RU2773926C2 - Set consisting of complex transparent device and at least one micro-image matrix, as well as protected document containing specified set - Google Patents

Abstract

FIELD: information protection.

SUBSTANCE: group of inventions relates to a set of protective devices (E) and a protected document containing such a set, while the set of protective devices consists of a multicomponent transparent device, which is a refractive and/or diffraction device affecting a phase of light radiation, and at least one micro-image matrix. At the same time, the specified multicomponent transparent device consists of a periodic two-dimensional matrix (RPU) formed from separate sections (PU), each section (PU) includes micro-optical device (1), wherein at least part of these micro-optical devices (1) has uncentered optical axis (10), and at least part of these micro-optical devices (1) is located non-periodically, that is, with different displacements of their optical axes in the specified matrix (RPU). Specified micro-image matrix (2) consists of such a number of micro-images, which corresponds to how many micro-optical devices (1) are available. Each micro-image (2) has a contour identical to a contour of corresponding section (PU), and an upper or lower surface identical to a surface of corresponding section (PU). Each micro-image (2) is subdivided into at least one miniature image (20), so that, when the specified transparent device is located opposite specified micro-image matrix (2) and an observer views the specified matrix through the specified transparent device, he/she sees, at least in the specified direction of observation, an image (S) reproduced by a combination of miniature images associated with this direction. In this case, in the same subdivision, some miniature images (20), that is, only a part of them, which makes up the first group, are distributed in such a way that, when the specified transparent device is placed opposite specified micro-image matrix (2), these miniature images (20) are located on the optical axis of corresponding micro-optical device (1).

EFFECT: obtaining a set of protective devices for a document.

18 cl, 20 dwg

Description

The field of technology to which the invention belongs

The present invention relates to a set consisting, on the one hand, of a complex transparent device, i.e. a refractive and/or diffractive device affecting the phase of the light, and, on the other hand, from at least one microimage array.

It also refers to a security document, such as a bank note, which includes such a set.

State of the art

In the field of security documents, and more specifically fiduciary documents such as banknotes, there are various technologies for encoding information using optical means.

One of the oldest technologies is the holographic type technology. Holograms are still used on smart cards, as described, for example, in document WO9740464.

Similarly, moiré effect devices are now widely used. In this regard, you can refer to the document EP2811470. They are based on the relationship between a phase array (such as micro-optical devices) and a microimage array with different pitches.

In addition, technologies related to the principle of autostereoscopy that support some reading angles are also very well developed, as shown in US2014/177008.

Of course, various combinations of the various effects mentioned above have been proposed, in particular in WO2016/183635.

Other secondary technologies have also been proposed or generally enhance existing protection (see e.g. WO2015/113718) other secondary technologies that implement more complex effects, such as those using polarization (see e.g. WO2016/141420) or resonant modes (for example, with the "plasmon effect").

Finally, document WO 2017/184581 describes a module according to the preamble of claim 1 of the present application.

All of these technologies, when applied to secure documents such as fiduciary documents, aim to make unauthorized copying particularly difficult, in other words, to make it harder for counterfeiters.

The present invention, which is based on a multiscope type technology, aims to provide a new version that is even more difficult to reproduce and that includes particularly effective means for verifying the authenticity of the corresponding document.

The essence of the invention

Thus, the present invention relates to a set consisting, on the one hand, of a multi-component transparent device, i.e. a refractive and/or diffractive device influencing the phase of the light emission, and, on the other hand, at least one microimage array, in which:

- said multi-component transparent device consists of a periodic two-dimensional array formed from individual "pupils", in which each pupil includes a micro-optical device, and at least a part of these micro-optical devices has a non-centered optical axis, and at least a part of these micro-optical devices is located non-periodically, that is, with a different shift of their optical axis in said matrix;

- said matrix of microimages consists of as many microimages as there are microoptical devices;

- each microimage has a contour identical to the contour of the corresponding pupil, and a surface that is maximally identical to the surface of the corresponding pupil;

- each microimage is subdivided into at least one thumbnail image,

in such a way that when said transparent device is placed opposite said microimage array, and when an observer observes said array through said transparent device, he sees, at least in a given viewing direction, an image reproduced by a combination of thumbnail images associated with that direction,

characterized in that in the same subdivision, some miniature images, i.e. only a part of them constituting the "first group", are distributed in such a way that when said transparent device is located opposite said microimage array, these miniature images are located on the optical axis of the corresponding micro optical device.

