Patent ID: 7108950
Filing Date: 2006-09-19
Classification: G03B,G03C,G03D

Abstract:
1. An instant film unit comprising: a mask sheet, having an exposure opening of rectangle shape which is constituted by a first side and a second side extending in a conveying direction and a third side and a forth side extending in a widthwise direction perpendicular to said conveying direction, said mask sheet including a first folded end portion and a second folded end portion disposed on both ends of said exposure opening in said conveying direction; a first sheet overlaid on said mask sheet to close said exposure opening; a second sheet, being transparent, having a predetermined space to said first sheet, and attached to said first folded end portion and said second folded end portion of said mask sheet; a developing solution pod, enclosed in said first folded end portion and extending in said widthwise direction, said developing solution pod for being torn open while passing through a spreading roller so that developing solution is pushed out of said developing solution pod to spread between said first sheet and said second sheet; a trapping member, enclosed in said second folded end portion, said trapping member for catching a surplus of said developing solution passing through the area on which said exposure opening is disposed; and corner mask portions, disposed on four corners of said exposure opening, wherein: said corner mask portions are formed by curving each corner of said exposure opening; and said curve has a radius of 1 to 4 mm.