Patent ID: 7681212

Claim:
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 bent portion is formed in an end portion on a side of the outer circumferential end portion which can move in a direction of opening the shutter; 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 in a direction of closing the shutter with respect to the second light-shield plate portion; and the cartridge body includes a protrusive line which is inserted between the first light-shield plate portion and the third light-shield plate portion when the shutter is in the close position.