EP2798396B1 - Verfahren zur herstellung einer sicherheitsvorrichtung - Google Patents

Verfahren zur herstellung einer sicherheitsvorrichtung Download PDF

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Publication number
EP2798396B1
EP2798396B1 EP12816763.2A EP12816763A EP2798396B1 EP 2798396 B1 EP2798396 B1 EP 2798396B1 EP 12816763 A EP12816763 A EP 12816763A EP 2798396 B1 EP2798396 B1 EP 2798396B1
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EP
European Patent Office
Prior art keywords
pattern
vision
axis
lenticular network
angle
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EP12816763.2A
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English (en)
French (fr)
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EP2798396A1 (de
Inventor
Rémy ALBAN
Guilhem GIRAUDET DE BOUDEMANGE
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Idemia France SAS
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Idemia France SAS
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Publication of EP2798396A1 publication Critical patent/EP2798396A1/de
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    • 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
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/148—Transitory images, i.e. images only visible from certain viewing angles
    • 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
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/21—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose for multiple purposes
    • 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
    • B42D2035/20—
    • B42D2035/44—

Definitions

  • the present invention relates to a method of manufacturing a security device based on a display of multiple patterns through a lenticular network.
  • Such a security device is typically intended to be affixed to a support, such as an identity document, in order to authenticate it.
  • a difficult to reproduce security device is sought in order to make it difficult to manufacture or reproduce such a device.
  • such a security device is advantageously customizable in order to make it unique.
  • a lenticular network also called lenticular sheet, is composed of elementary lenses with the same optical characteristics, the lenticles, which have the particularity of having a focal length such that the rear face, the smooth face, of the lenticular network is confused with the plane. focal lens.
  • Each lenticle magnifies, in an image located under the lenticular network, an elementary zone which is located in alignment with the eye and the optical center of the lenticle.
  • a first embodiment which is called “pre-printed” allows, by having a specially adapted image under a lenticular network, to view different patterns, each pattern being visible individually along a specific viewing axis. It is thus possible to produce a composite image, adapted to the lenticular network under which it is arranged, comprising n patterns. Each such pattern is visible along an axis of vision specific to the pattern. We pass from an axis of vision to another neighboring axis of vision by a rotation according to a "Angular pitch" characteristic of the lenticular network. Such a suitable image is typically produced separately, taking account of said “angular pitch” and then being assembled with the lenticular network.
  • a second embodiment which is called “post-engraved”, it is still possible to produce a pattern, by etching in a layer.
  • Said layer is predisposed under a lenticular network and can be modified remotely through the lenticular network.
  • the etching is typically carried out by means of a beam, such as a laser beam, through said lenticular network.
  • Said beam modifies said layer by supplying energy.
  • Said beam is oriented, relative to the device, along a main axis which determines an axis of vision along which said pattern thus engraved is then visible. It is also possible by modifying the relative orientation between the device and the engraving tool, between two successive engravings, to produce multiple patterns.
  • the engraved patterns will be distinct and visible separately, each according to its own line of vision, without interference between the patterns. Due to the principle of modification, engraving only allows for monochrome patterns.
  • pre-printed and post-engraved make it possible to produce fairly similar devices, in that they comprise n separate patterns, each visible along an axis of vision specific to the pattern. We pass from one axis of vision of a pattern to another by a rotation of the device respecting the "angular step” or at an angle multiple of the "angular step” characteristic of the lenticular network.
  • Each embodiment used alone offers, by its intrinsic complexity of implementation, relative protection against unauthorized reproduction.
  • the “angular step” is intrinsically respected during the production of the image, which incorporates this “angular step”.
  • the “angular step” is respected by a change of relative orientation of the etching axis, between two engravings of successive patterns, according to a rotation respecting the “angular step”.
  • Respect for the “angular pitch” is here achieved in relation to the viewing / engraving axis of the first pattern.
  • the present invention provides a manufacturing process which ingeniously and non-obviously combines the two previously described embodiments "pre-printed” and "post-engraved”. This combination, by integrating in the etching of a second pattern own characteristics resulting from the production of a first printed pattern is moreover highly synergistic.
