CN212341443U - Laser emission module for laser radar and laser radar - Google Patents

Laser emission module for laser radar and laser radar Download PDF

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Publication number
CN212341443U
CN212341443U CN202022430948.4U CN202022430948U CN212341443U CN 212341443 U CN212341443 U CN 212341443U CN 202022430948 U CN202022430948 U CN 202022430948U CN 212341443 U CN212341443 U CN 212341443U
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laser
light emitting
substrate
lidar
module
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姜波
赵忠尧
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Ruichi Zhiguang Suzhou Technology Co Ltd
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Ruichi Zhiguang Suzhou Technology Co Ltd
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Abstract

The utility model discloses a can be used to laser radar's laser emission module and laser radar. According to the utility model discloses a laser emission module that can be used to laser radar of an embodiment includes: a substrate; a support part disposed on the substrate and formed with a metal line; and a plurality of light emitting parts provided on the support part and capable of emitting laser light, the plurality of light emitting parts being electrically connected to the substrate through the metal wire.

Description

Laser emission module for laser radar and laser radar
Technical Field
The utility model relates to an optics field especially relates to a laser radar and can be used to laser radar's laser emission module.
Background
In the field of autonomous driving, autonomous vehicles may detect surrounding objects by means of a device such as a laser radar (LIDAR). The lidar may obtain related information such as a distance, a speed, and the like about the surrounding object by emitting a laser beam to the surrounding three-dimensional space as a detection signal, and causing the laser beam to be reflected as an echo signal and return after being irradiated to the object in the surrounding space, and comparing the received echo signal with the emitted detection signal.
The laser radar as described above comprises a transmitting module and a receiving module. The emitting module generates and emits laser beams, and the laser beams which are irradiated on surrounding objects and reflected back are received by the receiving module. Since the speed of light is known, the distance of surrounding objects relative to the lidar can be measured by the propagation time of the laser.
With respect to the emission of laser light, the existing laser radar has achieved 32-line or 64-line laser output. In such a multiline lidar, a configuration is adopted in which a plurality of edge-emitting lasers (EELs) are provided in a transmitting module. The laser light of the edge-emitting laser is emitted perpendicularly to the top surface, i.e. the laser light is emitted from the side surface of the edge-emitting laser. Therefore, in the related art, a plurality of edge-emitting lasers are respectively disposed at edges of a plurality of substrates, and then the plurality of substrates are stacked to realize a multi-line lidar.
However, in the above-described configuration, since the multi-line laser radar is implemented by laminating a plurality of substrates, when the number of lines of the laser radar reaches 64 or 128 lines, the size of the transmitting module becomes large, and since the light correction needs to be performed for each substrate on which the edge-emitting laser is provided, a long time is required for correcting all the substrates, which causes a reduction in the production speed of the laser radar and an increase in the manufacturing cost.
Disclosure of Invention
The utility model provides a be favorable to miniaturized laser emission module that can be used to laser radar and have this laser radar.
According to the utility model discloses an embodiment, the laser emission module that can be used to laser radar includes: a substrate; a support part disposed on the substrate and formed with a metal line; and a plurality of light emitting parts provided on the support part and capable of emitting laser light, the plurality of light emitting parts being electrically connected to the substrate through the metal wire.
Also, the light emitting section may be a vertical cavity surface emitting laser.
And, the light emitting part may emit laser light in a direction perpendicular to the substrate, and a top surface of the light emitting part may be flush with a top surface of the supporting part.
The substrate may be provided with a plurality of driving circuits capable of driving the light emitting portion to emit laser light, and the plurality of driving circuits may be distributed on both sides of the supporting portion on the substrate.
Also, the support portion may be formed using a ceramic material.
Also, the light emitting part may have cathodes and anodes, the number of the metal lines corresponding to the number of the cathodes and the anodes of the light emitting part, the metal lines being formed on the surface of the support part, the metal lines electrically connecting the cathodes and the anodes of the light emitting part to the substrate, respectively.
And the metal lines are disposed over the substrate to be perpendicular to the substrate, and a plurality of the metal lines are disposed parallel to each other.
According to the utility model discloses a laser radar of another embodiment includes: a laser transmitter module as described above that can be used in a lidar; and a laser receiving module having a sensor sensing light.
