Anti-counterfeiting process using lenticular optics and color masking
US5303370A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1992 |
| Grant date | Apr 12, 1994 |
| Priority date | — |
| Expiry date | Nov 13, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/086
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An image of a symbol or other indicium of origin or authenticity is encrypted, and printed on the item or a label in superposition with a color mask. In a preferred embodiment, an intermediate parallax record is formed of a series of images of a symbol or other indicium, each differing from the preceding one by a predetermined amount of parallax (i.e. change of viewing angle.) A multiple exposure of the series of intermediate parallax record images is made through a lenticular screen to create the encrypted image of the indicium. The lenticular screen and the medium on which the multiple exposure is made are moved relative to each other between exposures. The encrypted image and the superimposed color mask are then printed as a composite image to produce an unintelligible criss-cross of colored lines. When viewed through a lenticular screen which matches that used to create the encrypted image, the original indicium is revealed in clear form.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.