Interference security image structure
US10288787B2 · kind B2 · utility
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1References
19Claims
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Assignee
Inventors
Key dates
| Filing date | Dec 16, 2015 |
| Grant date | May 14, 2019 |
| Priority date | — |
| Expiry date | Nov 3, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/12
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The interference filter structure has a filter with a top side and a bottom side, a partially reflecting/transmitting thin metal layer, dielectric spacers on each sides of the partially transparent layer and a semi-absorbing film on at least a portion of top side or bottom side of the dielectric spacers. The filter provides a reflection mode when observed from the top or bottom side and light transmission is side independent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.