Patent ID: 6822769
Filing Date: 2004-11-23
Classification: B42D,G03H,G07D,G07F

Abstract:
A security device comprising a holographic optically variable effect generating structure having at least two discrete sections, wherein each section generates, in response to white light illumination,a) an optically variable image consisting of at least one defined graphical element located at or near a first image plane either on or adjacent to a plane of the device, and b) at least one discrete covert image, in the form of indicia, in a second image plane located at a distance away from a physical plane of the device such that the at least one discrete covert image is substantially non-visible to the observer; and wherein each section generates, in response to coherent, visible illumination, a) the optically variable image, and b) at least one discrete covert image, the at least one discrete covert image being visible to the observer in the second image plane, the at least one discrete covert image from each of the at least two discrete sections being reconstructed at different angles to a substrate supporting device such that the covert image from each of the at least two discrete sections are spatially separated on the image plane.