FI76959C - VAERDEPAPPER, SPECIELLT SEDEL, MED SAEKERHETSMOENSTER. - Google Patents

Description

1 76959

A security, in particular a banknote with a security pattern

The invention relates to a security, in particular a banknote, having a security pattern extending over at least one part of the security and having a background and at least two images visible only under certain conditions.

Various printing methods have already been used to prevent the production of counterfeit securities, especially counterfeit notes, and in particular banknotes with a security background consisting of thin lines of different colors and complex patterns which make photographic reproduction very difficult. However, the constant development of de-icing technology has helped counterfeiters, at least in certain cases, to overcome these difficulties.

Another known attempt to solve this problem involves the production of securities in which the surface of the securities has embossing lines obtained at least in part by a steel drawing method. Based on this method, several variants have been proposed. One of these proposals concerns, in particular, a so-called making a moving image, wherein the image consists of parallel embossed lines. According to one embodiment, this moving image only appears when a suitable transparent image surface is used or when the security is illuminated with a suitable light.

In the second case, the color of the sides of the embossments varies along the length of the lines or from side to side, so that when a security is viewed from two different angles, two different images always appear depending on whether one or the other side of the embossments is hidden. In another known case, the embossed lines have a uniform color contrasting with the color of the paper or the lines between the lines, so that the image formed by these embossed lines appears only if viewed from a relatively small sharp angle and 2 76959 parallel to a plane perpendicular to these lines. remain invisible and a uniform color image appears. However, this image is difficult to identify if the security is viewed perpendicular to its plane, because then the color contrast formed between the lines and the space between these lines scatters the image.

The methods described above have made it more difficult to counterfeit securities because three-dimensional reproduction is not possible with any photographic device. However, the disadvantage of the former embodiments is that they require an accessory for authentication control, namely an image surface, a lens, a special lamp or the like, and therefore such control is practically impossible in the normal use of securities. Both of the latter embodiments, which use embossed lines, require high precision to produce moving patterns in order to achieve perfect color alignment. In addition, the exact irrigation angle is quite small and in the order of 15-20 relative to the paper level, which makes it difficult to control a large amount of securities.

French patent publication FR-2 192 496 proposes a security pattern corresponding to the preamble of the present claim 1. An embodiment is described in the publication, but not shown in the figure, in which the instantaneous images consist of several letters and consist of those parts of the lines which have a greater thickness. Some letters are made up of lines running in one direction, while others are made up of lines running in the other direction. In order to be able to distinguish between the two groups of letters, the document must be rotated so that the rotation angle corresponds to the angle between the directions. However, the images are not layered or interleaved, but only arranged side by side, and in addition, the background of the security pattern consists of 3 76959 lines of low embossments on the one hand and the paper itself on the other.

The object of the present invention is to avoid the disadvantages of the prior art and to provide an alternative to the security pattern disclosed in French patent FR-2 192 496 which makes imitation more difficult and which can develop a security pattern on a security using a steel drawing method without using any color contrast. pattern simply without aids such as lamps, shades, lenses, etc., and especially at a relatively large sharp angle.

The task is solved according to the invention by the features given in claim 1.

The advantages of the object of the invention are as follows: the security pattern is formed of parallel embossed line blocks arranged in groups next to each other and which can be produced simply by a steel drawing method without the need for precise adjustments to achieve perfect color alignment. The entire safety pattern, which consists of embossed parts of the line and the space between them, is essentially the same color. Authenticity can be performed by each user by illuminating a plane arranged at an acute angle and parallel to the embossed portions of a single image with natural light or ordinary electric light, or simply by looking at the security. Turning the security by approximately one angle, which is equal to the angle between the two directions in which the line periods run in groups, brings up another picture.

This effect is achieved in such a way that, within a group, the line segments whose height is greater than the height of the line segments forming the background of the pattern appear to be slightly darker, because on the one hand the shadow 4 76959 falls on another line segment and the line segment density appears increased and at an acute angle to their background. To consider these effects, it is sufficient that the angle of illumination and the angle of view are only less than 90.

When a security is viewed perpendicular to its plane, virtually no image is observable, and even less so if at least some of the groups of both images connecting the line segments are adjacent and therefore the two images are partially mixed.

