FR2945370A1 - METHOD OF MAKING A MULTIPLE IMAGE ON THE UPPER FACE OF A LINEAR RELIEF SUPPORT AND THE SUPPORT THUS OBTAINED - Google Patents

Abstract

The method consists of printing, preferably by ink jet, directly on each side (9, 10) of the linear reliefs (7) repetitive of a support (1) a strip (12, 13) of one of the images simple components of the multiple image (2) to be printed. The support (1) is preferably of the corrugated cardboard type. It has linear repetitive reliefs (7), juxtaposed, with at least two flanks on which is printed a succession of strips alternately belonging to each of the single images constituting the multiple image, the strips belonging to each of the single images being printed solely on the same flank of each of these linear reliefs, so as to see only one of the simple images under a certain angle of observation and another of these simple images from another angle. Application to advertising material and posters.

Description

The present invention relates to a linear relief support, non-transparent on which is printed a multiple image composed of at least two different simple images that can be viewed successively by changing the angle of observation or by moving the support. The invention also relates to a method for producing such a multiple image support.

A multiple image, also called a dynamic image, is a composite image formed of several different simple images by an appropriate image processing, which appears different depending on the angle of incidence with which it is viewed. It makes it possible to observe successively and in isolation each of the simple images that compose it when one changes the angle of observation. Multiple images thus make it possible, for example, to give a moving and dynamic character to an image, to create an animated scene or to display a message or new elements on a given image, whereas they are simply printed on a passive medium at a given image. two dimensions. Such images attract the eye with their originality and their playful and attractive character. They are particularly appreciated in the field of advertising and communication where they offer great creative possibilities. However, the current supports of these dynamic images have many drawbacks that greatly limit their use. To obtain such dynamic images, the current technique consists in producing so-called lenticular supports. These supports are conventionally formed of the superposition of a printed base sheet and a thick transparent resin top plate whose outer face is shaped in a succession of juxtaposed curved linear shapes acting as a multitude of juxtaposed linear lenses. The base sheet is a flat sheet of adhesive paper on which at least two interlaced single images are printed. The base sheet is glued under the transparent top plate made of resin. It is observed through it by means of the linear lenses shaped on the surface, which allow by optical effect to successively see the different single images composing the multiple image during a visual scan modifying the angle of observation. The upper plate of these known lenticular supports is made from synthetic raw materials which are already relatively expensive in the raw state. In addition, to obtain a satisfactory image rendering, the upper plate must have very thin linear lenses on its upper face, which requires very precise conformation techniques that generate high manufacturing costs. The finished product is therefore found in commerce at a high selling price which limits its application to high-end products. Advertising and communication professionals, although very interested in these multi-image media, can not therefore use them on a large scale to produce temporary and / or large-format products, such as posters or advertising displays. for example, because the cost would be prohibitive and commercially difficult to justify.

In addition, this type of support is rigid and can not be folded without being damaged, which generates significant difficulties for transport,

handling and storage of large format media, for example imposing transport conditions similar to those used for glass plates.

In addition, because of the use of a resin plate, these lenticular supports are difficult to recycle and must be reprocessed at the end of life. Thus, the high cost and the difficulties of transporting and reprocessing the current conventional so-called lenticular media limit their use to a few small applications. The present invention aims to overcome the main drawbacks of the media of the state of the art by providing a new multi-image support particularly inexpensive, easily recyclable and can be rolled or folded without damage to facilitate storage or transport. It can thus be made in large format at low cost, for example for the production of posters or advertising displays, which perfectly meets the expectations of professionals in the field. For this, the invention teaches a new method of printing a multiple image directly on the upper face of a cheap material, for example corrugated cardboard preferably single-sided micro-grooves existing in the field of packaging , or any equivalent material having corrugations, splines or other linear shapes with at least two flanks or facets, arranged side by side in a repetitive manner. More particularly, the invention relates to the method of forming a multiple image and printing directly on the upper face of the interlaced strip support alternatively from at least two single images composing the multiple image, cut into strips according to the step of repetition of the linear forms of the upper face of the support, the bands of each of the single images being printed only on one of the flanks or facets of these linear shapes, so as to obtain a global vision of one of the images simple components of the multiple image at a certain viewing angle and another single images composing the multiple image at a different viewing angle. The invention thus provides a support which has a multiple image composed of at least two different simple images that can be seen successively and in isolation by changing the observation angle of the support. According to the invention, this support comprises on its upper face linear reliefs with at least two flanks or facets, arranged side by side in a repetitive manner.

