NL2020650B1 - Security document with array of parallel semi-cylindrical lenses - Google Patents

Security document with array of parallel semi-cylindrical lenses Download PDF

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Publication number
NL2020650B1
NL2020650B1 NL2020650A NL2020650A NL2020650B1 NL 2020650 B1 NL2020650 B1 NL 2020650B1 NL 2020650 A NL2020650 A NL 2020650A NL 2020650 A NL2020650 A NL 2020650A NL 2020650 B1 NL2020650 B1 NL 2020650B1
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NL
Netherlands
Prior art keywords
array
coating
transparent body
security document
semi
Prior art date
Application number
NL2020650A
Other languages
Dutch (nl)
Inventor
Rene Ten Velden Ronald
Original Assignee
Idemia The Netherlands B V
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Publication date
Application filed by Idemia The Netherlands B V filed Critical Idemia The Netherlands B V
Priority to NL2020650A priority Critical patent/NL2020650B1/en
Priority to PCT/NL2019/050177 priority patent/WO2019182447A1/en
Application granted granted Critical
Publication of NL2020650B1 publication Critical patent/NL2020650B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/342—Moiré effects
    • 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
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials

Abstract

Substantially rigid security document comprising a substrate and a security element provided on the substrate, comprising: a coating on the substrate and adapted for providing a viewing angle dependent color-shifting effect; a substantially transparent body of a plastic material 5 arranged such that the coating is located between the substrate and the transparent body and can be viewed through the transparent body, the transparent body comprising a first lens portion with a first array of parallel semi-cylindrical lenses through which a first portion of the coating can be viewed, and a second lens portion with a second array of parallel semi-cylindrical lenses through which a second portion ofthe coating can be viewed, wherein the second array is angularly offset 10 with respect to the first array.

Description

Field of the invention
The present invention relates to a security document comprising a substrate and a security element provided on the substrate, wherein the substrate and security element thereon together have a thickness of 500 micrometer or more, the security element comprising a coating adapted for providing a viewing angle dependent color-shifting effect, wherein a substantially transparent body of a plastic material is provided at a view side of the coating and comprises an array of parallel semi-cylindrical lenses which form a lenticular lens. The width and length dimensions of the security document typically conform to those of a so called ID-1, ID-2 or ID-3 card as defined in the ISO/IEC 7810 specification of 2003. The document may be protected with a Basic Access Control and Secure Messaging (“BAC”) as defined in ICAO document ICAO9303 from 2015, and/or may be configured to comply with ISO/IEC 18013-3 using Basic Access Protocol (“BAP”). The security document according to the invention preferably is one of a passport, a government issued document or a driver’s license, or part thereof.
The invention further relates to a security element to be applied on a substrate of a security document, and to a method of applying a security element to a substrate of a security document.
Background art
US 2008/0191463 describes a composition comprising a transparent or semitransparent support and a layer comprising lenticular or linear Fresnel lenses on top of which a transparent or semi-transparent body with high refractive index (HRI), i.e. having a refractive index at least 0.1 higher than that of the layer with the lenticular or linear Fresnel lenses, is provided without destroying the effect of the lenticular or linear Fresnel lenses. The lenticular lenses may be extruded in a production direction or embossed on the transparent or semi-transparent support. On top of the HRI layer, different types of functional layers such as anti-scratch or conductive layers can be applied. The known composition was developed in view of the use of lenticular/linear Fresnel lenses to improve the security of an official security document such a PVC ID-card, a credit card or money (paper and plastic type). However, whether an observer can determine the authenticity of such a security document is highly dependent on a change in viewing angle of the observer to the security document, and for certain viewing angles the observer may be unable to determine the document’s authenticity at all.
It is an object of the present invention to provide a security document which is less dependent on a change in viewing angle between an observer and the security document to enable the observer to determine the authenticity of the document.
It is a further object to provide a security element for use with a security document, and a method of applying a security element onto a security document.
Summary of the invention
To this end, according to a first aspect, the present invention provides a security document comprising a substrate and a security element provided on the substrate, the security element comprising: a coating arranged on the substrate and adapted for providing a viewing angle dependent color-shifting effect; a substantially transparent body of a plastic material arranged such that the coating is located between the substrate and the transparent body and can be viewed through the transparent body, wherein the security document, along a line normal to the substrate and which extends through the coating, the substantially transparent body and the substrate, has a thickness of at least 500 micrometer; wherein the transparent body comprises a first lens portion with a first array of parallel semi-cylindrical lenses through which a first portion of the coating can be viewed, and a second lens portion with a second array of parallel semi-cylindrical lenses through which a second portion of the coating can be viewed, wherein the second array is angularly offset with respect to the first array; and wherein the semi-cylindrical lenses of the first and second array have a focal length of at least 10 micrometer, preferably at least 100 micrometer, more preferably at least 200 micrometer. Preferably at the angular offset is not a multiple of 90 degrees.
