Paper, in particular security paper

(42) Date of commencement of the patent: 15. 1. 1996 (45) Date of issue: 26. 8.1996 (51) Int.Cl.⁶ : B42D 15/00

<td>(56) Documents:</td><td>(73) Patent owner:</td>

<td>US 4896901A GB 185214A2 EP 400902A2 EP 279880A1</td><td>NATIONAL BANK OF AUSTRIA A-1090 VIENNA (AT). (72) Inventor: FÄRBER WOLFGANG DIPL.ING. 0R. VIENNA (AT).</td>

The invention relates to a security, eg banknote, check or the like, having at least one window (2) bridged by a film (3), which passes through the paper, the film (3) within the The transparent foil (3) fills the window (2) or is at the top and / or bottom of the paper (1), spanning the window (2), attached.

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AT 401 365

KR 6078018

AT 401 365 Β

The invention relates to a security, such as a banknote, a check or the like., With at least one window bridged by a film which penetrates the paper, wherein the film within the window contour is transparent (as a transparent film) is formed, for example, a plastic film.

Security documents can have as a security element a thread or a tape that is embedded in the document (DE-OS 39 06 695). The security element may consist of a translucent plastic film which has an opaque coating extending over the element with recesses in the form of characters and patterns to be introduced. In addition, the security element contains colorant and / or luminescent substances in regions which coincide with the recesses, by means of which the characters and / or patterns differ from the security document and from the opaque coating in color-contrasting form under suitable light conditions. This ensures that the characters, patterns or the like. are visible in transmitted light and can be read visually and / or by machine.

Also known has been a security in which the security element is also embedded in the security, but the paper fibers render the security strip invisible from each side of the security paper (EP-A1 279 880).

EP-A2 400 902 discloses a banknote having at least one window bridged by a film. The film is hiebei designed as a security element and can be present in various designs. Common to these embodiments is that the security element comprises a plurality of layers, wherein a carrier layer and metallic portions are provided such that in reflected light, the unaided eye in each window at least two metallic surfaces appear, which along the length of the security element repeatedly image structures form, wherein the metallic surfaces have different colors. The window does not penetrate the banknote and exposes only one side of the film, which limits the control options.

In a security of the type mentioned above, the film bridging the window is designed as a light-polarizing element. The arrangement of the film is made such that it is on both sides of layers, eg made of paper or plastic, is covered, these layers can be described or printed. The film is, due to the aligned windows in the two outer layers, in the window already visible from the outside. Between the outer surfaces of the two layers and the film is in each case a step formed by the edge of the window. This can be on the slide within the window contour dirt u.dgl. deposit.

Problems also arise in the securities sector as a result of the proliferation of color copying machines of ever-improving quality and equipment, which provide copies which, especially when viewed at a glance, are virtually indistinguishable from the original. Increased efforts are therefore being made to develop methods that make it impossible to copy securities, or at least to provide copies that differ strikingly from the original. It has already been proposed (DE-OS 33 14 670) to apply to at least a part of the surface of a confidential document, a material which is capable of emitting illumination light with a wavelength which is different from the wavelength of Illuminationslicht when illuminated with Illuminationslicht. By exposing such a prepared document to the illumination light of a copier and capturing the emission light with a detector, it can generate signals that can be used to interrupt or cancel at least one of the steps required to duplicate the original document in the copier , The preparation of the document can hiebei be difficult, and the applied material can change or peel off, so the security function is no longer feasible.

The invention shows a way to avoid this disadvantage and also to prevent that on the film within the window contour dirt u.dgl. deposits. It is proposed in a security of the type mentioned that the transparent film fills the window or attached to the top and / or bottom of the paper spanning the window. By the proposal according to the invention it is achieved that the transparent film fills the window, so on both sides flush with the outer surface of the paper. However, it is also possible to arrange the transparent film on the top and / or bottom of the paper so that the film spans the window. The window is thus closed at least from one side against the ingress of dirt. In attempts to copy such a designed paper, created at the point where the window is located, a blob that is correspondingly colored in color copiers or becomes dark in a black and white copier, so that the paper can be easily recognized as a copy immediately. The (outline) form of the window can be arbitrary, eg round, oval, polygonal etc. However, the window shape may also be a symbol for a paper property, eg the value of the paper, its.

AT 401 365 Β

The security may also be constructed as a two-ply sandwich of a normal paper layer with a recessed window and a second layer consisting of the film.

The film bridging the window or the paper bridging the window can be provided in the window region with a preferably machine-readable imprint or with an applied additional security feature.

The transparent film can also be made of transparent paper.

The invention is explained below with reference to the drawing. It show, Fig. 1 a plan view of a first embodiment of a paper according to the invention, Fig. 2 a section along the line ll-ll in Fig. 1, Fig. 3 one of the FIG. 2 corresponding section, but by a comparison with the embodiment of Figures 1 and 2 modified embodiment, and Fig. 4 a structure of a normal paper layer in conjunction with a second transparent or transparent film or paper layer.

In the drawing, 1 denotes a paper sheet (security), which is provided in the illustrated embodiment with a window 2 oval shape, which passes through the paper. The window 2 is covered by a transparent film 3. Preferably, this film is made of plastic.

In the embodiment according to FIG. 3, the transparent film 3 fills the paper 1 (security), so that there is no step in the area of ​​the outline of the window 2, but the paper remains flat over its entire surface.

In the embodiment according to FIG. 2 is the window 2 both on the surface and on the lower side of the paper 1 through the film 3 and a transparent paper covered or that with the paper 1, eg by gluing, firmly connected. The film 3 or The transparent paper can also be over the entire surface of the paper, ie up to the paper edges. It is also possible, the window only on one side of the paper by a film 3 or to cover a layer of transparent paper. This foil or Layer of transparent paper is then either at the top or at the bottom of the paper (Fig. 4).