PROTECTIVE DOCUMENT Russian patent published in 2009 - IPC G07D7/12 

FIELD: physics, alarm and protection.

SUBSTANCE: invention relates to a protective document (7), which contains a first transparent region (72), in which a first transparent optical element (74) is assembled, and a second transparent region (71) in which a second non-transparent optical element (73) is assembled. The second non-transparent optical element (73) exhibits the first optical effect. The first region (72) and the second region (71) are assembled in a spaced relative position at the base (75) of the protective document such that, the first and second regions can be brought into an overlapping relative position. When the second optical element is covered by the first optical element with the first distance (26) between the first and second optical elements, the second optical effect results, and when the second optical element is covered by the first optical element with the second distance (25) between the first and second optical elements, which is greater than the first distance (26), a third optical effect (51) results, which is different from the second optical effect.

EFFECT: increased protection.

13 cl, 11 dwg