Procedure for personalizing a secure document

Abstract

Method for personalizing a secure document. The invention relates to a method for personalizing a secure document comprising at least three pages linked together by a hinge around which they can pivot, a first page being at least partially covered by a personalization layer comprising a first pixel matrix and at least a second interlaced pixel matrix whose appearance is modifiable by application of a laser beam, a second page comprising at least one transparent window having at least one optical grating arranged opposite the personalization layer, said personalization method comprising: the generation of a first image by applying, through said optical grating, the laser beam to the first pixel matrix of the personalization layer, and of a second image by applying, through said optical grating,of the laser beam on the second pixel matrix of the personalization layer. Figure for the abbreviation: Figure 4,

Description

Title of the invention: Method for personalizing a secure document Previous technique

[0001] This application falls within the general field of secure documents. It relates more particularly to a method for personalizing a secure document, a secure document intended to be personalized by means of the personalization method, a method for authenticating a secure document personalized by means of the personalization method, and a system configured to implement said authentication method.

[0002] The invention finds a particularly advantageous application in the field of secure documents in the form of booklets, such as passports.

[0003] Fig. 1 shows a secure document 10 in the form of a booklet.

[0004] Conventionally, such a secure document comprises a page of front cover 11 and a back cover page 12, for example formed from a piece of cardboard folded in half.

[0005] Cover pages 11 and 12 can also be laminated to protect them from wear and tear caused by the numerous handlings to which the secure document will be subjected during its period of validity.

[0006] The secure document 10 generally comprises a data page 13 followed by at least one page 14, which may belong to a booklet containing a plurality of pages. The data page 13 and the at least one page 14 are protected by the cover pages 11 and 12.

[0007] The data page 13, at least one page 14 and the front cover pages 11 and back cover pages 12 are for example assembled by means of a seam forming a hinge 15 around which the different pages can pivot to open, close or browse the secure document 10.

[0008] More specifically, the secure document 10 can take several configurations:

[0009] - a so-called closed configuration in which a value of an angle “a” between the The front cover page 11 and the back cover page 12 are at 0°, in other words, the front cover page 11 is folded substantially parallel to the back cover page 12; and

[0010] - at least one aperture configuration in which the value of angle "a" is greater than 0°, a maximum opening of the secure document 10 would correspond for example to an angle “a” whose value would be 180° (flat opening).

[0011] Thus, the example illustrated in [Fig. 1] shows a secure document 10 open between the data page 13 and at least one page 14. In the example illustrated here, the front cover page 11 and the data page 13 are open at an angle "a" of approximately 90° relative to the back cover page 12 (which serves as a reference).

[0012] Fig. 1 further shows that in the case where the secure document 10 is a passport, the data page 13, also called "datapage", includes in particular various information related to the document holder.

[0013] To contribute to the authentication of the secure document 10 and its holder, and / or to limit the risks of counterfeiting of these documents, which is particularly critical in the case of identity documents, such a secure document 10 also includes a plurality of security elements.

[0014] Such security features include, for example, a photograph of the holder of the secure document 10 engraved in grayscale in the transparent window of the data page 13 and the same photograph printed in color on page 14 or on the front cover page, also called the endpaper, 11, for example, opposite the data page 13. Thus, when the data page 13 and page 14 or the front cover page 11 are superimposed, the grayscale photograph in the transparent window is superimposed on the color photograph. This example assumes that the data page 13 is made of a rigid polymer material such as polycarbonate.

[0015] The transparent window can also be fitted with lenses and an image is engraved on it in such a way as to give an impression of movement (so-called "SLI" image for "Stereo Laser Image"): an observer then sees a kind of 3D image in shades of gray in the transparent window, and this image is in color when it is superimposed on the color image of the front cover page 11.

[0016] An example of a safety element is illustrated in figures 2A to 2D.

[0017] Here, the secure document includes a greyscale image 17a engraved in a transparent window 16 of the data page 13 ([Fig.2A]) and the same image 17b printed in colour on the front cover page 11 ([Fig.2B]).

[0018] When the data page 13 and the front cover page 11 are superimposed (the [Fig.2C] schematically illustrating the flapping movement of the data page 13 onto the front cover page 11 by rotation around the hinge 15), the image 17a is superimposed, in theory, on the image 17b ([Fig.2D]).

[0019] However, due to the constitution of such a secure document 10 in booklet form, there is a misalignment between the different pages constituting this document depending on the angle; consequently, depending on the value of the angle "a", image 17a may not coincide with image 17b.

[0020] Such a shift “d” is visible in [Fig. 3], which represents a secure document 10 in any opening configuration. A section plane II perpendicular to the hinge 15 is also shown in this [Fig.3].

[0021] International patent application WO 2020 / 030787 in the name of the Applicant, proposes a secure document including a security element taking advantage of this phenomenon.

[0022] For this purpose, the transparent window 16 of the data page 13 is equipped with an optical network, and the front cover page 11 has at least two interlaced images.

[0023] By way of example, a first image among the interlaced images represents the face of the holder from a first angle of view in which, for example, the face is looking upwards, a second image among the interlaced images represents the face of the holder from a second angle of view in which, for example, the face is facing forward, and a third image among the interlaced images represents the face of the holder from a third angle of view in which, for example, the face is looking downwards.

