Photosensitive recording medium cartridge

A photosensitive recording medium cartridge comprising a cartridge body, an opening, and a shutter, the cartridge body receiving a disc type photosensitive recording medium therein so that the photosensitive recording medium can rotate, the opening being provided in the cartridge body for exposing the photosensitive recording medium to an outside, the shutter being attached to the cartridge body so that the shutter can move between a close position for closing the opening and an open position for opening the opening, wherein:

• the shutter includes a bent portion which is formed in an outer circumferential end portion of the shutter so as to be bent toward the cartridge body side;
• the cartridge body includes a protrusion portion which is formed in a position corresponding to the outer circumferential end portion;
• the shutter includes a first light-shield plate portion slidably moving so as to open/close the opening, a second light-shield plate portion provided vertically at an end on a side of the first light-shield plate portion which can move in a direction of opening the shutter, and a third light-shield plate portion provided vertically with respect to the second light-shield plate portion in a direction of opening the shutter;
• and
• the cartridge body includes a protrusion portion upper surface formed so as to face the first light-shield plate portion when the shutter is in the close position, a protrusion portion side surface formed so as to face the second light-shield plate portion when the shutter is in the close position, and a shutter slide surface offset in the inside of the protrusion portion upper surface and formed so as to face the third light-shield plate portion when the shutter is in the close position.