Signaling device for traffic signals
US6970296B2 · kind B2 · utility
3Cited by
28References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 12, 2002 |
| Grant date | Nov 29, 2005 |
| Priority date | — |
| Expiry date | Nov 18, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A signaling device includes a light source and a Fresnel optical system. Constructed in the form of ellipses on its rear side, the Fresnel optical system has defocusing lenses that form elongated focal areas in the focal plane. Despite the use of a light source of small lateral extent, the signaling device has a radiation characteristic with a large aperture angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.