As the lenses of the first and second lens portion are at an angle to each other, i.e. nonparallel to each other, two different color-shifting effects of the coating may be visible to an observer at the same time through the lens portions. It is therefore unnecessary for the observer to change the viewing angle, i.e. the angle between the observer’s eyes and the document, to see the colorshifting effect of the coating when both the first and second lens portion are in his field of view. In case the observer does change the viewing angle, he may determine the authenticity of the security document based on the color-shifting effect observed through the first lens array and/or through the second lens array as the viewing angle is changed. Even if the change in viewing angle does not result in a visible color-shifting effect of the first portion of the coating viewed through the first lens portion, this change will likely result in a visible color-shifting effect in the second portion of the coating that is viewed through the second lens portion and vice versa. The thickness of the document in the vicinity of the coating of at least 500 micrometer helps prevent fold lines from occurring in the coating and in particular in the transparent body. Such fold lines would influence the transparency of the transparent body, e.g. by causing it to be opaque along the fold lines and obscuring the coating. Moreover, fold lines in card-shaped substrates of a security document should be generally avoided, in particular if the security document is to have predictable dimensions and/or comprises an electrical circuit.
The substantially transparent body preferably is arranged on the coating and more preferably extends over the entire coating and a portion of the substrate directly adjacent to the coating. In particular, the transparent body may extend such that, when seen in projection onto the substrate, it covers substantially the entire substrate.
In an embodiment the semi-cylindrical lenses of the first array have a first focal plane and the semi-cylindrical lenses of the second array have a second focal plane, wherein said first and second focal planes extend within a common plane that coincides with the coating. Preferably the surface of the coating facing the transparent body is substantially located within the common plane. As the lenses have their focal planes at or near the coating, a change in viewing angle typically results in a relatively extensive color-shifting effect being visible through at least one of the first and second lens portions. In this embodiment, the coating preferably has a substantially constant thickness. This allows the complete first and second coating portions to be applied to the substrate in a same coating deposition step.
In an alternative embodiment the semi-cylindrical lenses of the first array have a first focal plane and the semi-cylindrical lenses of the second array have a second focal plane, wherein the first portion of the coating is located within the first focal plane, and wherein the second portion of the coating is located within the second focal plane different from the first focal plane. Due to the differences in focal planes, different color-shifting effects are provided. Two portions of a same coating may lie in different focal planes, for instance when the first portion of the coating has thickness that is different from a thickness of the second portion of the coating. Alternatively, when the first and second portion of the coating lie in different planes, they may be connected to each other via an intermediate coating portion.
In a preferred embodiment, the coating is contiguous and preferably has a convex shape. The transparent body which comprises the lens portions preferably is also formed as a contiguous body, though it may comprise multiple transparent bodies stacked on top of each other.
The first focal plane and the second focal plane preferably are parallel to each other.
In an embodiment, the focal length of the first array of semi-cylindrical lenses differs from the focal length of the second array of semi-cylindrical lenses by at least 50 micrometer. For instance, the lenses of the first array may have a focal length of 300 micrometer, whereas the lenses of the second array may have a focal length 370 micrometer.
In an embodiment the first array of semi-cylindrical lenses and the second array of semicylindrical lenses at least partly abut each other. By arranging the first and second array close to each other, simultaneous observation of the color-shifting effect through the two lens portions is facilitated. Moreover, as it is difficult to produce lens arrays which are at an angle to each other when they abut each other, a security document according to this embodiment is difficult to counterfeit using standard available lenticular lenses.
In an embodiment the transparent body further comprises one or more further lens portions, each of said further lens portions comprising an array of parallel semi-cylindrical lenses which is angularly offset with respect to first and second array of semi-cylindrical lenses. Thus, besides the first and second lens portions, the transparent body may be provided with third, fourth and/or fifth lens portions. Preferably, the array of parallel semi-cylindrical lenses of each of the lens portions is at an angle to the arrays of lenses of all the other lens portions in the transparent body. More preferably, the first, second and one or more further lens portions together enclose a convex polygon, such as a triangle.
In an embodiment, the substantially transparent body further comprises one or more lensfree portions adjacent, preferably directly adjacent, to the first and/or second lens portion, wherein the one or more lens-free portions are substantially transparent and free from lenticular lenses. Preferably, at least a portion of the coating can be viewed by an observer through the one or more lens-free portions. The color-shifting effect of the coating can thus be viewed through these lensfree portions without being enhanced by lenticular lenses. When at least one of the one or more lens-free portions is a contiguous portion which surrounds the first and second portions, that lensfree portion provides some protection against damage to the first and second lens portions along the edges of these lens portions. Preferably, at least one of these lens-free portions is arranged in a convex polygon that is enclosed by the first, second and one or more further lens portions.
In an embodiment the substantially transparent body further comprises a portion with an array of concentric semi-cylindrical lenticular lenses. These concentric lenses, which preferably are substantially circular when seen in projection onto the substrate, provide a non-uniform colorshifting effect along the circumference of the lenses, i.e. within the portion of concentric lenses the coating may appear to an observer to have different colors. In contrast, the color-shifting effect for each array of parallel semi-cylindrical lenses is generally substantially uniform, i.e. within an array of parallel linear semi-cylindrical lenses the color of the coating viewed therethrough seems substantially the same.
In an embodiment the first and second array are angularly offset to each other by an angle in the range of 10 to 80 degrees, preferably in the range of 30 to 60 degrees. This angle is defined as the smallest angle between two lines parallel to the respective arrays when projected onto the substrate.
In an embodiment the coating comprises one or more of: an optically variable ink, liquid crystals, dichroic ink, iridescent ink and/or interference pigments. The observed color(s) of such a coating different within the visible light spectrum dependent on the viewing angle between the document and the observer. Herein, visible light is defined as light having a wavelength within the range of 350 - 780 nanometer.
In an embodiment the security document is substantially rigid. Preferably, the security element has a bending stiffness greater than 25 N/m when measured according to ISO/IEC 10373 of 2006. The bending modulus of the security document preferably is at least 2,3 GPa.
In an embodiment, the semi-cylindrical lenses of the first and/or second array have a pitch in the range of between 30 and 300 micrometer. The pitch is defined as centre-to-centre distance between adjacent ones of the parallel semi-cylindrical lenses.
In an embodiment the semi-cylindrical lenses of the first and/or second array have a thickness in the range of between 100 and 300 micrometer.
In an embodiment the substrate and the substantially transparent body are made from a same material, each preferably comprising or consisting of one or more layers of polycarbonate,
PVC (polyvinylchloride), ABS (acrylonitrile butadiene styrene), polyester, polyamide, polyimide, acrylic materials, and/or another plastic from the group of thermoplastics or thermosetting polymers.
In an embodiment the coating has an opacity of at least 30% for visible light, the opacity percentage preferably being defined according to ISO/IEC 10373 of 2006. More preferably, the coating has an opacity of at least 30% or at least 40%.
In an embodiment the substrate, at least in an area of projection of the coating on the substrate, is substantially opaque to visible light. Thus, the color-shifting effect of the coating is substantially invisible through the substrate. The substrate, at least in said area of projection, preferably has an opacity of at least 90%. This opacity may be determined in accordance with ISO/IEC 10373 of 2006.
According to a second aspect, the invention provides a security element for a substantially rigid security document, the security element comprising: a coating to be arranged on a substrate of the security document and adapted for providing a viewing angle dependent color-shifting effect; a substantially transparent body of a plastic material arranged at least partially on the coating such that the coating can be viewed through the transparent body; wherein the transparent body comprises a first lens portion with a first array of parallel semi-cylindrical lenses through which a first portion of the coating can be viewed, and a second lens portion with a second array of parallel semi-cylindrical lenses through which a second portion of the coating can be viewed, wherein the second array is angularly offset with respect to the first array; and wherein the semi-cylindrical lenses of the first and second array have a focal length of at least 80 micrometer, preferably at least 200 micrometer. It will be understood that those features of the security element described herein with reference to the first aspect of the invention may also be part of the security element.
According to a third aspect, the invention provides a method of applying a security element on a substrate of a security document, comprising the steps of:
- applying a coating on a portion of the substrate, wherein the coating is adapted for providing a viewing angle dependent color-shifting effect;
- applying a substantially transparent plastic body on the coating and on at least part of the substrate, such that the coating is located between the substrate and the transparent body and can be viewed through the transparent body, the security document, along a line normal to the substrate and which extends through the coating, the substantially transparent body and the substrate, having a thickness of at least 500 micrometer;
- providing a first lens portion and a second lens portion in said transparent body, the first lens portion having a first array of parallel semi-cylindrical lenses through which a first portion of the coating can be viewed, and the second lens portion having a second array of parallel semicylindrical lenses through which a second portion of the coating can be viewed, wherein the second array is angularly offset with respect to the first array, wherein the semi-cylindrical lenses of the first and second array have a focal length of at least 80 micrometer, preferably at least 200 micrometer. The resulting security document has at least two arrays of semi-cylindrical lenses which are at an angle to each other, enabling an observer to easily observe a color-shifting effect of the coating through the first and/or second lens portions.
Preferably the method results in a security document according to the first aspect of the invention.
In an embodiment, wherein the step of applying the transparent body is performed prior to the step of providing the first and second lens portions in said transparent body. This avoids having to accurately align the transparent body on the substrate.
In an embodiment, the step of providing the first and second lens portions in the transparent body comprises forming said first and second lens portions in said transparent body by pressing a die which comprises complementary shapes of the first and second lens portions into the body.
Short description of drawings
The present invention will be discussed in more detail below, with reference to the attached drawings, in which:
Fig. 1A shows a top view of an ID-card provided with a security element, according to the invention,
Figs. 1B and 1C show respective cross-sectional views of the ID-card of Fig. 1A along lines IB and IC,
Figs. 2A and 2B show respectively a top view and a cross-sectional view of an ID-card provided with a second embodiment of a security element according to the invention,
Figs. 3A and 3B show respectively a top view and a cross-sectional view of an ID-card provided with a third embodiment of a security element according to the invention,
Figs. 4A and 4B schematically illustrates different dimensional properties of a known semicylindrical lenticular lens, such as arc length, focal length, arc radius, gauge and width of the lens,
Figs. 5A-5C schematically show cross-sectional views of further variations of a security document according to the invention.
In the figures, like reference numbers refer to like structures.
