CN219456491U - Laser transceiver module and laser radar - Google Patents

Abstract

The application relates to the technical field of laser radars and provides a laser transceiver module and a laser radar, wherein the laser transceiver module comprises a shell, a laser emission unit and a beam splitter, the laser emission unit and the beam splitter are respectively positioned on two opposite sides of the shell, a first optical channel and an extinction chamber are arranged in the shell, the first optical channel is connected with the laser emission unit and the beam splitter, the extinction chamber is positioned on the side of the first optical channel, two ends of the extinction chamber are respectively a closed end and an open end, the open end is arranged close to the beam splitter and communicated with the first optical channel, the closed end is arranged close to the laser emission unit, an opening is formed in one side of the extinction chamber away from the first optical channel, and the opening is sealed by part of a base for the laser transceiver module to install; the laser radar comprises the laser transceiver module. The laser transceiver module and the laser radar have good effect of eliminating stray light, and are favorable for improving the detection capability of the laser radar.

Description

Laser transceiver module and laser radar

Technical Field

The application belongs to the technical field of laser radars, and particularly relates to a laser transceiver module and a laser radar.

Background

With the recent maturity of laser radar technology, laser radar is deployed along a road to realize vehicle-road coordination and intelligent networking, which is a great trend. The laser radar has the greatest advantages that three-dimensional position information can be generated, the position, the size, the external form and the like of an object can be rapidly determined, and meanwhile, data can be obtained and a high-precision digital map can be generated.

Compared with sensors such as cameras, the laser radar has the advantages of longer detection distance, higher measurement accuracy, more sensitive response speed and no influence of ambient light, so that the laser radar has more and more application scenes and wider application range.

Stray light is light projected onto the image plane by the optical system that does not participate in imaging. The stray light is formed by the non-imaging light rays which are emitted to the inner wall surface of the instrument lens barrel through the optical system and then emitted to the image plane through the exit pupil of the optical system after being reflected by the inner wall surface. And when the imaging light beam and the non-imaging light beam pass through the refraction surface of the optical part, part of 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. Further, stray light is also caused by scratches, pits, insufficiently polished portions on the surface of the optical component, and by stripes and impurities inside the optical material, scattering of rough non-working surfaces of the optical component, and the like.

For example, chinese patent application No. 202080004045.X discloses a laser transceiver module and laser radar comprising: the device comprises a shell, a transmitting module, a beam splitting module and a receiving module, wherein the transmitting module, the beam splitting module and the receiving module are fixed in the shell, an emergent light signal sent by the transmitting module is emergent outwards after passing through the beam splitting module and returns to a reflected light signal after being reflected by a target object in a detection area, the reflected light signal is received and deflected by the beam splitting module and then is received by the receiving module, an extinction structure is arranged between the transmitting module and the beam splitting module and is used for preventing the emergent light signal reflected by the beam splitting module from being emitted to the receiving module, the extinction structure is arranged on the shell and comprises a first reflecting surface and a second reflecting surface which are arranged in an angle way; one end of the first reflecting surface is close to the transmitting module, and the other end of the first reflecting surface is connected with the second reflecting surface; one end of the second reflecting surface is connected with the first reflecting surface, the other end of the second reflecting surface is close to the beam splitting module, the transmitting module comprises a laser and a collimating module, the laser is used for generating laser signals, the collimating module is used for collimating the laser signals and comprises a fast axis collimating lens group and a slow axis collimating lens group, a first transmitting diaphragm is arranged on the front side of the emergent end of the collimating module, and a second transmitting diaphragm is arranged between the fast axis collimating lens group and the slow axis collimating lens group.

With respect to the related art in the above, the inventors consider that there are the following drawbacks:

the triangular concave structure formed by the first reflecting surface and the second reflecting surface of the extinction structure has the advantages that the reflection times and the space of stray light in the extinction structure are limited, the elimination effect on the stray light is poor, the detection capability of the laser radar is affected, and therefore the improvement is needed.

Disclosure of Invention

An object of the embodiment of the application is to provide a laser transceiver module and laser radar to solve the technical problem that the laser transceiver module has poor detection capability because of poor effect of eliminating stray light.