[0024] Depending on the value of angle 'a', the optical grating shifts from a first position, in which it reveals the first image, to a second position, in which it reveals the third image. The optical grating engraved on the data page 13 and the interlaced images printed on the front cover 11 are configured to create an animation effect when the secure document 10 transitions from one opening configuration to another. Such an animation effect helps to improve security and reduce the risk of counterfeiting of such secure documents.

[0025] One drawback of the solution described in document WO 2020 / 030787 is that it is difficult to guarantee perfect parallelism between the outer edge of the data page 13 and the outer edge of the front cover 11, such a lack of parallelism being able to reach 2°.

[0026] Given that the printer generating the interlaced images on the front cover 11 uses the outer edge of this cover page as a reference, and that the orientation of the lenses constituting the optical grating is determined during the manufacturing of the data page 13, a misalignment between the interlaced images and the optical grating results, negatively impacting the rendering of each of these interlaced images when they are revealed by the optical grating. Such a misalignment can result in the appearance of an undesirable moiré effect. Description of the invention

[0027] The present invention aims to remedy all or part of the drawbacks of the prior art, in particular those described above, by proposing a solution that makes it possible to limit, or even reduce, the effects related to the existing lack of parallelism between the outer edge of the data page and the outer edge of the cover.

[0028] To this end, and according to a first aspect, the invention relates to a method for personalizing a secure document comprising at least three pages linked together by a hinge around which they can pivot,

[0029] a first page being at least partially covered by a personalization layer whose appearance can be modified by applying a laser beam,

[0030] a second page comprising at least one transparent window having at least one optical network arranged opposite the personalization layer,

[0031] said personalization process comprising: - the generation of a first image by applying, through said optical network, the laser beam to a first portion of the personalization layer, - the generation of a second image by applying, through said optical network, the laser beam to a second portion of the personalization layer, said optical network revealing the first image when the secure document is in a first opening configuration in which the first and second pages are tilted at a first angle relative to the third page, and revealing the second image when the secure document is in a second opening configuration in which the first and second pages are tilted at a second angle, distinct from the first, relative to the third page, the second page shifting in a direction orthogonal to the hinge relative to the first page when moving from the first opening configuration to the second opening configuration.

[0032] It should be noted that the expression "personalize a secure document" refers to the process of creating a unique identification document specific to each individual, such as an identity card, passport, or driver's license, which contains personal and / or biometric information specific to a given person. In other words, the personalization of a secure document aims to guarantee its uniqueness and to ensure the security and authenticity of the information it contains.

[0033] To this end, the personalization of an identity document generally involves the following steps: - collection of an individual's personal information, such as their name, date of birth, address, photograph, fingerprints, etc., by a competent authority, - verification and validation of information by the competent authority, - design and production of the secure document by printing the information personal training of the individual, and / or encoding of this information in an integrated electronic chip, and / or addition of security elements such as holograms or special inks, etc.

[0034] Thus, the method according to the invention advantageously overcomes the lack of parallelism existing between the outer edge of the data page and the outer edge of the corresponding cover page, which negatively impacts the rendering of a security element—in this case, interlaced images—printed on the cover page when viewed through the data page window. Put another way, the method according to the invention makes it possible to homogenize the rendering of this security element despite this lack of parallelism existing between the outer edge of the data page and the outer edge of the corresponding cover page when the secure document is opened or closed.

[0035] In particular embodiments, with the secure document positioned in the first opening configuration, the first image is generated by applying the laser beam in a direction orthogonal to the surface of the second page, and

[0036] with the secure document positioned in the second opening configuration, the second image is generated by applying the laser beam in a direction orthogonal to the surface of the second page.

[0037] When personalizing the secure document according to these embodiments, the orientation of the laser beam is fixed. Specifically, the laser beam is first focused on the pixels of the first pixel matrix when the secure document is in the first opening configuration and then on the pixels of the second pixel matrix when the secure document is in the second opening configuration, thus enabling the generation of interlaced images.

[0038] In specific implementation modes, the secure document is positioned in a given opening configuration:

[0039] The first image is generated by applying the laser beam in a direction forming a first angle of incidence with respect to the surface of the second page, the laser beam being focused on the first portion of the personalization layer, and

[0040] The second image is generated by applying the laser beam in a direction forming a second angle of incidence, distinct from the first angle of incidence, with respect to the surface of the second page, the laser beam being focused on the second portion of the personalization layer.

[0041] When customizing the secure document according to these embodiments, the opening configuration of the secure document is fixed. For example, it may be an opening configuration in which the first and second pages are superimposed and form a right angle with the third page. Other configurations Various opening configurations are possible in order to meet the constraints of the personalization system used.

[0042] In particular embodiments, the generation of the first and second image is carried out by ablation of material on the first portion or on the second portion of the personalization layer.

[0043] Interlaced images are obtained by total or partial ablation of the material constituting the personalization layer.

[0044] According to a particular embodiment described above, the personalization layer is a metallic sheet.

[0045] The interlaced images obtained by total or partial ablation of the metal constituting the personalization layer are monochrome images with a color dominance corresponding to the tint of the metal sheet.

[0046] According to this particular feature, the metal sheet comprises one of the materials included in the following list:

[0047] - or,

[0048] - silver,

[0049] - aluminum,

[0050] - alloy of at least two metals.

