| 摘要 |
A security document comprises a polymer substrate having first and second surfaces. At least one opacifying layer is provided on the first and/or second surface of the substrate, and a plurality of laterally-spaced window regions are provided, each window region being defined by a gap in at least one of the opacifying layer(s), at least one of the opacifying layers being present between the laterally-spaced window regions. Each of the plurality of window regions contains a security device comprising at least an optically variable effect generating relief structure on the first or second surface of the substrate, and each of the respective security devices exhibits an optically variable effect of different appearance from one another. |
