| 摘要 |
The surface is pattern is divided into a rectangular matrix of individual fields (6) containing diffraction elements (8) having a spatial line frequency of more than 10 lines per mm. Each field (6) has a width and length of less than 0.3 mm and is divided into sections (7) each used to represent a respective pixel of the graphical image (3), having a relief structure determined by the optical parameters of the image. - Pref. at least one relief structure profile for the diffraction elements (8) is asymmetrical with the diffraction elements (8) having an azimuth angle of between 0 and 360 degrees. |
