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EP2572895B1 - Imprint with two graphic elements - Google Patents

Imprint with two graphic elements Download PDF

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Publication number
EP2572895B1
EP2572895B1 EP12186180.1A EP12186180A EP2572895B1 EP 2572895 B1 EP2572895 B1 EP 2572895B1 EP 12186180 A EP12186180 A EP 12186180A EP 2572895 B1 EP2572895 B1 EP 2572895B1
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EP
European Patent Office
Prior art keywords
pattern
angle
impression
marking
background
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP12186180.1A
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German (de)
French (fr)
Other versions
EP2572895A1 (en
Inventor
Muriel Burgada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EPGA
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EPGA
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Publication date
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Publication of EP2572895A1 publication Critical patent/EP2572895A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
    • B44B5/02—Dies; Accessories
    • B44B5/026—Dies

Definitions

  • the present invention relates to the technical field of marking or stamping articles made of paper, cardboard, plastics material, metal or any material capable of being marked by plastic deformation.
  • the invention relates to hot stamping possibly associated with the removal of a film of a specular material such as a film of a gold, silver or more generally shiny material.
  • the invention also relates to the field of marks or footprints of bas-relief type, that is to say having a shallow depth of relief, likely to be present on products or articles to decorate or to attest the origin.
  • the term "imprint” refers both to a three-dimensional structure present on a tool used to produce the marking or embossing of a product, to a three-dimensional structure that presents a product regardless of the technique used for the production. achieve.
  • the invention relates firstly but not exclusively to the geometric characteristics of the imprint that allow it to have the desired behavior, regardless of the technique used to make the imprint.
  • the value of the angle ⁇ of the first pattern is the opposite of the value of the angle ⁇ 'of the second pattern.
  • the angle ⁇ of the first pattern has a value substantially equal to 22.5 ° and the angle ⁇ 'of the second pattern has a value substantially equal to -22.5 °.
  • the background pattern is chosen to have a substantially identical and uniform visual rendering irrespective of the direction of observation of the impression or the angle of incidence of the light on the latter.
  • the background pattern may be formed by a random texture or pattern that will be perceived as optical noise by the observer of the impression at most viewing angles.
  • the angle ⁇ of the first bottom hatch has a value between 30 ° and 70 ° and the angle ⁇ 'of the second bottom hatch has a value between -30 ° and -70 °.
  • the value of the angle ⁇ of the first bottom hatch is the opposite of the value of the angle ⁇ 'of the second bottom hatch.
  • the value of the angle ⁇ is twice the value of the angle ⁇ ', and the value of the angle ⁇ is twice the value of the angle ⁇ '.
  • the value of the angle ⁇ is substantially -45 °, and the value of the angle ⁇ 'is substantially 45 °.
  • the bands forming part of the corresponding marking surface are alternately covered by the pattern of the corresponding graphic element and the background pattern. of the adjacent bottom part.
  • the width strips are between 0.3 mm and 1 mm.
  • the grooves and the ribs of the hatches have the same width l and the width bands are between 8 and 11 times the width l hatching.
  • the grooves and the ribs of the hatches have the same width l of between 0.03 mm and 0.1 mm.
  • the marking zone has an area of less than 36 cm 2 .
  • the depth of the grooves is between 0.03 mm and 0.05 mm.
  • the material constituting the entire surface of the imprint has a specular behavior.
  • the invention also relates to a matrix for marking paper, cardboard or material comprising at least one impression according to the invention.
  • the impression is made by photogravure of a metal plate.
  • the invention also relates to a print on a support obtained by marking the support by means of a matrix according to the invention. According to a feature of the invention this impression is coated with a film of a specular material.
  • the motifs of the graphic elements and the background are schematized or symbolized, on the figures 1 , 2, 4 and 5 by representations that do not correspond to the reality of the patterns actually implemented in the context of a print according to the invention. Indeed, the use of hatching would have made it difficult to understand the invention because of the optical perception aberrations induced by the hatching.
  • the outlines of the graphic elements and the bands are represented by continuous lines in order to simplify the understanding of the invention whereas on a footprint according to the invention the outlines of the graphic elements and the possible bands are not necessarily materialized by continuous lines.
  • the outlines of the graphic elements and any bands are not at all materialized by continuous lines on a fingerprint according to the invention.
  • An impression according to the invention comprises at least one marking zone 1 which according to the illustrated example has a rectangular shape, it being understood that any other shape could be envisaged.
  • the marking zone 1 preferably has an area of less than or equal to 36 cm 2 and more preferably less than 16 cm 2 . Indeed, the best results are obtained for reduced marking areas, especially when the surface of the marking area exhibits specular behavior while the surrounding region has a diffusing behavior.
  • the marking zone 1 comprises two graphical elements 2 and 3, a first 2 of which is formed, according to the example illustrated, by the letters "LY" and defines a first marking surface S1 represented by angled hatches while going up to the right to the figure 1 .
  • the second graphic element 3 is formed, according to the example illustrated, by the letters "ON” and defines a second marking surface S2 materialized by hatching hatched downwards to the right at the figure 1 .
  • the two graphical elements 2 and 3 intersect in regions of overlap 4 materialized by black solid areas at the figure 1 .
  • the objective of the invention is that the first 1 and second 3 graphic elements and the corresponding marking surfaces S1 and S2 have a behavior 5.
  • the first marking surface S2 is covered in part by at least one first pattern M1, while the second marking surface S3 is covered in part. at least a second pattern M2 distinct from the first pattern M1, the background 5 being covered with a background pattern MF distinct from the first M1 and the second pattern M2.
  • the background pattern MF is formed in the present case of the combination of two background hatches H1 and H1.
  • a pattern is a three-dimensional structure made in the surface of the product or material bearing the imprint. This three-dimensional structure then has a shallow depth compared to the thickness of the product or material bearing the imprint.
  • a motif in the sense of the invention can be called bas-reliefs.
  • the first pattern M1 and the second pattern M2 are both formed by a hatching comprising an alternation of grooves 10 and ribs 11 as schematically shown in FIG. figure 4 .
  • the term "groove” is used here to designate the recessed portion while the term “rib” refers to the bump portion of the three-dimensional structure constituting a pattern.
  • the depth P of a groove 10 is then measured between, on the one hand, a plane passing through the apex of the adjacent grooves and, on the other hand, the bottom of said groove.
  • the grooves are symbolized by the white lines while the grooves are symbolized by the black lines.
  • the grooves 10 of the various patterns or hatching of the cavity according to the invention preferably have a substantially identical depth and preferably between 0.03 mm and 0.05 mm.
  • This groove depth makes it possible to obtain an optical behavior in accordance with the objective of the invention in the case of an observation at a reading distance or a normal observation distance for a document such as a book, an official document or a package of a small product.
  • a reading distance or observation is for example of the order of 30 cm.
  • the first pattern M1 is therefore formed by a hatch whose grooves and ribs are parallel to each other and to a direction ⁇ , while the second pattern M2 is formed by a hatch whose grooves are parallel to each other and to a direction ⁇ '.
  • the directions ⁇ and ⁇ ' form an acute angle A.
  • the bottom portion 5 and, according to the illustrated example, the first S1 and second S2 marking surfaces are divided into strips 15 parallel to each other and to a direction D as shown by FIGS. Figures 2 and 5 .
  • the strips 15 all have the same width which is, according to the illustrated example, between 0.3 mm and 1 mm.
  • the first pattern M1 is then arranged in the first marking surface S1 so that the direction ⁇ of its hatching forms a positive acute angle ⁇ with the direction D of the strips 15.
  • the angle ⁇ preferably has a value of between 20 ° and 30 °.
  • the second pattern M2 is arranged in the second marking surface S2 so that the direction ⁇ 'of its hatching forms a negative acute angle ⁇ ' with the direction D of the strips 15.
  • the angle ⁇ ' has preferably a value between -20 ° and -30 °. More preferably, the angle ⁇ is the opposite of the angle ⁇ '.
  • the first bottom hatch H1 comprises an alternation of grooves and hatching parallel to each other and to a direction ⁇ which forms a negative acute angle ⁇ with the direction D of the strips 15.
  • the second bottom hatch H2 comprises an alternation of grooves and grooves. hatches parallel to each other and to a direction ⁇ 'which forms a positive acute angle ⁇ ' with the direction of the strips 15.
  • the angle ⁇ preferably has a value between -30 ° and -70 ° while the angle ⁇ 'preferably has a value between at least 30 ° and 70 °. More preferably, the angle ⁇ is the opposite of the angle ⁇ 'and is twice the value of the angle ⁇ ', the angle ⁇ 'then being twice the value of the angle ⁇ .
  • the grooves and the ribs of the hatches of all the patterns of the imprint have the same width l preferably between 0.3 mm and 0.1 mm.
  • the width strips 15 is chosen to be between 8 and 11 times the width l hatching.
  • the bottom hatches H1 and H2 are then arranged on the bottom 5 so as to alternately cover the strips 15 as shown in FIG. figure 5 .
  • the strips forming part of the corresponding marking surface are alternately covered by the first pattern M1, symbolized by white flat area, and the background pattern of the bottom zone adjacent here the first bottom hatch H1, symbolized by a grid in fine lines, as shown in FIG. figure 5 .
  • the strips forming part of the corresponding marking surface are alternately covered by the second pattern M2, symbolized by a black solid surface, and the background pattern of the bottom zone adjacent here the second bottom hatch H2 symbolized by a grid in thick lines.
  • each overlapping region 4 the bands forming part of said region 4 are alternately covered by the first pattern M1 for the part common to the first marking surface S1 and the corresponding strip and by the second pattern M2 for the part common to the second marking surface S2 and to the corresponding strip as shown in FIG. figure 5 .
  • each odd band 2n + 1 is covered by the first pattern M1 in its common part with the first graphic element 2 and each pair of banks covered by the second pattern M2 in its common part with the second element graph 3.
  • the angle of the hatching of the first pattern M1 is chosen to be of a sign opposite to that of the angle of the first bottom hatch H1 and it is the same for the hatching angle of the second pattern M2 relative to that of the angle of the second hatch H2.
  • the imprint thus formed can be produced by chemical photoetching of a metal plate such as, for example, aluminum, magnesium or copper to form a hot stamping die 20 of paper, cardboard or plastic. .
  • Such a matrix may for example be used for hot stamping a blank of cardboard with the interposition of a sheet bearing a material with specular behavior such as a gilding material or silver or a bright polymeric material.
  • the imprint thus obtained on the cardboard side has all the characteristics described above and its surface has a specular behavior which increases the efficiency of the play of light on the impression and makes it particularly difficult the acquisition by a scrolling scanner or a digital camera.
  • impression according to the invention is directly carried out everywhere appropriate process in the surface of a material itself specular or not and thus form a finished product.
  • the graphic elements 2 and 3 are each formed by two disjoint letters.
  • the graphic elements are not necessarily formed by one or more letters and may also include one or more drawings or a combination of one or more letters with one or more drawings.

