Laser emission system and laser radar

Abstract

The invention relates to the technical field of laser radars, and provides a laser emission system and a laser radar, the laser emission system comprises a back support part and a bottom support part, the back support part and the bottom support part are vertically arranged, the back support part is provided with a driving circuit board, and the bottom support part is provided with a driving circuit board. An edge-emitting laser is arranged on the driving circuit board, an angle adjusting piece is arranged at the light emitting end of the edge-emitting laser, and the angle adjusting piece is used for adjusting the emitting angle of a light beam emitted by the edge-emitting laser. The angle adjusting part is additionally arranged at the light emitting end of the edge-emitting laser, so that the installation position and the installation direction of the driving electric plate can be more flexible, the driving circuit board can make large-area contact with the shell, the heat dissipation effect of the driving circuit board is good, the performance of the edge-emitting laser is improved, and the service life of the edge-emitting laser is prolonged. Therefore, the environmental adaptability of the laser radar is better.

Description

Technical Field

[0001] The present application belongs to the field of laser radar technology, and more specifically, to a laser emission system and a laser radar. Background Art

[0002] LiDAR is a radar system that emits laser beams to detect the position, speed and other characteristic quantities of a target. Its working principle is to emit a detection signal (laser beam) to the target, and then compare the received signal reflected from the target (target echo) with the transmitted signal. After appropriate processing, relevant information about the target can be obtained, such as target distance, direction, height, speed, attitude, and even shape parameters, so as to locate, detect and track vehicles, goods, roads, obstacles, people, aircraft, missiles and other targets.

[0003] Existing LiDARs usually use edge-emitting lasers, such as Figure 1 As shown, the vertical direction of the outgoing beam is the slow axis direction of the edge emitting laser 100, as shown in Figure 2 As shown, the horizontal direction is the fast axis direction of the edge emitting laser 100 . The laser beam emitted by the edge emitting laser 100 passes through the collimating lens group 400 and then enters the hole-digging reflecting mirror 500 .

[0004] With respect to the above-mentioned related technologies, the inventor believes that there are the following defects:

[0005] Since temperature has a great influence on the output power, central wavelength and other properties of the edge emitting laser 100, and the slow axis direction of the edge emitting laser 100 is parallel to the driving circuit board 200, the driving circuit board 200 of the edge emitting laser 100 is not parallel to the back support part and the bottom support part of the housing 300, resulting in the laser driving circuit board being unable to contact the housing 300 over a large area, resulting in poor heat dissipation effect of the driving circuit board 200, affecting the performance of the edge emitting laser 100, and thus the environmental adaptability of the laser radar is also relatively poor. Summary of the invention

[0006] The purpose of the embodiments of the present application is to provide a laser emission system and a laser radar to solve the following technical problems:

[0007] The slow axis direction of the edge-emitting laser is parallel to the driver circuit board. Therefore, the driver circuit board of the edge-emitting laser is not parallel to the back support part and the bottom support part of the shell, resulting in the laser driver circuit board being unable to contact the shell with a large area, making the heat dissipation effect of the driver circuit board poor, affecting the performance of the edge-emitting laser, and thus the environmental adaptability of the laser radar is also relatively poor.

[0008] To achieve the above objectives, in the first aspect, the technical solution adopted in this application is:

[0009] A laser emitting system is provided, comprising a back support portion and a bottom support portion, wherein the back support portion and the bottom support portion are arranged perpendicular to each other, a driving circuit board is mounted on the back support portion, an edge emitting laser is arranged on the driving circuit board, and an angle adjustment member is arranged at the light emitting end of the edge emitting laser, wherein the angle adjustment member is used to adjust the emission angle of the light beam emitted by the edge emitting laser.

[0010] In an achievable technical solution of the present application, the angle adjustment member is a right-angle prism, a right-angle surface of the right-angle prism is fitted and mounted on the end face of the light-emitting end of the edge-emitting laser, the angle between the inclined surface of the right-angle prism and the driving circuit board is an acute angle, and the angle adjustment member is used to rotate the light beam emission angle of the edge-emitting laser by 90 degrees.

[0011] In an achievable technical solution of the present application, the angle adjustment member is a micro-reflector, the micro-reflector is installed at an acute angle to the emission direction of the light beam, and the angle adjustment member is used to rotate the emission angle of the light beam of the edge-emitting laser by 90 degrees.

