PatentDe  


Dokumentenidentifikation EP1716004 06.09.2007
EP-Veröffentlichungsnummer 0001716004
Titel SICHERHEITSVORRICHTUNG
Anmelder De La Rue International Ltd., Basingstoke, Hampshire, GB
Erfinder DAVIS, Sharon Christine, Alton, Hampshire GU34 1JL, GB;
BARTHRAM, Anita Marie, Newbury, Berkshire RG14 5RG, GB
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 602005001763
Vertragsstaaten AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HU, IE, IS, IT, LI, LT, LU, MC, NL, PL, PT, RO, SE, SI, SK, TR
Sprache des Dokument EN
EP-Anmeldetag 18.02.2005
EP-Aktenzeichen 057177446
WO-Anmeldetag 18.02.2005
PCT-Aktenzeichen PCT/GB2005/000580
WO-Veröffentlichungsnummer 2005080089
WO-Veröffentlichungsdatum 01.09.2005
EP-Offenlegungsdatum 02.11.2006
EP date of grant 25.07.2007
Veröffentlichungstag im Patentblatt 06.09.2007
IPC-Hauptklasse B42D 15/00(2006.01)A, F, I, 20061004, B, H, EP

Beschreibung[en]

The invention relates to a security device and a method for making such a security device. The invention is particularly concerned with security devices for documents of value such as banknotes, certificates and the like.

It is well known to provide security devices in the form of holograms and diffraction gratings using surface relief structures. However, an alternative class of security device is based on non-diffractive line structures, that is structures which produce an optically variable effect when the angle of incidence of light varies but in which this effect is not caused by interference or diffraction.

An example of such a structure is described in WO 94/29119 . In this case, a variety of line structures are embossed into a transparent, plastics substrate, the embossed lines defining regions in which the lines extend at different angles to each other and define different shapes that are visible to a greater or lesser extent upon transmission and reflection of light as the substrate such as a banknote is tilted, rotated or viewed from different angles.

WO 90/02658 describes a security device in which one or more transitory images are embossed into a reflective surface.

WO 98/20382 discloses a further security device in which groups of elemental areas in which lines extend at different angles from each other form respective image pixels.

Finally, US-A-1996539 discloses a decorative device in which a relief structure is formed in a surface and has an optically variable effect.

There is a need to improve upon the known devices to increase their security.

In accordance with a first aspect of the present invention, a security device comprises a substrate having a reflective surface portion which is provided with a raised line structure, the line structure defining a plurality of segments, each segment being formed by a respective set of substantially parallel raised lines, the lines of at least three segments extending in different directions, each line carrying an ink which does not extend fully into the spaces between the lines or which is sufficiently translucent between the lines so as not to obscure the reflective surface between the lines, wherein each segment causes incident light to be reflected non-diffractively in a variable manner as the angle of incidence changes.

In accordance with a second aspect of the present invention, a method of manufacturing a security device comprises providing a reflective surface portion of a substrate with a raised line structure, the line structure defining a plurality of segments, each segment being formed by a respective set of substantially parallel raised lines, the lines of at least five segments extending in different directions, and providing each line with an ink which does not extend fully into the spaces between the lines or which is sufficiently translucent between the lines so as not to obscure the reflective surface between the lines, wherein each segment causes incident light to be reflected non-diffractively in a variable manner as the angle of incidence changes.

Thus, as the device is tilted relative to the incident light and angle of view it will exhibit optically variable effects.

The invention provides a security device which presents a moving effect viewable across a wide range of angles (in contrast to the limited angles over which a conventional latent image is viewable). It is simple to authenticate yet difficult to counterfeit. It is also surprisingly visible from a distance due to the reflective background.

The use of 3 or more segments enables a movement effect to be achieved. Ideally, many segments should be used with lines extending in different directions to ensure that reflected light is visible at substantially all viewing angles. To that end segments containing lines extending at say 10 , 20 , 30 etc to some nominal direction are preferred.

The lines are preferably embossed or debossed into the substrate. The embossing process is preferably carried out using an intaglio plate having recesses defining the line structure which are filled with the ink so that the lines and ink are simultaneously provided in register.

