Half-tint image, produced by printing method

FIELD: image printing technologies.

SUBSTANCE: required color is produced by mixing colors of image points, and on substrate fluorescent point of printing paints image are formed, which contain pigments fluorescent when excited by a certain electromagnetic emission, and also non-fluorescent image points of printing paints, containing colored pigments, non-fluorescent when excited by a certain electromagnetic emission. Aforementioned fluorescent image points and non-fluorescent image points are positioned on substrate in staggered order relatively to each other.

EFFECT: higher efficiency, higher quality.

2 cl, 4 ex

 

The invention relates to obtain a method of printing on a substrate halftone images, comprising at least two types arranged in a raster of image points of different colors, and due to the mixing of colors of the color image point get the desired color.

In the case of color halftone prints produced using conventional printing methods, for example using offset printing, gravure printing or hot stamping printing, the sensation of color occurs due to the subtractive colour mixture of four main components (in the General case, blue, yellow, Magenta, and black). When the half-tone prints such pigments for printing inks absorb from the incident white light corresponding complementary part. Unabsorbed corresponding color component of the white color is reflected and reaches the observer's eye, causing a corresponding color sensation. Each of the primary colors is thus only a part of the incident light. The brightness of the obtained halftone prints depends on the substrate on which the printed primary colors. The lighter the substrate, the lighter elements can be obtained in the halftone image.

In contrast to the above case in the tubes or on the movie screen image is formed due to the additive with which to make your decision of colors. With each point as though reproduces on the screen or in a small tube with a light source emitting a single color. If, as it takes place in the tubes, as sources of colored light choose three specific region of the visible spectrum, such as red, green or blue-violet, which are distributed over the entire region of the visible spectrum and can excite in the eye corresponding receivers colors, thereby manage using additive blending colors to create color images with the real color settings.

As a prerequisite for additive color mixing is the presence of the respective luminous points in the image, up to the present time it was not possible to use additive blending colors for printing grayscale images.

The basis of the invention lies in the task of developing a method of printing that allows you to get on the substrate halftone images, which are compared with the halftone images obtained by known methods, have high luster and close to the real colors.

The problem is solved in that when receiving a method of printing a grayscale image point of the image formed by printing inks containing pigments, fluorescent in a certain color when excited by electromagnetic irradiation is receiving. It is preferable to use a point image, which consists of three different printing inks and pigments of different printing inks were fluorescently respectively in one of the three primary colors (for example, red, green or blue-violet) for additive color mixing with almost all colors of the visible spectrum using an appropriate combination of points in the image, created by using a separate, different fluorescent pigments.

Printed halftone image according to the invention are distinguished thus from the known from the prior art printed color halftone images so that the corresponding color can be recognized only if contained in a separate printing inks pigments are excited with electromagnetic radiation of the appropriate wavelength and then flyuorestsiruyut. Upon excitation of the pigments get a grayscale image with bright and rich colors. In this regard, it should be noted that the term "ink" should be understood in its broadest sense, it includes all kinds of paints or varnishes which are suitable for receiving printed or bitmap images on the substrate. In particular, the "inks" in the sense of the invention are, for example, sublimation or lacquer coating is hot stamping foils or foils hot stamping.

Another sign of a halftone image according to the invention is that the desired color or color can be observed only in the case if a grayscale image is subjected to irradiation by electromagnetic radiation of the appropriate wavelength. This leads to the fact that the color or adjust the color halftone image is changed by changing the wavelength of the irradiating light, for example in the case of using visible and ultraviolet light. This effect can be used, for example, for forming on a substrate different images, which are alternately visible depending on the wavelength or frequency used for the irradiation of electromagnetic radiation.

For excitation of fluorescent pigments can provide various types of electromagnetic radiation. In practice, however, in the General case, it is expedient to apply the pigments that flyuorestsiruyut under the influence of ultraviolet radiation.

The invention also provides that the pixels are located on a black underlayer. This black sublayer can be formed directly in the substrate. However, black sublayer may be formed corresponding to the printing ink, and forming the sublayer printing ink can be located on the entire surface, or only in the ex is cnyh spaces between fluorescamine different color dots of the image.

A special effect can be achieved according to the invention, if at least one of the applied printing ink pigments chosen in such a way that when exposed to radiation of different frequency's fluorescent different colors. Depending on the lighting halftone image radiation get different results depending on what's fluorescent color matching pigment, and can be achieved as changing colors and changing motives depending on the irradiation frequency.

