Low-beam lamp unit
US8439539B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 2011 |
| Grant date | May 14, 2013 |
| Priority date | — |
| Expiry date | Aug 15, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/365
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed is a low-beam lamp unit including an LED, a projector lens disposed on an optical axis, a reflector reflecting light of the LED toward the vicinity of a back focus of the projector lens on a vertical cross section, a shade having a front edge portion disposed in the vicinity of the back focus of projector lens to block a portion of light reflected by the reflector, and a re-reflection surface integrally provided in the back of the front edge portion to re-reflect the portion of reflected light blocked by the shade to the projector lens. In the low-beam lamp unit, at least a portion of the re-reflection surface has a light diffusion portion which is a continuously curved surface that is convex toward the reflector in the vertical cross section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.