WO2000024587A1 - Procede de realisation d'une image polychromatique imprimee photoluminescente quelconque, image obtenue et applications - Google Patents
Procede de realisation d'une image polychromatique imprimee photoluminescente quelconque, image obtenue et applications Download PDFInfo
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- WO2000024587A1 WO2000024587A1 PCT/FR1999/002573 FR9902573W WO0024587A1 WO 2000024587 A1 WO2000024587 A1 WO 2000024587A1 FR 9902573 W FR9902573 W FR 9902573W WO 0024587 A1 WO0024587 A1 WO 0024587A1
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- image
- monochromatic
- visible light
- printed
- images
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/14—Multicolour printing
- B41M1/18—Printing one ink over another
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/06—Veined printings; Fluorescent printings; Stereoscopic images; Imitated patterns, e.g. tissues, textiles
Definitions
- the invention relates to a process for producing any photoluminescent printed polychromatic image (that is to say which can incorporate all the shades of colors and of various shapes including possibly continuous color variations (gradations, fades, etc.). .) shadows, variations in intensity, speckled effects ...) invisible under lighting in visible light, and visible under lighting by at least one source of invisible light, designated below in all the text "image polychromatic printed any luminiscent photo ".
- visible light is meant a light whose spectral composition is located in the visible spectrum, from 0.4 ⁇ to 0.8 ⁇ .
- non-visible light is meant light whose spectral composition is located outside the visible spectrum, in particular in the ultraviolet and / or infrared spectrum.
- Monochromatic photoluminescent printed markings invisible under visible light illumination and visible under non-visible light illumination are often used for authentication of documents such as banknotes.
- Different printed monochromatic markings can be juxtaposed and / or superimposed, which creates spots of colors composed in a finite number and in a discontinuous manner.
- these photoluminescent monochromatic markings do not make it possible to produce a true polychromatic printed image of any kind reproducing, with all the nuances of colors and shapes, any polychromatic image visible in visible light such as a non-rasterized photographic image digitized.
- any photoluminescent printed polychromatic image can have many interests and various applications, in particular as an authentication element and / or for decoration purposes.
- any photoluminescent printed polychromatic image can provide at least three levels of authentication: the printing of the image creates raised patterns and / or visible opalescence in visible light; under illumination in non-visible light, we can check the conformity of the image which is extremely difficult to counterfeit perfectly given its complexity and the fact that it is applied to a background of a document with other visible patterns by transparency, unless the original visible in visible light is available, the reproduction from the visible image in non-visible light does not provide the original image; spectrophotometric analysis identifies the photoluminescent components used, and therefore their authenticity.
- traditional printed polychromatic images visible in visible light are generally made in four colors (yellow, magenta, cyan, black) on a white background.
- the original image is filtered with three colored filters (blue, green, red) having a spectral bandwidth of lOO ⁇ (one third of the visible spectrum).
- the appearance of the colors on the printed image is due to the reflection of visible natural light (daylight or a lighting lamp) by the printed medium through transparent colored inks which selectively absorb the incident light according to the principle known as "material color" in subtractive synthesis.
- the support reflects two-thirds of the visible spectrum, according to a spectral composition complementary to the absorption spectrum of the ink in the visible.
- the document RJ TUITE "Fluorescent multicolor additive System” XP 002108747, PRODUCT LICENSING INDEX., N ° 84, pages 81-85, INDUSTRIAL OPPORTUNITIES LTD. HAVANT., GB ISSN: 0374-4353, April Issue, 1971 teaches to realize by printing using an engraving plate press, a multicolored fluorescent image under ultraviolet.
- the process implemented in this document consists of producing red, green and blue separation negatives from a continuous positive by exposure through a red, green and blue filter, respectively. With this process, each of the negatives not being finely filtered, the largest proportion of the surface of the final image comprises an abnormal overload of the three colors forming a dominant white. Consequently, the fluorescent image obtained is extremely pale and is in practice either invisible or a "ghost" image, despite the production of a large number of successive final layers of green ink.
- the invention therefore generally aims to allow the production of any photoluminescent printed polychromatic image.
- the invention aims to allow the reproduction in printed and photoluminescent form, of an image of polychromatic origin formed in subtractive synthesis (principle of the color of matter), any visible in visible light (printed, painted, photographic image. ..) automatically and reliably.
- the invention further aims to provide a simple and inexpensive method for quickly obtaining and reproducing such an image on an industrial scale automatically and reliably, in particular in a manner similar to traditional printing techniques, without requiring the manual creation of a tri-color positive by an artist, and providing a high quality image with high contrast.
- the invention also aims to propose applications of such a polychromatic printed photoluminescent image of any kind.
