Laser radar device

Patent metadata

Field	Value
Publication number	US-11940564-B2
Application number	US-202117236359-A
Country	US
Kind code	B2
Filing date	Apr 21, 2021
Priority date	Dec 6, 2018
Publication date	Mar 26, 2024
Grant date	Mar 26, 2024

Abstract

A laser radar device includes: a light source for outputting laser light; a scanner for causing the laser light to scan; a first optical system for receiving the laser light caused to scan by the scanner and incident on the first optical system and emitting the incident laser light in such a manner that a horizontal component of the incident laser light is different from a horizontal component of the laser light to be emitted; and a second optical system for receiving the laser light caused to scan by the scanner and incident on the second optical system and emitting the incident laser light in such a manner that an incident area of the incident laser light in the horizontal direction is the same as an incident area of the first optical system in the horizontal direction, and an emission area of the incident laser light is different from an emission area of the first optical system.

First claim

The invention claimed is:

1. A laser radar device comprising:
a light source to output laser light;
a scanner to cause the laser light to scan;
a first optical system to receive the laser light caused to scan by the scanner and incident on the first optical system, and emit the incident laser light in such a manner that a horizontal component of the incident laser light is different from a horizontal component of the laser light to be emitted; and
a second optical system to receive the laser light caused to scan by the scanner and incident on the second optical system, and emit the incident laser light in such a manner that an incident area of the incident laser light in the horizontal direction is the same as an incident area of the first optical system in the horizontal direction, and an emission area of the incident laser light is different from an emission area of the first optical system, wherein
the first optical system emits the incident laser light in such a manner that a positive/negative sign of a vertical component of the incident laser light is different from a positive/negative sign of a vertical component of the laser light to be emitted, and
the second optical system emits the incident laser light in such a manner that an incident area of the second optical system in the vertical direction and an incident area of the first optical system in the vertical direction are symmetric with respect to an optical axis, and a positive/negative sign of a vertical component of the incident laser light is different from a positive/negative sign of a vertical component of the laser light to be emitted.

2. The laser radar device according to claim 1 , wherein the first optical system reflects the incident laser light and emits the reflected laser light, and the second optical system reflects the incident laser light and emits the reflected laser light.

3. The laser radar device according to claim 1 , wherein a horizontal component of a normal vector of an incident surface of the first optical system is different from a horizontal component of a normal vector of an incident surface of the second optical system, and a horizontal component of a normal vector of an emission surface of the first optical system is the same as a horizontal component of a normal vector of an emission surface of the second optical system.

4. The laser radar device according to claim 1 , wherein a horizontal component of a normal vector of an incident surface of the first optical system is the same as a horizontal component of a normal vector of an incident surface of the second optical system, and a horizontal component of a normal vector of an emission surface of the first optical system is different from a horizontal component of a normal vector of an emission surface of the second optical system.

5. The laser radar device according to claim 1 , further comprising a transmission optical system for vertically spreading the laser light output from the light source and outputting the vertically spread laser light to the scanner.

Assignees

• Mitsubishi Electric Corp

Inventors

• Ito Yusuke
• Yanagisawa Takayuki
• Aruga Hiroshi
• Imaki Masaharu
• Yoshiki Wataru
• Kameyama Shumpei

Classifications

• G01S7/4817 Primary

  relating to scanning · CPC title

• G02B26/101

  with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129) · CPC title

• G01S7/4812 Primary

  transmitted and received beams following a coaxial path · CPC title

• G01S17/89

  for mapping or imaging · CPC title