EP3842255A1 - Verfahren zur herstellung einer sicherheitsvorrichtung mit optischer variabilität, und entsprechende sicherheitsvorrichtung - Google Patents

Verfahren zur herstellung einer sicherheitsvorrichtung mit optischer variabilität, und entsprechende sicherheitsvorrichtung Download PDF

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Publication number
EP3842255A1
EP3842255A1 EP20215947.1A EP20215947A EP3842255A1 EP 3842255 A1 EP3842255 A1 EP 3842255A1 EP 20215947 A EP20215947 A EP 20215947A EP 3842255 A1 EP3842255 A1 EP 3842255A1
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EP
European Patent Office
Prior art keywords
pixel
sub
support
region
opacified
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP20215947.1A
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English (en)
French (fr)
Inventor
Paul AZUELOS
Yvonnic Morel
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Idemia France SAS
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Idemia France SAS
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Publication of EP3842255A1 publication Critical patent/EP3842255A1/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
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • 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
    • B42D25/45—Associating two or more layers

Definitions

  • the present invention relates to the field of optical security devices, and more particularly relates to the manufacture of such a security device.
  • the invention applies non-exclusively to security and / or physical identity documents.
  • identity document refers to any document containing information (photograph, surname, first name, etc.) allowing the authorized holder of the document to be identified in a more or less secure manner. This identity information appears physically on the body of the document so as to be visually verifiable by a checking person or machine. In addition to the visually accessible identity information on the body of the identity document, it is possible to store identity information in a memory contained in the body of the identity document (in a chip for example), this information being accessible if necessary. electronically by suitable means to verify the identity of the data subject.
  • the identity document can thus be a passport, an identity card, a driving license, a residence permit, etc.
  • a security and / or identity document can comprise an optical security device allowing the authenticity of the document to be verified.
  • Such an optical security device is difficult to reproduce using conventional technologies, and thus makes it possible to combat the falsification of the security document.
  • the safety device can have optical variability, the visual rendering generated by the safety device then varying as a function of the position of the safety device with respect to the user.
  • Such security devices with optical variability offer an easy and rapid means of identification by the human eye, the optical variability also being able to be identified by a device comprising an optical sensor, such as a mobile terminal of the “smartphone” type. .
  • the optical rendering of the manufactured safety device being variable according to the orientation of the device and being generated by means of two different parts of the device support, modified according to different technologies (printing and laser engraving), the security device is more difficult to forge.
  • the method further comprises a step of adjusting the laser so that the Rayleigh length of the laser is less than or equal to the thickness of the optical separator.
  • the thickness of the optical separator is greater than or equal to 100 micrometers.
  • the opacification is carried out in a uniform manner for all the pixels opposite which a region of the second part of the support is opacified, the opacification being carried out opposite at least one sub-part. of the same sub-pixel of each of said pixels.
  • the color of the rendering of the security device at the level of the first zone is uniform.
  • the opacification is carried out opposite the whole of at least one sub-pixel of at least one pixel.
  • the opacification is thus simpler and faster, the laser not having to adapt to the different shades of gray.
  • the shape of the first zone is determined so as to graphically represent information visible to a user of the security device.
  • the third part comprises one or more regions modified by means of a laser, each region being positioned opposite at least part of at least one sub-pixel of an associated pixel, positioned in the second zone of the matrix, the modified regions of the third part being positioned as close as possible to the matrix.
  • a laserisable layer receiving the printing of the sub-pixels forming the matrix comprises the third part, the laser being able to modify the third part in the thickness of said laserisable layer in line with said at least one subpixel. -pixel, said associated modified region then being juxtaposed to said at least one sub-pixel or very close.
  • the security device is thus easily incorporated into a laser image, this incorporation not requiring additional manufacturing means.
  • the third part is positioned on the first part.
  • the invention further relates to a security document comprising an optically variable security device as described above.
  • the present invention relates to a safety device 100 with optical variability, that is to say a safety device 100 whose visual rendering varies as a function of the position of the safety device 100 with respect to the user of said safety device. 100 or relative to an optical sensor, and thus as a function of the viewing direction of the security device 100.
  • the security device 100 is thus able to generate at least a first visual rendering when it is oriented in a first direction (and thus viewed in this first direction), and a second visual rendering when it is oriented in a second direction ( and therefore visualized according to this second direction).