- the invention relates to a process for producing an arbitrary photoluminescent printed polychromatic image invisible under lighting in visible light, and visible under lighting by at least one non-visible light source, in which: - one chooses or realizes an image of polychromatic origin formed in subtractive synthesis (principle of the material color) visible in visible light,
- filtered images - at least one set of at least three images, called filtered images, is produced and recorded by filtering the original image
- - at least one set of at least three images, known as printed images is printed separately, one after the other and one above the other, using and reproducing one of the images respectively filtered with a printing composition comprising a photoluminescent pigment, the different photoluminescent pigments of the different printed images of the same set emitting, under lighting by at least one invisible light source, colors capable of forming by additive synthesis all the colors visible spectrum, characterized in that:
- the filtered images are produced by filtering the original image, according to a spectral bandwidth less than or equal to 15 nm centered at a wavelength, called the filtering wavelength, chosen from the wavelengths of at least three fundamental colors, the different wavelengths of filtering of the monochromatic filtered images being two by two distinct, and being adapted to make it possible to form by additive synthesis all the colors of the visible spectrum, each of these filtering wavelengths being at least approximately equal to a wavelength of an emission peak of a photoluminescent pigment under illumination by at least one non-visible light source,
- each printed image is printed using and reproducing one of the filtered monochromatic images with a printing composition comprising a photoluminescent pigment having an emission peak wavelength, under illumination by at at least one non-visible light source, which is at least approximately equal to the filtering wavelength used to obtain said monochromatic filtered image.
- the wavelength of the emission peak can be throughout the passband less than or equal to 15 nm from the filtering wavelength. In other words, a certain margin of error is accepted for the wavelengths, and this margin of error is of the order of the bandwidth of the filters used.
- a method according to the invention is also characterized by at least one of the following characteristics:
- an original of the image of any polychromatic origin visible in visible light is illuminated, and the polychromatic image reflected by this illuminated original is filtered, according to a spectral bandwidth less than or equal to 15 nm centered according to the filtering wavelength of the fundamental color corresponding to the monochromatic filtered image;
- the reflected polychromatic image is filtered with bandpass filters having a spectral bandwidth of the order of lOnm, in particular with bandpass interference filters;
- the filtering wavelengths and emission peaks of the photoluminescent pigments are chosen (by selecting appropriate filtering means and photoluminescent pigments), different monochromatic printed images of the same set producing a reproduction of an original image, at least one wavelength in green, at least one wavelength in red, and at least one wavelength in blue; advantageously, one chooses wavelengths adapted to be separated by the same spectral distance between 80 nm and 100 nm, in particular equal to 90 nm; in particular a wavelength in the green between 520 and 570nm, a wavelength in the red between 610 and 680nm, and a wavelength in the blue between 430 and 480nm; - the monochromatic printed images are printed so that, in the order of reception of the lighting light, they are presented in the blue, red, green order of the filtering wavelengths and of the emission peaks photoluminescent pigments; the monochromatic printed images are printed one on top of the other without an intermediate layer; - for the same game producing a reproduction of an original polychromatic image
- the filtered image is captured with photosensitive means with CCD charge transfer and a corresponding digitized image is recorded; a raster image is formed from each monochromatic filtered image, which is then used to print the monochromatic printed image; advantageously, the raster image has a screen from 60 to 133, in particular of the order of 80 (this value corresponding to the number of lines of dots per inch (2.54 cm); the various monochromatic printed images are printed with a same clearance at least substantially according to the same printing thickness; each monochromatic printed image is printed so that the quantity of photoluminescent pigment at each point is a function of the light intensity of the image of polychromatic origin at this point according to the corresponding filtering wavelength (this function being proportional in the case of a positive, and inversely proportional in the case of a negative); and photoluminescent pigments with a purity factor are used (ratio of the quantity of light monochromatic according to the dominant wavelength of the emission peak on the sum of this amount
- each monochromatic printed image is allowed to dry and / or harden after having printed it and before printing another monochromatic printed image;
- photoluminescent pigments are used under lighting by a single invisible source of light; as a variant, to produce the same set of monochromatic printed images, at least one first photoluminescent pigment is used under illumination by at least one first source of invisible light, and at least one second photoluminescent pigment is illuminated by at least one second source non-visible light of wavelength (s) distinct from that (s) of the first non-visible light source;
- a first set of positive monochromatic printed images is printed with luminescent photo pigments under lighting by a first non-visible light source - notably ultraviolet or infrared -
- a second set of negative monochromatic printed images is printed with photoluminescent pigments under lighting by a second non-visible light source of wavelength distinct from that of the first non-visible light source - notably infrared or ultraviolet -;
