EP3717271A1 - Élément de sécurité à image cachée, document de sécurité et procédé de fabrication d'un élément de sécurité - Google Patents

Élément de sécurité à image cachée, document de sécurité et procédé de fabrication d'un élément de sécurité

Info

Publication number
EP3717271A1
EP3717271A1 EP18836936.7A EP18836936A EP3717271A1 EP 3717271 A1 EP3717271 A1 EP 3717271A1 EP 18836936 A EP18836936 A EP 18836936A EP 3717271 A1 EP3717271 A1 EP 3717271A1
Authority
EP
European Patent Office
Prior art keywords
lines
embossed structure
geometric shapes
background layer
colour
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.)
Pending
Application number
EP18836936.7A
Other languages
German (de)
English (en)
Inventor
Dariusz Dabrowski
Agata WOJCIECHOWSKA
Joanna Gurtowska
Pawel Wójcik
Marta FUSNIK
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.)
Polska Wytwornia Papierow Wartosciowych SA
Original Assignee
Polska Wytwornia Papierow Wartosciowych SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Polska Wytwornia Papierow Wartosciowych SA filed Critical Polska Wytwornia Papierow Wartosciowych SA
Publication of EP3717271A1 publication Critical patent/EP3717271A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/342—Moiré effects

Definitions

  • the invention relates to a security element with hidden picture, security document consisting of such a security element, and a method for producing such security element, the security element consists of a background layer in a form of sequences of parallel first lines, and of an embossed structure having such parameters that one obtains various colour effects for individual parts of the picture constituting the security element.
  • Security elements in a form of embossed optically variable structures give unique effects.
  • a valuable and/or security document consists of an element in a form of embossed optically variable structure is easily identified, both visually as well as tactilely but difficult to produce and counterfeit.
  • Security elements with an angular effect are produced by printing lines located at an appropriate angle relative to each other. Embossed lines consisting of the security pattern are perpendicular to the substrate background. The singular effect becomes visible, since the ink applied onto the substrate is of significant thickness, and at an appropriate angle, the pattern is dark or bright.
  • One group of security elements consist of printed security elements applied by a printing technique, that contain a pattern of thin lines.
  • the thin lines are used with such a frequency of lines per unit area, that an observer looking at the valuable and/or security document can see, at the first moment, not single lines but rather a surface of some texture or some colour.
  • known security elements are produced from many embossed lines divided into partial areas, in which lines run horizontally or vertically, creating a raster structure. These lines adjoin each other directly, and have, usually, a triangular cross- section profile. In this case, depending on the observation angle, one can see either the security element of practically uniform colour or only a part of this element. Also, it is possible to arrange raised lines having a triangular profile in the security element such that grooves are created that come from joining two lines. Each of the lines located in a partial area is a raised line in terms of width and spacing between the lines, having such dimensions that the sequence of lines in the partial area encodes a picture or pictures. A graphical element is printed onto the substrate of a valuable and/or security document.
  • the background is embossed with or without ink, according to the first raster of lines and with a given slope, whereas a hidden security element is placed such that to create a gap in the raster, according to another angle, for example perpendicular to the first slope such that the latent image is difficult to detect at a typical observation direction relative to the substrate plane but it is detectable when observing sideways.
  • the goal of the present invention is to overcome these drawbacks by providing a security element consisting of a background layer in a form of sequences of parallel first lines and an embossed structure of any arbitrary shape creating a multicoloured hidden picture with a clear colour division of individual parts of the picture, a document consisting of such a security element, and a method of producing thereof, being, simultaneously, very simple and cheap to produce but also difficult to counterfeit as well as easy to verify.
  • security and/or valuable document means all documents, such as banknotes, personal documents, driving licence, cheques, securities, tickets, passports, as well as other valuable and secured documents, and data storage media for safe storing data.
  • security document or“valuable document” are used interchangeably.
  • a substrate may be, for example, a paper substrate, a paper like substrate and/or a substrate made from paperlike materials like teslin, a polymer substrate, including polypropylene (PP) and/or polyamide (PA), as well as hybrid background based on a paper/polymer combination.
  • a paper substrate a paper like substrate and/or a substrate made from paperlike materials like teslin
  • a polymer substrate including polypropylene (PP) and/or polyamide (PA), as well as hybrid background based on a paper/polymer combination.
  • PP polypropylene
  • PA polyamide
  • An illuminant is a radiation source having a power distribution within the wavelength range capable of inducing photo-impressions, 380 nm ⁇ l ⁇ 780 nm.
  • Different illuminant light sources exist. Illuminants include different tones of daylight, various colours of artificial lighting, colours of spectral lines, and colours of phosphors.
  • secondary light sources exist that shine with reflected or transmitted light, as, for example, stained glass, the colour of which depends on the original light source it is illuminated with. Thus, saying that a security element has a given colour, one must indicate the illumination type the colour is detected.
  • Objects are observed due to the light transmitted by the objects (like, e.g., fluids, stained glass) or reflected from the objects (walls, paintings, etc).
  • An eye receives a stream of light originating from an illuminant and transmitted through or reflected from an observed object.
  • the colour of an object reflecting or transmitting the light depends on the light it is observed at.
  • a coloured object will have different colours when observing it under glow lamp light, daylight, and yet another colour will be perceived when illuminating the object with a bulb.
  • the illuminant has a colour temperature of 6774K and gives an impression of cool white light (CW). Also, other illuminants exist that correspond to diffused light under different geographical conditions. For the purposes of the present invention, it has been assumed that a security and/or valuable document is observed in the diffused light.
  • a security and/or valuable document consists of a security element in a form of a hidden picture.
  • the picture may be of any, complex shape, and it may be unicoloured or multicoloured.
  • the security element defines a sequence of parallel first lines superimposed onto the substrate, the sequence consists of at least two parallel, colour lines of the same widths. One of these lines within the sequence may have a substrate colour.
  • the background layer defines a sequence of parallel first lines having L different colours, the sequence being repeated any arbitrary number of times. One sequence may be created by two, three, or four lines of different colours, or even 16 colours, however, even then the substrate colour may be an additional line colour in the sequence of the first lines.
  • the present invention is not restricted to any specific number of colours in a single sequence of the first lines.
  • a sequence of the first lines is created, individually or collectively, by colours, most preferably, from the CMY palette: C- Cyan, M- Magenta, Y- Yellow, but also colours from the PANTONE palette are used.