[0051] According to another feature of the embodiments described above, the personalization layer comprises a holographic structure including a first pixel matrix corresponding to the first portion of the personalization layer and a second pixel matrix corresponding to the second portion of the personalization layer, the first pixel matrix and the second pixel matrix having a plurality of sub-pixels of distinct colors, the ablation of material allowing the color of the pixels to be selected by modifying the contribution of the sub-pixels to each other for at least a part of the sub-pixels.

[0052] Interlaced images obtained by total or partial ablation of the holographic structure are high-luminosity polychrome images. Such interlaced images have the advantage of being secure and resistant to falsification.

[0053] In particular embodiments the generation of the first and second image is carried out by carbonization of the personalization layer.

[0054] According to a particular embodiment described above, the personalization layer comprises a monochrome organic underlayer covered with a polymer layer, the carbonization of certain parts of the polymer layer revealing shades of grey.

[0055] The polymer layer covering the organic sub-layer is special in that it blackens at the point where it is struck by the laser beam. The level of opacity obtained at such a point of the customization layer is a function of the intensity of the laser beam and / or duration of exposure to laser radiation.

[0056] According to another feature of the embodiments described above, the personalization layer comprising a first pixel matrix corresponding to the first portion of the personalization layer and a second pixel matrix corresponding to the first portion of the personalization layer, the first pixel matrix and the second pixel matrix have a plurality of sub-pixels of distinct colors and are covered with a polymer layer, the carbonization of certain parts of the polymer layer allowing the color of the pixels to be selected by modifying the contribution of the sub-pixels to each other for at least a part of the sub-pixels.

[0057] Here too, the polymer layer covering the organic sublayer blackens at the point where it is struck by the laser beam. A point on the polymer layer blackened by the laser can mask a point of color proportionally to the intensity of the laser beam and / or the duration of exposure to the laser radiation. Thus, the points opacified by application of the laser beam selectively mask certain subpixels so as to express a hue by combining the unmasked base colors.

[0058] In particular embodiments, the sub-pixels are arranged in parallel monochrome bands.

[0059] According to a second aspect, the invention relates to a secure document comprising at least three pages linked together by a hinge around which they can pivot,

[0060] a first page being at least partially covered by a personalization layer whose appearance can be modified by applying a laser beam,

[0061] a second page comprising at least one transparent window having at least one optical network arranged opposite the personalization layer,

[0062] said optical network being intended to reveal:

[0063] when the secure document is in a first opening configuration in which the first and second pages are inclined at a first angle relative to the third page, a first image generated by applying, through said optical network, the laser beam to a first portion of the personalization layer, and

[0064] when the secure document is in a second opening configuration in which the first and second pages are tilted at a second angle, distinct from the first, relative to the third page, the second page having shifted in a direction orthogonal to the hinge relative to the first page during the transition from the first opening configuration to the second opening configuration, a second image generated by applying, through said optical network, the laser beam to a second portion of the personalization layer.

[0065] It should be noted that an optical network designates a pattern repeated according to a step.

[0066] In particular embodiments, in which the optical network consists of a set of parallel lines.

[0067] By way of example, a network comprises a plurality of lines, straight or curved, parallel to each other, two neighbouring lines being separated from each other by a distance called "step".

[0068] In particular embodiments, the constituent lines of the optical network are parallel to the hinge.

[0069] In particular embodiments, the lines constituting the optical network are orthogonal to the hinge.

[0070] In particular embodiments, the personalization layer is hot-glued onto the first page.

[0071] Hot-stamping the personalization layer onto the first page increases the adhesion between the personalization layer and the first page. Since secure documents have a fairly long lifespan, on the order of several years, their integrity is ensured over time.

[0072] In particular embodiments, the customization layer is a metallic foil.

[0073] In particular embodiments, the customization layer comprises a monochrome organic underlayer covered with a polymer layer.

[0074] In particular embodiments the personalization layer comprises a holographic structure including a first pixel matrix corresponding to the first portion of the personalization layer and a second pixel matrix corresponding to the second portion of the personalization layer, the first pixel matrix and the second pixel matrix having a plurality of sub-pixels of distinct colors, material ablation allowing the color of the pixels to be selected by modifying the contribution of the sub-pixels to each other for at least a part of the sub-pixels.

[0075] According to one embodiment, the personalization layer may comprise a first sublayer consisting of a page on which the first pixel array and the second pixel array are printed, covered by a second polymer sublayer protecting the pixel arrays from external damage, itself covered by a third metallic sublayer. Since a pixel in a pixel array consists of a plurality of subpixels, ablation of material from the metallic sublayer by application of the laser beam makes it possible to select the color of a pixel by modifying the contribution of the constituent subpixels relative to each other for at least some of the subpixels.

[0076] In particular embodiments, the personalization layer comprising a first pixel matrix corresponding to the first portion of the personalization layer and a second pixel matrix corresponding to the first portion of the personalization layer, the first pixel matrix and the second pixel matrix have a plurality of sub-pixels of distinct colors and are covered with a polymer layer, laserizing certain parts of the polymer layer allowing the color of the pixels to be selected by modifying the contribution of the sub-pixels to each other for at least a part of the sub-pixels.