In order to achieve the above object, according to a first aspect, the present application adopts the following technical scheme:

the utility model provides a laser transceiver module, including shell, laser emission unit and beam splitter, the laser emission unit with the beam splitter is located respectively the relative both sides of shell, be provided with first light passageway and extinction cavity in the shell, first light passageway is connected the laser emission unit with the beam splitter, extinction cavity is located the side of first light passageway, just the both ends of extinction cavity are blind end and open end respectively, the open end is close to the beam splitter is arranged, and communicate in first light passageway, the blind end is close to the laser emission unit is arranged, one side that extinction cavity kept away from first light passageway is provided with the opening, the opening is by the confession the part of the base of laser transceiver module installation is sealed.

Through the technical scheme, compared with the conventional technology, the length direction of the extinction chamber is approximately arranged towards one side of the laser emission unit, the extinction chamber is designed to be longer and deeper, so that the reflection times of stray light in the extinction chamber are more, the stray light is further favorably eliminated, the signal interference caused by the stray light is reduced, and the detection capability of the laser radar is favorably improved; the opening can be sealed through the part of the base for the installation of the laser transceiver module, so that the problem of limited structure can be effectively solved, and the difficulty and the cost are reduced for manufacturing the extinction chamber.

In an achievable technical scheme of the present application, the extinction chamber includes an inclined section and a straight line section, the inclined section includes the open end, the straight line section with the first optical channel parallel arrangement, the inclined section with contained angle between the straight line section is the obtuse angle.

Through above-mentioned technical scheme, the extinction cavity of above-mentioned design, simple structure, processing preparation is more convenient.

In an achievable technical scheme of the application, the laser beam splitter further comprises a collimation unit, wherein the collimation unit is installed in the first optical channel, and the collimation unit is located between the beam splitter and the laser emission unit.

Through the technical scheme, the length of the straight line segment can be ensured to be longer, and then the reflection times of stray light in the extinction chamber are more, so that the stray light can be eliminated.

In an achievable technical scheme of the present application, the collimating unit includes a fast axis collimating lens and a slow axis collimating lens, and a first extinction structure for light to pass through is disposed between the fast axis collimating lens and the slow axis collimating lens.

Through the technical scheme, in the process that the laser beam is incident into the slow-axis collimating lens from the fast-axis collimating lens, the laser beam is reflected back and forth between the fast-axis collimating lens and the slow-axis collimating lens to generate stray light, the stray light is reflected for many times in the first extinction structure and absorbed, and finally converted into heat to be dissipated, so that stray light interference signals are reduced.

In an achievable technical scheme of the application, the laser beam splitter further comprises a receiving unit and a reflecting mirror, wherein the receiving unit is arranged on one side, close to the laser emitting unit, of the housing, the reflecting mirror is arranged on one side, close to the beam splitter, of the housing, and a second optical channel which is arranged in parallel and at intervals with the first optical channel is further arranged in the housing, and is connected with the receiving unit and the reflecting mirror.

In one possible embodiment of the present application, a second extinction structure is disposed in the second optical channel adjacent to an end of the receiving unit.

Through the technical scheme, the second extinction structure can enable stray light which is about to reach the receiving unit to be further weakened, and the problem that signals are interfered by the stray light is effectively avoided.

In an achievable technical solution of the present application, the device further comprises a diaphragm, and the diaphragm is mounted on a side of the receiving unit adjacent to the second extinction structure.

Through the technical scheme, the diaphragm can enable stray light which is about to reach the receiving unit to be further weakened, and the problem that signals are interfered by the stray light is effectively avoided.

In an achievable technical scheme of the application, be fixed with on the shell and locate at least one first metalwork around the laser emission unit, the laser emission unit includes transmission circuit drive plate and emission shield, the copper exposure area of transmission circuit drive plate and/or emission shield with first metalwork welded fastening.

Through the technical scheme, compared with a conventional glue fixing mode, the connecting structure is firmer, so that the reliability of the laser transmitting unit is higher, and the robustness of the laser receiving and transmitting module is improved.

In an achievable technical scheme of the application, at least one second metal piece arranged around the receiving unit is fixed on the shell, the receiving unit comprises a receiving circuit driving plate and a receiving shielding cover, and the copper exposure area of the receiving circuit driving plate and/or the receiving shielding cover is welded and fixed with the second metal piece.