Description of embodiments
Figs. 1A, 1B and 1C respectively show a top view of a security document 1, here an ID-1 card, provided with a security element 2 according to the invention, and a cross-sectional views along lines l-B and l-C of Fig. 1A. The security element 2 is arranged on an opaque substrate 10 of the ID card 1 and is provided with a coating 12 comprising an optically variable ink (OVI) on a first side 11 of the substrate. The coating provides a viewing-angle dependent color-shifting effect, i.e. the color of the coating as perceived by an observer depends on the viewing angle between the coating and the observer. For instance at a viewing angle of 30 degrees to the plane in which the coating lies the coating may appear greenish to the observer, whereas at a viewing angle of 60 degrees to the plane in which the coating lies it may appear blueish instead. As the substrate 10 is opaque, the viewing angle dependent color-shifting effect of the coating 12 cannot readily be observed through the substrate 10.
The coating 12 is completely covered by a substantially transparent and contiguous body 20 of a plastic material which protects the coating while allowing it to be seen though the transparent body. In the embodiment shown the transparent body 20 is formed as a single polycarbonate layer, though it may comprise (an)other or other plastic materials) as well, such as polyvinyl chloride, polyamide, polyimide and/or may comprise multiple layers of one or more transparent plastic materials. In the area where the coating 12 is arranged, the body 20 is provided with abutting lens portions 21, 22, 23 which are formed as integral parts of the body. Each of these lens portions comprises a linear array of parallel semi-cylindrical lenses, and each of these arrays is arranged at an angle to the other arrays. For instance, in the top view of Fig. 1 A, lens portions 21,22,23 enclose a triangle, with angle a1 between the lenses of lens portions 21,22 being about 55 degrees, angle B1 between the lenses of lens portions 22,23 being about 90 degrees, and with angle y1 between the lenses of lens portions 23,21 being about 35 degrees.
Compared to the total thickness H of the document at the lens portions 21,22,23, the coating 12 is very thin, i.e. the coating is at least 10 times thinner than the total thickness H. Similarly, the transparent body 20 is thinner than the substrate 10. For instance, the coating may have a thickness in the range of 15 to 50 micrometers, whereas the substrate may have a thickness in the range of 450 to 950 micrometers, and the transparent body may have a thickness in the range of 100 to 400 micrometers but in any case smaller than that of the substrate. In the embodiment shown, the substrate 10 has a thickness hi of about 600 micrometer, the coating 12 has a thickness h2 of about 30 micrometer, and the transparent body, at the position of the lenses, has a thickness of about 240 micrometer, which is substantially equal to the focal length of each of the semi-cylindrical lenses. The total thickness H of the document at the position of the lenses thus is about 840 micrometer. The ID-card 1 is planar and substantially rigid so that it is resistant to bending in a manner that would form sharp fold lines in the card. Thus, during regular the substrate and the security element thereon remain substantially planar, rather than being folded along a sharp folding line.
Though the lens portions 21,22,23 abut they do not overlap, as can be seen more clearly in the cross-sectional views of Figs. 1B and 1C. Figs. 1B and 1C further shown that the lens arrays of the respective lens portions 21,22,23 each have a corresponding focal plane P1, P2, P3 which coincides with a side of coating 12 which faces the lens arrays. The focal planes P1,P2,P3 thus extend in a common plane C.
Figs. 2A and 2B respectively show a top view of a second embodiment of a security document according to the invention, and a cross-sectional view thereof along line ll-B. In Figs. 1A1C and 2A and 2B, like structures are indicate by like reference numerals. The security document again is an ID-1 card 1, comprising substrate 10 on which a coating is 12 is provided on a first side 11 of the substrate. A body 30 of a substantially transparent plastic covers the coating 12 and any portion of the first side 11 not covered by the coating. The transparent body is provided with three lens portions 31,32,33 through each of which a corresponding portion of the coating can be viewed by an observer. The lens portions, which are formed integrally in the transparent body, are spaced apart from each other. Each lens portion 31,32,33 lies, when seen in projection onto the substrate, completely within the area of the contiguous coating 12. The parallel semi-cylindrical lenses of lens portion 31 extend at an angle a2 of about 40 degrees to the parallel cylindrical lenses of lens portion 32, and extend at an angle B2 of about 50 degrees to the cylindrical lenses of lens portion 33. The lens arrays of lens portions 32 and 33 are at an angle γ2 of about 90 degrees to each other, though in another embodiment these lens arrays could for instance be at an angle of about 80 degrees to each other. Fig. 2B shows that the transparent body extends across the entire first side 11 of the substrate.
Fig. 3A shows a further embodiment according to the invention in which again like reference numerals refer to like structures as in Figs 1A-1C and 2A,2B. In this embodiment, a transparent plastic body 40 is provided, which comprises lens portions 41,42, 43, 44, 45 which each have an array of parallel semi-cylindrical lenses extending at an angle to the other arrays of parallel semicylindrical lenses. The lens portions 41 - 45 together enclose a pentagon, a portion of which is free from lenticular lenses. Within the area surrounded by the lens portions 41-45 there is further provided a lens portion 46 comprising an array of circular concentric lenses. The lenses of lens portion 46 also have substantially semi-cylindrical cross-sections, as can be seen in the crosssectional view through line ll-B shown in Fig. 3B, but extend circumferentially rather than linearly. Thus, from substantially any angle of view in which an observer can view a portion of the coating through lens portion 46, he is likely to see a color-shifting effect.
