| 摘要 |
The invention concerns a security optical component for authenticating a document or a product, comprising a transparent plastic film (11) embossed to display at least a diffraction grating, the embossed surface (3) being at least partly coated with a layer of dielectric material (4) with high optical index, producing a coloured effect of a first colour for a first orientation of the component and a different second colour for the orientation perpendicular to the first orientation. The invention is characterized in that the layer (4) is coated on the side opposite to the direction of observation with a layer with low optical index (5) then with a coloured contrast layer (2) including transparent zones and coloured zones. |
