Anticopying film

Details Anticopying film Anticopying film

1995-02-13

1998-08-18

Loney, Donald

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428148, 428163, 428168, 428172, 428173, 428206, 428207, 428913, 428916, 283 72, 283902, 430496, B32B 328, G03C 100, B42D 1500

Patent

active

057956430

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF INVENTION

1. Field of Invention
The present invention relates to an anticopying film or layer, consisting of a film or of a layer of transparent material having a large number of partially or completely nontransparent regions which are arranged distances apart and whose planes are arranged in about the same predetermined position relative to the surfaces of the film or of the layer so that, from a predetermined viewing angle onto the surfaces of the anticopying film, the latter is essentially transparent.
2. Description of the Related Art
An anticopying film of the type defined as above is described in U.S. Pat. No. 3,887,742. Such a film, which is intended to permit copy-proof documents, is effective in concealing graphic information and/or characters of a document or a text generally, in the vertical viewing direction as occurs in a copier, and in rendering visible the graphic information and/or characters at a predetermined different viewing angle, relative to the plane of the document.
In practice, such an anticopying film is a transparent plastics film containing nontransparent particles or having a surface which is notched in any manner or has a sawtooth-shaped cross-section, wherein a first oblique or vertical surface is either black or reflecting from a vertical viewing angle, relative to the plane of the film or of the document, and the other oblique surface is transparent at a different viewing angle, so that the information or characters are legible. Such notched or sawtooth-shaped surfaces are very difficult to produce since the surfaces must first be embossed or beaten and the oblique surfaces must then be provided with a black or reflecting material, it being necessary for the accuracy of these operations to be so high that the transparent surfaces do not suffer, ie. are likewise provided partially with black and reflecting material. In a further embodiment, black ink which covers at least a part of the background is provided in the valley between two successive teeth in a film surface having a sawtooth-shaped cross-section. Here too, no practical production processes have been described.
An anticopying medium for written or printed matter is disclosed in AU-A-610 614, wherein the medium contains a photosensitive ink system which, when exposed in a photocopier, renders the text illegible or makes the copy clearly distinguishable from the original, so that either the original becomes worthless or is clearly recognizable as having been copied.


SUMMARY OF INVENTION

It is an object of the present invention to provide an anticopying film or an anticopying layer, which film or which layer is simpler to produce and more economical and prevents or at least complicates copying.
We have found that this object is achieved by an anticopying film or layer for documents, consisting of a film or of a layer of transparent material having a large number of partially or completely nontransparent regions which are arranged distances apart and whose planes are arranged in about the same predetermined position relative to the surfaces of the film or of the layer so that, from a predetermined viewing angle onto the surfaces of the film or of the layer, the anticopying film is essentially transparent, wherein the regions consist partially or completely of a material which is photochemically converted into nontransparent or reflecting material.
This considerably simplifies the production of such a film or layer, and there are advantageous possibilities for variation, depending on the particular desired use.
We have found that the object is furthermore achieved in practice by an anticopying film or layer, consisting of a film or of a layer of transparent material having a large number of partially or completely nontransparent regions which are arranged distances apart and whose planes are arranged in about the same predetermined position relative to the surfaces of the film or of the layer so that, from a predetermined viewing angle onto the surfaces of the film or of the layer, the anticopying film

REFERENCES:
patent: 3887742 (1975-06-01), Rennagel
patent: 4025673 (1977-05-01), Rennagal
patent: 4791449 (1988-12-01), Foley et al.
patent: 5204160 (1993-04-01), Runser

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