Most preferred according to the invention is the selection of sizes creates a grayscale image points in the image such that they cannot be allocated to the naked eye, what can be achieved in any case when the size of image points selected smaller than 0.3 mm In this case, the mix coming from the individual image points of colored light beams and creates the illusion of a continuous colored surface.

In case of application for protective purposes can be used for special benefits in case of presence on the substrate, on the one hand, the fluorescent image pixel containing fluorescing when excited by certain electromagnetic radiation pigments for printing inks, and on the other hand, effluorescence point of the picture is the I color, containing effluorescence when excited by certain electromagnetic radiation pigments for printing inks. Under "effluorescence points of the image" should not be understood that the employees to create these points in the image printing inks absolutely not flyuorestsiruyut. The we can talk about the points in the image, consisting of printing inks, pigments which flyuorestsiruyut exactly when excited by some of the electromagnetic radiation, and not at certain excitation electromagnetic radiation that causes fluorescence of the fluorescent point of the image. If a grayscale image of this kind is composed of the fluorescent image points and effluorescence points in the image, depending on the exposure in each case receive a different effect, since the irradiation causes the excitation of the fluorescent image point by electromagnetic radiation of the fluorescent point of the image, respectively glow and create a grayscale image, while the irradiation of various radiation grayscale image to create the so-called effluorescence point of the image. Thus, it is possible, for example, to achieve that, when irradiated with ultraviolet light through a fluorescent pigments creates p is pout color sensation while when daylighting and correspondingly small part of the ultraviolet radiation is set different color sensation.

Fundamentally possible are fluorescent point of the image, on the one hand, and effluorescence point of the image, on the other hand to provide on the substrate respectively on separate sites. It is more appropriate to fluorescent point of the image, on the one hand, and effluorescence point of the image, on the other hand, were provided on a substrate arranged in staggered relation to each other, as in this case, the same having fluorescent and effluorescence point of the image portion of the surface of the substrate are different, depending in each case on the lighting effects.

Further, provided that the fluorescent point of the image represent the first image, and effluorescence point of the image is the second image. For example, could thus make two copies of identity card with a portrait of its owner, and the first document can be represented as a normal grayscale image using a mixture of colors blue, Magenta, and yellow (and optionally black), whileas the second portrait can be manufactured using additive color mixing of inks, containing pigment, fluorescence, for example, by ultraviolet light. This way you can significantly increase the reliability of the document and at the same time to create a simple algorithm to verify the authenticity in the process which should only check whether obtained by subtractive color mixing portrait of the holder with a portrait made by positive mixing colors fluorescent colors appear when illuminated with specific electromagnetic radiation. Obtaining such images with normal, causing subtractive color mixing pigments and fluorescent causing additive color mixing pigments can be easily realized, for example by hot stamping printing, which in this case should provide the necessary number of colors for printing pixels.

Halftone images according to the invention can be used for various purposes. Especially preferred is the use of the corresponding grayscale image as an element of protection for valuable files, documents, in particular securities, banknotes and identity, or for valuable items. For example, it is possible to provide a banknote, a check, or other securities of the corresponding halftone printing, and in this case, the desired color effect is oznachaet only when illuminated with an appropriate light. For example, you can accomplish what is available on the banknote or other security feature displays special color effect only during the irradiation of the banknote UV light of a certain frequency, while under normal light has a slightly grayish glare, does not allow to recognize the contours or other items printed halftone images with this type of lighting. With appropriate choice of fluorescent pigments and, if necessary, adding effluorescence pigments in printing inks, it is also possible to obtain reflected in the normal white or light gray halftone image when illuminated by light of a specific wavelength, in particular UV light, due to the fluorescence shows then intense colors. This effect (alternating black and white image and color image) is particularly relevant as easily recognizable element of reliability.

The greatest effect of protection can be achieved by combining the document two images, the first of which is a normal halftone color image, and the second can be grasped only through fluorescence when illuminated by light, or irradiation with electromagnetic radiation of a certain wavelength, and special effectsmay is achieved by using two in principle, matching images, which are then respectively compared with each other.