Figs. 4A and 4B illustrate how several properties and dimensions of a lenticular lens, such as a semi-cylindrical lenticular lens, are generally defined in the art. Fig. 4B shows a cross-section of a lenticular lens array 50 on top of a planar substrate 51. The lenticular lens array comprises a plurality of parallel of semi-cylindrical lenses, each having a same width w and a thickness g. The thickness g, sometimes also denoted gauge thickness, is the sum of the base thickness b and the crescent depth c. With reference to Fig. 4A, each semi-cylindrical lens has a lens radius r which extends over an arc angle a. In the example shown, each lens has a focal length f that is substantially equal to the gauge depth, though this is not necessarily always the case. The focal length of the lens can be calculated as f = nr/ (n-1), wherein r is the index of refraction of the lens. The definition of the dimensions and properties of the lenticular lens shown in Figs. 4A and 4B corresponds substantially to that of US 6,424,467.
Figs. 5A, 5B and 5C schematically show cross-sectional views of further variations of the present invention. Though not visible, in each of the embodiments of Figs. 5A-5C semi-cylindrical lenses of a first lens portion 61,71,81 extend at an angle of about 45 degrees to semi-cylindrical lenses of a second lens portion 62,72,82 in the respective corresponding transparent bodies 60,70,80. Fig. 5A shows than that the lenses of the first lens portion 61 have a greater gauge thickness g1 and width than the lenses of the second lens portion 62. Consequently, the focal length of the lenses of the first lens portion 61 is larger than the focal length of the lenses of the second lens portion. However, the first focal plane P1 of the first lens portion 61 and the second focal plane
P2 of the second lens portion lie in a common plane C which substantially coincides with the top surface of the coating 12.
In Fig. 5B the coating 12, 12’ is a contiguous coating, which however has a greater thickness at portion 12 below the first lens portion 71 of transparent body 70 than at portion 12’ below second lens portion 72 of the body. The gauge thicknesses of the lenses of the first lens portion and of the second lens portion are substantially equal, but the width of the lenses of the first lens portion is greater than the width of the lenses of the second lens portion. The first focal plane P1 of the first lens portion 71 does not lie in a common plane with the second focal plane P2 of the second lens portion. A security document having a configuration as shown in Fig. 5B may for instance be produced by exerting a pressure on the portion of the substrate 10 where coating portion 12 is to be applied, subsequently applying the coating portions 12 and 12’, and continuing to apply coating at portion 12 until it is thicker than at portion 12’. In this embodiment, both the focal lengths and the focal planes of the first and second lens portions 71,72 differ.
Fig. 5C shows an embodiment in which lens portions 81 and 82 of transparent body 80 have substantially equal widths and gauge thicknesses, and have corresponding focal planes P1, P2 which lie in a common plane C. For both lens portions 81,82, the lenses have substantially the same focal length. As in the embodiments described earlier herein, the lens portions 81,82 may be provided in the transparent body 80 by pressing a die which comprises complementary shapes of the first and second lens portions into the transparent body after the transparent body has been applied over the coating 12.
In summary, the invention relates to a substantially rigid security document comprising a substrate and a security element provided on the substrate, comprising: a coating on the substrate and adapted for providing a viewing angle dependent color-shifting effect; a substantially transparent body of a plastic material arranged such that the coating is located between the substrate and the transparent body and can be viewed through the transparent body, the transparent body comprising a first lens portion with a first array of parallel semi-cylindrical lenses through which a first portion of the coating can be viewed, and a second lens portion with a second array of parallel semi-cylindrical lenses through which a second portion of the coating can be viewed, wherein the second array is angularly offset with respect to the first array.
The present invention has been described above with reference to a number of exemplary embodiments as shown in the drawings. Modifications and alternative implementations of some parts or elements are possible, and are included in the scope of protection as defined in the appended claims.

