WO1993010978A1 - Procede de fabrication d'une image coloree monochrome, teintee thermiquement - Google Patents

Procede de fabrication d'une image coloree monochrome, teintee thermiquement Download PDF

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Publication number
WO1993010978A1
WO1993010978A1 PCT/EP1992/002637 EP9202637W WO9310978A1 WO 1993010978 A1 WO1993010978 A1 WO 1993010978A1 EP 9202637 W EP9202637 W EP 9202637W WO 9310978 A1 WO9310978 A1 WO 9310978A1
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WO
WIPO (PCT)
Prior art keywords
dye
image
thermal
layer
donor element
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Application number
PCT/EP1992/002637
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English (en)
Inventor
Luc De Brabandere
Emiel Verdonck
Romain Bollen
Original Assignee
Agfa-Gevaert Naamloze Vennootschap
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Application filed by Agfa-Gevaert Naamloze Vennootschap filed Critical Agfa-Gevaert Naamloze Vennootschap
Publication of WO1993010978A1 publication Critical patent/WO1993010978A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/38264—Overprinting of thermal transfer images
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
    • B41M5/52—Macromolecular coatings
    • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers

Definitions

  • the present invention relates to a method of making a monochromic coloured thermal dye image for medical diagnostics or medical archiving in a dry and economic way, said monochromic coloured thermal dye image offering an enhanced information content.
  • the most important advantage of a colour photographic material resides in its capacity to offer more information in the lower density portions of the colour image when inspecting it with coloured light, the spectral composition of which is such that it is modulated by the dye image, than when inspecting it with white light. For instance, when a blue image has been produced more information can be retrieved by inspecting it with red or green light. Indeed, by the inspection with red or green light a higher image contrast is obtained especially in the lower density portions (shadow parts of a negative and highlights of a positive) . This is particularly useful in medical X-ray since in this way more information can be obtained from the highly radiation-absorbing parts of the body e.g. the bones.
  • a thermal dye sublimation transfer method for making a monochromic coloured thermal dye image for medical diagnostics or medical archiving comprising feeding an electric representation of a medical image obtained from any diagnostic source to a thermal imaging source, e.g.
  • a thermal printing head to selectively heat in accordance with said electric representation a dye-donor element comprising a support having thereon a dye layer containing a dye or a mixture of dyes having heat trans erability and thereby to information-wise transfer dye or a mixture of dyes from said dye-donor element to a dye-receiving element brought in face-to- face contact with said dye-donor element and comprising a support having thereon a dye image-receiving layer, wherein said information-wise transferred dye or mixture of dyes forms in said dye image-receiving layer a monochromic coloured dye image mainly absorbing in two primary colour spectral regions, preferably mainly absorbing in the red region of the visible spectrum and absorbing in the green region for at least 30% of the absorption in the red region.
  • electric representation as used herein electric signals are meant, which can be obtained from a detecting device capturing information-wise modulated ionizing radiation or otherwise obtained information-wise signals, which can be obtained from the reading out of analog or digital information stored in a memory.
  • a monochromic coloured dye image is meant that is not black.
  • ionizing radiation includes X- rays, ⁇ -parti ⁇ les, ⁇ -particles, ⁇ -rays and neutron radiation.
  • the monochromic coloured thermal dye image thus obtained can be inspected with white light or it can be inspected with coloured light, the spectral composition of which is such that it is modulated by the monochromic dye image e.g. inspection with green or red light in case the dye image absorbs or modulates green and red light.
  • the dye image obtained according to the present invention has a higher information content than that obtained from a corresponding black image and has a variable contrast in that the contrast can be freely modified with changes of the light spectrum of the viewing illuminator or by using coloured filters.
  • the improved visual retrieval, for medical diagnostics or medical archiving, of information from a monochromic coloured thermal dye image made according to the present invention is also based on the fact that the dye image still contains density differences (brightness differences) that are discernible with white light in the high density portions of the image, whereas in a corresponding black-and-white image such differences can no longer be observed.
  • a density of 2 in black-and- white transparencies means that only 1/100th part of the total amount of light projected onto said image is transmitted. In other words 99% of the incident light is absorbed.
  • a spectral density of 2 means that 99% of the light having a colour complementary to the colour of the light transmitted by the monochromic dye image is absorbed, but also that the said light of complementary colour still constitutes an amount of light (luminance) transmitted by the dye image.
  • a spectral density of e.g. 2 means that 99% of green and red light are absorbed, but that blue light is transmitted without substantial loss of intensity.
