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Fresnel lens barrier rings

  • US 10,054,720 B2
  • Filed: 06/29/2015
  • Issued: 08/21/2018
  • Est. Priority Date: 02/02/2015
  • Status: Active Grant
First Claim
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1. A lens having a surface with a circumference, the lens comprising:

  • a first set of one or more semi-circular grooves in the surface that are not concentric with the circumference of the surface; and

    a second set of one or more grooves in the surface that are concentric with the circumference of the surface and that surround the first set of grooves, wherein an end of at least one groove of the first set of grooves intersects with at least one groove of the second set of grooves.

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