Title: Security hologram and associated methods of use and of making
Application Number: 200610146475 Application Date: 2006.11.10
Publication Number: 1983079 Publication Date: 2007.06.20
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G03H1/00
Applicant(s) Name: Du Pont Address:
Inventor(s) Name: Molteni William J.
Attorney & Agent: xiangdan
Abstract:
    A security hologram is described that contains an integral image, which is made up of at least a first holographic image, which is located at or near a surface of a recording medium used to record the hologram, and a second holographic image, which is located in either a foreground position or a background position relative to the surface of the recording medium. The at least first and second holographic images fit together like pieces of a jigsaw puzzle to afford the integral image. The second holographic image is viewable and recognizable only with a collimated or at least partially collimated light source having a center wavelength in the visible region of the electromagnetic spectrum and a spectral bandwidth, wherein the spectral bandwidth of the collimated or at least partially collimated light source overlaps the spectral bandwidth of the hologram. Also described are associated methods of use of the hologram in security/authentication applications and a method of making the hologram.
Time: 9