WO2013098513A1 - Security device - Google Patents

Security device Download PDF

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Publication number
WO2013098513A1
WO2013098513A1 PCT/FR2012/053039 FR2012053039W WO2013098513A1 WO 2013098513 A1 WO2013098513 A1 WO 2013098513A1 FR 2012053039 W FR2012053039 W FR 2012053039W WO 2013098513 A1 WO2013098513 A1 WO 2013098513A1
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WO
WIPO (PCT)
Prior art keywords
pattern
axis
vision
according
device
Prior art date
Application number
PCT/FR2012/053039
Other languages
French (fr)
Inventor
Rémy ALBAN
Guilhem GIRAUDET DE BOUDEMANGE
Original Assignee
Oberthur Technologies
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
Priority to FR1162550 priority Critical
Priority to FR1162550A priority patent/FR2985324B1/en
Application filed by Oberthur Technologies filed Critical Oberthur Technologies
Publication of WO2013098513A1 publication Critical patent/WO2013098513A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40Manufacture
    • B42D25/405Marking
    • B42D25/43Marking by removal of material
    • B42D25/435Marking by removal of material using electromagnetic radiation, e.g. laser
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14Security printing
    • B41M3/148Transitory images, i.e. images only visible from certain viewing angles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/21Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose for multiple purposes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D25/00Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30Identification or security features, e.g. for preventing forgery
    • B42D25/342Moiré effects
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B27/00Other optical systems; Other optical apparatus
    • G02B27/22Other optical systems; Other optical apparatus for producing stereoscopic or other three dimensional effects
    • G02B27/2214Other optical systems; Other optical apparatus for producing stereoscopic or other three dimensional effects involving lenticular arrays or parallax barriers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D2035/00Nature or shape of the markings provided on identity, credit, cheque or like information-bearing cards
    • B42D2035/12Shape of the markings
    • B42D2035/20Optical effects
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B42BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42DBOOKS; 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
    • B42D2035/00Nature or shape of the markings provided on identity, credit, cheque or like information-bearing cards
    • B42D2035/44Miniaturised markings

Abstract

Security device comprising at least one first pattern (A) which is visible through a lens array (2) along an associated first line of vision (Δα) and at least one second pattern (B) which is visible through said lens array (2) along an associated second line of vision (Δβ), each second line of vision (Δβ) being oriented relative to at least one first line of vision (Δα) along a characteristic "angular step" (γ) of the lens array (2), wherein said at least one second pattern (B) is derived from at least one angle (a) of a first line of vision (Δα) with respect to a normal (ΔΝ) to the device (l). Method of manufacturing such a security device. Applicability to an identity document.

Description

 SECURITY DEVICE

The present invention relates to a security device based on a multiple pattern display through a lenticular array.

 Such a security device is typically intended to be affixed to a medium, such as an identity document, in order to authenticate it.

 To this end, a security device is difficult to reproduce in order to make it difficult to manufacture or reproduce such a device. In addition, such a security device is advantageously customizable to make it unique.

 A lenticular network, also called lenticular sheet, is composed of elementary lenses of the same optical characteristics, the lenticules, 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 of the lenticules. Each lenticule enlarges, in an image under the lenticular array, an elemental area that is located in alignment with the eye and the optical center of the lenticule.

 In order to achieve such a multiple patterned image, at least two embodiments are known.

A first embodiment, which is called "preprinted" allows, by arranging a specially adapted image under a lenticular array, to view different patterns, each pattern being visible individually along a proper 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. One passes from one axis of vision to another neighboring axis of vision by a rotation according to a "pitch angle" characteristic of the lenticular network. Such an adapted image is typically made separately taking into account said "angular step" to be then assembled with the lenticular array.

 According to a second embodiment, which is called "post-engraved", it is still possible to make a pattern, by etching in a layer. Said layer is predisposed under a lenticular array and is changeable remotely through the lenticular array. The etching is typically performed by means of a beam, such as a laser beam, through said lenticular array. Said beam modifies said layer by adding energy. Said beam is oriented, relative to the device, along a main axis which determines an axis of vision according to which said pattern thus etched is then visible. It is also possible by modifying the relative orientation between the device and the engraving tool, between two successive engravings, to make multiple patterns. If such a change in relative orientation between two engravings respects the "angular step" of the lenticular network, the etched patterns will be separate and separately visible each according to a specific axis of vision, without interference between the patterns. Due to the principle of modification, the etching only makes it possible to produce monochrome patterns.

 The two previous embodiments "preprinted" and "post-engraved" make it possible to produce rather similar devices, in that they comprise n separate patterns, each visible according to an axis of vision proper to the pattern. One passes from one axis of vision from one pattern to another by a rotation of the device respecting the "angular step" or at an angle multiple of the "angular pitch" characteristic of the lenticular array. Each embodiment used alone offers, by its intrinsic complexity of implementation, a relative protection against unauthorized reproduction.

