KR20010031973A - Security feature for a security document or document of value with a fractal laminate system - Google Patents

Abstract

The present invention relates to safety features for bills and securities comprising a transparent body (2) with a device for displaying graphical information according to the angle (18, 19, 20) between the illumination direction and the viewing direction. The device consists of thin plates 6-8 (14-17) that almost overlap, and the thin plates are arranged approximately stepped in the body (2). Preferably, the thin plates 7, 8 are formed fractalically and arranged in an ascending order in the body 2.

Description

SECURITY FEATURE FOR A SECURITY DOCUMENT OR DOCUMENT OF VALUE WITH A FRACTAL LAMINATE SYSTEM}

The prior art of placing safety features in bills and securities is the so-called multiplex-hologram. Here holograms are presented which present different images to the viewer in different viewing directions. In addition, so-called interference layers in thin films or generally transparent bodies are known. Such interference layers include thin optical layers that produce a graphical or color effect with respect to the angle of view.

In addition, so-called variable displays are known. A variable display includes a lens array that is disposed over a print or safety feature on a security and generates different images according to the viewing angle depending on the direction of vision for the lens.

A disadvantage of the aforementioned technique is that the hologram and the interference layer do not appear well under various lighting conditions. In addition, holograms and interference layers disperse the wavelength. That is, different color columns appear in the white light depending on the observation angle at the time of observation.

The aforementioned lens arrays require complex manufacturing techniques and constant, infinite substrate thickness.

The present invention relates to a safety feature for paper and securities according to the preamble of claim 1 and to a method of manufacturing the same.

1 is a schematic representation of a substrate with a simple lamination device for non-fractal subdivisions,

FIG. 2 shows the substrate of FIG.

3a shows a line segment forming the lateral edge of the sheet according to FIG. 1, FIG.

3b shows a subdivision of the line segment of the sheet according to FIG. 3a at a first angle,

Figure 3c is a subdivision of the line according to Figure 3b at double the angle,

3d shows the subdivision of the line segment according to FIG. 3c at tripling of the angle,

4 shows light and dark variations in the variation of the viewing direction.

It is an object of the present invention to provide a safety feature that generates different graphical information in different ways in a simple and inexpensive manner.

This object is achieved according to the invention by the features of claim 1.

An important feature of the present invention is that thin plates are arranged in a transparent body which almost overlap one another, and the thin plates fill the cross-section of the body in an ascending order of steps. Preferably an ascending fractal sheet is used.

The present invention is subdivided by a thin plate system in which the transparent substrate is not transparent in such a way that the substrate looks transparent in a constant viewing direction with respect to the substrate, while the transparent lamination system can be visible and is not viewed through the substrate when the viewing direction is changed. Is based on the fact that

If the substrate is rotated in the same viewing direction, the substrate looks transparent or black as it rotates, because if it looks black the non-transparent lamination system interferes with seeing through the substrate with its non-transparent lamination.

The rotation of the substrate produces a light and dark effect.

In an embodiment of the present invention, the lateral edges of each thin plate do not form a straight line, but each thin plate is subdivided into a plurality of partial thin plates in the order of stepping up, thereby forming a fractal thin plate which fills the cross section of the substrate. do.

By subdividing the thin plate system into fractal thin plates, there is an advantage that the fluctuations of the light and dark principles are made suddenly. In other words, the thin plate is decomposed at a correspondingly high repetition rate, so that a sudden fluctuation of light and dark, i.e., from one graphic element to another graphic element, may occur during rotation of the substrate. In an ideal state, if there are enough repetitive steps in breaking apart individual thin plates into fractal sub laminations, there are no intermediate steps.

By the placement of the fractal lamination, the transparent substrate can be formed completely transparent, for example during a full observation of a constant viewing angle of 90 °, and sudden fluctuations can be made, from which the substrate can no longer be seen transparent during further rotation. have.

For example, in an ideal case the substrate appears transparent at an angle of 0 ° -90 °, while the substrate appears dark at an angle of 91 ° -180 °.

In a preferred embodiment of the present invention, not only a single lamination system is provided for such a transparent substrate, which can provide bright and dark information by ensuring the bright and dark variation, but also a plurality of interacting lamination systems are provided on the substrate. Is provided.

As mentioned above, the first thin sheet system is transparent in the range of 0 ° -90 °. When the second thin sheet system is placed on the substrate, the second thin sheet system appears opaque in the range-the range in which the first thin sheet system appears transparent-so that two different graphical information at the viewing angle of 0 °-90 ° appear. That is, the graphic information (brightness) of the first thin sheet system is given, and when viewed through the substrate at the same viewing angle of 0 ° -90 °, the graphic information of the second thin sheet system appears dark in the bright state.

Such thin sheet systems may be arranged side by side and / or layered. Such thin sheet systems may be covered with each other or provided in separate areas.

The foregoing has only explained that when linear thin plates are subdivided into fractal thinly separated thin plates, light and dark graphics can be generated. Not only bright and dark information can be conveyed by the present invention, but instead of a single line subdivision, the letters composed of individual lines can be fractally subdivided. Due to this, for example, the letter A can be visible in the inner space of the substrate through the transparent substrate at the first time, and when the substrate is rotated at different viewing angles, the letter A suddenly disappears and the letter B appears.

This is only achieved by the overlap and integration of two different thin sheet systems on the transparent substrate.

The thin sheet system according to the invention is suitable for use in transmitted light and / or incident light.

