Lidar device
AssigneeSOS LAB Co., Ltd.
InventorsJun Hwan JANG, Hee Sun YOON
Life of this patent
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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.
Claims10
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 metasurface including a plurality of beam steering cells arranged in a form of two-dimensional array having a row direction corresponding to the vertical direction and a column direction corresponding to the horizontal direction, wherein the plurality of the beam steering cells guide the laser beam to the plurality of the scanning points by using nanopillars disposed on an emission surface side of the laser emitting unit;
- wherein the nanopillars form a subwavelength pattern in the plurality of the beam steering cells,
- wherein the subwavelength pattern of a specific cell among the plurality of the beam steering cells includes:
- an increment of a first attribute being repeated along a direction from a center of the metasurface to a row of the specific cell and a change rate of the first attribute being increased according to a distance from the row of the specific cell to the center of the metasurface, an increment of a second attribute being repeated along a direction from the center of the metasurface to a column of the specific cell and a change rate of the second attribute being related to a distance from the column of the specific cell to the center of the metasurface, and
- wherein the first attribute is related to at least one of a width, a height, and a number per unit length of the nanopillars, and the second attribute is related to at least one of a width, a height, and a number per unit length of the nanopillars.
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 metasurface including a plurality of beam steering cells guiding the laser beam to the plurality of the scanning points by using nanopillars disposed on an emission surface side of the laser emitting unit;
- wherein the nanopillars form a subwavelength pattern in the plurality of the beam steering cells,
- wherein the subwavelength pattern of a specific cell among the plurality of the beam steering cells includes:
- an increment of a first attribute being repeated along a first component of a steering direction in which the specific cell guides the laser beam and a change rate of the first attribute being increased according to a magnitude of the first component,
- an increment of a second attribute being repeated along a second component of a steering direction in which the specific cell guides the laser beam and a change rate of the second attribute being increased according to a magnitude of the second component, and
- wherein the first component corresponds to the vertical direction of the field of view and the second component corresponds to the horizontal direction of the field of view.
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 metasurface including a plurality of beam steering cells arranged in a form of two-dimensional array having a row direction corresponding to the vertical direction and a column direction corresponding to the horizontal direction, wherein the plurality of the beam steering cells guide the laser beam to the plurality of the scanning points by using nanopillars disposed on an emission surface side of the laser emitting unit;
- wherein the plurality of the beam steering cells include a first cell, a second cell being located at a same row and on a right side of the first cell, and a third cell being located at a same column and on a lower side of the first cell,
- wherein the nanopillars included in each of the first, the second and the third cells form a subwavelength pattern in each of the first, the second and the third cells,
- wherein the subwavelength pattern in each of the first, the second and the third cells includes:
- an increment of a first attribute being repeated along a direction from a center of the metasurface to a row of each of the first, the second and the third cells, respectively, and
- an increment of a second attribute being repeated along a direction from a center of the metasurface to a column of each of the first, the second and the third cells, respectively,
- and wherein the first attribute is related to at least one of a width, a height, and a number per unit length of the nanopillars and the second attribute is related to at least one of a width, a height, and a number per unit length of the nanopillars,
- in case that the first to the third cells are located on a upper left quadrant side among a quadrant of the metasurface,
- a change rate of the second attribute of the subwavelength pattern in the first cell is greater than a change rate of the second attribute of the subwavelength pattern in the second cell and
- a change rate of the first attribute of the subwavelength pattern in the first cell is greater than a change rate of the first attribute of the subwavelength pattern in the third cell.
Dependencies are inferred from the claim text.