Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1995-10-12
1998-02-03
Loney, Donald
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
428161, 428164, 428172, 428201, 428203, 428206, 428209, 4285422, 428 421, 428 418, B32B 300
Patent
active
057142319
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a decorative layer structure which has at least one transparent cover lacquer layer which at its surface that is concealed in use is provided at least in a region-wise manner with a spatial structure having an optical-diffraction effect, and a reflecting layer at least in the region of the spatial structure. In addition the invention concerns the use of a decorative layer structure of that kind.
2. Description of Prior Art
Decorative layer structures or arrangements of the above-mentioned kind are very widely used for example as security elements for value documents such as for example banknotes, credit cards, identity cards or tickets. In that respect the term `spatial structure having an optical-diffraction effect` means structures which produce quite specific effects by diffraction or refraction of the incident light. Structures of that kind having an optical-diffraction effect may be for example holograms, computer-generated diffraction structures, interference layers or diffraction gratings.
DE 41 30 896 A1 discloses a composite layer arrangement of the kind mentioned in the opening part of this specification, in which a dielectric with a refractive index of N=2.5 is used as a reflection layer. The lacquer layers which adjoin the structure having the optical-diffraction effect, at both sides thereof, are each provided over the entire surface area, in the known composite layer arrangement.
German laid-open application (DE-CS) No 23 52 366 discloses an identity card which is provided in a region-wise manner with a spatial structure having an optical-diffraction effect. In that arrangement, two layers having substantially identical refractive indices enclose in a region-wise manner a layer of material whose refractive index differs from that of the two enclosing layers. The spatial structure having the optical-diffraction effect is provided in the one layer only in the region in which the material with the different refractive index is present.
In general structures of that kind having an optical-diffraction effect are applied to the document to be safeguarded in such a way that they cover over only a limited area thereof. Stamping or punch members of a suitable configuration are usually employed to produce decorative layer structures having such optical-diffraction structures which occupy only a restricted area. Now, particularly when, in addition to the structure having the optical-diffraction effect, other security elements, for example a special item of printing, are also to be provided, the problem arises of accurately mutually aligning the stamping or punch member for producing the structure having the optical-diffraction effect, relative to the other security elements, for example the printing. Accordingly, hitherto either a comparatively high degree of inaccuracy in registration of the various security elements with each other had to be tolerated, or a comparatively large amount of waste occurs in the course of manufacture, in spite of low working speeds.
OBJECT OF THE INVENTION
The object of the present invention is now to afford remedies in this respect and to propose a possibility which allows structures having an optical-diffraction effect of the above-discussed kind to be provided in a decorative layer structure only in a region-wise manner, but nonetheless while being able to apply additional security elements, for example a special item of printing, with a very high degree of accuracy, at relatively high production speeds, or being able to produce at least highly accurate positioining of the structures which have an optical-diffraction effect and which are present only in a region wise manner.
SUMMARY OF THE INVENTION
To attain that object, in accordance with the invention, it is proposed that a decorative layer structure of the above-mentioned kind is so-designed that provided in a region-wise manner between the surface of the cover lacquer layer, said surface having the spatial structure having an optic
REFERENCES:
patent: 4629647 (1986-12-01), Sauder
patent: 4717615 (1988-01-01), Reinhart
patent: 4856857 (1989-08-01), Takeuchi et al.
patent: 4945215 (1990-07-01), Fukushima et al.
patent: 5010243 (1991-04-01), Fukushima et al.
Leonhard Kurz GmbH & Co.
Loney Donald
Marn Louis E.
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