FIELD: technological processes.
SUBSTANCE: image is created inside a sheet material containing a monolayer of a variety of glass microbeads, partially submerged in a phosphor layer and coated with a layer of metallized foil when laser radiation is pulsed through the foil layer. To create an original colour protective image inside the sheet material, each laser radiation pulse within the laser spot consistently evaporates the metal layer from the metallized foil, metal microlenses are partially bombarded with metal particles, partially immersed in the phosphor layer, microlenses are fused together with the phosphor and metal particles, the inlet of channel is melted and closed on surface of the foil, formed by the pulse of laser radiation, a bunch of fused microlenses, phosphor particles and metal is formed, colour point of the security image of crystal structures is created within the laser spot, after termination of the pulse laser light. This point from the side of the foil in reflected light will be coloured in a dark colour, and in transmitted light it will turn into the colour of foil metal. When the laser beam is scanned over a given area of the surface of the sheet material, laser pulses are repeatedly applied to specified points on foil surface and an image inside the sheet material is created that is visible as dark in reflected light, and in transmitted light consisting of many crystal-like structures either isolated from each other, or bounded by solidified fibers of glass melt with phosphor and metal particles.
EFFECT: colour palette does not depend on the colour of phosphor with a sharp contrast between the mappings of this image in transmitted and reflected light.
2 cl, 4 dwg