Appropriate forms will be apparent from the other requirements.

The invention is further illustrated by the drawings of an exemplary embodiment.

Fig. 1 is a perspective view of the security pattern showing the first image, Fig. 2 is a similar view of the same security pattern of Fig. 1 showing the second image, Fig. 3 is a section of one part of the security on an enlarged scale, section shows different elevation elements, Fig. 4 is one section of the security pattern a strongly enlarged perspective view of a part, Fig. 5 shows a banknote with a security pattern, and Fig. 6 is a highly enlarged top view of one part of the security pattern.

The security pattern S of the security P shown in Figures 1 and 2 consists of straight-line lines protruding from the surface of the security and arranged in adjacent groups 1, 2. Figure 6 shows some of these groups 1, 2 on an enlarged scale. The line periods run in each group 1, 2 in each case in parallel, however, the line periods of the other group are arranged perpendicular to the respective groups 5 76959. In the figures, the embossed line periods are shown in black, however, in reality, the color of these embossed line periods is the same as the color of the space between the two line periods. However, there may be tonal differences in the colors of the embossed line periods and the space between them if the print carrier, i.e. the paper, has a color in contrast to the ink used to print the security pattern, these different tonal differences being due to differences in color layer thicknesses in the embossed pattern in the space between the two line periods.

When the safety pattern is viewed perpendicular to its plane, it usually appears as a uniform color, taking into account the possible effect mentioned above. The patterns bounded by the ends of the line periods and the line periods outside each group 1, 2 form squares in each case in the example considered. However, other patterns may also be implemented provided that the edges of each region of the contiguous group of line periods substantially coincide at the boundaries of the regions so that the entire security pattern can be formed seamlessly from such groups of line periods.

If the safety pattern is illuminated or viewed at an acute angle and in a direction D (Figures 1 and 2) set at least almost perpendicular to the direction parallel to the line segments, the observer first sees the first image and flips the second image o P 90. in the example considered, it is first the letter A and then the letter Z. One of these figures consists of parallel line segments and parts of line segments with an embossing whose height is greater than the height of the other line segments and line segments forming those images. In Figures 1 and 2, the letters A and Z given at the edge of the safety pattern are only fixed points for a better understanding of the figures. Thus, when viewed from the direction D in Fig. 1, the letter A appears in the figure, which consists of correspondingly selected line sections or parts thereof running perpendicular to the direction D; viewed from direction D as shown in Figure 2 when the security is reversed

O

90, the image appears in the form of the letter Z, which consists of selected line periods and portions of line periods that run perpendicular to the line periods that make up the first image.

If the two directions in which the line periods of the first and second images travel are not perpendicular to each other, the security P must be inverted to display the first or second image at an angle corresponding to the angle between the two said directions.

Figure 3 shows a section of the different elements of the security pattern. The security P is coated with a color layer 3 with three different levels. The lowest level nl is the level between the raised line periods. The plane n2 is the plane with those embossed line periods or parts of line periods that are not needed to form said images. These embossments can be characterized as low embossments. Both planes n1 and n2 form the background of the safety pattern. The top plane n3 is the plane that forms the line periods and parts of the line periods of said images; the embossments of these episodes can be characterized as high embossments.

According to Fig. 3, the line periods 4 and 5 belong to two adjacent groups and are formed with a low embossing pattern so that together with only the safety areas at the height n1 of the embossing pattern they represent the background of the safety pattern. The line periods 4 run vertically with respect to the character plane of Fig. 3, while the line period 5 runs parallel to this plane. The line section 7, which is located parallel to the line sections 4, has a high embossing along its entire length or part of its length with the plane n3 and forms a component of one of the patterns mentioned here. The line section 6, 7 76959 running in the same direction as the line section 5 is staggered in the example under consideration and has on the one hand a plane corresponding to the high embossing of plane n3 used to form one of said images and on the other side two areas of this high embossing on both sides. low embossing; these belong to level n2 and form part of the background of the safety pattern.

