INFORMATION CARD Russian patent published in 1997 - IPC

FIELD: information cards. SUBSTANCE: information card has base 5, adhesive layer 4, metallized light-reflecting layer 3; macrorelief and microrelief are formed at the same time on the reflecting layer. Microrelief is made with variable period within 0.3 to 20.0 um in the form of helical (view A-A) diffraction grating with triangular profile of line rulings. Macrorelief is singled out by area 8 without the microrelief, and line ruling has an asymmetric triangular profile. Diffusion of directional 1,2 white light allows the eye of observer 6,7 to see luminous effects at low observation angles, unusually varying alternation of color and its shape in iridescent spectrum (view B, C), and asymmetry of diffraction patterns, and to see dull macrorelief and its mirror reflection in definite direction. EFFECT: enhanced convenience in use. 2 cl, 3 dwg