However, in an alternative approach, the lines of ink could be printed onto the unembossed reflective surface which is subsequently embossed in register. The former approach is preferred since registration is more simply achieved.

The invention also extends to non-embossed raised lines produced for example by screen or thermographic printing. Here an ink film is applied in such a thickness that it has a relief, in the case of UV printed screen inks this could be comparable to depth of relief achievable by intaglio.

The lines within each segment can take any convenient form including straight (rectilinear) or curved such as full or partial arcs of a circle or sections of a sinusoidal wave.

The lines may be continuous or discontinuous and, for example, formed of dashes, dots or other shapes. By other shapes we mean the dots or dashes could have a graphical form. For example microtext printed at a size of 12 microns will appear as continuous lines when viewed with the naked eye. Under closer inspection using an eye glass the apparent continuous line can be visualised as text. The microtext could be alphanumeric characters, logos (e.g. trademarks), geometric shapes and the like.

The sides of the lines typically extend at an angle offset from a normal to the surface.

The lines within a segment typically have substantially the same width and/or height and/or pitch but one or more of these could vary.

A particularly preferred example involves providing a region in the security device which has greater relief when printed. This is typically achieved by using an intaglio printing plate which is deeper in this region than the remainder of the plate.

The line widths are typically in the range 10-300 microns, preferably 50-150 microns. The space between the lines is typically 10-300 microns. The line width to space ratio is typically 3:1 to 1:2 but preferably 2:1; i.e. for a line width of 70 microns, the space would be between 23 and 140 microns, preferably 35 microns.

The line segments may or may not be individually discernable to the unaided naked eye. Preferably, the individual lines are barely visible to the naked eye, the main visual impression being given by the segments and the combined effect thereof.

Each segment can take any shape or form, for example square, triangle, hexagon, star, flower or indicia such as a letter or number. The segments may tessellate or nest.

In some cases, the segments may be outlined with a continuous printed or non-printed perimeter line or the outline may simply be defined by the extent of the raised lines, preferably carrying ink. The continuous printed or non-printed line may define information such as indicia.

The segments will typically abut although in some cases they may be spaced apart. The space between adjacent segments is typically in the range of 20 microns to 2mm. Alternatively, the segments could overlap and in a particularly preferred approach the segments are nested one within another. This latter arrangement is particularly preferred where each segment defines a similar shape. In the most preferred example, the nested segments are rotated relative to one another.

In another example, the segments within the security device define a range of different shapes and, for example, might comprise a combination of triangles and rhombi.

Additionally, the unprinted areas within one or more segments could define additional information such as alphanumerics. The alphanumerics could relate to information elsewhere on the document.

Where the segments are spaced apart, the plain areas between them may be of a similar shape to that of the segments.

The segments may also be arranged into largershapes including, for example, geometric shapes, flowers, numbers or letters.

The specularly reflective portion of the substrate may be formed by a foil, metallic ink, metallic coating, iridescent coating, glossy varnish, hologram, high refractive index or optical effect film. By optical effect film we mean for example multilayer iridescent film. The reflective surface portion can be solid or discontinuous and, for example, may contain spaces with or without a coloured print underneath. It may be of any shape or size.

Typically, the specularly reflecting portion can be any colour, for example metallic blue, metallic red, silver or gold, and where specularly reflecting inks are used, these will generally give a general appearance, which is not as highly reflecting as a foil or other specular mirror surface but a distinctive sheen.

The raised line structure may extend beyond the reflective portion and/or the reflective portion may extend beyond the raised line structure.

The substrate is typically paper although other known substrates such as plastics could also be used. It is known that an improved reflective effect (whether this be via printing or foil transfer) can be achieved on a smooth substrate. With this in mind plastic substrates are likely to show a strong reflective effect but are less likely to emboss as well as paper. As an alternative a paper substrate could be primed to improve its surface finish. By priming we mean the paper could be coated, varnished or calendared prior to application of a reflective ink/foil layer. As a further alternative the foil/reflective ink could be calendered after application to the paper surface. This has a polishing effect again improving the reflectivity of the metallic surface. This polishing will occur to some extent anyway as part of the intaglio process. Where the flat smooth, uninked areas of the intaglio plate come into contact with the reflective foil/ink they polish the foil/inks surface.

