Projector type headlight
US9285092B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 24, 2013 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Apr 7, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S45/47
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A projector type headlight can include a projection lens arranged on an optical axis extending in a longitudinal direction of a vehicle, and a light source unit arranged on a more rear side than a back side focal plane of the projection lens, the projection lens including resin lenses which are arranged on the optical axis. A resin lens out of the resin lenses arranged closer to the light source unit includes a diffraction grating provided on a lens face in a side opposite to a light source, the resin lens out of the resin lenses arranged closer to the light source unit has a lens face having a positive power, which is arranged in a light source side, and the diffraction grating is designed so as to cancel chromatic aberration of light emitted from the light source unit and emitted forward through the resin lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.