Dynamic draft for Fresnel lenses
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United States of America Patent
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Jul 17, 2018
Grant Date -
Mar 15, 2018
app pub date -
Sep 13, 2016
filing date -
Sep 13, 2016
priority date (Note) -
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Abstract
A lens includes an optically transparent substrate having a first lens surface and a second lens surface opposite to the first lens surface. The first lens surface includes a plurality of Fresnel structures. A respective Fresnel structure of the plurality of Fresnel structures includes a slope facet and a draft facet. The draft facet is characterized by a draft angle. The draft angle of the respective Fresnel structure is based on a distance of the respective Fresnel structure from a center of the lens.
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