Printed matter – Having revealable concealed information – fraud preventer or...
Patent
1996-03-27
1998-12-22
Fridie, Jr., Willmon
Printed matter
Having revealable concealed information, fraud preventer or...
283 91, B42D 1500
Patent
active
058510320
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a composite image arrangement, comprising a pattern and a further pattern, substantially parallel to the first pattern, each comprising a plurality of visually contrasting regions, the patterns being in fixed positions relative one to the other on either side of a light transmissive lamina, the visually contrasting regions of at least one pattern comprising relatively more and relatively less light transmissive regions, the patterns being aligned one to the other such that if viewed together in transmission through the said at least one pattern in a given direction relative to a normal to the plane of the patterns an image is produced which appears using normal vision to be non-random.
BRIEF DESCRIPTION OF THE INVENTION
The invention finds particular, though not exclusive, application to documents of value for the deterrence of counterfeiting. Composite image arrangements are employed in banknotes of certain currencies (for example the German Mark), but such currently used techniques still do not present a high degree of deterrence to counterfeiting because the nature of the images used enables the result of their combination to be predicted and replicated using known techniques. The image when viewed through the banknote does not change with angle of view.
An object of the present invention is to enable these disadvantages to be mitigated.
According to a first aspect of the invention a composite image arrangement as defined in the first paragraph above is characterized in that the pattern and the further pattern are such that if they are viewed in isolation using normal vision each appears substantially random.
The image may be visible only in a given range of angles relative to the normal to a pattern. The patterns may each comprise a material (such as, for example, an ink) carried on a major surface of a light transmissive lamina (such as, for example, a sheet of paper).
According to a second aspect of the invention there is provided a method of manufacturing a composite image arrangement, comprising (a) providing a pattern comprising relatively more and relatively less light transmissive regions, the pattern appearing random using normal vision, (b) providing an image pattern comprising relatively more and less light transmissive regions, the image pattern appearing non-random using normal vision, (c) combining the pattern and the image pattern using a combining function forming a further pattern comprising relatively more and less light transmissive regions, the further pattern appearing substantially random using normal vision, and (d) aligning and fixing in place the first-mentioned pattern and the further pattern to give an approximation of the image pattern when viewed together in transmission in a given direction relative to the normal to the plane of the random patterns.
The combining function may be, for example a modulo two sum, a logical operator such as "exclusive or", or a photographic process which performs a similar function.
A composite image arrangement having some similarities with the present invention is disclosed in U.S. Pat. No. 4,586,711 as part of a matching card game in which a transparent lamina with one random pattern is given to a prospective customer and a further pattern is placed on goods in a shop to encourage the prospective customer to enter the shop and match up the cards to win a prize. In this case the pattern is fairly coarse grained, precise alignment is not required, and the position of the two patterns is not fixed.
BRIEF DESCRIPTION OF THE DRAWINGS
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying schematic drawings in which:
FIG. 1 shows an image pattern.
FIG. 2 shows a pattern appearing random using normal vision.
FIG. 3 shows a further pattern appearing random using normal vision.
FIG. 4 shows a simulation of the image obtained by aligning FIG. 2 and FIG. 3 and viewing together in transmission.
FIG. 5 shows a cross-section of a first embodiment.
FIG. 6 shows a flow di
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Central Research Laboratories Limited
Fridie Jr. Willmon
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