Shutter device

A shutter device used in a camera having two image-capturing optical systems, the device comprising:

• a shutter base having formed therein two shutter openings corresponding to the two image-capturing optical systems;
• a shutter member capable of simultaneously opening and closing the two shutter openings;
• a diaphragm plate having two open diaphragm openings and two small diaphragm openings formed therein;
• and
• a cam pin which can reciprocally travel, upon receipt of driving force from a single motor, along a travel path extending from the position of a start point to the position of an end point via an intermediate position, wherein
• a shutter cam hole into which the cam pin is to be inserted is formed in the shutter member, and the shutter cam hole defines actuation of the shutter member so as to perform each of opening and closing actions one or more times when the cam pin is reciprocally moved from the start position to the intermediate position and from the intermediate position to the end position;
• and
• a diaphragm cam hole into which the cam pin is to be inserted is formed in the diaphragm plate, and the diaphragm cam hole defines actuation of the diaphragm plate such that the two open diaphragm openings are located in front of corresponding shutter openings when the cam pin is located at any location from the start position to the intermediate position, and such that the two small diaphragm openings are located in front of corresponding shutter openings when the cam pin is located at any position from the intermediate position to the end position.