  • the human eye is particularly sensitive to perception of brightness differences in the higher density values of a blue dye image.
  • the present invention does not exclude the use of other "two third spectrum colours" for the dye image i.e. colours corresponding with a main absorption in at least two primary colour regions of the visible spectrum e.g. absorption of blue and red light. It is possible according to the present invention to use thermal dye sublimation materials capable of producing such two third spectrum colour images for making among other imaging techniques an X-ray record of objects having a certain thickness and complexity e.g.
  • the retrieved information content by white light inspection of said colour images is higher than in the case of black-and-white images.
  • more brightness differences can be visually retrieved with white light.
  • more information can be obtained from the lower density portions of the dye image by inspecting it with light, the spectral composition, of which is such that is modulated by the dye image, than by inspecting it with white light. For instance, when a blue dye image has been produced, more information can be retrieved with red or green light.
  • the inspection with coloured light can be carried out by using a coloured filter on the viewing light-box that contains a light source emitting visible light.
  • a coloured support or a support carrying a coloured subbing layer for carrying the image layer so that a filter on the viewing box may be omitted.
  • ⁇ Dmin represents the amount or number ( __ N) of just discernible density differences in a density interval _O, DIS can also be defined as follows :
  • the amount or number of discernible density differences and their distribution along the log E.t-axis is represented by the discernibility curve.
  • the area comprised between the discernibility curve and the log E.t-axis is a measure for the discernibility content (N) since :
  • the number "n" of the above-mentioned time intervals is sufficiently high to cover the whole sensitometric curve.
  • the energy values E.t ⁇ and E.t n represent the initial and terminal energy values respectively.
  • the thermal imaging source a number of energy values are set such that at different areas of the printed image different energy values are used, all of which differ from one another by one single energy unit or energy packet.
  • This energy unit is defined by the pulse time, the voltage over the resistor component, and the resistance values of the resistor component of the thermal imaging source.
  • the psychometrical method offers the possibility to determine in a fairly accurate way the visual retrieval of information content in different colour and black-and-white images and to compare them under that aspect.
  • the dye-donor element usually comprises a very thin support e.g. a polyester support, one side of which is covered with the dye layer, which contains the dye or mixture of dyes.
  • an adhesive or subbing layer is provided between the support and the dye layer.
  • a slipping layer that provides a lubricated surface against which the thermal imaging source e.g. the thermal printing head can pass without suffering abrasion.
  • An adhesive layer may be provided between the support and the slipping layer.
  • the dye layer can be a monochromic dye layer, which by transfer forms a monochromic coloured dye image in a single pass or in several passes or the dye layer comprises two or more differently coloured dye areas, which by sequentially performing the dye transfer process steps for the different dye areas form in register a monochromic coloured dye image in a single pass or in several passes.
  • the monochromic coloured dye image obtained should preferably have a high density. It is possible to enhance the density according to a process described in US-A 4,833,124 by repeating said selective heating once or several times to information-wise transfer dye or mixture of dyes in register. The density can also be increased according to the method described in EP-A 90200930.7 and in the corresponding US Serial N° 07/682,387.
  • a monochromic coloured thermal dye image is made by selectively heating a first dye-donor element comprising a support having thereon a dye-binder layer and transferring a first monochromic coloured thermal dye image to a dye-image-receiving layer provided on one side of the transparent film support of a dye-receiving element, the first dye image having a certain density, and selectively heating a second dye-donor element comprising a support having thereon a dye-binder layer and transferring a second monochromic coloured thermal dye image of the same hue as that of the first dye image to a dye-image-re ⁇ eiving layer provided on the other side of the transparent film support, such that the second dye image is a mirror image of the first dye image and is in register with the first dye image to increase the density thereof.
  • a monochromic coloured dye image having a high density can be made by selectively heating a first area of a dye-donor element or a first dye-donor element comprising a support having thereon a dye layer containing a dye or a mixture of dyes, thereby transferring a first dye image to a dye-receiving element comprising a support having thereon a dye image-receiving layer and subsequently selectively heating a second area of said dye-donor element or a second dye- donor element, thereby transferring in register with the first dye image a second dye image to said dye-receiving element, wherein the first transferred dye image and the superposed second transferred dye image together yield a monochromic coloured dye image, wherein the concentration of the essential composing dyes that have a higher retransfer degree than the other essential composing dyes is higher in said second area or in said second dyer-donor element than in said first area or said first dye-donor element.
