公开(公告)号：US5658716A

公开(公告)日：1997-08-19

申请号：US752142

申请日：1996-11-19

申请人： Katsumi Tashiro ,  Hitoshi Komiyama ,  Yoshio Hara

发明人： Katsumi Tashiro ,  Hitoshi Komiyama ,  Yoshio Hara

IPC分类号： G03B17/32 ,  G03C3/00 ,  C03D13/08 ,  C03D13/10 ,  C03D13/14

CPC分类号： G03C3/00 ,  G03B17/32

摘要： A sheet film package contains a sheet film unit in a light-shielding envelope with an open end through which the sheet film unit is movable into and out of the light-shielding envelope. The light-shielding envelope is formed by folding a sheet of light-tight material in half to provide a folded side, and securely sealing joints of the folded sheet along a side opposite side to the folded side as well as an end opposite to the open end, wherein a middle portion of the folded side has a larger folding angle compared with end portions thereof.