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AssigneeThe Commonwealth of Australia Commonwealth Scientific and Industrial Research Organisation
InventorRobert Arthur Lee
Estimating the term…
An optical device which generates an optically variable image, the image being optically variable in that it varies according to the position of observation, is manufactured by dividing an optically invariable image into multiple pixels. Color component values are determined for each pixel. For each of the pixels of the optically invariable image, there is determined an associated pixel surface structure which has a three-dimensional surface shape and curvature which is related via a mathematical of computer algorithm to the color component values of the associated pixel in the optically invariable image, each pixel surface structure being an individual reflective or diffractive surface structure which produces an observable optical effect. An assembly of the reflective or diffractive pixel surface structures is produced which when illuminated generates a plurality of observable optical effects which combine to form an optically variable reproduction of the optically invariable image.
A method of manufacturing an optical device which generates an optically variable image, the image being optically variable in that it varies according to the position of observation, the method including the steps of:
An optical device providing in optically variable image, corresponding to an optically invariable counterpart image, the optical device including a pixellated reflective structure which is an assembly of non-diffractive reflective surface relief pixels, wherein the optical device when illuminated generates the optically variable image, the image being optically variable in that it varies according to the position of observation, wherein each of the non-diffractive reflective surface relief pixels is an individual reflecting surface structure, and wherein the optically variability is produced by differing angular orientations of the individual non-diffractive reflective surface relief pixels.
Dependencies are inferred from the claim text.