In an important aspect, where the lines are formed using an intaglio plate, further intaglio printing or blind embossing may be carried out using the same intaglio plate so as to achieve precise registration between the different components. Indeed, in some cases, some of the recesses defining the security device may be filled with ink and others left unfilled.

The colour of the ink or pigment used on the raised lines may match the colour of the specularly reflective surface. Preferably, however, the colour of the ink or pigment contrasts with that of the specularly reflective surface. The advantage of this is that as the viewing angle and/or illumination angle changes, different segments become more strongly visible. This leads to the appearance of having two or more different colours simultaneously and is a very cost effective way of achieving an optically variable effect.

It is possible to achieve additional effects by combining accurately, one or more colours in the form of an ink with the raised lines in such a way that the reflective portions of the lines which are not covered by the coloured ink provide an optically variable effect in conjunction with the absorptive/reflective effect of the coloured ink. Thus, the colour of the ink can be used to change the overall appearance of the (specularly) reflective background. For example, a green ink could be printed over a silver background to create the effect of having a green specularly reflective surface.

In preferred examples using embossed or debossed line structures, the ink is provided on the lines and does not extend into the spaces between the lines. However, it is possible for the ink to extend between the lines if it is sufficiently thin so as to be translucent.

The security device may be embodied as a label such as a transfer label which can then be adhered to a document of value. Alternatively, the substrate of the security device could also constitute the substrate of a document of value.

Some examples of security devices according to the invention will now be described with reference to the accompanying drawings, in which: -

  • Figure 1 is a schematic representation of a banknote bearing a security device according to the invention;
  • Figure 2 illustrates schematically and in enlarged form part of the security device shown in Figure 1;
  • Figure 3 illustrates schematically and in enlarged form part of a further security device;
  • Figures 4A-'4C illustrate the appearance of the security device of Figure 3 when illuminated from three different directions;
  • Figure 5F is a schematic cross-section through part of a segment of the device shown in Figure 2;
  • Figures 5A-5E illustrate different stages in the production of such a segment;
  • Figures 6A-6C illustrate further examples of a device according to the invention;
  • Figure 7A-7H illustrate examples of segments of lines;
  • Figures 8 and 9A-9C illustrate nested arrangements of segments of lines;
  • Figure 10 shows a further device; and,
  • Figures 11A-11C illustrate three further devices.

Figure 1 illustrates a banknote formed on a paper substrate 1 and carrying printing of a conventional type and in addition carrying an example of a security device 2 according to the invention. In this case, the security device 2 has been intaglio printed directly onto a reflective portion of the banknote substrate and another part of the same intaglio printing plate has been used to print, at the same time, images (the portrait and indicia "De La Rue", "2000") indicated schematically at 3, so that these images are automatically and accurately registered with the device 2.

Figure 1 shows the feature in the context of a banknote design with the feature numbered 2 and other printed intaglio regions numbered 3. Further to these printed intaglio regions other regions could be provided as uninked embossed areas, such as described in WO90/02658 . Figure 2 illustrates the device 2 in enlarged form. It will be noted that the number 2000 is not printed and it is also not embossed. This is a non-printing area on the intaglio plate within the area of the design. In addition, the device includes a first border made up of several indicia "2000" and an outer decorative border. All these regions are in register and printed from the same intaglio plate.

As explained above, the security device 2 can take a variety of forms and Figure 3 illustrates one example. In this example, the security device is made up of a variety of triangular 4 and square 5 shaped segments which are tessellated together. In this case, although a perimeter line is shown around each shape, this is, in fact, simply defined by the ends of the parallel lines making up the segments. The segments are each defined by a set of substantially parallel lines with the lines of different segments being angularly offset from one another.

Part of this security device is shown in enlarged form under different lighting conditions in Figures 4A to 4C. Thus, in Figure 4A, the light is incident in a direction 9 and this will be reflected by the segments 5a and 4a-4d. This is because the lines in these segments extend at or near 90° to the incident light direction.

When the device is rotated so that the incident light direction is in a direction 10 (Figure 4B), a different set of segments appears bright. In this case, the segments include segments 5b and 4e. Some of the segments appear less bright while the remaining segments appear dark. Again, this brightness depends upon how close the lines defining the segment extend at 90° to the incident light direction 10.