  • Cyan is a tone of blue, but slightly brighter and more faded, it may be referred to as grey/sky-blue or livid/blue. Most similar colours are sky-blue, sapphire, and turquoise.
  • Magenta is, in the additive synthesis, a colour derived by combining red and blue.
  • the sequence of the first lines may also be created, individually or collectively, by colours from palette RGB: R - Red , G - Green, and B - Blue.
  • RGB colour space involves the additive synthesis, in which the lowest values define the colour black, whereas the highest ones - white.
  • colours are produced by illuminating coloured objects with the white light.
  • An example is insertion a colour filter (stained glass) in the path of the light to the eye, or many filters in a cascade. Filters absorb some colours (some portion of the spectrum), and an observer receives the light of the complementary colour relative to the absorbed colour.
  • the filter absorbs colour red, the observer receives Cyan (C), when green, the observer can see Magenta (M), when the blue is absorbed, then the observer can see Yellow (Y).
  • C Cyan
  • M Magenta
  • Y Yellow
  • the primary colours of the CMY system are the complementary colours to the RGB palette.
  • the subject matter of the invention is a security element, in a form of a hidden picture, consisting of:
  • the background layer being at least one sequence of parallel first lines consisting of at least two lines of different colours
  • the substrate colour may be one of the colours of the sequences of the first lines, and the lines in the sequence of the first lines have the same width
  • the embossed structure may be created by equidistant, relative to each other, first geometric shapes, and the hidden picture is obtained by embossing the first geometric shapes of the embossed structure with a shift relative to the sequences of the first lines of the background layer.
  • the security element may possess at least one inked embossed structure consisting of equidistant, relative to each other, second geometric shapes embossed, and covered with ink on the background layer.
  • the geometric shapes are equidistant, when lines going through the centres of these geometric shapes, drawn perpendicularly to the shift direction, are at the same distance within a single part of the hidden or visible picture.
  • the security element may consist of a hidden picture along with a visible picture obtained by embossing the second geometric shapes of the inked embossed structure, with a shift relative to the sequences of the first lines of the background layer.
  • the shift of the first geometric shapes of the embossed structure and/or second geometric shapes of the inked embossed structure relative to the sequences of the first lines of the background layer is a parallel shift.
  • L denotes the number of different colours in a sequence of the first lines
  • n denotes the width of a single line in a sequence of the first lines
  • the coefficient w is responsible for a single transition between the used colours. In order to obtain z colour transitions, the coefficient w is multiplied by a value of z-1.
  • first geometric shapes of the embossed structure and/or second geometric shapes of the inked embossed structure, as described above, may be shifted clockwise or anticlockwise relative to the sequences of the first lines by a predetermined angle.
  • the predetermined angle is from 1° to 12°, preferably it is equal to 6°.
  • the security element has an embossed structure, that consists of equidistant relative to each other, first geometric shapes, whereas the inked embossed structure consist of equidistant, relative to each other, second geometric shapes, that have a form of a grid of different elements, the shape of which depends on a designed hidden and/or visible picture of the security element.
  • a first element and/or part of the hidden picture in at least one colour of the background layer is obtained by embossing the first geometric shapes of the embossed structure with a shift relative to the sequences of the first lines of the background layer.
  • the first element and/or part of the hidden picture in one colour of the background layer is obtained by embossing the first geometric shapes of the embossed structure with a shift relative to the sequences of the first lines of the background layer by an integer multiple of the line width, wherein width of a single first geometric shape may not be bigger than n, and a single first shape of the embossed structure is located within a single line of the background layer.
  • the second element and/or part of the hidden picture in at least one another colour of the background layer is obtained by embossing the first geometric shapes of the embossed structure of the second element and/or part with a shift by an additional distance relative to the first geometric shapes of the embossed structure of the first element and/or part of the hidden picture.
  • the second element and/or part of the hidden picture in one another colour of the background layer, wherein the width of a single first geometric shape may not be bigger than n is obtained by embossing the first geometric shapes of the embossed structure of the second element and/or part of the hidden picture with a shift by an additional distance equal to an integer multiple of the width of the first lines of the background layer relative to the first geometric shapes of the embossed structure of the first element and/or part of the hidden picture, wherein the width of a single first geometric shape may not be bigger than n.
  • the inked embossed structure is inked with at least one intaglio ink.
  • the single geometric shape of the first geometric shapes of the embossed structure has a width in the range from n-50%n to n+50%n
  • the single geometric shape from the second geometric shapes of the inked embossed structure has a width in the range from n to Ln— f, where:
  • L denotes the number of different colours in a sequence of the first lines
  • n denotes the width of a single line in the sequence of the first lines.
  • the background layer defines a multiple of sequences of the first lines of different colours, that are repeating in the same order.
  • One sequence of the first lines is defined by three different colours.
  • the angle at a profile base to obtain a single geometric shape of the first geometric shapes of the embossed structure and/or the angle at a profile base to obtain a single geometric shape from the second geometric shapes of the inked embossed structure is from 15° to 90°.
  • the invention relates to a method for manufacturing a security element, in a form of a hidden picture, on a security and/or valuable document, comprising the steps of: a) applying a background layer onto a substrate, the background layer being at least one sequence of parallel first lines comprising at least two lines of different colours, and the substrate colour may be one of the colours of the sequence of the first lines of the background layer, and the lines in the sequence of the first lines have the same width, b) embossing at least one embossed structure on the background layer, wherein the embossed structure consists of equidistant, relative to each other, first geometric shapes shifted relative to the sequences of the first lines, wherein the hidden picture is obtained by embossing the first geometric shapes of the embossed structure (104, 204, 304, 404) with a shift relative to the sequences of the first lines.
  • the method comprises the following step:
  • L denotes the number of different colours in the sequence of the first lines
  • n denotes the width of a single line in the sequence of the first lines
  • the first geometric shapes of the embossed structure and/or the second geometric shapes of the inked embossed structure may be turned clockwise or anticlockwise relative to the sequences of the first lines by a predetermined angle.
  • the predetermined angle is from 1° to 12°, preferably it is equal to 6°.
  • the embossed structure is defined by equidistant, relative to each other, first geometric shapes, whereas the inked embossed structure consist of equidistant, relative to each other, second geometric shapes, that have a form of a grid of different elements, the shape of which depends on the designed hidden and/or visible picture of the security element.
