Patent ID: 7690010
Filing Date: 2010-03-30
Classification: G11B

Abstract:
1. A photosensitive recording medium cartridge comprising: a disc-shaped photosensitive recording medium; a cartridge body receiving the photosensitive recording medium therein so that the photosensitive recording medium can rotate, the cartridge body having a first opening for exposing a center and a recording surface of the photosensitive recording medium to the outside; a light-shield plate attached to the outside of the cartridge body and having a second opening which faces the first opening and which exposes the center and another recording surface of the photosensitive recording medium to the outside; and a shutter which is put between the cartridge body and the light-shield plate, which is disposed so as to be movable between a close position for closing the first opening and an opening position for unclosing the first opening and which has an external size larger than that of each of the first opening and the second opening, wherein the cartridge body is provided with recesses into which end edges of the outer perimeter of the light-shield plate are inserted, and wherein the cartridge body is formed so that an inner surface of the cartridge body to the photosensitive recording medium and an outer surface of the cartridge body to the shutter are matted or embossed with a surface roughness Ra of 5 to 20 μm.