Security document with an optical security area

Details Security document with an optical security area Security document with an optical security area

2006-02-07

2006-02-07

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Holographic system or element

Authentication

C359S001000, C359S558000, C382S100000, C283S086000

Reexamination Certificate

active

06995883

ABSTRACT:
A security document, such as a banknote, includes an optical security area having a first periodic optical structure and a security sign provided on the security area and configured to circumscribe a second periodic optical structure which is disposed in offset relationship to the first periodic optical structure. Arranged on the security area is a see-through element for enhancing recognizability of the security sign on the security area. The see-through element defines hereby a viewing zone which covers part of the security sign so as to render this part of the security sign visible by the naked eye.

REFERENCES:
patent: 6317226 (2001-11-01), Yeh et al.
patent: 2004/0076310 (2004-04-01), Hersch et al.
patent: 0 384 897 (1990-08-01), None
patent: WO 99/01291 (1999-01-01), None
patent: WO 02/00446 (2002-01-01), None

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