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Description

La présente invention concerne le domaine technique du marquage ou estampage d'articles en papier, carton, matière plastique, métal ou tout matériau susceptible de faire l'objet d'un marquage par déformation plastique. Dans une application préférée mais non limitative, l'invention se rapporte au marquage à chaud éventuellement associé à la dépose d'une pellicule d'un matériau à comportement spéculaire telle qu'une pellicule d'un matériau doré, argenté ou plus généralement brillant.The present invention relates to the technical field of marking or stamping articles made of paper, cardboard, plastics material, metal or any material capable of being marked by plastic deformation. In a preferred but nonlimiting application, the invention relates to hot stamping possibly associated with the removal of a film of a specular material such as a film of a gold, silver or more generally shiny material.

L'invention concerne également le domaine des marques ou empreintes de type bas-relief, c'est-à-dire présentant une faible profondeur de relief, susceptibles d'être présentes sur des produits ou articles en vue de les décorer ou d'en attester l'origine.The invention also relates to the field of marks or footprints of bas-relief type, that is to say having a shallow depth of relief, likely to be present on products or articles to decorate or to attest the origin.

Dans les domaines ci-dessus, notamment en matière de protection contre la contrefaçon, il est cherché des marques ou des empreintes dont la complexité et/ou la structure les rend difficiles à reproduire en utilisant des moyens de reproduction grand public tels la photocopie ou l'impression offset. Parmi ces marques ou empreintes difficiles à reproduire, il est possible de citer les étiquettes hologrammes qui toutefois présentent l'inconvénient d'être relativement onéreuses à produire. Le document D1= WO-A-2007/144469 divulgue les caractéristiques du préambule de la revendication indépendante.In the above fields, particularly in the field of protection against counterfeiting, marks or imprints whose complexity and / or structure make them difficult to reproduce by using means of reproduction for the general public, such as photocopying or printing, are sought. offset printing. Among these marks or imprints difficult to reproduce, it is possible to mention the hologram labels which however have the disadvantage of being relatively expensive to produce. The document D1 = WO-2007/144469 discloses the features of the preamble of the independent claim.

Il est donc apparu le besoin d'un nouveau type de marquage qui puisse notamment être produit en grandes séries selon des techniques de marquage à chaud ou d'estampage moins onéreuses que les techniques de fabrication des étiquettes holographiques tout en présentant une grande difficulté voire une impossibilité de reproduction par la mise en oeuvre d'une acquisition au moyen d'un scanner optique puis d'une reproduction selon des techniques d'impression jet d'encre, d'impression laser, également appelée xérographie, ou encore d'impression offset.It has therefore emerged the need for a new type of marking which can notably be produced in large series using hot stamping or stamping techniques which are less expensive than the techniques for manufacturing holographic labels while presenting a great difficulty or even a problem. impossibility of reproduction by the implementation of an acquisition by means of an optical scanner and then a reproduction according to techniques of inkjet printing, laser printing, also called xerography, or offset printing .