In addition, in accordance with other non-limiting and preferred characteristics of the invention:

- each of said micro-optical devices has a non-centered optical axis, and all said micro-optical devices are located non-periodically;

- mentioned pupils have the same shape and surface;

- mentioned micro-optical devices having non-centered optical axis are Fresnel lenses;

- mentioned micro-optical devices having non-centered optical axis are round concentrating diffraction gratings;

- each microimage is subdivided into at least two thumbnail images,

- in the same subdivision, the other thumbnails that make up the second group are distributed in such a way that when said transparent device is placed opposite to said microimage array, these thumbnails are on an optical axis different from that of said respective micro-optical device;

- the image reproduced by the combination of thumbnail images of each unit, when viewed from at least one predetermined viewing angle, is recognizable information or gives a recognizable visual effect;

said multi-component transparent device and said microimage array are supported by the same carrier;

said multi-component transparent device and said microimage array are supported by different media; and

said two-dimensional microimage array is generated by a display device such as a screen of a digital device, mobile or non-mobile.

The invention also relates to a security document, such as a banknote, on one of the opposite sides of which there is a multi-component transparent device of a set in accordance with any of the previous characteristics.

Preferably:

said multi-component transparent device extends over a printed image located on one of said opposite sides, this printed image being a two-dimensional array of microimages of said set in accordance with any of the preceding characteristics;

- said multi-component transparent device passes through a window which is open on said opposite sides and which includes a printed image constituting a two-dimensional microimage matrix of said set in accordance with any of the preceding characteristics, and this window and this printed image are located relative to each other so, so that they can be superimposed on each other, at least for a short time;

- said printed image consists of at least one printing ink selected from the group consisting of the following printing inks: visible black ink, color ink, matte ink, glossy ink, iridescent effect ink, metallic ink, optically variable ink, invisible ink , but visible under ultraviolet light (fluorescent or phosphorescent) or visible under infrared light.

said transparent device is coated with a layer of transparent lacquer so that the upper surface of said device is flat.

Brief description of the drawings

Other characteristics and advantages of the invention will become apparent upon reading the following description of the preferred embodiment of the invention. This description is given with reference to the accompanying drawings, in which:

- in Fig. 1 is a diagram showing the principle of multiscoping;

- in Fig. 2 and 3 are diagrams showing cases of autostereoscopy;

- in Fig. 4 is a diagram illustrating how various images are recreated from microimages that extend under the lens array;

- in Fig. 5 is a diagram showing the equivalence between a combination of a refractive lens and a prism on one side and a Fresnel lens whose optical axis is off-center on the other side;

- in Fig. 6A-6D are diagrams designed to show the symmetry of the mechanisms involved, namely, offset from the center of the optical axis of the lenses and adjustment of the location of the thumbnail (image area);

- in Fig. 7A-7C show a separate embodiment of a kit in accordance with the invention;

- in Fig. 8 and 9 are top views of two alternative versions of the microlens array portion;

- in Fig. 10 is a diagram showing a banknote, viewed from above, on one of the faces of which a set in accordance with the present invention has been applied;

- in Fig. 11A is a very schematic sectional view of the module shown in the previous figure;

- in Fig. 11B and 11C are views similar to those of FIGS. 11A alternatives;

- in Fig. 12 is a view similar to FIG. 10, the banknote having a transparent window containing only one lens array of said module, this figure also showing a telephone on the screen of which a microimage array can be displayed;

- finally, in Fig. 13 shows a banknote which includes in the first area a transparent window containing only one lens array of said set, and in the second area a printed image of the microimage array.

