IE56359B1 - Document of value - Google Patents

Abstract

The present Invention relates to a document of value comprising a safety design formed by two networks of raised line segments being parallel to two predetermined different directions, respectively, and having two different heights forming high and low raised relievos extending on one portion or the whole of said document of value, 20 comprising a background and at least two transitory images which are formed respectively by the line segments having high raised relievos parallel to the one and the other of the predetermined different directions respectively, an image becoming visible when the design is illuminated by light rays forming an acute angle with the plane of the 25 design and parallel to a plane at least substantially perpendicular to the direction in which the Image forming segments are parallel or when the design is observed from an acute angle and in a direction parallel to a plane at least substantially perpendicular to the direction to

Description

The present Invention relates to a document of value comprising a safety design formed by two networks of raised line segments being parallel to two predetermined different directions, respectively, and having two different heights forming high and low raised relievos extending on one portion or the whole of said document of value, comprising a background and at least two transitory images which are formed respectively by the line segments having high raised relievos parallel to the one and the other of the predetermined different directions respectively, an image becoming visible when the design is illuminated by light rays forming an acute angle with the plane of the design and parallel to a plane at least substantially perpendicular to the direction in which the Image forming segments are parallel or when the design is observed from an acute angle and in a direction parallel to a plane at least substantially perpendicular to the direction to For the purpose of preventing the Issuing of fslss documents of value and Mrs particularly of banfcnotes. various printing mthods have been proposed and In particular documents of value have Peen provided with safety design consisting of fins lints nf different colors forming a complex image se that It Is difficult to reproduce them by using photographic Mans, however. the development of reproduction techniques have Mde It possible for forgers to overcoM, at least In certain cases· this difficulty. Another solution consisted in fabricating documents of value of which at least one fraction of the surface comprises rnissd lines obtained by using the so-called intaglio method. On the basis of this Mthod sovorsl modified versions have been proposed. More particularly, the obtaining of s transitory image mde ef parallel raised linos was proposed. Accordieg to a modified version, the transitory ismge is detectable only through s suitable transparent screen or by llluminstlne the document of value with s suitable light. In another caao the color of the aides of the raised lines varies alone their length or from one side to another eo that when the bnnhnoto is observed from two dif forest angles tee different images appear according oa one or tha other aide of the raised lines la concealed, finally· in another case tha raised linos have a uniform color contrasting with that of the paper (the gaps between the lineal· so. that the imago fornad by those raised linos appears only -3when the doalpa Aa observed wader a relatively flat, ecete eagle ead Aa a direction parallel te a plaae eormel te sold llaee, wbAcb Aa tbla eaaa conceal the gaga between Ϊ tbam aad display a enifenay colored Aapge. Vbia Aamge Aa difficult te detect whan the design Aa observed An a direction normal te Ate plaae for the Aatage As deeempeaed . by the color contrast between the lines ead tea epace* . between llaee.

These eolations contributed to wake difflcalt if not impossible the. manufacture ef forced documents ef value for no photographic device la capable ef making a threedimensional reproduction, however, the firat-aaKitleaed variants are objectionable in that they entail the wae ef an additional device (screen, lane, special-light leap, etc I for checking the authenticity and therefore amke it . elmaat impossible in. the.dally use ef documents ef value.

Aa te the last two variants, they require a wary high degree ef precision when asking transitory Images in order to obtain a perfect color registration. On the ether hand the observation angle la relatively email, of the order ef «5* to 80* with respect te the plaae ef the paper, ae that checking a great number ef documents ceaatitutea a tedieea teak. -4In the patent FRA-A-2 192 496 a safety design corresponding to the preamble of the claim 1 of the present patent has been proposed. t According to an embodiment described but not Illustrated by a figure of ' this patent, the transitory Images consist of several letters and are formed by portions of lines having an enlarged thickness. Some letters 4 are formed by sections of lines being parallel to one of two . directions, while other letters are formed by sections of lines being parallel to the other direction. In this way, In order to be able to distinguish the two groups of letters, the document must be rotated through an angle equal to the angle formed by the two directions.

However these two Images are not superposed or interspersed, but only juxtaposed; moreover the.background of the safety design is formed on the one hand by raised lines and on the other hand by the paper itself.

It is the object of the present invention to avoid the inconveniences of the prior art and to propose an alternative to the safety design of the patent FR-A-2 192 496 rendering more difficult the counterfeiting by permitting the obtaining on the one hand of a safety design on a document of yalue by utilizing the intaglio method, without resorting to any color contrast, and on the other hand the safety design can easily be detected by an unskilled person without resorting to auxiliary means such as lamp, screen, lenses, etc·, and from a relatively wide acute angle.

