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US 11,002,890 B1Granted
Optical layers for fresnel surfaces
AssigneeFacebook Technologies, LLC
InventorsEvan M. Richards, Kurt Allen Jenkins
Life of this patent
Estimating the term…
Abstract
An optical element includes a Fresnel surface including valleys between Fresnel segments. Compensation trenches disposed in the valleys are configured to accept excess of an optical layer received in the valleys during a deposition of the optical layer. The compensation trenches are filled with the optical layer.
Claims14
A Fresnel lens comprising:
- a refractive material;
- a Fresnel surface formed in the refractive material, wherein the Fresnel surface includes valleys between Fresnel segments of the Fresnel surface;
- an optical layer disposed on the Fresnel surface;
- and
- compensation trenches filled with the optical layer, the compensation trenches disposed in the valleys between the Fresnel segments, wherein a slope of each of the Fresnel segments increases as the Fresnel segments get farther from a distance from a central lens of the Fresnel lens, and wherein each of the compensation trenches is configured to increase in volume as the distance from the central lens increases to receive greater volumes of the optical layer that accumulates in the valleys of the Fresnel segments due to the slope of the Fresnel segments increasing as the distance from the central lens increases.
2 more elements
A Head Mounted Display (HMD) comprising:
- a display for providing image light;
- and
- a lens assembly configured to receive the image light and create a virtual image for viewing by an eye of a wearer of the HMD, wherein the lens assembly includes a Fresnel lens comprising:
- a refractive material having a first index of refraction;
- a Fresnel surface formed in the refractive material, wherein the Fresnel surface includes valleys between Fresnel segments of the Fresnel surface;
- an optical layer disposed on the Fresnel surface, wherein the optical layer includes a second index of refraction different from the first index of refraction;
- and
- compensation trenches filled with the optical layer, the compensation trenches disposed in the valleys between the Fresnel segments, wherein a slope of each of the Fresnel segments increases as the Fresnel segments get farther from a distance from a central lens of the Fresnel lens, and wherein each of the compensation trenches is configured to increase in volume as the distance from the central lens increases to receive greater volumes of the optical layer that accumulates in the valleys of the Fresnel segments due to the slope of the Fresnel segments increasing as the distance from the central lens increases.
5 more elements
A Fresnel lens comprising:
- a refractive material;
- a Fresnel surface formed in the refractive material, wherein the Fresnel surface includes valleys between Fresnel segments of the Fresnel surface;
- an optical layer disposed on the Fresnel surface;
- and
- compensation trenches filled with the optical layer, the compensation trenches disposed in the valleys between the Fresnel segments, wherein a volume of each of the compensation trenches increases as a slope of the Fresnel segment adjacent to the compensation trench increases.
2 more elements
Dependencies are inferred from the claim text.