CARTRIDGE AND MANUFACTURING METHOD THEREOF

摘要

A cartridge accommodates a recording medium etc, and includes an opening and a shutter for opening and closing the opening. The shutter surface is formed with a hole with which an external drive member engages for driving the shutter. An inner side peripheral surface of the hole, upon which at least the drive member impinges when opening and closing the opening, is constructed of a bending portion continuous from the shutter surface. The bending portion can be worked as a continuous surface by punching out a prepared hole so as to leave a portion corresponding to the bending portion and thereafter bending it. A resinous protection layer having a thickness more than 12 mum is provided on the shutter surface upon which the drive member impinges when engaging with the hole.