  • the security device 100 is level 1, the verification of the visual renderings generated by the security device 100 being able to be carried out with the naked eye.
  • the verification of the visual renderings can also be carried out by a device comprising an optical sensor, such as a mobile terminal of the “smartphone” type.
  • the figures 1, 2 , 3 , 5 , 16 and 17 show such safety devices 100, in accordance with exemplary embodiments of the invention.
  • the security device 100 comprises a support 110 comprising a first part 112, a second part 114 and a transparent optical separator 116.
  • the optical splitter 116 separates the first part 112 from the second part 114. In other words, the optical splitter 116 is positioned between the first part 112 and the second part 114.
  • a first face of the optical splitter 116 is typically in contact (or comes integral) with a first face of the second part 114.
  • the first face of the optical splitter 116 is thus typically fixedly attached to the first face of the second part 114, the first face of the second part 114. fixing being for example carried out by lamination.
  • a second face of the optical splitter 116 may be in contact with the first face of the first part 112.
  • the second face of the optical splitter 116 is thus typically fixedly attached to the first face of the first part 112 (see figures 1 to 3 , 5 and 16 ).
  • the second face of the optical splitter 116 may not be fixedly attached to the first face of the first part 112.
  • the security device 100 may further comprise an opaque or transparent layer 118 positioned against a second face of the second part 114 (see figures 1 to 3 and 5 ) or against a second face of the first part 112 (see figures 16 and 17 ).
  • the second part 114 When the layer 118 is positioned against the second part 114, the second part 114 is then positioned between the optical separator 116 and the opaque layer 118.
  • the second face of the second part 114 is typically fixed integrally to the layer 118, the attachment being for example carried out by lamination.
  • the first part 112 When the layer 118 is positioned against the first part 112, the first part 112 is then positioned between the optical separator 116 and the opaque layer 118.
  • the second face of the first part 112 is typically fixed integrally to the layer 118, the attachment being for example carried out by lamination.
  • the support 110 can form a single page of a security document such as a passport.
  • a part of the support 110 comprising the first part 112 and the layer 118 may form a first page of a security document such as a passport, and a first page of a security document such as a passport.
  • part of the support 110 comprising the optical separator 116 and the second part 114 may form a second page of this security document.
  • Layer 118 is then typically transparent.
  • this layer 118 is typically white in color.
  • the first part 112 and the optical separator 116 and / or the opaque or transparent layer 118 are typically made of a material insensitive to laser radiation, which is for example polycarbonate.
  • the optical splitter 116 is made of a material sensitive to laser radiation.
  • the second part 114 is made of a material sensitive to laser radiation, which may also be polycarbonate.
  • the thickness of the first part 112 is for example between 50 and 100 micrometers.
  • the thickness of the second part 114 is typically 50 micrometers.
  • the thickness h PC of the optical separator 116 is typically between 80 micrometers and 300 micrometers, and is for example 100 micrometers.
  • first part 112, the second part 114 and / or the optical separator 116 can each take the form of a layer of the support 110, the support 110 then being a multilayer structure.
  • the same layer may comprise the optical separator 116 and the second part 114, the layer then being made of a material sensitive to laser radiation.
  • the first part 112 of the support 100 comprises a die 120 formed by printing.
  • the matrix 120 forms the first part 112, the matrix 120 then being directly printed on the optical separator 116, or on the opaque or transparent layer 118.
  • the array 120 comprises a plurality of pixels 122, each pixel 122 comprising at least two sub-pixels 123, 124, 125 of different colors, arranged in the same order for each pixel 122.
  • each pixel 122 typically comprises three sub-pixels 123, 124, 125 of different colors, for example the primary colors red, green and blue or yellow, magenta and cyan.
  • each pixel 122 may include four subpixels of different colors, for example yellow, magenta, cyan and white.
  • each pixel 122 is typically square in shape and each sub-pixel 123, 124, 125 is rectangular.
  • the pixels 122 of the matrix 120 can take the form of another geometric figure, such as a rectangle or a triangle (the sub-pixels 123, 124, 125 can then also take the form of a triangle) .