[0077] In particular embodiments, the personalization layer comprising a first pixel matrix corresponding to the first portion of the personalization layer and a second pixel matrix corresponding to the first portion of the personalization layer, the first pixel matrix and the second pixel matrix have identical color sets.

[0078] Here the interlaced images present the same set of colours.

[0079] In particular embodiments, the first pixel matrix and the second pixel matrix exhibit distinct color sets.

[0080] Such a configuration simplifies the verification of the authenticity of the secure document, each of the interlaced images being identifiable by its set of colours.

[0081] In particular embodiments, the sub-pixels are arranged in parallel monochrome bands.

[0082] In particular embodiments, the monochrome bands are oriented perpendicular to the lines of said optical network.

[0083] In particular embodiments, the personalization layer is deposited on a polymer material layer previously hot-deposited on the second page.

[0084] Bonding a layer of polymer hot to another surface offers several advantages. Among these, strong adhesion to the surface on which it is deposited can be noted:

[0085] In particular embodiments, the polymer material layer is a polycarbonate layer.

[0086] A polymer such as polycarbonate, when heated and applied to a surface, tends to form a strong chemical bond with that surface. This creates a strong adhesion, meaning that the polycarbonate layer will stay in place and will not easily detach.

[0087] In particular embodiments, the secure document is a passport whose first page is a cover page and the second page is a data page containing identification data of a passport holder.

[0088] According to a third aspect, the invention relates to a secure document set comprising a plurality of secure documents as described above.

[0089] According to a fourth aspect, the invention relates to a method for authenticating a secure document as described above, said authentication method comprising:

[0090] - detection, when the secure document is in the first configuration observation, of the first image, and

[0091] - detection, when the secure document is in the second configuration observation, of the second image.

[0092] Such a procedure can be implemented by an agent, whether sworn or not, who needs to verify the authenticity of such a secure document and the identity of its holder, for example, to validate a payment transaction or to authorize a border crossing between two territories. Such a procedure can also be implemented automatically without the need for any agent intervention.

[0093] In particular embodiments, the secure document is viewed along a direction orthogonal to the surface of the second page:

[0094] The first observation configuration is a configuration in which the secure document is positioned in the first opening configuration, and

[0095] the second observation configuration is a configuration in which the secure document is positioned in the second opening configuration.

[0096] In specific implementation modes, the secure document is positioned in a given opening configuration:

[0097] The first observation configuration is a configuration in which the secure document is observed along a direction forming a first angle of incidence with respect to the surface of the second page, and

[0098] The second observation configuration is a configuration in which the secure document is observed in a direction forming a second angle of incidence, distinct from the first angle of incidence, with respect to the surface of the second page.

[0099] According to a fifth aspect, the invention relates to a secure document authentication system as described above, comprising:

[0100] - acquisition means configured to acquire the first image when the The secure document is in the first observation configuration, and to acquire the second image when the secure document is in the second observation configuration, and

[0101] - display means configured to display the first image and the second picture.

[0102] Such a system does not necessarily require the intervention of an operator who views the first and second images on a screen. Indeed, the displayed interlaced images can be analyzed using automatic image analysis methods. Such image analysis methods may have been previously trained using machine learning models developed for this purpose. However, such aspects, related to the present invention, will not be described in further detail. Brief description of the drawings

[0103] Other features and advantages of the present invention will become apparent from the description below, with reference to the accompanying drawings, which illustrate an example of an embodiment without being limiting in any way. In the figures:

[0104] [Fig.1] [Fig.1] represents a secure document in the form of a booklet;

[0105] [Fig.2A], [Fig.2B], [Fig.2C], [Fig.2D] Figures 2A to 2D illustrate a document of state-of-the-art security,

[0106] [Fig.3] [Fig.3] schematically represents a secure document presented as the shape of a booklet as well as the offset existing between any page of the booklet and a cover page;

[0107] [Fig.4] [Fig.4] represents a cross-section of the secure document that is the subject of the invention along axis II,

[0108] [Fig.5] [Fig.5] represents two interlaced portions of the persona layer lisation,

[0109] [Fig.6] [Fig.6] represents two interlaced images obtained according to the per process sonalisation, the object of the invention,

[0110] [Fig.7A], [Fig.7B] Figures 7A and 7B represent a first mode of persona scanning a secure document,

[0111] [Fig.8A], [Fig.8B] Figures 8A and 8B represent a second mode of persona scanning a secure document,

[0112] [Fig.9] [Fig.9] represents a holographic structure used to personalize a secure document,

[0113] [Fig. 10] [Fig. 10] represents a secure document authentication system obtained according to the personalization process that is the subject of the present invention,

[0114] [Fig. 11 A], [Fig. 1 IB] Figures 11A and 1 IB represent a second mode authentication of a secure document,

[0115] [Fig.12A], [Fig.12B] Figures 12A and 12B represent a second method of authentication of a secure document.

[0116] Identical references shown in the aforementioned figures are identified by identical numerical references. Description of implementation methods

[0117] The present invention aims to limit, or even reduce, the effects related to the lack of parallelism existing between the outer edge of the data page and the outer edge of the cover of a secure booklet-type document.

[0118] For the remainder of the description, the secure document 10 is considered, without limitation, to be a passport such as that described with reference to [Fig.1].

