Patent ID: 6533475
Filing Date: 2003-03-18
Classification: G03B,G03C

Abstract:
An instant photo film pack, loaded in a pack holder, containing plural instant photo film units in light-tight fashion, said instant photo film unit including a photosensitive sheet, an image receiving sheet and a withdrawing sheet, said image receiving sheet being overlapped onto said photosensitive sheet to transfer an exposed image on said photosensitive sheet to said image receiving sheet as a positive image, said instant photo film pack comprising:a box-shaped case body formed from plastic material, said case body having a top wall and main side walls, said top wall has an exposure opening for allowing exposure to said photosensitive sheet; a pressure plate formed from plastic material, said pressure plate being provided inside said case body between a plurality of stacked said photosensitive sheets and a plurality of stacked said image receiving sheets, said pressure plate pressing said photosensitive sheets toward said exposure opening; a bottom cover formed from plastic material, said bottom cover having a bottom plate for covering bottom side of said case body, bottom side walls stretched upward from said bottom plate, and engaging ridges integrated with said bottom side walls and projected toward inside of said bottom cover, bottom surfaces of said engaging ridges having inclined planes that increases the height of said engaging ridges gradually toward edges thereof; and a pair of ribs provided on the bottom of said main side walls, top surfaces of said ribs being inclined so as to fit said inclined planes, said ribs putting into engaging grooves formed in spaces surrounded by said bottom plate, said bottom side walls and said engaging ridges, so that said bottom cover being secured to said case body.