  • a security device comprising at least a first pattern visible through a lenticular network along a first associated axis of vision and at least a second pattern visible through said lenticular network along a second associated axis of vision, each second axis of vision being oriented relative to at least a first vision axis according to a “angular pitch” characteristic of the lenticular network, said at least one second pattern being a function of at least one angle of a first vision axis relative to a normal to the device.
  • the second pattern is a function of at least one position of the first pattern relative to the device.
  • the second pattern is deformed by application of a transformation which is a function of at least one angle of the first axis of vision.
  • said transformation is such that it corrects on said at least one second pattern the effect produced by a rotation orienting the second axis of vision according to the normal, so that said at least one second pattern does not appear deformed when viewed along the second line of vision.
  • the device is planar and said transformation is an application of a multiplying coefficient to the dimension of the second pattern perpendicular to an axis of a rotation orienting the second axis of vision according to the normal, said ratio being equal to the cosine the angle of the second axis of vision relative to normal.
  • a second pattern as seen along a second associated vision axis, is complementary to a first pattern, as seen along a first associated vision axis.
  • the lenticular network is cylindrical along an axis of extension.
  • the invention relates here to a method of manufacturing a security device comprising the following steps: printing at least one first pattern capable of being seen through a lenticular network, assembling said printed pattern under said lenticular network, determining of a first axis of vision along which a first pattern is visible, rotation of the device according to an "angular pitch" characteristic of the lenticular network in order to present the device along a second axis of vision, production of a second pattern along the second axis vision through the lenticular network.
  • the method also comprises, prior to the production step, a step of construction of the second pattern so that its content is a function of the angle of the first line of vision relative to a normal to the device.
  • the method also comprises, prior to the production step, a step of construction of the second pattern so that its content is a function of the position of a first pattern relative to the device.
  • the construction step is such that the second pattern has complementarity with the first pattern.
  • the assembly step comprises adding a layer of modifiable material
  • the step of producing the second pattern comprises etching in said layer of modifiable material by means of a beam , through the lenticular network.
  • a lenticular network 2 comprises a periodic succession of lenticles 3, each having a substantially semicircular profile.
  • a first type is a cylindrical lenticular network 2.
  • each lenticle 3 has a substantially semi-cylindrical profile.
  • the cylindrical lenticles 3 are parallel to each other.
  • Each lenticle 3 magnifies an elementary zone in the form of a band of width corresponding to the width of a lenticle 3, of an image situated under the lenticular network 2.
  • Another type of lenticular network is obtained by crossing in the same plane two such cylindrical lenticular networks.
  • the lenticles 3 are substantially cubic with four rounded upper edges.
  • Such a lenticle 3 has a square shape in the plane of the lenticular network 2 and a semicircular shape in the two perpendicular planes passing respectively through the two axes of the cylinders.
  • the lenticles 3 are organized according to a square matrix.
  • Each lenticle 3 enlarges an elementary area or pixel in the form of a square with two sides / square cross with two branches, the two widths of the sides / branches of which correspond to the width of a lenticle 3, of an image situated under the lenticular network 2 .
  • another type of lenticular network 2 is obtained by crossing in the same plane of n such cylindrical lenticular networks 2.
  • the lenticles 3 are substantially polygonal with 2n sides with 2n rounded upper edges.
  • Such a lenticle 3 has a polygonal shape with 2n sides in the plane of the lenticular network 2 and a semicircular shape in the n perpendicular planes passing respectively through the n axes of the cylinders.
  • the lenticles 3 are organized according to a matrix.
  • Each lenticle 3 magnifies an elementary area or pixel in the form of a polygon with 2n sides / cross with 2n branches, the widths of the 2n sides / branches of which correspond to the width of a lenticle 3, of an image situated under the lenticular network 2.
  • a spherical lenticular network 2 is obtained.
  • the lenticles 3 are substantially hemispherical.
  • Such a lenticle 3 has a circular shape in the plane of the lenticular network 2 and a semicircular shape in any plane perpendicular to the plane of the lenticular network 2.
  • the lenticles 3 are typically organized according to a square (checkerboard) or hexagonal (honeycomb) matrix. 'bee).
  • Each lenticle 3 magnifies an elementary area or pixel in the shape of a circle with a diameter corresponding to the width / diameter of a lenticle 3, of an image situated under the lenticular network 2.
  • the invention is applicable to any type of lenticular network 2.