  • the matrix 120 can be partitioned into a first zone 426 and a second zone 428, each zone 426, 428 then comprising a plurality of pixels 122 of the matrix 120 (see figures 4 and 5 ).
  • the matrix 120 can only include the first zone 426, the first zone 426 comprising all of the pixels 122 of the matrix 120.
  • the shape of the first zone 426 can typically represent graphically, seen from above, information visible to the user of the security device 100.
  • This information is typically personal data of the authorized bearer of a security document and / or of identity incorporating the security device 100, or data relating to said document.
  • the information is for example represented in the form of a string of alphanumeric characters, as shown for example by the figure 8 , where the first zone 426 represents the number "1982".
  • the color of the first zone 426 depends for its part on the positioning of the opacified regions 130 opposite the first zone 426, as described in more detail below.
  • the matrix 120 can also include at least one positioning pattern 430 (see for example figure 4 ), allowing the laser to be positioned.
  • Four positioning patterns 430 are for example used, one at each corner of the matrix 120.
  • Each positioning pattern 430 is able to be detected from an acquisition, by an optical sensor, of at least part of the matrix. 120 including this positioning pattern 430.
  • the second part 114 of the support 110 comprises one or more regions 130 opacified by means of a laser, the regions 132 of the second part 114 not being opacified being transparent.
  • each opacified region 130 is positioned opposite one or more sub-pixels of an associated pixel 122. All the pixels 122 of the first zone 426 can thus be associated with opacified regions 130.
  • each opacified region 130 can be positioned facing a part of a sub-pixel 123, 124, 125 or all of the sub-pixel 123, 124, 125, and optionally facing a part or all of one or more other subpixels 123, 124, 125 of the same pixel 122.
  • positioned opposite is meant “positioned under or on” when the safety device 100 is seen from above, ie when the safety device 100 is viewed perpendicularly to the plane formed by the surface of the die 120.
  • pixel associated with the opacified region is meant that the region opacified is positioned opposite a sub-pixel of this pixel, when the security device 100 is seen from above.
  • Each opacified region 130 is thus positioned in the support 110 at the intersection of the projection of the first sub-pixel 123 according to the first direction D1 and of the projection of the second sub-pixel 124 according to the second direction D2.
  • the first subpixel 123 and the second subpixel 124 are typically adjacent subpixels.
  • first direction D1 is typically the direction perpendicular to the plane formed by the surface of the second part 114 and is therefore associated with a first viewing angle ⁇ 0 of 90 degrees with respect to the plane formed by the surface of the second part 114.
  • the second direction D2 is associated with a second viewing angle
  • Each opacified region 130 can also mask, at least in part and in a third direction D3, a third sub-pixel 123, 124, 125 of the pixel 122 associated with the opacified region 130, or a sub-pixel of the next pixel 122 or preceding the pixel 122 associated with the opacified region 130.
  • first”, “second” and “third” of the expressions “first subpixel”, “second subpixel” and “third subpixel” are introduced to distinguish the subpixels 123, 124, 125 within of the same pixel 122. Also, the expression “first sub-pixel” does not designate a sub-pixel positioned at a particular location of pixel 122 (and the same for the expressions “second sub-pixel” and “third sub-pixel”. -pixel ”).
  • first”, “second” and “third” of the expressions “first direction”, “second direction” and “third direction” are introduced to distinguish different viewing directions.
  • the safety device 100 of the figure 1 comprises a plurality of opacified regions 130, each opacified region 130 being positioned under the right subpixel 124 of each associated pixel 122, the second direction D2 thus being oriented at a second negative angle - ⁇ air with respect to the normal to the surface of the support 110 of the security device 100.
  • these opacified regions 130 could be positioned under the left sub-pixel 123 of the associated pixels 122, the second direction D2 then being oriented in a second positive air angle ⁇ with respect to the normal to the surface of the support 110 of the safety device 100.
  • each opacified region 130 of the security device 100 of the figure 2 is positioned opposite the left subpixel 123 and the right subpixel 125 of the associated pixel 122
  • each opacified region 130 of the security device 100 of the figure 3 is positioned opposite the center sub-pixel 124 and the right-hand sub-pixel 125 of the associated pixel 122.
  • other positions of opacified regions 130 could be considered, in order to display different colors according to the different viewing directions.