Afin d'atteindre cet objectif l'invention concerne une empreinte comprenant au moins une zone de marquage qui comprend :

  • un premier élément graphique qui définit une première surface de marquage couverte, en partie au moins, d'un premier motif formé par une hachure comprenant une alternance de rainures et de nervures parallèles entre-elles et à une direction Δ,
  • deuxième élément graphique définissant une deuxième surface de marquage couverte, en partie au moins, d'un deuxième motif formé par une hachure comprenant une alternance de rainures et de nervures parallèles entre-elles et à une direction Δ' formant un angle aigu avec la direction Δ du premier motif,
  • une partie, appelée fond, de la zone de marquage qui n'est couverte ni par le premier élément graphique ni par le deuxième élément graphique et qui est couverte par un motif de fond distinct des premier et deuxième motifs,
  • la partie de fond au moins est divisée en bandes parallèles d'égale largeur
    Figure imgb0001
    et s'étendant selon une direction D,
  • la direction Δ du premier motif formant un angle aigu positif α avec la direction D,
  • la direction Δ' du deuxième motif formant un angle aigu négatif α' avec la direction D.
In order to achieve this objective the invention relates to a footprint comprising at least one marking zone which comprises:
  • a first graphic element which defines a first marking surface covered, in part at least, with a first pattern formed by a hatching comprising an alternation of grooves and ribs parallel to one another and to a direction Δ,
  • second graphic element defining a second marking surface covered, at least in part, with a second pattern formed by a hatching comprising an alternation of grooves and ribs parallel to one another and to a direction Δ 'forming an acute angle with the direction Δ of the first pattern,
  • a part, called the background, of the marking area which is not covered by the first graphic element or by the second graphic element and which is covered by a background pattern distinct from the first and second patterns,
  • the bottom portion at least is divided into parallel strips of equal width
    Figure imgb0001
    and extending in a direction D,
  • the direction Δ of the first pattern forming a positive acute angle α with the direction D,
  • the direction Δ 'of the second pattern forming a negative acute angle α' with direction D.

La présence sur l'empreinte de deux éléments graphiques dont les surfaces de marquage sont couvertes par des motifs de hachure distincts et orientés selon des angles différents permet d'obtenir un comportement à la lumière tel que selon une direction d'observation le premier élément graphique est mieux visible tandis que selon une autre direction d'observation c'est le deuxième élément graphique qui est mieux visible. Ainsi un observateur doit, pour être en mesure de lire ou d'identifier les deux éléments graphiques, se déplacer ou déplacer l'empreinte de manière à modifier à la fois l'angle d'incidence de la lumière et sa direction d'observation. Cette caractéristique rend difficile voire impossible une bonne acquisition de l'empreinte selon l'invention au moyen d'un scanner optique à balayage ou encore d'un appareil photo. En effet lors d'une telle tentative d'acquisition soit l'image obtenue sera floue soit l'image obtenue ne comportera qu'un seul des deux éléments graphiques. L'empreinte selon l'invention est donc difficile à reproduire dans un cadre de tentative de contrefaçon.The presence on the impression of two graphical elements whose marking surfaces are covered by distinct hatch patterns and oriented at different angles makes it possible to obtain a light behavior such that, according to an observation direction, the first graphic element is better visible while according to another direction of observation it is the second graphic element which is better visible. Thus an observer must, to be able to read or identify the two graphic elements, move or move the footprint so as to change both the angle of incidence of the light and its direction of observation. This feature makes it difficult or impossible to properly acquire the impression according to the invention by means of a scanning optical scanner or a camera. Indeed, during such an acquisition attempt either the image obtained will be fuzzy or the image obtained will comprise only one of the two graphic elements. The imprint according to the invention is therefore difficult to reproduce in an attempt to counterfeit.

Au sens de l'invention le terme « empreinte » vise aussi bien une structure tridimensionnelle présente sur un outil utilisé pour réaliser le marquage ou l'estampage d'un produit, qu'une structure tridimensionnelle présente un produit indépendamment de la technique utilisée pour la réaliser. Ainsi, l'invention se rapporte tout d'abord mais non exclusivement aux caractéristiques géométriques de l'empreinte qui lui permettent avoir le comportement recherché, indépendamment de la technique utilisée pour réaliser l'empreinte.For the purposes of the invention, the term "imprint" refers both to a three-dimensional structure present on a tool used to produce the marking or embossing of a product, to a three-dimensional structure that presents a product regardless of the technique used for the production. achieve. Thus, the invention relates firstly but not exclusively to the geometric characteristics of the imprint that allow it to have the desired behavior, regardless of the technique used to make the imprint.

Selon une variante de cette forme préférée :

  • l'angle α du premier motif possède une valeur comprise entre 20° et 30°,
  • l'angle α' du deuxième motif possède une valeur comprise entre -20° et -30°.
According to a variant of this preferred form:
  • the angle α of the first pattern has a value between 20 ° and 30 °,
  • the angle α 'of the second pattern has a value between -20 ° and -30 °.

Selon une autre variante de cette forme préférée, la valeur de l'angle α du premier motif vaut l'opposée de la valeur de l'angle α' du deuxième motif.According to another variant of this preferred form, the value of the angle α of the first pattern is the opposite of the value of the angle α 'of the second pattern.

Selon encore une autre variante de cette forme préférée, l'angle α du premier motif possède une valeur sensiblement égale à 22,5° et l'angle α' du deuxième motif possède une valeur sensiblement égale à -22,5°.According to yet another variant of this preferred form, the angle α of the first pattern has a value substantially equal to 22.5 ° and the angle α 'of the second pattern has a value substantially equal to -22.5 °.

Selon l'invention, le motif de fond est choisi pour avoir un rendu visuel sensiblement identique et uniforme quelle que soit la direction d'observation de l'empreinte ou encore l'angle d'incidence de la lumière sur cette dernière. Le motif de fond peut être formé par une texture ou un motif aléatoire qui sera perçu comme un bruit optique par l'observateur de l'empreinte dans la plupart des angles d'observation.According to the invention, the background pattern is chosen to have a substantially identical and uniform visual rendering irrespective of the direction of observation of the impression or the angle of incidence of the light on the latter. The background pattern may be formed by a random texture or pattern that will be perceived as optical noise by the observer of the impression at most viewing angles.

