Optially variable surface pattern
US5032003A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Nov 28, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2270/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An article of manufacture including an optically variable surface pattern is disclosed. The optical surface pattern makes visible one out of a plurality of N image representations for each one out of N predetermined viewing directions. The surface pattern comprises M grating elements, each of the grating elements being divided into N grating element sub-portions. Each of the N sub-portions of each grating element contains a diffraction element in the form of a relief structure with predetermined parameters for diffracting incident light. Each of the sub-portions of each grating element thereby corresponds to one pixel of one of the N image representations, so that one of the N image representations is visible from each of said predetermined viewing directions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.