  • a transparent region 132 of the second part 114 of the support 110 is positioned opposite at least part of at least one sub-pixel 123, 124, 125 of said pixel 122 associated with said opacified region 130. We then say that the transparent region 132 is associated with said pixel 122.
  • At least one subpixel of said pixel 122 must be positioned facing an associated opacified region 130 and at least one other subpixel.
  • pixel of said pixel 122 must be positioned facing an associated transparent region 132.
  • the transparent region 132 of the second part 114 of the support 110 can be positioned so as to allow light to pass at the level of the first sub-pixel 123 when the security device 100 is viewed in the second direction D2, and so as to pass the light at the level of the next or preceding sub-pixel the first sub-pixel when the security device 100 is viewed in the first direction D1, said next or preceding sub-pixel being a sub-pixel of the same pixel as the first sub-pixel pixel, or a subpixel of the next or previous pixel.
  • the transparent region 132 can also be positioned so as to allow light to pass at the level of the sub-pixel following or preceding the first sub-pixel when the security device 100 is viewed in the third direction D3, said sub-pixel being a subpixel of the same pixel as the first subpixel, or a subpixel of the next or previous pixel.
  • the assembly comprising the first part 112, the optical splitter 116 and the second part 114 is positioned between the user's eye (or optical sensor) and the opaque layer 118.
  • each transparent region 132 allows light to pass, so that it is reflected on the opaque layer 118, while each opacified region 130 blocks (or absorbs) the light which is thus not. reflected by the opaque layer 118.
  • Each opacified region 130 therefore creates a shadow at the level of at least part of at least one sub-pixel of the associated pixel 122, according to each viewing direction. We then speak of reading in reflection.
  • the assembly comprising the first part 112, the separator optical 116 and the second part 114 is positioned between the user's eye (or optical sensor) and transparent layer 118, or transparent layer 118 can be positioned between the user's eye (or optical sensor). ) and the assembly comprising the first part 112, the optical splitter 116 and the second part 114.
  • each opacified region 130 When the first part 112 is positioned between the user's eye and the second part 114, each opacified region 130 generates a shadow on at least part of at least one sub-pixel of the associated pixel 122, while when the second part 114 is positioned between the user's eye and the first part 112, at least part of at least one sub -pixel of the associated pixel is filtered by the opacified region 130. This is referred to as transmission reading.
  • the position of the opacified region 130 can be periodic, each opacified region 130 being positioned opposite the same sub-pixel (s) of each pixel 122.
  • the opacification is then carried out in a uniform manner for all the pixels 122 opposite which a region 130 of the second part 114 of the support 110 is opacified, the opacification being carried out opposite at least a sub-part of the same. sub-pixel 123, 124, 125 of each of said pixels 122.
  • each pixel 122 of the matrix 120 being arranged in the same order, for each direction D1, D2, D3, the color displayed at the level of the first zone 426 of the matrix 120 is then uniform .
  • the variation in color between the different directions D1, D2, D3 is then significant and thus very visible.
  • each transparent region 132 of the security device 100 of the figure 1 allows light to pass at the level of the left subpixel 123 of the associated pixel 122 when the security device 100 is viewed in the first direction D1, and allows the light to pass at the level of the right subpixel 124 of the pixel 122 preceding the pixel 122 associated when the security device 100 is viewed in the second direction D2.
  • each opacified region 130 of the security device 100 of the figure 1 hides the right sub-pixel 124 of the associated pixel 122 when the security device 100 is viewed in the first direction D1, and hides the left sub-pixel 123 of the associated pixel 122 when the security device 100 is viewed in the second direction D2.
  • the color displayed by the security device 100 is that of the left sub-pixels 123 of the pixels 122 of the matrix 120 and, when the security device 100 is viewed in the second direction D2, the color displayed by the security device 100 is that of the right subpixels 124 of the pixels 122 of the matrix 120.
  • each opacified region 130 of the security device 100 of the figure 2 is positioned facing the left sub-pixel 123 and the right sub-pixel 125 of the associated pixel 122, the transparent region 132 being positioned facing the middle sub-pixel 124.
  • the color displayed in the first direction D1 is then the color of the sub-pixels 124 of the middle of the pixels 122 of the matrix 120, the color displayed in the second direction D2 is the color of the left sub-pixels 122, and the color displayed in the third direction D3 is the color of the right sub-pixels 125.
