MICRO-OPTICAL SYSTEM FOR FORMING VISUAL IMAGES WITH KINEMATIC MOVEMENT EFFECTS

The microoptical system for the formation of visual images claimed as the invention belongs mostly to the type of devices used for authentication of products, and can be efficiently used to protect bank notes and securities.The microoptical system, according to the claims, consists of fragments of multilevel flat axial Fresnel lenses with a parabolic phase function and diffraction gratings. A special choice of parameters of multilevel Fresnel lenses and diffraction gratings makes it possible to form images with kinematic effects. When the microoptical system is illuminated by a point light source then at diffraction angles smaller than 60° the microoptical system forms an image consisting of black and white stripes, which does not change when the optical element is turned left/right. The kinematic effect consists in the motion of black and white stripes when the microoptical system is tilted up/down. At diffraction angles of more than 60°, the observer sees a different color image throughout the entire area of the microoptical system.The claimed combination of essential features of the invention ensures the achievement of the technical result, which consists in expanding the capabilities of visual control, and in the improvement of the protection of the microoptical system against counterfeit. The implementation of a microoptical visual imaging system is possible using existing standard equipment.