OPTICAL DEVICES DYNAMICALLY VARYING EXTERIOR PRINTED IN SHAPED MAGNETIC FIELD AND INCLUDING PRINTED FRESNEL STRUCTURES Russian patent published in 2011 - IPC B05D5/06 B42D15/10 C09D7/12 

FIELD: physics.

SUBSTANCE: protective device comprises assemblage of n>1000 magnetically smoothed flakes that make image. Said flakes rest on substrate in first pattern to form ring or curve. Note here that said flakes are inclined at first angle to substrate while planes that extend flakes surfaces intersect to make image look like 3D object. Note here that bright or dark spot displaces over image on inclining protective device.

EFFECT: optically varying images using magnetically smoother flakes in presence of magnetic fields.

18 cl, 74 dwg