OPTICAL INFORMATION CARRIER

摘要

An optical information carrier is in the form of a composite laminate having diffractive first relief structures (10) embossed into the underside (4) of the carrier foil (3) to produce visual optical-diffractive effects and optionally diffractive second relief structures (10) embossed into the top side (5) of the carrier foil (3). The top side (5) are provided with an optically effective relief structure (7) formed by layers of a dielectric (9) which form a machine readable information by covering or exposing the relief structure (15) of the underside (4) along a data track. A lacquer layer (29) covers the dielectric layers (9) and the neighbouring parts of the top side (5). The dielectric layers (9) differ in refractive index from the refractive indices of the adjoining materials of the carrier foil (3) and the lacquer layer (29). The materials of the carrier foil (3) and the lacquer layer (29) may have the same refractive index and allow light impinging on the top side (5) to penetrate at least partially into the composite laminate.