| 摘要 |
In a process for the mass production of holograms for security purposes, regions (1, 2, 3 ...) of a photosensitive material are fed in turn through an exposure position (5) at which a respective unique hologram is formed in each region by interference between a reference coherent light beam (9) and a coherent light beam (8) bearing an image. The image is partially or wholly changed for each successive region, and may be carried by an updatable display, such as a liquid crystal display. |
