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US 5,851,032 AGranted
Composite image arrangement
AssigneeCentral Research Laboratories Limited
InventorIan Macdonald Green
Life of this patent
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Abstract
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.
Claims13
A composite image arrangement comprising:
- a light transmissive lamina;
- a first pattern arranged on a first side of said lamina, said first pattern comprising a first plurality of visually contrasting regions which, viewed in isolation using normal vision, appears substantially random;
- and
- a second pattern arranged substantially parallel to the first pattern on a second side of said lamina, said second pattern being aligned in a predetermined relationship to said first pattern and held in a fixed position relative to said first pattern, and said second pattern comprising a second plurality of visually contrasting regions which viewed in isolation using normal vision, appears substantially random;
- wherein
- the visually contrasting regions of at least one pattern comprise relatively more and relatively less light transmissive regions;
- and
- arrangement of said first and second pluralities of visually contrasting regions in said first and second patterns is such that when the patterns are aligned with one another in said predetermined relationship, and are viewed together in transmission through the at least one pattern within a predetermined range of angles with respect to a predetermined direction relative to a normal to a surface of the lamina, an image is produced which appears to be non-random using normal vision.
5 more elements
A method of manufacturing a composite image arrangement, comprising:
- providing a first pattern comprising a first plurality of relatively more and relatively less light transmissive regions which appear random using normal vision;
- providing an image pattern comprising relatively more and less light transmissive regions which appear non-random using normal vision;
- combining the first pattern and the image pattern using a combining function to form a second pattern comprising a second plurality of relatively more and less light transmissive regions which appear random using normal vision, arrangement of said first and second pluralities of relatively more and less light transmissive regions in said first and second patterns being such that when the patterns are aligned with one another in a predetermined relationship, and are viewed together in transmission within a predetermined range of angles with respect to a given direction relative to a normal to a contour of the patterns, an approximation of the image pattern is produced;
- and
- aligning and fixing in place the first and second patterns in said predetermined relationship.
2 more elements
Dependencies are inferred from the claim text.