However, it is desired more effective protection for such a safety device. It seems a priori impossible to combine the two previous embodiments. Indeed, it is advisable to respect the constraint of "angular step" between two motives, at the risk if not to realize reasons superimposed.

 In the first embodiment "pre-printed", the "angular step" is intrinsically respected during the manufacture of the image, which incorporates this "angular step".

 In the second "post-etched" embodiment, the "angular pitch" is respected by a relative change of orientation of the engraving axis, between two engravings of successive patterns, according to a rotation respecting the "angular step". The respect of the "angular step" is here made relative to the axis of vision / etching of the first pattern.

 However, according to the first embodiment "pre-printed", during assembly of the image under the lenticular array, an axis of vision corresponding to a first pattern having a random orientation angle is obtained. The orientation angle of this axis of vision is unknown, it seems impossible to engrave a second pattern, according to the second embodiment "post-engraved", which would be removed from an angle respecting the "angular step".

 The present invention, however, provides a safety device and a manufacturing method ingeniously and non-obviously combining the two previously described embodiments "pre-printed" and "post-engraved". This combination, by integrating into the embodiment by etching of a second pattern of the inherent characteristics resulting from the production of a first printed pattern is also highly synergistic.

The subject of the invention is a safety device comprising at least a first visible pattern through a lenticular network according to a first associated axis of vision and at least one second pattern visible through said lenticular network according to a second axis of vision associated, each second axis of vision being oriented relative to at least a first axis of vision according to a "pitch angle" characteristic of the lenticular array, said at least one second pattern being a function of at least one angle of a first axis of vision relative to a normal device.

 According to another characteristic of the invention, the second pattern is a function of at least one position of a first pattern relative to the device.

 According to another characteristic of the invention, the second pattern is deformed by applying a function transformation of at least one angle of a first axis of vision.

 According to another characteristic of the invention, 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 according to the second axis of vision.

 According to another characteristic of the invention, the device is plane 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 sine of the angle of the second axis of vision relative to the normal.

 According to another characteristic of the invention, a second pattern, as seen along a second axis of vision associated, is complementary to a first pattern, as seen along a first axis of vision associated.

 According to another characteristic of the invention, the lenticular network is cylindrical along an axis of extensio.

 The invention also relates to an identity document comprising such a security device.

The invention also relates to a method of manufacturing a safety device comprising the steps following: printing of at least a first pattern that can be seen through a lenticular network, assembling said printed pattern under said lenticular network, determining a first axis of vision according to which a first pattern is visible, rotation of the device according to a "pitch angle" characteristic of the lenticular array to present the device along a second axis of vision, making a second pattern along the second axis of vision through the lenticular network.

 According to another characteristic of the invention, the method also comprises, prior to the embodiment step, a step of constructing the second pattern so that its content is a function of an angle of the first axis of vision relative to a normal to the device. .

 According to another characteristic of the invention, the method also comprises, prior to the production step, a step of constructing the second pattern so that its content is a function of the position of a first pattern relative to the device.

 According to another characteristic of the invention, the construction step is such that the second pattern has a complementarity with the first pattern.

 According to another characteristic of the invention, the assembly step comprises adding a layer of modifiable material, and the step of producing the second pattern comprises etching in said layer of modifiable material by means of a beam , through the lenticular network. Other characteristics, details and advantages of the invention will emerge more clearly from the detailed description given below as an indication in relation to drawings in which:

 FIG. 1 presents a block diagram of a multiple pattern device based on a lenticular array,

- Figure 2 shows a diagram of a process according to The invention,

 FIG. 3 illustrates an exemplary transformation T,

- Figures 4-6 show different examples of complementarity between patterns.

As illustrated in FIG. 1, a lenticular network 2 comprises a periodic succession of lenticules 3, each having a substantially semicircular profile.

 It is possible to make lenticular networks 2 of different types. A first type is a cylindrical lenticular network 2. In a cylindrical lenticular network 2, each lenticule 3 has a substantially semicylindrical profile. The cylindrical lenticules 3 are parallel to each other. Each lenticule 3 enlarges an elementary zone in the form of a strip of width corresponding to the width of a lenticule 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. In such a network the lenticules 3 are substantially cubic with four rounded upper edges. Such a lenticule 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 lenticules 3 are organized according to a square matrix. Each lenticule 3 enlarges an elementary zone or pixel in the form of a square with two sides / square cross with two branches whose two widths of the sides / branches correspond to the width of a lenticule 3, an image located under the lenticular network 2 .

