FIELD: optics.
SUBSTANCE: present invention relates to a thin optical protective element containing a reflecting or refractive light-redirecting surface, the relief pattern whereof is capable of redirecting incident light from a light source and forming a projected image on the projection surface, wherein the optical parameters of said optical protective element comply with a specific projection criterion so that the projected image comprises a caustic pattern reproducing a reference image easily visually recognisable by a person. The present invention also relates to a method for manufacturing a relief pattern of the optical protective element.
EFFECT: creation of a thin optical protective element with a light-redirecting surface.
13 cl, 16 dwg
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