Multiple simultaneous laser beam emission and illumination while ensuring eye safety

Patent metadata

Field	Value
Publication number	US-12282118-B2
Application number	US-202318340386-A
Country	US
Kind code	B2
Filing date	Jun 23, 2023
Priority date	Aug 24, 2020
Publication date	Apr 22, 2025
Grant date	Apr 22, 2025

Abstract

A LIDAR system is disclosed. The system may include a laser light projection system that may simultaneously provide at least two laser light beams. The system may also include an optical system, including one or more deflectors to project the at least two laser light beams toward a field of view of the LIDAR system. Each of the laser light beams may have an energy density below an eye safe level. However, a total combined energy density of the laser light beams may exceed an eye safe level. The laser light beams may be projected from the deflector are spaced apart from one another by an angular spacing ranging from 2.5 mrad to 6 mrad.

First claim

What is claimed is:

1. A LIDAR system, comprising:
a laser light projection system configured to simultaneously project at least two laser light beams; and
an optical system, including one or more deflectors configured to project the at least two laser light beams toward a field of view of the LIDAR system,
wherein beam divergence causes the at least two laser light beams to at least partially overlap with one another in an overlap zone within the field of view,
wherein each of the at least two laser light beams has an energy density below an eye safe level, but wherein a total combined energy density of the at least two laser light beams is above an eye safe level, and wherein the at least two laser light beams are projected toward the field of view such that chief rays associated with the at least two laser light beams are projected parallel to each other from the optical system toward the field of view and are spaced apart from one another by at least 7 mm.

2. The system of claim 1 , wherein each of the at least two laser light beams is associated with a divergence of at least 0.03 degrees, and the overlap zone begins at about 4 meters from an origin of the at least two laser light beams.

3. The system of claim 1 , wherein within the overlap zone, a total combined energy density of the at least two laser light beams is below an eye safe level and combined light associated with at least a portion of each of the at least two laser light beams is available for object detection.

4. The system of claim 3 , wherein the combined light in the overlap zone is eye safe.

5. The system of claim 1 , wherein the at least two laser light beams are projected toward the field of view such that chief rays associated with the at least two laser light beams are spaced apart from one another by between 7 mm and 20 mm.

6. The system of claim 1 , wherein the at least two laser light beams are projected toward the field of view such that chief rays associated with the at least two laser light beams are spaced apart from one another by between 7 mm and 10 mm.

7. The system of claim 1 , wherein the at least two laser light beams are generated by splitting at least one primary laser beam into two or more sub-beams.

8. The system of claim 7 , wherein the LIDAR system further includes a beam splitter configured to split the at least one primary laser beam into the two or more sub-beams.

9. The system of claim 1 , wherein the at least two laser light beams are provided by a laser array.

10. The system of claim 1 , wherein the at least two laser light beams are provided by discrete lasers.

11. The system of claim 1 , wherein the one or more deflectors include a common deflector configured to receive the at least two laser light beams.

12. The system of claim 1 , wherein each of the at least two laser light beams is incident upon a different deflector of the one or more deflectors.

13. The system of claim 1 , wherein each of the one or more deflectors includes a two-dimensional light deflector.

14. The system of claim 1 , wherein each of the one or more deflectors includes a first one-dimensional light deflector configured to rotate in a first direction and a second one-dimensional light deflector configured to rotate in a second direction different from the first direction.

15. The system of claim 1 , wherein no more than one chief ray associated with the at least two laser light beams can enter a human eye simultaneously.

16. The system of claim 1 , wherein the one or more deflectors are also configured to receive light reflections from the field of view of the LIDAR system.

17. The system of claim 1 , wherein the LIDAR system further includes at least one processor programmed to control positioning of the one or more deflectors to scan the field of view of the LIDAR system with the at least two laser light beams.

Assignees

• Innoviz Tech Ltd

Inventors

• Goren Nir
• Eshel Ronen

Classifications

• G01S7/4817 Primary

  relating to scanning · CPC title

• G01S17/931

  of land vehicles · CPC title

• G01S17/06

  Systems determining position data of a target · CPC title

• G01S7/4911

  Transmitters · CPC title

• G01S7/484

  Transmitters · CPC title