Claims (22)

ConclusiesConclusions 1. Veiligheidsdocument (1) omvattend een substraat (10) en een beveiligingselement dat op het substraat is verschaft, waarbij het beveiligingselement omvat:A security document (1) comprising a substrate (10) and a security element provided on the substrate, the security element comprising: een coating (12) gerangschikt op het substraat en ingericht om een kijkhoekafhankelijk kleurverschuivend effect te verschaffen;a coating (12) arranged on the substrate and arranged to provide a viewing angle-dependent color shifting effect; een in hoofdzaak transparant lichaam (20; 30; 40; 60; 70; 80) van een kunststof materiaal zodanig gerangschikt dat de coating (12) tussen het substraat (10) en het transparante lichaam (20; 30; 40; 60; 70; 80) is geplaatst en door het transparante lichaam heen kan worden bekeken, waarbij het veiligheidsdocument, langs een lijn die normaal ten opzichte van het substraat is en zich uitstrekt door de coating, het in hoofdzaak transparante lichaam en het substraat, een dikte heeft van ten minste 500 micrometer;a substantially transparent body (20; 30; 40; 60; 70; 80) of a plastic material arranged such that the coating (12) between the substrate (10) and the transparent body (20; 30; 40; 60; 70) 80) is positioned and can be viewed through the transparent body, the security document, along a line normal to the substrate and extending through the coating, the substantially transparent body and the substrate, having a thickness of at least 500 micrometers; waarbij het transparante lichaam (20; 30; 40) omvat een eerste lensgedeelte (21; 31; 41; 61; 71; 81) met een eerste array van parallelle semi-cilindrische lenzen (21a) waardoorheen een eerste gedeelte van de coating kan worden bekeken, en een tweede lensgedeelte (22; 32; 42; 62; 72; 82) met een tweede array van parallelle semi-cilindrische lenzen (22a) waardoorheen een tweede gedeelte van de coating kan worden bekeken, waarbij de tweede array hoekverschoven is ten opzichte van de eerste array; en waarbij de semi-cilindrische lenzen van de eerste en tweede array een brandpuntsafstand hebben van ten minste 10 micrometer, bij voorkeur ten minste 100 micrometer, meer bij voorkeur ten minste 200 micrometer.wherein the transparent body (20; 30; 40) comprises a first lens portion (21; 31; 41; 61; 71; 81) having a first array of parallel semi-cylindrical lenses (21a) through which a first portion of the coating can be passed and a second lens portion (22; 32; 42; 62; 72; 82) having a second array of parallel semi-cylindrical lenses (22a) through which a second portion of the coating can be viewed, the second array being angular shifted relative to the first array; and wherein the semi-cylindrical lenses of the first and second array have a focal length of at least 10 micrometers, preferably at least 100 micrometers, more preferably at least 200 micrometers. 2. Veiligheidsdocument volgens conclusie 1, waarbij de semi-cilindrische lenzen van de eerste array een eerste brandpuntsvlak (P1) hebben en de semi-cilindrische lenzen van de tweede array een tweede brandpuntsvlak (P2) hebben, waarbij de eerste en tweede brandpuntsvlakken (P1,P2) zich binnen een gezamenlijk vlak (C) uitstrekken en het oppervlak van de coating (12) die naar het transparante lichaam (20; 30; 40) is gekeerd zich in hoofdzaak binnen het gezamenlijk vlak (C) bevindt.The security document of claim 1, wherein the semi-cylindrical lenses of the first array have a first focal plane (P1) and the semi-cylindrical lenses of the second array have a second focal plane (P2), wherein the first and second focal faces (P1) , P2) extend within a common surface (C) and the surface of the coating (12) facing the transparent body (20; 30; 40) is substantially within the common surface (C). 3. Veiligheidsdocument volgens conclusie 1 of 2, waarbij de brandpuntsafstand van de eerste array van semi-cilindrische lenzen (21a;31a;41a) met ten minste 50 micrometer verschilt van de brandpuntsafstand van de tweede array van semi-cilindrische lenzen (22a; 32a; 42a).The security document of claim 1 or 2, wherein the focal length of the first array of semi-cylindrical lenses (21a; 31a; 41a) differs by at least 50 microns from the focal length of the second array of semi-cylindrical lenses (22a; 32a 42a). 4. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij de eerste array (21; 31 ;41) van semi-cilindrische lenzen en de tweede array van semi-cilindrische lenzen ten minste gedeeltelijk tegen elkaar aan liggen.The security document according to any of the preceding claims, wherein the first array (21; 31; 41) of semi-cylindrical lenses and the second array of semi-cylindrical lenses abut at least partially against each other. 5. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij het transparante lichaam verder een of meer verdere lensgedeelten (23; 43,44,45) omvat, waarbij elk van de verdere lensgedeelten een array van parallelle semi-cilindrische lenzen omvat dat hoekverschoven is ten opzichte van de eerste en tweede array van semi-cilindrische lenzen.The security document according to any of the preceding claims, wherein the transparent body further comprises one or more further lens portions (23; 43,44.45), wherein each of the further lens portions comprises an array of parallel semi-cylindrical lenses that is angled relative to the first and second array of semi-cylindrical lenses. 6. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij het in hoofdzaak transparante lichaam (20; 30; 40) verder een of meer lensvrije gedeelten omvat aangrenzend aan het eerste en/of tweede lensgedeelte, waarbij de een of meer lensvrije gedeelten in hoofdzaak transparant en vrij van lenticulaire lenzen zijn.The security document according to any of the preceding claims, wherein the substantially transparent body (20; 30; 40) further comprises one or more lens-free portions adjacent to the first and / or second lens portion, the one or more lens-free portions being substantially transparent and are free of lenticular lenses. 