Selon une variante de la forme préférée de réalisation, le motif de fond est formé par deux hachures de fond couvrant alternativement les bandes parallèles dont :

  • une première hachure de fond comprend une alternance de rainures et de nervures parallèles entre-elles et à une direction γ formant, avec la direction D des bandes, un angle aigu négatif β distinct des angles α et α',
  • une deuxième hachure de fond comprend une alternance de rainures et de nervures parallèles entre-elles et à une direction γ' formant, avec la direction D des bandes, un angle aigu positif β' distinct des angles α, α' et β.
According to a variant of the preferred embodiment, the bottom pattern is formed by two bottom hatches alternately covering the parallel strips of which:
  • a first bottom hatching comprises an alternation of grooves and ribs parallel to each other and to a direction γ forming, with the direction D of the bands, a negative acute angle β distinct from the angles α and α ',
  • a second bottom hatching comprises an alternation of grooves and ribs parallel to each other and to a direction γ 'forming, with the direction D of the bands, a positive acute angle β' distinct from the angles α, α 'and β.

La combinaison des deux hachures de fond permet de réaliser une sorte de motif en chevron qui présente la particularité d'être effectivement perçu comme ayant une apparence identique quel que soit l'angle d'observation.The combination of the two bottom hatches makes it possible to produce a kind of chevron pattern which has the particularity of being effectively perceived as having an identical appearance whatever the angle of observation.

Selon une caractéristique de cette variante, l'angle β de la première hachure de fond possède une valeur comprise entre 30° et 70° et l'angle β' de la deuxième hachure de fond possède une valeur comprise entre -30° et -70°.According to a characteristic of this variant, the angle β of the first bottom hatch has a value between 30 ° and 70 ° and the angle β 'of the second bottom hatch has a value between -30 ° and -70 °.

Selon une autre caractéristique de cette variante, la valeur de l'angle β du de la première hachure de fond vaut l'opposée de la valeur de l'angle β' de la deuxième hachure de fond.According to another characteristic of this variant, the value of the angle β of the first bottom hatch is the opposite of the value of the angle β 'of the second bottom hatch.

Selon encore une autre caractéristique de cette variante la valeur de l'angle β vaut le double de la valeur de l'angle α', et la valeur de l'angle β vaut le double de la valeur de l'angle α'.According to yet another characteristic of this variant, the value of the angle β is twice the value of the angle α ', and the value of the angle β is twice the value of the angle α'.

Selon une caractéristique de cette variante, la valeur de l'angle β vaut sensiblement -45°, et la valeur de l'angle β' vaut sensiblement 45°.According to one characteristic of this variant, the value of the angle β is substantially -45 °, and the value of the angle β 'is substantially 45 °.

Selon une variante de la forme préférée de réalisation de l'empreinte conforme à l'invention :

  • l'ensemble de la zone de marquage est divisée selon les bandes de la partie de fond,
  • et, dans les régions où les deux éléments graphiques se chevauchent, les bandes s'inscrivant dans chaque région de chevauchement sont alternativement couvertes par :
    • le premier motif pour la partie commune à la première surface de marquage et à la bande correspondante,
    • le deuxième motif pour la partie commune à la deuxième surface de marquage et à la bande correspondante.
According to a variant of the preferred embodiment of the impression according to the invention:
  • the entire marking area is divided according to the bands of the bottom part,
  • and, in regions where the two graphical elements overlap, the bands in each overlapping region are alternately covered by:
    • the first pattern for the common part at the first marking surface and the corresponding strip,
    • the second pattern for the common part at the second marking surface and the corresponding strip.

Selon une caractéristique de cette variante, dans les régions où seul l'un des deux éléments graphiques est présent, les bandes s'inscrivant dans la surface de marquage correspondante sont alternativement couvertes par le motif de l'élément graphique correspondant et le motif de fond de la partie de fond adjacente.According to one characteristic of this variant, in the regions where only one of the two graphic elements is present, the bands forming part of the corresponding marking surface are alternately covered by the pattern of the corresponding graphic element and the background pattern. of the adjacent bottom part.

Selon une caractéristique de la forme préférée de réalisation de l'empreinte conforme à l'invention, la largeur

Figure imgb0002
des bandes est comprise entre 0,3 mm et 1 mm.According to one characteristic of the preferred embodiment of the impression according to the invention, the width
Figure imgb0002
strips are between 0.3 mm and 1 mm.

Selon une caractéristique de la forme préférée de réalisation de l'empreinte conforme à l'invention, les rainures et les nervures des hachures possèdent une même largeur ℓ et la largeur

Figure imgb0003
des bandes vaut entre 8 et 11 fois la largeur ℓ des hachures.According to one characteristic of the preferred embodiment of the impression according to the invention, the grooves and the ribs of the hatches have the same width ℓ and the width
Figure imgb0003
bands are between 8 and 11 times the width ℓ hatching.

Selon une caractéristique de l'invention, les rainures et les nervures des hachures possèdent une même largeur ℓ comprise entre 0,03 mm et 0,1 mm.According to one characteristic of the invention, the grooves and the ribs of the hatches have the same width ℓ of between 0.03 mm and 0.1 mm.

Selon une autre caractéristique de l'invention, la zone de marquage possède une surface inférieure à 36 cm2.According to another characteristic of the invention, the marking zone has an area of less than 36 cm 2 .

Selon encore une autre caractéristique de l'invention, la profondeur des rainures est comprise entre 0,03 mm et 0,05 mm.According to yet another characteristic of the invention, the depth of the grooves is between 0.03 mm and 0.05 mm.

Selon une caractéristique de l'invention visant à augmenter la difficulté de reproduction de l'empreinte selon l'invention, le matériau constitutif de l'ensemble de la surface de l'empreinte possède un comportement spéculaire.According to a feature of the invention to increase the difficulty of reproducing the impression according to the invention, the material constituting the entire surface of the imprint has a specular behavior.

L'invention concerne également une matrice pour le marquage de papier, carton ou matière comprenant au moins une empreinte conforme à l'invention.The invention also relates to a matrix for marking paper, cardboard or material comprising at least one impression according to the invention.

Selon une caractéristique de la matrice conforme à l'invention, l'empreinte est réalisée par photogravure d'une plaque de métal.According to a characteristic of the matrix according to the invention, the impression is made by photogravure of a metal plate.

L'invention concerne aussi une empreinte sur un support obtenue par marquage du support au moyen d'une matrice conforme à l'invention. Selon une caractéristique de l'invention cette empreinte est revêtue d'une pellicule d'un matériau spéculaire.The invention also relates to a print on a support obtained by marking the support by means of a matrix according to the invention. According to a feature of the invention this impression is coated with a film of a specular material.

Bien entendu, les différentes caractéristiques, variantes et formes de réalisation de l'invention peuvent être associées les unes avec les autres selon diverses combinaisons dans la mesure où elles ne sont pas incompatibles ou exclusives les unes des autres.Of course, the various features, variations and embodiments of the invention may be associated with each other in various combinations to the extent that they are not incompatible or exclusive of each other.

Par ailleurs, diverses autres caractéristiques de l'invention ressortent de la description annexée effectuée en référence aux dessins qui illustrent une forme non limitative de réalisation d'une empreinte conforme à l'invention.

