Diffractive indicia for a surface
AssigneeCommonwealth Scientific and Industrial Research Organisation
InventorRobert Arthur Lee
Life of this patent
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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.
Claims14
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.
Dependencies are inferred from the claim text.