Self-processing film unit

A self-processing film unit having a mask sheet which is provided with an opening defining an image forming area, a cover sheet closing said image forming area, a supply of processing solution, a trapping member which is adapted to catch surplus processing solution, one end of said mask sheet being folded back in such a manner as to enclose said trapping member and being secured to said cover sheet, said cover sheet having a plurality of first portions and a plurality of second portions adjacent said trapping member, said first and second portions extending away from said opening toward said folded back end, said first and second portions being disposed in alternation to each other, the length of each of said first portions being greater than the length of each of said second portions, and a plurality of air venting passages bounded by each of said first portions of which a part is free from securement to adjacent parts of said mask sheet.

A self-processing film unit having a mask sheet which is provided with an opening defining an image forming area, a cover sheet closing said image forming area, a supply of processing solution, a trapping member which is adapted to catch surplus processing solution, one end of said mask sheet being folded back in such a manner as to enclose said trapping member and being secured to said cover sheet, said cover sheet having a plurality of first portions and a plurality of second portions adjacent said trapping member, said first and second portions extending away from said opening toward said folded back end, said first and second portions being disposed in alternation to each other, the length of each of said first portions being greater than the length of each of said second portions, and a plurality of tiny air holes in portions of said mask sheet contacting said trapping member above said first portions.

A self-processing film unit having a mask sheet which is provided with a framing opening defining an image forming area, a cover sheet closing said image forming area, a supply of processing solution, a trapping member which is adapted to catch surplus processing solution, one end of said mask sheet being folded back in such a manner as to enclose said trapping member and being secured to said cover sheet, a plurality of openings adapted to allow said surplus processing solution to pass therethrough, said openings being formed in said cover sheet adjacent said trapping member is located, at least one of said plurality of openings being narrower than others of said openings in a direction away from said framing opening and having its edge adjacent said framing opening disposed farther from said framing opening than are the edges of others of said openings, and an air venting passage formed by a part of said mask sheet located above said narrower opening which is free from securement to said cover sheet.