Patent ID: 6186680
Filing Date: 2001-02-13
Classification: G03B

Abstract:
A self-developing photo film unit having a photosensitive sheet, a cover sheet, a mask sheet and a trap member, said photosensitive sheet being secured to said mask sheet to close an aperture in said mask sheet, said cover sheet being opposed to said photosensitive sheet, said mask sheet having first and second edge portions bent back to wrap edges of said photosensitive sheet and said mask sheet, and having edge lines secured to said cover sheet, said trap member being secured to said first edge portion, being positioned on said photosensitive sheet and/or said mask sheet, and trapping a surplus part of developing solution spread between said photosensitive sheet and said mask sheet, said self-developing photo film unit comprising:said trap member comprising a chip of non-woven fabric having a first and second surfaces, having porosity of 70% or more, and having acid polymer impregnated therein, said first surface having said acid polymer impregnated more than said second surface; andsaid first surface being positioned on said mask sheet, and having a region which is nearer to said edge line of said mask sheet and secured to said mask sheet.