Detailed description of the invention

In accordance with the present invention, a set is formed consisting of two main elements, namely, a complex transparent device that can be seen on a security document such as a banknote, operates in transmitted light and consists of micro-optical devices, and a carrier, against which, through simple alignment is located this complex transparent device.

Preferably, this carrier, at the site of application of a complex transparent device, contains patterns that cannot be read by the naked eye, which can be applied directly to the substrate of the carrier (made of paper and / or polymer), or can be visible, for example , on a smartphone screen or touch pad and be readable in reflected or transmitted light.

Alternatively, part of the patterns may be on the substrate of the carrier, and the other part may be on the mobile device, described above. When these two elements are combined properly, they allow:

• generate different images for a certain number of given viewing positions (in the near field of view, ie about 40 cm) to create the illusion of relief or movement; or

combine images into stereoscopic vision so that color can be perceived through a colorimetric combination; or

form a second image at the exact point of observation, so that this second image is somehow hidden in the main image.

Therefore, decryption is carried out due to the combination of two planes: the plane of the microimage matrix and the plane of the matrix of microoptical devices, which are themselves encrypted or encoded separately, that is, the arrangement of the smallest constituent elements - microimages, respectively microoptical devices - does not obey any rule of symmetry or replication (parallel transfer), which is immediately easy to recognize by simple observation with the naked eye or the armed eye (using a magnifying glass, microscope).

Alternatively, the combination of the two planes can be fixed and made once and for all either directly on the carrier substrate, or indirectly by another pointer that is directly attached to the carrier substrate or integrated into the carrier substrate (for example, by means of transferred elements, or hot rolled elements , or cold rolled elements, partially embedded mesh, etc.).

Coding principle and state of the art specific to the present invention:

The kit system according to the invention consists of a combination of coding (encryption) and a multi-component transparent device. By "multi-component transparent device" is meant any refractive, diffractive or combined device that affects the phase of light emission (eg diffraction gratings, lenses, prisms, etc.).

Each media image consists of "thumbnail images" corresponding to sub-elements of the microimage matrix (ultimately, the smallest thumbnail image is the pixel of the image itself).

The principle of multiscopy is that, depending on the inclination and orientation of the gaze, different images are visible.

The best known is the use of parallax barriers or lenticular arrays. The present invention is based on these ideas, generalizing them.

Indeed, the set according to the invention consists of a two-dimensional refractive grating behind which is placed a microimage array, each miniature image can be shifted relative to the optical axis of the lens directly opposite it, in order to form independent images.

Many solutions of this type have already been proposed in the past. For example, according to document US2014/177008, by tilting the device, one can see a moving image, the movement of objects that move relative to each other, or the effects of relief, shapes, appearance/disappearance, zoom. To do this, parts of the images (each of which corresponds to a certain viewing angle) are placed in a very specific way under each lens.

Similarly, WO2015011493 uses a different image for each viewing angle (the difference is that the areas of the images placed under the center of the lenses are larger than the areas located on the sides, since the range of angles perceived at the center of the lenses is larger).

Definitions:

In this application, the following terms and expressions have the definitions given below:

Micro-optical device: It is formed by a device whose size can vary from 25 to 100 microns. Its focal length may vary from 10 to 400 µm and preferably from 40 to 100 µm.

Microimage Array: It is formed from miniature images larger than 2 µm, which are optically enlarged using micro-optical devices. This, accordingly, makes it possible to form a large image.

Image: An image is what is perceived by an observer when viewed through an array of micro-optical devices. Its size corresponds to the size of said matrix, i.e. from a few square millimeters to several square centimeters. It is formed from a set of miniature images (in other words, parts of an image).

Thumbnail or part of an image: The thumbnail is the smallest sub-element of the microimage matrix and the thumbnails will make up the image. The size of the thumbnail image is less than or equal to the size of the micro-optical device. This allows you to have multiple possible thumbnail images for a given device. Thus, the thumbnail image selected by the micro-optical device will differ depending on the viewing angle, resulting in different images. Between two successive images, the viewing angle can change by several degrees.

Principles underlying the present invention:

The first realized principle is based on three separate elements.

The first element concerns the nature of the refractive grating located above the microimage array. Inspired by the multiscope principle, it is proposed here to combine an imaging function (lens or axicon) with a prism-type deflection function, individually and independently for each array element. Under these conditions, the refractive grating predominantly consists of a micro-optical device including an imaging element (lens or axicon) coupled to a prism (the angle and orientation of which is fixed).

The second element is based on the microimage array design. The latter are located and designed in such a way that placing them opposite the optical element creates different images at certain gaze positions.

The third element concerns the phase alignment of micro-optical devices. Indeed, this phase matching makes it possible to combine the imaging function with the prism function by converting it into a function of parallel translation of the axis of the imaged object with respect to the optics. This alignment simplifies the fabrication of the optics and the implementation of the second element.

The second principle, i.e. the fact that the array of micro-optical devices is not necessarily periodic makes it difficult to copy the array unless it is coated with a compensation layer, such as varnish, designed to make the surface of the array inaccessible. If this compensation layer is absent, then, thanks to the invention, the location of the smallest constituent units of the matrix cannot indeed be determined by simple observation.

In addition to applying the principle of alignment of the respective optics, the imaging optics bias (which is made possible by said alignment) and the corresponding thumbnail images are encoded, possibly jointly, in a random manner in order to avoid easy decryption and therefore to be reproduced only with a hypothetical true copy that cannot be obtained from simple observation.

A device that allows the reproduction of different images at a certain number of gaze positions leads to the fact that the configuration of micro-optical devices and the corresponding miniature images is, therefore, arbitrarily cross-linked, which involves recalculating the deviations resulting from this cross-linking in order to preserve the conditions for forming the original Images.

The result is a distribution of micro-optics shifts that is no longer uniform and therefore much more difficult to derive and/or reproduce.

In practice, this cross-coupling is performed with a limiting condition on the maximum deviation, which is limited by manufacturing conditions when calculating the phase mask. For example, in the case of a Fresnel lens of order p, the limit is reached when the phase shift between 2 successive mask edge pixels (ie the largest spatial frequency) is greater than pπ. Beyond its aisles, it becomes a subsample.

In FIG. 1 shows the principle of multiscoping. Thus, an LC converging lens is used here, so that different images can be seen from different viewing angles. For the viewing angle AV1, only part of the image PI1 is visible because the converging lens concentrates the rays. On the other hand, for viewing angle AV2, only part of the image PI2 will be visible. Thus, interleaving of different images is possible.

In FIG. Figures 2 and 3 show cases where autostereoscopy is used. Thus, with reference to FIG. 2, a lenticular array RL is used which, as explained above, allows certain viewing angles AV1 and AV2 to be favored so that the thumbnail image portion IG will be visible to each eye. Under these conditions, it will look like a relief image. Likewise, with reference to FIG. 3, BP parallax barriers can be used that block part of the rays so that each eye can see a different IG thumbnail image.

In FIG. 4 shows an array of microimages MI1 to MI4 in the center. Each lens of the lens array RL is bounded by a square, under which are four microimages arranged in such a way that they give a large image GI1-GI4 for four given viewing angles AV1-AV4.

With reference to FIG. 5, there is an equivalence between the combination of a refractive lens LC (optical power) and a prism P (light deflection) on the one hand, and a decentered Fresnel lens LF on the other hand. The latter gives the same effect, namely the concentration and deflection of light. The advantage is that said deviation leads to a shift.

Although not shown in the accompanying figures, the prism-coupled axicon is also equivalent to a decentered circular concentrating diffraction grating ("axicon phase hologram").

In FIG. 6A-6D show: the effect of shifting the optical axis of the lens relative to the center of the lens, and adapting the miniature image (or part of the image) so that the latter is or is not visible through the lens, depending on the desired viewing angle. In the case shown in FIG. 6A, the image portion PI is perceived for the viewing angle AV1 when the lens is centered.

However, if the lens is shifted from the center to the right, then the image part PI is visible for the viewing angle AV2 (the case in FIG. 6B), which is equivalent to moving the image part PI to the left in the case of a centered lens, as shown in FIG. 6C. For equivalence to the case in FIG. 6A with a decentered lens, it is also necessary to move the PI portion of the image as shown in FIG. 6d.

It can be seen that these functionalities can be combined (ie, interleaved) to make it more difficult to extract the constituent parameters of the arrangement in question.

In FIG. 7A-7C show a specific embodiment of a kit in accordance with the present invention.

Thus, in FIG. 7A shows a multi-component transparent device that consists of a two-dimensional periodic array RPU formed from individual "pupils" of PUs, that is, in this case, square areas, where each pupil of the PU includes a micro-optical device. For reasons of legibility of the figure, the outline of each pupil of the PU is shown in this case, but it is not actually visible.

In addition, for reasons of ease of reading, this figure shows only the optical center 10 of lenses 1 placed on this matrix. It can be seen that these lenses have different offsets from their optical center in the matrix.

In FIG. 7B, the aforementioned RPU array is still visible, but only microimages 2 are now presented, with several thumbnail images 20 represented as a black square. These thumbnails are only a part of the entire collection of thumbnails and constitute the "first group". It should be noted that their distribution is also not periodic. However, the position of some of them coincides with the position of the optical centers indicated in Fig. 7A.

In FIG. 7C shows the "final situation", that is, one in which the two matrices are aligned.

A generally "O"-shaped symbol, shown in gray in the figure, appears in the observer's field of view, provided that the direction of view is perpendicular to the plane of the matrices. This "O" symbol is an image reproduced by the combination of the thumbnail images 20 shown in FIG. 7B.

And for non-character pixels, the thumbnails are far from the center of the lenses.

If the lens array in FIG. 7A or the thumbnail array in FIG. 7B taken separately, this does not provide information, since their distributions seem to be random and unrelated. Only their combination shows the information formed by the above symbol.

Although not shown here, the second symbol (or even additional symbols) may be disclosed, provided that all of its corresponding thumbnails are visible along the other viewing axis.

Thus, these thumbnail images (other than those of the "first group" mentioned above) constitute the "second group" of thumbnail images.

Thus, the observer will see the presence of the aforementioned letter "O" if the direction of his gaze is perpendicular to the plane of the matrices. Then, by directing his gaze in a different direction (or changing the orientation of the kit), he will see the second character.

Finally, for all other directions, no character will be visible.

In FIG. 8 and 9 show two microlens arrays 1 that were generated independently and randomly. For each microlens, the microimages below were adjusted accordingly. Despite the difference between the two sensors, it is possible to create a combination of lens arrangements and thumbnails in such a way that the same visual effect (for example, a growing square) is obtained.

It has been observed that the non-uniform distribution of lenses prevents reproduction except by copying a specific structure, which structure can be changed indefinitely.

Adding a hidden symbol to the matrices makes it possible to determine that the completed pattern is not a fake of the original.

This symbol may represent, for example, a second image viewed only at a given angle (and therefore hidden from all other viewing angles), or even an observed pattern in reflected light on the surface of the lenses and associated with their configuration.

For example, it may be a finite set of lenses, the optical axis of which is shifted in an orderly manner in a non-periodic matrix to form characters or patterns. Viewing these lenses at a given angle (large enough not to see thumbnail images) would allow characters or patterns to be recognized.

Preferably, kit E according to the present invention is applied to a security document such as a bank note.

Such a banknote 3 is shown very schematically in FIG. 10. On one of its opposite sides, the mentioned set E is applied.

As shown more specifically in the embodiment of the invention in FIG. 11, set E in this case consists of a lens array 1 and a microimage array 2 applied to the side 30 of the banknote.

Set E in this case can be made in two stages, not necessarily sequential, directly on the banknote substrate 3.

Set E can also be an insert that is attached to the banknote 3 after an application step (eg as a hot or cold transfer film, hot rolled or cold rolled film, etc.) or an integration step, as shown in FIG. 11B, which shows in section the guard wire carrying set E, with the wire inserted into the mass of the substrate, but with windows to allow it to be seen with the naked eye on the surface in some places).

Finally, set E can pass through the substrate (as shown in Fig. 11C) constituting banknote 3 (if it consists, for example, of a transparent polymer made opaque in some places, except where the matrix 1 is located).

As regards the microimage matrix 2, it consists of a recognizable result of any technology that allows information to be composed, for example, in the form of images, shapes, patterns and without limitation by printing, metal deposition/demetalization, laser engraving.

To leave only the printing technology, it is carried out in accordance with any known method that allows the application of at least one printing ink selected from the group consisting of the following printing inks: visible black ink, color ink, matte ink, glossy ink, ink with iridescent effect, metallic paint, optically variable paint, invisible paint, but visible under ultraviolet light (fluorescent or phosphorescent) or visible under infrared light.

In addition, the lens array 1 extends over the printed image permanently or briefly.

This lens array, for example, can be etched in a first step in a photosensitive resin such as S1813 resin (supplied by Shipley) by photolithography.

You can do the following to create it.

The resin layer is applied to a glass substrate. The resin plate is then exposed to an ultraviolet laser beam which is modulated with a mask corresponding to the phase mask to be engraved. After that, the areas of the mask that were exposed are removed (in the case of a "positive" resin, otherwise the areas not exposed to radiation are removed). This is how a relief is engraved on the plate, and the maximum engraving depth increases with increasing exposure time.

This is followed by a replication process to obtain tools and then the final finished product, i.e. the lens array 1 either directly on the banknote 3 or in a form that can be integrated into it (attached insert after application or integration) or even in a form using the transparency of the constituent substrate (the case of the above-mentioned banknote made from a polymer substrate).

Finally, there is also a variant in which this lens array 1 is removable and not attached to the banknote 3, and the array 2 is permanently on the banknote only in this case.

Preferably, the non-planar top surface of the lens array is coated with a clear lacquer to make it flat and avoid any attempt at fraudulent reproduction by direct imprinting.

After manufacturing, the matrix is applied to the printed image indicated above.

In an embodiment of the invention, in FIG. 12, banknote 3 includes a window 4. This window is affixed to the rest of the banknote in the case of a transparent substrate (for example, banknotes based on bi-oriented polypropylene). If the substrate is opaque (for example, a banknote based on cotton fiber), then the window is a hole filled with a transparent polymer material, the latter containing a lens matrix 1.

As for the microimage array, it can be displayed on the screen 50 of the smartphone 5 or on the digital display screen of the digital instrument, whether it is mobile or not.

Thus, by opposing said window and the matrix displayed on the screen, the banknote can be authenticated depending on whether the recognizable information is visible or not, or whether the recognizable visual effect is highlighted or not.

In the embodiment of the invention shown in FIG. 13, the matrices 1 and 2 are located in two different areas of the banknote 3, so that when the banknote is folded as indicated by the arrow f, the two matrices can be superimposed to detect recognizable information or a visual effect.

In one embodiment of the invention, not shown, a note such as that shown in FIG. 12, in which the window, in addition to the lens array, contains only a part (for example, half) of the microimage array, while the complementary part is displayed on a phone screen, or the like.

Finally, in a final embodiment of the invention, which is not shown, only the microimage array 2 may be applied to the banknote 3, and the lens array 1 will be made on a removable medium and added only temporarily for authentication purposes.

