US3751256A - Fluid receiving means - Google Patents

Fluid receiving means Download PDF

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Publication number
US3751256A
US3751256A US00178046A US3751256DA US3751256A US 3751256 A US3751256 A US 3751256A US 00178046 A US00178046 A US 00178046A US 3751256D A US3751256D A US 3751256DA US 3751256 A US3751256 A US 3751256A
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US
United States
Prior art keywords
film unit
bladder
self
processing
photographic film
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
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US00178046A
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English (en)
Inventor
D Harvey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
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Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of US3751256A publication Critical patent/US3751256A/en
Anticipated expiration legal-status Critical
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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
    • G03C8/42—Structural details

Definitions

  • ABSTRACT An improved fluid receiving structure or trap for use with a self-processing photographic film unit or the like.
  • the trap is best adapted for use in composite or integral film units in which it is permanently locatable entirely within the borders of the unit, making unnecessary its separation from the unit after processing.
  • the trap comprises an inflatable bladder constrained by a substantially non-crushable framing structure.
  • Description of the :Prior Art 1 it is well known in the photographic arts to provide film units and photographic assemblages incorporating the necessary materials for processingjthe units immediately after their exposure to produce positive photographic prints.
  • film units comprise a v photosensitive element having a support layer for supcollecting and retaining the excess fluid at the end of the film unit opposite the pod end.
  • fluid'traps Previous collectors for excess processing fluid, generally referredjto as fluid'traps" and disclosed, for example, in U.S. PatsNos. 2,644,755 and 2,686,717, have been provided on extended or end portions of thefllm units as illustrated injUJS. Pat. No. 3,080,805.
  • Continu- -ous emphasis has been placed on reducing the size of the film units to permit their use in more compact cameras, and on eliminating most, stripping operations and "waste materials remaining after processing.
  • a viscous processing composi-- caustic, and hence must be completely enclosed to prevent damage to the apparatus and injury to its user, and (2) a significant amount of excess fluid has to be used to assure complete processing.
  • reage-receiving layer may be located either on the process sheet on the side closest to the photosensitive sheet, or preferably on the bottom side of the photosensitive sheet between an opaque layer and a transparent support.
  • No. 3,294,538 suggests forming a positive .trap by folding the end of the receiver sheet upon'its'elf and inter-- posing a spring member between the folded-over end of the sheet element and the photosensitive element to maintain the two separated so thatthe excess fluidcan readily enter the trap.
  • the heretofore. proposed excess trapping means have required the attachment of lifters and/orsprings to the unit.
  • This invention includes within its scope an improved fluid receiving structure or trap preferably for use in a film unit for collecting any excess processing composition or fluid that is spread between andacross superposed photosensitive and process sheets.
  • an integral film unit comprising a photosensitive sheet, a rupturable container or pod, and a process sheet in superposed face-to-face relation with the photosensitive sheet is provided with an excess fluid trap that may be concealed within the borders of the unit.
  • the trap comprises an inflatable bladder constrained by a substantially non-crushable framing or exoskeletal structure.
  • the bladder end of the film unit can be enclosed within a somewhat stiff, crush resistant, elongated shell or exoskeletal structure of U-shaped cross section.
  • the bladder and shell can be provided with suitable air vents, preferably out of alignment for permitting the escape of air from the bladder and shell as the processing fluid is forced therein.
  • the vent openings are of a size sufficient to permit the flow of air, but insufficient to permit the flow of viscous processing fluid.
  • Another object of the invention is to provide an improved fluid trap meansfor a film unit that is of a smaller size than prior known trap means, thereby reducing the overall size of film units whichin turn facili tates the constructionof more compact camera apparatus for using the filmiunits.
  • FIG. 1 is a perspective view of a photographic film unit in which a fluid trap constructed in accordance with a preferred embodiment of the present invention is embodied;
  • FIG. 4 is a segmental enlarged view in section similar to FIG. 3 showing the film unit passing between pressure-applying rollers of a camera for spreading the processing fluid and forcing excess fluid into the inflatable bladder of the fluid trap;
  • FIG. 5 is a segmental enlarged section view similar to FIG. 4 showing the film unit after the processing operation has been completed in which all of the excess processing fluid has been forced into the expandable bladder by the pressure-applying rollers, and the rollers are about to be separated by the shell-like enclosure to prevent them from pressing upon the bladder and causing a backflow of the fluid therein;
  • FIG. 6 is a perspective view of a modified form of spacer element.
  • film unit 8 is of the preferred composite or integral type and includes a photosensitive sheet 12 having an image recording section and a process sheet 14 to facilitate applying fluid to the image recording section.
  • the sheets l2, 14 are supplied before exposure and remain after processing as aprecut and laminated sandwich substantially in the form illustrated.
  • the photosensitive sheet 12 comprises a transparent support having thereon the following layers in sequence: an image-receiving or recording layer, an opaque reflecting layer, and at least one, and preferably three, silver halide emulsion layers having associated therewith a dye image-producing material.
  • the process sheet 14 is formed of a transparent material, e.g., cellulose triacetate film base, and permits exposure of the photosensitive sheet from the top side of the unit (the side illustrated in FIG. 1).
  • the rupturable pod used in the film unit may be selected from any of severaltypes and generally comprises a rectangular blank 16 .of a vapor-impervious material that is folded along a medial line 18 and is securely sealed or closed along its sides 20.
  • the free ends of blank 16 opposite the medial fold 18 are in register and provided along substantially their entire length with a rupturable seal 22 adapted to release processing fluid 11 supplied in pod l0upon the application of compressive pressure generated by passing the pod betweeen a pair of juxtaposed pressure-applying members such as rollers 24 (FIGS. 4 and 5) as might be found in a camera.