  • each opacified region 130 of the security device 100 of the figure 3 is positioned opposite the middle sub-pixel 124 and the right-hand sub-pixel 125 of the associated pixel 122.
  • the color displayed in the first direction D1 is then the color of the left subpixels 123 of the pixels 122 of the matrix 120, the color displayed in the second direction D2 is the color of the right subpixels 125, and the displayed color according to the third orientation O3 is the color of the middle sub-pixels 124.
  • a region 130 positioned with respect to the first sub-pixel of a pixel 122 can encode a first item of information according to which the authorized bearer of a security document comprising the security device 100 is a man, while a region 130 positioned with respect to the second sub-pixel of a pixel 122 can encode a second item of information according to which the authorized holder of the security document is a woman.
  • the matrix 120 can be partitioned into a first zone 426 and a second zone 428.
  • the support 110 of the security device 100 can then also comprise a third part 540.
  • the third part 540 is typically positioned against the first part 112, of so that the first part 112 is positioned between the third part 540 and the optical splitter 116.
  • the third part 540 is made of a material sensitive to laser radiation, and is typically made of polycarbonate.
  • the third part 540 is typically a layer of the support 110. The thickness of the third part 540 is less than or equal to 100 micrometers, in order to limit the effects of optical variation between the matrix 120 and this third part 540 during laser engraving. .
  • the third part 540 comprises one or more regions 542 modified by means of a laser, each region 542 being positioned opposite at least a part of at least one sub-pixel 123, 124, 125 of an associated pixel 122. , positioned in the second zone 428 of the matrix 120.
  • modified regions 542 of the third part 540 are positioned closer to the matrix 120 than the opacified regions of the second part 114, the optical effect is different.
  • the modified regions 542 of the third part 540 make it possible to obtain the final color of the associated pixels 122 of the second zone 428 of the matrix 120, this final color remaining the same regardless of the viewing direction of the security device 100.
  • the final color is the color of the subpixel of this pixel 122 not facing a modified region 542, or is the combination of the colors of the subpixels not facing 'a modified region 542.
  • the third part 540 of the support 110 thus modified and the second zone 428 of the matrix 120 form a graphic representation.
  • the modification carried out by means of the laser is opacification or ablation.
  • the third part 540 can thus comprise one or more opacified regions 542, resulting from carbonization of the third part 540 by means of a laser, the regions 544 of the second part 114 not being opacified being transparent.
  • At least one opacified region 542 is positioned facing at least a sub-part of at least one sub-pixel 123, 124, 125 of at least one pixel 122 associated with said opacified region 542, said pixel 122 being positioned in the second zone 428 of the matrix 120.
  • the third part 540 comprises the first part 112 and therefore the matrix 120.
  • Each region 542 removed is then at least part of at least one sub-pixel of the associated pixel 122.
  • the security device 100 is typically integrated into a security and / or identity document 600 such as a passport, an identity card, a driving license, etc. (see figure 6 ).
  • the support 110 can thus be a card body or one or more pages of a security document, for example such as a passport.
  • the figure 7 shows a method of manufacturing a safety device with optical variability, such as the safety devices 100 described with reference to figures 1 to 3 , 5 , 16 and 17 , the method being in accordance with an exemplary embodiment of the invention.
  • the manufacturing process is typically implemented by a manufacturing system comprising digital data processing means, printing means and laserization means, the laserization means comprising at least one laser and possibly comprising an optical sensor.
  • the laser beam from the laser is typically divergent or collimated.
  • the data processing means typically take the form of a computer, executing a computer program stored in an information medium (or memory) readable by the computer.
  • the method can comprise a step S200 of obtaining the support 110 of the security device 100.
  • the support 110 is typically manufactured during this step S200, this manufacture comprising printing of the matrix 120. forming the first part 112 of the support 110, on the optical separator 116 or the opaque or transparent layer 118.
  • the matrix 120 is more precisely printed by the printing means of the manufacturing system, the printing typically being offset printing, digital printing or inkjet printing, or even a flexography, heliography or printing technique. pad printing.
  • the ink used is typically an ink transparent to infrared radiation, the ink thus not reacting to the laser rays used in step S230 described below.
