Non-uniform light-emitting lidar apparatus and autonomous robot including the same
Provided are non-uniform light-emitting lidar (light detection and ranging) apparatuses and autonomous robots including the same. A lidar apparatus may include a light source configured to emit light, an optical unit arranged on an optical path of light emitted from the light source and configured to change an optical profile of the light to be non-uniform, and a 3D sensor configured to sense location of an object by receiving reflection light from the object.
1. A lidar apparatus comprising:
a light source configured to emit light;
an optical unit arranged on an optical path of light emitted from the light source and configured to change an optical profile of the light to be non-uniform; and
a 3D sensor configured to sense a location of an object by receiving reflection light from the object,
wherein the optical unit comprises:
a diffuser configured to be arranged on the optical path of light emitted from the light source and to diffuse light to have a uniform intensity; and
a lens or a grating device arranged on an optical path of diffusing light diffused from the diffuser and configured to change the optical profile of the diffusing light so that the diffusing light has a non-uniform intensity,
wherein the lens or the grating device changes the optical profile of the diffusing light to prevent the 3D sensor from over saturating by reflection light reflected by a first object located near the lens or the grating device, and
wherein the lens or grating device tilts a first portion of the diffusing light reaching the first object at a first distance from the lidar apparatus so that an intensity of the first portion of the diffusing light is lower than an intensity of a second portion of the diffusing light reaching a second object at a second distance greater than the first distance.
2. The lidar apparatus of claim 1 , wherein the lens or the grating device tilts the first portion of the diffusing light so that the first portion of the diffusing light proceeds towards the second object.
3. The lidar apparatus of claim 1 , wherein the lens comprises at least one of a cylinder lens, a micro lens array, and a Fresnel lens.
4. The lidar apparatus of claim 3 , wherein the cylinder lens comprises a biconvex lens.
5. The lidar apparatus of claim 1 , wherein the lens or the grating device is arranged to contact the diffuser.
6. The lidar apparatus of claim 1 , wherein the light source is arranged on an upper side of the 3D sensor based on a ground surface.
7. The lidar apparatus of claim 1 , wherein the light source is arranged on a lower side of the 3D sensor based on a ground surface.
8. The lidar apparatus of claim 1 , wherein the light source and the 3D sensor are horizontally arranged based on a ground surface.
9. The lidar apparatus of claim 1 , wherein the light source comprises a laser diode or a laser.