7. Veiligheidsdocument volgens conclusie 6, waarbij ten minste een van de een of meer lensvrije gedeelten een aaneengesloten gedeelte is dat de eerste en tweede gedeeltes omringt.The security document of claim 6, wherein at least one of the one or more lens-free portions is a contiguous portion that surrounds the first and second portions. 8. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij het in hoofdzaak transparante lichaam verder een gedeelte omvat met een array van concentrische semicilindrische lenticulaire lenzen.The security document of any one of the preceding claims, wherein the substantially transparent body further comprises a portion with an array of concentric semicilindrical lenticular lenses. 9. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij de eerste en tweede array hoekverschoven ten opzichte van elkaar zijn met een hoek (cd) in het bereik van 10 - 80 graden, bij voorkeur in het bereik van 30 - 60 graden.The security document according to any of the preceding claims, wherein the first and second array are angularly offset with respect to each other with an angle (cd) in the range of 10 - 80 degrees, preferably in the range of 30 - 60 degrees. 10. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij de coating een of meer omvat van: een optisch variabele inkt, vloeibare kristallen, dichroïsche inkt, iriserende inkt en/of interferentie pigmenten.The security document according to any of the preceding claims, wherein the coating comprises one or more of: an optically variable ink, liquid crystals, dichroic ink, iridescent ink and / or interference pigments. 11. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij het veiligheidsdocument in hoofdzaak stijf is.A security document according to any of the preceding claims, wherein the security document is substantially rigid. 12. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij de semicilindrische lenzen van de eerste en/of tweede array een steekafstand hebben in het bereik van tussen 30 en 300 micrometer.The security document according to any of the preceding claims, wherein the semi-cylindrical lenses of the first and / or second array have a pitch in the range of between 30 and 300 micrometers. 13. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij de semicilindrische lenzen van de eerste en/of tweede array een dikte hebben in het bereik van tussen 100 en 300 micrometer.The security document according to any of the preceding claims, wherein the semi-cylindrical lenses of the first and / or second array have a thickness in the range of between 100 and 300 micrometers. 14. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij het substraat en het in hoofdzaak transparante lichaam van eenzelfde materiaal zijn gemaakt, elk bij voorkeur omvattend of bestaand uit een of meer lagen van polycarbonaat, PVC, ABS, polyester, polyamide, polyimide, acrylische materialen, en/of een andere kunststof uit de groep thermoplastics of thermohardende polymeren.A security document according to any one of the preceding claims, wherein the substrate and the substantially transparent body are made of the same material, each preferably comprising or consisting of one or more layers of polycarbonate, PVC, ABS, polyester, polyamide, polyimide, acrylic materials, and / or another plastic from the group of thermoplastics or thermosetting polymers. 15. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij de coating een opaciteit voor zichtbaar licht heeft van ten minste 30%.The security document according to any of the preceding claims, wherein the coating has a visible light opacity of at least 30%. 16. Veiligheidsdocument volgens een van de voorgaande conclusies, waarbij het substraat, ten minste in een gebied van projectie van de coating op het substraat, in hoofdzaak opaak is, bij voorkeur een opaciteit voor zichtbaar licht heeft van ten minste 90%.The security document according to any of the preceding claims, wherein the substrate, at least in a region of projection of the coating onto the substrate, is substantially opaque, preferably has a visible light opacity of at least 90%. 17. Veiligheidsdocument volgens conclusie 1, waarbij de semi-cilindrische lenzen van de eerste array een eerste brandpuntsvlak (P1’) hebben en de semi-cilindrische lenzen van de tweede array een tweede brandpuntsvlak (P2) hebben, waarbij het eerste gedeelte (12) van de coating zich in het eerste brandpuntsvlak plane (P1) bevindt, en waarbij het tweede gedeelte (17) van de coating gedeelte zich bevindt in het tweede brandpuntsvlak (P2) anders dan het eerste brandpuntsvlak (P1).The security document of claim 1, wherein the semi-cylindrical lenses of the first array have a first focal plane (P1 ') and the semi-cylindrical lenses of the second array have a second focal plane (P2), the first portion (12) of the coating is in the first focal plane plane (P1), and wherein the second portion (17) of the coating portion is in the second focal plane (P2) other than the first focal plane (P1). 18. Veiligheidsdocument volgens conclusie 17, waarbij het eerste brandpuntsvlak (P1) en het tweende brandpuntsvlak (P2) parallel aan elkaar zijn.The security document of claim 17, wherein the first focal plane (P1) and the second focal plane (P2) are parallel to each other. 19. Beveiligingselement voor een in hoofdzaak stijf veiligheidsdocument, waarbij het beveiligingselement omvat:19. Security element for a substantially rigid security document, the security element comprising: een coating (12) om te worden gerangschikt op een substraat van het veiligheidsdocument en ingericht om een kijkhoekafhankelijk kleurverschuivend effect te verschaffen;a coating (12) to be arranged on a substrate of the security document and arranged to provide a viewing angle-dependent color-shifting effect; een in hoofdzaak transparant lichaam (20; 30; 40) van een kunststof materiaal dat ten minste ten dele op de coating is gerangschikt zodanig dat de coating (12) door het transparante lichaam heen kan worden bekeken;a substantially transparent body (20; 30; 40) of a plastic material that is arranged at least partially on the coating such that the coating (12) can be viewed through the transparent body; waarbij het transparante lichaam (20; 30; 40) een eerste lensgedeelte (21; 31; 41) met een eerste array van parallelle