- the wavelengths of the emission peaks of the photoluminescent pigments used to print the first set are at least approximately equal to the wavelengths of the emission peaks of the photoluminescent pigments used to print the second set, so that the same monochromatic filtered images can be used to print both sets;
- At least one image is printed with a printing composition comprising at least one pigment having at least one emission peak wavelength situated in the infrared range but no emission in the range visible light when this pigment is activated by lighting under a visible light source;
- the infrared image is a monochrome image which can be of the same nature (positive or negative) as the monochromatic printed images or, preferably, of opposite nature; it is also possible to provide a first positive set and a second negative set, as indicated above, and a positive or negative infrared image;
- a printing composition which incorporates a photoluminescent pigment, but which is, at least after drying, transparent or translucent for visible light when it is placed under lighting by the non-light source visible or by each of the non-visible light sources; in addition, advantageously, for printing each monochromatic printed image, a printing composition is used which, at least after drying, is transparent or translucent for visible light when it is placed under visible light lighting;
- the monochromatic printed images are printed by screen printing; advantageously, a printing composition is used which is formed from a serigraphic varnish for polymerization under ultraviolet rays; a screen printing screen is produced from each monochromatic filtered image, and the various screen printing screens are produced from the same fabric;
- Photoluminescent pigments are used under lighting by at least one non-visible light source whose spectral composition is located in the ultraviolet or infrared range;
- mineral photoluminescent pigments are used, in particular from the rare earth family; alternatively, organic photoluminescent pigments are used with better transparency (less opalescence) but which are less durable than mineral pigments;
- the monochromatic printed images are successively printed on the free external face of a transparent film in the visible comprising at least one layer formed by a continuous printing of a printing composition, for example a film as described in EP- 0 271 941 or US-5,232,527.
- the invention thus makes it possible for the first time to automatically obtain any polychromatic printed photoluminescent image which is a faithful reproduction, with all the nuances of colors and the shapes which can vary infinitely continuously, from a original of any polychromatic image visible in visible light.
- This original can be printed or a stored analog image (photographic, cinematographic, video ...), or a digitized image stored on a computer mass memory or other. It should be noted that this result is obtained by implementing not broadband filtering as in traditional printing, but on the contrary a selective narrowband filtering in visible light and a three-color additive synthesis under lighting in non-visible light.
- the invention also extends to the printed image obtained by a method according to the invention.
- the invention therefore relates to any photoluminescent printed polychromatic image invisible under lighting in visible light, and visible under lighting by at least one non-visible light source, comprising at least one set of at least three images, called printed images, printed one above the other, each printed image comprising a photoluminescent pigment emitting a color under lighting by a non-visible light source, the different colors of the printed images of the same set being adapted so as to be able to form by additive synthesis all the colors of the spectrum visible under lighting by at least one non-visible light source, characterized in that each printed image, called monochromatic printed image corresponds to the filtering of a polychromatic image in subtractive synthesis visible in visible light, according to a spectral bandwidth less than or equal to 15 nm centered on a wavelength , called filtering wavelength, chosen from the wavelengths of at least three fundamental colors, the different lengths filter wavelength being two by two distinct and adapted to allow to form by additive synthesis all the colors of the visible spectrum, each of these filter wavelengths being at least approximately equal to
- an image according to the invention is also characterized by at least one of the following characteristics: it comprises at least one printed monochromatic image having at least one emission peak wavelength in the green, at least one image monochromatic print having at least one emission peak wavelength in red, and at least one monochromatic print image having at least one emission peak wavelength in blue; for the same set of monochromatic printed images reproducing an original image, it includes three monochromatic printed images, one in green, one in red and one in blue;
- the wavelengths of the emission peaks of the monochromatic printed images are separated by the same spectral distance between 80 nm and 100 nm, in particular of the order of 90 nm; advantageously, it comprises a printed monochromatic image having a wavelength of emission peak in the green between 520 and 570nm, a monochromatic image having a wavelength of emission peak in the red between 610 and 680nm , and a monochromatic printed image having a blue emission peak wavelength between 430 and 480nm;
- each monochromatic printed image is formed of a printing composition which is transparent or translucent for visible light when it is placed under illumination by the non-visible light source or by each of the non-visible light sources, and which incorporates a photoluminescent pigment; each monochromatic printed image is formed of a printing composition which is transparent or translucent for visible light when placed under visible light illumination;
- the luminescent photo pigments of at least one and the same set of monochromatic printed images emit under illumination by at least one source of non-visible light whose spectral composition is located in the ultraviolet or infrared range;