By generalizing, another type of lenticular network 2 is obtained by crossing in the same plane n such cylindrical lenticular 2 networks. In such a network the lenticules 3 are substantially polygonal on 2n sides with 2n rounded upper edges. Such a lenticule 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 lenticules 3 are organized according to a matrix. Each lenticule 3 enlarges an elementary zone or pixel in the form of a polygon with 2n sides / cross with 2n branches whose widths of the 2n sides / branches correspond to the width of a lenticule 3, of an image situated under the lenticular network 2.

 By considering an infinite number n, a spherical lenticular network 2 is obtained. In such a spherical lattice the lenticules 3 are substantially hemispherical. Such a lenticule 3 has a circular shape in the plane of the lenticular network 2 and a hemicircular shape in any plane perpendicular to the plane of the lenticular network 2. The lenticules 3 are typically organized in a square matrix (checkerboard) or hexagonal (in nest 'bee). Each lenticule 3 magnifies an elementary zone or pixel in the form of a circle of diameter corresponding to the width / diameter of a lenticule 3, of an image located under the lenticular network 2.

 The invention is applicable to any type of lenticular network 2.

 Figure 1, one-dimensional, is thus applicable to all types of lenticular array 2. It is a section along a plane normal to the surface of the lenticular array 2. In the case of a cylindrical lenticular network 2, the section is perpendicular to an axis Δ of extension of the cylinders.

 Under the lenticular array 2 is disposed at least one image layer 4, 5. This image layer 4, 5 is periodically divided into sections 10, each section 10 corresponding to a lenticule 3 and is substantially opposite a lenticule 3. Each section 10 comprises segments 6-9 of patterns A, B.

Figure 1 illustrates an example with two patterns A, B, but it is possible to have more patterns. Due to the shape of the lenticule 3, an observer sees the segments 6 or 8 of a first pattern A when looking along a first axis of vision Δ. 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 is looking at along a second axis of vision Δβ. From all the segments 7 or 9 of all the sections 10 of a device 1, the eye reconstructs the second pattern B. So that a segment 6, 8 of the first pattern A and a segment 7, 9 of the second pattern B do not overlap, at the risk of disturbing the rendering of one of the patterns A, B, it is necessary to respect a multiple angle ρ.γ of an "angular step" γ between the orientation a of the first axis of vision Δα and the β orientation of the second axis of vision Δβ.

 If the first axis of vision Δα, respectively the second axis of vision Δβ, has, with respect to a reference, such as the normal ΔΝ at the surface of the device 1, an angle α, respectively an angle β, the angle β-α between the first axis of vision Δα and the second axis of vision Δβ, is multiple of the "angular step" γ, according to a relation ρ.γ = β-α, with p integer.

 It is clear that respecting such an "angular step" γ amounts to respecting a precise spacing between the segments 6, 8 of a first pattern A on the one hand and the segments 7, 9 of a second pattern B on the other hand .

 As seen above, there are at least two known embodiments of multiple patterns A, B, with a lenticular network 2.

A first embodiment "pre-printed" consists in arranging a specially adapted image layer 5 under a lenticular array 2. Such an image layer 5 is decomposed into segments 8 corresponding to a first pattern A and into segments 9 corresponding to one second pattern B. The content of the segments 8, 9 depends on the respective content of the different patterns A, B. The location of the segments 8, 9 depends on the characteristics of the lenticular network 2. the segments 8, 9 must be located in the sections 10. The periodicity of the segments 8, 9 must respect the periodicity of the lenticules 3 of the lenticular network 2.

 In this "pre-printed" embodiment, the respect of the "angular pitch" γ characteristic of the lenticular network 2 is obtained by a correct spacing of the segments 8 of a first pattern A relative to the segments 9 of a second pattern B.

 In this embodiment, an image comprising the various patterns is typically made by printing, for example offset. Such an embodiment thus advantageously makes it possible to produce one or more patterns A, B in color.

 The accuracy of this printing inherently allows to respect a periodicity and a relative positioning of the segments 8, 9 of different patterns A, B which guarantees the respect of an "angular step" γ.

 The printing of this image can be performed on an image layer 5, then assembled with / under the lenticular network 2. Alternatively the printing of this image can be directly performed on the back plane of the lenticular array 2, which makes then image layer function 5.

However, it should be noted that in both cases it is impossible to obtain a repeatable positioning of the image relative to the lenticular network 2. A lenticular network 2 typically has a period / section width of between 30 m and 1 mm. , preferably between 60 and 150 μπι. It follows from the positioning inaccuracies of the image layer 5 relative to the lenticular network 2, during the step of assembling a printed image layer 5 under a lenticular network 2, or inaccuracies of calibration of the printing relative to the network. lenticular 2, during the direct printing step under the lenticular array 2, an inevitable relative positioning uncertainty between the image and the lenticular network 2. It results from this uncertainty that the angle. a first axis of vision Δα of a first printed pattern A is undetermined and can not be known in advance. The angle is the result of the manufacturing process and can only be known after assembly / printing of the image layer 5 and the lenticular network 2. It is the same for the angle -β of a second axis of vision Δβ a second pattern B printed.

