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United States of America
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Dec 24, 2024
Grant Date -
Sep 1, 2022
app pub date -
Aug 1, 2020
filing date -
Aug 1, 2020
priority date (Note) -
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Abstract
A planar non-imaging optical element (10) for a solar concentrator is described. Groups of circular and concentrically arranged microstructures (35) are arranged to refract light incident normal to the plane (504) of the optical element (10) towards the centre point (502). The angle of the microstructures (35) with respect to the plane (504) of the optical element (10) within each group increases with increasing radial distance from the centre point (502) and are selected such that upon normally incident light (60) they to form a focal area common to all of the groups at a focal plane (506) of the optical element (10) and further selected such that the light refracted from the smallest radial distance from the centre point (502) within a given group and the light refracted from the largest radial distance from the centre point (502) within a given group cross at a plane (518) closer to the optical element (10) than is the focal plane (506).
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