The multiple image, formed of a succession of intertwined strips belonging alternately to each of the single images that compose it, is on the upper face of the support at its linear reliefs and is preferably printed there.

All the bands belonging to the same single image composing the multiple image are on the same flank or facet of the linear reliefs. The invention also provides a method of producing such a support comprising the following steps: dividing each single image composing the multiple image into bands of width corresponding to that of the flank or the facet of the linear reliefs of the support on which they must be located; . composition of a global image interlaced by juxtaposition of the bands coming from the simple images, these strips being interspersed

alternately according to the alternation of the flanks or facets of the linear reliefs of the support on which they must be; . reproduction of the overall image interlaced on the upper face of the support by calibrating laterally so that each band is found on the flank or the corresponding facet (e) linear reliefs of the support. Other features and advantages of the invention will appear in the description which follows, given by way of example and accompanied by the drawings in which: Figure 1 is a top view in perspective of a support according to the invention with rounded linear reliefs, on which is printed a multiple image composed of two single images; . FIG. 2 represents in perspective the support of FIG. 1 seen from the right, according to an angle of observation allowing only the vision of the first single image; . FIG. 3 represents in perspective the support of FIG. 1 viewed from the left, according to an angle of observation allowing only the vision of the second simple image; . Figure 4 is a schematic cross-sectional view of the support of Figure 1, made in the area where the multiple image is printed; . Figures 5 to 9 are cross-sectional views of different support variants that can be used to implement the invention; . Figure 10 is a schematic cross-sectional view of another support according to the invention with trapezoidal linear reliefs, on which is printed a multiple image consisting of three single images. For a better understanding of the reader, there is shown in Figures 1 to 4 a first example of a support 1 according to the invention on which is printed a multiple image 2 composed of two single images 3 and 4, the first 3 representing a black apple and the second 4 a white apple.

The support 1 is made here of single-face corrugated cardboard, that is to say with corrugations or visible fluting on one of its faces. It conventionally comprises a corrugated top sheet under which is secured, preferably by gluing, a flat base sheet 6 for stiffening the assembly and to keep constant the pitch of the corrugations of the topsheet 5. The corrugations of the topsheet 5 form linear reliefs 7, in the case shown grooves 8 rounded section, juxtaposed following each other. Each of these grooves 8 has two sides or slopes, called left flanks 9 and right sides respectively 10. According to the invention, the multiple image 2 is on the upper face 11 of the support 1 and therefore on the upper face of the grooves 8 The multiple image 2 is composed of interlaced strips 12 and 13, that is to say belonging alternately and respectively to the two single images 3 and 4. The alternating pitch of the strips 12 and 13 corresponds to that of the corrugations of the cardboard. In the example shown, the strips 12 belonging to the first image 3 are arranged only on the left flanks 9 of the flutes and the strips 13 belonging to the second image 4 only on the right flanks 10 of the flutes 8. Thus, as shown in FIG. 2, when looking at the support 1 at an angle of observation grazing from the left, symbolized by the arrow 14, we see only the first image 3 of the multiple image 2. And, when one look at the support under a viewing angle grazing from the right, symbolized by the arrow 15, we see only the second image 4, as shown in Figure 3. The linear reliefs 7 of the support 1 may be different from the grooves 8 to rounded section of this first embodiment. Figures 5 to 8 give several non-limiting examples of other usable forms. It can thus be linear reliefs with rounded section 8 (Figure 5), triangular section 16 (Figure 6), rounded section with flattened top 17 (Figure 7) and trapezoidal section 18 (Figure 8). In addition, it is also conceivable to use a support 1 composed of a single upper sheet 5 and not comprising a base sheet 6 as shown in FIG. 9. In this case, the top sheet 5 must be sufficiently rigid to keep the geometry of its linear reliefs 7 and to keep the pitch of its reliefs constant 7.

