Projector type headlamp
US10830406B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 15, 2018 |
| Grant date | Nov 10, 2020 |
| Priority date | — |
| Expiry date | May 15, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/143
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The projector-type headlamp comprises a projection lens unit and a light source unit. A diffraction grating designed to eliminate chromatic aberrations is provided on at least part of a lens surface of the lens unit. When an x axis in the horizontal direction and a y axis in the vertical direction are defined on a plane perpendicular to the optical axis, R1 is the maximum y coordinate on the lens surface, and 0≤A<1, an area of the lens surface in which y<A·R1 comprises a curved surface or a flat surface, at least partially provided with the diffraction grating, and an area of the lens surface in which y≥A·R1 comprises a separate curved surface that has a power greater than the power of the curved surface or flat surface, and is not provided with a diffraction grating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.