Figure 4c illustrates a further angle of incidence 11 in which segments 4f-4m appear bright with the remaining segments appearing dark.

The top portion of each embossed line is covered with an ink as shown in Figure 5F. Thus in this Figure, each embossed line of a substrate 1 is indicated at 6 with the ink at 7. As can be seen, the sides of each line are at an acute angle to a normal to the substrate and the valleys 8 between the summits of the lines 6 are free of ink but are reflective.

If the ink 7 is chosen to have a colour which contrasts with the reflective surface of the substrate 1 into which the lines have been embossed then the dark segments will exhibit the colour of the ink 7 in each case. Thus, as the security device shown in Figure 3 is rotated relative to the incident light direction, the triangular shaped areas will switch on and off giving rise to an appearance of movement across the device as described in Figure 4. This is a novel effect which is relatively easily detected by a user thus making it particularly suitable as a security device. Nevertheless, it is difficult to reproduce fraudulently. Thus this feature is much easier to authenticate than the latent type structure. It can also be easily located. As a secondary benefit, more with respect to OVDs, it is relatively cheap. As the feature can be produced using the existing litho and intaglio processes, the use of costly optically variable foils is avoided.

Figures 5A-5E illustrate different stages in the intaglio printing of the portion shown in Figure 5F. Initially, an intaglio plate 12 having recesses 13 is coated with ink 7, the ink filling the recesses 13 and providing a surplus on the surface of the plate 12. This surplus is then wiped away in a conventional manner (Figure 5B) and the substrate 1 placed onto the inked plate (Figure 5C). Pressure is then applied between the plate 12 and substrate 1 (Figure 5D) causing the substrate to enter the recesses 13. The substrate is then removed and draws with it most of the ink 7 contained within the respective recesses 13 but leaving a small remainder as can be seen in Figure 5E. The resultant, printed substrate has the form shown in Figure 5F.

A typical segment size is 2mm by 2mm or an equivalent area. By equivalent area we include the fact that the segment could be long and thin and could be a line bordering an area. For example in Figure 6A each "segment", such as 14, is essentially a line around a square. In the figure drawn real size one can see that the width of this line is not that great but the line is quite long. Essentially the segments should be of a size and shape such that they can be visualised with the unaided eye. That is one should be able to discern the changing visual impression of each segment as viewing angle changes.

Figures 6B-6c illustrate further examples of arrangements of segments, such as 15 and 16.

Figures 7A to 7H illustrate a variety of other shapes which the segments can take. Figures 7A-7F show segments with a printed perimeter line in register with the embossed lines while Figures 7G and 7H show segments bounded only by the extent of the parallel lines. Multiple versions of segments shown in Figures 7G and 7H could be located adjacent one another but leaving a narrow unprinted line between them.

Figure 8 illustrates an example of the security device in which a set of hexagonal shaped segments 20-23 are nested one within the other, each hexagon being rotated relative to the immediately adjacent inner and outer hexagons. Each hexagon 20-23 is defined by a set of lines with the angles of the lines being different and also their line widths and pitches. The segments could vary from 70µm thick lines with 30µm spacing progressively up to 150µm thick lines with 75µm spacing. As this security device is rotated, it will appear as a rotating hexagon which diminishes or expands in size. This is a particularly attractive but secure feature.

Figures 9A-9C illustrate further examples of nested segments. Figure 9A shows a device with nested and rotated segments, the segments provided with a printed perimeter line. Figure 9B shows a device with nested and rotated segments, the segments not provided with a perimeter line. Figure 9C shows a device with nested and rotated segments, the segments provided with an unprinted perimeter line.

In the next example, a region is provided in the feature design on the intaglio plate which is deeper compared to the remainder of the feature design. This will in turn equate to a region that has a greater relief when printed. To explain this, consider the design of security device shown in Figure 10. The design shown in Figure 10 comprises two elements: a background 31 of nested segments all rotated with respect to each other, and a central numeral 1 indicated by reference 30. In this simple example the central numeral 1 can be originated such that the intaglio plate was deeper in this area compared to the surrounding nested segments.

