Abstract A self-developing film unit including a photosensitive sheet and a transparent sheet bound at their margins in face-to-face relation and adapted to be processed to produce a visible image between the sheets by advancing the sheets between a pair of pressure-applying members to spread a processing liquid between the sheets from a container one end thereof toward the other end of the film unit. Trapping means are provided at the other end of the film unit for collecting and retaining excess processing liquid. The film unit is adapted to be retained intact following spreading of the processing liquid, and includes trapping means providing a trapping space bounded by the sheets at the other end of the film unit and means for securely laminating the sheets to one another intermediate the area of the film unit containing the image and the trapping space to prevent flowback and/or migration of excess processing liquid from the trapping space into the adjacent image-containing area.
A photographic film unit as defined in claim 1 wherein said processing composition includes water and said material includes a polymer at least swellable by water.
Claim 2
Dependent Claim
43 words
A photographic film unit as defined in claim 1 wherein said elongated means for causing said photosensitive and second sheets to be pressed together in said transverse region comprise a narrow, elongated element secured to one of said sheets in said transverse region.
Claim 3
Dependent Claim
15 words
A photographic film unit as defined in claim 3 wherein said element comprises a filament.
Claim 4
Dependent Claim
26 words
A photographic film unit as defined in claim 3 wherein said element is secured between said retaining sheet and said exterior surface of said photosensitive sheet.
Claim 5
Dependent Claim
57 words
A photographic film unit as defined in claim 1 wherein said elongated means for causing said sheets to be pressed together in said transverse region comprise a transverse section of one of said photosensitive and second sheets embossed toward the other of said photosensitive and second sheets to form a narrow rib extending toward said other sheet.
Claim 6
Dependent Claim
19 words
A photographic film unit as defined in claim 6 wherein said second sheet is embossed to form said rib.