 Despite this, compliance with the "relative angular step" γ between a first axis of vision Δ and a second axis of vision Δβ, because of the intrinsic precision of the printing process, is achieved, and guarantees the effect of multiple patterns A, B, each visible under a separate axis of vision Δα, Δβ.

 A second "post-burned" embodiment uses an editable layer 4. Such an editable layer 4 is assembled under a lenticular array 2. It is then etched, typically by means of a beam, such as a laser beam, through said lenticular array 2. This etching is thus advantageously carried out remotely and a posteriori, after assembly of 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, modifying said modifiable layer 4 and perform by etching at minus a pattern A, B by engraving the corresponding segments 6 and / or 7.

A lenticule 3 is optically used here in an optical path opposite to that of vision. However, such 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 axis of etching determines an axis of vision Δα, respectively Δβ, according to which said pattern A, respectively B, thus etched is then visible. Thus a pattern A, respectively a pattern B, visible from an axis of vision Δα, respectively Δβ, must be engraved in directing the etching beam along said axis of vision Δα, respectively Δβ. With reference to FIG. 1, a beam oriented along the first axis Δα, engraves in a modifiable layer 4, a segment 6 of a first pattern A. This first pattern A will then be visible along this first axis Δα. Similarly, a beam oriented along the second axis Δβ, engraves in a modifiable layer 4, a segment 7 of a second pattern B. This second pattern B will then be visible along this second axis Δβ.

 It is thus possible, by modifying the orientation of the device 1 or the engraving beam by a multiple angle ρ.γ of the "angular pitch" between two engravings, to respect the "angular pitch" γ and to make patterns A, B multiple and distinct separately visible each according to a clean axis of vision, without interference between the patterns.

 It should be noted that because of the modification principle, etching only makes it possible to produce monochrome patterns. Typically, the etching beam burns a layer 4, for example transparent polycarbonate, enriched in carbon. This burn reveals carbon black. Advantageously, a substrate or a lower white layer 11 provides a contrasting screen. A modulation of the beam power makes it possible to achieve a wide variety of gray levels.

 The respect of the "relative angular step" γ is here obtained by an orientation change of a multiple angle ρ.γ of the "angular step" γ, between a first angle of etching of a first pattern A, known because arbitrarily chosen to engrave a first pattern A and a second angle of etching β, a second pattern B.

A combination of the two previous embodiments by printing (pre-printed) and etching (post-engraved) simply seems impossible. Indeed, such a combination faces the following problem. Assuming that at least one first pattern A is produced by printing, the orientation α of its axis of vision Δα is not not known, because of the uncertainty introduced by the assembly of the image layer 5 with the lenticular network 2. To then consider an engraving of a second pattern B it is imperative to know said orientation a to be able to respect the "no angular "γ. The orientation of the etching beam can be done only relative to an angle of an axis of vision Δα of a pattern A previously made.

 This difficulty is exploited in that it makes complex a series manufacture of a safety device 1. 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 difficult to reproduce the manufacturing process and therefore the device 1.

 According to the invention, a security device is manufactured according to a method illustrated in FIG. 2 and comprising the following steps.

 A first step consists of printing El at least a first pattern A on an image layer 5, so that it is visible through a lenticular array 2. Thus, said at least one first pattern A is produced according to the first "pre-printed" embodiment previously described by a prior printing followed by an assembly under the lenticular array 2. The fact that said at least one pattern A is visible through a lenticular array 2 implies that its printing is segmented in segments 8, 9 respecting an "angular step" γ of said lenticular array 2. This "angular step" γ, at the level of the print El, results in the respect of a spatial period in the image thus printed.

Thus, for a cylindrical lenticular network 2, the image layer 5 is printed respecting parallel strips of width equal to the period 10 of the lenticular array 2. Each such band is divided into n sub-parallel disjoint strips, where n is the total number, printed and / or engraved with desired motifs in the end. These patterns are divided into patterns printed in an image layer 5 in step E1 and patterns etched in an editable layer 4 in a step E6 described above.

 Likewise for a generalized lenticular network 2, the image layer 5 is printed respecting a checkerboard / matrix corresponding to the checkerboard / arrangement matrix of the lenticules 3.

 After printing El, said at least one first pattern A, is assembled E2 under said lenticular network 2. The two previous steps of printing E1 and E2 assembly are distinct when printing El is performed on an image layer 5, assembled Then, under the lenticular network 2. The two preceding stages of printing E1 and assembly E2 are on the contrary combined when the printing E1 is directly carried out on the back, on the smooth face, of the lenticular network 2.

