Security element and process for producing the same

Details Security element and process for producing the same Security element and process for producing the same

2005-04-29

2010-02-23

Lavarias, Arnel C (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C359S506000

Reexamination Certificate

active

07667894

ABSTRACT:
A security element for securing value documents has a first light-polarizing layer that is present at least in some areas and includes a cholesteric liquid crystal material, that selectively reflects light having a predetermined circular polarization, and that selectively reflects light of a firs wavelength range in a first reflection direction and light of a second wavelength range having a second, different reflection direction. A second light-polarizing layer is present at least in some areas and selectively reflects light having the opposite circular polarization to the predetermined circular polarization and selectively reflects light of the first and second wavelength range in the first and second reflection direction, respectively. A semi-transparent filter layer on which the first and second light-polarizing layer are stacked, absorbs light from the visible spectral range and transmits light from the first and/or second wavelength range.

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