- the various monochromatic printed images of the same set include photoluminescent pigments emitting under lighting by at least one source of non-visible monochromatic light;
- the various photoluminescent pigments of at least one and the same set of monochromatic printed images are adapted to present a wavelength of emission peak under lighting by one and only one and the same source of non-visible light;
- at least one first pigment is photoluminescent under lighting by at least one first source of invisible light
- at least one second pigment is photoluminescent under lighting by at least one second non-visible light source of wavelength (s) distinct from that (s) of the first non-visible light source;
- - it includes a first set of positive monochromatic printed images comprising photoluminescent pigments under lighting by a first source of non-visible light - notably ultraviolet or infrared- and adapted to reproduce in additive synthesis, a positive of an image of polychromatic origin, and a second set of negative monochromatic printed images comprising photoluminescent pigments under lighting by a second source of invisible light of lengths wave distinct from that of the first non-visible light source - notably infrared or ultraviolet - and adapted to reproduce in additive synthesis, a negative of an image of polychromatic origin; these two sets can be superimposed and are reproductions of the same image of polychromatic origin, one in negative and the other in positive; alternatively, they are reproductions of two images of different origin;
- this infrared image further comprises at least one image, called an infrared image, visible in the infrared range but invisible in the field of visible light under lighting by a visible light source; this infrared image can be a reverse reproduction of a reproduction of an image of polychromatic origin produced by a set of monochromatic printed images on the same support, and can be superimposed on this set.
- the invention also extends to the applications of an image according to the invention.
- the invention extends in particular to the application of an image according to the invention for the protection of a document, in particular a passport, an identity card, a driving license, a vehicle registration card or other official identification and / or authentication document, a fiduciary document such as a bank note, check, card or other payment instrument.
- the invention thus relates to a document protection device comprising at least one transparent protective film making it possible to cover and protect at least one surface portion of a document, in which the film comprises at least one image according to the invention.
- the invention also relates to a document - in particular a passport, an identity card, a driving license, a vehicle registration card or other official document of identification and / or authentication, a fiduciary document, a bank note, a check, a card or other payment instrument comprising at least one image according to the invention.
- at least one image according to the invention is carried by at least one transparent protective film applied to at least one face of the document.
- the invention also relates to a process, any photoluminescent printed polychromatic image, a protection device and a document characterized in combination for all or part of the characteristics mentioned above or below.
- FIG. 1 is a diagram illustrating an installation allowing the implementation of a method according to the invention
- FIG. 2 is a diagram illustrating various stages of a method according to the invention
- FIG. 3 is a diagram showing an example of a document protected by a protection device according to the invention, seen lit in visible light,
- Figure 4 is a diagram showing the document of Figure 3 illuminated in non-visible light.
- a polychromatic original image 1 is represented, colored according to the principle of the material color (subtractive synthesis), visible in visible light such as a photograph or an image printed in traditional four-color process, as desired. reproduce with all shades of color and shape, obtaining any photoluminescent printed polychromatic image invisible under lighting in visible light and visible under lighting by at least one non-visible light source.
- An original of this original image 1 is illuminated from a visible light source 2 such as an incandescent lamp or daylight.
- Light illuminating the original image 1 is visible white light which is reflected by the original image 1 towards a CCD camera 3 connected to a microcomputer 4 making it possible to memorize the images captured by the camera 3.
- a bandpass filter 5 is interposed.
- This filter 5 is chosen from at least three interference filters 5a, 5b, 5c bandpass whose spectral bandwidth is less than 15nm - in particular of the order of lOnm-, and whose filtering wavelength is chosen at less approximately equal to the wavelength of an emission peak of a photoluminescent pigment under lighting by at least one non-visible light source, this pigment being moreover adapted to be able to allow subsequent printing of the image polychromatic, that is to say to be compatible with the printing means and techniques used as described below.
- the filtering wavelengths are chosen from the wavelengths of at least three fundamental colors which can form all the colors of the visible spectrum by additive synthesis. In particular, three wavelengths are sufficient provided that each fundamental color cannot be balanced by the other two. It is also possible to use more than three wavelengths.
- the monochromatic image from filter 5 is a contrasted monochromatic filtered image.
- Camera 3 is therefore a monochrome camera.
- Three monochromatic filtered images 6a, 6b, 6c are thus produced, with, respectively, each of the three filters 5a, 5b, 5c, monochromators from the same original image 1.
- These three monochromatic filtered images 6a, 6b, 6c are digitized images recorded in the microcomputer 4.
- Each monochromatic filtered image 6a, 6b, 6c captured and digitized by the CCD camera 3 is recorded by the microcomputer 4.