In order to produce the support 1 according to the invention, it is particularly advantageous to use a commercially available inexpensive material and preferably single-face corrugated cardboard. However, it is also conceivable to manufacture a specific support for this use. In the particular case of single-sided corrugated cardboard with micro-grooves, the linear reliefs 7 are low-pitched corrugations each having a rising curved flank and a convex flank descending on each of which, it is intended to print a strip of image . Of course, one can flatten the edges slightly for example by a suitable mechanical process to create an additional printing surface and proceed to the printing of three images and so on up to a mechanical and optical limit. Of course, the invention is not limited to a support having a corrugated relief, or even a cardboard support. On the contrary, it extends to all forms in succession of linear reliefs presenting several flanks, flat, curved or faceted.

Similarly, the ridge or the upper linear curved may be less bulging, flattened or shaped table or plateau. In addition to their shape, the supports can also vary widely in their nature and physical and technical characteristics. Thus, the support can be in different materials: synthetic, plastic, composite ..., or in different materials: paper, cardboard, wood, cardboard or plasticized paper ...

The quality and physical properties of the media can also change. It may be more or less absorbent, more or less transparent, more or less dense, more or less rigid. When the linear reliefs 7 of the support have more than two flanks or facets, it is possible to produce multiple images 2 composed of more than two single images. An example is shown in Figure 10. It is a support 1 which has linear reliefs 7 trapezoidal section 18, on which was printed a multiple image 2 composed of three single images, respectively 3, 4 and 19. The strips 12 belonging to the first image 3 have only been printed on the left flanks 9 of the reliefs 7 with trapezoidal section 18, those 13 belonging to the second image 4 only on the lower facets 20 and upper 21 planes reliefs 7 to trapezoidal section 18, and those 22 belonging to the third image 19 only on the right flanks 10 of the reliefs 7 trapezoidal section 18. A grazing vision from the left according to the arrow 14 allows to observe only the first image 3, a view from the front according to the arrow 23 only the second image 4 and a grazing vision from the right according to the arrow 15 only the third image 19. It can be equal imagine that the support is formed of linear parts juxtaposed movable by linear pivot about their longitudinal axis, in the manner of triangular movable mobile panels changing displays, each linear portion serving as a linear relief for the realization of the image multiple. The support 1 can also be animated so that a stationary observer can successively see all the single images composing the multiple image without having to move. According to the variants, the support 1 may be mobile as a whole or only at one or more of its parts.

The formation of a multiple image according to the invention can also be combined with other optical effects such as for example the production of image or parts of image in relief. The method according to the invention for making a multiple image on such a support will now be described in more detail. We begin by decomposing the simple images that must be part of the multiple image to be realized. Each of the simple images is cut into strips whose width corresponds to the width of the type of flanks or facets of the linear reliefs 7 of the support 1 on which the simple image must be made. The bands of the different single images are then intercalated alternately, according to the alternation of the flanks or facets of the linear reliefs 7 of the support 1, and in a repetitive manner so as to form by juxtaposition of the bands an interlaced overall image whose pitch corresponds to that of the periodic succession of the linear forms 7 of the support 1. These steps of cutting the simple images and recomposition of the overall image are preferably performed by means of appropriate image processing software. Next, printing, preferably by means of a digital inkjet printer, this global image interlaced directly on the upper face 11 of the support 1, by laterally calibrating the printing area so that each band of image is printed at one of the flanks or facets of the linear reliefs 7 of the support 1.

During this printing step, one can also take into account the extension provided by the slope relative to a flat support and try to minimize the effect of connection to the junction of two juxtaposed strips.

Advantageously, this printing step can perfectly be carried out with a conventional printing machine of the digital inkjet printer type, and using only conventional water-based inks for a corrugated cardboard support. At the exit of the printer, one directly obtains a multiple image support, without any additional step being necessary contrary to the prior art.

It is also possible to print the overall image interlaced on the upper sheet 5 of the support 1 while it is still flat, that is to say before it passes through the inverter or more generally in the shaper which produces the Linear reliefs 7. The printing is carried out flat in a conventional manner. Then, the printed topsheet 5 is appropriately shaped so that alternate strips of the interlaced overall image are each on the corresponding flank of the formed linear reliefs.

