Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1997-11-18
2000-12-26
Yamnitzky, Marie
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428200, 428206, 428209, 428344, 428352, 428457, 428690, 428916, 428 418, 283 57, 283 86, 283 92, 2504861, B32B 516, B42D 1500
Patent
active
061655929
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a document, for example, a bank note, check, credit card, identification document or ticket which has an optical security attribute in the form of a light-reflecting or diffracting and/or refracting layer, for example, a hologram, an interference layer, a (computer-generated) diffraction structure or the like over at least regions of the document, whereby the optical security attribute is provided with doping material and is formed in a foil structure which is applied to the document by means of an adhesive layer and optionally has at least one transport layer in the foil structure.
Further, the invention encompasses a foil structure for producing such documents and which comprises a carrier film and a transfer layer releasable from the carrier film and in which the embossed optical-security attributes forming light-reflecting or diffracting and/or refracting layer, is formed especially as an embossed foil, preferably as a hot-embossed foil, and has on the side of the reflecting layer turned away from the carrier film, an adhesive layer, whereby at least one transparent layer can be arranged in the foil structure.
BACKGROUND OF THE INVENTION
Documents of the kind mentioned initially herein are known especially from Swiss patent 661 602. To produce such value documents, embossed foils, especially hot-embossed foils, can serve as described for example in German patent document 34 22 910 C1.
Known documents or embossed foils have a structure serving as a security attribute above all against color copying and effective in an optical diffraction sense, the optically diffractive, i.e. light-reflecting diffractive and/or refractive structure having the basic advantage that it can be recognized by the unaided eye but also can be machine read. Typical of such structures are those which are applied to bank notes and are, inter alia, kinegrams and pixelgrams. The falsification of such structures is very difficult but nevertheless can be carried out when it is possible to free the structured surface from the document and galvanically reproduce it utilizing the original as a model or to copy it by photographic techniques.
To make documents secure against falsification, the use of luminescent layers in the documents has been proposed. German patent document DE-OS 37 41 179 discloses the use of two security attributes, namely, one embossed in the paper and thus providing a sensible relief, and further, as a second security attribute, luminescent substances upon the crests or in the valleys of the relief. According to German patent document DE-OS 37 41 179 use is made of a transfer band whose layers are applied by an adhesive layer upon the document, the transfer band containing a color layer of a luminescent material but also in addition to this luminescent layer a color pigment layer.
German patent document DE-OS 39 06 695 shows embedding of a strip in a document as a security element. The strip is comprised of a light-permeable plastic foil which is provided with indicia or patterns in the form of recesses whereby additionally luminescent substances are disposed in regions which are equal in coverage to the recesses. In this case, two security elements are provided, namely one formed by the indicia and patterns while the other is formed by the luminescent substances.
German patent document DE-PS 27 54 267 documents with two security attributes and which have luminescent characteristics. By contrast with brilliant surface optical markings, here there are threads, platelets and fibers embedded in the paper.
The state of the art which has become known, can be summarized by saying that it is known to apply luminescent substances on the one hand in use regions of nonoptical features by (partial) printing, coating, embossing or also by transferring strip applications and, on the other hand, in use regions of the optical means (for example reflective grid structure with line counts of about 100/mm and line depths of about .mu.m), for securing documents with surface-covering protective layers.
In ea
REFERENCES:
patent: 4014602 (1977-03-01), Ruell
patent: 4151667 (1979-05-01), Idelson et al.
patent: 4677285 (1987-06-01), Taniguchi
patent: 4705300 (1987-11-01), Berning et al.
patent: 4758296 (1988-07-01), McGrew
patent: 5093184 (1992-03-01), Edwards
patent: 5851615 (1998-12-01), Kay
Patent Abstracts of Japan, Publication No. JP 000595, Publication Date May 93.
Patent Abstracts of Japan, Publication No. JP4191096, Publication Date Jul. 92.
Berger Erich
Fajmann Peter
Dubno Herbert
Oesterreichische Nationalbank
Yamnitzky Marie
LandOfFree
Document with doped optical security attribute, layer composite does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Document with doped optical security attribute, layer composite , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Document with doped optical security attribute, layer composite will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-992319