In a different example, using a structure such as that shown in Figure 6A, a latent effect may be created. Here the feature comprises only a series of nested segments rotated with respect to each other with no apparent secondary element. Indeed if originated as per normal practice one would still only have the one feature as already described: But it is possible to selectively produce deeper regions on the plate and thus produce an area in a defined shape (say a numeral 1) that is deeper than the surrounding area. This would not be readily recognisable under normal viewing but should be viewable when the device is viewed at an acute angle. One example of how this might be achieved using the polymer process is given below.

  1. 1. Exposure through the line structure film work onto photopolymer as usual.
  2. 2. Carry out a first wash out of say 10 seconds to give a depth of, for example, 50 microns to produce a photopolymer with the line structure having a nominally consistent depth of 50 microns.
  3. 3. Carry out a second exposure using a solid design; say a numeral 1 or a pattern. The photopolymer will be hardened everywhere except where masked by the numeral 1 or pattern.
  4. 4. Carry out a second wash out. Where the plate has been hardened further no further washing out of the photopolymer occurs however in the numeral/pattern region which was subject to the further exposure additional photopolymer is washed out resulting in a deeper engraving say 70 microns.

Other known techniques could be used to produce the intaglio plate such as mechanical or laser origination techniques. For example as disclosed in EP-A-0906193 and WO-A-03/103962 .

As explained throughout, where intaglio printing is used to produce the security device, it is possible to provide uninked embossed areas as well as printed ink areas using the same plate.

Figure 11 illustrates some further examples of banknotes (shown schematically) carrying security devices. In Figure 11A, the device comprises a line of star shapes each fabricated in the manner shown in Figure 7D but with different line orientations.

Figures 11B and 11C illustrate vertical and circular arrangements of star shapes.


