Fresnel lens, Fresnel lens unit, and head-up display
US10670780B2 · kind B2 · utility
1Cited by
1References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2017 |
| Grant date | Jun 2, 2020 |
| Priority date | — |
| Expiry date | Apr 28, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0118
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The present invention provides a Fresnel lens that can reduce generation of concentric stray light. The Fresnel lens includes a sawtooth corrugated face that is formed by alternately disposing a first face inclined relative to optical axis A and a second face substantially parallel to optical axis A, and a light shielding mask is formed at a position corresponding to the second face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.