  • the figure 1 unidimensional, is thus applicable to all types of lenticular network 2. It shows a section along a plane normal to the surface of the lenticular network 2. In the case of a cylindrical lenticular network 2, the section is perpendicular to an axis ⁇ extension cylinders.
  • This image layer 4, 5 is periodically divided into sections 10, each section 10 corresponding to a lenticle 3 and is substantially opposite a lenticle 3.
  • Each section 10 includes segments 6-9 of patterns A, B.
  • the figure 1 illustrates an example with two patterns A, B, but it is possible to have more patterns.
  • an observer sees the segments 6 or 8 of a first pattern A when looking along a first axis of vision ⁇ . From all the segments 6 or 8 of all the sections 10 of a device 1, the eye reconstructs the first pattern A. Similarly, an observer sees the segments 7 or 9 of a second pattern B when he looks along a second axis of vision ⁇ . From all the segments 7 or 9 of all the sections 10 of a device 1, the eye reconstructs the second pattern B.
  • an angle p. ⁇ multiple of an “angular step” ⁇ between the orientation ⁇ of the first axis of vision ⁇ must be respected and the orientation ⁇ of the second axis of vision ⁇ .
  • a first “pre-printed” embodiment consists in placing a specially adapted image layer 5 under a lenticular array 2. Such an image layer 5 is broken down into segments 8 corresponding to a first pattern A and into segments 9 corresponding to a second reason B.
  • the content of segments 8, 9 depends on the respective content of different patterns A, B.
  • the location of the segments 8, 9 depends on the characteristics of the lenticular network 2. Thus the segments 8, 9 must be located in the sections 10.
  • the periodicity of the segments 8, 9 must respect the periodicity of the lenticles 3 of the lenticular network 2.
  • compliance with the “angular pitch” ⁇ characteristic of the lenticular network 2 is obtained by correct spacing of the segments 8 of a first pattern A relative to the segments 9 of a second pattern B.
  • an image comprising the different patterns is typically produced by printing, for example offset.
  • Such an embodiment thus advantageously makes it possible to produce one or more patterns A, B in color.
  • the printing of this image can be carried out on an image layer 5, then assembled with / under the lenticular network 2.
  • the printing of this image can be directly carried out on the reverse plane of the lenticular network 2, which makes then function of image layer 5.
  • a lenticular network 2 typically has a period / section width 10 of between 30 ⁇ m and 1 mm , preferably between 60 and 150 ⁇ m. It results from inaccuracies in positioning the image layer 5 relative to the lenticular network 2, during the step of assembling an image layer 5 printed under a lenticular network 2, or inaccuracies in setting the print relative to the network lenticular 2, during the direct printing step under the lenticular network 2, an inevitable uncertainty relative positioning between the image and the lenticular network 2.
  • the angle ⁇ of a first viewing axis ⁇ of a first printed pattern A is indeterminate and cannot be known in advance.
  • the angle ⁇ results from the manufacturing process and can only be known after assembly / printing of the image layer 5 and of the lenticular network 2. It is the same for the angle ⁇ of a second axis of vision ⁇ d 'a second pattern B printed.
  • a second “post-etched” embodiment uses a modifiable layer 4.
  • a modifiable layer 4 is assembled under the lenticular network 2.
  • An etching is then carried out, typically by means of a beam, such as a laser beam, through said lenticular network 2.
  • This etching is thus advantageously carried out remotely and further a posteriori, after assembling the lenticular network 2 and the different layers 4, 5.
  • This etching by varying the position and intensity of the beam, comes by energy input, modify said modifiable layer 4 and produce by etching at at least one motif A, B by engraving the corresponding segments 6 and / or 7.
  • a lenticle 3 is here used optically according to an optical path opposite to that of vision.
  • a path is symmetrical and by orienting the beam, relative to the device 1, along a main axis during the etching of a pattern A, respectively B, this main etching axis determines an axis of vision ⁇ , respectively ⁇ , along which said pattern A, respectively B, thus etched is then visible.
  • a pattern A, respectively a pattern B, visible from an axis of vision ⁇ , respectively ⁇ must be engraved by orienting the engraving beam along said axis of vision ⁇ , respectively ⁇ .
  • etching only allows monochrome patterns to be produced.
