Curved retarder-based optical filters
US8687275B2 · kind B2 · utility
9Cited by
32References
23Claims
0Family size
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Key dates
| Filing date | Oct 10, 2008 |
| Grant date | Apr 1, 2014 |
| Priority date | — |
| Expiry date | Nov 9, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1744
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Curved polarization filters and methods of manufacturing such filters. The method includes laminating a planar polarization layer to a planar retarder layer at a predetermined orientation and bending the laminate to create a curved filter. The strain on the retarder layer results in stress-induced birefringence, and the predetermined orientation of the retarder substantially compensates for the stress-induced birefringence. In some embodiments, the predetermination is based on mathematical models. In some other embodiment, the predetermination is based on experimental data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.