| 摘要 |
A multilayer identification card in which information in the form of patterns, letters, numbers and/or pictures is inscribed by means of a laser recorder in a laser transformable layer of the identification card which is made of plastic and is transparent in the visible spectral range. The material of this laser transformable layer is adapted to the laser recorder in such a way that it absorbs the laser energy strongly enough in the wavelength of the laser beam transformations such as discoloration, microbubble formation, etc., take place locally in the material, rendering the applied information very clearly visible and immune to falsification in the otherwise transparent layer. This layer which bears the information can either be designed as a transparent identification card cover layer or be covered by another plastic layer which is transparent both visually and for the laser recorder. |