  • the etching beam burns a layer 4, for example of transparent polycarbonate, enriched in carbon. This burn reveals carbon black.
  • a white substrate or lower layer 11 provides a contrasting screen. A modulation of the beam power makes it possible to achieve a wide variety of gray levels.
  • Respect for the relative "angular step” ⁇ is obtained here by a change in orientation of an angle p. ⁇ multiple of the "angular step” ⁇ , between a first etching angle ⁇ of a first pattern A, known because chosen arbitrarily for engraving a first pattern A and a second engraving angle ⁇ , of a second pattern B.
  • This difficulty is taken advantage of in that it makes series production of a safety device 1 complex.
  • the circumvention of this difficulty implies, according to the invention, a step of individual recovery and precision metrology of each device 1, which makes it very complex to reproduce the manufacturing process and therefore the device 1.
  • a security device is manufactured according to a method illustrated in the figure 2 and comprising the following steps.
  • a first step consists in printing E1 at least a first pattern A on an image layer 5, so that it is visible through a lenticular network 2.
  • said at least one first pattern A is produced according to the first “pre-printed” embodiment previously described by prior printing followed by assembly under the lenticular network 2.
  • the fact that said at least one pattern A is visible through a lenticular network 2 implies that its printing is segmented in segments 8, 9 respecting an “angular step” ⁇ of said lenticular network 2.
  • This “angular step” ⁇ at the level of printing E1, results in the respect of a spatial period in the image thus printed.
  • the image layer 5 is printed by respecting parallel strips of width equal to the period 10 of the lenticular network 2.
  • Each such strip is divided into n sub disjoint parallel bands, where n is the total number, printed and / or engraved with desired patterns in the end.
  • These patterns are distributed in patterns printed in an image layer 5 during step E1 and in patterns etched in an modifiable layer 4 during a step E6 described later.
  • the image layer 5 is printed respecting a checkerboard / matrix corresponding to the checkerboard / matrix of arrangement of the lenticles 3.
  • said at least one first pattern A is assembled E2 under said lenticular network 2.
  • the two preceding stages of printing E1 and of assembly E2 are distinct when the printing E1 is carried out on an image layer 5, assembled then under the lenticular array 2.
  • the two preceding steps of printing E1 and assembling E2 are, on the contrary, confused when the printing E1 is carried out directly on the back, on the smooth face, of the lenticular array 2.
  • the assembly step E2 introduces uncertainty about the orientation of the axis (or of the axes if the patterns A printed are multiple) of vision ⁇ under which the pattern A is visible.
  • step E6 of etching another pattern B it is appropriate to determine E3 precisely the viewing axis ⁇ of at least one pattern A.
  • the determination step E3 can therefore only be carried out for one of these patterns A , the axis of vision ⁇ of any other reasons Printed deducting it by application of a rotation of angle p. ⁇ multiple of the “angular step”, function of the characteristics of the lenticular network 2. Also the step of determination E3 is described here only for a first motif A.
  • the axis of vision ⁇ of the first pattern A is determined by a metrological system capable of varying the relative orientation between a safety device 1 and an optical detector.
  • the optical detector is able to determine that it is aligned with the optical axis ⁇ when it perceives a pattern A with clear vision. When this clear vision is obtained, the system detects the exact relative orientation of the device 1.
  • the optical detector can be a human eye.
  • the optical detector is advantageously an image sensor such as a camera, advantageously coupled with image analysis software capable of detecting when a pattern A is visible and sharp.
  • the orientation of a viewing axis ⁇ thus obtained is recorded in the form of angles. These angles, typically two in a general case, can be expressed in any coordinate system.
  • the lenticular network 2 is cylindrical.
  • the problem is one-dimensional.
  • the safety device 1 is only oriented along an axis parallel to the axis ⁇ of the cylinders. Around this axis ⁇ , or what is equivalent in a plane perpendicular to said axis ⁇ , the axis of vision ⁇ makes with the normal ⁇ N to the device an angle ⁇ .
  • the method has an absolute reference. It is then possible according to the "angular step" ⁇ , known as a characteristic of the network lenticular 2, and characteristics of said angular network 2, to orient the safety device 1 along a second axis of vision ⁇ . This is achieved during a step E4 which applies to the safety device 1 a rotation of an angle respecting the "angular pitch" ⁇ .
