The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2010
Filed:
Apr. 28, 2005
Lawrence George Commander, Reading, GB;
Christopher John Eastell, Berkshire, GB;
Roland Isherwood, Hampshire, GB;
Brian William Holmes, Hampshire, GB;
Lawrence George Commander, Reading, GB;
Christopher John Eastell, Berkshire, GB;
Roland Isherwood, Hampshire, GB;
Brian William Holmes, Hampshire, GB;
De La Rue International Limited, Basingstoke, Hampshire, GB;
Abstract
A security device comprises a substrate () having an array of microlenses () on one side and one or more corresponding arrays of microimages () on the other side. The microimages () are located at a distance from the microlenses () substantially equal to the focal length of the microlenses. The substrate () is sufficiently transparent to enable light to pass through the microlenses () so as to reach the microimages (). Each microimage () is defined by an anti-reflection structure on the substrate () 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.