To simplify the application of the corresponding elements of reliability on valuable business is preferable, if a grayscale image is formed on portable protect the decorative object layer conversion foil, in particular foil hot stamping or hot stamping foil. A grayscale image can be easily produced as part of the conversion foil conventional printing methods, and then in the form of such labels spots, strips, etc. a simple way to carry on a securable object. In this case, the user is able to obtain remedies in more or less finished form, and in the future may only require a relatively simple device to transfer item reliability with conversion foil to protect the object.

Finally, in the case of applying the respective halftone images as elements of protection of objects of a grayscale image is combined with an optical effect element, such as lattice structure, a hologram having a high gloss reflective surface, purposefully frosted area or causing a change in color or transparency of the thin layers.

On Delta themselves halftone images according to the invention is associated with significant difficulties, because it is difficult to find the exact combination of pigments, a substance carrier varnish and wavelength of electromagnetic radiation. Fake is difficult even more so, if, in addition, are in principle already known as a difficult faked providing the optical effect of the elements. This is, first of all, in the case where a color halftone image according to the invention and providing the optical effect of the structure directly adjoin one element of protection or even embedded into each other. In this case, the required manufacturing methods that make counterfeiting virtually impossible. In addition, even more opportunities protection and control. Using a grayscale image, on the one hand, and providing the optical effect element, on the other hand, it is possible to provide consistent and complementary standards, which opens up additional possibilities of control as in the case of normal lighting and light with a specific wavelength, and these control options can be combined so that they could easily learn to untrained users.

As was shown above, the halftone image according to the invention may have wide application. For example, there is a possibility of the otopleniya relatively large area of the halftone images printed on large format devices, in order to produce large prints, for example, fluorescent in ultraviolet light, which can be used to create special effects, for example, in the advertising business. Halftone images according to the invention can be used in the posters or the like, the contents of which are recognizable only when exposed to the appropriate light, such as ultraviolet rays, and these posters are different from known up to the present time, fluorescent in ultraviolet radiation elements so that in fact they get a color halftone image, providing a wide range of design options. In a wide range of opportunities and the cost of manufacturing such media are relatively low.

In further detail explained some of the principles and examples of halftone printing according to the invention.

If halftone print is printed on a dark, preferably black, the basis in the application of printing inks with fluorescamine pigments and the pigments are chosen so that they are at the proper irradiation glow red, green, and blue, you can get a grayscale image, which in its properties corresponds, in principle, the image obtained with the help of a kinescope, moreover additionally the particular image grayscale images should be chosen so small that they could not allocate more individually. This condition is fulfilled when considering a grayscale image with a normal distance for reading, if the pixels of the image have a diameter of less than 0.3 mm, preferably even less than 0.1 mm If, in addition, the pixels of the image printed so tightly that no longer is viewed dark, preferably black, the base, it is possible to print a grayscale image, with different properties. If we proceed from the fact that they are fluorescent in ultraviolet pigments, which when irradiated normal fluorescent light does not glow in certain light, halftone image when the normal lighting fluorescent light show faded black-and-white image (namely through their own staining fluorescent pigments). If, on the contrary, a grayscale image to irradiate the respective UV light, the pigments flyuorestsiruyut appropriate colour and pigments should be selected with respect to additive color mixing so that they glowed red, green, and blue. Depending on the respective one or another of the individual colors of the image points with the I in a certain place halftone image, and their density is possible by analogy with the tube to generate the corresponding color image, and dark or black base provides the opportunity to get dark parts of the image, as by additive color mixing, you can get the color white, not black.

As already mentioned, you can achieve special effects, if at least one of printing ink to apply the pigments that flyuorestsiruyut not only at one wavelength characteristic of her color, but also can be instituted at a different wavelength, and the fluorescence occurs in a different color. For example, you can apply the pigments, fluorescing under ultraviolet light, namely, on the one hand, at a wavelength of 365 nm, and on the other hand, at a wavelength of 254 nm.

A grayscale image can be obtained by application of the relevant printing inks conventional printing methods, the most appropriate to use offset printing (digital offset printing or hot stamping printing. The advantage of these printing methods is that you can directly apply for each image illustrative information (usually in the form of red, green, and blue sotoodehnia).

