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US 11,237,389 B1Granted
Wedge combiner for eye-tracking
AssigneeFacebook Technologies, LLC
InventorsRobin Sharma, Andrew John Ouderkirk
Life of this patent
Estimating the term…
Abstract
An optical system includes a first optical element having at least a first optical surface and a second optical surface, the first optical surface is not parallel to the second optical surface. The optical system includes a plurality of optical elements positioned adjacent to the second optical surface of the first optical element. The respective optical element of the plurality of optical elements is configured to receive light transmitted through the first optical surface at a first angle with respect to the second optical surface and direct the light back toward the first optical surface at a second angle, that is distinct from the first angle, with respect to the second optical surface.
Claims20
An optical system comprising:
- a first optical element having at least a first optical surface and a second optical surface, wherein the first optical surface is not parallel to the second optical surface;
- and
- a plurality of optical elements positioned adjacent to the second optical surface of the first optical element, wherein:
- a respective optical element of the plurality of optical elements is configured for at least one of the following:
- receiving light transmitted through the first optical surface at a first angle with respect to the second optical surface and direct the light back toward the first optical surface at a second angle, that is distinct from the first angle, with respect to the second optical surface;
- or
- receiving light guided through the first optical element at a third angle with respect to the second optical surface and direct the light toward the first optical surface at a fourth angle, that is distinct from the third angle, with respect to the second optical surface;
- the light guided through the first optical element is from a light source and enters the first optical element through a third optical surface of the first optical element;
- the light directed toward the first optical surface at the fourth angle with respect to the second optical surface exits the first optical element through the first optical surface of the first optical element to illuminate an object;
- and
- the first optical element has a shape of a wedge and the third optical surface has a surface area that is smaller than both a surface area of the first optical surface and a surface area of the second optical surface.
8 more elements
An optical system, comprising:
- a first optical element having at least a first optical surface and a second optical surface, wherein the first optical surface is not parallel to the second optical surface;
- and
- a plurality of optical elements positioned adjacent to the second optical surface of the first optical element, wherein:
- a respective optical element of the plurality of optical elements is configured for at least one of the following:
- receiving light transmitted through the first optical surface at a first angle with respect to the second optical surface and direct the light back toward the first optical surface at a second angle, that is distinct from the first angle, with respect to the second optical surface;
- or
- receiving light guided through the first optical element at a third angle with respect to the second optical surface and direct the light toward the first optical surface at a fourth angle, that is distinct from the third angle, with respect to the second optical surface;
- the light guided through the first optical element is from a light source and enters the first optical element through a third optical surface of the first optical element;
- a first portion of the light exits the first optical element at a first location on the second optical surface toward a respective optical element of the plurality of optical elements, and a second portion of the light exits the first optical element at a second location on the second optical surface, the first location on the second optical surface being spatially separated from the second location on the second optical surface;
- and
- the light directed toward the first optical surface at the fourth angle with respect to the second optical surface exits the first optical element through the first optical surface of the first optical element to illuminate an object.
8 more elements
An optical system, comprising:
- a first optical element having at least a first optical surface and a second optical surface, wherein the first optical surface is not parallel to the second optical surface;
- and
- a plurality of optical elements positioned adjacent to the second optical surface of the first optical element, wherein:
- a respective optical element of the plurality of optical elements is configured for at least one of the following:
- receiving light transmitted through the first optical surface at a first angle with respect to the second optical surface and direct the light back toward the first optical surface at a second angle, that is distinct from the first angle, with respect to the second optical surface;
- or
- receiving light guided through the first optical element at a third angle with respect to the second optical surface and direct the light toward the first optical surface at a fourth angle, that is distinct from the third angle, with respect to the second optical surface;
- the respective optical element of the plurality of optical elements directs light having a first wavelength and transmits light having a second wavelength, the first wavelength being longer than 750 nm, and the second wavelength being shorter than 750 nm;
- and
- the respective optical element of the plurality of optical elements has a spatially varying refractive index profile.
7 more elements
Dependencies are inferred from the claim text.