EP0181699A1 - Cuves de développement photographique - Google Patents

Cuves de développement photographique Download PDF

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Publication number
EP0181699A1
EP0181699A1 EP85307215A EP85307215A EP0181699A1 EP 0181699 A1 EP0181699 A1 EP 0181699A1 EP 85307215 A EP85307215 A EP 85307215A EP 85307215 A EP85307215 A EP 85307215A EP 0181699 A1 EP0181699 A1 EP 0181699A1
Authority
EP
European Patent Office
Prior art keywords
film
rib
spiral
plate
axial direction
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.)
Granted
Application number
EP85307215A
Other languages
German (de)
English (en)
Other versions
EP0181699B1 (fr
Inventor
Richard Dunn
John Denton
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.)
PHOTAX (LONDON) PLC
Original Assignee
PHOTAX (LONDON) PLC
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 PHOTAX (LONDON) PLC filed Critical PHOTAX (LONDON) PLC
Publication of EP0181699A1 publication Critical patent/EP0181699A1/fr
Application granted granted Critical
Publication of EP0181699B1 publication Critical patent/EP0181699B1/fr
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00
    • G03D13/02—Containers; Holding-devices
    • G03D13/08—Devices for holding exposed material; Devices for supporting exposed material
    • G03D13/14—Devices for holding exposed material; Devices for supporting exposed material for holding films in spaced convolutions

Definitions

  • Photographic processing tanks for processing lengths of exposed photographic film are well known and they consist essentially of a light-tight tank in which the film, arranged in a spiral coil, is supported on a holder.
  • the film is loaded on to the holder under darkroom conditions, such as safelight illumination or in total darkness.
  • the holder is then placed in the tank and the tank is made light-tight. Thereafter, the processing can be accomplished with the tank in normal lighting conditions.
  • the processing solutions are introduced in turn into the tank.
  • the tanks function with the minimum of processing solutions (dictated by the exhaustion rate of the processing solutions) and yet not only allow for rapid filling and emptying of the liquids, but also ensure that the formation of air bells on the film surface is inhibited to a maximum extent.
  • the processing solutions must be able to move freely over the film surface so that solutions which have been exhausted in certain areas of the film euml si on may be moved to other areas of the film. Similarly, solutions which have not been involved in a great deal of activity, and are, therefore, not exhausted, must be moved to those areas of the film where interaction with the film emulsion is greater. This periodic movement of the processing solution is conveniently brought about by completely inverting the processing tank at regular intervals.
  • the film holder for use in such a tank comprises a central column and a pair of annular plates mounted in spaced apart relation on the column. Each plate has a number of radially extending ribs which carry a further rib arranged in a spiral.
  • the film is carried in the holder with the lateral edges of the film in the spaces between the turns of the respective spirally arranged further ribs.
  • the further rib on each annular plate has such a depth relative to the radial ribs thereon to provide extra strength thereby allowing the spacing between adjacent turns of the furthers rib to be increased.
  • the shaped further rib produces a "venturi effect" which assists in the flow of processing liquid. All these advantages are achieved without resorting to a tank of larger volume than that generally required for satisfactory processing of 35 mm and/or 120/220 roll film lengths and widths.
  • a holder for a film processing tank comprises a generally cylindrical hollow tube 1 having an enlarged foot 3.
  • a pair of annular plates 5, each with an integral stub-column 7, are mounted on the tube 1.
  • the two stub-columns are arranged in overlapping relation so that the annular plates are in spaced apart relation.
  • the amount of overlap of the stub-columns can be adjusted so as to vary the spacing between the plates 5 and thereby accommodate films of different widths.
  • Each annular plate has a plurality of radially extending ribs 9 and these ribs support a further rib 11 integral therewith which is arranged on the ribs 9 in the form of a spiral.
  • each radial rib 9 is of generally rectangular cross-section with one side providing a support surface for the film. One of the corners 13 of the support surface is chamfered.
  • Each turn of the further rib 11 has a first part 15 which projects beyond the support surface of the ribs 9 and a second part 17 which extends almost to the side of the rib which is opposite the support surface.
  • Adjacent sides of adjacent turns of the further rib diverge at the first part 15 and also diverge at the second part 17 so that the space 19 between adjacent turns,is in the form of a venturi.
  • the further rib is of more rigid construction than has been known heretofore and this permits the spacing between adjacent turns of the rib to be increased.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Photographic Developing Apparatuses (AREA)
EP19850307215 1984-10-09 1985-10-09 Cuves de développement photographique Expired EP0181699B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8425436 1984-10-09
GB848425436A GB8425436D0 (en) 1984-10-09 1984-10-09 Photographic processing tanks

Publications (2)

Publication Number Publication Date
EP0181699A1 true EP0181699A1 (fr) 1986-05-21
EP0181699B1 EP0181699B1 (fr) 1989-03-22

Family

ID=10567890

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850307215 Expired EP0181699B1 (fr) 1984-10-09 1985-10-09 Cuves de développement photographique

Country Status (3)

Country Link
EP (1) EP0181699B1 (fr)
DE (2) DE3569046D1 (fr)
GB (1) GB8425436D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2359379A (en) * 2000-02-04 2001-08-22 Harry Graham New Photographic print or film holder

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151907A (en) * 1938-01-20 1939-03-28 Fink Roselieve Co Inc Film processing device
US2835181A (en) * 1953-12-14 1958-05-20 Albert R Seeley Fluid circulating film handling reel and tank

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151907A (en) * 1938-01-20 1939-03-28 Fink Roselieve Co Inc Film processing device
US2835181A (en) * 1953-12-14 1958-05-20 Albert R Seeley Fluid circulating film handling reel and tank

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2359379A (en) * 2000-02-04 2001-08-22 Harry Graham New Photographic print or film holder

Also Published As

Publication number Publication date
GB8425436D0 (en) 1984-11-14
EP0181699B1 (fr) 1989-03-22
DE181699T1 (de) 1987-02-05
DE3569046D1 (en) 1989-04-27

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