  • essential composing dyes are meant the dyes that compose or make up the monochromic dye colour and which make an essential contribution to the buildup of the density of the dye image.
  • Suitable dyes are the quinonimine dyes or naphthoquinonimine dyes having an absorption maximum in the spectral wavelength range between 570 and 700 nm e.g. the dyes described in EP-A 89201082.8 and in the corresponding US Serial N° 07/509,176, in US-A 4,987,119, and in the documents referred to therein.
  • the dyes can be present in consecutive dye areas of the dye-donor element or in different consecutively applied dye- donor elements. These dyes have then been selected such that the superposed consecutively transferred dye images together yield a monochromic coloured dye image.
  • one dye area or dye-donor element contains at least one of the essential composing dyes and another area or dye-donor element contains the other essential composing dye(s) .
  • the area or dye-donor element to be printed in the last pass then contains the essential composing dye(s) that has (have) a higher retransfer degree than the other essential composing dye(s) .
  • all the dye areas or dye-donor elements contain all the composing dyes and the area or dye-donor element to be printed in the last pass then contains the essential composing dye(s) having a higher retransfer degree than the other essential composing dye(s) in a higher concentration than the area or dye-donor element to be printed in an earlier pass.
  • some of the essential composing dyes are contained in all the dye areas or dye-donor elements and other essential composing dyes are contained in only one of the dye areas or dye-donor elements.
  • the dye layer of the dye-donor element used according to the method of the present invention is formed preferably by adding the dye or mixture of dyes, a polymeric binder medium, and other optional components to a suitable solvent or solvent mixture, dissolving or dispersing the ingredients to form a coating composition that is applied to a support, which support may have been provided first with an adhesive or subbing layer, and finally, drying the coated layer.
  • the dye layer thus formed has a thickness of about 0.2 to 5.0 ⁇ m, preferably 0.4 to 2.0 ⁇ m, and the amount ratio of dye or mixture of dyes to binder ranges from 9:1 to 1:3 by weight, preferably from 2:1 to 1:2 by weight.
  • the polymeric binder medium can be chosen from at least one of the following binders : cellulose derivatives, such as ethyl cellulose, hydroxyethyl cellulose, ethylhydroxyethyl cellulose, hydroxypropyl cellulose, methyl cellulose, cellulose nitrate, cellulose acetate formate, cellulose acetate hydrogen phthalate, cellulose acetate, cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate pentanoate, cellulose acetate benzoate, cellulose triacetate; vinyl-type resins and derivatives such as e.g.
  • polyvinyl alcohol polyvinyl acetate, polyvinyl butyral, copoly(vinyl butyral/vinyl acetal/vinyl alcohol), polyvinyl pyrrolidone, polyvinyl acetoacetal, polya ⁇ rylamide
  • polymers and copolymers derived from acrylates and acrylate derivatives such as e.g. polyacrylic acid, polymethyl methacrylate and styrene-acrylate copolymers; polyester resins; polycarbonates; copolystyrene-acrylonitrile; polysulfones; polyphenylene oxide; organosilicones such as e.g. polysiloxanes; epoxy resins and natural resins such as e.g. gum arabic.
  • cellulose acetate butyrate or copoly(styrene-acrylonitrile) is used as binder for the dye layer.
  • the dye layer may also contain other additives, such as thermal solvents, stabilizers, curing agents, preservatives, organic or inorganic fine particles, dispersing agents, antistatic agents, defoa ing agents, viscosity-controlling agents, etc., these and other ingredients being described more fully in EP-A 0,133,011, EP- A 0,133,012, EP-A 0,111,004, and EP-A 0,279,467.
  • additives such as thermal solvents, stabilizers, curing agents, preservatives, organic or inorganic fine particles, dispersing agents, antistatic agents, defoa ing agents, viscosity-controlling agents, etc.
  • any material can be used as the support for the dye-donor element provided it is dimensionally stable and capable of withstanding the temperatures involved, i.e. temperatures of up to 400°C, over a period of up to 20 ms, and provided it is yet thin enough to transmit heat applied to one side of the support through said support to the dye on the other side thereof to effect transfer to the dye-receiving element within such short periods like typically 1 to 10 ms.
  • Such materials include polyesters such as polyethylene terephthalate, polyamides, polyacrylates, polycarbonates, cellulose esters, fluorinated polymers, polyethers, polyacetals, polyolefins, polyimides, glassine paper, and condenser paper.
