Patent ID: 6060143
Filing Date: 2000-05-09
Classification: G06K,Y10S,Y10T

Abstract:
An optical information carrier which is in the form of a composite laminate with a carrier foil and which has microscopically fine relief structures, characterised in that the carrier foil is approximately transparent for light in a predetermined spectral range, that the top side of the carrier foil is provided with a cover layer which is opaque for visible light and which is provided with openings through which light impinging on the top side can penetrate into the composite laminate, that microscopically fine relief structures are formed into the underside the carrier foil, that the underside is coated with a base layer whose refractive index differs from the refractive index of the carrier foil in at least a portion of the electromagnetic spectrum so that the relief structures on the underside at least partially reflect and diffract the light which has penetrated into the composite laminate, that the thickness of the carrier foil is at least 20 micrometers that upon turning and/or tilting the information carrier a viewer sees a changing play of colours, that the structures on the top side have microscopically fine relief structures, and that the relief structures on the top side diffract impinging light at a different angle from the relief structures on the underside.