Anspruch[de]
Sicherheitsvorrichtung umfassend ein Substrat mit einem reflektierenden Abschnitt, der mit einer erhabenen Linienstruktur versehen ist, wobei die Linienstruktur eine Vielzahl von Segmenten definiert und jedes Segment jeweils aus einer entsprechenden Gruppe von im Wesentlichen parallelen erhabenen Linien gebildet wird, und sich die Linien von mindestens drei Segmenten in unterschiedliche Richtungen erstrecken, und jede Linie aus einer Tinte gebildet wird oder diese trägt, welche sich nicht vollkommen in die Zwischenräume zwischen den Linien erstreckt oder zwischen den Linien ausreichend durchscheinend ist, damit sie die reflektierende Oberfläche zwischen den Linien nicht verdeckt, dadurch gekennzeichnet, dass jedes Segment bewirkt, dass einfallendes Licht nicht-diffraktiv auf variable Weise bei Änderung des Einfallswinkels reflektiert wird. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die im Wesentlichen parallelen Linien in einem Segment gerade oder gekrümmt sind. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die im Wesentlichen parallelen Linien in einem Segment nicht durchgängig sind. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich die im Wesentlichen parallelen Linien benachbarter Segmente in unterschiedliche Richtungen erstrecken. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die im Wesentlichen parallelen Linien in einem Segment im Wesentlichen dieselbe Breite und/oder Höhe und/oder Neigung aufweisen. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Segmente dieselbe Form aufweisen. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Segmente geometrische Formen oder alphanumerische Zeichen definieren. Vorrichtung mindestens nach Anspruch 6, dadurch gekennzeichnet, dass die dieselbe Form definierenden Segmente miteinander verschachtelt sind. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass die Segmente relativ zueinander gedreht sind. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass eine Gruppe der Segmente relativ zu einer anderen so definiert und angeordnet ist, dass ein Bild, wie eine geometrische Form oder alphanumerische Zeichen, definiert wird. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Segmente aneinander angrenzen. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich die Tintenfarbe (oder die Tintenfarben) von der Farbe in dem reflektierenden Abschnitt unterscheidet. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erhabene Linienstruktur in das Substrat eingeprägt oder auf das Substrat aufgeprägt ist. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass die Linien, teilweise ohne Tinte sind. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der reflektierende Abschnitt aus Folie, metallischer Tinte, metallischer Beschichtung, changierender Beschichtung, glänzendem Lack, Hologramm oder holographischer Beschichtung gebildet wird. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der reflektierende Abschnitt nicht durchgängig ist. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich die Linienbreiten im Bereich von 10-300 Mikron, vorzugsweise von 50-150 Mikron befinden. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich der Zwischenraum zwischen benachbarten Linien im Bereich von 10-300 Mikron befindet. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Verhältnis von Linienbreite zu Zwischenraum in der Regel 3:1 bis 1:2, vorzugsweise 2:1 beträgt. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich die erhabene Linienstruktur über den reflektierenden Abschnitt hinaus erstreckt. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich der reflektierende Abschnitt über die Linienstruktur hinaus erstreckt. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Vorrichtung ferner einen gedruckten Rand umfasst. Vorrichtung nach Anspruch 22, dadurch gekennzeichnet, dass der Rand ein Register mit der erhabenen Linienstruktur ist. Vorrichtung nach Anspruch 23, dadurch gekennzeichnet, dass der Rand und die erhabene Linienstruktur unter Verwendung unterschiedlicher Teile derselben Druckplatte gedruckt worden sind. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Substrat unbeschichtetes Papier, beschichtetes Papier oder Kunststoff umfasst. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Substrat Teil eines Wertdokuments bildet. Wertdokument, das eine Sicherheitsvorrichtung nach einem der Ansprüche 1-25 trägt. Wertdokument nach Anspruch 27, dadurch gekennzeichnet, dass die Sicherheitsvorrichtung an das Dokument geklebt wird. Vorrichtung oder Wertdokument nach einem der Ansprüche 26 bis 28, dadurch gekennzeichnet, dass das Wertdokument eine Banknote umfasst. Verfahren zur Herstellung einer Sicherheitsvorrichtung, wobei das Verfahren das Versehen eines reflektierenden Oberflächenabschnitts eines Substrats mit einer erhabenen Linienstruktur, wobei die Linienstruktur eine Vielzahl von Segmenten definiert und jedes Segment jeweils aus einer entsprechenden Gruppe von im Wesentlichen parallelen erhabenen Linien gebildet wird, und sich die Linien von mindestens drei Segmenten in unterschiedliche Richtungen erstrecken, und das Versehen jeder Linie mit einer Tinte, welche sich nicht vollkommen in die Zwischenräume zwischen den Linien erstreckt oder zwischen den Linien ausreichend durchscheinend ist, damit sie die reflektierende Oberfläche zwischen den Linien nicht verdeckt, umfasst, dadurch gekennzeichnet, dass jedes Segment bewirkt, dass einfallendes Licht nicht-diffraktiv auf variable Weise bei Änderung des Einfallswinkels reflektiert wird. Verfahren nach Anspruch 30, dadurch gekennzeichnet, dass die Linien eingeprägt sind, wobei der Prägeschritt unter Verwendung einer Tiefdruckplatte mit die Linienstruktur definierenden Aussparungen, die mit Tinte gefüllt sind, erfolgt. Verfahren nach Anspruch 30 oder 31, dadurch gekennzeichnet, dass die zum Definieren der Linien verwendete Druckplatte auch ein von der Sicherheitsvorrichtung getrenntes, weiteres Bild definiert. Verfahren nach einem der Ansprüche 30 bis 32 zur Herstellung einer Sicherheitsvorrichtung nach einem der Ansprüche 1-29.
