| 摘要 |
The invention relates to a protective element usable as a transparent window in an object to be protected, a method to making thereof and a method of verification object's authenticity with said protective element. According to the method of making a protective element there provided a substrate (1) transparent in visible and ultra-violet spectral region, a latent image (2) is imprinted at least one portion of the substrate (1) on of the sides thereof using a colorless liquid composition comprising UV absorber with red spectrum edge absorption within 370-400 nanometer; a latent image (2') is imprinted on the other side of the substrate (1) using a colorless liquid composition comprising UV absorber with red spectrum edge absorption within 270-360 nanometer, so that latent images (2) and (2') on both sides of the substrate (1) are arranged independently of each other and/or arranged in the predetermined agreed position relative each other enabling to provide a complex image at visualization thereof, subject the obtained latent image (2), (2') to curing at 70-80°C, a protective thin layer (3) transparent in UV spectrum region is applied on both sides of the substrate (1) through the entire surface thereof, wherein the reflective power of the protective layer (3) substantially coincides with the reflective power of the substrate (1) material and the latent images (2), (2') providing invisibility of the latent images outline forming with the naked eye, build in the obtained substrate (1) as a transparent window in an object to be protected. In the method of verification object's authenticity with said protective element the object with protective optic element is placed between a UV light source and a screen fluorescent under the UV light and in irradiation the protective element by light with the predetermined wave length there provided visualization of portions with latent image as dark image (5) at a luminous screen (4). |