[0012] In an achievable technical solution of the present application, the angle adjustment member is installed separately from the edge-emitting laser, and the angle adjustment member is detachably installed on the light-emitting end of the edge-emitting laser or on the driving circuit board.

[0013] The above technical solution makes it convenient to replace parts individually at a later stage.

[0014] In a feasible technical solution of the present application, the angle adjustment member is installed integrally with the edge emitting laser, and the angle adjustment member is integrated on the housing of the edge emitting laser.

[0015] In an achievable technical solution of the present application, the edge emitting laser is located at one end of the driving circuit board away from the bottom support portion, and the edge emitting laser is located on a side of the driving circuit board away from the back support portion.

[0016] In an achievable technical solution of the present application, a thermal conductive coating is provided between the driving circuit board and the back support portion.

[0017] Through the above technical solution, the heat dissipation effect can be effectively improved.

[0018] In an achievable technical solution of the present application, a gap is provided between the driving circuit board and the bottom supporting portion.

[0019] Through the above technical solution, the driver circuit board and the bottom support part can be effectively prevented from contacting each other, and the driver circuit board can be effectively prevented from being disturbed during operation. The size of the gap can be determined according to actual installation needs, but is generally greater than 10 cm.

[0020] In an achievable technical solution of the present application, it also includes: a collimating lens group and a hole-punching reflector, wherein the angle adjustment member, the collimating lens group and the hole-punching reflector are arranged at intervals, and the light beam emitted by the edge-emitting laser passes through the angle adjustment member, the collimating lens group and the hole-punching reflector in sequence.

[0021] To achieve the above objectives, in the second aspect, the technical solution adopted in this application is:

[0022] A laser radar is provided, comprising the above-mentioned laser emission system.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] By adding an angle adjustment part to the light-emitting end of the edge-emitting laser, the installation position and direction of the driving electric board can be more flexible, so that the driving circuit board can be in contact with the shell over a large area, so that the heat dissipation effect of the driving circuit board is good, the performance of the edge-emitting laser is improved, and the environmental adaptability of the laser radar is better;

[0025] In a further design, a thermal conductive coating is provided between the driver circuit board and the back support portion, thereby achieving a better heat dissipation effect;

[0026] In a further design scheme, the angle adjustment member is installed separately from the edge emitting laser to facilitate the subsequent replacement of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0028] Figure 1 It is a schematic diagram of the principle of the emitting laser in the slow axis direction in the prior art.

[0029] Figure 2 It is a schematic diagram of the principle of the emitting laser in the fast axis direction in the prior art.

[0030] Figure 3 It is a schematic diagram of the installation structure of the driving circuit board, the edge-emitting laser and the angle adjustment member in the embodiment of the present application.

[0031] Figure 4 A schematic diagram of the top view of the laser emission system provided in an embodiment of the present application.

[0032] Figure 5 A side view structural schematic diagram of the laser emission system provided in an embodiment of the present application.

[0033] Among them, the reference numerals in the figure are:

[0034] 100. Edge emitting laser;

[0035] 200, driving circuit board;

[0036] 300, laser radar housing; 31, back support portion; 32, bottom support portion;

[0037] 400, collimating lens assembly;

[0038] 500, hole-digging reflector;

[0039] 600. Angle adjustment member. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0042] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] At present, lidar systems are widely used in the field of intelligent driving, playing an important role in distance measurement, target recognition and road monitoring.

[0045] In the field of intelligent driving, the lidar system can perceive the driving environment. Its working principle is to emit collimated detection light into the surrounding environment through a laser transmitter, and receive the reflected light formed by the detection light encountering the measured object in the surrounding environment through a laser receiver, and then use the time-of-flight method to calculate the position, size and other information of objects in the surrounding environment.

[0046] LiDAR is a radar system that emits laser beams to detect the position, speed and other characteristic quantities of a target. Its working principle is to emit a detection signal (laser beam) to the target, and then compare the received signal reflected from the target (target echo) with the transmitted signal. After appropriate processing, relevant information about the target can be obtained, such as target distance, direction, height, speed, attitude, and even shape parameters, so as to locate, detect and track vehicles, goods, roads, obstacles, people, aircraft, missiles and other targets.

[0047] LiDAR has many advantages such as high accuracy, fast operation speed and high efficiency. It is an indispensable core sensor in the fields of autonomous driving, robot positioning and navigation, space environment mapping, security and prevention, etc.

