Optical system
US12153219B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2020 |
| Grant date | Nov 26, 2024 |
| Priority date | — |
| Expiry date | Nov 27, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0161
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Optical systems for displaying an image are described. The optical systems include a first and second optical lenses separated by air. A partial reflector is disposed on and conforms to a major surface of the first optical lens where the major surface can have a best-fit spherical radius of curvature in a range from 20 mm to 200 mm. A reflective polarizer is disposed on and conforms to a major surface of the first optical lens where the major surface can have a best-fit spherical radius of curvature greater than about 500 mm. A retarder layer is disposed between the reflective polarizer and the partial reflector. The first optical lens can have an optical birefringence of less than 15 nm/cm and the second optical lens can have an optical birefringence of greater than 15 nm/cm. A method of fabricating an optical assembly is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.