  • the device 1 is then oriented along a second axis of vision ⁇ . It is then possible to go to the next step of producing E6 of at least one second pattern B along said second axis of vision ⁇ through the lenticular network 2.
  • E6 through the lenticular network 2 implies using the second embodiment, the “post-engraved” mode.
  • the step of determining E3 of the orientation of a first axis of vision ⁇ can only be done after the step of assembling E2 of said at least one first pattern A, since it is during assembly E2 that the orientation ⁇ of the viewing axis ⁇ is configured randomly.
  • the step of determining E3 of the orientation of the axis of vision ⁇ must be done before any step of making E6, so that the making E6 makes said at least one second engraved pattern B correctly arranged relative to said at least one first motif A printed and correctly placed relative to any possible second engraved motif B already produced.
  • This step E3 is important in that in its absence, an embodiment E6, for example in an arbitrary orientation, has every chance of producing a second engraved pattern interfering with one of said first printed patterns.
  • the safety device 1 resulting from such a process is difficult to reproduce, in that a second engraved pattern depends, for its realization E6 to be possible, from the orientation ⁇ of the axis of vision ⁇ of a first printed pattern.
  • a construction step E5 of said at least one second pattern is added, before the production step E6, a construction step E5 of said at least one second pattern.
  • This construction step E5 creates a second pattern, if necessary by modifying a second preexisting pattern. Its purpose is to include said angle ⁇ of the first axis of vision ⁇ , characteristic of a first printed motif, no longer only in the step of producing the second engraved motif, but also in the content of the second motif itself. .
  • the second engraved pattern comprises a representation of the angle ⁇ or alternatively or complementarily of the angle ⁇ of orientation of the viewing axis ⁇ of the second engraved pattern.
  • a representation may be a numerical value of the angle ⁇ or ⁇ or else a graphic representation of said angle ⁇ or ⁇ or any other coded representation of the angle ⁇ or ⁇ .
  • Such an arrangement advantageously makes it possible to verify the authenticity of the security device 1 by checking that the coding of the angle ⁇ , respectively ⁇ , contained and therefore visible in the second engraved pattern corresponds to the angle ⁇ , respectively ⁇ , of effective orientation of the viewing axis ⁇ , respectively ⁇ , under which can be seen a first printed pattern, respectively a second engraved pattern, on the safety device 1 considered.
  • the construction step E5 of the second engraved pattern may also be such that the content of said second engraved pattern is a function of a position YA of a first printed pattern A relative to the device 1.
  • this position YA varies randomly, from one device 1 to another, essentially for the same reasons of reproducibility of the relative positioning of a first pattern A printed relative to the lenticular network 2 during the printing steps E1 and d E2 assembly.
  • the position YA of a first printed pattern A can be introduced into the content of a second engraved pattern B.
  • the position YA of the printed pattern A can be used to position relatively all or part of a second engraved motif B.
  • the assembly step E2 further comprises an addition, in addition to the image layer 5, of a layer 4 of modifiable material.
  • This modifiable layer 4 is assembled with the image layer 5 under the lenticular network 2. It can be indifferently placed under a transparent image layer 5, or alternatively inserted between an image layer 5 and the lenticular network 2, as illustrated in the figure 1 .
  • the modifiable layer 4 is advantageously transparent.
  • the transparency of the upper layer, among the image layer 5 or the modifiable layer 4, means at least the parts covering the useful segments of the layer located below.
  • the image layer 5 is printed on a segment 8 of a first pattern A.
  • the modifiable layer 4, located above, is advantageously transparent, at least in line with said segment 8, ie at the level of segment 6 of the modifiable layer 4. Said transparency "at right” is understood along an optical path, that is to say along an axis of vision ⁇ , ⁇ .
  • segment 8 corresponds to a printed pattern A.
  • a segment 6 would correspond to a pattern A if the latter was engraved. If pattern A is printed, segment 6 is left free / transparent, so that a printed segment 8 can be seen. If pattern B is engraved, segment 7 is used.
  • a segment 9 corresponds to a printed pattern B. If pattern B is engraved, segment 9 is unused.
  • the direction ⁇ of the axis of vision of a second engraved part merges with the direction ⁇ of the axis of vision ⁇ of a first printed part.