Claims (24)

1. A set (E) of protective devices, consisting of a multi-component transparent device, which is a refractive and/or diffractive device that affects the phase of light emission, and at least one microimage array, while - said multi-component transparent device consists of a periodic two-dimensional array (RPU) formed from separate sections (PU), each section (PU) includes a micro-optical device (1), and at least some of these micro-optical devices (1) have non-centered optical axis (10), and at least a part of these micro-optical devices (1) are located non-periodically, that is, with different offsets of their optical axes in the specified matrix (RPU); - said matrix (2) of microimages consists of as many microimages as there are microoptical devices (1); - each microimage (2) has a contour identical to the contour of the corresponding area (PU), and an upper or lower surface identical to the surface of the corresponding area (PU); - each microimage (2) is subdivided into at least one miniature image (20), such that when said transparent device is placed opposite said array (2) of microimages and the observer views said matrix through said transparent device, he sees, at least in the given viewing direction, an image (S) reproduced by a combination of thumbnail images associated with this direction, characterized in that in the same subdivision, some miniature images (20) - i.e. only a part of them which constitutes the first group - are distributed in such a way that when said transparent device is placed opposite said matrix (2) of microimages, these miniature images (20) are located on the optical axis of the corresponding micro-optical device (1). 2. Set according to claim 1, characterized in that each of the micro-optical devices (1) has a non-centered optical axis (10) and all micro-optical devices are located non-periodically. 3. A set according to claim 1 or 2, characterized in that said areas (PU) have the same shape and surface. 4. Kit according to any one of paragraphs. 1-3, characterized in that the micro-optical devices (1) having a non-centered optical axis are Fresnel lenses. 5. Kit according to any one of paragraphs. 1-3, characterized in that the micro-optical devices (1), having a non-centered optical axis, are round concentrating diffraction gratings. 6. Kit according to any one of the preceding claims, characterized in that each microimage (2) is subdivided into at least two miniature images (20). 7. A set according to any one of the preceding claims, characterized in that, in the same subdivision, the other miniature images that make up the second group are distributed in such a way that when said transparent device is located opposite said matrix (2) of microimages, these miniature images the images are on the same axis, different from the optical axis of the corresponding micro-optical device. 8. A set according to any one of the preceding claims, characterized in that the image reproduced by the combination of miniature images (20) of each subdivision, when observed in at least the indicated predetermined viewing direction, is recognizable information (S) or gives a recognizable visual effect. 9. A kit according to any one of the preceding claims, characterized in that said multi-component transparent device and said microimage array (2) are supported by the same carrier. 10. Kit according to any one of paragraphs. 1-8, characterized in that said multi-component transparent device and said matrix (2) of microimages are supported by different media. 11. The kit according to claim 8, characterized in that said two-dimensional microimage array is created by a display device that is mobile or non-mobile. 12. The kit according to claim 11, in which the display device is a screen (5) of a digital device. 13. Security document, characterized in that it contains a set of security devices according to any one of paragraphs. 1-9, wherein the multi-component transparent device contained in said set of security devices is located on one of the opposite sides (30) of the security document. 14. A security document according to claim 13, characterized in that it is a banknote. 15. A security document according to claim 13 or 14, characterized in that said multi-component transparent device extends over a printed image located on one of said opposite sides (30), while the printed image is a two-dimensional matrix (2) of microimages contained in specified set of protective devices. 16. A security document according to claim 13 or 14, characterized in that said multi-component transparent device passes through a window (4) that is open on said opposite sides, and the document includes a printed image, which is a two-dimensional matrix (2) of microimages contained in the specified set of protective devices, and the window (4) and the printed image are located relative to each other in such a way that they can be superimposed on each other. 17. Security document according to any one of paragraphs. 13-16, characterized in that said printed image consists of at least one printing ink selected from the group consisting of the following printing inks: visible black ink, color ink, matte ink, glossy ink, iridescent effect ink, metallic ink , an optically variable paint, invisible paint, but visible under ultraviolet light - fluorescent or phosphorescent - or visible under infrared light. 18. Security document according to any one of paragraphs. 13-17, characterized in that the specified multi-component transparent device is covered with a layer of transparent varnish, so that the upper surface of the specified device is flat.

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