Through the technical scheme, compared with a conventional glue fixing mode, the connecting structure is firmer, so that the reliability of the receiving unit is higher, and the robustness of the laser receiving and transmitting module is improved.

In order to achieve the above object, according to a second aspect, the present application adopts the following technical scheme:

a laser radar is provided, which comprises a base and the laser transceiver module.

By the technical scheme, on the basis that the laser transceiver module has the advantages, the laser radar also has the advantages, namely: the extinction chamber is designed longer and deeper, so that the reflection times of stray light in the extinction chamber are more, the stray light is further eliminated, signal interference caused by the stray light is reduced, and the detection capability of the laser radar is improved.

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

the length direction of the extinction chamber is approximately arranged towards one side of the laser emission unit, the extinction chamber is designed to be longer and deeper, so that the reflection times of stray light in the extinction chamber are more, stray light is further eliminated, signal interference caused by the stray light is reduced, and the detection capability of the laser radar is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a laser transceiver module according to an embodiment of the present application.

Fig. 2 is a schematic plan sectional structure of a laser transceiver module according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a lidar according to an embodiment of the present application.

Wherein, each reference sign in the figure:

100. a laser transceiver module;

1. a housing; 11. a extinction chamber; 111. an inclined section; 112. a straight line segment; 12. a second extinction structure; 113. an opening;

2. a laser emitting unit; 21. a transmitting circuit driving board; 22. a launch shield;

3. a beam splitter;

4. a collimation unit; 41. a fast axis collimating lens; 42. a slow axis collimating lens; 43. a first extinction structure;

5. a receiving unit; 51. a receiving circuit driving board; 52. receiving a shield;

6. a reflecting mirror;

7. a diaphragm;

8. a first metal piece;

9. a second metal piece;

200. a base; 21. and (5) sealing plates.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can 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 be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1-3, a laser transceiver module 100 and a laser radar according to an embodiment of the present application will be described.

The embodiment of the application provides a laser transceiver module 100, please refer to fig. 1 and 2, including a housing 1, a laser emission unit 2 and a beam splitter 3, the beam splitter 3 is a hole-digging reflector in this embodiment, or may be a reflector without a hole, the laser emission unit 2 and the beam splitter 3 are respectively located at two opposite sides of the housing 1, a first optical channel and an extinction chamber 11 are provided in the housing 1, the first optical channel is connected with the laser emission unit 2 and the beam splitter 3, the extinction chamber 11 is located at a side of the first optical channel, two ends of the extinction chamber 11 are respectively a closed end and an open end, the open end is close to the beam splitter 3 and is communicated with the first optical channel, the closed end is close to the laser emission unit 2, one side of the extinction chamber 11 away from the first optical channel is provided with an opening 113, the opening 113 is sealed by a part of a base 200 for mounting the laser transceiver module, the part of the base 200 is specifically a sealing plate 21 in this embodiment, and the base 200 is shown in fig. 3.

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

the length direction of the extinction chamber 11 is approximately arranged towards one side of the laser emission unit 2, and the extinction chamber 11 is designed to be longer and deeper, so that the reflection times of stray light in the extinction chamber 11 are more, stray light is further eliminated, signal interference caused by the stray light is reduced, and the detection capability of the laser radar is improved; the opening 11 can be sealed through the part of the base 200 for installing the laser transceiver module, so that the problem of limited structure can be effectively solved, and the difficulty and cost for manufacturing the extinction chamber 11 are reduced.

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 optical channel, an included angle between the inclined section 111 and the straight section 112 is an obtuse angle, and the extinction chamber 11 has a simple structure and is more convenient to process and manufacture.

The laser transceiver module 100 further includes a collimation unit 4, where 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 emission unit 2, so that the length of the straight line segment 112 can be ensured to be longer, and further the number of times of reflection of stray light in the extinction chamber 11 is more, which is further beneficial to eliminating the stray light.

Specifically, the collimating unit 4 includes a fast axis collimating lens 41 and a slow axis collimating lens 42, and a first extinction structure 43 for passing light is disposed between the fast axis collimating lens 41 and the slow axis collimating lens 42, and the first extinction structure 43 is formed by enclosing an inner wall of the housing 1 and two baffles arranged at intervals.