Anspruch[en]
A security device comprising a substrate having a reflective portion which is provided with a raised line structure, the line structure defining a plurality of segments, each segment being formed by a respective set of substantially parallel raised lines, the lines of at least three segments extending in different directions, each line being formed by or carrying an ink which does not extend fully into the spaces between the lines or which is sufficiently translucent between the lines so as not to obscure the reflective surface between the lines, wherein each segment causes incident light to be reflected non-diffractively in a variable manner as the angle of incidence changes. A device according to claim 1, wherein the substantially parallel lines within a segment are straight or curved. A device according to claim 1 or claim 2, wherein the substantially parallel lines within a segment are discontinuous. A device according to any of the preceding claims, wherein the substantially parallel lines of adjacent segments extend in different directions. A device according to any of the preceding claims, wherein the substantially parallel lines within a segment have substantially the same width and/or height and/or pitch. A device according to any of the preceding claims, wherein the segments have the same shape. A device according to any of the preceding claims, wherein the segments define geometric shapes or alphanumeric indicia. A device according to at least claim 6, wherein the segments defining the same shape are nested one within the other. A device according to claim 8, wherein the segments are rotated relative to one another. A device according to any of claims 1 to 7, wherein a group of the segments are defined and arranged relative to one another so as to define an image such as a geometric shape or alphanumeric indicia. A device according to any of the preceding claims, wherein the segments abut one another. A device according to any of the preceding claims, wherein the ink colour (or colours) is different from the colour of the reflective portion. A device according to any of the preceding claims, wherein the raised line structure is embossed or debossed into the substrate. A device according to claim 13, wherein parts of the lines are uninked. A device according to any of the preceding claims, wherein the reflective portion is formed by one of a foil, metallic ink, metallic coating, iridescent coating, glossy varnish, hologram or holographic coating. A device according to any of the preceding claims, wherein the reflective portion is discontinuous. A device according to any of the preceding claims, wherein the line widths are in the range of 10-300 microns, preferably 50-150 microns. A device according to any of the preceding claims, wherein the space between adjacent lines is in the range 10-300 microns. A device according to any of the preceding claims, wherein the line width to space ratio is typically 3:1 to 1:2, preferably 2:1. A device according to any of the preceding claims, wherein the raised line structure extends beyond the reflective portion. A device according to any of the preceding claims, wherein the reflective portion extends beyond the raised line structure. A device according to any of the preceding claims, wherein the device further comprises a printed border. A device according to claim 22, wherein the border is in register with the raised line structure. A device according to claim 23, wherein the border and raised line structure have been printed using different parts of the same printing plate. A device according to any of the preceding claims, wherein the substrate comprises one of uncoated paper, coated paper, and a plastic. A device according to any of the preceding claims, wherein the substrate forms part of a document of value. A document of value carrying a security device according to any of claims 1-25. A document of value according to claim 27, wherein the security device is adhered to the document. A device or document of value according to any of claims 26 to 28, wherein the document of value comprises a banknote. A method of manufacturing a security device, the method comprising providing a reflective surface portion of a substrate with a raised line structure, the line structure defining a plurality of segments, each segment being formed by a respective set of substantially parallel raised lines, the lines of at least three segments extending in different directions, and providing each line with an ink which does not extend fully into the spaces between the lines or which is sufficiently translucent between the lines so as not to obscure the reflective surface between the lines, wherein each segment causes incident light to be reflected non-diffractively in a variable manner as the angle of incidence changes. A method according to claim 30, wherein the lines are embossed, the embossing step being carried out using an intaglio plate having recesses defining the line structure which are filled with the ink. A method according to claim 30 or claim 31, wherein the printing plate used to define the lines also defines a further image separate from the security device. A method according to any of claims 30 to 32, for manufacturing a security device according to any of claims 1-29.
Anspruch[fr]