  • the second element and/or part of the hidden picture in at least one another colour of the background layer is obtained by shifting the first geometric shapes of the embossed structure of the second element and/or part by an additional distance relative to the first geometric shapes of the embossed structure of the first element and/or part of the hidden picture.
  • the sequences of the parallel first lines of the background layer are produced by offset printing, letterset printing, or flexographic printing.
  • the embossed structure is produced by blind embossing, whereas the inked embossed structure is produced by wet embossing using at least one intaglio ink.
  • the inked embossed structure is embossed in the same run as the first geometric shapes of the blind embossed structure.
  • a single shape of the first geometric shapes of the blind embossed structure has a width in the range from n-50%n to n+50%n
  • a single shape of the second geometric shapes of the inked embossed structure has a width in the range from n to Ln - 7, where:
  • L denotes the number of different colours in the sequence of the first lines
  • n denotes the width of a single line in the sequence of the first lines. Also, the invention relates to a security and/or valuable document comprising a security element as defined above.
  • the security and/or valuable document is produced from one: paper, polymer, a combination thereof, and/or bound paper materials, paperlike, and/or polymer materials.
  • Fig. 1 shows a simplified plan view of a security and/or valuable document comprising a security element
  • Fig. 2 shows a background layer of the security element consisting of sequences of first lines of the background layer
  • Fig. 3 shows a shift of first geometric shapes of an embossed structure according to the invention
  • Fig. 4 shows a cross-sectional view of a part of a intaglio machine with different slope angles of the embossing elements sides;
  • Fig. 5 shows a diagram of creating a hidden picture of the security element according to the invention - the first embodiment of the invention
  • Fig. 6 shows a diagram of creating the security element according to a second embodiment of the invention.
  • Fig. 7 shows a cross-sectional view of the security element and of the background layer according to a second embodiment of the invention
  • Fig. 8 shows a cross-sectional view of the security element and its observation points according to a second embodiment of the invention
  • Fig. 9 shows a diagram of creating the security element according to a second embodiment of the invention in another variant
  • Fig. 10 shows a cross-sectional view of the security element and its observation points according to a second embodiment of the invention in another variant
  • Fig. 11 shows a cross-sectional view of the security element and of the background layer according to a third embodiment of the invention.
  • Fig. 12 shows a diagram of creating the security element according to a third embodiment of the invention.
  • Fig. 13 shows a diagram of creating the security element according to a fourth embodiment of the invention.
  • Fig. 14 shows a partial cross-sectional perspective view of the security element according to a fourth embodiment of the invention.
  • Fig. 15 shows a diagram of creating the security element according to a fifth embodiment of the invention.
  • the security element consists of background layer in a form of sequences of parallel first lines and of an embossed structure having such parameters that one obtains various colour effects of individual parts of a picture consisting of the security element.
  • the below described embodiments are not intended to limit the protection scope, but merely to illustrate one of many possible purposes of the present invention.
  • the present invention may be used in any field where one needs to produce a multicolour hidden picture with a clear colour division of individual parts of the picture, as well as to produce a multicolour hidden picture joined in a visual manner with a visible picture.
  • a security and/or valuable document, 100 has a form and format of a banknote, cheque, ticket, or another valuable document.
  • the security and/or valuable document, 100 shown in Fig. 1, comprises a substrate, 107, made, for example, from paper, polymer, like polypropylene (PP) and/or polyamide (PA), a combination of paper and polymer materials, and/or bound paper materials, paperlike materials, like teslin, or hybrid materials based on a combination of paper and polymer.
  • PP polypropylene
  • PA polyamide
  • the invention is not limited to any specific material.
  • the material of the substrate, 107 may have a multilayered structure comprising several mutually bonded layers.
  • the security element, 106 in a form of a hidden picture located on the security and/or valuable document, 100, is consisting of a layer consisting of the background, 108, shown in Fig. 2, superimposed onto the substrate, 107, and of a second layer, manufactured by the blind intaglio technique, shown in Fig. 3.
  • the term“applying” onto the substrate, 107 means offset printing, letterset printing, and the term“blind technique” means to perform the embossing without any ink on the substrate, 107.
  • the background or the background layer, 108 is an underprint made from a sequence of parallel first lines of a constant width n , and any number of colours L.
  • the sequence of the first lines results from the formula Ln.
  • the background layer, 108 may consist of a sequence of the first lines comprising a single coloured line of a width n, as well as it may be produced from a sequence of the first lines comprising two, three, or any number of mutually parallel lines of different colours L of the same width n.
  • the colour of the substrate, 107 becomes a second colour of the sequence of the first lines of a width n, i.e., of the same width that the first line, superimposed onto the substrate, 107, has.
  • the colour of the substrate, 107 may be utilised as another colour in a sequence of the first lines. If the sequence of the first lines will be composed of a first, 101, a second, 102, and a third colour, 103, then such sequence of the first lines is denoted by the symbol 3n.
  • the background layer, 108 may be constituted by at least one sequence of the first lines, as well as any arbitrary number of sequences of the first lines, and, preferably, the order of the colours in every sequence of the first lines is the same. It means that if the sequence of the first lines is defined by the first, 101, second, 102, and third, 103, colour, then any subsequent sequence of the first lines is created by the same colours arranged, one by one, in the same order, i.e., again the first, 101, second, 102, third colour, 103.
  • a parallel line of the third colour, 103, of the preceding sequence of the first lines adjoins with its edges with a parallel line of the first colour, 101, of a subsequent sequence of the first lines.
  • the first colour, 101 is Cyan
  • the second colour, 102 is Yellow
  • the third colour, 103 is Magenta.
  • a line, first line, line in a sequence of the first lines of the background layer, line of the background layer are used interchangeably.
  • the width n of a line in a sequence of the first lines may be different, however, it affects the readability of the hidden picture.
  • the width n is in the range from 100 to 400 micrometers, preferably from 120 to 250 micrometers, and most preferably 150 - 200 micrometers.
  • the readability of the hidden picture is more affected by the number of used colours L in a sequence of the first lines than by the width n of these lines.
  • the background is composed of, thereby the higher the number of parallel lines of the same colour, the narrower the individual sequences of the first lines become, and the parallel lines of the same colour in neighbouring sequences of the first lines become located more and more close to each other.
  • a sequence of the first lines may be imprinted with a colouf ink, such as an ink for offset printing, letterset printing, or flexographic printing.
