| 摘要 |
PURPOSE:To prevent a shutter from getting over a recessed part of a cartridge case at the time of the return operation of the shutter, by adding a reinforcing member for controlling a fact that a first face plate part and second face plate part are opened each other, between both the face place parts for constituting the shutter. CONSTITUTION:At the time of the return operation of a shutter 3, it moves quickly in a recessed part 6 by a springy force of a helical spring 14, comes into collision with a rise edge 6a of the recessed part 6 and stops, therefore, its face plate parts 3a, 3b are apt to be deformed in the direction where they are opened each other, and sometimes a read end 3d of the shutter 3 runs on the rise edge 6a of the recessed part 6. Therefore, a reinforcing member 16 is provided on a position of a corner part 15 of a connecting plate part 3c for connecting the first face plate part 3a and the second face plate part 3b. In this way, a deformation in the direction where they become open is suppressed, and it does not occur that its end part 3d runs on the rise edge 6a of the recessed part.
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