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:
Aug. 18, 2015
Filed:
Nov. 28, 2012
Innovia Security Pty Ltd, Craigieburn, Victoria, AU;
Gary Fairless Power, Craigieburn, AU;
INNOVIA SECURITY PTY LTD, Craigieburn, Victoria, AU;
Abstract
A method and apparatus for viewing or authenticating a diffractive device and a diffractive security device () are provided in which a first diffractive relief structure () is responsive to a first wavelength of visible monochromatic light, a second diffractive relief structure () is at least partially interlaced with the first diffractive relief structure () and responsive to a second wavelength of visible monochromatic light, and a third diffractive relief structure () is at least partially interlaced with the first and second diffractive relief structures () and responsive to a third wavelength of visible monochromatic light. Under illumination by the first, second and third wavelengths of monochromatic light, the first diffractive relief structure () produces a first partial image of a first color in a reconstruction plane, the second diffractive relief structure () produces a second partial image of a second color in the reconstruction plane and the third diffractive relief structure () produces a third partial image of a third color in the reconstruction plane, and the first, second and third partial images at least partially overlap in the reconstruction plane to form a multicolored image. The diffractive security device may be used in a security document and the device may be authenticated by comparing the multicolored image to a reference image.