Patent ID: 6885521

Claim:
A metal shutter for use with a disc cartridge, comprising: larger and smaller rectangular screen portions which are connected through a thinner connecting portion thereby to have a generally U-shaped cross section, said smaller rectangular screen portion having an inside surface which faces an inside surface of said larger rectangular screen portion and an outside surface which faces outside; a first stamped rough outside surface part integral with said outside surface of said smaller rectangular screen portion; a non-rough outside surface part integral with said outside surface of said smaller rectangular screen portion, said non-rough outside surface being surrounded by said first stamped rough outside surface part thereby to constitute a given pattern which stands out against said stamped rough outside surface part; a first stamped rough inside surface part which is integral with said inside surface of said smaller rectangular screen portion at a position corresponding to said first stamped rough outside surface part; a second stamped rough outside surface part integral with said outside surface of said smaller rectangular screen portion at a position remote from said first stamped rough outside surface part, said second stamped rough outside surface part being configured to form a given pattern; and a second stamped rough inside surface part integral with said inside surface of said smaller rectangular screen portion at a position corresponding to said second stamped rough outside surface part.