To provide a light-shielding flange member featuring that when a thin light shielding flange member is manufactured by injection molding, a hollow cylindrical boss part of the light-shielding flange member is fixed to the inside of the hollow cylinder of a winding core without using an auxiliary member, that the inside of the hollow part of the cylindrical boss part of the flange member is fixed to the adaptor of a cartridge without loosening, and that the flange is easily attached and detached and is stably manufactured.
A pair of light-shielding flange members is produced, with each flange member having a hollow cylindrical boss part and a concentric flange integrated with the hollow cylindrical boss part. The boss part is to be fitted to the inside of the hollow part at either end of the winding core of a roll type photosensitive material which is prepared by winding a wide strip type photosensitive material on the hollow cylindrical winding core. The flange member is characterized in that the outer surface of the hollow cylindrical boss part is provided with a plurality of thinned ribs parallel to the axis of the hollow cylindrical boss part.
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NAGASAKI MITSURU
IKARIYA TOSHIYUKI