 In both cases, the assembly step E2 introduces an uncertainty on the orientation of the axis (or axes if the printed patterns A are multiple) vision Δ under which is visible the pattern A.

 This uncertainty is such that safety devices 1 arranged on a manufacturing plate, for which the assembly E2 is also produced with a single image layer 5 covering the entire plate, do not produce identical axes of vision Δα. a device 1 to the other belonging to the same plate.

 In order to overcome this uncertainty, and to be able to carry out the step E6 of etching another pattern B, it is necessary to determine E3 precisely the axis of vision Δα of at least one pattern A.

It should be noted here that if several patterns A have been printed, they necessarily respect the "angular pitch" γ of the lenticular array 2 between them. The determination step E3 can therefore only be performed for one of these patterns A , the axis of vision Δα of any other printed patterns A deduced therefrom by applying a rotation angle ρ.γ multiple "angular step", a function of characteristics of the lenticular network 2. Also the determination step E3 is here described only for a first pattern A.

 The determination of the axis of vision Δα of the first pattern A is performed 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 Δα when it perceives a pattern A with clear vision. When this clear vision is obtained, the system raises the exact relative orientation of the device 1. The optical detector can be a human eye. However, in order to automate the process, the optical detector is advantageously an image sensor such as a camera, advantageously coupled with an image analysis software capable of detecting when a pattern A is visible and sharp.

 The orientation of an axis of vision Δα thus obtained is recorded in the form of angles. These angles, typically two in a general case, can be expressed in any reference. Advantageously, by simplifying the reference, it is possible to have only one angle a. Such a simplification is possible considering only the angle made by the axis of vision Δα with the normal ΔΝ to the device.

 It is still possible to simplify the reference when the lenticular network 2 is cylindrical. In this case the problem is one-dimensional. The safety device 1 is oriented only along an axis parallel to the axis Δ of the cylinders. Around this axis Δ, or what is equivalent in a plane perpendicular to said axis Δ, the axis of vision Δα makes with the normal ΔΝ to the device an angle a.

Once identified the orientation of the axis of vision Δα of the first pattern A, the method has an absolute reference. It is then possible according to the "angular step" γ, known as a characteristic of the lenticular network 2, and the characteristics of said angular network 2, to orient the safety device 1 according to a second axis of vision Δβ. This is done during a step E4 which applies to the safety device 1 a rotation of an angle respecting the "angular step" γ.

 In the case of a cylindrical network, said rotation is applied around the axis Δ of the cylinders and at an angle ρ.γ multiple of the "angular step" γ, with p integer.

 The device 1 is then oriented along a second axis of vision Δβ. It is then possible to proceed to the next step of making E6 of at least a second pattern B along said second axis of vision Δβ through the lenticular array 2. Such an embodiment E6 through the lenticular array 2 involves using the second embodiment, the "post-bass" mode.

 It is possible to repeat the steps E4 and E6, and to engrave a pattern B along an axis of vision Δβ, and then to apply a new rotation according to another angle ρ.γ multiple of the "angular step" γ in order to burn to again another motive.

 The determination step E3 of the orientation of a first axis of vision Δα can be done only after the assembly step E2 of said at least one first pattern A, since it is during the assembly E2 random configuration of the orientation of the axis of vision Δα. The determination step E3 of the orientation of the axis of vision Δα must be done before any realization step E6, so that the realization E6 carries out said at least one second engraved pattern B correctly arranged relative to said at least a first pattern A printed and correctly arranged relative to any possible second engraved pattern B already made.

 This step E3 is important in that in its absence, an embodiment E6, for example according to an arbitrary orientation, is likely to produce 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 etched pattern depends, so that its realization E6 is possible, the orientation a of the axis of vision Δ of a first printed pattern.

 In order to reinforce the security of the security device 1 obtained, by mixing even more intimately said first printed patterns and said second etched patterns and the two steps E1 / E2 and E6 respectively producing them, it is advantageous to add, beforehand to the realization step E6, a construction step E5 of said at least one second pattern. This construction step E5 creates a second pattern, possibly by modifying a second preexisting pattern. It aims to include said angle ex of the first axis of vision Δ, characteristic of a first printed pattern, not only in the step of producing the second etched pattern, but also in the content of the second pattern itself. .