- the image of polychromatic origin may be a recorded digital image and digital filtering means are used to produce, by software calculation, each monochromatic filtered image 6a, 6b, 6c.
- These printing screens 7a, 7b, 7c are each formed of a film carrying a contrasting image, the density of screen points at each point of the image corresponds to the light intensity of the polychromatic image which is wish to reproduce.
- the density of halftone dots at each point of the contrasted image of the print halftone which is in negative corresponds to the light flux the original polychromatic image 1 reflected at this point, respectively according to each filtering wavelength. It is therefore necessary in this case to invert the filtered monochromatic images 6a, 6b, 6c, which are positive, in order to obtain negative screens for screen printing 7a, 7b, 7c.
- This reversal can be carried out either by the software for capturing the image by the CCD3 camera, or using traditional image processing software from the scanned and recorded images, or by the image processing software. the flashing machine for producing the printing frames.
- the printing screens 7a, 7b, 7c are produced on transparent films then making it possible to produce, by exposure to a photopolymer, screen printing screens, one for each monochromatic filtered image 6a, 6b, 6c.
- Each screen printing screen is produced for example from a fabric whose mesh comprises 165 threads / cm, the threads having a diameter of 27 ⁇ .
- a layer of photopolymer material 18 ⁇ thick is used.
- Each screen screen is thus representative, for each filtering wavelength, of a light flux reflected by the original polychromatic image 1 in the filtering wavelength corresponding to the filter used, or of the inverse of this luminous flux.
- the printing medium 9 can be of any kind as long as it is compatible with the printing technique used.
- this printing support 9 is itself non-photo luminescent, in particular devoid of optical brightener, so as not to disturb the chromatic balance of the image 8 to be formed.
- the screen screen produced from one of the monochromatic filtered images 6a, 6b, 6c is used and a transparent printing composition comprising a photoluminescent pigment the length of which emission peak wave, under lighting by at least one non-visible light source 14, is equal to the filtering wavelength used to obtain said monochromatic filtered image.
- a transparent printing composition comprising a photoluminescent pigment the length of which emission peak wave, under lighting by at least one non-visible light source 14, is equal to the filtering wavelength used to obtain said monochromatic filtered image.
- mineral pigments are used, in particular chosen from rare earths, which are well suited for being printed by screen printing, and resist radiation from the non-visible light source, which ensures resistance in the time to chromatic balance. You can also choose organic pigments whose resistance over time is a little less good, but which have better transparency.
- bandpass interference filters sold by the company LOT ORIEL (Courtaboeuf, France) as mentioned in the table below, and in which are also given examples of references of corresponding photoluminescent pigments which can be used, sold by the company RIEDEL DE HAN (Germany) (RDH in the table) or the company USR OPTONICS (New Jersey, USA) (USR in the table).
- the chosen pigment is incorporated into a varnish screen printing chosen to be able to be transparent, or at least translucent, when dry and placed under lighting by the light source (s) 14 not visible, at least for the light of wavelength corresponding to the length of the emission peak of this photoluminescent pigment, and for each of the emission peak wavelengths of the photoluminescent pigment (s) of the printed image (s) ) monochromatic (s) previously printed (s) on the printing support 9.
- the light emitted by each of the photoluminescent pigments will be able to pass through the printed serigraphic varnish to be visible from the outside, and this without color imbalance.
- the concentrations of each pigment in the screen varnish can be as follows: 27% for the blue pigment, 27% for the red pigment and 13.5% for the pigment green. These values can be reduced or increased (provided that the composition can be printed) provided that the relative proportions of the different colors are respected for the chromatic balance.
- the various monochromatic printed images 8a, 8b, 8c are presented in the order 8c blue, 8b red, 8a green of the wavelengths of emission of the photoluminescent pigments, in the order of reception of the non-visible light causing this show.
- the screen printing varnish used must also be transparent for light at the wavelength of non-light source 14 visible (or sources of light not visible when several sources are used), so as to allow photoluminescence of the different pigments.
- the different monochromatic printed images 8a, 8b, 8c are printed successively, either directly one above the other, respecting a drying time between each layer, or possibly interposing between them continuous transparent layers.
- a transparent layer is for example a layer of polymerizable bicomponent printing composition containing a hydroxylated polyol and an isocyanate or a polyisocyanate so as to cause the polymerization in situ of the mixture leading to a thin transparent film of polyurethane, as described for example by EP-0 271 941 or US-5 232 527.
- the monochromatic printed images 8a, 8b, 8c are all three printed with the same printing tools (the serigraphic screens used are made from the same fabrics and with the same photopolymer material).