[0119] As mentioned previously, such a secure document 10 comprises a front cover page 11 and a back cover page 12, as well as a data page 13 preceded by at least one page 14 that may belong to a booklet comprising a plurality of pages. The data page 13 further comprises at least one transparent window 16 with an optical network 18. In other embodiments, the page 14 may follow the data page 13 instead of preceding it.

[0120] With reference to [Fig. 4], page 14 of the secure document is covered by a personalization layer 19 whose appearance can be modified by applying a laser beam. In this [Fig. 4], the secure document is cut according to the cutting plane II introduced with reference to [Fig. 3].

[0121] By way of example, the personalization layer 19 can cover the entire surface of page 14. Alternatively, the personalization layer 19 can simply cover a limited area of ​​page 14. In such a case, the area of ​​page 14 covered by the personalization layer 19 is located opposite the window 16 made in the data page 13. Advantageously, such an area of ​​page 14 covered by the personalization layer 19 can have dimensions slightly larger than those of the window 16, which ensures that the optical network 18 is correctly arranged on the surface to be observed.

[0122] In the remainder of this document, the application of a laser beam means scanning the surface of the personalization layer 19 with the laser beam. The radiation intensity of this laser beam and the exposure time of the surface to be treated depend on the material constituting the personalization layer 19 and the desired personalization effect.

[0123] Laser scanning is a known technique consisting of moving a laser beam in a controlled and precise manner in one or more directions to perform various tasks, in this case personalizing the secure document 10.

[0124] The fundamental principle of laser scanning relies on the use of a mirror or a system of galvanometric mirrors to direct the laser beam in different directions. These mirrors are generally controlled by electric motors or piezoelectric systems that allow for rapid and precise movement.

[0125] More specifically, the personalization layer 19 is cut into minus two interlaced portions. Such an interlacing of a first portion 20 and a second portion 30 is shown in [Fig. 5]. The first portion 20 comprises, by way of example, seven lines 21 to 27 interlaced with the seven lines 31 to 37 of the second portion 30. Those skilled in the art will understand that these are examples given for informational purposes only and are not exhaustive; portions 20 and 30 may contain as many lines as necessary.

[0126] In order to reduce the effects related to the existing lack of parallelism between the outer edge of the data page 13 and the outer edge of the page 14, the inventors of the present solution propose to personalize the secure document 10 by applying the laser beam to the surface of the personalization layer 19 through the optical grating 18. By doing so, it is then possible to overcome, at least partially, the existing lack of parallelism between the outer edge of the data page 13 and the outer edge of the page 14, the latter being corrected when the laser beam passes through the optical grating 18.

[0127] Thus, the process of personalizing the secure document 10 includes a step of generating a first image by applying, through the optical network 18, the laser beam to a first portion 20 of the personalization layer 19 and then a step of generating a second image by applying, again through said optical network 18, the laser beam to a second portion 30 of the personalization layer 19. During the generation of these two interlaced images, the data page 13 and the page 14 are superimposed in order to allow the transmission of the laser beam through the optical network.

[0128] Figure 6 shows two interlaced images 29 and 39 obtained by means of the personalization process of the present invention. Image 29 represents the number 1 and is obtained by applying the laser beam to the portion 20 of the personalization layer 19. Image 39 represents the number 2 and is obtained by applying the laser beam to the portion 30 of the personalization layer 19.

[0129] The image 29 is revealed by the optical network 18 when the secure document 10 is in a first opening configuration in which the data page 13 and the page 14 are inclined at a first angle with respect to the rear cover 12.

[0130] Image 39 is, for its part, revealed by optical network 18 when the secure document 10 is in a second opening configuration in which the data page 13 and page 14 are inclined at a second angle, distinct from the first, relative to the rear cover 12, the data page 13 shifting in a direction orthogonal to the hinge 15 relative to page 141 during the transition from the first opening configuration to the second opening configuration.

[0131] Images 29 and 39 can also be revealed by the optical network 18 without a change in the opening configuration of the secure document 10 having occurred necessary. Indeed, it is possible to reveal images 29 and 39 by changing the observation direction of data page 13 as will be described in more detail in figures 12A and 12B.

[0132] There are several solutions for generating interlaced images 29 and 39. In a first solution described in more detail with reference to Figures 7A and 7B, the orientation of the laser beam is fixed and the interlaced images 29 and 39 are obtained by acting on the secure document 10. In a second solution described in more detail with reference to Figures 8A and 8B, the secure document 10 is in a given opening configuration and the orientation of the laser beam is modified.

[0133] Figures 7A and 7B schematically represent a first system for generating interlaced images using a laser beam. Such a system includes a laser beam generation module M. Such modules are well known to those skilled in the art. The system also includes a support S on which the secure document 10 is placed. In such a system, the orientation of the laser beam F is fixed, i.e., it remains the same throughout the personalization operations of the secure document 10. In the example shown in Figures 7A and 7B, the laser beam F is oriented in a direction orthogonal to the surface of the data page 13. All the elements shown in Figures 7A and 7B are cut along the cutting plane II introduced with reference to Figure 3.

[0134] With reference to [Fig.7A], the secure document 10 is arranged on the support S according to a first opening configuration in which there is an offset "d" between page 14 and data page 13. The laser beam F then scans in an orderly fashion the different lines 21, 22, 23, 24, 25 of the first portion 20 through the optical grating 18. More particularly, in [Fig.7A], the laser beam F scans line 22.