Examples for various combinations of pigments in printing inks for getting match is their grayscale images below and are used, for example, the following pigments:

BF11 (red) biofluorescence pigment (red at 254 nm, blue and white at 365 nm)

Manufacturer: Specimen document Security Division, Budapest

SD 120 (red) nanofluorescence pigment (orange-red at 254 nm, red at 365 nm)

Manufacturer: Allied Signal Chemicals Riedel De Haen

CD 130 (orange-yellow) nanofluorescence pigment (orange at 254 nm and 365 nm)

Manufacturer: Allied Signal Chemicals Riedel De Haen

CD 397 (yellow-green): (nanofluorescence pigment (yellow-green at 254 nm and 365 nm)

Manufacturer: Allied Signal Chemicals Riedel De Haen

MF1 (green): nanofluorescence pigment (green at 254 nm and 365 nm)

Manufacturer: Specimen document Security Division, Budapest

MF40 (blue): nanofluorescence pigment (blue at 254 nm and 365 nm)

Manufacturer: Specimen document Security Division, Budapest

MF50 (blue): nanofluorescence pigment (pale blue at 254 nm, no fluorescence at 365 nm)

The manufacturer of the Specimen document Security Division, Budapest

When appropriate pigments were made printing inks for offset printing, with 10-40 weight percent fluorescing under ultraviolet light pigment known manner rubbed with firecom oxidative drying offset printing and immediately used.

If necessary making appropriate thermopile is one of the foil with a coating, containing fluorescent pigments, on a thin substrate of PET (polyethylene of low pressure = Petroten) in a known manner put a layer of varnish, which introduced the necessary fluorescing pigments.

When applying the above-mentioned pigments were obtained following halftone prints.

Example 1

Halftone print in red-green-blue on black, excited at 365 nm

Cd120 (red)

MF1 (green)

MF40 (blue)

With a uniform distribution or intensity of the three pigments used when irradiated with ultraviolet light with a wavelength of 365 nm using additive blending colors are white color. When irradiated with ultraviolet light with a wavelength of 254 nm get faded orange color because the pigment ST 120 at this wavelength's fluorescent not red, and orange.

Example 2

Halftone print in red-green-blue performed at 254 nm

BF11 (red)

CD397 (yellow-green)

MF50 (blue)

With a uniform distribution when irradiated with ultraviolet light with a wavelength of 254 nm due to the additive color mixing is obtained a white color when irradiated with ultraviolet light with a wavelength of 365 nm get green-white color as the pigment BF11 only at a wavelength of 254 nm's fluorescent red, and PR is 365 nm - blue-white. This means, however, that upon irradiation of a grayscale image with ultraviolet light with a wavelength of 254 nm can be obtained in a regular three-color halftone print, while the irradiation of UV light with a wavelength of 365 nm combination according to example 2 is suitable only for black-and-white print.

Example 3

Halftone print in black and white on black, excited at 365 nm

BF11 (blue-white)

CD130 (orange-yellow)

With a uniform distribution and intensity of printing inks containing separate pigments, when irradiated with ultraviolet light with a wavelength of 365 nm are white color, while the irradiation of UV light with a wavelength of 254 nm get red. Halftone prints according to example 3 show itself, so when irradiated with ultraviolet light with a wavelength of 365 nm as black and white prints (since both color pigment expressed in white color), while the irradiation of UV light with a wavelength of 254 nm is observed red image on the black background.

As can be seen from the examples above, the use of additive color mixing using fluorescent pigments according to the invention allows to obtain multiple color effects, the most effective of which is th is effect, associated with the color change upon irradiation with light of different wavelengths, which can be effectively used as easy-to-install sign of protection. Also according to the invention can be produced preferably readable by machine protection elements, which then can clearly be evaluated only with devices that produce special required for excitation of the pigments of electromagnetic radiation, which may considerably differ from the radiation normal daylight.

Example 4

When applying the pigment BF11 (red fluorescence at a wavelength of 254 nm), MF40 (blue fluorescence at a wavelength of 254 nm) receive a grayscale image of the portrait on the substrate, and the distance between the individual points in the image is chosen large enough in the intermediate space can be embedded in other points of the image. The size and the distance between the image points should be selected such that individual pixels cannot be distinguished individually by the naked eye under normal deletion review, about 30 cm

In the intermediate space between fluorescamine points of the image consisting of pigments BF11, MF1 and MF40, printed color point of the image, respectively, of a smaller size, and this is the case we are talking about the dots print in four primary colors for subtractive color mixing (in the General case, blue, yellow, Magenta, and black).