  • La figure 1 est une vue schématique d'une empreinte selon l'invention montrant les différentes régions définies par les éléments graphiques et le fond de l'empreinte avec une symbolisation des motifs utilisés.
  • La figure 2 est une vue schématique de l'empreinte selon la figure 1 montrant une division, de l'empreinte et de ces éléments graphiques en bandes horizontales, utilisée pour la mise en place des motifs de l'empreinte.
  • La figure 3 est une vue montrant à une grande échelle deux motifs d'éléments graphiques et deux motifs de fond susceptibles d'être mis en oeuvre pour une empreinte selon l'invention.
  • La figure 4 est une section partielle, en coupe droite selon un plan normal à la surface supérieure de l'empreinte, d'un motif de l'empreinte conforme à l'invention
  • La figure 5 est une vue d'un détail V de la figure 2 à plus grande échelle montrant de manière schématique la mise en oeuvre des motifs de la figure 3.
Furthermore, various other features of the invention appear from the attached description with reference to the drawings which illustrate a non-limiting embodiment of a print according to the invention.
  • The figure 1 is a schematic view of a print according to the invention showing the different regions defined by the graphic elements and the bottom of the print with a symbolization of the patterns used.
  • The figure 2 is a schematic view of the impression according to the figure 1 showing a division, of the imprint and these graphic elements in horizontal bands, used for the establishment of the imprint patterns.
  • The figure 3 is a view showing on a large scale two graphic element patterns and two background patterns that can be implemented for a print according to the invention.
  • The figure 4 is a partial section, in straight section along a plane normal to the upper surface of the impression, of a pattern of the impression according to the invention
  • The figure 5 is a view of a detail V of the figure 2 on a larger scale schematically showing the implementation of the motives of the figure 3 .

Afin de faciliter la compréhension de l'invention, les motifs des éléments graphiques et du fonds sont schématisés ou symbolisés, sur les figures 1, 2, 4 et 5 par des représentations qui ne correspondent pas à la réalité des motifs effectivement mis oeuvre dans le cadre d'une empreinte selon l'invention. En effet, l'utilisation de hachures aurait rendu difficile la compréhension de l'invention en raison des aberrations de perception optique induites par les hachures. De plus, sur ces figures les contours des éléments graphiques et des bandes sont représentés par des lignes continues afin de simplifier la compréhension de l'invention alors que sur une empreinte selon l'invention les contours des éléments graphiques et des bandes éventuelles ne sont pas nécessairement matérialisés par des lignes continues. De manière préférée, les contours des éléments graphiques et des bandes éventuelles ne sont pas du tout matérialisés par des lignes continues sur une empreinte conforme à l'invention.In order to facilitate the understanding of the invention, the motifs of the graphic elements and the background are schematized or symbolized, on the figures 1 , 2, 4 and 5 by representations that do not correspond to the reality of the patterns actually implemented in the context of a print according to the invention. Indeed, the use of hatching would have made it difficult to understand the invention because of the optical perception aberrations induced by the hatching. Moreover, in these figures, the outlines of the graphic elements and the bands are represented by continuous lines in order to simplify the understanding of the invention whereas on a footprint according to the invention the outlines of the graphic elements and the possible bands are not necessarily materialized by continuous lines. Preferably, the outlines of the graphic elements and any bands are not at all materialized by continuous lines on a fingerprint according to the invention.

Une empreinte selon l'invention, désignée dans son ensemble par la référence E aux figures 1 et 2, comprend au moins une zone de marquage 1 qui selon l'exemple illustré présente une forme rectangulaire, étant entendu que toute autre forme pourrait être envisagée. La zone de marquage 1 possède de préférence une surface inférieure ou égale à 36 cm2 et de manière plus particulièrement préférée inférieure à 16 cm2. En effet, les meilleurs résultats sont obtenus pour des zones de marquage réduites, notamment lorsque la surface de la zone de marquage présente un comportement spéculaire alors que la région qui l'entoure possède un comportement diffusant.An impression according to the invention, generally designated by reference E figures 1 and 2 , comprises at least one marking zone 1 which according to the illustrated example has a rectangular shape, it being understood that any other shape could be envisaged. The marking zone 1 preferably has an area of less than or equal to 36 cm 2 and more preferably less than 16 cm 2 . Indeed, the best results are obtained for reduced marking areas, especially when the surface of the marking area exhibits specular behavior while the surrounding region has a diffusing behavior.

La zone de marquage 1 comprend deux éléments graphiques 2 et 3 dont un premier 2 est formé, selon l'exemple illustré, par les lettres « L Y » et définit une première surface de marquage S1 matérialisée par des hachures inclinées en montant vers la droite à la figure 1. Le deuxième élément graphique 3 est formé, selon l'exemple illustré, par les lettres « O N » et définit une deuxième surface de marquage S2 matérialisée par des hachures inclinées en descendant vers la droite à la figure 1. Les deux éléments graphiques 2 et 3 se recoupent dans des régions de chevauchement 4 matérialisées par des aplats de couleur noire à la figure 1.The marking zone 1 comprises two graphical elements 2 and 3, a first 2 of which is formed, according to the example illustrated, by the letters "LY" and defines a first marking surface S1 represented by angled hatches while going up to the right to the figure 1 . The second graphic element 3 is formed, according to the example illustrated, by the letters "ON" and defines a second marking surface S2 materialized by hatching hatched downwards to the right at the figure 1 . The two graphical elements 2 and 3 intersect in regions of overlap 4 materialized by black solid areas at the figure 1 .

La partie de la zone de marquage 1, qui n'est occupée ni par le premier élément graphique 2 ni par le deuxième élément graphique 3 ni encore par leurs régions de chevauchement 4, correspond à un fond 5 matérialisé par un aplat blanc à la figure 1.The part of the marking zone 1, which is occupied neither by the first graphical element 2 nor by the second graphic element 3 nor by their overlapping regions 4, corresponds to a background 5 represented by a white solid surface at the figure 1 .

L'objectif de l'invention est que les premier 1 et deuxième 3 éléments graphiques et les surfaces de marquage correspondantes S1 et S2 possèdent un comportement optique distinct l'un de l'autre ainsi que du fond 5. À cet effet, la première surface de marquage S2 est couverte en partie au moins d'un premier motif M1, tandis que la deuxième surface de marquage S3 est couverte en partie au moins d'un deuxième motif M2 distinct du premier motif M1, le fond 5 étant couvert d'un motif de fond MF distinct du premier M1 et du deuxième motif M2. Le motif de fond MF est formé dans le cas présent de la combinaison de deux hachures de fond H1 et H1. Ces motifs M1, M2, MF sont plus particulièrement illustrés à la figure 3.The objective of the invention is that the first 1 and second 3 graphic elements and the corresponding marking surfaces S1 and S2 have a behavior 5. For this purpose, the first marking surface S2 is covered in part by at least one first pattern M1, while the second marking surface S3 is covered in part. at least a second pattern M2 distinct from the first pattern M1, the background 5 being covered with a background pattern MF distinct from the first M1 and the second pattern M2. The background pattern MF is formed in the present case of the combination of two background hatches H1 and H1. These patterns M1, M2, MF are more particularly illustrated in the figure 3 .

