven in parallel by rocking the arms so as to be retreated beneath the shutter aperture 1a. Projections 5e and 5f are formed on the arm 5 so as to be positioned in an overlaid state with the other arms 3 and 4. The projections 5e and 5f are separately positioned between the arms 3 and 4 and a metallic partitioning plate not shown in Figure, then, the projections 5e and 5f are sandwiched between the arms 3 and 4 and the partitioning plate when the blades 2 are driven so as to open/close the shutter aperture 1a, so that the elastic deformation of the arm 5 is prevented, then, the arm 5 can be manufactured by using materials such as plastic which is inferior in terms of strength but light-weight.
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