LiDAR device
First Claim
1. A lidar device for measuring a distance to an obstacle within a field of view having a vertical direction and a horizontal direction and being formed by a plurality of scanning points, the device comprising:
- a laser emitting unit including a plurality of VCSEL (Vertical Cavity Surface Emitting Laser) elements arranged in a form of array and emitting a laser beam;
a first metasurface including a plurality of first beam steering cells arranged in a first form of one-dimensional array along a first direction, wherein the plurality of the first beam steering cells guide the laser beam along a first steering direction corresponding to one of the vertical direction and the horizontal direction by using nanopillars disposed on an emission surface side of the laser emitting unit;
a second metasurface including a plurality of second beam steering cells arranged in a second form of one-dimensional array along a second direction perpendicular to the first direction, wherein the plurality of the second beam steering cells guide the laser beam along a second steering direction corresponding to another of the vertical direction or the horizontal direction by using nanopillars disposed on an emission surface side of the laser emitting unit;
wherein the nanopillars included in the plurality of the first beam steering cells form a first subwavelength pattern,wherein the first subwavelength pattern includes an increment of a first attribute repeated along the first steering direction, the first attribute being related to at least one of a first width, a first height, and a first number per unit length of the nanopillars, andwherein a first change rate of the first attribute is greater in a first specific cell of the first beam steering cell than at a second specific cell of the first beam steering cell when an angle of the first steering direction of the first specific cell is greater than that of the second specific cell,wherein the nanopillars included in the plurality of the second beam steering cells form a second subwavelength pattern,wherein the second subwavelength pattern includes an increment of a second attribute repeated along the second steering direction, the second attribute being related to at least one of a second width, a second height, and a second number per unit length of the nanopillars, andwherein a second change rate of the second attribute is greater in a third specific cell of the second beam steering cell than at a fourth specific cell of the second beam steering cell when an angle of the second steering direction of the third specific cell is greater than that of the fourth specific cell.
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Accused Products
Abstract
A lidar device comprises: a laser emitting unit for including a plurality of VCSEL elements emitting a laser beam; a metasurface for including a plurality of beam steering cells arranged in a form of two-dimensional array by a row direction and a column direction, wherein the plurality of beam steering cells guide the laser beam by using nanopillars; wherein the nanopillars included in the plurality of beam steering cells form a subwavelength pattern, wherein the increase of an attribute related to at least one of the width, height, and number per unit length of the nanopillars is repetitive along the direction from the center of the metasurface to the position of the row corresponding to the plurality of beam steering cells.
59 Citations
12 Claims
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1. A lidar device for measuring a distance to an obstacle within a field of view having a vertical direction and a horizontal direction and being formed by a plurality of scanning points, the device comprising:
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a laser emitting unit including a plurality of VCSEL (Vertical Cavity Surface Emitting Laser) elements arranged in a form of array and emitting a laser beam; a first metasurface including a plurality of first beam steering cells arranged in a first form of one-dimensional array along a first direction, wherein the plurality of the first beam steering cells guide the laser beam along a first steering direction corresponding to one of the vertical direction and the horizontal direction by using nanopillars disposed on an emission surface side of the laser emitting unit; a second metasurface including a plurality of second beam steering cells arranged in a second form of one-dimensional array along a second direction perpendicular to the first direction, wherein the plurality of the second beam steering cells guide the laser beam along a second steering direction corresponding to another of the vertical direction or the horizontal direction by using nanopillars disposed on an emission surface side of the laser emitting unit; wherein the nanopillars included in the plurality of the first beam steering cells form a first subwavelength pattern, wherein the first subwavelength pattern includes an increment of a first attribute repeated along the first steering direction, the first attribute being related to at least one of a first width, a first height, and a first number per unit length of the nanopillars, and wherein a first change rate of the first attribute is greater in a first specific cell of the first beam steering cell than at a second specific cell of the first beam steering cell when an angle of the first steering direction of the first specific cell is greater than that of the second specific cell, wherein the nanopillars included in the plurality of the second beam steering cells form a second subwavelength pattern, wherein the second subwavelength pattern includes an increment of a second attribute repeated along the second steering direction, the second attribute being related to at least one of a second width, a second height, and a second number per unit length of the nanopillars, and wherein a second change rate of the second attribute is greater in a third specific cell of the second beam steering cell than at a fourth specific cell of the second beam steering cell when an angle of the second steering direction of the third specific cell is greater than that of the fourth specific cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A lidar device whose a field of view being formed by a plurality of scanning points distributed in a vertical direction and a horizontal direction, the device comprising:
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a laser emitting unit including a plurality of VCSEL (Vertical Cavity Surface Emitting Laser) elements arranged in a form of array and emitting a laser beam; a first metasurface including a plurality of first beam steering cells arranged in a first form of one-dimensional array along a first direction, wherein the plurality of the first beam steering cells guide the laser beam along a first steering direction corresponding to one of the vertical direction and the horizontal direction by using nanopillars disposed on an emission surface side of the laser emitting unit; a second metasurface including a plurality of second beam steering cells arranged in a second form of one-dimensional array along a second direction perpendicular to the first direction, wherein the plurality of the second beam steering cells guide the laser beam along a second steering direction corresponding to another of the vertical direction or the horizontal direction by using nanopillars disposed on an emission surface side of the laser emitting unit; wherein the nanopillars included in the plurality of the first beam steering cells form a first subwavelength pattern, wherein the first subwavelength pattern includes an increment of a first attribute repeated along the first steering direction, the first attribute being related to at least one of a first width, a first height, and a first number per unit length of the nanopillars, and wherein a first change rate of the first attribute is greater in a first specific cell of the first beam steering cell than at a second specific cell of the first beam steering cell when an angle of the first steering direction of the first specific cell is greater than that of the second specific cell, wherein the nanopillars included in the plurality of the second beam steering cells form a second subwavelength pattern, wherein the second subwavelength pattern includes an increment of a second attribute repeated along the second steering direction, the second attribute being related to at least one of a second width, a second height, and a second number per unit length of the nanopillars, and wherein a second change rate of the second attribute is greater in a third specific cell of the second beam steering cell than at a fourth specific cell of the second beam steering cell when an angle of the second steering direction of the third specific cell is greater than that of the fourth specific cell.
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11. A lidar device for measuring a distance to an obstacle within a field of view having a vertical direction and a horizontal direction and being formed by a plurality of scanning points, the device comprising:
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a laser emitting unit including a plurality of VCSEL (Vertical Cavity Surface Emitting Laser) elements arranged in a form of array and emitting a laser beam; a first metasurface including a plurality of first beam steering cells arranged in a first form of one-dimensional array along a first direction, wherein the plurality of the first beam steering cells guide the laser beam along a first steering direction corresponding to one of the vertical direction and the horizontal direction by using nanopillars disposed on an emission surface side of the laser emitting unit; a second metasurface including a plurality of second beam steering cells arranged in a second form of one-dimensional array along a second direction perpendicular to the first direction, wherein the plurality of the second beam steering cells guide the laser beam along a second steering direction corresponding to another of the vertical direction or the horizontal direction by using nanopillars disposed on an emission surface side of the laser emitting unit; wherein the nanopillars included in the plurality of the first beam steering cells form a first subwavelength pattern, wherein the first subwavelength pattern includes an increment of a first attribute repeated along the first steering direction, the first attribute being related to at least one of a first width, a first height, and a first number per unit length of the nanopillars, and wherein a first change rate of the first attribute is greater in a first specific cell of the first beam steering cell than at a second specific cell of the first beam steering cell when a distance from a center of the first metasurface to the first specific cell is greater than a distance from the center of the first metasurface to the second specific cell, wherein the nanopillars included in the plurality of the second beam steering cells form a second subwavelength pattern, wherein the second subwavelength pattern includes an increment of a second attribute repeated along the second steering direction, the second attribute being related to at least one of a second width, a second height, and a second number per unit length of the nanopillars, and wherein a second change rate of the second attribute is greater in a third specific cell of the second beam steering cell than at a fourth specific cell of the second beam steering cell when a distance from a center of the second metasurface to the third specific cell is greater than a distance from the center of the second metasurface to the fourth specific cell. - View Dependent Claims (12)
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Specification