 Thus, according to one embodiment, the second etched pattern comprises a representation of the angle or alternatively or complementarily the angle β of orientation of the axis of vision Δ β of the second etched pattern. This is equivalent. Indeed, as seen above the angle a and the angle β are necessarily linked by a relationship with the "angular step" y. Such a representation may be a numerical value of the angle α or β or a graphical representation of said angle ex or β or any other coded representation of the angle ex or β. Such an arrangement advantageously makes it possible to check the authenticity of the safety device 1 by checking that the coding of the angle a, respectively β, contained and therefore visible in the second etched pattern corresponds to the angle a, respectively β, of effective orientation of the axis of vision Δ, respectively Δ β, under which can be seen a first printed pattern, respectively a second engraved pattern, on the security device 1 considered.

The construction step E5 of the second etched pattern may still be such that the content of said second etched pattern is a function of a position YA of a first printed pattern A relative to the device 1. In fact, like the angle a, this position YA varies randomly, from one device 1 to the other, essentially for the same reasons for reproducibility of the relative positioning of a first pattern A printed relative to the lenticular network 2 during the printing stages E1 and E2 assembly.

 Similarly, the position YA of a first printed pattern A can be introduced into the contents of a second engraved pattern B. According to another embodiment, the position YA of the printed pattern A can be used to position relatively all or part of a second engraved pattern B.

 In order to be able to make at least a second engraved pattern B through the lenticular network 2, 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 array 2. It can be indifferently arranged under a transparent image layer 5, or alternatively inserted between an image layer 5 and the lenticular network 2, as illustrated in FIG. In this second case, 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 portions covering the useful segments of the layer below. Thus, in the configuration of FIG. 1, the image layer 5 is printed on a segment 8 of a first pattern A. The modifiable layer 4, situated above, is advantageously transparent, at least to the right of said segment 8, or at least level of the segment 6 of the modifiable layer 4. Said transparency "to the right of" means along an optical path, or along an axis of vision Δα, Δβ.

It may be noted that in Figure 1 some segments corresponding to the same pattern are superimposed. Thus a segment 8 corresponds to a pattern A printed. A segment 6 would correspond to a pattern A if the latter was engraved. If the pattern A is printed, the segment 6 is left free / transparent, so that a printed segment 8 can be seen. If the pattern B is etched, the segment 7 is used. A segment 9 corresponds to a pattern B printed. If pattern B is etched, segment 9 is unused.

 It is also possible to spatially combine the two "pre-printed" and "post-engraved" embodiments in order to achieve the same pattern A or B with a first part of the printed pattern surface and a second part of the surface of the printed pattern. engraved pattern. It goes without saying that the first part and the second part are necessarily disjointed.

 Thus, with reference to FIG. 1, if a pattern A is partially printed, the pixels / strips in a first printed area portion use the segment 8. On the contrary the pixels / strips in a second etched area portion use the segment 6 .

 In this variegated embodiment, the direction β of the axis of vision of a second etched portion merges with the direction a of the axis of vision Δα of a first printed portion. The "angular step" is again respected here, with a value β-α = ρ.γ = 0, ie p = 0.

 Such a variegated embodiment again requires the angle α under which the first printed portion of the pattern is visible. This is necessary to have the etching tool at an angle β identical to said angle aa to burn the second part.

 Since the modifiable layer 4 has been assembled with the lenticular network 2 in step E2, the step of producing E6 of at least one second etched pattern can be carried out by etching in the material of the modifiable layer 4 by means of a directional thermal beam, such as a laser beam. This beam carries out an etching, through the lenticular network 2, along the axis of vision Δβ associated with said second pattern B.

Said at least one first pattern is printed on a Finally, this surface can be made, according to one embodiment, by printing on a separate image layer 5 during printing, and then assembled under the lenticular array 2. According to another This embodiment can be obtained by direct printing on the smooth underside of the lenticular array 2.

 The invention also relates to a safety device 1. This security device 1 comprises at least a first pattern A visible through a lenticular array 2 according to a first axis of vision Δα associated and at least a second pattern B visible through said lenticular network 2 according to a second axis of vision Δβ associated, each second axis of vision Δβ being oriented relative to at least a first axis of vision Δ while respecting a "pitch angular" Y characteristic of the lenticular network 2. Such a safety device 1 could be made only according to a first embodiment "pre-printed" where all the patterns are printed on an image layer 5. Similarly, such a safety device 1 could be made only according to a second embodiment "postgraded" where all the patterns are etched in an editable layer 4 through the lenticular network 2.

 However, according to an important additional feature of the invention, said at least one second pattern B is a function of at least one angle α of a first axis of vision Δα, identified for example relative to a normal ΔΝ to the device 1.

It is important to note that such a security device 1, where a first pattern is made by printing El / assembly E2 according to the first embodiment "pre-printed" and a second pattern is made by etching E6 through the network Lenticular 2 according to the second embodiment "post-engraved" is not comparable neither with a device where all the patterns are printed, nor with a device where all the patterns are etched. A detailed analysis of a device 1 allows determine, on the final product, the embodiment of each pattern. A simple way is the analysis of the image layer 5 and / or the modifiable layer 4, most often distinct. An etched pattern has detectable deformations / burns of an editable layer 4, while a printed pattern exhibits only ink deposits on an image layer 5.