The safety design according to the Invention is characterized by the fact that the whole of the surface of said safety design consists of juxtaposed groups of parallel line segments extending alternately in the two predetermined different directions so that the segments of one group are not parallel to those of an adjacent group, that the periphery of each group defines a plane geometrical pattern which Is the same for all the groups of segments parallel to the same direction and is completed by the peripheries of the adjacent groups for forming the surface of the design, the first transitory Image being formed by the high raised relievos of segments parallel to the first direction and pertaining to several groups whereas the second transitory image Is formed by the high raised relievos of the segments parallel.to the . second direction and pertaining likewise to several groups, that at . least one portion of the segments forming said two images pertains to ' adjacent groups, and that the segments or segment portions having the low raised relievo form with the gaps left between the segments the θ background of the safety design.

The advantages of the object of the Invention are as follows: The whole safety design and not only the transitory images are formed by two networks of groups of raised segments parallel respectively and alternatively to two predetermined directions.

Certain portions of the images appearing under different angles are interspersed, that means to a certain extent superposed. For each image even the superposed portions are formed by high relievos of segments belonging to one of the networks. The peripheries of groups of each network define plane geometrical figures that are the same for a given network and are completed by the geometrical figures defined by the peripheries of groups of the other network. The groups of segments are easily obtained by means of an intaglio printing and without resorting to accurate adjustments for adhering to the color register, the assembly comprising the safety design, the raised segments and the gaps between segments having preferably the same color. The authenticity can be checked by any user either by illuminating the design with natural light or by using an ordinary electric lamp, or more simply by observing it from an acute angle in a direction parallel to a plane normal to the raised lines constituting one of the images.

The second image appears when the document of value is rotated through an angle substantially equal to the angle formed between the two . predetermined directions to which the segments of two adjacent groups are parallel, respectively. ι 6I Mel to a plane at least substantially normal ta tea raised segments censtltdting the Image Is duo ta tbe feet that the segments, of which the height Is greater tbae that of the segment a eeastltutlng the background ef the design. or rather the groups of segments, appear as'having a darher color due te the shadow ef the eegsmnta projected en one another, end else te the fact Chet apparently the density of the sagamnts ssssm te Increase when they are seen In e direction st right angles, and from an acute angle with respect te their support* It la obvious that fer obtaining these results It la only eecesssry that tbe Illumination or observation angle by simply less than te*. bhaa observing tbe piper at right angles to Its plane no Image whatsoever Is seen. Inasmuch as tbe groups comprising the sagmsats forming the two Images ere. et gg Meet fer one portion et them· adjacent· eae gee eey that the Image· ·*· partially mined up.

Aeeerdlag te e preferred form gf embedlmset the two directions to whleh tbe raised segments ore parallel are perpendicular end the geometrical patters determined by -7the periphery ef one preup of segments is a rectangle, notably e square.

The invention will now ho duscribod wore in detail with reference te the attached drawing.

Figure 1 le a perspective view ef e eefety imprlet causing a first imago te appear· Figure 2 ia a view similar te that ef figure 1. which causes a second image to appear· Figure 2 la a sectional view ef an enlarged portion ef a document of value showing the various raised elements.

Figure 4 is a strongly magnified perspective view ef one portion ef e safety imprint· Fipure 8 illustrates a haaknote with the eefety imprint.

Figure S is a strongly magnified plane view ef one portion ef e safety imprlet.

The safety imprint S shown in Figures t and 2 nf a document of value P consists ef raised straight segamnts forming juxtapeaod groups I.S. Figure 8 shows some of these groups en a large scale· The segawats of two adjacent groups 1,2 are parallel to two perpendicular directions. Tha raised segments have a black appearance Put actually the raised segments and tha gap between any β . pair ef adjacent segments have the same color. A.ahade any mist between the raised segments end the pops between adjacent raised segments, if the color ef the paper support contrasts with the color ef the Amh need for printing the safety design, due te the difference in ink layer thickness between a raised eegment aad the pap left between two adjacent segments, as will be explained presently. -8i In general end contingent on the above remark tne safety design, «men seen In e direction normal to its plane, appears · bovine uniforn color. Tbe getterns bounded by tbe segment ends and the endmost segments of each group 1.8 form e seuare. however. eny other gettere My be obtained, provided that tha peripheries of two adjacent eroups conjugate so that the entire bachoreund of the design ba covered continuously.

