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. 11, 2015
Filed:
Nov. 13, 2009
Axel Lundvall, Solna, SE;
Axel Lundvall, Solna, SE;
ROLLING OPTICS AB, Stockholm, SE;
Abstract
An optical device for providing a synthetic integral image () comprises a polymer foil stack. A first interface of the polymer foil stack comprises optically distinguishable image data bearer structures (A-C) in a first array. A second interface of the polymer foil stack has focusing elements () in a second array. A ratio between distances between neighboring objects in the first array and of focusing elements in the second array in a first direction is different from a ratio between distances between neighboring objects in the first array and of focusing elements in second array in a second direction. This leads to that the synthetic integral image corresponding to the image data bearer structures is perceptible with requested proportions when the polymer foil stack is given a certain curvature. Also polymer foil stacks giving rise to synthetic integral image only when viewed from a very short distance are described. The appearance of the synthetic integral image during bending or moving of the polymer foil stack is used for authentication. A change in apparent image depth during rotation is alternatively used for authentication.