- the monochromatic printed images 8a, 8b, 8c are printed with the same printing thickness. This thickness is advantageously between 3 ⁇ and 12 ⁇ depending on the characteristics of the screen printing screen used, in particular and is of the order of 5 ⁇ in the example above.
- the actual thickness of the monochromatic image 8a, 8b, 8c at each point depends on the pattern of the image, as is always the case in screen printing.
- the quantity of photoluminescent pigment at each point is a function of the light intensity of the image of polychromatic origin at this point according to the corresponding filtering wavelength .
- the screen printing varnish used incorporating the photoluminescent pigment is chosen to be itself non-photoluminescent so as to allow the formation of image 8 by additive synthesis subsequently by the three pigments of the three monochromatic images 8a, 8b, 8c.
- the different monochromatic printed images 8a, 8b, 8c are transparent or translucent in visible light when they are placed under visible light illumination, so that the image 8 formed is itself, in total, transparent or translucent for visible light when it is placed under light illumination visible. In this way, it allows the visualization of any mentions 12 previously written on the support 9, by transparency.
- the screen printing varnish used is advantageously a varnish for polymerization under ultraviolet rays.
- mineral photoluminescent pigments are generally sensitive to temperature.
- the luminescent photo pigments all have the same absorption spectrum, and emit visible light according to a single emission peak under lighting by a non-visible light source 14, for example ultraviolet of wavelength equal to 365nm.
- a photoluminescent pigment whose absorption spectrum is included in long ultraviolet rays the non-visible light source being able to emit at a length of wave of around 365nm
- a photoluminescent pigment whose absorption spectrum is located in short ultraviolet the corresponding non-visible light source can emit at an emission wavelength of around 250nm
- the corresponding non-visible light source being able to emit at a wavelength of the order of 950nm.
- the advantage of using photoluminescent pigments having different absorption spectra is to require the use of several different sources of non-visible light to view the image later, which reinforce
- two successive positives can be produced on the same support 9, one visible under ultraviolet, the other under infrared. It is also possible to make more than two reproductions, by printing more than two sets of images, supe ⁇ osed or not supe ⁇ osed. The number of sets of images that can be assumed is limited by the transparency properties of the different printed layers, and by the number of different excitation light sources available.
- the different sets of monochromatic printed images can be printed successively, the two photoluminescent reproductions thus formed being superposed one on the other.
- the monochromatic printed images of the different sets can be nested. For example, you can first print the different monochromatic printed images with green pigments, then the different monochromatic printed images with red pigments, then the different monochromatic printed images with blue pigments.
- photoluminescent pigments are chosen whose wavelengths of the emission peaks are at least approximately equal, so as to use the same monochromatic filtered images 6a, 6b, 6c to produce these two photoluminescent reproductions. It suffices to invert these filtered monochromatic images during the preparation of the printing screens to obtain the polychromatic reproductions in positive, and not to carry out this inversion to obtain the polychromatic reproduction in negative.
- the emission intensities of pigments with infrared excitation being lower than those of pigments with ultraviolet excitation, the concentration of pigments with infrared excitation must be greater in the printing varnish than that of pigments with infrared excitation under ultraviolet.
- At least one image can be printed with a printing composition comprising at least one pigment, called an infrared pigment, having at least one emission peak wavelength situated in the infrared range. , but no emission in visible light, when this pigment is activated by lighting under a visible light source.
- an infrared image is a monochrome image which will be visible in the infrared range but will remain invisible in the visible light range.
- a photoluminescent polychromatic reproduction 8 is produced under ultraviolet or under infrared as indicated above which is a positive reproduction of the original image, then an infrared image which is a negative reproduction of the original image. origin.
- the infrared image is a positive while the photoluminescent polychromatic reproductions is a negative.
- the sources of excitation of the pigments being different, nothing even prevents printing on the same printing medium 9 an infrared image in positive or in negative on two polychromatic photoluminescent reproductions 8 supe ⁇ osées carried out as indicated above.
- a printing composition comprising, for example, the varnish reference CD 170 sold by the company RIEDEL DE HAN (Germany).
- the reflected image of the original image 1, captured by the CCD3 camera is used without filtering, and the steps of screening, possible inversion, flashing, exposure, revelation and printing are carried out as described above.
- the support 9 is illuminated with a visible light source.
- a light source filtered using a spectral band of 40 nm to 100 nm centered on 585 nm is used.
- the printing support 9 can be a transparent protective film or a transparent film of such a film, so that the image 8 according to the invention is carried by or inco ⁇ orated in a protective film.
- the image 8 according to the invention can be formed inside a transparent protective film as described by EP-0 271 941 or US-5 232 527.