When working with six (or seven with regard to black) colors, you must take certain measures to correct the problems associated with the fact that the print will not appear any layering or will not cause moire. This can be achieved, for example, due to the fact that different images composed of fluorescent pixels in the image, on the one hand, and normal colored dots print, on the other hand, will be imprinted with a variety of screening (for example, rasters, 48 and 60). Another possibility would be to instead of amplitude modulated raster to use raster modulated in frequency, as it is currently common for a large number of digital printing devices.

Point imprint with fluorescein pigment and the point of the fingerprint obtained using normal printing inks, respectively, are arranged with the possibility of obtaining a halftone image, and, for example, you can provide a portrait of the user in both images. The choice of colors for producing a halftone image is correct in the case, if the normal light, such as daylight or artificial light, point, print, causing subtractive color mixing, represent the first halftone color image, the user is the user, while fluorescent point imprint when illuminated by the corresponding light, for example ultraviolet radiation, reproduce, essentially matching the image. Matching of both images is a reliable measure for checking the authenticity of the document.

1. Grayscale image obtained by printing on a substrate, comprising at least two types arranged in a raster of image points of different color and the desired color obtained by mixing colors of pixels in the image, and on the substrate formed of the fluorescent point of the image printing inks containing fluorescent when excited by certain electromagnetic radiation pigments, and not fluorescent point of the image printing inks containing colored, not fluorescent when excited by certain electromagnetic radiation pigments, characterized in that the said fluorescent point of the image and not fluorescent point of the image placed on the substrate in a staggered manner relative to each other.

2. A grayscale image according to claim 1, characterized in that the fluorescent point images forming the first image, and not fluorescent point of the image to form a second image.

3. A grayscale image according to claim 1 or 2, characterized t is m, what fluorescing point of the image consist of three different printing inks, and pigments of different printing inks flyuorestsiruyut respectively in one of the three primary colors, namely, red, green or blue-violet, for additive color mixing.

4. A grayscale image according to claim 1 or 2, characterized in that the pigments are pigments, fluorescamine in ultraviolet radiation.

5. A grayscale image according to claim 3, characterized in that the pigments are pigments, fluorescamine in ultraviolet radiation.

6. A grayscale image according to one of claims 1, 2 or 5, characterized in that the pixels are located on a black background.

7. A grayscale image according to claim 3, characterized in that the pixels are located on a black background.

8. A grayscale image according to claim 4, characterized in that the pixels are located on a black background.

9. A grayscale image according to one of claims 1, 2, 5, 7 or 8, characterized in that at least one of the fluorescent pigments when exposed to radiation of different frequency's fluorescent in different color.

10. A grayscale image according to claim 3, characterized in that at least one of the fluorescent pigments when exposed to radiation of different frequency's fluorescent in different color.

12. A grayscale image according to claim 6, characterized in that at least one of the fluorescent pigments when exposed to radiation of different frequency's fluorescent in different color.

13. A grayscale image according to one of claims 1 to, 2, 5, 7, 8, 10, 11 or 12, characterized in that the dimensions of the image points do not allow to distinguish them from each other with the naked eye.

14. A grayscale image according to claim 3, characterized in that the dimensions of the image points do not allow to distinguish them from each other with the naked eye.

15. A grayscale image according to claim 4, characterized in that the dimensions of the image points do not allow to distinguish them from each other with the naked eye.

16. A grayscale image according to claim 6, characterized in that the dimensions of the image points do not allow to distinguish them from each other with the naked eye.

17. A grayscale image according to claim 9, characterized in that the dimensions of the image points do not allow to distinguish them from each other with the naked eye.

18. A grayscale image according to item 13, wherein the dimensions of the image point is selected smaller than 0.3 mm

19. A grayscale image in one of PP-17, from causesa fact, the size of image points is selected smaller than 0.3 mm

20. The use of a halftone image according to one of claims 1 to, 2, 5, 7, 8, 10, 11, 12 or 14-18 as part of security Affairs, documents, in particular, securities, Bank notes, certificates, or items.

21. The application of claim 20, wherein the halftone image is formed portable to be protected object decorative layer of the hot stamping foil.

22. The application of claim 20, wherein the halftone image is combined with the element providing the optical effect.

23. The application of item 21, wherein the halftone image is combined with the element providing the optical effect.



 

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