Abstract: In a lens-fitted photographic film unit, a connection lever makes one reciprocating movement when struck by a shutter actuating lever. The reciprocating movement of the connection lever is transmitted to a crank lever to a pair of shutter blades to cause the shutter blades to open and then close a shutter aperture. The connection lever is coupled to the crank lever through a connection pin and a cam slot. The cam slot has an actuating portion and a keeping portion. While the connection pin moves along the actuating portion, the movement of the connection lever is transmitted to the shutter blades through the crank lever to open and close the shutter aperture. While the connection pin moves along the keeping portion, the movement of the connection lever is not transmitted to the shutter blades so that the shutter blades are kept in the opened position.

Abstract: In a lens-fitted photographic film unit, a connection lever makes one reciprocating movement when struck by a shutter actuating lever. The reciprocating movement of the connection lever is transmitted to a crank lever to a pair of shutter blades to cause the shutter blades to open and then close a shutter aperture. The connection lever is coupled to the crank lever through a connection pin and a cam slot. The cam slot has an actuating portion and a keeping portion. While the connection pin moves along the actuating portion, the movement of the connection lever is transmitted to the shutter blades through the crank lever to open and close the shutter aperture. While the connection pin moves along the keeping portion, the movement of the connection lever is not transmitted to the shutter blades so that the shutter blades are kept in the opened position.

Abstract: A telephotographic optical system is incorporated into a mechanism unit with an exposure mechanism, and the mechanism unit is removably attached to a main body having a cassette chamber and a film roll chamber as an integral body. The telephotographic optical system is constituted by a telephotographic taking lens, and a pair of mirrors attached to an exposure chamber so as to conduct light entering through the taking lens along a Z-shaped light path toward an exposure aperture. A lens aperture changing mechanism is also incorporated in the mechanism unit. A switching member of the lens aperture changing mechanism is disposed on an upper wall portion of the film unit. An aperture-stop member having at least a lens aperture is moved by the switching member so as to place the lens aperture in the exposure light path.