  • a support comprising polyethylene terephthalate.
  • the support has a thickness of 2 to 30 ⁇ m.
  • the support may also be coated with an adhesive or subbing layer, if desired. Examples of suitable subbing layers have been described in e.g. EP-A 0,433,496, EP-A 0,311,841, EP-A 0,268,179, US-A 4,727,057, and US-A 4,695,288.
  • the dye layer of the dye-donor element may be coated on the support or printed thereon by a printing technique such as a gravure process.
  • a dye-barrier layer comprising a hydrophilic polymer may also be provided in the dye-donor element between its support and the dye layer for the purpose of improving the dye transfer density by preventing wrong-way transfer of dye towards the support.
  • the dye barrier layer may contain any hydrophilic material that is useful for that purpose.
  • gelatin polyacrylamide, polyisopropyl acrylamide, gelatin grafted with butyl methacrylate, gelatin grafted with ethyl methacrylate, gelatin grafted with ethyl acrylate, cellulose monoacetate, methyl cellulose, polyvinyl alcohol, polyethylene imine, polyacrylic acid, a mixture of polyvinyl alcohol and polyvinyl acetate, a mixture of polyvinyl alcohol and polyacrylic acid or a mixture of cellulose monoacetate and polyacrylic acid.
  • Suitable dye barrier layers have been described in e.g. EP-A 0,227,091 and EP-A 0,228,065.
  • Certain hydrophilic polymers e.g.
  • the reverse side of the dye-donor element can be coated with a slipping layer to prevent the thermal imaging source e.g. a thermal printing head from sticking to the dye-donor element.
  • a slipping layer would comprise a lubricating material such as a surface-active agent, a liquid lubricant, a solid lubricant or mixtures thereof, with or without a polymeric binder.
  • the surface- active agents may be any agents known in the art such as carboxylates, sulfonates, phosphates, aliphatic amine salts, aliphatic quaternary ammonium salts, polyoxyethylene alkyl ethers, polyethylene glycol fatty acid esters, fluoroalkyl C Pain-C Intel_ aliphatic acids.
  • liquid lubricants include silicone oils, synthetic oils, saturated hydrocarbons, and glycols.
  • solid lubricants include various higher alcohols such as stearyl alcohol, fatty acids, and fatty acid esters. Suitable slipping layers have been described in e.g.
  • the slipping layer may advantageously comprise a styrene-acrylonitrile ⁇ opolymer or a styrene-acrylonitrile-butadiene copolymer or a mixture thereof as binder and a polysiloxane-polyether copolymer or polytetrafluoroethylene or a mixture thereof as lubricant in an amount of 0.1 to 10 % by weight in respect of the binder or mixture of binders.
  • the slipping layer comprises a polycarbonate derived from a bis-(hydroxyphenyl)-cycloalkane (diphenol) e.g 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane as described in EP-A 92202304.9 and in the corresponding US Serial N° 07/921,087.
  • diphenol bis-(hydroxyphenyl)-cycloalkane
  • the support of the dye-receiving element usually is a transparent film of e.g. polyethylene terephthalate, a polyether sulfone, a polyimide, a cellulose ester, or a polyvinyl alcohol-coacetal. Blue-coloured polyethylene terephthalate film can also be used as support.
  • the transparent dye-receiving element may optionally carry at least one back layer, at least one of which may comprise matting (agents) .
  • the support of the dye-receiving element may be a transparent film as described above but alternatively it may be any of the known opaque supports e.g. any of the above-mentioned film materials comprising an opaquing pigment or dye or mixtures thereof.
  • the transferred monochromic coloured dye image is read by reflected light.
  • the dye-image-receiving layer may comprise e.g. a polycarbonate, a polyurethane, a polyester, a polyamide, polyvinyl chloride, polystyrene-co-acrylonitrile, polycaprolactone, or mixtures thereof. Suitable dye-receiving layers have been described in e.g.
  • the dye-image- receiving layer may also comprise a cured binder such as the heat- cured product of copoly(vinyl chloride/vinyl acetate/vinyl alcohol) and polyisocyanate.
  • a cured binder such as the heat- cured product of copoly(vinyl chloride/vinyl acetate/vinyl alcohol) and polyisocyanate.
  • UV absorbers, singlet oxygen quenchers such as HALS-compounds (Hindered Amine Light Stabilizers) and/or antioxidants may be incorporated into the dye image-receiving layer.