[0048] In order to effectively solve the following objective technical problems of laser radar in the prior art: "Since temperature has a great influence on the output power, central wavelength and other performances of the edge emitting laser, and the slow axis direction of the edge emitting laser is parallel to the driver circuit board, the driver circuit board of the edge emitting laser is not parallel to the back support part and the bottom support part of the shell, resulting in the laser driver circuit board being unable to contact the shell with a large area, resulting in poor heat dissipation effect of the driver circuit board, affecting the performance of the edge emitting laser, and thus the environmental adaptability of the laser radar is also relatively poor", the technical solution of the present application is specially provided.

[0049] Please also read Figure 3-Figure 5 , the edge-emitting laser emission system and laser radar provided in the embodiments of the present application are now described.

[0050] The present application embodiment provides a laser emission system. Figure 3 , Figure 4 and Figure 5 , including a back support portion 31 and a bottom support portion 32, and the back support portion 31 and the bottom support portion 32 are arranged perpendicular to each other.

[0051] A driving circuit board 200 is mounted on the back support portion 31 , and an edge emitting laser 100 is disposed on the driving circuit board 200 . An angle adjusting member 600 is disposed at the light emitting end of the edge emitting laser 100 . The angle adjusting member 600 is used to adjust the emission angle of the light beam emitted by the edge emitting laser 100 .

[0052] The back support portion 31 and the bottom support portion 32 are part of the laser radar housing 300 and form a simple L shape. The back support portion 31 and the bottom support portion 32 are both made of plastic and are integrally formed.

[0053] The laser emission system also includes: a collimating lens group 400 and a hole-digging reflecting mirror 500.

[0054] The angle adjustment member 600 , the collimating lens group 400 and the hole-digging reflecting mirror 500 are arranged at intervals, and the light beam emitted by the edge emitting laser 100 passes through the angle adjustment member 600 , the collimating lens group 400 and the hole-digging reflecting mirror 500 in sequence.

[0055] The reflective surface of the hole reflector 500 can be a coated mirror reflector, which can make the hole reflector 500 produce mirror reflection. The mirror reflector described here is a polished optical lens, and its surface roughness can be expressed by surface finish with high precision. Therefore, this optical lens can be regarded as a mirror surface, and the reflection it produces can be regarded as a complete mirror reflection, without intending to define the mirror reflector as an idealized mirror reflection.

[0056] In addition, the reflective surface of the hole-punched reflector 500 may also be a reflector with a relatively rough surface, and the rough reflector can cause the reflected laser to produce diffuse reflection.

[0057] Compared with the prior art, the laser emission system provided by this application has the following expected technical effects:

[0058] By adding an angle adjustment member 600 to the light-emitting end of the edge-emitting laser 100, the installation position and direction of the driving electric board can be more flexible, so that the driving circuit board 200 can be in contact with a large area of ​​the outer shell, so that the heat dissipation effect of the driving circuit board 200 is good, the performance of the edge-emitting laser 100 is improved, and the environmental adaptability of the laser radar is better.

[0059] In this embodiment, the angle adjustment member 600 is a right-angle prism, a right-angle surface of which is fitted onto the end face of the light-emitting end of the edge-emitting laser 100, and the angle between the inclined surface of the right-angle prism and the driving circuit board 200 is an acute angle. The angle adjustment member 600 is used to rotate the light beam emission angle of the edge-emitting laser 100 by 90 degrees.

[0060] In other embodiments, the angle adjustment member 600 may also be a micro-reflector, which is installed at an acute angle (specifically, preferably 45 degrees) to the emission direction of the light beam. The angle adjustment member 600 is used to rotate the light beam emission angle of the edge-emitting laser 100 by 90 degrees.

[0061] Specifically, in order to facilitate the subsequent replacement of parts, the angle adjustment member 600 is installed separately from the edge emitting laser 100, and the angle adjustment member 600 can be detachably installed on the light emitting end of the edge emitting laser 100 or the driving circuit board 200.

[0062] It is also understandable that in order to facilitate quick assembly of the product during manufacturing, the angle adjustment member 600 is installed integrally with the edge emitting laser 100 , that is, the angle adjustment member 600 is integrated into the housing of the edge emitting laser 100 .

[0063] In this embodiment, in order to facilitate the installation and fixation of the driving circuit board 200, the edge emitting laser 100 is located at one end of the driving circuit board 200 away from the bottom support portion 32, and the edge emitting laser 100 is located on the side of the driving circuit board 200 away from the back support portion 31.

