FIELD: physics, alarm and protection.
SUBSTANCE: invention relates to a protective document (1), which has a transparent window (12) in which a first optical element (15) is assembled, and a second transparent window (13) in which a second optical element (16) is assembled. The first transparent window (12) and second transparent window (13) are assembled at the base (11) of the protective document (1) in a spaced relative position such that, the first and second optical elements (15, 16) can be brought into an overlapping relative position. The first optical element (15) has a first transmission field of microlenses, and the second optical element (16) has a second transmission field of microlenses. The first optical effect arises upon superposition of the second field of microlenses with the first field of microlenses.
EFFECT: increased level of protection of the document.
17 cl, 11 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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|
RU2596948C2 |