Through the above technical scheme, in the process that the laser beam is incident into the slow axis collimating lens 42 from the fast axis collimating lens 41, the laser beam is reflected back and forth between the two to generate stray light, and the stray light is reflected and absorbed for many times in the first extinction structure 43 and finally converted into heat to be dissipated, so that stray light interference signals are reduced.

The laser transceiver module 100 further includes a receiving unit 5 and a reflecting mirror 6, the receiving unit 5 is mounted on one side of the housing 1 adjacent to the laser emitting unit 2, the reflecting mirror 6 is mounted on one side of the housing 1 adjacent to the beam splitter 3, a second optical channel parallel to the first optical channel and spaced apart is further disposed in the housing 1, and the second optical channel is connected with the receiving unit 5 and the reflecting mirror 6.

Specifically, the end portion, close to the receiving unit 5, in the second optical channel is provided with a second extinction structure 12, the second extinction structure 12 is specifically a threaded hole, the internal threads of the threaded hole reflect stray light for a plurality of times, and the second extinction structure 12 can enable stray light to reach the receiving unit 5, so that the stray light is further weakened, and the problem that signals are interfered by the stray light is effectively avoided.

The laser transceiver module 100 further includes a diaphragm 7, where the diaphragm 7 is installed on a side of the receiving unit 5 adjacent to the second extinction structure 12, and the diaphragm 7 can further weaken stray light about to reach the receiving unit 5, so as to effectively avoid the problem that signals are interfered by the stray light.

The laser beam emitted by the laser emission unit 2 sequentially passes through the fast axis collimating lens 41, the first extinction structure 43 and the slow axis collimating lens 42, then passes through the beam splitter 3, is emitted outwards, is reflected by the target object in the detection area, returns a reflected light signal, is received and deflected by the beam splitter 3, and the reflected light signal reflected by the reflecting mirror 6 sequentially passes through the second extinction structure 12 and the diaphragm 7 and is incident into the receiving unit 5.

Specifically, three first metal pieces 8 arranged in a triangle form and arranged around the laser emission unit 2 are fixed on the shell 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 pieces 8.

Compared with the conventional glue fixing mode, the connecting structure is firmer, so that the reliability of the laser emitting unit 2 is higher, and the robustness of the laser transceiver module 100 is improved.

Specifically, the housing 1 is fixed with three second metal pieces 9 arranged in a triangle around the receiving unit 5, the receiving unit 5 includes a receiving circuit driving board 51 and a receiving shielding case 52, and the copper exposing area of the receiving circuit driving board 51 and/or the receiving shielding case 52 is welded and fixed with the second metal pieces 9.

Compared with the conventional glue fixing mode, the connecting structure is firmer, so that the reliability of the receiving unit 5 is higher, and the robustness of the laser transceiver module 100 is improved.

The shell 1 is provided with the threaded holes, the first metal piece 8 and the second metal piece 9 are copper studs, one section of threads of the copper studs are assembled in the threaded holes, the copper studs are more convenient to weld and fix with the copper exposing area of the receiving circuit driving board 51 and/or the receiving shielding cover 52, the laser transmitting unit 2, the receiving unit 5 and the shell 1 form an integrated structure, the reliability is higher, the heat conduction capacity is better, and the rapid heat dissipation is facilitated; and the first metal piece 8 and the second metal piece 9 can be quickly and firmly assembled on the shell 1, and the installation mode of the screw thread assembly is convenient for rotating, disassembling and replacing the first metal piece 8 and the second metal piece 9.

The embodiment of the application further provides a lidar, please refer to fig. 1 and 3, which includes a base 200 and the laser transceiver module 100 as described above, wherein the laser transceiver module 100 is installed inside the base 200, and a sealing plate 21 for sealing the opening 113 is disposed on the base 200.

By the above technical solution, on the basis that the laser transceiver module 100 has the above advantages, the laser radar also has the above advantages, namely: the extinction chamber 11 is designed longer and deeper, so that the reflection times of stray light in the extinction chamber 11 are more, the stray light is further eliminated, signal interference caused by the stray light is reduced, and the detection capability of the laser radar is improved.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.

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.