[0064] In order to further improve the heat dissipation effect, a thermal conductive coating is provided between the driving circuit board 200 and the back support portion 31. The thermal conductive coating can be formed by spraying glue with good thermal conductivity, or it can be replaced by an aluminum alloy fixing plate, which also has good thermal conductivity, or the thermal conductive material structure can also be made of copper.

[0065] In order to prevent the driving circuit board 200 and the bottom supporting portion 32 from contacting each other and effectively prevent the driving circuit board 200 from being disturbed during operation, a gap is provided between the driving circuit board 200 and the bottom supporting portion 32 .

[0066] The size of the gap can be determined according to actual installation requirements, but is generally greater than 10 cm, for example, 12 cm or 15 cm.

[0067] Embodiment 1 of the present application further provides a laser radar, including:

[0068] case;

[0069] As well as the above-mentioned laser emitting system, the laser emitting system is installed in a shell. Since the shell is a conventional design structure in the prior art, the shell is not identified in the drawings of this embodiment.

[0070] On the basis of the above advantages of the edge-emitting laser emission system, the laser radar also has the above advantages, namely:

[0071] By adding an angle adjustment member 600 to the light-emitting end of the edge-emitting laser 100, the installation position and direction of the driving electric board can be more flexible, so that the driving circuit board 200 can be in contact with a large area of ​​the outer shell, so that the heat dissipation effect of the driving circuit board 200 is good, the performance of the edge-emitting laser 100 is improved, and the environmental adaptability of the laser radar is better.

[0072] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A laser emission system, characterized in that: The invention comprises a back support portion (31) and a bottom support portion (32), wherein the back support portion (31) and the bottom support portion (32) are arranged perpendicular to each other, a driving circuit board (200) is mounted on the back support portion (31), an edge emitting laser (100) is arranged on the driving circuit board (200), and an angle adjustment member (600) is arranged at the light emitting end of the edge emitting laser (100), and the angle adjustment member (600) is used to adjust the emission angle of the light beam emitted by the edge emitting laser (100).

2. The laser emitting system according to claim 1, characterized in that: The angle adjustment member (600) is a right-angle prism, a right-angled surface of the right-angle prism is fitted on the end surface of the light-emitting end of the edge-emitting laser (100), the angle between the inclined surface of the right-angle prism and the driving circuit board (200) is an acute angle, and the angle adjustment member (600) is used to rotate the light beam emission angle of the edge-emitting laser (100) by 90 degrees.

3. The laser emitting system according to claim 1, characterized in that: The angle adjustment member (600) is a micro-reflector, which is installed at an acute angle to the emission direction of the light beam. The angle adjustment member (600) is used to rotate the emission angle of the light beam of the edge-emitting laser (100) by 90 degrees.

4. The laser emitting system according to claim 1, characterized in that: The angle adjustment member (600) is installed separately from the edge-emitting laser (100), and the angle adjustment member (600) can be detachably installed on the light-emitting end of the edge-emitting laser (100) or on the driving circuit board (200).

5. The laser emitting system according to claim 1, characterized in that: The angle adjustment member (600) is integrally mounted with the edge-emitting laser (100), and the angle adjustment member (600) is integrated on a housing of the edge-emitting laser (100).

6. The laser emitting system according to claim 1, characterized in that: The edge emitting laser (100) is located at one end of the driving circuit board (200) away from the bottom support portion (32), and the edge emitting laser (100) is located at a side of the driving circuit board (200) away from the back support portion (31).

7. The laser emitting system according to claim 6, characterized in that: A heat-conducting coating is provided between the driving circuit board (200) and the back support portion (31).

8. The laser emitting system according to claim 6, characterized in that: A gap is provided between the driving circuit board (200) and the bottom supporting portion (32).

9. The laser emitting system according to claim 1, characterized in that: Also includes: A collimator lens group (400) and a hole-punching reflector (500), the angle adjustment member (600), the collimator lens group (400) and the hole-punching reflector (500) are arranged at intervals, and a light beam emitted by the edge-emitting laser (100) passes through the angle adjustment member (600), the collimator lens group (400) and the hole-punching reflector (500) in sequence.

10. A laser radar, characterized in that: Comprising a laser emission system as described in any one of claims 1 to 9.

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