公开(公告)号：US20230144296A1

公开(公告)日：2023-05-11

申请号：US17521446

申请日：2021-11-08

Applicant: Meta Platforms Technologies, LLC

Inventor： Xingzhou TU ,  Brian WHEELWRIGHT ,  Alexander SOHN ,  Weichuan GAO ,  Ying GENG ,  Jacques GOLLIER

IPC: G02B3/08 ,  G02B27/30

CPC classification number: G02B3/08 ,  G02B27/30 ,  G02B2003/0093

Abstract: A system includes a light outputting device configured to output a divergent light. The system also includes a lens configured to convert the divergent light incident thereon from a first side of the lens to a collimated light substantially covering a light receiving region located at a second side of the lens, the lens including a plurality of Fresnel structures formed on at least one of a first lens surface or a second lens surface of the lens. Each Fresnel structure includes a slope facet and a draft facet. At least one of the draft facets is a first type of draft facet configured to not interact with a ray of the divergent light that is non-parallel with the at least one of the draft facets.