| 摘要 |
The utility model refers to a variable optical element and is used as a protective element for verification of the authenticity and uniqueness of documents, packages, labels or brands. It consists of a hologram (1), including the holographic fields (2) with different dates and destination of the holographic grating (3) and in the illumination with monochromatic beam (4) formed on the screen (5) placed in a selected range of Rn diffracted light, field (6) of bright dots (7) with approximately equal intensity. The beautiful bright dots (7) do not correspond to the location of the holographic fields (2), reflecting formed them monochromatic beam (4). Optical properties of some of the holographic fields (2) are modified so that the modified holographic fields (2 ') in lighting with monochromatic beam do not form bright points (7) and to illuminate the hologram (1) with a monochromatic beam (4) on the screen (5) placed in a certain order Rn, where N ? 0 is displayed at least a certain hidden image (8). |