  • the dye layer of the dye-donor element and/or said dye-image-receiving layer of the dye-receiving element may also contain at least one releasing agent that aids in separating the dye-donor element from the dye-receiving element after transfer or said dye layer and/or said dye-image-receiving layer may also be covered at least partially by a separate layer incorporating at least one releasing agent. Such layer is called a release layer.
  • Solid waxes, fluorine- or phosphate-containing surface-active agents and silicone oils can be used as releasing agents.
  • Other suitable releasing agents have been described in e.g. EP-A 0,133,012, JP 85/19138, and EP-A 0,227,092.
  • the thermal dye sublimation transfer process comprises placing the dye layer of the dye-donor element in face-to-face contact with the dye image-receiving layer of the dye-receiving element and information-wise heating from the back of the dye-donor element.
  • the transfer of the dye or mixture of dyes is accomplished by heating for about several milliseconds at a temperature of about 400°C.
  • the process steps described above are performed sequentially for each dye area or dye- donor element, if more than one dye area or dye-donor element are used.
  • the above sandwich of dye-donor element and dye- receiving element is formed on several occasions during the time when heat is applied by the thermal imaging source e.g. a thermal printing head.
  • the elements are peeled apart.
  • the second dye area of the dye-donor element or the second dye-donor element is then brought in register with the dye-receiving element and the process is repeated.
  • the dye- receiving element can optionally be reheated integrally in order to increase the diffusion of the transferred dyes into the dye image- receiving layer as described in EP-A 0,381,740 and EP-A 0,097,493.
  • the thermal imaging source can be a thermal printing head, laser light, infrared flash, heated pens or any other heat source for supplying heat energy.
  • Thermal printing heads that can be used to transfer dye from the dye-donor elements to a dye-receiving element are commercially available.
  • the dye layer or another layer of the dye-donor element should contain a compound that absorbs the light emitted by the laser and converts it into heat.
  • a suitable compound is e.g. carbon black.
  • the support of the dye-donor element may be an electrically resistive ribbon consisting of e.g. a multilayer structure of a carbon-loaded polycarbonate coated with a thin aluminum film.
  • Current is injected into the resistive ribbon by electrically addressing a printing head electrode resulting in highly localized heating of the ribbon beneath the relevant electrode.
  • the fact that in this case the heat is generated directly in the resistive ribbon and that it is thus the ribbon that gets hot leads to an inherent advantage in printing speed using the resistive ribbon/electrode head technology as compared with the thermal head technology, according to which the various elements of the thermal head get hot and have to cool down before the head may move to the next printing position.
  • Dye-donor elements for use according to thermal dye sublimation trans er were prepared as follows.
  • a polyethylene terephthalate support RE5 made by Kalle Hoechst and having a thickness of 5 ⁇ m was provided first with a subbing layer and next with a dye layer.
  • the subbing layer composition was prepared by dissolving 10 g of Dynapoll L206 (H ⁇ ls) and 15 g of 1,2-dihydroxybenzene in 997.5 g of ethyl methyl ketone.
  • the resulting subbing layer composition was applied to the support by means of an engraved cylinder having a gravure depth of 30 ⁇ m and 70 lines/cm.
  • a dye layer composition was applied by means of another engraved cylinder having a gravure depth of 68 ⁇ m and 70 lines/cm.
  • the dye layer composition comprised 50 g of the magenta dye M, 30 g of the cyan dye C, 25 g of the yellow dye Y, 25 g of n-dodecane- 1,2-diol, 50 g of the binder Luran 388 S of BASF, and a sufficient amount of the solvent ethyl methyl ketone to make a total weight of 1000 g.
  • the dyes M, C, and Y have the following structural formulae respectively.
  • the other side of the polyethylene terephthalate support was coated first with a subbing layer and next with a back layer. Each of these layers was printed by means of an engraved cylinder having a gravure depth of 25 ⁇ and 100 lines/cm.
  • the subbing layer composition was a solution in ethyl methyl ketone comprising 15 g of 1,2-dihydroxybenzene and 15 g of Desmocol 540 (Bayer) per 1000 g of solution.
  • the back layer composition was a solution in ethyl methyl ketone comprising 130 g of Luran 388 S (BASF) and 10 g of Tegoglide 410 (Goldschmidt) per 1000 g of solution.
  • BASF Luran 388 S
  • Tegoglide 410 Goldschmidt
  • One side of a polyethylene terephthalate support as described above was provided first with a subbing layer and next with a dye layer.
