Street lighting device
US8469552B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 11, 2011 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Nov 11, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device for streets, paths, and the like, includes a lighting unit containing a lighting element and a lens arranged in front of the lighting element in the main emission direction to produce a specified light distribution characteristic. The lens includes a light entrance surface on a light entrance side facing the lighting element and a light exit surface on a light exit side facing away from the lighting element, at which surfaces the light is refracted. The light entrance surface and/or the light exit surface of the lens is shaped in a direction transverse to the optical axis of the lighting element in such a way that the luminous intensity of the coupled out light, starting from a center plane that intersects with the optical axis, rises with an increasing emission angle from the optical axis at least partially according to a tangent function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.