US3603230A - Photographic film unit - Google Patents

Photographic film unit Download PDF

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Publication number
US3603230A
US3603230A US840177A US3603230DA US3603230A US 3603230 A US3603230 A US 3603230A US 840177 A US840177 A US 840177A US 3603230D A US3603230D A US 3603230DA US 3603230 A US3603230 A US 3603230A
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US
United States
Prior art keywords
container
film unit
fluid
processing fluid
envelope
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US840177A
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English (en)
Inventor
Karl Wagner
Hans-Peter Huber
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Agfa Gevaert AG
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Agfa Gevaert AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
Application granted granted Critical
Publication of US3603230A publication Critical patent/US3603230A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/32—Development processes or agents therefor
    • G03C8/34—Containers for the agents

Definitions

  • the container is provided with a substantially centrally located gas-filled insert or with a substantially centrally located fluidfree portion which reduces the quantity of fluid in the corresponding part of the container to thus insure more satisfactory distribution of processing fluid upon rupture of the container when the film is caused to pass between two pressure-applying rolls.
  • the present invention relates to photographic film units for use in cameras for instant photography, i.e., in cameras which can immediately develop the film. More particularly, the invention relates to improvements in the construction of rupturable containers for processing fluid which are utilized in photographic film units to distribute processing fluid between an exposed photosensitive sheet and a print receiving sheet when the film unit is caused to pass through the nip between two rolls or analogous pressure-applying members.
  • a drawback-of such proposal is that the processing fluid leaves the ruptured container in the form of two separate streams and that. the area directly behind the nondestructible portion of the weakened edge is not covered with processing fluid -or receives such fluid for a shorter interval of time the the remaining areasThis causes undesirable differences in the development of prints and thus affects the quality of images.
  • film units embodying containers with weakened edges of nonuniform strength are normally longer than necessary so as to insure that the area not covered with processing fluid is not a part of the image. This, of course, brings about an increase in the overall size of the film unit and results in waste of valuable material.
  • An object of our invention is to provide a photographic filmunit which can be used in cameras for instant photography and which is simpler, less expensive and more reliable than presently known film units.
  • Another object of the invention is to provide the film unit with a novel and improved rupturable container for processing fluid.
  • a further object of the invention is to provide a rupturable container which insures uniform distribution of processing fluid between the photosensitive and print-receiving sheets of a film unit in such a way that the uniform distribution begins in the area which is immediately adjacent to the destructible portion of the container.
  • An additional object of the invention is to provide a container which is designed to insure immediate uniform spreading of processing fluid as soon as such fluid leaves the ruptured portion of the container.
  • An ancillary object of the invention is to provide the container with novel flow regulating means for the processing fluid.
  • sheets (one of which is photosensitive and the other of which i receives the'print) having adjacent front portions and arranged to overlap each other at least while their outer sides are subjected to pressure during travel of the film unit between a pair of pressure-applying members at a developing station, and a novel elongated rupturable container for a supply of processing fluid which is located between and extends transversely of the sheets in the region of their front portions.
  • the container comprises a longitudinally extending weakened portion which is remote from the front portions of the sheets, and substantially centrally located flow regulating means arranged to reduce the quantity'of processing fluid in the corresponding (central) part of the container.
  • the flow-regulating means may comprise a separately produced insert, e.g., a cushion of foamed plastic material or a gas-filled envelope which displaces processing fluid from the central part of the container, or an integral fluid-free portion of the containers envelope.
  • a separately produced insert e.g., a cushion of foamed plastic material or a gas-filled envelope which displaces processing fluid from the central part of the container, or an integral fluid-free portion of the containers envelope.
  • Such fluid-free portion may be of polygonal outline and is preferably positioned in sucha .way.
  • FIG. 1 is a fragmentary perspective view of a photographic film unit which embodies one form of the invention
  • FIG. 2 is an enlarged transverse sectional view as seen in the direction of arrows from the line II-II of FIG. 1;
  • FIG. 3 is a perspective view of a portion of a second photo- I graphic film unit.
  • FIG. 4 is an enlarged longitudinal sectional view as seen in the direction of arrows from the line IV-IV of FIG. 3.
  • FIG. I illustrates a photographic film unit comprising. a photosensitive sheet 1 whose photosensitive surface is turned toward the observer.
  • the front portion of the sheet 1 is connected to the front portion of a second or print receiving sheet 2.
  • the print receiving surface of the sheet 2 is adjacentto the ex osed photosensitive surface of the sheet 1 when the sheet 2 is folded over and overlies the sheet 1.
  • Such folding is brought about during passage of the film unit throughthe nip between two juxtaposed pressure-applying members (not shown) which are located in front of the film unit, i.e., to the left, as viewed in FIG. I.
  • the sheet 1 is provided with a suitably cohfigurated leader 3 which can be grasped by fingers to pull the.
  • the pressure-applying members in a manner are preferably rolls.
  • a positive image developes on the print receiving surface of the sheet 2 subsequent to passage of the film unit through the developer, I.E., between the aforementioned pressure-applying rolls.
  • the generation of image is due to the action of a processing fluid which is normally entrapped in; a rupturable container 6 mounted on the sheet I in the region of its front portion in such a way that it is located between the sheets 1, 2 during travel between the pressure-applying rolls.
  • the rupturable container 6 is secured to the sheet 1 by elastic strips 4,5 so that such strips define a pivot axis about which the container can turn at right angles to the longitudinaldirection of the sheet I.
  • the container 6 includes an envelope preferably consisting of a single sheet or foil of synthetic plastic material which is folded over itself along that edge which is adjacent to the strips 4, S and whose overlapping edge portions 6a, 6b, 6c
  • the shorter edge portions 6a, 6b are substantially stronger than the elongated rear edge portion 6c so that, when the container 6 is caused to pass between the pressure-applying rolls at the developing station, the container bursts or is ruptured along its weakened edge portion 60 and spills the processing fluid onto the adjoining surfaces of the sheets 1 and 2.
  • Such ready destructibility of the edge portion 6c can be achieved by welding or otherwise bonding the corresponding edges of the sheet to each other with a force which is much weaker than the bond along the shorter edge portion 6a or 6b.
  • the edge portion 6c can be said to constitute a weakened portion or seam of the rupturable container 6 and is remote from the front portions of the sheets 1, 2.
