Efficient white lamp for vehicle headlight
US10527247B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2019 |
| Grant date | Jan 7, 2020 |
| Priority date | — |
| Expiry date | Apr 16, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01K9/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An incandescent lamp for a vehicle headlight comprising a transparent vessel that encloses at least one filament and the vessel is at least partly covered with a coating. The coating comprises at least one pigment, which is arranged such that light emitted by the at least one filament and traversing the coating is transformed to transformed light. The transformed light is characterized by a chromaticity according to the CIE 1931 xy-chromaticity with y being in between the Planckian locus and y=0.5*x+0.205 and 0.36<x<0.42, and wherein the at least one pigment comprises a mixture of Co—Al oxide and Co—Al—Cr oxide, the mixture being characterized by a ratio of a concentration in mass percentage Cm(Co—Al oxide) of Co—Al oxide and a concentration in mass percentage Cm(Co—Al—Cr oxide) of Co—Al—Cr oxide in the coating of 90/10≥Cm(Co—Al oxide)/Cm(Co—Al—Cr oxide)≥30/70.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.