Figure 4 also illustrates the layout of the security pattern on an enlarged scale. The groups having line periods running parallel to the leading edge F of the security P all belong to the background of the security pattern, while the line periods running perpendicular to the edge F belonging to the other groups form one of said images. The line period 8 has a high embossing area, corresponding to the level n3, and a low embossing area, corresponding to the level n2. The line sections belonging to the same group as the line section 8 likewise have a high embossing corresponding to the plane n3. Line section 9 and other line sections in this group all have two different levels, with different lengths of high and low embossing. The line section 10 also consists of a low and a high embossing pattern. The other line sections running parallel to the line segment 10, shown in Fig. 4, have a high embossing pattern. All bar sections or parts of the line periods with a high relief pattern, that is, the level n3 under consideration form the image components if the security pattern is illuminated or examined parallel to the direction of the arrow D 'direction.

The security pattern may cover either only a part of the security, as shown in Figure 5 for a security P with a security pattern S, or also the entire surface of the security.

The characteristic dimensions of the elements of the security pattern produced on the banknote according to the steel letterpress printing method are as follows: with respect to the paper surface of the banknote, the three said planes have heights n1 = 0.03 mm, n2 = 0.07 mm and n3 = 0.14 mm.

Claims (5)

1. A security (P> with a security pattern CS> consisting of two periods of embossed lines parallel to two preselected directions with two different, low and high embossed heights <n2> n3> and extending in part or in full to said security < P> over, wherein the security has a background and at least two snapshots (A, Z>, each consisting of line periods with a high embossing pattern Cn3> parallel to the first or second preselected direction, whereby the image appears when the pattern CS > illuminated by light rays at an acute angle to the plane of the pattern and parallel to a plane at least almost perpendicular to the direction in which the line periods forming the image are parallel, characterized in that the entire surface of the safety pattern <S> consists of adjacent groups of parallel line periods <1, 2), which vary variably kah in a predetermined different direction such that the line periods of one group (1) are not parallel to the line periods of the other group (2), that the circumferential edge of each group C1, 2> defines a uniform geometric pattern that is the same for all groups of parallel line periods in the same direction, and complemented at the circumferential edges of adjacent groups to form the surface of the pattern CS> that the first instantaneous pattern CA or Z> consists of a high embossing <n3> of line periods running parallel to the first direction and also belongs to several groups <2 or 1) that at least part of both images CA, The line periods forming Z) belong to adjacent groups C1, 2>, and that the line periods or parts of the line periods with a low embossing pattern Cn2 >> together with the spaces between the line periods form the background of said safety pattern <S). Security according to Claim 1, characterized in that the flat geometric patterns defined by the circumferential edges of the groups <1, 2) formed by 9 76959 line periods are rectangles, in particular squares. Security according to Claim 1 or 2, characterized in that the two preselected directions are perpendicular to one another. Security according to one of Claims 1 to 3, characterized in that the entire surface of the security pattern <S>, which consists of embossed line periods and the gaps formed between these line periods, is of the same color. 1. Värdepapper CP), vilket har ett säkerhetsmönster (S), som är bildat av tvä nät av relief Iinjesegment, som är Paral-lella med tvä olika förutbestämda riktningar och har tvä oli-ka höjder <n2, n3> för bildande av höga och läga reliefer, som sträcker sig over en del av eller over hela värdepappret CP), vilket har en bakgrund oct ätminstone tvä momentanbilder CA, Z), som bildae av de höga relief1 injesegment Cng) som är parallella med den ena respektive den andra av de rörningbe stämda riktningarna, varvid en bild blir synlig dä mönstret CS) belyses med ljussträlar, som bildar en specig kinkel med monstret soon and in parallel with that soon, in which case ätmins-tone approximation of the idea in which the picture is derived from the image in parallel, or in the form of a CS) betraktas under en spetsig kinkel och parallellt med ett soon, som ätminstone approximativt kinkelrätt mot den riktning med vilken de bilden bildande segarä h parallel, k & nne-tecknat av att säkerhetsmön strets CS) hela yta utgöres av vid aidan av varandra belägna grupper Cl, 2) av parallella linjesegmet, som omväxlande sträcker sig i de tvä olika för-utbestämda riktningarna pä ädant sätt, att segenen en en grupp Cl) inte är parallella med segen i en närbelägen grupp C 2), att varje grupps Cl, 2) omkrets definierar en soon geometric figure, vilken är densamma för alla grupper av seg-