| 摘要 |
Identification card, in particular a driving licence. On the back thereof, where the categories of vehicles to be driven are recorded, an additional security means is provided to prevent said categories from being imperceptibly ^altered. This security means consists of a series of cylindrical lenses located next to one another. Therebelow is provided a laser- writable layer wherein the relevant categories may be written. Below said laser-writable layer or at the same level there is attached a series of lines. The lines are attached with a frequency equal to, or a whole number of times less or greater than, the lens diameter. On tilting of the card thus obtained and, more particularly, the back thereof and the portion configured in the above-described manner, a moire pattern of the relevant lines is produced for the user but the information relating to the category of vehicles to be driven remains in the stationary position. |
