Diffractive indicia for a surface
First Claim
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1. Diffractive indicia for a surface, comprising:
- (a) a plurality of small separate diffractive elements, and(b) means for adhering the diffractive elements to the surface, wherein;
each diffractive element has, before being applied to the surface a diffractive surface relief structure;
the diffractive elements, when applied to the surface, are not separately resolvable to the human eye; and
the appearance of the diffractive indicia, when applied to the surface, changes when the viewing angle and/or angle of illumination relative to the surface changes.
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Abstract
Diffractive indicia for a surface (1) comprising a plurality of small separate diffractive elements (2) and means for a adhering the diffractive elements to the surface. Each diffractive element has a diffractive surface relief structure and is not separately resolvable to the human eye. The appearance of the diffractive indicia, when applied to the surface, changes when the viewing angle and/or angle of illumination relative to the surface changes. In preferred arrangements, the diffractive indicia, are incorporated in an ink or a transfer medium. A palette of diffractive indicia with different characteristic colours and other optical properties may be provided.
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Citations
14 Claims
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1. Diffractive indicia for a surface, comprising:
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(a) a plurality of small separate diffractive elements, and (b) means for adhering the diffractive elements to the surface, wherein; each diffractive element has, before being applied to the surface a diffractive surface relief structure; the diffractive elements, when applied to the surface, are not separately resolvable to the human eye; and the appearance of the diffractive indicia, when applied to the surface, changes when the viewing angle and/or angle of illumination relative to the surface changes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification