CN219456491U - Laser transceiver module and laser radar - Google Patents

Abstract

The application relates to the technical field of laser radar, and provides a laser transceiver module and a laser radar, wherein the laser transceiver module includes a housing, a laser emitting unit and a beam splitter, and the laser emitting unit and the beam splitter are respectively located on opposite sides of the housing, The housing is provided with a first optical channel and an extinction chamber, the first optical channel is connected to the laser emitting unit and the beam splitter, the extinction chamber is located on the side of the first optical channel, and the two ends of the extinction chamber are closed ends and Open end, the open end is arranged near the beam splitter and communicated with the first optical channel, the closed end is arranged near the laser emitting unit, and an opening is provided on the side of the extinction chamber away from the first optical channel, and the opening is provided by the laser transceiver module Part of the installed base is sealed; wherein the laser radar includes the above-mentioned laser transceiver module. The laser transceiver module and the laser radar of the present application have a good effect on eliminating stray light, which is beneficial to improving the detection capability of the laser radar.

Description

Laser transceiver module and laser radar

technical field

This application belongs to the technical field of laser radar, and more specifically relates to a laser transceiver module and laser radar.

Background technique

In recent years, with the maturity of lidar technology, it has become a general trend to deploy lidar along the roadside to achieve vehicle-road coordination and intelligent network connection. The biggest advantage of lidar is that it can generate three-dimensional position information, quickly determine the position, size, and external shape of objects, and at the same time obtain data and generate high-precision digital maps.

Compared with sensors such as cameras, lidar has a longer detection distance, higher measurement accuracy, and a more sensitive response speed, and is not affected by ambient light. Therefore, lidar has more and more application scenarios and a wider range of applications. wider.

Stray light is harmful light that is projected onto the image plane through the optical system and does not participate in imaging. Stray light is formed by the non-imaging light passing through the optical system to the inner wall surface of the instrument barrel, and then reflected by the inner wall surface and then passing through the exit pupil of the optical system to the image plane. Secondly, when the imaging beam and the non-imaging beam pass through the refraction surface of the optical part, part of the light is reflected back to the inner wall surface of the instrument, or stray light is generated by multiple reflections and refractions between the two refraction surfaces of the optical part. In addition, scratches, pits, and insufficiently polished parts on the surface of optical parts, as well as striations and impurities inside optical materials, and scattering from rough non-working surfaces of optical parts can also cause stray light.

For example, the Chinese patent application number 202080004045.X discloses a laser transceiver module and a laser radar, including: a casing, a transmitting module fixed in the casing, a beam splitting module, and a receiving module. The emitted light signal goes out after passing through the beam splitting module, and returns to the reflected light signal after being reflected by the target object in the detection area. The reflected light signal is received and deflected by the beam splitting module, and then received by the receiving module. There is a light extinction structure between the group and the beam splitting module. The light extinction structure is used to prevent the outgoing light signal reflected by the beam splitting module from being directed to the receiving module, and the light extinction structure is arranged on the housing. The light extinction structure includes angled The first reflective surface and the second reflective surface; one end of the first reflective surface is close to the emission module, and the other end is connected to the second reflective surface; one end of the second reflective surface is connected to the first reflective surface, and the other end is close to the beam splitting module , the emission module includes a laser and a collimation module, the laser is used to generate a laser signal, the collimation module is used to collimate the laser signal, and the collimation module includes a fast-axis collimator mirror group and a slow-axis collimator mirror group, wherein, A first emission aperture is arranged on the front side of the output end of the collimation module, and a second emission aperture is arranged between the fast-axis collimation mirror group and the slow-axis collimation mirror group.

For the related technologies mentioned above, the inventor believes that there are the following defects:

The extinction structure designed above is a triangular concave structure formed by the first reflective surface and the second reflective surface. The number and space of stray light reflected in the extinction structure are limited, and the effect of eliminating stray light is not good, which affects the detection of laser radar. ability, so it needs to be improved.

Utility model content

The purpose of the embodiment of the present application is to provide a laser transceiver module and a laser radar to solve the technical problem that the laser transceiver module has poor detection ability due to poor elimination effect on stray light.

In order to achieve the above object, the first aspect, the technical solution adopted by the application is:

A laser transceiver module is provided, comprising a housing, a laser emitting unit and a beam splitter, the laser emitting unit and the beam splitter are respectively located on opposite sides of the housing, the housing is provided with a first optical channel and An extinction chamber, the first optical channel connects the laser emitting unit and the beam splitter, the extinction chamber is located on the side of the first optical channel, and the two ends of the extinction chamber are respectively A closed end and an open end, the open end is arranged adjacent to the beam splitter and communicated with the first optical channel, the closed end is arranged adjacent to the laser emitting unit, and the extinction chamber is far away from the first One side of the optical channel is provided with an opening, and the opening is sealed by a part of the base for installing the laser transceiver module.

Through the above technical solution, compared with the conventional technology, the length direction of the extinction chamber is generally arranged toward one side of the laser emitting unit, and the extinction chamber is designed to be longer and deeper, so that the number of stray light reflections in the extinction chamber is more More, it is further beneficial to eliminate stray light, reduce the signal interference caused by stray light, and help to improve the detection capability of lidar; the opening can be sealed through the part of the base for the laser transceiver module to be installed, which can effectively solve the problem of structural damage. The problem of limitation reduces the difficulty and cost for the production of the extinction chamber.

In a feasible technical solution of the present application, the extinction chamber includes an inclined section and a straight section, the inclined section includes the open end, and the straight section is arranged in parallel with the first light channel, so The included angle between the inclined section and the straight section is an obtuse angle.

Through the above technical solution, the above-designed extinction chamber has a simple structure and is more convenient to manufacture.

In an achievable technical solution of the present application, a collimation unit is also included, the collimation unit is installed in the first optical channel, and the collimation unit is located between the beam splitter and the laser emitting between units.

Through the above technical solution, it can be ensured that the length of the straight line is relatively long, so that the stray light is reflected more times in the light extinction chamber, which further facilitates the elimination of stray light.

In an achievable technical solution of the present application, the collimation unit includes a fast-axis collimator lens and a slow-axis collimator lens, and a A first light-extinction structure through which light passes.

Through the above technical solution, when the laser beam is incident from the fast-axis collimator lens to the slow-axis collimator lens, stray light will also be generated when the laser beam is reflected back and forth between the two. It is reflected and absorbed multiple times, and finally converted into heat and dissipated, thereby reducing stray light interference signals.

In an achievable technical solution of the present application, a receiving unit and a reflector are also included, the receiving unit is installed on the side of the casing adjacent to the laser emitting unit, and the reflector is installed on the side of the casing adjacent to the laser emitting unit. On one side of the beam splitter, a second optical channel arranged parallel to and spaced from the first optical channel is arranged in the housing, and the second optical channel connects the receiving unit and the reflector.

In a feasible technical solution of the present application, a second light extinction structure is provided at an end of the second optical channel adjacent to the receiving unit.

Through the above technical solution, the second extinction structure can further weaken the stray light that is about to reach the receiving unit, effectively avoiding the problem that the signal is interfered by the stray light.

In a feasible technical solution of the present application, an aperture is further included, and the aperture is installed on a side of the receiving unit adjacent to the second light extinction structure.

Through the above technical solution, the aperture can further weaken the stray light that is about to reach the receiving unit, effectively avoiding the problem that the signal is interfered by the stray light.

In an achievable technical solution of the present application, at least one first metal piece arranged around the laser emitting unit is fixed on the housing, and the laser emitting unit includes an emitting circuit driving board and an emitting shield, The exposed copper area of the transmitting circuit driving board and/or the transmitting shield is welded and fixed to the first metal part.

Through the above technical solution, compared with the conventional glue fixing method, the above connection structure is stronger, so that the reliability of the laser emitting unit is higher, and the robustness of the laser transceiver module is increased.

In a feasible technical solution of the present application, at least one second metal piece arranged around the receiving unit is fixed on the housing, the receiving unit includes a receiving circuit drive board and a receiving shield, the The exposed copper area of the receiving circuit driving board and/or the receiving shield is welded and fixed to the second metal part.

Through the above technical solution, compared with the conventional glue fixing method, the above connection structure is stronger, which makes the receiving unit more reliable and increases the robustness of the laser transceiver module.

In order to achieve the above object, the second aspect, the technical solution adopted by the application is:

Provided is a laser radar, including a base and the above-mentioned laser transceiver module.

Through the above technical solution, on the basis of the above-mentioned advantages of the above-mentioned laser transceiver module, the laser radar also has the above-mentioned advantages, that is, the extinction chamber is designed to be longer and deeper, so that the number of reflections of stray light in the extinction chamber is more More, it is further beneficial to eliminate stray light, reduce the signal interference caused by stray light, and help improve the detection ability of lidar.

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

The length direction of the extinction chamber is roughly arranged towards one side of the laser emitting unit, and the design of the extinction chamber is longer and deeper, so that stray light is reflected more times in the extinction chamber, which is further conducive to eliminating stray light and reducing It eliminates the signal interference caused by stray light, which is conducive to improving the detection ability of lidar.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only for the present application For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

FIG. 1 is a schematic diagram of a three-dimensional structure of a laser transceiver module provided by an embodiment of the present application.

FIG. 2 is a schematic plan view of a cross-sectional structure of a laser transceiver module provided by an embodiment of the present application.

FIG. 3 is a schematic structural diagram of a lidar provided in an embodiment of the present application.

Wherein, each reference sign in the figure:

100. Laser transceiver module;

1. Shell; 11. Extinction chamber; 111. Inclined section; 112. Straight section; 12. Second extinction structure; 113. Opening;

2. Laser emitting unit; 21. Emitting circuit driver board; 22. Emitting shield;

3. Beam splitter;

4. Collimation unit; 41. Fast axis collimating lens; 42. Slow axis collimating lens; 43. First extinction structure;

5. Receiving unit; 51. Receiving circuit driver board; 52. Receiving shield;

6. Mirror;

7. Aperture;

8. The first metal piece;

9. The second metal part;

200, base; 21, sealing plate.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be 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.

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying No device or element must have a particular orientation, be constructed, and operate in a particular orientation, and thus should not be construed as limiting the application.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "plurality" means two or more, unless otherwise specifically defined.

Please refer to FIG. 1-FIG. 3 together. Now, the laser transceiver module 100 and the laser radar provided by the embodiment of the present application will be described.

The embodiment of the present application provides a laser transceiver module 100, please refer to FIG. 1 and FIG. 2, which includes a housing 1, a laser emitting unit 2, and a beam splitter 3. It can be a reflector without holes. The laser emitting unit 2 and the beam splitter 3 are respectively located on opposite sides of the housing 1. The housing 1 is provided with a first optical channel and an extinction chamber 11. The first optical channel is connected to the laser emitting unit. 2 and the beam splitter 3, the extinction chamber 11 is located on the side of the first optical channel, and the two ends of the extinction chamber 11 are closed end and open end respectively, and the open end is arranged adjacent to the beam splitter 3 and communicated with the first The optical channel, the closed end is arranged near the laser emitting unit 2, and the side of the extinction chamber 11 away from the first optical channel is provided with an opening 113, and the opening 113 is sealed by a part of the base 200 for the laser transceiver module to be installed. The base 200 The part is specifically the sealing plate 21 in this embodiment, and the base 200 is shown in FIG. 3 for details.

Compared with the prior art, the laser transceiver module 100 provided by this application has the following expected beneficial technical effects:

The length direction of the extinction chamber 11 is generally arranged towards one side of the laser emitting unit 2, and the extinction chamber 11 is designed to be longer and deeper, so that the number of stray light reflections in the extinction chamber 11 is more, which further facilitates the elimination of stray light. Astigmatism reduces the signal interference caused by stray light, which is conducive to improving the detection capability of the laser radar; the opening 11 can be sealed by a part of the base 200 for the laser transceiver module to be installed, thereby effectively solving the problem of limited structure. Fabrication of the extinction chamber 11 reduces difficulty and cost.

Specifically, the extinction chamber 11 includes an inclined section 111 and a straight section 112, the inclined section 111 includes an open end, the straight section 112 is arranged parallel to the first light channel, and the angle between the inclined section 111 and the straight section 112 is an obtuse angle, the above The designed extinction chamber 11 has a simple structure and is more convenient to manufacture.

The laser transceiver module 100 also includes a collimation unit 4, the collimation unit 4 is installed in the first optical channel, and the collimation unit 4 is located between the beam splitter 3 and the laser emitting unit 2, thereby ensuring that the length of the straight line section 112 is relatively long , and then the stray light is reflected more times in the extinction chamber 11, which is further beneficial to eliminate the stray light.

Specifically, the collimation unit 4 includes a fast-axis collimator lens 41 and a slow-axis collimator lens 42, and a first extinction structure 43 for passing light is arranged between the fast-axis collimator lens 41 and the slow-axis collimator lens 42. A extinction structure 43 is enclosed by the inner wall of the housing 1 and two baffles arranged at intervals.

Through the above-mentioned technical scheme, when the laser beam is incident from the fast-axis collimating lens 41 to the slow-axis collimating lens 42, stray light will also be generated when the laser beam is reflected back and forth between the two. The light extinction structure 43 is reflected and absorbed multiple times, and finally converted into heat and dissipated, thereby reducing stray light interference signals.

The laser transceiver module 100 also includes a receiving unit 5 and a reflector 6. The receiving unit 5 is installed on the side of the housing 1 adjacent to the laser emitting unit 2, and the reflector 6 is installed on the side of the housing 1 adjacent to the beam splitter 3. A second optical channel arranged parallel to and spaced from the first optical channel is provided, and the second optical channel connects the receiving unit 5 and the reflecting mirror 6 .

Specifically, a second light extinction structure 12 is provided near the end of the receiving unit 5 in the second optical channel. The second light extinction structure 12 is specifically a threaded hole. The internal thread of the threaded hole reflects stray light multiple times, and the second light extinction structure 12 The stray light that is about to reach the receiving unit 5 can be further weakened, effectively avoiding the problem that the signal is interfered by the stray light.

The laser transceiver module 100 also includes an aperture 7. The aperture 7 is installed on the side of the receiving unit 5 adjacent to the second extinction structure 12. The aperture 7 can further weaken the stray light that is about to reach the receiving unit 5, effectively preventing the signal from being disturbed. The problem of astigmatism interference.

The laser beam emitted by the laser emitting unit 2 passes through the fast-axis collimating lens 41, the first extinction structure 43, and the slow-axis collimating lens 42 in sequence, and then passes through the beam splitter 3 and then emits outward, and is reflected by the target object in the detection area Afterwards, the reflected light signal is returned. After the reflected light signal is received and deflected by the beam splitter 3 , the reflected light signal reflected by the mirror 6 passes through the second light extinction structure 12 and the diaphragm 7 in turn, and enters the receiving unit 5 .

Specifically, the shell 1 is fixed with three first metal parts 8 arranged in a triangle around the laser emitting unit 2. The laser emitting unit 2 includes an emitting circuit driving board 21 and an emitting shielding cover 22. The emitting circuit driving board 21 The exposed copper area and/or the emission shield 22 are welded and fixed to the first metal part 8 .

Compared with the conventional glue fixing method, the above connection structure is stronger, which makes the laser emitting unit 2 more reliable and increases the robustness of the laser transceiver module 100 .

Specifically, the housing 1 is fixed with three second metal parts 9 arranged in a triangle around the receiving unit 5. The receiving unit 5 includes a receiving circuit driving board 51 and a receiving shield 52. The exposed copper of the receiving circuit driving board 51 is The area and/or receiving shield 52 is welded and fixed to the second metal part 9 .

Compared with the conventional glue fixing method, the above connection structure is stronger, which makes the receiving unit 5 more reliable and increases the robustness of the laser transceiver module 100 .

The casing 1 is provided with threaded holes, the first metal part 8 and the second metal part 9 are copper studs, and a section of the copper studs is threaded in the threaded holes, and the copper studs made of copper are more convenient to connect with the receiving circuit The exposed copper area of the driving board 51 and/or the receiving shield 52 are welded and fixed, so that the laser emitting unit 2, the receiving unit 5 and the housing 1 form an integrated structure, with higher reliability and better thermal conductivity, which is conducive to rapid heat dissipation; Moreover, the first metal part 8 and the second metal part 9 can be quickly and firmly assembled on the housing 1 , and the installation method of screw assembly is also convenient to rotate, disassemble and replace the first metal part 8 and the second metal part 9 .