[0135] Once the first image 29 is generated, the secure document 10 is placed on the support S in a second opening configuration, as shown in [Fig. 7B]. In this second opening configuration, there is no offset between page 14 and data page 13. The laser beam F then systematically scans the different lines 31, 32, 33, 34 of the second portion 30 through the optical grating 18. More specifically, in [Fig. 7B], the laser beam F scans line 32. Following this scan, the second image 39 is generated. If a third image were to be generated because the personalization layer was divided into three interlaced portions, then the secure document 10 would be placed in a third opening configuration (not shown in the figures), and the laser beam F would scan the lines of this third portion to generate the third image.

[0136] Figures [Fig. 8A] and [Fig. 8B] schematically represent a second system enabling the generation of interlaced images by means of a laser beam. Such a system includes a laser beam generation module M. Such modules are well known to those skilled in the art. The system S also includes a support S on which the secure document 10 is placed. In such a system, the orientation of the laser beam F is adjustable. In the example shown in [Fig. 8A], the laser beam F is oriented in a first direction in which it scans the lines of the first portion 20. In the example shown in [Fig. 8B], the laser beam F is oriented in a second direction in which it scans the lines of the second portion 30. All the elements shown in Figures 8A and 8B are cut according to the cutting plane II introduced with reference to [Fig. 3].

[0137] With reference to [Fig.8A], the secure document 10 is arranged on the support S according to a first opening configuration in which there is no offset between page 14 and data page 13. The laser beam F, inclined along a first direction 01 with respect to a normal to the surface of data page 13, then scans in an orderly fashion the different lines 21, 22, 23, 24, 25 of the first portion 20 through the optical grating 18. More particularly, in [Fig.8A], the laser beam F scans line 22.

[0138] Once the first image 29 is generated, the laser beam F, inclined along a second direction 02 with respect to a normal to the surface of the data page 13, then systematically scans the different lines 31, 32, 33, 34 of the second portion 30 through the optical grating 18. More specifically, in [Fig. 8B], the laser beam F scans line 32. Following this scan, the second image 39 is generated. If a third image were to be generated because the personalization layer were divided into three interlaced portions, then the laser beam F would be inclined along a third direction 03 (not shown in the figures) with respect to a normal to the surface of the data page 13 and would scan the lines of this third portion in order to generate the third image.

[0139] There are several ways to use the F laser beam to generate interlaced images such as images 29 and 39. Among these possibilities, material ablation of the personalization layer 19 and carbonization of the personalization layer 19 are particularly noteworthy. A person skilled in the art may, of course, suggest other uses of an F laser beam leading to the generation of interlaced images 29 and 39, such as perforation of the personalization layer 19.

[0140] As indicated above, it is possible to use the laser beam F to remove all or part of the material constituting the personalization layer 19 in order to generate the interlaced images 29 and 39. More specifically, when the laser beam F scans the lines of a portion of the personalization layer 19, it will, depending on the image to be displayed, remove, partially or totally, the material constituting the personalization layer 19 covering one or more areas belonging to the line of the portion it scans.

[0141] In this example of use of the laser beam F, the customization layer 19 can be a thin metallic or "foil" layer, on the order of tens to hundreds of micrometers thick. This metallic layer can comprise gold, silver, aluminum, or any alloy of two metals.

[0142] Still in this example of the use of the laser beam F, namely the ablation of material from the personalization layer, the personalization layer 19 may have a holographic structure. Such a holographic structure comprises a first pixel matrix 20 corresponding to the first portion 20 of the personalization layer 19 and a second pixel matrix 30 corresponding to the second portion 30 of the personalization layer. The first pixel matrix 20 and the second pixel matrix 30 each have a plurality of sub-pixels of distinct colors. Such a holographic structure is shown in [Fig. 9].

[0143] More specifically, the holographic layer 40 comprises a layer 41 and reliefs 42, containing three-dimensional information, which are formed from the layer 41 serving as a support. These reliefs 42 form protruding portions separated by recesses.

[0144] The holographic layer 41 further comprises a layer 43, called the "high refractive index layer", which has a refractive index n2 greater than the refractive index ni of the reliefs 42. This layer 43, which can be a metallic and / or dielectric layer, covers the reliefs 42 of the holographic layer 12. As understood by those skilled in the art, the reliefs 42 in combination with the layer 43 form a holographic structure 44 which produces a hologram.

[0145] The reliefs 42 of the holographic structure 44 can be formed, for example, by embossing a layer of stamping varnish in a manner known for producing diffring structures. The embossed surface of the reliefs 42 thus has a periodic lattice shape whose depth and period can be, respectively, on the order of hundreds to a few hundred nanometers, for example. This embossed surface is coated with the layer 43, for example, by vacuum deposition of a transparent dielectric material and / or a metallic material. The holographic effect results from the combination of the reliefs 42 and the layer 43, forming the holographic structure 44.

[0146] The holographic layer 12 may optionally include other sub-layers (not shown) necessary to maintain the optical characteristics of the hologram and / or to ensure mechanical and chemical resistance of the assembly.

[0147] Such a holographic structure is described in more detail in patent application FR 3 093 302 Al filed in the name of the Applicant.

