Control of light uniformity using fresnel field placement of optical elements
US10208927B2 · kind B2 · utility
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2References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 28, 2017 |
| Grant date | Feb 19, 2019 |
| Priority date | — |
| Expiry date | Sep 30, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An optical emitter providing improved light uniformity. The optical emitter includes a light source and a lens element spaced apart from the light source such that no additional lens elements are positioned therebetween. The lens element includes an inner light-receiving surface within the Fresnel field of the light source. In some embodiments, the light source includes an LED array and the lens element includes a lens array. The optical emitter provides the ability to adjust focus or spot size while not degrading the uniformity of the light intensity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.