 The fact that said at least one second etched pattern is a function of an angle ex of at least a first axis of vision Δα necessarily implies that this angle is known at the time of producing a second etched pattern. For this the only solution is to use a second embodiment engraved for a second etched pattern.

 As indicated above, said angle can be contained in the second engraved pattern, for example by its value. It can still be by a transformation of the second etched pattern according to the angle a or what is equivalent function of the angle β.

 According to another characteristic, a second etched pattern may still 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, because of the assembly step. Also, it must necessarily be measured by a metrology step performed individually for each device 1, similar to that for determining the angle a, with similar means.

 An advantageous way of producing a second etched pattern according to the angle of the axis of vision Δ of a first printed pattern is to apply a transformation T to the second etched pattern before it is etched, said transformation T being a function of the angle a or angle β ·

Such a transformation T, particularly advantageous in that it allows a simple visual control, is such that it corrects on the second etched pattern the effect produced by a rotation Ιβ orienting the second axis of vision Δβ according to the normal ΔΝ, so that said at least one second etched pattern does not appear deformed when viewed according to the second axis of vision Δβ.

 Thus, as shown in Figure 3, a pattern B, if engraved without prior transformation, when viewed under the axis of vision Δβ, is deformed. Indeed, the fact of orienting the safety device 1 along the axis of vision Δβ so that the pattern B is visible, requires a rotation R of the device 1 by an angle β relative to the normal ΔΝ. Such a rotation Rp> causes a deformation of the pattern B which is not seen according to the normal ΔΝ to the device 1. The transformation T advantageously corrects this effect by an inverse deformation.

 Thus, in the case where the safety device 1 is plane, a rotation R> causes an optical deformation of the pattern B in a direction perpendicular to the axis Δ of the rotation R.

 Also, the application of a transformation T, compressing the dimension Y by multiplication by a coefficient K = sin β, applied before etching to the pattern B corrects said deformation. Thus, the pattern B, as seen from the axis of vision Δβ, appears undeformed, with a normal 1: 1 ratio.

The application of such a transformation T requires knowing precisely the angle β and thus previously the angle to which it is linked by the "angular step" γ.

The final effect is simple to verify in order to prove the authenticity of the safety device 1 thus produced.

The pattern B must appear unmodified, when viewed according to the axis of vision Δβ.

 For an angle β of 70 °, the dimension Y is multiplied by K = 0.94. For an angle β of 90 °, the dimension Y is unchanged, K = 1.

 It has been seen that a second engraved pattern can also be realized taking into account the actual position YA of a first printed pattern.

A particularly interesting embodiment of this feature consists in producing a device for security 1 where a second etched pattern, as seen along a second axis of vision Δβ associated, is complementary to a first printed pattern, as seen along a first axis of vision Δα associated.

 Such complementarity appears, and can thus simply be verified, by orienting the safety device 1 successively along the axis of vision Δα and along the axis of vision Δβ. Thus, a rotation Ry, at an angle p. Y multiple of the "angular step" γ, orienting the second axis of vision Δβ according to the first axis of vision Δα, superimposes the first printed pattern and the second etched pattern and shows their complementarity.

 The complementarity of a first printed pattern and a second engraved pattern can take many forms. Complementarity can be geometric. Thus a second etched pattern, respectively a first printed pattern, can be fitted edge to edge with a first printed pattern, respectively a second engraved pattern.

 As illustrated in FIG. 4, a second engraved pattern B visible along an axis of vision Δβ, respectively a first pattern A printed visible along an axis of vision Δα, may come to frame a first pattern A printed, respectively a second pattern B engraved, by a complementary shape, thus creating a juxtaposition effect during a rocker from the axis of vision Δ to the axis of vision Δβ and vice versa.

 The complementarity can be formed by two complementary motifs, for example, to create an apparent movement effect. This is illustrated in FIG. 5 where the printed pattern A and the engraved pattern B comprise, for example, nested arrows, which at the flip-flop give an impression of displacement to the right.

Complementarity can still be colored. Thus, as illustrated in FIG. 6, a printed pattern A comprises a picture in a first frame and an engraved pattern B comprises a second frame of another color but covering the first frame identically. A second engraved pattern B is (necessarily) made in gray, while a first printed pattern A can be made using a different color.

 Due to the embodiment, a first printed pattern A may 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.

 In all of these examples, non-limiting, of complementarity, a precise geometric "adjustment" is made between a first pattern A printed and a second pattern B engraved.