  • One or more positioning patterns 150 may further be formed by printing during step S200.
  • the support 110 can be manufactured by printing the matrix on the optical separator 116 or the opaque or transparent layer 118, then by laminating the different layers of the support 110, that is, say the layer forming the first part 112, the layer forming the second part 114 and / or the optical separator 116, as well as optionally the opaque layer 118 and / or the layer forming the third part 540.
  • the shape of the first area 426 can be determined, as well as possibly the shape of the second area 428.
  • the first zone 426 represents information which can be personal data of the authorized bearer of the security and / or identity document incorporating the security device 100, or data relating to said document.
  • the first zone can thus take the form of a string of alphanumeric characters.
  • the shape of the first zone 426 can vary from one safety device 100 to another.
  • This step S210 is typically implemented via the digital data processing means, the shape of the first area 426 and of the possible second area 428 being able to be recorded in a computer file.
  • the figure 8 shows an example of representation of such a file computer 800, in which the first field 426 represents the digit "1982" and thus takes the form of that digit.
  • Step S210 may further comprise a step of determining the graphic representation RG to be formed at the second area 428.
  • This graphic representation RG typically takes the form of a photograph of the face of the authorized wearer of the document 600 incorporating the safety device 100.
  • the determination of the graphic representation RG is typically carried out via the digital data processing means, which stores the graphic representation RG in a computer file.
  • the figure 9 shows an exemplary representation of such a computer file 900, in which the graphic representation RG takes the form of a photograph. As visible on this figure 9 , the graphic representation RG does not encroach on the first zone 428.
  • a step S220 at least part of the matrix 120 is acquired, by means of the optical sensor of the laserisation means, this part of the matrix 120 comprising the positioning pattern 430.
  • the positioning pattern 430 is then detected by the digital data processing means, then used so as to position the laser and possibly to size the first zone 426 and / or the second zone 428.
  • the first zone 426 of the matrix 120 is virtually positioned on the matrix 120 as a function of the positioning patterns 430 detected.
  • the acquisition of at least part of the matrix 120 makes it possible in particular, at step S230 described below, to opacify (and therefore to position) the regions 130 with precision with respect to the matrix 120.
  • This acquisition is particularly useful when the opacification step S230 is carried out after the lamination of the step S200, this lamination leading to deformation of the assembled layers.
  • Step S220 may not be implemented in order to reduce the manufacturing costs of the safety device 100.
  • the laser can thus opacify a region 130 facing each pixel 122 of the first zone 426.
  • Step S230 can then be a step of adjusting the laser so that the Rayleigh length of the laser is less than or equal to the thickness h PC of the optical splitter 116, so that the laser can opacify regions 130 in the second part 114 of support 110.
  • the distinction between the optical separator 116 and the second part 114 is created by the opacification of the regions 130.
  • the laser beam may be divergent or collimated.
  • the thickness h PC of the optical splitter 116 is determined (typically at step S200) so that each opacified region 130 is positioned at the intersection of the projection of the first sub-pixel of the associated pixel 122 along the first direction D1 and of the projection of the second sub-pixel of the associated pixel 122 along the second direction D2.
  • the laser period p of the opacified regions (which is equal to the width of an opacified region 130 and an adjacent transparent region 132) is typically equal to the width of a pixel 122.
  • p color p laser
  • the height h PC of the optical separator 116 can thus be determined as a function of the refractive index of the air n air , the refractive index of the material of the optical separator n PC , the width of a sub-pixel w color , n, and the viewing angle ⁇ air.
  • the laser period p of the opacified regions may not be equal to the width of a pixel 122.
  • the color displayed according to the viewing angle ⁇ air is then not homogeneous, this being the case. which typically generates a Moiré effect.
  • the visual rendering is then that of a rainbow moving in the viewing direction.
  • the figure 18 represents three curves showing the variation of the viewing angle ⁇ air as a function of the width of a sub-pixel w color, n , for different values of height h PC of the optical splitter 116.
  • the first curve 190 represents the variation for a height h PC of 80 micrometers
  • the second curve 192 represents the variation for a height h PC of 150 micrometers
  • the third curve 194 represents the variation for a height h PC of 300 micrometers.
