LED vehicle headlamp with electrochromic device
US9128344B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 31, 2013 |
| Grant date | Sep 8, 2015 |
| Priority date | — |
| Expiry date | Dec 22, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/322
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An LED vehicle headlamp includes an LED light source, at least one electrochromic device optically coupled to the LED light source, and a collimator positioned between the LED light source and the electrochromic device. The electrochromic device has an alterable light transmission characteristics in response to voltage/current level applied thereto. The collimator is configured for collimating and converging light emitted from the LED light source and directing light into the electrochromic device. When a forward bias voltage/current is applied to the electrochromic device, the visible light transmission of the electrochromic device decreases accordingly to generate a first light intensity distribution pattern, which is a low beam. When a backward bias voltage/current is applied to the electrochromic device, the visible light transmission of the electrochromic increases accordingly to generate a second light intensity distribution pattern (high beam) different from the first light intensity distribution pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.