  • the subbing layer composition was the same as that of the above black-and-white dye-donor element.
  • the dye layer composition was applied also by means of an engraved cylinder having a gravure depth of 68 ⁇ m and 70 lines/cm as in the case of the black-and- white dye-donor element.
  • the dye layer composition comprised 50 g of the magenta dye M, 30 g of the cyan dye C, 22.5 g of n-dodecane-l,2-diol, 50 g of the binder Luran 388 S of BASF, and a sufficient amount of the solvent ethyl methyl ketone to make a total weight of 1000 g.
  • the other side of the polyethylene terephthalate support was coated with a subbing layer and a back layer as described for the black-and-white dye-donor element.
  • One side of a subbed blue polyethylene terephthalate support having a thickness of 175 ⁇ m was provided according to a common coating technique e.g. by dip-coating with a layer comprising in dried condition 3.6 g of Vinylite VAGD (Union Carbide) and 0.86 g of Desmodur VL (Bayer) per m2.
  • a release layer was coated thereon and comprised in dry condition 0.45 g of Vinylite VAGD (Union Carbide), 0.2 g of Tegomer HSI 2111 (Goldschmidt), and 0.36 mg of dibutyltin dilaurate per m2.
  • the black-and-white dye-donor element was placed in face-to-face contact with the dye-image-receiving layer of a dye-receiving element as described above and fed through a Mitsubishi CP 100 E printer, the energy values being varied between 0 and 63.
  • the colour dye-donor element was used for printing in exactly the same way as the black-and-white dye-donor element.
  • the discernibility content under white-light-viewing-conditions is markedly improved in the higher density values of the monochromic colour dye image as compared to that of the black-and-white dye image and that the discernibility content under red-light-viewing-conditions (light absorbed by the monochromic colour dye image is improved in the lower density range (visual increase in contrast in the lower density portions) when compared with white light inspection.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

Un procédé de transfert par substitution de teinture thermique est décrit; il est destiné à la fabrication d'une image colorée monochrome, teintée thermiquement destinée aux diagnostics et à l'archivage médical; ledit procédé comprend la fourniture et la représentation électrique d'une image médicale obtenue depuis une source de diagnostic quelconque vers une source d'image thermique pour chauffer sélectivement, par rapport à ladite représentation électrique, un élément-donneur de teinture comprenant un support ayant sur lui une couche contenant une (des) teinte(s) capable de transférer la chaleur et par la même de transférer selon information la (les) teinte(s) depuis ledit élément-donneur vers un élément-récepteur amené en contact face à face avec ledit élément-donneur et comprenant un support ayant sur lui une couche réceptrice d'image teintée. Dans ce procédé la (les) teinte(s) transférée(s) selon information forme dans ladite couche réceptrice d'image teintée, une image colorée monochrome absorbant principalement dans les deux premières zones des couleurs spectrales.
PCT/EP1992/002637 1991-11-25 1992-11-13 Procede de fabrication d'une image coloree monochrome, teintee thermiquement WO1993010978A1 (fr)

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EP91203076 1991-11-25
EP91203076.4 1991-11-25

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734735A (en) * 1969-08-22 1973-05-22 Agfa Gevaert Nv Colour radiography
US4346449A (en) * 1976-09-16 1982-08-24 Energy Conversion Devices, Inc. Data storage and retrieval system
EP0394460A1 (fr) * 1988-08-13 1990-10-31 Dai Nippon Insatsu Kabushiki Kaisha Support d'enregistrement sensible a la chaleur
EP0452566A1 (fr) * 1990-04-17 1991-10-23 Agfa-Gevaert N.V. Procédé pour la production d'images transparentes de colorant par transfert thermique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3734735A (en) * 1969-08-22 1973-05-22 Agfa Gevaert Nv Colour radiography
US4346449A (en) * 1976-09-16 1982-08-24 Energy Conversion Devices, Inc. Data storage and retrieval system
EP0394460A1 (fr) * 1988-08-13 1990-10-31 Dai Nippon Insatsu Kabushiki Kaisha Support d'enregistrement sensible a la chaleur
EP0452566A1 (fr) * 1990-04-17 1991-10-23 Agfa-Gevaert N.V. Procédé pour la production d'images transparentes de colorant par transfert thermique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 272 (M-724)(3119) 28 July 1988 *
RESEARCH DISCLOSURES no. 320, December 1990, EMSWORTH, GB W.JANSSENS ET AL 'Thermal dye transfer' *

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