Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2006-09-05
2006-09-05
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S569000, C359S572000, C359S002000, C359S576000, C283S094000
Reexamination Certificate
active
07102823
ABSTRACT:
A diffractive security element (2) is divided into surface portions, having an optically effective structure (9) at interfaces embedded between two layers of a layer composite (1) of plastic material. At least the base layer (4), which is to be illuminated, of the layer composite (1) is transparent. The optically effective structure (9) as a base structure has a zero order diffraction grating with a period length of at most 500 nm. In at least one of the surface portions an integrated optical waveguide (5) with a layer thickness (s) of a transparent dielectric is embedded between the base layer (4) and an adhesive layer (7) of the layer composite (1) and/or a protective layer (6) of the layer composite (1), wherein the profile depth of the optically effective structure (9) is in a predetermined relationship with the layer thickness (s). Upon illumination with white incident light (13) the security element (2) produces light (14) which is diffracted in the zero diffraction order, of high intensity and with an intensive color.
REFERENCES:
patent: 4426130 (1984-01-01), Knop
patent: 4484797 (1984-11-01), Knop et al.
patent: 4856857 (1989-08-01), Takeuchi et al.
patent: 4892385 (1990-01-01), Webster et al.
patent: 5886798 (1999-03-01), Staub et al.
patent: 3308831 (1984-05-01), None
patent: 0 105 099 (1984-04-01), None
patent: 0 375 833 (1990-07-01), None
patent: 0 534 795 (1993-03-01), None
patent: 0 895 100 (1999-02-01), None
patent: WO 83/00395 (1983-02-01), None
patent: WO 99/47983 (1999-09-01), None
Rudolf L. van Renesse, “Optical Document Security”, Second Edition, pp. 274-287, Artech House, 1998.
Schilling Andreas
Staub Rene
Tompkin Wayne Robert
Assaf Fayez G.
Hoffmann & Baron , LLP
OVD Kinegram AG
LandOfFree
Diffractive security element having an integrated optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Diffractive security element having an integrated optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffractive security element having an integrated optical... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3545345