Hybrid fresnel lens with increased field of view
AssigneeFacebook Technologies, LLC
InventorsBrian Wheelwright, Jacques Gollier, Melissa Geng
Life of this patent
Estimating the term…
Abstract
A lens defined by a first lens surface and a second lens surface opposite to the first lens surface is disclosed. The lens includes a first portion; and a second portion that is distinct from the first portion and is located around the first portion. The first lens surface for the first portion of the lens is defined by a Fresnel surface profile. The second lens surface for the first portion of the lens is defined by a smooth surface profile. The first lens surface for a second portion of the lens is defined by a Fresnel surface profile. The second lens surface for the second portion of the lens is defined by a Fresnel surface profile.
Claims20
A lens, defined by a first lens surface and a second lens surface opposite to the first lens surface, including:
- a first portion;
- and
- a second portion that is distinct from the first portion and is located around the first portion, wherein:
- the first lens surface for the first portion of the lens is defined by a Fresnel surface profile;
- the second lens surface for the first portion of the lens is defined by a smooth surface profile;
- the first lens surface for a second portion of the lens is defined by a Fresnel surface profile;
- the second lens surface for the second portion of the lens is defined by a Fresnel surface profile;
- and
- a derivative of the smooth surface profile defining the second lens surface for the first portion of the lens adjacent to a junction between the first portion of the lens and the second portion of the lens is substantially the same as a derivative of the Fresnel surface profile defining the second lens surface for the second portion of the lens adjacent to the junction between the first portion of the lens and the second portion of the lens.
Dependencies are inferred from the claim text.