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US 2014/0211469 A1Published application
Diffusing lens and planar light source having diffusing lens to increase light uniformity
AssigneeHon Hai Precision Industry Co., Ltd.
InventorYUNG-LUN HUANG
Life of this patent
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Abstract
A diffusing lens includes a first surface and a second surface facing away from the first surface. The first surface has a first negative Fresnel structure for diffusing light from a point light source. The second surface has a second negative Fresnel structure aligning with the first negative Fresnel structure and for further diffusing the light of the point light source.
Claims14
A planar light source, comprising:
- a substrate;
- an array of point light sources positioned on the substrate;
- and
- an array of diffusing lenses positioned on the substrate, each diffusing lens covering a corresponding one of the point light sources and comprising a first surface facing the corresponding point light source and a second surface facing away from the first surface;
- the first surface having a first negative Fresnel structure aligning with the corresponding point light source, the second surface having a second negative Fresnel structure aligning with the first negative Fresnel structure.
2 more elements
A diffusing lens, comprising:
- a first surface having a first negative Fresnel structure for diffusing light from a point light source;
- and
- a second surface facing away from the first surface and having a second negative Fresnel structure aligning with the first negative Fresnel structure and for further diffusing the light of the point light source.
Dependencies are inferred from the claim text.