EP0272218A2 - Verfahren zur Herstellung eines Hologramms - Google Patents

Verfahren zur Herstellung eines Hologramms Download PDF

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Publication number
EP0272218A2
EP0272218A2 EP87810745A EP87810745A EP0272218A2 EP 0272218 A2 EP0272218 A2 EP 0272218A2 EP 87810745 A EP87810745 A EP 87810745A EP 87810745 A EP87810745 A EP 87810745A EP 0272218 A2 EP0272218 A2 EP 0272218A2
Authority
EP
European Patent Office
Prior art keywords
ferric
ferric salt
bleach bath
litre
acid
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.)
Withdrawn
Application number
EP87810745A
Other languages
English (en)
French (fr)
Other versions
EP0272218A3 (de
Inventor
Trevor Groves
Antony Ian Hopwood
John Andrew Clark
Timothy Nigel Briggs
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.)
Ilford Imaging UK Ltd
Original Assignee
Ciba Geigy AG
Ilford Ltd
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 Ciba Geigy AG, Ilford Ltd filed Critical Ciba Geigy AG
Publication of EP0272218A2 publication Critical patent/EP0272218A2/de
Publication of EP0272218A3 publication Critical patent/EP0272218A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/40—Chemically transforming developed images
    • G03C5/44—Bleaching; Bleach-fixing

Definitions

  • This invention relates to a method of preparing a hologram.
  • the material is holographically exposed and is then developed in a silver halide development agent.
  • the developed silver is then removed using either a solvent bleach bath or a rehalogenating bleach bath.
  • a solvent bleach bath When a solvent bleach bath is used the developed silver is converted to a soluble silver salt which is washed out of the material in a final washing.
  • a rehalogenating bleach bath When a rehalogenating bleach bath is used the developed silver is converted to a silver halide. This silver halide is redistributed within the gelatin layer and it helps to reinforce the holographic image and to increase its diffraction efficiency.
  • the most commonly used silver bleaching agents to use in a rehalogenating bleach bath is a ferric complex of ethylene diaminetetraacetic acid (E.D.T.A) such as ferric ammonium E.D.T.A or ferric sodium E.D.T.A.
  • E.D.T.A ethylene diaminetetraacetic acid
  • ferric ammonium E.D.T.A or ferric sodium E.D.T.A ferric ammonium
  • ferric sodium E.D.T.A ferric sodium
  • a method of preparing a hologram which is of the silver halide in gelatin binder type comprises holographically exposing holographic material by use of a coherent light, developing the holographic image by use of a silver halide developing solution and then bleaching the developed silver by use of a rehalogenating bleach bath which comprises a water soluble halide and the ferric salt of diethylenetriamine pentaacetic acid, the ferric salt of nitrilotriacetic acid, the ferric salt of ethyleneglycol tetraacetic acid or the ferric salt of 1,3-propylene diamine tetraacetic acid or a mixture of said ferric salts.
  • ferric DTPA The ferric salt of diethylenetriamine pentaacetic acid is hereinafter referred to as ferric DTPA.
  • ferric NTA The ferric salt of nitrilotriaacetic acid is hereinafter referred to as ferric NTA.
  • ferric EGTA The ferric salt of ethyleneglycol tetraacetic acid is hereinafter referred to as ferric EGTA.
  • ferric PDTA The ferric salt of 1,3-propylenediamine tetraacetic acid is hereinafter referred to as ferric PDTA.
  • ferric salts can be used either individually or in a mixture of these salts.
  • Another object of the present invention is a rehalogenating bleach bath which comprises a water-soluble halide and said ferric salt or a mixture of said ferric salts.
  • the preferred water soluble halide to use in the bleach bath is a bromide such as potassium and sodium bromide, where potassium bromide is preferred.
  • the preferred concentration of bromide is from 1.0 to 40.0 g/litre. Most preferably about 10 g/litre is used.
  • a useful concentration of the ferric compound to use in the bleach bath is from 10 g/litre to 90 g/litre.
  • the preferred concentration is about 20 g/litre.
  • the preferred pH range is from 1.0 to 4.0 and most preferably is about 2.0.
  • Samples of holographic material were prepared by coating onto a transparent photographic film base a gelatino silver halide emulsion which was substantially pure silver bromide having a mean crystal size of 0.03 microns at a silver coating weight of 30 mg/dm2.
  • the emulsion was optically sensitised with a red sensitising dye so that it was optimally sensitive to 633 nm. to colour of a He:Ne laser.
  • the material was holographically exposed using a He:Ne laser by a Denisyuk exposure method using a brushed aluminium plate as an object to yield (after processing) a reflective hologram.
  • the beam power of the laser was 400 ⁇ W/cm2.
  • Figure 1 shows that the percentage haze present in the samples processed in Bath 2 is significantly less than those processed in Bath 1.
  • Example I Further samples of holographic material were prepared as in Example I. The samples were holographically exposed as in Example I except that the beam power of the laser used was 200 ⁇ W/cm2.
  • the samples were then water washed for 30 seconds and then transferred to one of the following rehalogenating bleach baths.
  • All these baths contained 0.1 M ferric nitrate (9 H2O) 0.1 M sequestering agent 10 g/litre potassium bromide water 1 litre
  • the sequestering agent and the pH of the baths were as follows:
  • Example II Haze measurements were made as in Example I on each sample. Thus the exposure was 1/2 second. The percentage haze was measured at 580 nm the peak absorption of the hologram.
  • rehalogenating bleach baths of the present invention when used to process holographic material yield considerably less haze in the processed hologram.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
EP87810745A 1986-12-17 1987-12-11 Verfahren zur Herstellung eines Hologramms Withdrawn EP0272218A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8630187 1986-12-17
GB868630187A GB8630187D0 (en) 1986-12-17 1986-12-17 Processing holograms

Publications (2)

Publication Number Publication Date
EP0272218A2 true EP0272218A2 (de) 1988-06-22
EP0272218A3 EP0272218A3 (de) 1989-08-02

Family

ID=10609178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87810745A Withdrawn EP0272218A3 (de) 1986-12-17 1987-12-11 Verfahren zur Herstellung eines Hologramms

Country Status (3)

Country Link
EP (1) EP0272218A3 (de)
JP (1) JPS63163344A (de)
GB (1) GB8630187D0 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518680A (en) * 1983-02-17 1985-05-21 Konishiroku Photo Industry Co., Ltd. Bleach-fixing solution and processing of light-sensitive color photographic material by use thereof
GB8415247D0 (en) * 1984-06-14 1984-07-18 Blyth Holographics Ltd Colour control in holograms

Also Published As

Publication number Publication date
EP0272218A3 (de) 1989-08-02
GB8630187D0 (en) 1987-01-28
JPS63163344A (ja) 1988-07-06

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Inventor name: BRIGGS, TIMOTHY NIGEL