Wavelength plate and optical device
US10317599B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Mar 15, 2016 |
| Grant date | Jun 11, 2019 |
| Priority date | — |
| Expiry date | Oct 26, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/093
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wavelength plate, wherein first birefringent layer and second birefringent layer are laminated such that in-plane directions of optical axes of first birefringent layer and second birefringent layer cross each other, wherein the wavelength plate satisfies formulae (1), (2), (3), and (4), and wherein at least one of first birefringent layer and second birefringent layer is obliquely-deposited birefringent layer formed by oblique deposition, Δn1×t1=λ/2 (1)1.7≤(Δn1×t1)/(Δn2×t2)≤2.7 (2)5°≤θ1≤30° (3)(2θ1+35°)≤θ2≤(2θ1+50°) (4)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.