  • such a variegated embodiment requires knowing the angle ⁇ at which the first printed part of the pattern is visible. This is necessary to arrange the engraving tool at an angle ⁇ identical to said angle ⁇ in order to engrave the second part.
  • the step of producing E6 of at least one second engraved pattern can be carried out by etching in the material of the modifiable layer 4, by means of a thermal directive beam, such as a laser beam. This beam performs an etching, through the lenticular network 2, along the associated axis of vision ⁇ audit second reason B.
  • Said at least a first pattern is printed on a surface finally disposed under the smooth underside of the lenticular network 2.
  • This can be achieved, according to one embodiment, by printing on a separate image layer 5 during printing, and then assembled under the lenticular network 2. According to another embodiment, this can be obtained by direct printing on the smooth underside of the lenticular network 2.
  • the invention also relates to a security device 1.
  • This security device 1 comprises at least a first pattern A visible through a lenticular network 2 along a first associated axis of vision ⁇ and at least a second pattern B visible through of said lenticular network 2 along a second associated axis of vision ⁇ , each second axis of vision ⁇ being oriented relative to at least one first axis of vision ⁇ while respecting an "angular pitch" ⁇ characteristic of the lenticular network 2.
  • a safety device 1 could be produced only according to a first “pre-printed” embodiment where all the patterns are printed on an image layer 5.
  • such a security device 1 could be produced only according to a second “post-engraved” embodiment »Where all the patterns are engraved in a modifiable layer 4 through the lenticular network 2.
  • said at least one second pattern B is a function of at least one angle ⁇ of a first axis of vision ⁇ , identified for example relative to a normal ⁇ N to the device 1.
  • a safety device 1 where a first pattern is produced by printing E1 / assembly E2 according to the first "pre-printed” embodiment and a second pattern is produced by etching E6 through the network lenticular 2 according to the second “post-engraved” embodiment is not comparable nor with a device where all the patterns are printed, nor with a device where all the patterns are engraved.
  • a detailed analysis of a device 1 makes it possible to determine, on the final product, the embodiment of each pattern.
  • a simple means is the analysis of the image layer 5 and / or of the modifiable layer 4, most often distinct.
  • An engraved pattern exhibits detectable deformation / burns of an modifiable layer 4, while a printed pattern exhibits only ink deposits on an image layer 5.
  • said at least one second engraved pattern is a function of an angle ⁇ of at least one first axis of vision ⁇ necessarily implies that this angle ⁇ is known at the time of the production of a second engraved pattern.
  • this angle ⁇ is known at the time of the production of a second engraved pattern.
  • the only solution is to use a second engraved embodiment for a second engraved pattern.
  • said angle ⁇ can be contained in the second engraved pattern, for example by its value. It can also be done by transforming the second engraved pattern as a function of the angle ⁇ or what is equivalent as a function of the angle ⁇ .
  • a second engraved pattern can also be a function of the position YA of at least one first printed pattern.
  • This position YA is tainted with uncertainty and therefore randomly individualized, due to the assembly step. Also, it must necessarily be measured, by a metrology step carried out individually for each device 1, similar to that making it possible to determine the angle ⁇ , with similar means.
  • An advantageous means of producing a second engraved pattern as a function of the angle ⁇ of the viewing axis ⁇ of a first printed pattern is to apply a transformation T to the second engraved pattern before its engraving, said transformation T being a function of l 'angle ⁇ or angle ⁇ .
  • Such a transformation T is such that it corrects on the second engraved pattern the effect produced by a rotation R ⁇ orienting the second axis of vision ⁇ according to the normal ⁇ N, so that said at least one second engraved pattern does not appear distorted when seen according to the second viewing axis ⁇ .
  • a pattern B if it is engraved without prior transformation, when it is seen under the axis of vision ⁇ , is deformed. Indeed, the fact of orienting the safety device 1 along the axis of vision ⁇ so that the pattern B is visible, requires a rotation R ⁇ of the device 1 by an angle ⁇ relative to the normal ⁇ N. Such a rotation R ⁇ causes a deformation of the pattern B which is not seen according to the normal ⁇ N to the device 1.
  • the transformation T advantageously corrects this effect by an inverse deformation.
  • a rotation R ⁇ causes an optical deformation of the pattern B in a direction perpendicular to the axis ⁇ of the rotation R ⁇ .