  • the pod 1 0 is attached to or cooperates with a leading end of film unit 8 in any suitable manner for discharging its fluid contents 11 between the photosensitive and process sheets l2, 14 respectively, and for this purpose may be provided with a flattened discharge mouth inserted into a space or slot provided between the photosensitive and process sheets at the leading end of the unit.
  • the processing fluid 11 containing an opacifler is released from pod l0 and spread in a layer over at least a predetermined exposure frame of photosensitive sheet 12 by passing the entire unit between the pressure-applying rollers 24.
  • the thickness of the fluid layer is precisely controlled by engageable end rims 25 on rollers 24 which hold the rollers apart the required distance.
  • the unit can be removed from the camera during development.
  • the processing fluid 11 then diffuses into photosensitive sheet 12 to either effect or initiate imagewise development of the silver halide emulsion layers.
  • imagewise distributions of diffusible dye image-providing material which is contained in each silver halide emulsion layer or in a layer contiguous thereto, are formed as a function of the-imagewise exposure of each silver halide emulsion layer. At least a portion of the imagewise distribution of diffusible dye image-providing material is diffused to the imagereceiving layer to provide a positive dye image.
  • the processing fluid trap or fluid receiving structure 6 of this invention is provided at thetrailing end of film unit 8 for collecting and confining any excess processing fluid 11 (FIGS. 4-15) and hence preventing the fluid from contaminating the camera apparatus or the user.
  • the trailing ends of the photosensitive and process sheets 12, 14 respectively are provided with one or more openings 26, 28 respectively extending therethrough, and an inflatable bladder 30 is sandwiched or interposed between the sheet ends in register with openings 26, 28 therein.
  • the bladder 30 comprises a rectangular blank of any suitable strong, pliable material such as polyethylene or the like that is inert to processing fluid.
  • the free ends 32 of the blank are positioned in register and are secured by any suitable adhesive to the photosensitive and process sheetsl2, 14 respectively.
  • a pocket is formed for receiving excess processing fluid 11 fed therein through an open mouth 36 formed between the free ends of the bladder.
  • the openings 26, 28 permit room'for bladder 30 to expand forming an increased internal void for processing fluid forced therein.
  • fluid back pressure is reduced by providing vent holes or slots 37 through which air can pass but fluid cannot. Normally, fluid back pressure should not be present in bladder 30 since the bladder in its normal flattened condition as seen in FIG. 3 is free of air. However, it is possible that air may be introduced into the bladder along with fluid 11.
  • a spacer element 38 of any suitable material such as plastic or cardboard having one or more notches or openings 40 is secured by any suitable adhesive or the like to one or both of the outer surfaces of photosensitive and process sheets l2, 14 respectively in register with bladder 30 and openings 26, 28.
  • one of the sheets l2, 14 has a plurality of openings 26 forming strengthening ribs 42 therebetween, a single unitary opening may be preferable since it would provide greater room for bladder expansion.
  • the openings 26 are generally of a rectangular configuration, they may be of any other suitable shape.
  • the spacer 38 may also be provided with ribs 44 preferably spaced out of alignment with ribs 42 in photosensitive sheet 12 to facilitate lateral spreading of the fluid within the bladder.
  • spacer 38 is shown as a rectangular member having openings 40 therein, one of the walls 46 of spacer-38 may be omitted to form a comb-shaped spacer 47 having a plurality of fingers 49 provided with beveled ends (FIG. 6).
  • a stiff elongated shell-like cover 48 of substantially U-shaped corss section is provided externally of the bladder and which may be slipped over the ends of the sheets l2, l4 and spacer 38.
  • the cover 48 is made of any suitable substantially stiff material such as plastic and is preferably held in place by ultrasonically sealing the sides 50'of cover 48 to the photosensitive and process sheets l2, l4 and spacer 38, or by any other suitable securing means. Since cover 48 has a thickness that is greater than the thickness of the laminated sheets l2, 14, at least one of the top or bottom sides 50 of the cover is provided with an inclined ramp 52 for spreading rollers 24 and facilitating movement of the cover through the rollers. The cover is further provided with air vents 51 through which air from bladder 30 may escape.
  • the sides 50 of cover 48 not only provide a rigid, preferably lined surface onto which data may be recorded, but in addition prevent rollers 24 from pressing on the filled bladder 30 causing fluid 11 in the trap to flow back between the photosensitive and process sheets l2, 14 respectively and deleteriously affect the processing action.
  • a self-processing photographic film unit including an image-recording portion, means for applying a fluent processing composition to the image-recording portion, and means for receiving excess processing composition including a bladder, and means outside the bladder for protecting the bladder against externally applied compressive forces.
  • a self-processing photographic film unit according to claim 2 wherein the skeletal structure is formed in part by an end portion of the image-recording portion which extends into the receiving means, said end portion having at least one aperture therein.
  • a self-processing photographic film unit according to claim 3 wherein a frame-like element is provided at the side of said end-portion remote from the bladder.
  • a self-processing photographic film unit wherein the frame-like element is of comb form and that the spine of the comb-form element is at the trailing end of the unit and the teeth members of the comb-form element are directed towards the image-recording regions, and wherein the free ends of the teeth members have inclined surfaces to assist in parting pressure-applying member used in the initiation of processing.
  • a self-processing photographic film unit according to claim 1 wherein a cover is provided over the exterior of the means outside the bladder for protecting the bladder.
  • a self-processing photographic film unit wherein the image-recording portion includes a photosensitive element and a process sheet, and the bladder is formed of a generally rectangular sheet of pliable material folded about its middle and with the sides contiguous with the fold being sealed and one of the free edges of the sheet being secured to the process sheet of the image-recording portion and the other of the free edges being secured to the photosensitive element of the image-recording element.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Cameras Adapted For Combination With Other Photographic Or Optical Apparatuses (AREA)
  • Sheet Holders (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US00178046A 1971-09-07 1971-09-07 Fluid receiving means Expired - Lifetime US3751256A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17804671A 1971-09-07 1971-09-07