[0148] As mentioned above, it is possible to use the F laser beam to carbonize the personalization layer 19. Laser carbonization is a process that consists of blackening a given area of ​​a surface to a greater or lesser degree. By blackening these areas to a greater or lesser degree, an image can be generated.

[0149] In such an example of use of the laser beam F, when it scans the lines of a portion of the personalization layer 19, it will, depending on the image to be displayed, partially or totally opacify the material constituting the personalization layer 19 covering certain areas belonging to the line of the portion it scans.

[0150] The interlaced images 29 and 39 thus obtained can be grayscale images when the personalization layer 19 comprises a monochrome organic sublayer covered with a polymer layer having the property of becoming opaque when a laser beam is applied to it. Thus, scanning the portions 20 and 30 with the laser beam F reveals grayscale levels that allow images 29 and 39 to be discerned.

[0151] The interlaced images 29 and 39 can also be color images. To obtain such color images, the customization layer 19 comprises a first pixel matrix 20, corresponding to the first portion 20, and a second pixel matrix 30, corresponding to the second portion 30, each pixel of these pixel matrices 20 and 30 constituting the customization layer 19 comprising, for example and without limitation, quadruplets of subpixels of red, green, blue, and white. The subpixels can also be aligned to form monochrome bands in the colors described above. The pixel matrix 20 and the pixel matrix 30 can have the same color sets or distinct color sets.

[0152] The ink used to print these sub-pixels is preferably a reflective ink. Such a personalization layer 19 is described in particular in patent referenced EP 2 580 065 B1 in the name of the Applicant.

[0153] Regardless of the embodiment considered, the personalization layer 19 can also be deposited on a polymer material layer previously hot-deposited on page 14. This allows for better adhesion of the personalization layer 19 to page 14.

[0154] The present solution also relates to a method and system for authenticating a secure document 10 obtained according to the present invention.

[0155] As explained above, such an identification method comprises the following steps:

[0156] - detection, when the secure document 10 is in a first confi observation figure, of the first interlaced image 29, and

[0157] - detection, when the secure document 10 is in a second confi observation figure, of the second interlaced image 39.

[0158] Such an identification method can be implemented by an agent, whether sworn or not, who needs to verify the authenticity of such a secure document and the identity of its holder, for example, to validate a payment transaction or to authorize border crossings between two territories. Such a process can also be implemented automatically without the need for any agent intervention.

[0159] In the case of an automatic implementation of the authentication method, it is executed within an authentication system represented in [Fig. 10].

[0160] Such a system 50 comprises acquisition means 51, such as one or more cameras (a single camera is shown in [Fig. 10]) capable of capturing still images or videos. The system 50 is configured to acquire the first image 29 when the secure document 10 is in a first viewing configuration and to acquire the second image 39 when the secure document 10 is in a second viewing configuration.

[0161] Finally, the system 50 includes display means 52 configured to display the first image 29 and the second image 39. Such display means 52 may be in the form of a computer screen, for example, or a tablet, and thus allow an agent to view the interlaced images 29 and 39 one after the other or simultaneously.

[0162] There are several ways to capture the interlaced images 29 and 39. In a first solution described in more detail with reference to Figures 11A and 11B, the orientation of the camera 51 is fixed and the interlaced images 29 and 39 are obtained by acting on the secure document 10. In a second solution described in more detail with reference to Figures 12A and 12B, the secure document 10 is in a given opening configuration and the orientation of the camera 51 is changed.

[0163] With reference to [Fig. 11 A] and [Fig. 1 IB], the orientation of the camera 51 is fixed, that is to say, it remains the same throughout the authentication operations of the secure document 10. In the example shown in Figures 11A and 11B, the camera 51 is oriented in a direction orthogonal to the surface of the data page 13. All the elements shown in Figures 11A and 11B are cut according to the cutting plane II introduced with reference to [Fig. 3].

[0164] With reference to [Fig. 11 A], the secure document 10 is arranged according to a first opening configuration in which there is an offset "d" between page 14 and data page 13. The camera 51 acquires an image of the interlaced image 29.

[0165] Once the first image 29 has been acquired, the secure document 10 is arranged in a second opening configuration, as shown in [Fig. IIB]. In this second opening configuration, there is no offset between page 14 and data page 13. The camera 51 acquires an image of the interlaced image 39.

[0166] With reference to [Fig. 12A] and [Fig. 12B], the camera 51 is oriented in a first direction and acquires an image of the first interlaced image 29. In the example shown in [Fig. 12B], the camera 51 is oriented in a second direction in which it acquires an image of the second interlaced image 39. All the elements shown in Figures 12A and 12B are cut along the cutting plane II introduced with reference to [Fig. 3].

[0167] With reference to [Fig.12A], the secure document 10 is arranged according to a first opening configuration in which there is no offset between page 14 and data page 13. The camera 51, inclined in a first direction 03 with respect to a normal to the surface of data page 13, acquires an image of the first interlaced image 29 through the optical grating 18.

[0168] Once the first image 29 has been acquired, the camera 51, or a second camera having a distinct orientation from the camera that acquired the image of the first interlaced image 29, inclined along a second direction 04 with respect to a normal to the surface of the data page 13, acquires an image of the second interlaced image 39 through the optical grating 18.

[0169] The images 29 and 39 thus acquired are then displayed on the display means 52.

