Pancake lenses using Fresnel surfaces
US10845597B1 · kind B1 · utility
8Cited by
7References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 30, 2018 |
| Grant date | Nov 24, 2020 |
| Priority date | — |
| Expiry date | Aug 7, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/012
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head-mounted display includes a pancake lens block. The pancake lens block includes a first waveplate to form first nonlinearly polarized light, a Fresnel surface to reflect and transmit a portion of the first nonlinearly polarized light, a second waveplate to form first linearly polarized light, and a linear reflective polarizer to transmit linear polarized light of a particular polarization rotation direction and to reflect light of other polarization rotation directions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.