The embodiment of the present application also provides a laser radar, please refer to FIG. 1 and FIG. 3 , including a base 200 and the above-mentioned laser transceiver module 100, wherein the laser transceiver module 100 is installed inside the base 200, and the base 200 is provided with a sealed opening 113 of the sealing plate 21.

Through the above technical solution, on the basis of the above-mentioned many advantages of the above-mentioned laser transceiver module 100, the laser radar also has the above-mentioned advantages, that is, the extinction chamber 11 is designed to be longer and deeper, so that stray light is reflected in the extinction chamber 11 More times, it is further beneficial to eliminate stray light, reduce the signal interference caused by stray light, and help improve the detection capability of lidar.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the protection of the application. within range.

Claims (10)

1. The utility model provides a laser transceiver module, its characterized in that includes shell (1), laser emission unit (2) and beam splitter (3), laser emission unit (2) with beam splitter (3) are located respectively the opposite sides of shell (1), be provided with first optical path and extinction cavity (11) in shell (1), first optical path connects laser emission unit (2) with beam splitter (3), extinction cavity (11) are located the side of first optical path, just the both ends of extinction cavity (11) are blind end and open end respectively, the open end is close to beam splitter (3) are arranged, and communicate in first optical path, the blind end is close to laser emission unit (2) are arranged, one side that extinction cavity (11) kept away from first optical path is provided with opening (113), opening (113) are sealed by the part of the base that supplies laser transceiver module to install.

2. The laser transceiver module of claim 1, characterized in that the extinction chamber (11) comprises an inclined section (111) and a straight section (112), the inclined section (111) comprising the open end, the straight section (112) being arranged parallel to the first optical channel, an angle between the inclined section (111) and the straight section (112) being an obtuse angle.

3. The laser transceiver module of claim 1, further comprising a collimation unit (4), the collimation unit (4) being mounted in the first optical channel, the collimation unit (4) being located between the beam splitter (3) and the laser emission unit (2).

4. A laser transceiver module as claimed in claim 3, characterized in that the collimating unit (4) comprises a fast axis collimating lens (41) and a slow axis collimating lens (42), a first extinction structure (43) being provided between the fast axis collimating lens (41) and the slow axis collimating lens (42) for the passage of light.

5. The laser transceiver module of claim 1, further comprising a receiving unit (5) and a reflecting mirror (6), wherein the receiving unit (5) is mounted on a side, adjacent to the laser emitting unit (2), of the housing (1), the reflecting mirror (6) is mounted on a side, adjacent to the beam splitting mirror (3), of the housing (1), and a second optical channel, which is arranged in parallel with the first optical channel at intervals, is further arranged in the housing (1), and connects the receiving unit (5) and the reflecting mirror (6).

6. A laser transceiver module as claimed in claim 5, characterized in that the end of the second optical channel adjacent to the receiving unit (5) is provided with a second extinction structure (12).

7. A laser transceiver module as claimed in claim 6, characterized in that it further comprises a diaphragm (7), said diaphragm (7) being mounted to a side of said receiving unit (5) adjacent to said second extinction structure (12).

8. The laser transceiver module according to claim 1, characterized in that at least one first metal piece (8) arranged around the laser emission unit (2) is fixed on the housing (1), the laser emission unit (2) comprises an emission circuit driving board (21) and an emission shielding cover (22), and the copper exposure area of the emission circuit driving board (21) and/or the emission shielding cover (22) are welded and fixed with the first metal piece (8).

9. The laser transceiver module according to claim 5, characterized in that at least one second metal piece (9) arranged around the receiving unit (5) is fixed on the housing (1), the receiving unit (5) comprises a receiving circuit driving board (51) and a receiving shielding cover (52), and the copper exposing area of the receiving circuit driving board (51) and/or the receiving shielding cover (52) are welded and fixed with the second metal piece (9).

10. A lidar comprising a base (200) and a laser transceiver module (100) according to any of claims 1 to 9.