PROTECTION ELEMENT FOR PROTECTED DOCUMENT AND METHOD OF ITS FABRICATION Russian patent published in 2011 - IPC D21H21/44 B32B29/00 

Abstract RU 2422572 C2

FIELD: physics.

SUBSTANCE: protected document comprises structural layer and first and second diffraction relief structures. Note here that said relief structures, if seen parallel with structural layer plane, stay at different levels of protection element. Note also that first relief structure borders first reflecting layer, while second relief structure borders second partially reflecting layer. Besides, if spectator faces first reflecting layer, second data generated by second relief structure is partially hidden, while, if spectator faces second reflecting layer, partially hidden is first data generated by first relief structure.

EFFECT: higher degree of protection.

15 cl, 26 dwg

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RU 2 422 572 C2

Authors

Attner Juri

Shtaub Rene

Veber Klaus

Dates

2011-06-27Published

2008-02-07Filed