 Such an adjustment requires a very precise knowledge of both the angle and the position YA of the first printed pattern A, in order to place the second pattern B, by etching, accordingly. The final effect thus obtained is advantageously difficult to obtain, since it requires at least one delicate metrology step, and at the same time easy to control visually, including without requiring any tool.

 The principle of the invention can be varied to many different embodiments. It is possible to make 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 axis of vision, it is then possible to produce one or more engraved patterns respecting the "angular pitch" of the lenticular array 2 between them and with the printed patterns.

 An engraved pattern may 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 portion used by the printed pattern and a part used by the engraved pattern, the first and the second parts being disjointed.

In the case where the lenticular network 2 is cylindrical, it has an axis of extension Δ merged with the axis Δ of the cylinders.

 In this case the "angular step" γ, characteristic of the lenticular network 2 is measured around said axis Δ. The axis Δ is still coincident with the axis of rotations R, Rp, Ry.

 The safety device 1 described above may be disposed 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 described embodiments, to produce an identity document, such as an identity card, a passport, a registration certificate, a bank card, etc., thus rendered unfalsifiable.

Claims

1. Safety device comprising at least a first pattern (A) visible through a lenticular network (2) according to a first axis of vision (Δ) associated and at least one second pattern (B) visible through said lenticular network (2) according to a second axis of vision (Δβ) associated, each second axis of vision (Δβ) being oriented relative to at least a first axis of vision (Δ) according to a "pitch angle" (γ) characteristic of the lenticular array ( 2) characterized in that said at least one second pattern (B) is a function of at least one angle (a) of a first axis of vision (Δ) relative to a normal (ΔΝ) to the device (1).
2. Device according to claim 1, wherein the second pattern (B) is a function of at least one position (YA) of a first pattern (A) relative to the device (1).
3. Device according to claim 1 or 2, wherein the second pattern (B) is deformed by applying a transformation (T) function of at least one angle (a) of at least a first axis of vision (Δα). .
4. Device according to claim 3, wherein said transformation (T) is such that it corrects on said at least one second pattern (B) the effect produced by a rotation (Εβ) orienting the second axis of vision (Δβ) according to the normal (ΔΝ), so that said at least one second pattern (B) does not appear deformed when viewed according to the second axis of vision (Δβ).
5. Device according to claim 4, wherein the device (1) is plane and wherein said transformation (T) is an application of a multiplier coefficient (K) to the dimension (Y) of the second pattern (B) perpendicular to a axis (Δ) of a rotation (1¾β) orienting the second axis of vision (Δβ) according to the normal (ΔΝ), said ratio (K) being equal to the sine of the angle (β) of the second axis of vision (Δβ ) relative to the normal (ΔΝ).
6. Device according to any one of claims 2 to 5, wherein a second pattern (B), as seen along a second axis of vision (Δβ) associated, is complementary to a first pattern (A), as seen according to a first axis of vision (Δ) associated.
7. Device according to any one of claims 1 to 6, wherein the lenticular array (2) is cylindrical along an axis of extension (Δ).
8. Identity document comprising a device (1) for security according to any one of the preceding claims.
9. A method of manufacturing a safety device (1) characterized in that it comprises the following steps:
 printing (El) of at least a first pattern (A) able to be seen through a lenticular network (2),
 - assembly (E2) of said pattern (A) printed under said lenticular network (2),
 determination (E3) of a first axis of vision (Δ) according to which a first pattern (A) is visible,
 rotation (E4) of the device (1) according to an "angular pitch" (γ) characteristic of the lenticular array (2) in order to present the device (1) along a second axis of vision (Δβ),
 realization (E6) of a second pattern (B) according to the second axis of vision (Δβ) through the lenticular network (2).
10. The method of claim 9, further comprising, prior to the embodiment step (E6), a step of construction (E5) of the second pattern (B) so that its content is a function of an angle (a) of the first axis of vision (Δ) relative to a normal (ΔΝ) to the device (1) -
11. The method of claim 9 or 10, further comprising, prior to the embodiment step (E6), a construction step (E5) of the second pattern (B) so that its content is a function of the position (YA) of a first pattern (A) relative to the device (1).
12. The method of claim 10 or 11, wherein the step of construction (E5) is such that the second pattern (B) has a complementarity with the first pattern (A).
The method according to any of claims 9 to 12, wherein the assembling step (E2) comprises adding a layer of modifiable material (5), and wherein the step of producing (E6) the second pattern (B) comprises etching in said layer of modifiable material (5) by means of a beam, through the lenticular network (2).
PCT/FR2012/053039 2011-12-29 2012-12-21 Security device WO2013098513A1 (en)

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FR1162550A FR2985324B1 (en) 2011-12-29 2011-12-29 Security device

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FR2985324A1 (en) 2013-07-05
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