| 摘要 |
<p>An optical device to simulate three-dimensional display, primarily for use in advertising, comprises an assembly to be illuminated by a light box (1) provided with a diffuser screen (3). The assembly comprises a pair of photographic transparencies (5 and 6) carrying reduced - density images (5A, 6A) spaced apart by approximately 1 millimeter by means of a spacer sheet (8). The rear transparency (6) is bonded to a backing sheet (9) and a front sheet (7) protects the front transparency (6). The assembly may be illuminated by ambient light, in which case a reflector is provided behind the backing sheet and the spacer sheet is slightly opalescent. </p> |
