Optical: systems and elements – Lens – With support
Reexamination Certificate
2005-04-28
2010-11-09
Sugarman, Scott J (Department: 2873)
Optical: systems and elements
Lens
With support
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.
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Commander Lawrence George
Eastell Christopher John
Holmes Brian William
Isherwood Roland
De La Rue International Limited
Oliff & Berridg,e PLC
Patel Vipin M
Sugarman Scott J
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