Back to results
US 11,454,747 B1Granted
Shadow-matched Fresnel lens doublet for reduced optical artifacts
AssigneeMeta Platforms Technologies, LLC
InventorsBrian Wheelwright, Jacques Gollier
Life of this patent
Estimating the term…
Abstract
A lens assembly includes a first lens and a second lens. The first lens has a first lens surface and a second lens surface opposite to the first lens surface. The second lens surface includes a first plurality of Fresnel structures. The second lens, coupled to the first lens, has a third lens surface and a fourth lens surface opposite to the third lens surface. The third lens surface includes a second plurality of Fresnel structures. The third lens surface faces the first lens and the second lens surface faces the second lens. A headset that includes a display and the lens assembly is also disclosed. A method of transmitting, with the lens assembly, light from the display toward an image plane is also disclosed.
Claims20
A lens assembly, comprising:
- a first lens having a first lens surface and a second lens surface opposite to the first lens surface, the second lens surface including a first plurality of Fresnel structures, wherein the first plurality of Fresnel structures includes a first Fresnel structure with (i) a first slope facet characterized by a first slope angle and (ii) a first draft facet;
- and
- a second lens coupled with the first lens, the second lens having a third lens surface and a fourth lens surface opposite to the third lens surface, the third lens surface including a second plurality of Fresnel structures, wherein the second plurality of Fresnel structures includes a second Fresnel structure with (i) a second slope facet characterized by a second slope angle and (ii) a second draft facet, wherein:
- the third lens surface faces the first lens and the second lens surface faces the second lens;
- and
- the first slope angle is distinct from the second slope angle so that the first Fresnel structure receives a first light and directs a portion of the first light through the first slope facet to the second slope facet of the second Fresnel structure without transmitting the first light through the first slope facet to the second draft facet.
3 more elements
A headset, comprising:
- a display;
- and
- a lens assembly that includes:
- a first lens having a first lens surface and a second lens surface opposite to the first lens surface, the second lens surface including a first plurality of Fresnel structures, wherein the first plurality of Fresnel structures includes a first Fresnel structure with (i) a first slope facet characterized by a first slope angle and (ii) a first draft facet;
- and
- a second lens coupled with the first lens so that at least a portion of light transmitted through the first lens is transmitted through the second lens, the second lens having a third lens surface and a fourth lens surface opposite to the third lens surface, the third lens surface including a second plurality of Fresnel structures, wherein the second plurality of Fresnel structures includes a second Fresnel structure with (i) a second slope facet characterized by a second slope angle and (ii) a second draft facet, wherein:
- the first lens and the second lens are configured to project light from the display to an image plane;
- and
- the first slope angle is distinct from the second slope angle so that all rays of the light projected from a respective location of the display to the image plane passes through a respective slope facet of the first plurality of Fresnel structures pass through a corresponding slope facet of the second plurality of Fresnel structures.
6 more elements
A method, comprising:
- transmitting, with a lens assembly, light from a display toward an image plane, wherein the lens assembly includes:
- a first lens having a first lens surface and a second lens surface opposite to the first lens surface, the second lens surface including a first plurality of Fresnel structures;
- a second lens coupled with the first lens, the second lens having a third lens surface and a fourth lens surface opposite to the third lens surface, the third lens surface including a second plurality of Fresnel structures;
- a respective Fresnel structure of the first plurality of Fresnel structures has a slope facet and a draft facet;
- and
- a respective Fresnel structure of the second plurality of Fresnel structures has a slope facet and a draft facet,
- wherein:
- transmitting the light from the display toward the image plane includes transmitting a respective ray from a respective location of the display to the image plane through a respective slope facet of the first plurality of Fresnel structures and a corresponding slope facet of the second plurality of Fresnel structures;
- and
- the respective slope facet of the first plurality of Fresnel structures is characterized by a first slope angle that is distinct from a second slope angle that characterizes the corresponding slope facet of the second plurality of Fresnel structures so that all of the rays transmitted from the display to the image plane pass through respective slope facets of the first plurality of Fresnel structures and respective slope facets of the second plurality of Fresnel structures.
7 more elements
Dependencies are inferred from the claim text.