  • a second engraved pattern can also be produced by taking account of the effective position YA of a first printed pattern.
  • a particularly advantageous embodiment of this characteristic consists in producing a safety device 1 where a second engraved pattern, as seen along a second associated ⁇ vision axis, is complementary to a first printed pattern, as seen through a first associated axis of vision ⁇ .
  • the complementarity of a first printed motif and a second engraved motif can take several forms. Complementarity can be geometric. Thus a second engraved pattern, respectively a first printed pattern, can be adjusted edge to edge with a first printed pattern, respectively a second engraved pattern.
  • a second engraved pattern B visible along an axis of vision ⁇ can frame a first printed pattern A, respectively a second pattern B engraved, by a complementary shape, creating thus a juxtaposition effect during a tilting from the axis of vision ⁇ towards the axis of vision ⁇ and vice versa.
  • Complementarity can also be constituted by two complementary patterns, for example, to create an apparent movement effect. This is illustrated by the figure 5 where the printed motif A and the engraved motif B include, for example, overlapping arrows, which when rocked give the impression of movement to the right.
  • a printed motif A includes a photo in a first frame and an engraved motif B includes a second frame of another color but covering the first frame identically.
  • a second engraved pattern B is (necessarily) produced in gray, while a first printed motif A can be produced using a different color.
  • a first printed pattern A can be polychrome, while a second engraved pattern B is necessarily monochrome. Such a combination is advantageous in terms of feasibility and attractiveness for the user.
  • the principle of the invention can be varied to many different embodiments. It is possible to produce one or more printed patterns, on all or part of the surface of the device 1, each visible along an associated axis of vision. By measuring the angle of such an associated viewing axis, it is then possible to produce one or more engraved patterns respecting the “angular pitch” of the lenticular network 2 between them and with the printed patterns.
  • An engraved pattern can even be engraved along an axis of vision associated with a printed pattern, provided that the surface of the device 1 is shared between a first part used by the printed pattern and a part used by the engraved pattern, the first and second parts being disjoint.
  • the lenticular network 2 In the case where the lenticular network 2 is cylindrical, it has an extension axis ⁇ coincident with the axis ⁇ of the cylinders.
  • the "angular pitch" ⁇ characteristic of the lenticular network 2 is measured around said axis ⁇ .
  • the axis ⁇ is also confused with the axis of rotations R ⁇ , R ⁇ , R ⁇ .
  • the safety device 1 described above can be placed on any support, of any shape, by any known assembly means.
  • the invention also relates to the application of a security device according to one of the embodiments described, for producing an identity document, such as an identity card, a passport, a registration certificate, a bank card, etc., thus rendered unforgeable.
  • an identity document such as an identity card, a passport, a registration certificate, a bank card, etc.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (4)

  1. Verfahren zur Herstellung einer Sicherheitsvorrichtung (1), dadurch gekennzeichnet, dass es die folgenden Schritte umfasst:
    - Druck (E1) zumindest eines ersten Musters (A), das durch ein Linsenraster (2) gesehen werden kann,
    - Montage (E2) des Musters (A), das unter dem Linsenraster (2) gedruckt wurde,
    - Bestimmung (E3) einer ersten Sichtachse (Δα), die einen Winkel (α) in Bezug zu einer Normalen (ΔN) zu einer Oberfläche der Vorrichtung (1) aufweist, nach der das erste Muster (A) sichtbar ist,
    - Drehung (E4) der Vorrichtung (1) nach einem "Teilungswinkel" (γ), der das Linsenraster (2) kennzeichnet, um die Vorrichtung (1) entlang einer zweiten Sichtachse (Δβ) zu zeigen, die einen Winkel (β) in Bezug zur Normalen (ΔN) aufweist, wobei der Winkel (β-α) zwischen der ersten Sichtachse (Δα) und der zweiten Sichtachse (Δβ) ein Vielfaches des "Teilungswinkels" y nach einem Verhältnis p. γ = β-α mit p als Ganzzahl ist,
    - einen Schritt mit Aufbau (E5) eines zweiten Musters (B), wobei das zweite Muster durch Anwendung einer winkelabhängigen (α) Verarbeitung verformt wird, wobei die Verarbeitung so beschaffen ist, dass sie auf dem zweiten Muster den Effekt korrigiert, der durch eine Drehung (Rβ) erzeugt wird, die die zweite Sichtachse (Δβ) nach der Normalen (ΔN) ausrichtet,
    - Ausführung (E6) des zweiten Musters (B) durch Lasergravur entlang der zweiten Sichtachse (Δβ) durch das Linsenraster (2).
