Optical pattern projection
AssigneePrimesense Ltd.
InventorsAlexander Shpunt, Benny Pesach
Life of this patent
Estimating the term…
Abstract
Optical apparatus includes first and second diffractive optical elements (DOEs) arranged in series to diffract an input beam of radiation. The first DOE is configured to apply to the input beam a pattern with a specified divergence angle, while the second DOE is configured to split the input beam into a matrix of output beams with a specified fan-out angle. The divergence and fan-out angles are chosen so as to project the radiation onto a region in space in multiple adjacent instances of the pattern.
Claims26
Optical apparatus, comprising first and second diffractive optical elements (DOEs) arranged in series to diffract an input beam of radiation,
- wherein the first DOE is configured to apply to the input beam an uncorrelated pattern of spots with a specified divergence angle, while the second DOE is configured to split the input beam into a matrix of output beams with a specified fan-out angle, and
- wherein the divergence and fan-out angles are chosen so as to project the radiation onto a region in space in multiple adjacent instances of the uncorrelated pattern of the spots.
Mapping apparatus, comprising:
- a projection subassembly, comprising:
- a radiation source, which is configured to generate an input beam of radiation;
- and
- first and second diffractive optical elements (DOEs) arranged in series to diffract the input beam, wherein the first DOE is configured to apply to the input beam an uncorrelated pattern of spots with a specified divergence angle, while the second DOE is configured to split the input beam into a matrix of output beams with a specified fan-out angle, so as to project the radiation onto a region in space;
- an image capture subassembly, which is configured to capture an image of the pattern appearing on an object in the region;
- and
- a processor, which is configured to process the image so as to produce a three-dimensional (3D) map of the object.
A method for projection, comprising:
- directing an input beam of radiation to pass in series through first and second diffractive optical elements (DOEs),
- wherein the first DOE is configured to apply to the input beam an uncorrelated pattern of spots with a specified divergence angle, while the second DOE is configured to split the input beam into a matrix of output beams with a specified fan-out angle, and
- wherein the divergence and fan-out angles are chosen so as to project the radiation onto a region in space in multiple adjacent instances of the uncorrelated pattern of the spots.
Dependencies are inferred from the claim text.