Lighting device having polychromatic light source and optical element with light filter having through hole
US10746357B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2016 |
| Grant date | Aug 18, 2020 |
| Priority date | — |
| Expiry date | Nov 30, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device includes a polychromatic light source for emitting light in a plurality of colors, a light filter, and an optical element, wherein the light filter and the optical element are sequentially provided in an optical path of the polychromatic light source; a through hole is provided in the light filter, and the through hole has a size smaller than that of light spots of the polychromatic light source reaching the through hole; and the optical element is used for adjusting the light spots. Since the through hole has a size smaller than that of the light spots of the polychromatic light source reaching the through hole, the light filter can block stray light around the light spots such that more uniform portion of the light spots passes through the through hole, thereby improving the light-emitting effect of the lighting device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.