Distance detection device

Patent metadata

Field	Value
Publication number	US-12196855-B2
Application number	US-202117216365-A
Country	US
Kind code	B2
Filing date	Mar 29, 2021
Priority date	Sep 30, 2018
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

The present disclosure provides a distance detection device. The distance detection device includes a light source configured to emit pulse light beams sequentially; and a scanning module including a first optical module, a second optical module, and drivers. The first optical module and the second optical module are sequentially positioned on an optical path of the light beams emitted by the light source, the drivers drive the first optical module and the second optical module to move to sequentially project the light beams emitted by the light source to different directions and form a strip-shaped scanning range after being emitted from the scanning module.

First claim

What is claimed is:

1. A distance detection device, comprising:
a light source configured to emit pulse light beams sequentially; and
a scanning module including a first optical module, a second optical module, and drivers, the first optical module and the second optical module being sequentially positioned on an optical path of the light beams emitted by the light source, the drivers being configured to drive the first optical module and the second optical module to move to sequentially project the light beams emitted by the light source to different directions;
wherein:
the first optical module includes a light-transmitting prism, and the second optical module includes a polygon mirror, the polygon mirror having a plurality of reflective surfaces configured to alternately reflect one or more light beams emitted by the light-transmitting prism; or
the first optical module includes at least two light-transmitting prisms sequentially positioned on the optical path, and the second optical module includes a light-transmitting prism.

2. The distance detection device of claim 1 , wherein:
the first optical module is configured to change a fixed light beam to emit to different directions at different times to form a field of view close to a cone and the second optical module is configured to change a direction of the fixed light beam to offset along a line; or,
the first optical module is configured to change the direction of the fixed light beam to offset along a line, and the second optical module is configured to change the fixed light beam to different directions at different times to form a field of view close to a cone.

3. The distance detection device of claim 1 , wherein:
the first optical module includes a light-transmitting prism, and the second optical module includes the polygon mirror; and
the light-transmitting prism and the polygon mirror rotate around a same rotation axis, or about two parallel rotation axes, or two rotation axes with a certain included angle.

4. The distance detection device of claim 1 , wherein:
the first optical module includes at least two light-transmitting prisms, and the at least two light-transmitting prisms include a first light-transmitting prism and a second light-transmitting prism.

5. The distance detection device of claim 4 , wherein:
the first light-transmitting prism and the second light-transmitting prism rotate around the same rotation axis at a same speed and opposite directions.

6. The distance detection device of claim 5 , wherein:
at least at a time in the rotation of the first light-transmitting prism and the second light-transmitting prism, a surface of the first light-transmitting prism away from the second light-transmitting prism and a surface of the second light-transmitting prism away from the first light-transmitting prism are mirror-symmetrical, a symmetry plane between the surface of the first light-transmitting prism away from the second light-transmitting prism and the surface of the second light-transmitting prism away from the first light-transmitting prism is perpendicular to the rotation axis of the first light-transmitting prism and the second light-transmitting prism, and a surface of the first light-transmitting prism close to the second light-transmitting prism and a surface of the second light-transmitting prism close to the first light-transmitting prism are mirror-symmetrical with respect to the symmetry plane.

7. The distance detection device of claim 4 , wherein:
the second optical module includes at least two light-transmitting prisms, and the at least two light-transmitting prisms include a third light-transmitting prism and a fourth light-transmitting prism.

8. The distance detection device of claim 7 , wherein:
the third light-transmitting prism and the fourth light-transmitting prism rotate around a same rotation axis at a same speed and opposite directions.

9. The distance detection device of claim 8 , wherein:
rotation speeds of the third light-transmitting prism and the fourth light-transmitting prism are different from the rotation speeds of the first light-transmitting prism and the fourth light-transmitting prism.

10. The distance detection device of claim 7 , wherein:
the third light-transmitting prism and the fourth light-transmitting prism rotate at different speeds.

11. The distance detection device of claim 5 , wherein:
the second optical module further includes a reflective element.

12. The distance detection device of claim 4 , wherein:
the first light-transmitting prism and the second light-transmitting prism rotate at different speeds.

13. The distance detection device of claim 12 , wherein:
the second optical module further includes a reflective element, and the reflective element includes a reflective mirror or a reflective prism.

14. The distance detection device of claim 13 , wherein:
the rotation speed of one of the first light-transmitting prism and the second light-transmitting prism is equal to the rotations of the reflective element plus a set rotation speed; and the rotation speed of the other is equal to the rotation speed of the reflective element minus the set speed.

15. The distance detection device of claim 1 , wherein:
the second optical module further includes a reflective element.

16. The distance detection device of claim 15 , wherein:
the reflective element includes a reflective mirror or a reflective prism, the reflective element including a reflective surface for reflecting the light beam, the reflective surface being inclined with respect to the rotation axis of the reflective element and facing the first optical module.

17. The distance detection device of claim 16 , wherein:
a rotation axis of the reflective element is parallel to the rotation axis of the first optical module.

18. The distance detection device of claim 1 , wherein the first optical module includes a light-transmitting prism, and the second optical module includes the polygon mirror, the polygon mirror having the plurality of reflective surfaces configured to alternately reflect the one or more light beams emitted by the light-transmitting prism.

19. The distance detection device of claim 1 , wherein the first optical module includes at least two light-transmitting prisms, and the second optical module includes a light-transmitting prism.

20. The distance detection device of claim 19 , wherein the first optical module includes a first light-transmitting prism and a second light-transmitting prism, the second optical module includes a third light-transmitting prism and a fourth light-transmitting prism, each of the first light transmitting prism and the second light transmitting prism having two flat mirror surfaces opposite to each other, and each of the third light-transmitting prism and the fourth light-transmitting prism having a flat surface and a curved surface opposite to each other.

Assignees

• Sz Dji Technology Co Ltd

Inventors

• Huang Huai
• Zhao Jin
• Hong Xiaoping

Classifications

• G01S7/4865 Primary

  Time delay measurement, e.g. time-of-flight measurement, time of arrival measurement or determining the exact position of a peak (peak detection in noise, signal conditioning G01S7/487) · CPC title

• G01S7/4817

  relating to scanning · CPC title

• G01S17/10

  using transmission of interrupted, pulse-modulated waves (determination of distance by phase measurements G01S17/32) · CPC title

• G01S17/93

  for anti-collision purposes · CPC title

• G01S17/42 Primary

  Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46) · CPC title