  • the container 6 accommodates a fluid flow regulating insert 7 which serves as a means for regulating the flow of processing fluid upon destruction of the weakened portion 60.
  • the insert 7 comprises a central portion 7A whose cross-sectional area corresponds substantially to that of the central part of the container 6. This central portion 7A occupies between one-fifth and one-eighth of the overall length of the container 6 and insures that the central part of the chamber defined by the envelope of the container contains little (if any) processing fluid.
  • the central portion 7A preferably consists of a metallic or plastic foil which is impermeable to the processing fluid and which serves as an envelope for a supply or bubble of gaseous fluid (e.g., nitrogen).
  • the internal surfaces of the envelope of the central portion 7A are grooved (as at 7B) in longitudinal direction of the film unit to insure that the entrapped gas can flow through the nip between the pressure-applying rolls when the front part of the central portion 7A is already located downstream but the rear part of the central portion 7A still remains upstream of the nip.
  • the grooves 78 permit substantial compression and deformation of the envelope of the portion 7A without the danger of rupture of the envelope. Such rupturing could affect the quality of images because the gas would be free to penetrate into the processing fluid and would prevent uniform distribution of such fluid along the sheets 1 and 2.
  • the central portion 7A of the insert 7 can be made of foamed synthetic plastic material with closed pores (at least along its external surface).
  • the central portion 7A is provided with two extensions or wings 7a, 7b which extend in the longitudinal direction of the container 6, i.e., toward the edge portions 611, 6b and serve as a means for preventing sidewise movements of the central portion 7A.
  • the thickness of the extensions 70, 7b equals or approximates the minimum thickness of the container 6 (i.e., the
  • the main advantage of the central portion 7A of the insert 7 is that it reduces the quantity of processing fluid in the central part of the container 6 but without necessitating the provision of a weakened portion 6c of nonuniform strength.
  • the front of the outflowing processing fluid is not a straight line immediately after the fluid is free to leave the container, i.e., the front has a depression in its central part; however, such front becomes straight shortly thereafter and remains substantially straight during further advance of the film unit between the pressure-applying rolls.
  • the distance required for'straightening of the front of the outflowing fluid is rathershort.
  • FIGS. 3 and 4 illustrate a portion of a second photographic film unit which comprises two sheets (only the sheet 101 shown) and a different rupturable container 106.
  • This container again comprises two relatively strong lateral edge portions 106a, l06b and a weakened portion or seam 1060 which is destroyed when the container is caused to pass between the pressure-applying rolls (not shown).
  • the envelope of the container 106 preferably consists of synthetic plastic material.
  • the insert 7 of FIGS. 1 and 2 is replaced with a modified flowregulating means, namely with a specially designed and produced integral fluid-free portion 106d of the envelope of the container 106.
  • the fluid-free portion 106d is of triangular shape and occupies the central part of the container.
  • the rear side 106D of the triangular. portion 106d is preferably spaced from and at least substantially parallel to the weakened portion 1066. This insures that a small amount of processing fluid can be stored in front of the central part of the portion 1060.
  • a triangular portion 106d has been found to be particularly advantageous because it occupies a relatively small part of the total volume of the container 106, l.E., the latter can store a substantial amount of processing fluid.
  • the flow-regulating effect of the triangular fluid-free portion 106d is the same as that of a rectangular portion having sides of the same length.
  • the amount of processing fluid which is stored between the side 106D and the adjoining part of the weakened portion 106s suffices to insure that the processing fluid spreads along the full width of the two sheets as soon as the portion 106c is destroyed. Fluid which flows inwardly from the marginal portions of the sheets compensates for lack of substantial amounts of fluid behind the side 1061').
  • the fluid spreads toward the rear edges of overlapping exposed and print-receiving sheets in the form ofa wide carpet which covers uniformly the adjoining internal surfaces of the sheets.
  • the fluid-free portion 106d can be obtained by welding together the panels of the containers envelope within the entire triangular area. However, it is normally sufficient to weld only the sides of the triangular area, preferably simultaneously with welding of the portions 106a, 1061; and 1060.
  • the fluid-free portion 106d may consist of several discrete fluid-free portions which together form a flow regulating means of preferably triangular outline.
  • a photographic film unit comprising a pair of sheets having adjacent front portions and arranged to overlap each other at least while the outer sides thereof are subjected to pressure during travel through a developing station;.and .an elongated rupturable container for'a supply ofprocessing-fluid located between and extending transversely of said sheets in the region 'ofsaid front poi'tions, said container. comprising a longitudinally extending weakened portion ;remote from said front portions and substantially centrally located flow regulating means including a deformable insert arranged to reduce the quantity of processingfluid in the corresponding part of the container.
  • a film unit as defined in claim 1, wherein said insert comprises a deformable central portion and a pair of extensions each extending from said central portion and lengthwise of said container.
  • a photographic film unit comprising a pair of sheets having adjacent front portions and arranged to overlap each other at least while the outer sides thereof are subjected to pressure during travel through a developing station; and an elongated rupturable container comprising a flexible envelope for a supply of processing fluid located between and extending transversely of said sheets in the region of said front portions, said container further comprising a longitudinally extending weakened portion remote from said front portions and substantially centrally located flow-regulating means arranged to reduce the quantity of processing fluid in the corresponding part of the container, said flow regulating means constituting an integral fluid-free portion of said envelope and said fluidfree portion having a substantially triangular outline.
  • a film unit as defined in claim 7, wherein said envelope comprises a pair of panels which are bonded to each other at least along the outline of said fluid-free portions.
  • a photographic film unit comprising a pair of sheets having adjacent front portions and arranged to overlap each other at least while the outer sides thereof are subjected to pressure during travel through a developing station; and an elongated rupturable container comprising a flexible envelope for a supply of processing fluid located between and extending transversely of said sheets in the region of said front portions, said container further comprising a longitudinally extending weakened portion remote from said front portions and sub stantially centrally located flow-regulating means arranged to reduce the quantity of processing fluid in the corresponding part of the container, said flow regulating means constituting an integral fluid-free portion of said envelope adjacent to but spaced from said weakened portion so that some processing fluid is stored therebetween.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Packages (AREA)
US840177A 1968-07-11 1969-07-09 Photographic film unit Expired - Lifetime US3603230A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1772844A DE1772844C3 (de) 1968-07-11 1968-07-11 Fotografischer Filmverband