  • an embossing process is performed of an embossed structure onto the homogeneous, striped background layer, 108, as described above.
  • the embossed structure is the second layer of the security element, 106, consisting of a designed hidden picture.
  • the layer is embossed using an intaglio machine and it is raised. It may present any complex picture showing a plant, an animal, or any other object or abstract graphics.
  • the embossed structure may be constituted by a grid of equidistant, relative to each other, first geometric shapes.
  • the first geometric shapes, within a single part of the hidden picture, are equidistant, when the lines going through the centres of these geometric shapes, drawn perpendicularly to the shift direction, are at the same distance within a single part of the hidden picture.
  • the peripheral geometric shapes of the hidden picture have a smaller width than the remaining geometric shapes of this hidden picture, and for such peripheral geometric shape the distance from the line going through the centre of this geometric shape to the line going through the centre of neighbouring geometric shape will be smaller than for non-peripheral geometric shapes within a single part of the hidden picture.
  • the first geometric shape it is meant, for example, rectangular, square, triangle, trapezium, circle, ellipse, diamond, as well as other shapes of complex structures (fractal structures), or lines.
  • a specific example of equal distances is parallelism.
  • the grid of the embossed structure is defined by equidistant, relative to each other, first geometric shapes, it is beneficial to produce them using semicircular engraving profile.
  • the engraving profile is symmetrical.
  • the solution is not limited to such profile but it may be used also with V-shaped or W-shaped profiles.
  • the first geometric shapes of the embossed structure do not adjoin each other directly, since are separated from each other by a value of the shift p (Fig. 3), that, depending on the embossed picture and an effect, that is to be achieved, is from 50 to 400 micrometers.
  • the only colour that is visible is the colour located on the sides and edges of the embossing.
  • a combination of two colours, 101 and 102 will be placed on a side or close to an edge, then a mixed colour will be perceived by an observer’s eyes.
  • a semicircular profile colours are mixed smoothly.
  • edges of the embossing it is meant a part from the half of a side of the embossed element to the half of the apex of the embossing.
  • the security element, 106 in a form of a multicolour hidden picture is obtained through embossing the first geometric shapes of the embossed structure of different elements and/or parts defining the hidden picture with a shift by an appropriate value of the shift p relative to the sequences of the first lines of the background layer, 108.
  • a value of the shift p may by defined by an integer or non- integer width of the first lines or their multiple, and, substantially, the width of a single first geometric shape should be in the range from 50% « to 150 %n, where n is the width of a single line in a sequence of the first lines.
  • a hidden picture is obtained by a shift of the first geometric shapes of an embossed structure relative to the sequences of the first lines, it means that the first geometric shapes of the embossed structure are embossed with a shift relative to the sequences of the first lines of the background layer.
  • first geometric shapes of the embossed structure are embossed with a shift relative to the sequences of the first lines of the background layer.
  • geometric shape and shape are used interchangeably to indicate a single first geometric shape of an embossed structure.
  • Other colours of other individual elements and/or parts of a hidden picture are obtained by embossing the first geometric shapes of the embossed structure of these other elements and/or parts, with a shift by an additional distance upwards or downwards relative to the first geometric shapes of an embossed structure of a previous element and/or part of the hidden picture, 105.
  • This additional distance is the width or a multiple of the width of a single first line in a sequence of the background layer, 108.
  • the first geometric shapes of an embossed structure are being shifted in parallel relative to the sequences of the first lines, however, also, it is possible to shift with a rotation by a predetermined angle.
  • the shift, by a value of the shift p, of an embossed structure relative to the sequences of the first lines by a distance even as small as of the order of 1/100 millimetre, causes a change of a tone of the later of hidden picture effect of the security element, 106.
  • the engraving depth for embossing the first geometric shapes is from 30 to 80 micrometers, preferably from 40 to 60 micrometers.
  • the width of the first geometric shapes of the embossed structure may be arbitrarily wider n+50%n or narrower n-50%n.
  • the width of a single shape of the first geometric shapes of the embossed structure depends on the number of colours L in a sequence of the first lines, and the width n of these lines, and on the colour effect that one assumes to obtain for the hidden picture of 106. The more different colours in a sequence of the first lines, the bigger the width of a single geometric shape of the first geometric shapes of the embossed structure may be. And reversely, the less different colours in a sequence of the first lines, the smaller the width of single geometric shape of the first geometric shapes of the embossed structure may be.
  • the width of a single geometric shape of the first geometric shapes of an embossed structure is from 50 to 600 micrometers, preferably from 150 to 250 micrometers. It turned out that in order to obtain a multicoloured hidden picture with a clear colour division of individual parts of the hidden picture, of importance is the slope angle a of the sides of the embossing elements (printing elements) at the base of the engraving shown in Fig. 4. Preferably, this angle is from 75° to 90°.
  • the first geometric shapes of the embossed structure have the same angle.
  • the background layer, 108 will be illuminated with side light, then a hidden picture will appear that will be visible even when observing it transversely, sidewise, or at any other position.
  • a security element, 106 in a form of a hidden picture, consists of a background layer, 108, superimposed onto a substrate, 107, of a security and/or valuable document, 100.
  • the background layer, 108 is defined by at least one sequence of parallel first lines consisting of at least two lines of different colours, and, moreover, the colour of the substrate, 107, may consist of one of the colours of the sequence of the first lines, and the lines in the sequence of the first lines have the same width.
  • the security element consists of at least one embossed structure, 104, on the background layer, 108, the embossed structure, 104, being defined by equidistant, relative to each other, first geometric shapes, and a hidden picture, 105, is obtained by embossing the first geometric shapes of the embossed structure, 104, with a shift relative to the sequences of the first lines of the background layer, 108.
  • a security element, 106 in a form of a hidden picture, 105, into many colouristically separate but, at the same time, clear parts 105a, 105b.
  • the background layer, 108, of the security element, 106 onto the substrate, 107, is imprinted, the layer comprising a lot of sequences of parallel first lines consisting of at least two lines of different colours, the background layer, 108, being consisted of of any arbitrary number of multiples of the sequences of the first lines.
  • the lines in a sequence are of the same width n.
  • an embossed structure, 104 is blind-embossed, consisting of raised equidistant, relative to each other, first geometric shapes that are created by a permanent deformation of the substrate, 107, whereby parts of the sequences of the first lines become accentuated.
  • the length of the first geometric shapes of the embossed structure, 104 depends on the desired effect.
  • Fig. 7 shows z cross-sectional view of the picture element, 105b, and of the background layer, 108, along the axis b -b.