Dispositif de sécurité comprenant un substrat présentant une partie réfléchissante qui est pourvue d'une structure à lignes relevées, la structure à lignes définissant une pluralité de segments, chaque segment étant formé par un ensemble respectif de lignes relevées sensiblement parallèles, les lignes d'au moins trois segments s'étendant dans des directions différentes, chaque ligne étant formée par ou supporte une encre qui ne s'étend pas entièrement dans les espaces entre les lignes ou qui est suffisamment translucide entre les lignes de façon à ne pas masquer la surface réfléchissante entre les lignes, dans lequel chaque segment entraîne la réflexion non diffractive d'une lumière incidente d'une manière variable à mesure que l'angle d'incidence change. Dispositif selon la revendication 1, dans lequel les lignes sensiblement parallèles à l'intérieur d'un segment sont droites ou courbes. Dispositif selon la revendication 1 ou la revendication 2, dans lequel les lignes sensiblement parallèles à l'intérieur d'un segment sont discontinues. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les lignes sensiblement parallèles de segments adjacents s'étendent dans des directions différentes. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les lignes sensiblement parallèles à l'intérieur d'un segment présentent sensiblement la même largeur et/ou hauteur et/ou le même pas. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les segments présentent la même forme. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les segments définissent des formes géométriques ou des caractères alphanumériques. Dispositif selon au moins la revendication 6, dans lequel les segments définissant la même forme sont imbriqués les uns dans les autres. Dispositif selon la revendication 8, dans lequel les segments sont tournés les uns par rapport aux autres. Dispositif selon l'une quelconque des revendications 1 à 7, dans lequel un groupe de segments sont définis et agencés les uns par rapport aux autres de façon à définir une image telle qu'une forme géométrique ou un caractère alphanumérique. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les segments butent les uns contre les autres. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la couleur (ou les couleurs) de l'encre est (sont) différente(s) de la couleur de la partie réfléchissante. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la structure à lignes relevées est imprimée en bosse ou en creux sur le substrat. Dispositif selon la revendication 13, dans lequel des parties des lignes ne sont pas encrées. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la partie réfléchissante est formée par un élément parmi une feuille, une encre métallique, un revêtement métallique, un revêtement irisé, un vernis brillant, un hologramme ou un revêtement holographique. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la partie réfléchissante est discontinue. Dispositif selon l'une quelconque des revendications précédentes, dans lequel les largeurs des lignes sont situées dans une plage allant de 10 à 300 microns, de préférence de 50 à 150 microns. Dispositif selon l'une quelconque des revendications précédentes, dans lequel l'espace entre les lignes adjacentes se trouve dans une plage allant de 10 à 300 microns. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le rapport de la largeur des lignes sur l'espace s'étend généralement de 3:1 à 1:2, est de préférence de 2:1. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la structure à lignes relevées s'étend au-delà de la partie réfléchissante. Dispositif selon l'une quelconque des revendications précédentes, dans lequel la partie réfléchissante s'étend au-delà de la structure à lignes relevées. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le dispositif comprend en outre une bordure imprimée. Dispositif selon la revendication 22, dans lequel la bordure coïncide avec la structure à lignes relevées. Dispositif selon la revendication 23, dans lequel la bordure et la structure à lignes relevées ont été imprimées à l'aide de différentes parties de la même plaque d'impression. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le substrat comprend un élément parmi un papier non couché, un papier couché, et un plastique. Dispositif selon l'une quelconque des revendications précédentes, dans lequel le substrat fait partie d'un document de valeur. Document de valeur comportant un dispositif de sécurité selon l'une quelconque des revendications 1 à 25. Document de valeur selon la revendication 27, dans lequel le dispositif de sécurité est collé au document. Dispositif ou document de valeur selon l'une quelconque des revendications 26 à 28, dans lequel le document de valeur comprend un billet de banque. Procédé de fabrication d'un dispositif de sécurité, le procédé comprenant les étapes consistant à munir une partie de surface réfléchissante d'un substrat d'une structure à lignes relevées, la structure à lignes définissant une pluralité de segments, chaque segment étant formé par un ensemble respectif de lignes relevées sensiblement parallèles, les lignes d'au moins trois segments s'étendant dans des directions différentes, et à munir chaque ligne d'une encre qui ne s'étend pas entièrement dans les espaces entre les lignes ou qui est suffisamment translucide entre les lignes de façon à ne pas masquer la surface réfléchissante entre les lignes, dans lequel chaque segment entraîne la réflexion non diffractive d'une lumière incidente d'une manière variable à mesure que l'angle d'incidence change. Procédé selon la revendication 30, dans lequel les lignes sont imprimées en bosse, l'étape d'embossage étant réalisée en utilisant une plaque intaglio présentant des évidements définissant la structure à lignes qui sont remplie d'encre. Procédé selon la revendication 30 ou la revendication 31, dans lequel la plaque d'impression utilisée pour définir les lignes définit également une autre image séparée du dispositif de sécurité. Procédé selon l'une quelconque des revendications 30 à 32, destiné à fabriquer un dispositif de sécurité selon l'une quelconque des revendications 1 à 29.






IPC
A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
D Textilien; Papier
E Bauwesen; Erdbohren; Bergbau
F Maschinenbau; Beleuchtung; Heizung; Waffen; Sprengen
G Physik
H Elektrotechnik

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