Uhen tha design la illuminated or observed nt an ΊΦ ecute angle In a direction parallel te the arrow 0. which ie at least substantially noraal to ona of the directions to which the segment a are parallel, a first iMge is caused to appear In the form of an “A*. thia lame· being formed by raised segments and segments fractions of a height greater than that ef the other segments, respectively segment fractions, and perpendicular to direction 0. If the docwaent of value P le rotated through an angle of 00* in its plane the second image, in thia case a 8* (the email character· A and 8 on the periphery of the design being only reference Mrke added for affording a clearer understanding ef the Figures). Thia second imge la formed in the seam Mnner ee the preceding eng. but by augments perpendicular te the segments ef the precedine image.

Of course, if the two predetermined directions to which the segments are parallel are eet perpendicular, the document of value p must be rotated through on angle equal te the angle formed by those two direct lone.

Ploore 0 ebows lo Beetles the various elements of 30 the safety design. Thu document of value P la covered with en ink layer having three different levels. Tbe lowest level ef la tbe level euiatlng between tbe raised segments. Then there la level n^ which la tbe level of tbe lew raised segments. Tbe background ef tbe eafety design -9la formed by levels o, and Level is the level ef tha high raised segments or segment fractions constituting one or the other of the transitory iarngos.

By «my of example segments 4 and B pertaining to two adjacent groups are low raised segments nr segment fractions and pertain therefore to the background of the safety design. Segments 4 ere normal te the plane ef Figure 9 and segment 5 is parallel to this plane. Segment T parallel to segments 4 is · segment of which the upper portion extending throughout its length or one faction thereof at the hlohest level n^ and partakes in tha composition of one of the transitory images. The upper portion of segamnt B. which is aligned with segment S. is ......et two levels. A first portion is at level and therefore at the high level, and partakes in the composition of the other transitory image end two other portions are st level dg · therefore at the lew raised level, sod are part of the design background.

The detail shewn in enlarged perspective in Figure 20 4 also explains the formation of the safety design. All the groups with segswnts parallel to the front edge F of the document of value P are part pf the design background, and the segments perpendicular to said edge F. which partsin to the other groups, constitute a transitory image. Segment S comprises an upper portion which is at lovel η» and another portion which is at lovel a^« The segments pertaining to the same group as segment B have likewise their upper portions ot level hg. fragment · and those of its groups have alee two dlfforoot levels extending on unequal lengths, the same applying to augment . The other segments illustrated, parallel to sogsmat 10,are at level o^. All the segments or eogmoot portions of level assist lo forming on image wbleh can be seen •dies illuminating the design or when the latter is soon in -1010 • direction pnrnlMl to ©'.

Ton safety dealon My occupy either ene erection cf n document ef value, na shown in Pleura 8. er the entire surface ef the paper.

The Applicant has printed a safety deainn en n banknote accerdlnc te the intaglio Mthed by ualnn the fellewlna Monitudes for the three levels with respect te the surface ef the document ef value: n, e 0.03 mm na a.CT am n3 β. 14 am.

Claims (3)

1. A document of value comprising a safety design formed by two 7 5 networks of raised line segments being parallel to two predetermined different directions, respectively, and having two different heights * forming high and low raised relievos extending on one portion or the whole of said document of value, comprising a background and at least two transitory images which are formed respectively by the line 10 segments having high raised relievos parallel to the one and the other of the predetermined different directions respectively, an Image becoming visible when the design is Illuminated by light rays forming an acute angle with the plane of the design and parallel to a plane at least substantially perpendicular to the direction 1n which the image 15 forming segments are parallel or when the design is observed from an acute angle and In a direction parallel to a plane at least substantially perpendicular to the direction to which the image forming segments are parallel, wherein the whole of the surface of said safety design consists of juxtaposed groups of parallel line segments 20 extending alternately in the two predetermined different directions so that the segments of one group are not parallel to those of an adjacent group and the periphery of each group defines a plane geometrical pattern which is the same for all the groups of segments parallel to the same direction and Is completed by the peripheries of the adjacent . 25 groups for forming the surface of the design, the first transitory image being formed by the high raised relievos of segments parallel to the first direction and pertaining to several groups whereas the second transitory image Is formed by the high raised relievos of the segments parallel to the second direction and pertaining, likewise to several 30 groups, and at least one portion of the segments forming said two images pertains to adjacent groups, and the segments or segment portions having the low raised relievo form with the gaps left between the segments the background of the safety design. 35 2. Document of value according to claim 1, wherein the plane geometrical patterns defined by the peripheries of the groups of segments are rectangles, notably squares. ς -123. Document of value according to claim 1 or 2, wherein the two predetermined directions are perpendicular to each other. *

2. 4. Document of value according to any of claims I to 3,wherein all 5 the safety design, raised segments and gaps between segments, has the same color. t

3. 5. A document of value substantially as hereinbefore described with reference to the accompanying drawings.