RASTER-MOIRE OPTICAL SYSTEM Russian patent published in 2016 - IPC B42D25/30 G07D7/20 B41F17/00 

FIELD: safety.

SUBSTANCE: invention refers to raster-moire optical system used for protection from counterfeit of secure printing product, and to a method of protection from counterfeit of protected from counterfeit of printed products with the use of this system. Raster-moire optical system ss a combination of two polymer films. One film contains microsurgery hidden information size 30-50 mkm in units of the raster grid. Second film has a raster grid of spherical plane-convex microlenses. On top of the polymer film, which contains microsurgery hidden information in units of the raster grid, one puts a film containing bitmap grid of spherical plane-convex microlens. For visualization of hidden image centers of raster arrays of both are films maximally accurately aligned. To obtain moire picture one puts a raster optical analyzer on the protective element, while smooth changing of angle of rotation of the raster optical analyzer relative to the protective element there are different scale image. Characteristics of the raster grid of optical analyzer must coincide at angle of rotation and line with characteristics of the protective element.

EFFECT: beam path of light received in the focal plane of the raster optical analyzer, recovers complex moire integral image in the object space.

2 cl, 8 dwg