- Figures 3 and 4 show an example of application of a transparent protective film 9 carrying a photoluminescent printed polychromatic image 8 according to the invention.
- This film 9 is applied to part of a face 13 of a document 10 to serve as a means of authentication.
- the face 13 of the document 10 is coated with an image 11 visible in visible light and with common or variable indications 12 visible by transparency through the film 9 when the latter is illuminated in visible light.
- the image 8 carried by the film 9 is not visible in visible light.
- image 8 is formed of a transparent composition in visible light, and the photoluminescent pigments do not emit light in visible light.
- photoluminescent pigments in image 8 has the consequence in practice, in general, of making it slightly whitish and translucent.
- the monochromatic printed images 8a, 8b, 8c are printed in serigraphy and with mineral pigments, the variations in thicknesses of the patterns of these different images create an opalescence on the surface (represented schematically by dotted lines in FIG. 3) allowing to distinguish certain contours of image 8, but without allowing precise vision of the contours, nor especially of the colors of the polychromatic image.
- the document 10 is illuminated by a source 14 of non-visible light corresponding to the absorption spectrum of the various photoluminescent pigments of a set of monochromatic printed images 8a, 8b, 8c of image 8. If necessary, several non-visible light sources must be used to excite the photoluminescent pigments of image 8.
- the polychromatic image 8 appears in photoluminescent manner with all of its shades of color, identical to the image. of polychromatic origin 1. Photoluminescence also creates a certain decorative and su effetrenant effect, the colors appearing with an unusual brightness and chromatic purity according to the principle of light color.
- the photoluminescent polychromatic image 8 is superimposed on the mentions 12 carried by the face 13 of the document, which are still visible by transparency through the film 9 and the image 8.
- the document 10 thus protected may be a passport, a card identity, driver's license, vehicle registration card or other official identification and / or authentication documents, a fiduciary document such as a bank note, check, card or other payment instrument.
- the film 9 can be applied to the face 13 of the document 10 of in the traditional way, by means of an adhesive layer, for example by cold dry transfer or hot rolling.
- the film 9 can itself be an anti-forgery film which can inco ⁇ or other authentication marks or prevent its reproduction by optical reading.
- the transparent image 8 being applied to the document cannot be counterfeited because of the other mentions 12 of the document or of inco ⁇ orated mentions in the film 9 which, by combining with image 8, prevent its reproduction by illumination in non-light visible and filtering.
- the photoluminescent printed polychromatic image 8 also protects the document 10 against any reproduction by optical reading in visible light, for example by photocopying or other.
- the mentions 12 of the document can themselves be formed at least in part from an image according to the invention printed on the face 13 of the document. In this case, it is advantageous to use pigments different from those of the first image for the second image.
- the invention is also applicable purely for decorative or advertising purposes to produce images 8 that are particularly aesthetic and providing a su ⁇ renant effect. Depending on whether the invisible source of light is turned on or off to excite the photoluminescent pigments, image 8 can appear or disappear, intermittently.
- a four-color A4 printed landscape image is used which is reproduced by a process according to the invention as described above on the free face of a transparent adhesive polyurethane protective film sold by the company FASVER (France) under the name FASPROTEK ®, of corresponding format.
- This transparent film is then applied to an official document to be protected bearing a pre-printed text. We see that the film does not prevent the reading of the pre-printed text.
- the screen-printed image forms opalescent reliefs visible at low incidence. It is not visible in visible white light. Under lighting by an ultraviolet lamp, the image appears with all its nuances of colors.
- the polychromatic image of the spectrum appears in positive. Under illumination by an infrared light source, the polychromatic image of the spectrum appears in negative. Under visible light lighting, no visible light image appears. Under lighting in visible light filtered at 585 nm and detection in infrared by means of a high pass filter at 800 nm by a CCD camera, an image is observed which is a monochromatic negative of the spectrum.
- the invention can be the subject of multiple variant embodiments with respect to the embodiments described and shown. In particular, other printing techniques than screen printing can be used, provided that the photoluminescent pigments used are compatible with these printing techniques.
- Printing can be carried out on a support other than a transparent film 9, and the original polychromatic image 1 can not be a photographic or printed image, but an image previously scanned in a computer system which is printed. for example using a color laser printer to allow its filtering by filters 5, or even that one filters by numerical calculation.