Au sens de l'invention, un motif est une structure tridimensionnelle réalisée dans la surface du produit ou du matériau portant l'empreinte. Cette structure tridimensionnelle présente alors une faible profondeur par comparaison à l'épaisseur du produit ou du matériau portant l'empreinte. Ainsi, un motif au sens de l'invention peut être qualifié de bas-reliefs.Within the meaning of the invention, a pattern is a three-dimensional structure made in the surface of the product or material bearing the imprint. This three-dimensional structure then has a shallow depth compared to the thickness of the product or material bearing the imprint. Thus, a motif in the sense of the invention can be called bas-reliefs.

Selon l'invention, le premier motif M1 et le deuxième motif M2 sont tous deux formés par une hachure comprenant une alternance de rainures 10 et de nervures 11 comme le montrent schématiquement la figure 4. Le terme « rainure » est ici utilisé pour désigner la partie en creux tandis que le terme « nervure » désigne la partie en bosse de la structure tridimensionnelle constitutive d'un motif. La profondeur P d'une rainure 10 est alors mesurée entre, d'une part, un plan passant par le sommet des rainures adjacentes et, d'autre part, le fond de ladite rainure. Sur la figure 3, les rainures sont symbolisées par les lignes blanches tandis que les rainures sont symbolisées par les lignes noires.According to the invention, the first pattern M1 and the second pattern M2 are both formed by a hatching comprising an alternation of grooves 10 and ribs 11 as schematically shown in FIG. figure 4 . The term "groove" is used here to designate the recessed portion while the term "rib" refers to the bump portion of the three-dimensional structure constituting a pattern. The depth P of a groove 10 is then measured between, on the one hand, a plane passing through the apex of the adjacent grooves and, on the other hand, the bottom of said groove. On the figure 3 , the grooves are symbolized by the white lines while the grooves are symbolized by the black lines.

Les rainures 10 des différents motifs ou hachures de l'empreinte selon l'invention possèdent de préférence une profondeur sensiblement identique et de préférence comprise entre 0,03 mm et 0,05 mm. Cette profondeur de rainures permet d'obtenir un comportement optique conforme à l'objectif de l'invention dans le cas d'une observation à une distance de lecture ou d'observation normale pour un document tel qu'un livre, un document officiel ou un emballage d'un produit de petites dimensions. Une telle distance de lecture ou d'observation est par exemple de l'ordre de 30 cm.The grooves 10 of the various patterns or hatching of the cavity according to the invention preferably have a substantially identical depth and preferably between 0.03 mm and 0.05 mm. This groove depth makes it possible to obtain an optical behavior in accordance with the objective of the invention in the case of an observation at a reading distance or a normal observation distance for a document such as a book, an official document or a package of a small product. Such a reading distance or observation is for example of the order of 30 cm.

Le premier motif M1 est donc formé par une hachure dont les rainures et les nervures sont parallèles entre elles et à une direction Δ, tandis que le deuxième motif M2 est formé par une hachure dont les rainures sont parallèles entre elles et à une direction Δ'. Selon l'invention les directions Δ et Δ' forment un angle A aigu.The first pattern M1 is therefore formed by a hatch whose grooves and ribs are parallel to each other and to a direction Δ, while the second pattern M2 is formed by a hatch whose grooves are parallel to each other and to a direction Δ '. According to the invention the directions Δ and Δ 'form an acute angle A.

Afin de faciliter la disposition des motifs M1, M2 et des hachures de fond H1 et H2 à l'intérieur de l'empreinte et notamment au niveau de son fond 5, la partie de fond 5 et, selon l'exemple illustré, les première S1 et deuxième S2 surfaces de marquage sont divisées en bande 15 parallèles entre elles et à une direction D comme le montrent les figures 2 et 5. Les bandes 15 possèdent toutes une même largeur

Figure imgb0004
qui est, selon l'exemple illustré, comprise entre 0,3 mm et 1 mm.In order to facilitate the arrangement of the patterns M1, M2 and bottom hatches H1 and H2 within the cavity and in particular at its bottom 5, the bottom portion 5 and, according to the illustrated example, the first S1 and second S2 marking surfaces are divided into strips 15 parallel to each other and to a direction D as shown by FIGS. Figures 2 and 5 . The strips 15 all have the same width
Figure imgb0004
which is, according to the illustrated example, between 0.3 mm and 1 mm.

Le premier motif M1 est alors disposé dans la première surface de marquage S1 de manière que la direction Δ de ses hachures forme un angle aigu positif α avec la direction D des bandes 15. L'angle α possède de préférence une valeur comprise entre 20° et 30°.The first pattern M1 is then arranged in the first marking surface S1 so that the direction Δ of its hatching forms a positive acute angle α with the direction D of the strips 15. The angle α preferably has a value of between 20 ° and 30 °.

De la même manière, le deuxième motif M2 est disposé dans la deuxième surface de marquage S2 de manière que la direction Δ' de ses hachures forme un angle aigu négatif α' avec la direction D des bandes 15. L'angle α' possède de préférence une valeur comprise entre -20° et -30°. De manière plus particulièrement préférée l'angle α est l'opposé de l'angle α'.In the same manner, the second pattern M2 is arranged in the second marking surface S2 so that the direction Δ 'of its hatching forms a negative acute angle α' with the direction D of the strips 15. The angle α 'has preferably a value between -20 ° and -30 °. More preferably, the angle α is the opposite of the angle α '.

La première hachure de fond H1 comprend une alternance de rainures et de hachures parallèles entre elles et à une direction γ qui forme un angle aigu négatif β avec la direction D des bandes 15. La deuxième hachure de fond H2 comprend une alternance de rainures et de hachures parallèles entre elles et à une direction γ' qui forme un angle aigu positif β' avec la direction des bandes 15.The first bottom hatch H1 comprises an alternation of grooves and hatching parallel to each other and to a direction γ which forms a negative acute angle β with the direction D of the strips 15. The second bottom hatch H2 comprises an alternation of grooves and grooves. hatches parallel to each other and to a direction γ 'which forms a positive acute angle β' with the direction of the strips 15.

L'angle β possède de préférence une valeur comprise entre -30° et -70° tandis que l'angle β' possède de préférence une valeur comprise entre au moins 30° et 70°. De manière plus particulièrement préférée l'angle β est l'opposé de l'angle β' et vaut le double de la valeur de l'angle α', l'angle β' valant alors le double de la valeur de l'angle α.The angle β preferably has a value between -30 ° and -70 ° while the angle β 'preferably has a value between at least 30 ° and 70 °. More preferably, the angle β is the opposite of the angle β 'and is twice the value of the angle α', the angle β 'then being twice the value of the angle α .

