| 摘要 |
Method for the production of an optically variable image including an animated element used as the model for the reproduction of a security element, by insolation of a light-sensitive material (8) through two coherent light beams (22, 24). The image is broken down into a plurality of elementary images, each corresponding to an optical effect defined by a colour, the time when the image elements appear and their duration. A plurality of masks (15) is provided, each including a number of windows defining an elementary image. Two light beams (22, 24) are used to light the entire substrate surface (8) and the substrate (8) is insolated by successively placing each mask (15) on the substrate (8) and in the path of said light beams (22, 24). The first light beam (22) is stationary while the second light beam (24) is emitted from an illumination surface with adjustable dimensions and position, so as to produce a given optical effect for each elementary image. |