semi-cilindrische lenzen (21a; 31a; 41a) waardoorheen een eerste gedeelte van de coating kan worden bekeken, en een tweede lensgedeelte (22; 32; 42) met een tweede array van parallelle semi-cilindrische lenzen (22a; 32a; 42a) waardoorheen een tweede gedeelte van de coating kan worden bekeken omvat, waarbij de tweede array hoekverschoven is ten opzichte van het eerste array; en waarbij de semi-cilindrische lenzen van de eerste en tweede array een brandpuntsafstand hebben van ten minste 80 micrometer, bij voorkeur ten minste 200 micrometer.the transparent body (20; 30; 40) having a first lens portion (21; 31; 41) with a first array of parallel semi-cylindrical lenses (21a; 31a; 41a) through which a first portion of the coating can be viewed, and comprises a second lens portion (22; 32; 42) with a second array of parallel semi-cylindrical lenses (22a; 32a; 42a) through which a second portion of the coating can be viewed, the second array being angled with respect to the first array; and wherein the semi-cylindrical lenses of the first and second array have a focal length of at least 80 micrometers, preferably at least 200 micrometers. 20. Werkwijze voor het aanbrengen van een beveiligingselement op een substraat van een veiligheidsdocument, omvattend de stappen van:A method for applying a security element to a substrate of a security document, comprising the steps of: - het aanbrengen van een coating op een gedeelte van het substraat, waarbij de coating is ingericht voor het verschaffen van een kijkhoekafhankelijk kleurverschuivend effect;- applying a coating to a portion of the substrate, wherein the coating is adapted to provide a viewing angle-dependent color-shifting effect; - het aanbrengen van een in hoofdzaak transparant kunststof lichaam op de coating en op ten minste een deel van het substraat, zodanig dat de coating (12) zich tussen het substraat (10) en het transparante lichaam (20; 30; 40’) bevindt en door het transparante lichaam heen kan worden bekeken, waarbij het veiligheidsdocument, langs een lijn normaal ten opzichte van het substraat en die zich uitstrekt door coating, het in hoofdzaak transparante lichaam en het substraat, een dikte heeft van ten minste 500 micrometer;- applying a substantially transparent plastic body to the coating and to at least a part of the substrate, such that the coating (12) is located between the substrate (10) and the transparent body (20; 30; 40 ') and can be viewed through the transparent body, wherein the security document, along a line normal to the substrate and extending through coating, the substantially transparent body and the substrate, has a thickness of at least 500 micrometers; - het verschaffen van een eerste lensgedeelte en een tweede lensgedeelte in het transparante lichaam (20; 30; 40), waarbij het eerste lensgedeelte (21; 31; 41) een eerste array van parallelle semi-cilindrische lenzen (21a; 31a; 41a) heeft waardoorheen een eerste gedeelte van de coating kan worden bekeken, en het tweede lensgedeelte (22; 32; 42) een tweede array van parallelle semi-cilindrische lenzen (22a; 32a; 42a) heeft waardoorheen een tweede gedeelte van de coating kan worden bekeken, waarbij de tweede array hoekverschoven is ten opzichte van de eerste array, waarbij de semi-cilindrische lenzen van de eerste en tweede array een brandpuntsafstand hebben van ten minste 80 micrometer, bij voorkeur ten minste 200 micrometer.- providing a first lens portion and a second lens portion in the transparent body (20; 30; 40), the first lens portion (21; 31; 41) having a first array of parallel semi-cylindrical lenses (21a; 31a; 41a) has through which a first portion of the coating can be viewed, and the second lens portion (22; 32; 42) has a second array of parallel semi-cylindrical lenses (22a; 32a; 42a) through which a second portion of the coating can be viewed wherein the second array is angled with respect to the first array, the semi-cylindrical lenses of the first and second array having a focal length of at least 80 microns, preferably at least 200 microns. 21. Werkwijze volgens conclusie 20, waarbij de stap van het aanbrengen van het transparante 5 lichaam wordt uitgevoerd voorafgaand aan de stap van het verschaffen van de eerste en tweede lensgedeelten in het transparante lichaam.21. A method according to claim 20, wherein the step of applying the transparent body is performed prior to the step of providing the first and second lens portions in the transparent body. 22. Werkwijze volgens conclusie 20 of 21, waarbij de stap van het verschaffen van de eerste en tweede lensgedeelten in het transparante lichaam omvat het vormen van de eerste en tweede lensgedeelten in het transparante lichaam door een stempel, dat complementaire vormen van deThe method of claim 20 or 21, wherein the step of providing the first and second lens portions in the transparent body comprises forming the first and second lens portions in the transparent body by a stamp forming complementary shapes of the 10 eerste en tweede lensgedeeltes omvat, in het transparante lichaam te drukken.10 comprises first and second lens portions to be pressed into the transparent body. ►le^ π <N <N►le ^ π <N <N CQCQ X— llX11 Fig. 1BFIG. 1B Fig. 2A oFIG. 2A o 2>2> LLLL Fig. 3AFIG. 3A Fig. 4AFIG. 4A Fig. 4B Prior art '/ /// /// /// /// /// /// /// /// /// /// /// y// /// ///,FIG. 4B Prior art '/ /// /// /// /// /// /// /// /// /// /// /// y // /// ///,
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WO2015011494A1 (en) * 2013-07-26 2015-01-29 De La Rue International Limited Security device and method of manufacture

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US6424467B1 (en) 2000-09-05 2002-07-23 National Graphics, Inc. High definition lenticular lens
BE1017460A6 (en) 2007-02-09 2008-10-07 Leo Vermeulen Consulting Lvc LENTICULAR FOIL.

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GB2454752A (en) * 2007-11-19 2009-05-20 Rue De Int Ltd Security devices
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WO2015011494A1 (en) * 2013-07-26 2015-01-29 De La Rue International Limited Security device and method of manufacture

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