# US 2021/0239805 A1 · Laser radar device

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- Number: US 2021/0239805 A1
- Document ID: US20210239805A1
- Status: Published application
- Kind: A1
- Application number: 17/236,359
- Filed: 2021-04-21
- Published: 2021-08-05
- Earliest claimed: 2018-12-06
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Yusuke ITO; Takayuki YANAGISAWA; Hiroshi ARUGA; Masaharu IMAKI; Wataru YOSHIKI; Shumpei KAMEYAMA
- Web page: https://patentgrep.com/patent/US20210239805A1

## CPC

- G01S 7/4812: {transmitted and received beams following a coaxial path}
- G01S 7/4817: {relating to scanning}
- G01S 17/89: for mapping or imaging
- G02B 26/101: {with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129)}
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.