  • another colour of a part in the hidden picture, 105 is obtained through embossing, with a shift by an additional distance, the first geometric shapes of the embossed structure, l04a, of the second element, l05a, relative to the first geometric shapes of the embossed structure, l04b, of the first element, l05b.
  • another colour is obtained, when the width of the first geometric shapes of the embossed structure is not bigger than n at a shift of the first geometric shapes of the embossed structure, l04a, of the second element, l05a, by the value of the shift p—n relative to the first geometric shapes of the embossed structure, l04b, of the first element, l05b.
  • the first geometric shapes of the embossed structure l04a, l04b, according to the present embodiment preferably are located within a single line of the background layer, 108.
  • the picture, 105 consists of, for example, two separate elements, this also being shown in Fig. 6, then the first geometric shapes of the embossed structure of both elements, l05a, l05b, are embossed with a shift by the value of the shift 3n relative to the sequences of the first lines, 108, but, additionally, the second graphical element, l05a, is shifted relative to the first graphical element, l05b, by additional line width n, such that both graphical elements obtain another colour. Also, depending on the desired sparkle effect, a shift by the line width n is performed upwards and/or downwards relative to the first graphical element, l05b.
  • a picture, 105 is obtained that, when observing at an acute angle in diffused light accentuates embossed elements in the first colour, 101, for the second graphical element, 105 a, and in the second colour, 102, for the first graphical element, l05b.
  • this principle is valid for a picture, 105, consisting of many elements, each of which being in another colour, as well as for pictures consisting of many sparkling parts.
  • embossing the first geometric shapes of the embossed structure, 104 with a shift by an integer multiple of the width of a single line in the sequence of the first lines, relative to the first part or graphical element, as well as subsequent parts or elements consisting of a portion of the hidden picture, multicolour pictures are produced with a clear colour division of individual parts of the picture, 105.
  • the width of a single first geometric shape may not be bigger than the width of a single line in a sequence of the first lines, and the geometric shapes are located within single lines of the background layer.
  • Fig. 10 shows a cross-sectional view of the graphical elements of Fig.
  • the first graphical element, l05b falls onto the junction between the second colour, 102, and the first colour, 101, then, when observing at an acute angle from the direction A, the picture, 105, will be visible, such that the second graphical element, 105 a, will be visible in the first colour, 101, whereas the first graphical element, l05b, will be visible in the second colour, 102, and from the direction B the second graphical element, l05a, will be visible in the third colour, 103, whereas the first graphical element, l05b will be visible in the first colour, 101.
  • a side light (D) will be placed at a level of the substrate, 107, the light being perpendicular to the first geometric shapes of the embossed structure, 104, then the whole sparkle effect of both graphical elements, l05a, 105b, is visible from the directions A, B, C, and from any other direction, and a colour will be visible from a given observation direction.
  • the invention may consist of a plurality of graphical elements in many colours consisting of a hidden picture of the security element, 106, accordant with the present embodiment.
  • the purpose of the third embodiment is to obtain multicoloured smooth colour transitions in a picture, 205, of the security element, 106, creating a rainbow impression.
  • rainbow it is meant a uniform transition, over some surface, from one colour to second colour, or from one fade of the same colour to its another fade.
  • the rainbow impression within its classical meaning, is possible to obtain, if the background layer, 108, is created by sequences of first lines at least in colour Magenta, Yellow, and Cyan.
  • Pantone colours for example red, velvet, brown
  • no rainbow will be obtained in the classical sense, but a uniform transition from one colours with its tones to another colour with its tones.
  • the background layer, 108, of the security element, 106 consistis of at least three sequences of parallel first lines of at least two colours, wherein the colour of one of the first lines in a sequence may be the colour of the substrate, 107.
  • the background layer, 108 consists of any number of sequences of the first lines of the same width n.
  • the width of the first geometric shapes of the embossed structure, 204 depends on the effect, that is to be obtained, and it is in the range from n-50%n to n+50%n
  • L denotes the number of different colours in a sequence of the first lines
  • n denotes the width of a single line in a sequence of the first lines
  • the first geometric shapes of the embossed structure, 204 are embossed with a parallel shift relative to the background layer, 108, however, it is also possible to make the embossing with a parallel shift with a turn by a predetermined angle.
  • a value of the shift p is calculated by adding the coefficient w to the Ln value, or by subtracting it.
  • the coefficient w is subtracted from the Ln value, an effect of colour transition is obtained, the transition being inverted by 180°.
  • the rate of the colour transitions depends on the number of sequences, the graphical element of the picture, 205, is located, this being illustrated by the following two calculation examples a and b.
  • the embossed structure, 204 is adjusted such that to obtain desired colours of the security element, 106.
  • the tone of the colour obtained in the embossing depends on the overlapping extent of two neighbouring colours onto this embossing.
  • the overlapping extent denotes mixing two neighbouring colours, in different ratios, on the side profiles of an embossed structure, 204. This is shown in Fig. 11.
  • the mixing ratios of colours on the profiles of the embossed structure, 204 are arbitrary.
  • the colour transition between the colours of the sequences of the first lines may be repeated many times in the area of the graphical element of the picture, 205.
  • the coefficient w that is responsible for a single colour transition, is multiplied by a value of z-1.
  • the coefficient w is responsible for a single transition between the used colours. For example, when placing five colour transitions in the picture, 205, the coefficient w is multiplied by z - 1, i.e., 4.
  • Fig. 12 shows a preferable embodiment, in which the background layer, 108, of the security element, 106, in a form of a hidden picture, 205, consists of 6 sequences of parallel lines of three colours of the same width n, wherein a colour of a single line in a sequence of the first lines may be the colour of the substrate, 107. Then, an embossed structure, 204 was blind-embossed on the background layer, 108. A multicoloured picture, 205, is obtained by shifting the first geometric shapes of the embossed structure, 204, by a value of the shift p, where
  • Ln denotes the number of colour lines in a sequence of the first lines
  • the first colour, 101 is colour Cyan
  • the second colour 102 is Yellow
  • the third colour, 103 is Magenta
  • by making the first geometric shapes of the embossed structure, 204, with the value of the shift p 2,5n, one obtains a transition: Cyan - velvet - Magenta - orange - Yellow- green - Cyan.
  • the size of the embossed structure, 204 may be bigger than the structure of the first lines, and it may be embossed beyond the area of the background layer, 108. Then, the security element, 106, has a hidden picture over the whole surface of the imprinted background, 108, and the embossing outside the structure of the first lines is not visible, i.e., it gives no hidden picture. In this way, a risk is reduced of misalignment of the embossed structure, 204, with the background layer, 108.