De manière préférée, les rainures et les nervures des hachures de l'ensemble des motifs de l'empreinte possèdent une même largeur ℓ de préférence comprise entre 0,3 mm et 0,1 mm. Par ailleurs, la largeur

Figure imgb0005
des bandes 15 est choisie pour valoir entre 8 et 11 fois la largeur ℓ des hachures.Preferably, the grooves and the ribs of the hatches of all the patterns of the imprint have the same width ℓ preferably between 0.3 mm and 0.1 mm. Moreover, the width
Figure imgb0005
strips 15 is chosen to be between 8 and 11 times the width ℓ hatching.

Les hachures de fond H1 et H2 sont alors disposées sur le fond 5 de manière à couvrir alternativement les bandes 15 comme le montre la figure 5.The bottom hatches H1 and H2 are then arranged on the bottom 5 so as to alternately cover the strips 15 as shown in FIG. figure 5 .

Dans la zone première zone de marquage S1 où seul le premier élément graphique 2 est présent les bandes s'inscrivant dans la surface de marquage correspondante sont alternativement couvertes par le premier motif M1, symbolisé par in aplat blanc, et le motif de fond de la zone de fond adjacente ici la première hachure de fond H1, symbolisée par un quadrillage en traits fins, comme le montre la figure 5. De la même manière, dans la zone deuxième zone de marquage S2 où seul le deuxième élément graphique 3 est présent les bandes s'inscrivant dans la surface de marquage correspondante sont alternativement couvertes par le deuxième motif M2, symbolisé par un aplat noir, et le motif de fond de la zone de fond adjacente ici la deuxième hachure de fond H2 symbolisée par un quadrillage en traits épais.In the first marking area S1 area where only the first graphic element 2 is present, the strips forming part of the corresponding marking surface are alternately covered by the first pattern M1, symbolized by white flat area, and the background pattern of the bottom zone adjacent here the first bottom hatch H1, symbolized by a grid in fine lines, as shown in FIG. figure 5 . In the same way, in the second marking area S2 area where only the second graphic element 3 is present, the strips forming part of the corresponding marking surface are alternately covered by the second pattern M2, symbolized by a black solid surface, and the background pattern of the bottom zone adjacent here the second bottom hatch H2 symbolized by a grid in thick lines.

Par ailleurs, dans chaque région de chevauchement 4, les bandes s'inscrivant dans ladite région 4 sont alternativement couvertes par le premier motif M1 pour la partie commune à la première surface de marquage S1 et à la bande correspondante et par le deuxième motif M2 pour la partie commune à la deuxième surface de marquage S2 et à la bande correspondante comme le montre la figure 5.Moreover, in each overlapping region 4, the bands forming part of said region 4 are alternately covered by the first pattern M1 for the part common to the first marking surface S1 and the corresponding strip and by the second pattern M2 for the part common to the second marking surface S2 and to the corresponding strip as shown in FIG. figure 5 .

De plus, selon l'exemple illustré, les différents motifs M1, M2 et MF, formés des hachures de-Fonds H1 et H2, sont organisés de manière que :

  • pour chaque bande impaire 152n+1 le motif de fond, ici H1, occupe toute la surface de la bande impaire 152n+1 sauf pour sa région commune avec le premier élément graphique 2, appartenant donc à la première surface de marquage S1, qui est occupé par le premier motif M1, la partie commune de la bande impaire 152n+1 avec le deuxième élément graphique 3 étant donc couverte du motif de fond H1 de la bande impaire 152n+1,
  • pour chaque bande paire 152n le motif de fond, ici H2, occupe toute la surface de la bande paire 152n sauf pour sa région commune avec le deuxième élément graphique 3, appartenant donc à la deuxième surface de marquage S2, qui est occupé par le deuxième motif M2, la partie commune de la bande paire 152n avec le premier élément graphique 2 étant donc couverte du motif de fond H2 de la bande impaire.
In addition, according to the illustrated example, the different patterns M1, M2 and MF, formed of the H1 and H2 fund hatches, are organized in such a way that:
  • for each odd band 2n + 1 the background pattern, here H1, occupies the entire area of the odd band 2n + 1 except for its region common with the first graphic element 2, thus belonging to the first marking surface S1, which is occupied by the first pattern M1, the common part of the odd band 2n + 1 with the second graphic element 3 thus being covered with the background pattern H1 of the odd band 2n + 1 ,
  • for each pair band 2n the background pattern, here H2, occupies the entire area of the even band 2n except for its region common with the second graphic element 3, therefore belonging to the second marking surface S2, which is occupied by the second pattern M2, the common part of the even band 2n with the first graphic element 2 thus covered with the background pattern H2 of the odd band.

Ainsi dans les régions de chevauchement 4, chaque bande impaire 152n+1 est couverte par le premier motif M1 dans sa partie commune avec le premier élément graphique 2 et chaque banque paire couverte par le deuxième motif M2 dans sa partie commune avec le deuxième élément graphique 3.Thus, in the overlapping regions 4, each odd band 2n + 1 is covered by the first pattern M1 in its common part with the first graphic element 2 and each pair of banks covered by the second pattern M2 in its common part with the second element graph 3.

Afin de favoriser un comportement optique favorable à une lecture alternée de deux éléments graphiques en fonction de l'angle de lecture et de l'angle d'incidence de la lumière, l'angle des hachures du premier motif M1 est choisi pour être d'un signe opposé à celui de l'angle des première hachure de fond H1 et il en est de même pour l'angle des hachures du deuxième motif M2 par rapport à celui de l'angle des deuxièmes hachures H2.In order to favor an optical behavior favorable to an alternating reading of two graphic elements as a function of the angle of reading and the angle of incidence of the light, the angle of the hatching of the first pattern M1 is chosen to be of a sign opposite to that of the angle of the first bottom hatch H1 and it is the same for the hatching angle of the second pattern M2 relative to that of the angle of the second hatch H2.

L'empreinte ainsi constituée peut être réalisée par photogravure chimique d'une plaque de métal tel que par exemple de l'aluminium, du magnésium ou encore du cuivre pour former une matrice 20 de marquage à chaud de papier, de carton ou de matière plastique.The imprint thus formed can be produced by chemical photoetching of a metal plate such as, for example, aluminum, magnesium or copper to form a hot stamping die 20 of paper, cardboard or plastic. .

Une telle matrice peut par exemple être utilisée pour estamper à chaud un flan de carton avec interposition d'une feuille portant un matériau à comportement spéculaire tel que un matériau de dorure ou d'argent ou encore un matériau polymère brillant.Such a matrix may for example be used for hot stamping a blank of cardboard with the interposition of a sheet bearing a material with specular behavior such as a gilding material or silver or a bright polymeric material.

