Form birefringent grating structure, viewer, anticounterfeit...

Details Form birefringent grating structure, viewer, anticounterfeit... Form birefringent grating structure, viewer, anticounterfeit...

2005-07-27

2009-02-17

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Polarization without modulation

Depolarization

Reexamination Certificate

active

07492517

ABSTRACT:
The invention relates to an anticounterfeiting device comprising a form birefringent surface relief structure bearing a colored three-dimensional polarization image. The structure may be composed of pixels whose surface relief microstructure and composition determines the direction and color of zero-order diffracted light visible from each pixel when the structure is illuminated with polarized light and viewed through an analyzer that passes light of the opposite polarization.

REFERENCES:
patent: 5493555 (1996-02-01), Kimura et al.
patent: 5694247 (1997-12-01), Ophey et al.
patent: 2003/0128349 (2003-07-01), Unno
patent: 2004/0095637 (2004-05-01), Nikolov et al.
patent: 2004/0223156 (2004-11-01), McGrew et al.
patent: 2005/0259302 (2005-11-01), Metz et al.

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