  • each of the Examples 1 to 5 may be supplemented by embossing outside the structure of the first lines, as described above.
  • a multicoloured security element, 106 in a form of a hidden picture, 305, shows the moire effect.
  • the background layer, 108 as described above, is blind-embossed with an embossed structure, 304, consisting of raised first geometric shapes, parallel relative to each other, wherein they are turned from the sequences of the first lines, 108, by a predetermined angle.
  • the width of the first geometric shapes of the embossed structure, 304 may be arbitrarily wider n+50%n or narrower n-50%n.
  • the security element, 106 created by the superimposed first geometric shapes of the embossed structure, 304, on the background layer, 108, consisting of at least two sequences of the first lines of three different colours, observed in diffused light when observing perpendicularly to the surface or when observing in parallel to the lines, has a uniform colour.
  • the security element, 106 is viewed at an acute angle, then one can observe the moire effect.
  • This effect arises due to the fact that on every single geometric shape of the embossed structure, 304, a sequence of one-by-one colours 101, 102, 103, is located, sometimes many times, instead of the single colour of the background layer, 108.
  • the embossed structure, 304 by a predetermined angle relative to the sequences of the first lines of the background layer, 108, causes a transition of the picture, 305, in the security element, 106, of a uniform colour into a multicoloured picture having colours changing from the first colour, 101, into the second colour, 102, and then into the third colour, 103.
  • the colour transition takes place in a diffused/meshing manner from one colour into another, by creating, for example, linear stripes of different colours created by mixing three primary colours of the background layer, 108, and their intermediate tones.
  • the first geometric shapes of the embossed structure, 304, according to the invention may create any arbitrary shape, from simple ones up to very complex patterns presenting leafs, butterflies, drops, or other motifs.
  • the predetermined angle is from 1° to 12°, preferably the angle is from 3° to 6°. Turning the first geometric shapes of the embossed structure, 304, by a higher angle relative to the background layer, 108, increases the moire effect.
  • Fig. 13 shows a security element, 106, in a form of a hidden picture, 305, produced according to this embodiment.
  • the colour of the substrate, 107 may constitute one of the colours in a sequence of the first lines 3n.
  • the lines are of the same width n.
  • a picture, 305, of the security element, 106 is created by blind embossing, within the background layer, 108, first geometric shapes of an embossed structure, 304, that are shifted, relative to the sequences of the first lines of the background layer, 108, by a value of the shift p, and are turned relative to the sequences of the first lines, by an angle of 6°.
  • the first geometric shapes of the embossed structure, 304, along with the background layer, 108 may define any arbitrary pattern.
  • a plurality of subsequent colours may be located on a single shape, sometimes many times.
  • the security element, 106 shows an example of the security element, 106, with three repeating lines of different colours within a single geometric shape of the embossed structure, 304.
  • the moire effect may be obtained both by turning, by a predetermined angle, the embossed structure, 104, shown in the first embodiment as well as the embossed structure, 204, of the second embodiment.
  • the security element, 106 may consist of a plurality of different parts, of which, in every single part, its first geometric shapes of the embossing the embossed structure, are differently, relative to each other, turned and shifted.
  • the first geometric shapes of embossed structure, 104, 204, 304 are turned by a predetermined angle clockwise or anticlockwise.
  • the hidden picture, 105, of the first embodiment may consist of three parts, of which the upper part of the hidden picture, 105, is turned, for example, by an angle of 6°, the lower part of the picture, 105, is turned by an angle of - 6°, and the central part is shifted by the line width n and is turned by 6°.
  • the fifth embodiment is the security element, 106, shown in Fig. 15.
  • the security element, 106 in a form of a hidden picture, on a security and/or valuable document, 100, consists of a layer consisting of the background, 108, the layer being superimposed onto the substrate, 107, and of at least one embossed structure, 404, that consists of equidistant, relative to each other, first geometric shapes, a hidden picture, 405, being obtained by embossing the first geometric shapes of the embossed structure with a shift relative to the sequences of the first lines of the background layer, 108.
  • the security element, 106 also has at least one inked embossed structure, XXX, consisting of equidistant, relative to each other, second geometric shapes embossed and covered with an ink on the background layer, 108.
  • XXX inked embossed structure
  • the security element, 106 in addition to the hidden picture, 405, also contains a visible picture, XXX', obtained by embossing second geometric shapes of inked embossed structure, XXX, with a shift relative to the sequences of the first lines of the background layer, 108.
  • Th visible picture, XXX’ may be any arbitrary picture, however, preferably the visible picture is a complement of the hidden picture, its repetition, or its mirror image.
  • the inked embossed structure XXX may be constituted by a grid of equidistant, relative to each other, second geometric shapes.
  • the second geometric shapes within a single part of the visible picture, are equidistant, when the lines going through the centres of these geometric shapes, drawn perpendicularly to the shift direction, are at the same distance within a single part of the visible picture.
  • peripheral geometric shapes of the picture have a smaller width than the remaining geometric shapes of this picture, and for such peripheral geometric shapes the distance from the line going through the centre of this geometric shape to the line going through the centre of a neighbouring geometric shape will be smaller than for non-peripheral geometric shapes within the single part of the picture.
  • second geometric shape it is meant, for example, a rectangle, square, triangle, trapezium, circle, ellipse, diamond, as well as other shapes of complex structures (fractal structures), or lines.
  • fractal structures complex structures
  • a specific example of equal distances is parallelism.
  • the inked embossed structure XXX may be a grid of squares of a side depending on the desired effect.
  • the width of the second geometric shapes of the structure is in the range from n to Ln-1. It means that the first geometric shapes of the embossed structure, 404, and the second geometric shapes of the structure may have the same width, but also may have different widths.
  • the square side width is 2n and the shift is 3n. If the goal is to cover one colour out of a four-coloured background layer, 108, then the square side is n and the shift is 4n.
  • Fig. 15 shows an embodiment in which both a hidden picture, 405, and a visible picture, XXX’ co-exist within the security element, 106.
  • the background layer, 108 consists of 6 sequences of parallel lines of three colours: a first one, 101, a second one, 102, and a third one, 103, of the same line width n.
  • an embossed structure, 404 was blind-embossed on the background layer, 108, the structure 404 having a form of a grid of squares of a side width n, with a parallel shift by 3n relative to the sequences of the first lines of the background layer, 108, and, in the same run, a inked embossed structure, XXX, was wet-embossed, having a form of a grid of squares of a side width 2 n, with a parallel shift by 3n relative to the sequences of the first lines of the background layer, 108.
  • the inked embossed structure, XXX covers, with the used ink, two colours of the background layer, 108, i.e., the first colour, 101, and the second colour, 102, and only one colour is visible - the colour third, 103, in a darker or brighter tone depending on the colour of the ink used for inking the inked embossed structure, XXX.