Claims

Claims

1. . Method for personalizing a secure document (10) comprising at least three pages (12, 13, 14) connected together by a hinge (15) around which they can pivot, a first page (14) being at least partially covered by a personalization layer (19) whose appearance can be modified by applying a laser beam (F), a second page (13) comprising at least one transparent window (16) comprising at least one optical network (18) arranged opposite the personalization layer (19), said personalization method comprising: - the generation of a first image (29) by application, through said optical network (18), of the laser beam (F) on a first portion (20) of the personalization layer (19), - the generation of a second image (39) by application, through said optical network (18), of the laser beam (F) on a second portion (30) of the personalization layer (19), said optical network (18) revealing the first image (29) when the secure document (10) is in a first opening configuration in which the first and second pages (13, 14) are inclined at a first angle (a) relative to the third page (12), and revealing the second image (39) when the secure document (10) is in a second opening configuration in which the first and second pages (13, 14) are inclined at a second angle, distinct from the first, relative to the third page (12), the second page (13) shifting in a direction orthogonal to the hinge (15) relative to the first page (14) when passing from the first opening configuration to the second opening configuration.

2. . A personalization method according to claim 1, wherein: the secure document (10) being positioned in the first opening configuration, the first image (29) is generated by applying the laser beam (F) in a direction orthogonal to the surface of the second page (13), and the secure document being positioned in the second configuration opening, the second image (39) is generated by applying the laser beam (F) in a direction orthogonal to the surface of the second page (13).

3. . Personalization method according to claim 1, wherein the secure document being positioned in a given opening configuration: the first image (29) is generated by applying the laser beam (F) in a direction forming a first angle of incidence (01) relative to the surface of the second page (13), the laser beam being focused on the first portion (20) of the personalization layer (19), and the second image (39) is generated by applying the laser beam (F) in a direction forming a second angle of incidence (02), distinct from the first angle of incidence (01), relative to the surface of the second page (13), the laser beam (F) being focused on the second portion (30) of the personalization layer (19).

4. . Personalization method according to one of claims 1 to 3, in which the generation of the first (29) and the second image (39) is carried out by ablation of material on the first (20) or on the second portion (30) of the personalization layer (19).

5. . A personalization method according to claim 4, wherein the personalization layer (19) is a metal foil.

6. . Personalization method according to claim 5, in which the metal sheet comprises one of the set of materials included in the following list: - gold, - silver, - aluminum, - alloy of at least two metals.

7. . The personalization method of claim 4, wherein the personalization layer (19) comprises a holographic structure (44) comprising a first pixel matrix corresponding to the first portion (20) of the personalization layer (19) and a second pixel matrix corresponding to the second portion (30) of the personalization layer (19), the first pixel matrix and the second pixel matrix comprising a plurality of sub-pixels of distinct colors, the ablation of material making it possible to select the color of the pixels by modifying the contribution of the sub-pixels to each other. compared to others for at least some of the subpixels.

8. . A personalization method according to any one of claims 1 to 3, wherein the generation of the first (29) and the second image (39) is carried out by carbonization of the personalization layer (19).

9. . A personalization method according to claim 8, wherein the personalization layer (19) comprises a monochrome organic underlayer covered with a polymer layer, the carbonization of certain parts of the polymer layer causing gray levels to appear.

10. . The personalization method of claim 8, wherein the personalization layer (19) comprises a first pixel matrix corresponding to the first portion (20) of the personalization layer (19) and a second pixel matrix corresponding to the first portion of the personalization layer (19), the first pixel matrix and the second pixel matrix comprise a plurality of sub-pixels of distinct colors and are covered with a polymer layer, the carbonization of certain parts of the polymer layer making it possible to select the color of the pixels by modifying the contribution of the sub-pixels relative to each other for at least a part of the sub-pixels.

11. . A personalization method according to claim 10 or claim 7, wherein the sub-pixels are arranged in parallel monochrome stripes.

12. . Secure document (10) comprising at least three pages (12, 13, 14) connected together by a hinge around which they can pivot, a first page (14) being at least partially covered by a personalization layer (19) whose appearance can be modified by applying a laser beam (F), a second page (13) comprising at least one transparent window (16) comprising at least one optical network (18) arranged opposite the personalization layer (19), said optical network (18) being intended to reveal: when the secure document (10) is in a first opening configuration in which the first and second pages (13, 14) are inclined at a first angle relative to the third page (12), a first image (29) generated by applying, through said optical network (18), of the laser beam (F) on a first portion of the personalization layer (19), and when the secure document (10) is in a second opening configuration in which the first and second pages (13, 14) are inclined at a second angle, distinct from the first, relative to the third page (12), the second page (13) having shifted in a direction orthogonal to the hinge (15) relative to the first page (14) during the transition from the first opening configuration to the second opening configuration, a second image (39) generated by application, through said optical network (18), of the laser beam (F) on a second portion of the personalization layer (19).

13. . Secure document (10) according to claim 12, in which the personalization layer (19) comprising a first pixel matrix corresponding to the first portion (20) of the personalization layer (19) and a second pixel matrix corresponding to the first portion of the personalization layer (19), the first pixel matrix and the second pixel matrix have identical color sets.

14. . Secure document (10) according to claim 12, wherein the personalization layer (19) is deposited on a layer of polymer material previously hot-deposited on the second page.

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