RU2271937C1 - Method for creating a concealed image within counter-forgery protective elements of polygraphic products and a template for observing said concealed image - Google Patents

Abstract

FIELD: polygraphic technologies, methods for manufacturing polygraphic elements related to category of elements providing protection of polygraphic production from forgery.

SUBSTANCE: method for creating a concealed image within counter-forgery protective elements of polygraphic products includes, for special protective element consisting of multiple intersecting lines, forming an offset for a portion of bitmap lines utilized to make ornament of aforementioned protective element, for half the step of bitmap line step. For aforementioned special protective element firstly two even bitmap fields are formed, created by means of linear bitmap with similar line positioning and relative area of bitmap elements in first bitmap field 60-70% and in second bitmap field 15-20% and coinciding in size with special protective element with displayed dark portions of ornament on first bitmap field and light portions of ornament on second bitmap field. Onto aforementioned bitmap fields image in form of label and/or drawing is applied, positioned evenly relatively to boundaries of aforementioned fields, which is then cut out, and formed special space is filled with same bitmap with offset for half step of bitmap lines, basic special protective element is repainted for forming of special protective mask, wherein white elements remain white while dark elements become transparent, then special protective mask is positioned on first bitmap field and second bitmap field on special protective mask for producing a model of special protective element with concealed image.

EFFECT: improved level of protection of polygraphic products from forgery, possible direct trustworthiness check due to utilization of individual template.

2 cl, 11 dwg

Description

The invention relates to printing and relates to methods for the manufacture of printing elements that belong to the category of protecting printed products from counterfeiting.

One of the well-known methods of protecting printing products from counterfeiting is the use of guilloche elements, which are continuous interwoven narrow lines that form complex geometric shapes used as a background on a print. Guilloche elements (meshes, borders, rosettes, corners, vignettes) - a pattern of many intersecting thin lines defined by mathematical formulas with values of a dozen digits after the decimal point. By the way, without knowing the exact formula of a particular guilloche, it is almost impossible to reproduce it. It is difficult to reproduce the composition of guilloche elements on the multiplier due to the too small thickness (from 40 to 70 microns) and the constantly changing curvature of the lines.

However, the rapidly growing market of duplicating, copying, scanning and typographic equipment does not allow us to say with confidence about the practical impossibility of repeating a high-resolution drawing or the possibility of imitation close to the original. Therefore, it becomes important to modify the guilloche elements in terms of giving it properties that can be created using modern technology, but cannot be repeated using the same technique.

There is a method of creating a latent image in elements of protection against printing products from counterfeiting, which consists in the fact that in the base guilloche element form the offset of part of the lines of the raster elements, which made the ornament of the guilloche element, by half the step size of the lines of the raster elements (WO No. 95/04665, B 44 F 1/12, publ. 02.16.1995).

This technical solution was made as a prototype for both of the declared objects.

The disadvantage of this method is the low efficiency of protection, which is based on the low level of resolution of copying and duplication equipment, but is quite feasible using serious printing equipment. Another feature of weak protection is that there are no direct means of authenticating such a pattern.

The present invention is directed to solving the technical problem of creating a security element from a multilayer overlay raster fields.

The technical result achieved in this case is to increase the security of printing products from fakes and to enable direct verification of authenticity by using an individual template made with the same parameters as the latent image.

The specified technical result is achieved by the fact that in the method of creating a latent image in the elements for protecting printed products from counterfeiting, which consists in the fact that in the guilloche element an offset of part of the raster lines forming the guilloche element is formed by half the step size of the raster lines for the guilloche element first they form two uniform raster fields formed by a linear raster with the same lineature and the relative area of the raster elements in the first raster field 60-70% and in A second raster field of 15-20% and coinciding in size with the base guilloche element with the display of dark areas of the ornament on the first raster field and light areas of the ornament on the second raster field, place the image in the form of an inscription and / or pattern, which is then cut out, and the resulting inversion is filled with the same raster with a half-step offset of the raster lines, the guilloche element is repainted to form a guilloche mask and, in which the white elements remain white and the dark elements are transparent, then place the guilloche mask on the first raster field and the second raster field on the guilloche mask to obtain a mockup of the guilloche element with a hidden image.

To observe the latent image in the elements for protecting printed products from counterfeiting, a template is used, which is a grid with a linear raster of lineature equal to the lineature of the raster of the latent image with a relative area of raster elements of 40-45%.

These features are significant and interconnected with the formation of a stable set of essential features sufficient to obtain the desired technical result.

The present invention is illustrated by a specific example, which, however, is not the only possible, but clearly demonstrates the possibility of achieving the above set of features of the required technical result.