  • Such curves can be used in order to determine the values of the height h PC , of the viewing angle ⁇ air viewing and of the width of a sub-pixel w color, n making it possible to obtain the desired optical variability effect. , while respecting the constraints related to safety devices 100.
  • the viewing angle ⁇ air is typically between 20 and 40 degrees and the width of a sub-pixel w color, n is then typically between 30 and 70 micrometers so that the color change is clearly visible. Also, in this example, only the values of curves 190, 192 and 192 located in zone Z can be considered.
  • PC height h of the optical splitter 116 is thus typically between 80 microns and 300 microns when the width of a subpixel color w, n is between 30 micrometers and 70 micrometers and the viewing angle ⁇ ranges from air 20 degrees and 40 degrees.
  • the support 110 can be positioned on a base 1111 so that the second part 114 is positioned between the laser L and the first part 112 of the support 110.
  • the laser L is then set in depending on this positioning.
  • the figure 12 shows an example of the result of the opacification step S230, when the first area 426 takes the form of the number "1982".
  • the method can further comprise a step S240 in which the third part 540 of the support 110 is modified by laserization, with respect to at least a part of at least one sub- pixel of at least one pixel 122 positioned in the second zone 428 of the matrix 120, this modification making it possible to obtain the final and fixed color of said at least one pixel 122, the third part 540 of the support 110 thus modified and the second zone 428 of the matrix 120 forming the graphical representation, determined in step S210.
  • the laser used in modifying step S240 is typically the same laser as that used in opacifying step S230.
  • the support 110 can then be positioned on base 1111 so that the third part 540 of the support 110 is positioned between the laser and the first part 112 of the support 110.
  • the laser used in step S240 may be a different laser from the laser used in step S230.
  • the modification is for example an opacification of the third part 540, opposite said at least part of at least one sub-pixel, produced by means of the laser.
  • the laser punctually carbonizes the third part 540 so as to form a series of points facing said at least part of at least one sub-pixel in the third part 540 (that is to say between the points. two external faces of the third part 540), for example two or four points.
  • the carbonization of the third part 540 opposite at least a part of a subpixel of a pixel 122 generates a level of gray at the level of this subpixel, which makes it possible to obtain the final and fixed color. of pixel 122.
  • the data processing means are in fact able to guide the laser so that the latter carbonizes the third part 540 in order to obtain the final color of each pixel 122 making it possible to form the graphic representation of the second zone 428.
  • the figure 14 is a sectional view of an example of the result of the modification step S240 when performed after the modification step S230.
  • the figures 15A, 15B and 15C show an example of the result of the process when the 800 and 900 files of the figures 8 and 9 are used. More precisely, the figure 15A shows the security device 100 seen in a first viewing direction, the figure 15B shows the security device 100 seen in a second viewing direction, the figure 15C shows the security device 100 seen in a third viewing direction. As can be seen in these figures, the colors of the graphic representation of the second zone 428 are fixed regardless of the viewing direction. The information represented by the first area 426 varies depending on each viewing direction.
  • the modification may alternatively be an erasure by ablation of said at least part of at least one sub-pixel, carried out by means of the laser.
  • the security device 100 can be positioned in a security and / or identity document 600. Steps S310, S220, S230 and possibly step S210 and / or step S240 can be implemented during a phase of personalization of the security and / or identity document 600.

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EP20215947.1A 2019-12-24 2020-12-21 Verfahren zur herstellung einer sicherheitsvorrichtung mit optischer variabilität, und entsprechende sicherheitsvorrichtung Pending EP3842255A1 (de)

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FR1915586A FR3105090B1 (fr) 2019-12-24 2019-12-24 Procédé de fabrication d’un dispositif de sécurité à variabilité optique et dispositif de sécurité associé

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4331856A1 (de) * 2022-08-29 2024-03-06 Thales Dis France Sas Farbschloss

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019175514A1 (fr) * 2018-03-16 2019-09-19 Idemia France Document apte a generer une image couleur

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019175514A1 (fr) * 2018-03-16 2019-09-19 Idemia France Document apte a generer une image couleur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4331856A1 (de) * 2022-08-29 2024-03-06 Thales Dis France Sas Farbschloss
WO2024046739A1 (en) * 2022-08-29 2024-03-07 Thales Dis France Sas Color lock

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FR3105090A1 (fr) 2021-06-25

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