Subjects of the invention are individual claims and combinations thereof.

All features disclosed herein are the subject of the present invention if they are novel compared to the prior art individually or in combination.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 shows a substrate comprising a total of three (spaced apart) thin plates 6, 7, 8, ie a transparent body 2. The body has two mutually spaced longitudinal sides 3, to which a narrow side 26 is arranged at a 90 ° angle. The body is also defined by an upper cover surface 4 and a lower cover surface 5. In other words, the plate-like body 2 which is to be transparent is dealt with here.

In the inner space of the body, thin plates 6, 7, 8 are arranged parallel to each other, and interspaces 12, 13 are formed therebetween.

Each sheet is defined by a longitudinal edge 9 that is approximately parallel to the longitudinal edge of the narrow side 26. In addition, the surface of each thin plate 6-8 is parallel to the narrow side 26 of the plate-like body. The narrow side of each thin plate is defined by a line segment 1 approximately parallel to the narrow side of the body.

Looking through the transparent body in the direction of arrow 10, it can be seen through the interspace 12 between the thin plates 6, 7, 8, because the thin plate itself is visible in this direction. This is because the body is transparent.

Alternatively, looking at the body 2 in the direction of the arrow 11 (or in the opposite direction), the opaque laminations 6, 7, 8 interfere with seeing through the body. That is, the body looks black.

Depending on the direction of vision, bright and dark information depending on the location and number of thin plates can be conveyed.

Subdividing the line segment 1 according to FIG. 3a into a plurality of line segments 1b according to FIG. 3b converts the line segment 1.

The present invention is based on the fact that surprising projection properties can be realized by fractal thin-film systems. The fractal lamination system is formed by repeated use of the transformation for the line segment 1 of FIG. 3A. For example, FIG. 3D shows a thin sheet system formed by repeatedly dividing line segment 1 into N-parts and rotating by an angle Θ. 3b to 3d show different iteration steps of the configuration. Despite the finer subdivision of the sheet, the depth D required for the sheet system does not increase significantly. The thin sheet system of FIG. 3d is nearly opaque for angles of 0 ° to + 90 ° and almost transparent for angles of 0 ° to −90 ° (see FIG. 4). For small angles (Θ) and large angles (N), the deviation of opacity and opacity approaches zero as the repetition rate increases. From this fractal sheet, an image can be constructed that appears and disappears at a sharply defined angle. Mathematically, it is demonstrated that a fractal lamination system with parallel projection can be constructed that provides a desired image for the solid angle from all solid angles.

The thin sheet system can be exposed, recorded, embossed, extruded, mechanically formed (drilled) or implemented in a similar manner into a substrate. Lamination systems can be designed to take into account perspective or plan views (back lighting or reflection). By suitably selecting the color of the substrate and the thin plate, safety features can be implemented in color.

Advantages of the invention over prior art:

-Amazing, clearly provable effects.

″ Reading ″ of the structure of sheet metal systems is very difficult.

-Difficult to track lamination system.

In an embodiment of the present invention, multiple layers of the thin sheet system are arranged in planes of different depths of the substrate, and the graphic effect according to the angle can be seen in the transmitted light.

In another embodiment, the graphical effect according to the angle may be visible in the incident light.

FIG. 2 shows the application of the fractal foils 14, 15, 16, and 17 shown in FIG. 3D in the substrate according to FIG. 1.

There, the thin plates 14-17 are arranged in series with one another in close steps and steps in the formation of the interspaces 12, 13. If the body 2 is observed from the top in the region between the directions of the arrows 21-22, the interspaces 12, 13 allow perspective through the fractal sheet. Alternatively, the body 2 appears dark in the region between the directions of arrows 11-22.

In Fig. 3b, each theta is denoted by reference numeral 18, the angle 19 according to Fig. 3c being twice the angle 18, while the angle 20 according to Fig. 3d is three times the angle 18. .

In FIG. 4, the bright areas 24 in the angular range of + 90 ° to 0 ° are given, and the dark areas 25 in the angular range of 0 ° to + 90 ° are given according to the viewing direction 23. Schematically shown.

The idea of the present invention is to give very good safety properties that can prevent counterfeiting, which can be very easily incorporated into bills and securities. Such transparent bodies can be placed in the windowed sections of bills and securities and can be observed in transmitted or incident light.

Claims (8)

In safety features for bills and securities comprising a transparent body with a device for displaying graphical information according to the angle between the illumination direction and the viewing direction, The device is characterized in that the device consists of thin plates (6-8; 14-17) which almost overlap, the thin plates being arranged approximately stepped in the body (2). The method of claim 1, Safety feature, characterized in that the thin plates (14-17) are fractally arranged and arranged in an ascending order in the body (2). The method according to claim 1 or 2, Safety features, characterized in that a plurality of layers of the thin plates (14-17) are arranged in the body (2) side by side or side by side. The method of claim 3, wherein Safety features, characterized in that the layers of the thin plates (14-17) fill different areas in the body (2). The method according to claim 3 or 4, Safety feature, characterized in that the layers of the thin plates (14-16) form a constant angle with each other. The method of claim 1, wherein Safety feature characterized in that the safety feature is suitable for transmitted light and / or incident light. A method of manufacturing a safety feature according to any one of the preceding claims, Preparing a transparent body 2, Repeating the thin plate structure from the starting line Forming said thin plate structure in the body (2) by light, embossing, coating or mechanical treatment. The method of claim 7, wherein Laser light is used.