Publications (1)

Publication Number Publication Date
US3751256A true US3751256A (en) 1973-08-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00178046A Expired - Lifetime US3751256A (en) 1971-09-07 1971-09-07 Fluid receiving means

Country Status (6)

Country Link
US (1) US3751256A (fr)
JP (1) JPS4837130A (fr)
CA (1) CA978789A (fr)
DE (1) DE2243753A1 (fr)
FR (1) FR2152661B1 (fr)
GB (1) GB1400196A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352879A (en) * 1979-11-29 1982-10-05 Fuji Photo Film Co., Ltd. Self-processing type photographic film unit with a trap member having gas discharging means
US4356248A (en) * 1981-05-26 1982-10-26 Polaroid Corporation Photographic product
US4545663A (en) * 1982-12-27 1985-10-08 Polaroid Corporation Integral self-developing film unit and system for use thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51134732A (en) * 1975-05-19 1976-11-22 Du Pont Mitsui Polychem Co Ltd Adhesive composition
JPS6242841A (ja) * 1986-07-26 1987-02-24 三井化学株式会社 積層物

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607285A (en) * 1968-04-15 1971-09-21 Polaroid Corp Photographic film unit
US3619193A (en) * 1968-12-30 1971-11-09 Polaroid Corp Photographic film unit
US3621768A (en) * 1969-08-19 1971-11-23 Polaroid Corp Photographic film unit having expandable high volume trap
US3652281A (en) * 1968-07-15 1972-03-28 Polaroid Corp Photographic film unit
US3652282A (en) * 1969-03-06 1972-03-28 Polaroid Corp Photographic film unit and method of manufacture
US3672272A (en) * 1970-06-04 1972-06-27 Eastman Kodak Co Photographic film unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3607285A (en) * 1968-04-15 1971-09-21 Polaroid Corp Photographic film unit
US3652281A (en) * 1968-07-15 1972-03-28 Polaroid Corp Photographic film unit
US3619193A (en) * 1968-12-30 1971-11-09 Polaroid Corp Photographic film unit
US3652282A (en) * 1969-03-06 1972-03-28 Polaroid Corp Photographic film unit and method of manufacture
US3621768A (en) * 1969-08-19 1971-11-23 Polaroid Corp Photographic film unit having expandable high volume trap
US3672272A (en) * 1970-06-04 1972-06-27 Eastman Kodak Co Photographic film unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352879A (en) * 1979-11-29 1982-10-05 Fuji Photo Film Co., Ltd. Self-processing type photographic film unit with a trap member having gas discharging means
US4356248A (en) * 1981-05-26 1982-10-26 Polaroid Corporation Photographic product
US4545663A (en) * 1982-12-27 1985-10-08 Polaroid Corporation Integral self-developing film unit and system for use thereof

Also Published As

Publication number Publication date
DE2243753A1 (de) 1973-03-15
FR2152661B1 (fr) 1976-01-23
FR2152661A1 (fr) 1973-04-27
CA978789A (en) 1975-12-02
JPS4837130A (fr) 1973-06-01
GB1400196A (en) 1975-07-16

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