  • the visible picture, XXX’ is a picture of any arbitrary shape resulting from combining the ink covering the first colour, 101, and the second colour, 102, and visible elements of the third colour, 103.
  • the same third colour, 103 is on the blind-embossed structure consisting of the hidden picture, 405.
  • the first geometric shapes of the embossed structure, 404, as well as the second geometric shapes of the inked embossed structure, XXX may be arbitrarily shifted according to the second embodiment, as well as may be shifted with a turn by a predetermined angle, this being described in detail in the fourth embodiment.
  • each of the Examples from 1 to 4 may be completed by a visible picture, XXX’, produced in the manner as described in the fifth embodiment.
  • the visible picture is not limited to a grid of squares, but it may be based on any equidistant geometric shape.
  • the security element may consist of a plurality of embossed structures and of a plurality of inked embossed structures.
  • the invention relates to a method for manufacturing a security element, 106, in a form of a hidden picture, on a security and/or valuable document, 100.
  • a background layer, 108 is applied, consisting of at least one sequences of parallel first lines comprising at least two lines of different colours.
  • the colour of the substrate, 107 may be one of the colours of the sequences of the first lines of the background layer, 108, and the lines in the sequence of the first lines have the same width n.
  • the sequence of the parallel first lines are produced by offset printing, letterset printing, or flexographic printing.
  • the sequence of the first lines consists of three different colours, a first one, 101, a second one, 102, and a third one, 103.
  • these are colours from the CMY palette or the PANTONE system.
  • 106 is applied, comprising a designed hidden picture.
  • This layer is embossed using an intaglio machine.
  • a plate for intaglio printing is used.
  • the picture in the intaglio plate may be etched, light-exposed and washed out, engraved, or laser fired.
  • a designed picture creates an embossed structure, 104, 204, 304, 404.
  • the picture creates an embossed structure 104, 204, 304, 404 and a inked embossed structure XXX.
  • the embossed structure 104, 204, 304, 404, and/or the inked embossed structure XXX may consist of a grid of equidistant, relative to each other, geometric shapes. Under the term of the grid of geometric shapes it is meant a grid of circles, squares, diamonds, ellipses, rectangles, triangles, etc. Also, the shapes may be segments of straight or curved lines.
  • the form of the first geometric shapes of the embossed structure, 104, 204, 304, 404, as well as of the second geometric shapes of the inked embossed structure, XXX, depends on the desired hidden and visible pictures.
  • a single shape of the first geometric shapes of the embossed structure, 104, 204, 304, 404 has a width in the range from n-50%n to n+50%n.
  • a single shape of the second geometric shapes of the inked embossed structure, XXX has a width in the range from n to Ln-1.
  • the first geometric shapes of the embossed structure, 104, 204, 404, and/or the second geometric shapes of the inked embossed structure, XXX are embossed with a parallel shift relative to the sequences of the first lines of the background layer, 108, depending on the desired effect.
  • L denotes the number of different colours in the sequence of the first lines
  • n denotes the width of a single line in the sequence of the first lines
  • i s denotes the number of the sequences of the first lines in the area of the embossed structure.
  • a value of the shift p may be an integer or non-integer multiple of the width of the first lines, wherein the width of a single first geometric shape of the embossed structure should be in the range from 50% « to 150 %n.
  • the embossing of the embossed structure 104, 204, 304, 404, in a form of a designed picture may be performed using an intaglio technique.
  • the embossing of the embossed structure, 104, 204, 304, 404, is performed by blind embossing, whereas the embossing of the inked embossed structure, XXX, is performed in a wet process using at least one intaglio ink.
  • the security element, 106 consists of a hidden, 405, and visible XXX’ pictures
  • the security element, 106 in the same run, when blind embossing the embossed structure, 404, with a shift relative to the sequences of the first lines of the background layer, 108, by a predetermined value of the shift p, also inking is performed of the inked embossed structure, XXX.
  • Individual colours are applied onto a mould for wet embossing by means of special patterns for applying intaglio ink (or inks). Every colour has its separate pattern and may comprise another shape, therefore the second geometric shapes of the structure may be inked in different colours by appropriate shapes on different patterns.
  • the structure is produced by wet embossing on the background layer, 108, i.e., using at least one intaglio ink, the ink being applied onto the coloured lines of the background layer, 108.
  • the grid of the elements of the embossed structure with the inked, XXX, and non inked, 404, areas, is shifted in parallel.
  • the inked embossed structure, XXX may have a form of a grid of shapes, the form of the shapes depending on the desired effect. For example, if the grid of the second geometric shapes is a grid of squares, then, if two colours are covered out of a three- colour background layer, 108, then the side width is 2n and the shift is 3n. If one colour is covered out of a four-colour background layer, 108, then the square side is n and the shift is 4n. Then, when observing perpendicularly, colours of the background layer, 108, are visible that are not covered by the ink, along with the visible picture, XXX’.
  • a second effect appears in a form of those elements of the first geometric shapes of the embossed structure, 404, that consist of the hidden picture, 405, and the complement of which is the visible picture, XXX’.
  • a value of the shift p is calculated by adding or subtracting the coefficient w to/from the Ln value.
  • the coefficient w is responsible for a single transition between the used colours. A colour transition between colours of sequences of the first lines may occur repeatedly in an area of the graphical element of the hidden picture.
  • the coefficient w is multiplied by a value of z-1.
  • a value of the shift p is calculated for the first geometric shapes of the embossed structure relative to the first lines of the background layer, 108. The problem of the colour transitions in the hidden picture has been discussed in detail above.
  • the inked embossed structure, XXX consists of a grid of squares, rectangles, oval or circular elements, and if one desires to obtain a colour transition of both pictures, the visible one XXX' and the hidden one 405, then a value of the shift p for the inked part is the same as for the blind embossing.
  • the first geometric shapes of the embossed structure, 104, 204, 304 are turned by a predetermined angle clockwise or anticlockwise.
  • the predetermined angle is from 1° to 12°, preferably is 6°.
  • the second element and/or part, l05a, of the hidden picture, 105, of another colour is obtained by shifting the first geometric shapes of the embossed structure, 104a, of the second element and/or part, l05a, of the hidden picture, 105, by an additional distance upwards and/or downwards relative to the first geometric shapes of the embossed structure, 104b, of the first element and/or part, l05b, of the hidden picture, 105.
  • This additional distance is equal to an integer multiple of the width of the first lines, i.e., for example, it is equal to n, but the width of a single geometric shape of the first geometric shapes may not be bigger than n.
  • the invention relates to a security and/or valuable document, 100, consisting of a security element, 106, as described above.
  • any combination of the above described individual features may be used to obtain the security element, 106.