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Health & Medical Sciences (AREA)
- Textile Engineering (AREA)
- Vascular Medicine (AREA)
- Printing Methods (AREA)
- Glass Compositions (AREA)
- Threshing Machine Elements (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99950811A EP1042125B2 (fr) | 1998-10-23 | 1999-10-22 | Procede de realisation d'une image polychromatique imprimee photoluminescente quelconque, image obtenue et applications |
DE69917590T DE69917590T3 (de) | 1998-10-23 | 1999-10-22 | Verfahren zum herstellen eines mehrfarbigen fotolumineszierenden bildes, so hergestelltes bild und seine anwendungen |
US09/582,102 US6494490B1 (en) | 1998-10-23 | 1999-10-22 | Method for producing a particular photoluminescent polychromatic printed image, resulting image and uses |
CA002315354A CA2315354C (fr) | 1998-10-23 | 1999-10-22 | Procede de realisation d'une image polychromatique imprimee photoluminescente quelconque, image obtenue et applications |
AT99950811T ATE267710T1 (de) | 1998-10-23 | 1999-10-22 | Verfahren zum herstellen eines mehrfarbigen fotolumineszierenden bildes, so hergestelltes bild und seine anwendungen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR98/13307 | 1998-10-23 | ||
FR9813307A FR2785061B1 (fr) | 1998-10-23 | 1998-10-23 | Procede de realisation d'une image polychromatique imprimee photoluminescente quelconque, image obtenue et applications |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000024587A1 true WO2000024587A1 (fr) | 2000-05-04 |
Family
ID=9531912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1999/002573 WO2000024587A1 (fr) | 1998-10-23 | 1999-10-22 | Procede de realisation d'une image polychromatique imprimee photoluminescente quelconque, image obtenue et applications |
Country Status (8)
Country | Link |
---|---|
US (1) | US6494490B1 (fr) |
EP (1) | EP1042125B2 (fr) |
AT (1) | ATE267710T1 (fr) |
CA (1) | CA2315354C (fr) |
DE (1) | DE69917590T3 (fr) |
ES (1) | ES2221448T5 (fr) |
FR (1) | FR2785061B1 (fr) |
WO (1) | WO2000024587A1 (fr) |
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US7175206B2 (en) | 2001-09-21 | 2007-02-13 | Francois Trantoul | Anti-counterfeiting marker for affixing variable entries on a support to be marked, method and resulting mark |
FR2834484A1 (fr) | 2002-01-09 | 2003-07-11 | Francois Trantoul | Procede de realisation d'un dispositif de protection a film de securite transferable et transparent aux ultraviolets courts |
WO2011114056A2 (fr) | 2010-03-17 | 2011-09-22 | Fasver | Procédé de réalisation d'une image transparente polychromatique imprimée iridescente |
WO2013132186A1 (fr) | 2012-03-05 | 2013-09-12 | Fasver | Procédé et dispositif de protection sécuritaire de documents officiels à l'aide d'un film transparent à couche continue unique thermoplastique |
WO2014184481A1 (fr) | 2013-05-13 | 2014-11-20 | Fasver | Procédé et dispositif de protection sécuritaire d'un document officiel et document officiel ainsi protégé |
US10239336B2 (en) | 2013-05-13 | 2019-03-26 | Fasver | Method and device for the secure protection of an official document and official document thus protected |
FR3018730A1 (fr) * | 2014-03-24 | 2015-09-25 | Fasver | Document comprenant au moins deux images photoluminescentes, film de securite et procede de protection securitaire |
WO2015144646A1 (fr) | 2014-03-24 | 2015-10-01 | Fasver | Document comprenant au moins deux images photoluminescentes, film de sécurité et procédé de protection sécuritaire |
US10293629B2 (en) | 2014-03-24 | 2019-05-21 | Fasver | Document comprising at least two photoluminescent images, security film and protective security method |
WO2016071627A1 (fr) | 2014-11-04 | 2016-05-12 | Fasver | Procédé de fabrication d'un support de données et support de données ainsi obtenu |
US11090968B2 (en) | 2014-11-04 | 2021-08-17 | Illinois Tool Works Inc. | Method for manufacturing a data medium and data medium thus obtained |
Also Published As
Publication number | Publication date |
---|---|
CA2315354C (fr) | 2009-08-11 |
ES2221448T5 (es) | 2009-01-01 |
DE69917590T2 (de) | 2005-02-03 |
FR2785061A1 (fr) | 2000-04-28 |
ATE267710T1 (de) | 2004-06-15 |
DE69917590D1 (de) | 2004-07-01 |
EP1042125B2 (fr) | 2008-07-16 |
EP1042125A1 (fr) | 2000-10-11 |
FR2785061B1 (fr) | 2000-12-15 |
ES2221448T3 (es) | 2004-12-16 |
EP1042125B1 (fr) | 2004-05-26 |
DE69917590T3 (de) | 2009-01-22 |
US6494490B1 (en) | 2002-12-17 |
CA2315354A1 (fr) | 2000-05-04 |
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