A device connector has a housing to be mounted on a device. In the light-shielded photosensitive material roll, a spacer sheet, which has substantially a same thickness as a thickness of the light-shielding flanged cylinder, is bonded and fixed to an inner side wall surface of the winding core corresponding to a position at which a distal end portion of a cylindrical portion of the flanged cylinder is extended. The second body element may also have a characteristic that is changeable. The invention is characterised in that it consists in carrying out said synthesis in a single step by bringing together salt above, Karstedt in the presence of a solvent and a base at room temperature.