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Lidar device

  • US 10,557,924 B1
  • Filed: 03/22/2019
  • Issued: 02/11/2020
  • Est. Priority Date: 05/14/2018
  • Status: Active Grant
First Claim
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1. A lidar device for measuring a first 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 beam steering cell among the plurality of the beam steering cells includes;

    an increment of a first attribute being repeated along a first direction from a center of the metasurface to a row of the specific beam steering cell and a first change rate of the first attribute being increased according to a second distance from the row of the specific beam steering cell to the center of the metasurface, an increment of a second attribute being repeated along a second direction from the center of the metasurface to a column of the specific beam steering cell and a second change rate of the second attribute being related to a third distance from the column of the specific beam steering cell to the center of the metasurface, andwherein the first attribute is related to at least one of a first width, a first height, and a first number per unit length of the nanopillars, and the second attribute is related to at least one of a second width, a second height, and a second number per unit length of the nanopillars.

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