Multiple image diffractive device
US6342969B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Jan 29, 2002 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2230/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A pixellated diffractive device includes a multiplicity of pixels (12,22) in turn divided into multiple sub-pixels (13,23). The device is related to one or more pixellated diffraction surface structures which when illuminated generate respective corresponding optically variable images. The sub-pixels (13,23) of each pixel of the diffractive device include diffractive elements (13a,23a) arranged in one or more groups, the diffractive elements of each group matching diffractive elements of a corresponding single pixel of the respective pixellated diffraction surface structures. In each pixel of the device the diffractive elements (13a,23a) of the or each said group are intermixed with other sub-pixels and cooperatively contribute a single element of the corresponding optically variable image which is generated on illumination of the diffractive device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.