Pulsed light irradiation/receiving device, and optical radar device

A light-receiving device and pulsed light technology, applied in the direction of measurement device, use of re-radiation, and re-radiation of electromagnetic waves, can solve the problems of insufficient, weakened signal strength, and reduced distance measurement accuracy, and achieve the goal of preventing blind spots and improving light intensity. Effect

Pending Publication Date: 2019-04-30
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combined irradiation type is easy to miniaturize because it does not require a mechanical mechanism, but since the laser intensity on the object is weaker than that of the scanning type, if the distance to the object increases, the signal strength will weaken and the distance measurement accuracy will decrease
In the case of shaping the laser beam into a line and scanning in only one direction (see Patent Documents 3 and 4), compared with combined irradiation, the irradiation intensity is improved but not sufficient.

Method used

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  • Pulsed light irradiation/receiving device, and optical radar device
  • Pulsed light irradiation/receiving device, and optical radar device
  • Pulsed light irradiation/receiving device, and optical radar device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach 〕

[0042] (LiDAR device)

[0043] based on Figure 1 to Figure 2 , the structure of the lidar device 100 according to the first embodiment of the present invention will be described. The lidar device 100 includes a pulse light emitting / receiving unit 10 , a control / power supply unit 20 , a housing 30 , and a drive / interface unit 40 . The lidar device 100 irradiates the pulsed light 1 toward the object 3 , receives reflected light from the object 3 , and measures the transit time ToF.

[0044] The pulsed light emitting / receiving unit 10 irradiates the object 3 with the pulsed light 1 and receives the reflected light 2 from the object 3 .

[0045] The control / power supply unit 20 supplies power to the pulsed light emitting / receiving unit 10, and controls the timing of the pulsed light irradiation and light reception.

[0046]The housing 30 holds the pulsed light emitting / receiving unit 10 and the control / power supply unit 20 .

[0047] The drive / interface unit 40 supplies power...

no. 2 approach 〕

[0093] image 3 The lidar device 100a of the second embodiment is shown. The lidar device 100 a is different from the lidar device 100 in that it is not a rotating mechanism and scans a measurement area using a mirror. The pulsed light emitting / receiving unit 10 a has the same function as the pulsed light emitting / receiving unit 10 . Since there is no need to rotate the frame body 30a, it is easy to realize downsizing, weight reduction, and low power consumption. In addition, mirrors are advantageous in that two-dimensional scanning is possible.

[0094] The lidar device 100a includes a pulse light emitting / receiving unit 10a, a control / power supply unit 20a, a mirror 35, a mirror driving unit 36, and a housing 30a.

[0095] The pulsed light emitting / receiving unit 10 a irradiates the object 3 with the pulsed light 1 and receives the reflected light 2 from the object 3 .

[0096] The control / power supply unit 20a supplies power to the pulse light emitting / light receiving u...

no. 3 approach 〕

[0106] Figure 4 The lidar device 100b of the third embodiment is shown. The lidar device 100 b is different from the lidar device 100 in that it is not a rotating mechanism and scans a measurement area using a polygon mirror. The pulsed light emitting / receiving unit 10 b has the same function as the pulsed light emitting / receiving unit 10 . Since there is no need to rotate the frame body 30b, it is easy to realize size reduction, weight reduction, and low power consumption. The polygon mirror is advantageous in that two-dimensional scanning is possible.

[0107] The lidar device 100b includes a pulsed light emitting / receiving unit 10b, a control / power supply unit 20b, a polygon mirror 35b, a mirror driving unit 36b, and a housing 30b.

[0108] The pulsed light emitting / receiving unit 10 b irradiates the object 3 with the pulsed light 1 and receives the reflected light 2 from the object 3 .

[0109] The control / power supply unit 20b supplies power to the pulse light emitti...

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Abstract

The present invention can prevent the occurrence of blind spots, and can improve the intensity of light irradiated onto an object with a small number of optical members regardless of the distance to the object. A pulsed light emitting element 70 emits pulsed light that is linearly polarized in a first polarization direction, the pulsed light 1 passes through a polarizing beam splitter 60 and a lens 50 in this order and is radiated onto a target object 3, reflected light 2 passes through the lens 50 and the polarizing beam splitter 60 in this order, is linearly polarized in a second polarization direction that is different from the first polarization direction, and is concentrated on a light receiving element 80, the pulsed light emitting element 70 and the light receiving element 80 are provided on a focal plane of the lens 50, and the optical axis of the pulsed light 1 and the optical axis of the reflected light 2 overlap.

Description

technical field [0001] The present invention relates to a laser radar device and a pulsed light irradiation and light receiving device mounted on the laser radar device. In particular, the present invention relates to a lidar device for acquiring a three-dimensional image mainly composed of a two-dimensional image of an object and distance information to the object, and a pulsed light irradiation and receiving device mounted on the lidar device. Background technique [0002] A 3D picture is a concept that includes distance information to an object in the field of view in addition to a 2D picture such as a normal photo. In recent years, it has been developed as an application for peripheral recognition of automobiles and robots. As a method of measuring high-precision distance information, a method of irradiating laser light and measuring the time of flight (Time-of-flight: ToF) of the laser light after being reflected from an object and returning is widely used. [0003] As...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/02G01S7/481G01S17/89G01S17/93
CPCG01S7/481G01S17/02G01S7/483G01S7/499G01S7/4817G01S17/08G01S17/93G01S7/4811G01S17/89G01S7/4818
Inventor 井口胜次藤井宪晃河西秀典高桥幸司
Owner SHARP KK
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