Alternatively, it is also possible to print the overall interlaced image flat on an independent flat sheet which is then secured, by gluing or by any other means, to the upper face 11 of the support 1 so as to cover and follow the linear reliefs 7 of it. During the securing step, the cover sheet must be positioned precisely on the support 1 so that the alternate strips of the interlaced overall image are then each found on the appropriate side of the linear reliefs. These last two variants of the production method, with flat printing and subsequent conformation, are quite delicate because they require a relatively high accuracy in the conformation step to avoid any lateral shift of the interlaced image bands with respect to linear reliefs 7 support 1 which could result in visual defects in the multiple image obtained.

For this reason, the first variant of the method is generally preferred by printing the overall image interlaced on the upper face 11 of the support 1 already shaped with its linear reliefs. Obviously, the invention is not limited to the modes of preferred embodiments described above and shown in the various figures, the skilled person can make many changes and imagine other variants without departing from the scope or scope of the invention defined by the claims.

Claims (13)

REVENDICATIONS1. Support (1) presenting a multiple image (2) composed of at least two different single images (3, 4, 19) that can be viewed successively and in isolation by changing the observation angle of the support, support (1) characterized in that it comprises on its upper face (11) linear reliefs (7) to at least two sidewalls (9, 10) or facets (20, 21), arranged side by side in a repetitive manner; in that the multiple image (2), formed of a succession of intertwined strips (12, 13, 22) belonging alternately to each of the single images (3, 4, 19) which compose it, is on the upper face (11) the support (1) at its linear reliefs (7); and in that all the bands belonging to the same single image composing the multiple image are on the same flank or facet of linear reliefs. 2. Multiple image carrier according to claim 1 characterized in that the multiple image (2) is printed. 3. Support according to any one of claims 1 or 2 characterized in that the multiple image (2) is composed of two or three single images (3, 4, 19). 4. Support according to any one of the preceding claims, characterized in that the linear reliefs (7) are corrugations, grooves (8) or linear reliefs with rounded section (8), triangular (16), rounded flattened apex (17) or trapezoidal (18). 5. multiple image carrier according to any one of the preceding claims characterized in that it is cardboard, paper, cardboard or plasticized paper, wood, plastic, synthetic material or composite materials. 6. multiple image carrier according to the preceding claim characterized in that it is made of corrugated cardboard, single-sided corrugated cardboard, or corrugated cardboard single-sided micro-flutes. 7. Multiple image carrier according to any one of the preceding claims characterized in that it comprises an upper sheet (5) itself presenting the linear reliefs (7). 8. multiple image carrier according to the preceding claim characterized in that it further comprises a base sheet (6) secured under the upper sheet (5). 9. Multiple image medium according to any one of the preceding claims, characterized in that it is a poster or an advertising display. 10. Multiple image medium according to any one of the preceding claims, characterized in that it is fully or partially animated so that a stationary observer can successively see all the single images composing the multiple image. 11. A method of producing a support (1) according to any one of the preceding claims, characterized in that it comprises the following steps: cutting of each single image (3, 4, 19) composing the multiple image (2) into strips (12, 13, 22) of width corresponding to that of the sidewall (9, 10) or the facet (20, 21). ) linear reliefs (7) of the support (1) on which they must be; . composition of a global image interlaced by juxtaposition of the bands coming from the simple images, these strips being intercalated alternately according to the alternation of the flanks or facets of the linear reliefs (7) of the support (1) on which they must be; . reproducing the overall image interlaced on the upper surface (11) in relief of the support (1) by calibrating it laterally so that each band (12, 13, 22) is found on the side (9, 10) or the facet (20). , 21) corresponding to the linear reliefs (7) of the support (1). 12. Method according to the preceding claim characterized in that the steps of cutting the single images (3, 4, 19) and composition of the overall interlaced image are performed by means of an image processing software. 13. Method according to any one of claims 11 or 12 characterized in that the printing step is performed by means of a digital inkjet printer.