Landscapes

  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un élément de sécurité à image cachée, un document de sécurité, constitué de l'élément de sécurité, et un procédé de fabrication d'un tel élément de sécurité, l'élément de sécurité étant constitué d'une couche d'arrière-plan sous la forme de séquences de premières lignes parallèles, et d'une structure gaufrée ayant des paramètres tels que différents effets colorants, pour des parties individuelles de l'image constituant l'élément de sécurité, sont obtenus.
EP18836936.7A 2017-11-30 2018-11-30 Élément de sécurité à image cachée, document de sécurité et procédé de fabrication d'un élément de sécurité Pending EP3717271A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PL423662A PL234566B1 (pl) 2017-11-30 2017-11-30 Element zabezpieczający z obrazem ukrytym, dokument zabezpieczony oraz sposób wytwarzania elementu zabezpieczającego
PCT/PL2018/050061 WO2019108077A1 (fr) 2017-11-30 2018-11-30 Élément de sécurité à image cachée, document de sécurité et procédé de fabrication d'un élément de sécurité

Publications (1)

Publication Number Publication Date
EP3717271A1 true EP3717271A1 (fr) 2020-10-07

Family

ID=65139075

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18836936.7A Pending EP3717271A1 (fr) 2017-11-30 2018-11-30 Élément de sécurité à image cachée, document de sécurité et procédé de fabrication d'un élément de sécurité

Country Status (3)

Country Link
EP (1) EP3717271A1 (fr)
PL (1) PL234566B1 (fr)
WO (1) WO2019108077A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2615401B2 (ja) * 1992-06-04 1997-05-28 大蔵省印刷局長 偽造防止用潜像模様形成体及びその作製方法
WO2009139396A1 (fr) * 2008-05-01 2009-11-19 独立行政法人 国立印刷局 Matériau de formation d’image, dispositif de détermination d’authenticité et procédé de détermination d’authenticité
RU2440248C1 (ru) * 2010-08-03 2012-01-20 Федеральное Государственное Унитарное Предприятие "Гознак" (Фгуп "Гознак") Носитель информации с оптически переменной структурой (варианты)
GB201212046D0 (en) * 2012-07-06 2012-08-22 Rue De Int Ltd Security devices
JP6394984B2 (ja) * 2015-06-02 2018-09-26 独立行政法人 国立印刷局 潜像印刷物
GB2550168B (en) * 2016-05-11 2018-07-25 De La Rue Int Ltd Security device and method of manufacture

Also Published As

Publication number Publication date
PL234566B1 (pl) 2020-03-31
PL423662A1 (pl) 2019-06-03
WO2019108077A1 (fr) 2019-06-06

Similar Documents

Publication Publication Date Title
CN101421118B (zh) 具有光学可变结构和涂层的防伪元件及其制造方法
CA2738992C (fr) Imprime empechant la contrefacon
EP2727741B1 (fr) Document précieux à structure optiquement variable (et variantes)
CN104968504A (zh) 光学可变表面图案
AU2014266828B2 (en) Printed security feature, object comprising such a printed security feature, and process of producing the same
JP5721102B2 (ja) 複写防止印刷物
JP6948030B2 (ja) 色彩変化印刷物
CA2867336A1 (fr) Dispositif optique a images multiples
JP2018024105A (ja) 潜像印刷物
JP5885164B2 (ja) 潜像印刷物
JP5533731B2 (ja) 潜像印刷物
CN110418721B (zh) 具有结构元件的产品或者产品包装
JP2013123850A (ja) 色彩可変模様を有する印刷物
JP5907382B2 (ja) 潜像印刷物
EP3717271A1 (fr) Élément de sécurité à image cachée, document de sécurité et procédé de fabrication d'un élément de sécurité
JP7185876B2 (ja) 潜像印刷物
CN114161856A (zh) 一种通过逆向uv工艺制备多角度观测变色的隐藏图像方法
JP2014140984A (ja) 特殊潜像画像形成体
JP5920784B2 (ja) 潜像印刷物
JP5597874B2 (ja) 潜像印刷物
JP2016107467A (ja) 色彩変化印刷物
CN113383252B (zh) 用于显示多颜色的衍射图像的栅格结构图像
JP7329800B2 (ja) 潜像印刷物
GB2605869A (en) Security devices and methods of manufacture thereof
AU2014203192B2 (en) Forgery preventive printed matter

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20200628

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20210908