Publications (1)

Publication Number Publication Date
US3603230A true US3603230A (en) 1971-09-07

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Application Number Title Priority Date Filing Date
US840177A Expired - Lifetime US3603230A (en) 1968-07-11 1969-07-09 Photographic film unit

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US (1) US3603230A (nl)
JP (1) JPS4918262B1 (nl)
BE (1) BE735895A (nl)
DE (1) DE1772844C3 (nl)
NL (1) NL165571C (nl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833382A (en) * 1972-12-29 1974-09-03 Polaroid Corp Photographic products including rupturable containers
EP0042081A1 (en) * 1980-06-16 1981-12-23 Polaroid Corporation Fluid Containers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833381A (en) * 1972-10-25 1974-09-03 Polaroid Corp Photographic products including rupturable containers

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750075A (en) * 1953-04-09 1956-06-12 Polaroid Corp Collapsible liquid-carrying container
US3342600A (en) * 1963-07-25 1967-09-19 Polaroid Corp Photographic film unit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221942A (en) * 1963-07-25 1965-12-07 Polaroid Corp Collapsible fluid container

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2750075A (en) * 1953-04-09 1956-06-12 Polaroid Corp Collapsible liquid-carrying container
US3342600A (en) * 1963-07-25 1967-09-19 Polaroid Corp Photographic film unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3833382A (en) * 1972-12-29 1974-09-03 Polaroid Corp Photographic products including rupturable containers
EP0042081A1 (en) * 1980-06-16 1981-12-23 Polaroid Corporation Fluid Containers

Also Published As

Publication number Publication date
DE1772844B2 (de) 1977-02-17
NL6910489A (nl) 1969-12-29
NL165571B (nl) 1980-11-17
BE735895A (nl) 1970-01-12
JPS4918262B1 (nl) 1974-05-09
DE1772844C3 (de) 1982-01-14
DE1772844A1 (de) 1971-06-09
NL165571C (nl) 1981-04-15

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