  2. Verfahren nach Anspruch 1, das ferner den Schritt mit Aufbau (E5) des zweiten Musters (B) umfasst, so dass sein Inhalt von der Position (YA) eines ersten Musters (A) relativ zur Vorrichtung (1) abhängt.
  3. Verfahren nach Anspruch 1 oder 2, wobei der Schritt mit Aufbau (E5) dergestalt ist, dass das zweite Muster (B) eine Ergänzung zum ersten Muster (A) aufweist.
  4. Verfahren nach einem beliebigen der vorstehenden Ansprüche 1 bis 3, wobei der Schritt mit der Montage (E2) eine Hinzufügung einer modifizierbaren Materialschicht (4) umfasst, und wobei der Schritt mit Aufbau (E6) des zweiten Musters (B) eine Gravur in der modifizierbaren Materialschicht (4) vermittels des Laserstrahls durch das Linsenraster (2) umfasst.
EP12816763.2A 2011-12-29 2012-12-21 Verfahren zur herstellung einer sicherheitsvorrichtung Active EP2798396B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1162550A FR2985324B1 (fr) 2011-12-29 2011-12-29 Dispositif de securite
PCT/FR2012/053039 WO2013098513A1 (fr) 2011-12-29 2012-12-21 Dispositif de sécurité

Publications (2)

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EP2798396A1 EP2798396A1 (de) 2014-11-05
EP2798396B1 true EP2798396B1 (de) 2020-07-15

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FR (1) FR2985324B1 (de)
WO (1) WO2013098513A1 (de)

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JP2014524600A (ja) 2011-08-19 2014-09-22 ビジュアル フィジクス エルエルシー 低減された厚さを有する必要に応じて転写可能な光学システム
RU2621558C9 (ru) 2012-08-17 2017-12-05 Визуал Физикс, Ллс Процесс переноса микроструктур на конечную подложку
BR112015022369A2 (pt) 2013-03-15 2017-07-18 Visual Physics Llc dispositivo de segurança óptica
US9873281B2 (en) 2013-06-13 2018-01-23 Visual Physics, Llc Single layer image projection film
US10766292B2 (en) 2014-03-27 2020-09-08 Crane & Co., Inc. Optical device that provides flicker-like optical effects
KR102385592B1 (ko) 2014-03-27 2022-04-11 비쥬얼 피직스 엘엘씨 점멸형 광학 효과를 산출하는 광학 소자
ES3014185T3 (en) 2014-07-17 2025-04-21 Visual Physics Llc An improved polymeric sheet material for use in making polymeric security documents such as bank notes
FR3030851B1 (fr) * 2014-12-17 2021-12-03 Oberthur Technologies Dispositif de securite a reseau lenticulaire comprenant plusieurs motifs couleur graves
KR102693122B1 (ko) 2015-02-11 2024-08-08 크레인 앤 코, 인크 보안 장치를 기재에 표면 도포하기 위한 방법
DE102015015991A1 (de) 2015-12-10 2017-06-14 Giesecke & Devrient Gmbh Sicherheitselement mit Linsenrasterbild
WO2018147966A1 (en) 2017-02-10 2018-08-16 Crane & Co., Inc. Machine-readable optical security device
CA3062579A1 (en) * 2017-06-05 2018-12-13 Crane & Co., Inc. An optical device that provides flicker-like optical effects
AU2018100225A4 (en) * 2018-02-21 2018-03-22 Ccl Secure Pty Ltd Micro-imagery design integration
DE102019113651B4 (de) * 2019-05-22 2021-02-04 Bundesdruckerei Gmbh Sicherheitselement mit anamorph veränderter Abbildung

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Also Published As

Publication number Publication date
FR2985324B1 (fr) 2015-01-16
FR2985324A1 (fr) 2013-07-05
EP2798396A1 (de) 2014-11-05
WO2013098513A1 (fr) 2013-07-04

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