Method for producing a particular photoluminescent polychromatic printed image, resulting image and uses
First Claim
1. In a process for producing a photoluminescent printed polychromatic image (8) invisible under illumination in visible light and visible under illumination by at least one source (14) of invisible light, comprising:
- choosing or producing by subtractive synthesis an original polychromatic image (1), visible in visible light, producing and recording at least one set of at least three images, known as filtered images (6a, 6b, 6c), by filtering the original image (1), printing separately one after the other and one above the other at least one set of at least three images, known as printed images (8a, 8b, 8c), by using and reproducing respectively one of the filtered images (6a, 6b, 6c), with a printing composition containing a photoluminescent pigment, the different photoluminescent pigments of the different printed images of the same set emitting, under illumination by at least one source (14) of invisible light, colors capable of forming all the colors of the visible spectrum by additive synthesis;
the improvement comprising;
producing filtered images, known as monochromatic filtered images (6a, 6b, 6c), by filtering the original image (1) in a spectral pass-band lower than or equal to 15 nm centred on a wavelength, known as the filtering wavelength, chosen from the wavelengths of at least three fundamental colors, the different filtering wavelengths of the monochromatic filtered images being distinct in pairs and being such as to enable all the colors of the visible spectrum to be formed by additive synthesis, 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 source (14) of invisible light, and printing each printed image, known as the monochromatic printed image (8a, 8b, 8c), by using and reproducing one of the monochromatic filtered images (6a, 6b, 6c) with a printing composition containing a photoluminescent pigment having an emission peak wavelength under illumination by at least one source (14) of invisible light, which is at least approximately equal to the filtering wavelength used for obtaining the said monochromatic filtered image (6a, 6b, 6c).
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Abstract
A process for producing any photoluminescent printed polychromatic image (8), and the image obtained thereby. At least one set of at least three monochromatic filtered images (6a, 6b, 6c) is prepared from any original polychromatic image (1) visible in visible light which is filtered with a spectral pass-band below or equal to 15 nm, according to at least three wavelengths of fundamental colors equal to the wavelengths of the luminescent pigments used, with the corresponding monochromatic filtered images (6a, 6b, 6c), in order to print separately, one above the other, three monochromatic printed images (8a, 8b, 8c). The invention concerns the image obtained, a protective device and a document carrying such an image.
203 Citations
34 Claims
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1. In a process for producing a photoluminescent printed polychromatic image (8) invisible under illumination in visible light and visible under illumination by at least one source (14) of invisible light, comprising:
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choosing or producing by subtractive synthesis an original polychromatic image (1), visible in visible light, producing and recording at least one set of at least three images, known as filtered images (6a, 6b, 6c), by filtering the original image (1), printing separately one after the other and one above the other at least one set of at least three images, known as printed images (8a, 8b, 8c), by using and reproducing respectively one of the filtered images (6a, 6b, 6c), with a printing composition containing a photoluminescent pigment, the different photoluminescent pigments of the different printed images of the same set emitting, under illumination by at least one source (14) of invisible light, colors capable of forming all the colors of the visible spectrum by additive synthesis;
the improvement comprising;
producing filtered images, known as monochromatic filtered images (6a, 6b, 6c), by filtering the original image (1) in a spectral pass-band lower than or equal to 15 nm centred on a wavelength, known as the filtering wavelength, chosen from the wavelengths of at least three fundamental colors, the different filtering wavelengths of the monochromatic filtered images being distinct in pairs and being such as to enable all the colors of the visible spectrum to be formed by additive synthesis, 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 source (14) of invisible light, and printing each printed image, known as the monochromatic printed image (8a, 8b, 8c), by using and reproducing one of the monochromatic filtered images (6a, 6b, 6c) with a printing composition containing a photoluminescent pigment having an emission peak wavelength under illumination by at least one source (14) of invisible light, which is at least approximately equal to the filtering wavelength used for obtaining the said monochromatic filtered image (6a, 6b, 6c). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 34)
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22. In a photoluminescent printed polychromatic image invisible under illumination in visible light and visible under illumination by at least one source (14) of invisible light, including at least one set of at least three images, known as printed images (8a, 8b, 8c), printed one above the other, each printed image (8a, 8b, 8c) including a photoluminescent pigment emitting a color under illumination by a source of invisible light, the different colors of the printed images (8a, 8b, 8c) of the same set being such as to be able to form by additive synthesis all the colors of the visible spectrum under illumination by at least one source (14) of invisible light;
- the improvement in which each printed image, known as the monochromatic printed image (8a, 8b, 8c), corresponds to the filtration of an original polychromatic image (1) by subtractive synthesis visible in visible light, in a spectral pass-band below or equal to 15 nm centred on a wavelength, known as the filtration wavelength, chosen from the wavelengths of at least three fundamental colors, the different filtering wavelengths being distinct in pairs and adapted so that they can form all the colors of the visible spectrum by additive synthesis, each of these filtering wavelengths being at least approximately equal to a wavelength of an emission peak of the photoluminescent pigment of the corresponding monochromatic printed image (8a, 8b, 8c).
- View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
Specification