Light projecting device having high light utilization efficiency
US10976021B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 2019 |
| Grant date | Apr 13, 2021 |
| Priority date | — |
| Expiry date | Dec 4, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21W2102/135
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light projecting device includes a supporting unit, a first light source, a second light source, a light guiding unit and a lens. The first light source and the second light source are disposed on the supporting unit. The first light source includes a first lighting unit having a first light emitting surface. The second light source includes a second lighting unit having a second light emitting surface. The light emitting direction of the first light emitting surface is opposite to that of the second light emitting surface, and the first light emitting surface is substantially coplanar with the second light emitting surface. The light guiding unit is disposed in front of the supporting unit and the lens is disposed in front of the light guiding unit. Therefore, the light utilization efficiency of the light projecting device can be increased while satisfying requirements for miniaturization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.