Figure 1 - base guilloche element;

figure 2 - the first raster field;

figure 3 - the second raster field;

figure 4 - the first raster field with a hidden inscription "SIGN" formed by the displacement of the raster lines;

5 is a second raster field with a hidden inscription "SIGN" formed by the displacement of the raster lines;

6 - the results of combining raster fields and guilloche mask;

Fig.7 demonstration of the visualization of a latent image when applying a template (when moving the template relative to the image, the latent image is read as dark on light);

Fig. 8 is a demonstration of the rendering of a latent image when applying a template (when moving the template relative to the image, the latent image is read as light on dark);

Fig.9 - signs of fraud, the latent image is poorly read;

figure 10 - signs of fraud, strong moire;

11 is a template.

According to the present invention, a method for creating a latent image in elements for protecting printed products from counterfeiting is that in the base guilloche element, an offset of part of the raster lines forming the pattern of the guilloche element is formed by half the pitch of the raster lines.

1. Having a guilloche element (Fig. 1), two uniform raster fields are formed in the graphics editor, formed by a linear raster with the same lineature and the relative area of the raster elements in the first raster field 60-70% (Fig. 2) and in the second raster field 15- 20% (figure 3) and coinciding in size with the base guilloche element with the display of dark areas of the ornament on the first raster field and light sections of the ornament on the second raster field.

2. An image in the form of an inscription, for example, “SIGN” (Figs. 4, 5), and / or a picture, the image of which is then cut out and the resulting inversion is filled with the same raster, but with a half step offset of the raster lines.

3. The guilloche element is repainted to form a guilloche mask, in which the white elements remain white and the dark elements are transparent.

4. Then place the guilloche mask on the first raster field and the second raster field on the guilloche mask (Fig.6). The resulting image is used to create an electronic model of a guilloche element with a hidden image, from which it is possible to produce photo forms (or, with direct output, printed forms).

To observe the latent image in the elements of protection of printing products from counterfeiting, a template is used (Fig. 11), which is a grid with a linear raster of lineature equal to the lineature of the raster of the latent image with a relative area of raster elements of 40-45%. The template is made as well as photoforms. On a photographic typing machine. When combining the template with the printed graphic element, the latent image appears either light against a dark background (Fig. 7), or vice versa (Fig. 8).

When using sufficiently high linear raster lineatures (more than 200 Lpi) and manufacturing photoforms on devices with high resolution (3000-4000 dpi), this method is effective for protection against counterfeiting of printing products on all known types of copying machines, since these devices do not the raster structure of the original will be accurately reproduced and, accordingly, when applying the template, a latent image will not appear. If this copy of protection is reproduced by the printing method, but the line of the raster is different from the original, then when applying the original template, a stronger moire will be observed, and the latent image will be less readable (up to illegibility with a strong difference in lineatures). In Fig.9 - the lineature of the image is less than the lineature of the template by 5%; figure 10 - the lineature of the image is less than the lineature of the template by 10%).

The effectiveness of this method is undeniable, since only a template of the same lineature as the security element is used to observe the latent image, a template is made for each element individually.

Unlike other known methods of manufacturing rasters and guilloche (photo, engraving, etc.), all actions according to the proposed method are performed in a graphical editor on a workstation (personal computer) of the designer of secure printing products.

The present invention is industrially applicable, as it can be implemented using known technologies, which are currently used in the manufacture of guilloche patterns.

Claims (2)

1. The method of creating a latent image in the elements of protection of printed products from counterfeiting, which consists in the fact that for the guilloche element an offset of part of the raster lines forming the pattern of the guilloche element is formed by half the step size of the raster lines, characterized in that the guilloche element is first formed two uniform raster fields formed by a linear raster with the same lineature and relative area of raster elements in the first raster field 60-70% and in the second raster field 15-20% and showing the size of the guilloche element with the display of dark patches of the ornament on the first raster field and light patches of the ornament on the second raster field, the image is placed on the indicated raster fields equally with respect to the borders of these fields in the form of an inscription and / or pattern, which is then cut out and the resulting the inversion is filled with the same raster with a half-step offset of the raster lines, repainting the base guilloche element to form a guilloche mask, in which the white elements are about Melt white and dark elements - transparent, then a guilloche mask on the first and second field raster bitmap field on guilloche mask for the layout guilloche element with latent image. 2. The template used in the method according to claim 1, for observing a latent image in elements of protection of printed products from counterfeiting, which is a grid with a linear raster of linearity equal to the lineature of the raster of the latent image with a relative area of raster elements of 40-45%.

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