L'empreinte ainsi obtenue sur le flanc de carton présente toutes les caractéristiques décrites précédemment et sa surface possède un comportement spéculaire qui augmente l'efficacité du jeu de lumière sur l'empreinte et en rend particulièrement difficile l'acquisition par un scanner à défilement ou un appareil photo numérique.The imprint thus obtained on the cardboard side has all the characteristics described above and its surface has a specular behavior which increases the efficiency of the play of light on the impression and makes it particularly difficult the acquisition by a scrolling scanner or a digital camera.

Bien entendu, il est possible que l'empreinte selon l'invention soit directement réalisée partout procédé approprié dans la surface d'un matériau lui-même spéculaire ou non et former ainsi un produit fini.Of course, it is possible that the impression according to the invention is directly carried out everywhere appropriate process in the surface of a material itself specular or not and thus form a finished product.

Selon l'exemple décrit précédemment en relation avec les figures 1 à 5, les éléments graphiques 2 et 3 sont chacun formés par deux lettres disjointes. Toutefois, selon l'invention les éléments graphiques ne sont pas nécessairement formés par une ou plusieurs lettres et peuvent également comprendre un ou plusieurs dessins ou encore une combinaison d'une ou plusieurs lettres avec un ou plusieurs dessins.According to the example described above in relation to the Figures 1 to 5 , the graphic elements 2 and 3 are each formed by two disjoint letters. However, according to the invention the graphic elements are not necessarily formed by one or more letters and may also include one or more drawings or a combination of one or more letters with one or more drawings.

Bien entendu, diverses autres modifications peuvent être apportées à l'empreinte selon l'invention dans le cadre des revendications annexées.Of course, various other modifications may be made to the imprint according to the invention within the scope of the appended claims.

Claims (14)

  1. Impression comprising at least one marking zone (1) that comprises:
    - a first graphical element (2) that defines a first marking surface (S1) at least partly covered by a first pattern (M1) formed by hatching comprising an alternation of grooves (10) and ribs (11) parallel to each other and to a direction Δ,
    - a second graphical element (3) defining a second marking surface (S2) at least partly covered by a second pattern formed by hatching comprising an alternation of grooves (10) and ribs (11) parallel to each other and to a direction (Δ') forming an acute angle (A) with the direction (Δ) of the first pattern (M1),
    - a part (5), referred to as the background, of the marking zone (1) that is covered neither by the first graphical element (2) nor by the second graphical element (3), which is covered by a background pattern (MF) distinct from the first (M1) and second (M2) patterns and is divided into parallel bands (15) of equal width (
    Figure imgb0008
    ) and extending in a direction (D),
    - the direction (Δ) of the first pattern (M1) forming a positive acute angle α with the direction (D)
    - and the direction (Δ') of the second pattern (M2) forming a negative acute angle α' with the direction (D).
  2. Impression according to claim 1, characterised in that the value of the angle α of the first pattern (M1) is equal to the opposite to the value of the angle α' of the second pattern (M2).
  3. Impression according to claim 1 or 2, characterised in that the background pattern (MF) is formed by two background hatchings covering alternately the parallel bands (15), wherein:
    - a first background hatching (H1) comprises an alternation of grooves and ribs parallel to each other and to a direction γ forming, with the direction D of the bands (15), a negative acute angle β distinct from the angles α and α',
    - a second background hatching (H2) comprises an alternation of grooves and ribs parallel to each other and to a direction γ' forming, with the direction D of the bands (15), a positive acute angle β' distinct from the angles α, α' and β.
  4. Impression according to claim 3, characterised in that the value of the angle β of the first background hatching (H1) is equal to the opposite to the value of the angle β' of the second background hatching (H2).
  5. Impression according to claim 3 or 4, characterised in that:
    - the value of the angle β is equal to twice the value of the angle α,
    - and the value of the angle β' is equal to twice the value of the angle α'.
  6. Impression according to one of claims 1 to 5, characterised in that:
    - the whole of the marking zone (1) is divided in accordance with the bands (15) of the background part,
    - and, in the regions where the two graphical elements overlap, the bands (15) fitting in an overlap region are alternately covered by:
    - the first pattern (M1) for the part common to the first marking surface (S1) and to the corresponding band,
    - the second pattern for the part common to the second marking surface (S2) and to the corresponding band.
  7. Impression according to claim 6, characterised in that, in the regions where only one (2) of the two graphical elements is present, the bands (15) fitting in the corresponding marking surface (S1) are alternately covered by the pattern (M1, M2) of the corresponding graphical element (2) and the background pattern (MF) of the adjacent background part.
  8. Impression according to one of claims 1 to 7, characterised in that the grooves (10) and the ribs (11) of the hatchings have the same width (ℓ) and in that the width (
    Figure imgb0009
    ) of the bands (15) is equal to between 8 and 11 times the width (ℓ).
  9. Impression according to one of the preceding claims, characterised in that the grooves (10) and the ribs (11) of the hatchings have the same width ℓ of between 0.03 mm and 0.1 mm.
  10. Impression according to one of the preceding claims, characterised in that the depth (P) of the grooves (10) is between 0.03 mm and 0.05 mm.
  11. Impression according to one of the preceding claims, characterised in that the material constituting the whole of the surface of the impression has a specular behaviour.
  12. Die for marking paper, cardboard or material, comprising at least one impression (E) according to one of the preceding claims.
  13. Die according to claim 12, characterised in that the impression (E) is produced by chemical photoetching of a metal plate.
  14. Impression on a substrate obtained by marking the substrate by means of a die (20) according to claim 12 or 13.
EP12186180.1A 2011-09-26 2012-09-26 Imprint with two graphic elements Not-in-force EP2572895B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1158534A FR2980396B1 (en) 2011-09-26 2011-09-26 IMPRINT WITH TWO GRAPHIC ELEMENTS

Publications (2)

Publication Number Publication Date
EP2572895A1 EP2572895A1 (en) 2013-03-27
EP2572895B1 true EP2572895B1 (en) 2015-11-18

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EP12186180.1A Not-in-force EP2572895B1 (en) 2011-09-26 2012-09-26 Imprint with two graphic elements

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EP (1) EP2572895B1 (en)
FR (1) FR2980396B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107662538B (en) * 2017-08-02 2024-07-19 华域视觉科技(上海)有限公司 Automobile lamp fitting with dermatoglyph outer surfaces with different graphic textures

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10044465A1 (en) * 2000-09-08 2002-03-21 Giesecke & Devrient Gmbh Data carrier with an optically variable element
FI20065407A0 (en) * 2006-06-14 2006-06-14 Avantone Oy Hard forgery hologram
AU2010251862A1 (en) * 2009-05-25 2011-12-08 Watermarx Technology Pty Limited Fabrication of photopolymer dies

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FR2980396A1 (en) 2013-03-29
EP2572895A1 (en) 2013-03-27
FR2980396B1 (en) 2014-09-05

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