Phase retarder comprising two optically anisotropic layers
US6519016B1 · kind B1 · utility
14Cited by
4References
9Claims
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Key dates
| Filing date | Sep 21, 2000 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Jul 7, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/08
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A phase retarder comprises two optically anisotropic layers A & B. The optically anisotropic layer A essentially gives the phase retardation of &pgr; at wavelength of 550 nm, and the optically anisotropic layer B essentially gives the phase retardation of &pgr;/2 at wavelength of 550 nm. The layers A and B are laminated so that the retarder has such an optical characteristic that a retardation value per wavelength is within the range of 0.2 to 0.3 at each wavelength of 450 nm, 550 nm and 650 nm. The total thickness of the layers A and B is within the range of 500 nm to 20 &mgr;m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.