Optically variable devices

Optical: systems and elements – Lens – With support

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Reexamination Certificate

active

07830627

ABSTRACT:
A security device comprises a substrate (1) having an array of microlenses (3) on one side and one or more corresponding arrays of microimages (4) on the other side. The microimages (4) are located at a distance from the microlenses (3) substantially equal to the focal length of the microlenses. The substrate (1) is sufficiently transparent to enable light to pass through the microlenses (3) so as to reach the microimages (4). Each microimage (4) is defined by an anti-reflection structure on the substrate (1) formed by a periodic array of identical structural elements, light passing through the substrate and impinging on the microimages being reflected to a different extent than light which does not impinge on the microimages thereby rendering the microimages visible.

REFERENCES:
patent: 4013465 (1977-03-01), Clapham et al.
patent: 4856857 (1989-08-01), Takeuchi et al.
patent: 4892336 (1990-01-01), Kaule et al.
patent: 5248544 (1993-09-01), Kaule
patent: 5442482 (1995-08-01), Johnson et al.
patent: 5503902 (1996-04-01), Steenblik et al.
patent: 5712731 (1998-01-01), Drinkwater et al.
patent: 6062604 (2000-05-01), Taylor et al.
patent: 6089614 (2000-07-01), Howland et al.
patent: 6273473 (2001-08-01), Taylor et al.
patent: 6288842 (2001-09-01), Florczak et al.
patent: 6381071 (2002-04-01), Dona et al.
patent: 6473238 (2002-10-01), Daniell
patent: 6570710 (2003-05-01), Nilsen et al.
patent: 2002/0051866 (2002-05-01), Mullen
patent: 2002/0054434 (2002-05-01), Florczak et al.
patent: 2003/0179364 (2003-09-01), Steenblik et al.
patent: B-24213/84 (1984-08-01), None
patent: B-63921/86 (1987-04-01), None
patent: 0 238 043 (1987-09-01), None
patent: 0 279 880 (1988-08-01), None
patent: 0 319 157 (1989-06-01), None
patent: 0516790 (1992-12-01), None
patent: 0548142 (1993-06-01), None
patent: 0632767 (1995-01-01), None
patent: 0 698 256 (1996-02-01), None
patent: 0 860 298 (1998-08-01), None
patent: 1141480 (2001-10-01), None
patent: WO 83/00659 (1983-03-01), None
patent: WO 92/04692 (1992-03-01), None
patent: WO 92/11142 (1992-07-01), None
patent: WO 93/24333 (1993-12-01), None
patent: WO 97/47478 (1997-12-01), None
patent: WO 98/15418 (1998-04-01), None
patent: WO 98/25236 (1998-06-01), None
patent: WO 99/01291 (1999-01-01), None
patent: WO 99/28852 (1999-06-01), None
patent: WO 00/39391 (2000-07-01), None
patent: WO 01/23943 (2001-04-01), None
patent: WO 01/63341 (2001-08-01), None
patent: WO 03/095188 (2003-11-01), None
Hutley, et al; (1994); “The moiré magnifier”; Pure Appl. Opt. 3; pp. 133-142.
Amidror; (2000); “The Theory of the Moiré Phenomenon”; Kluiver Academic Publishers; ISBN 0-7923-5949-6.
Renesse, et al; (2004); “Optical Security and Counterfeit Deterrence Techniques V”; Proceedings of Electronic Imaging SPIE;. vol. 5310; pp. 321-327.
Herzig, et al; (1997); “Micro-optics. Elements, systems and applications”; Institute of Micortechnology; pp. 128-177.
Lalanne, et al; (2003); “Artificial Media Optical Properties—Subwavelength Scale”; Encyclopedia of Optical Engineering; pp. 62-71.
Michel, et al; (2001); “Printing meets lithography: Soft approaches to high-resolution patterning”; IBM J. Res & Dev; vol. 45 (5) pp. 697-719.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Optically variable devices does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optically variable devices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optically variable devices will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-4186013

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.