The lidar may further include: a rotating member that rotates the laser emitting module and the laser receiving module.
According to an embodiment of the present invention, the plurality of light emitting portions may be provided in the support portion to realize integration. Further, by providing the light emitting portion on the supporting portion made of ceramic material, heat dissipation and reliability of the light emitting portion are facilitated as compared with a case where the light emitting portion is directly provided on the printed circuit board. Further, since the plurality of light emitting sections are provided on one support section, it is not necessary to optically align the vertical cavity surface emitting lasers each provided on a different substrate when assembling the laser emitting module. And, be favorable to the miniaturization of laser emission module and laser radar.
Drawings
Fig. 1 is a perspective view illustrating a laser emission module according to an embodiment of the present invention.
Fig. 2 is a plan view illustrating a laser emission module according to an embodiment of the present invention.
Fig. 3 is a side view illustrating a laser emission module according to an embodiment of the present invention.
Fig. 4 is a view illustrating a metal wire formed at a support part according to an embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a laser radar according to an embodiment of the present invention.
Description of the symbols
10: the laser emitting module 20: laser receiving module
100: light emitting unit 200: supporting part
300: substrate 110: light emitting area
210: the metal wire 600: sensor with a sensor element
30: processor with a memory having a plurality of memory cells
Detailed Description
The technical solution of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the embodiments of the present invention. It is to be understood that the following disclosure of the present invention is directed to only some embodiments, but not all embodiments. All other embodiments obtained by a person skilled in the art without any inventive step based on the following embodiments belong to the protection scope of the present invention.
Also, in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the drawings, and are only for convenience of description of the simplified description of the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Fig. 1 is a perspective view illustrating a laser emission module 10 according to an embodiment of the present invention. Fig. 2 is a plan view illustrating the laser emission module 10 according to an embodiment of the present invention. Fig. 3 is a side view illustrating the laser emission module 10 according to an embodiment of the present invention.
The laser emitting module 10 may be disposed in the lidar and may emit laser light to return the laser light to the lidar after the laser light is reflected by an object outside the lidar, so that a distance between the surrounding object and the lidar may be measured by a time of flight (TOF) method.
As shown in fig. 1 to 3, a laser emitting module 10 according to an embodiment of the present invention includes a plurality of light emitting portions 100, a supporting portion 200, and a substrate 300. Although fig. 1 to 3 only show the plurality of light emitting parts 100, the supporting part 200, and the substrate 300, the laser emitting module 10 according to an embodiment of the present invention may further include a configuration not shown, such as a metal wire, a driving circuit, or a printed circuit.
The light emitting part 100 may be a Vertical Cavity Surface Emitting Laser (VCSEL). That is, laser light of a Vertical Cavity Surface Emitting Laser (VCSEL) is emitted perpendicular to the substrate. In contrast, the laser light of the edge-emitting laser (EEL) is emitted parallel to the substrate. Also, a Vertical Cavity Surface Emitting Laser (VCSEL) has lower production costs and higher reliability than an Edge Emitting Laser (EEL). Also, since laser light of a Vertical Cavity Surface Emitting Laser (VCSEL) is emitted in a perpendicular manner to the substrate, it can be more conveniently disposed to the laser emitting module. Therefore, Vertical Cavity Surface Emitting Lasers (VCSELs) are more suitable for realizing large-scale arrays than Edge Emitting Lasers (EELs).
The plurality of light emitting parts 100 may have a cathode and an anode, respectively. The light emitting portion 100 can emit laser light by supplying driving signals to the cathode and anode. The cathode and the anode may be connected to a driving circuit provided to the substrate 300.
Further, a region of the surface of the light emitting section 100 that emits laser light may be defined as a light emitting region 110. The light emitting region 110 may be located on the top surface of the light emitting part 100.
In an embodiment of the present invention, the number of the plurality of light emitting parts 100 included in the laser emitting module 10 may be plural.
The supporting portion 200 is disposed on the substrate 300. For example, the supporting portion 200 may be disposed on one surface of the substrate 300. The support portion 200 may support the light emitting portion 100 and may electrically connect the light emitting portion 100 to the substrate 300.
The support 200 may have a hexahedral shape, and preferably a rectangular parallelepiped shape. In the present embodiment, the surface of the support portion 200 contacting the substrate is referred to as a bottom surface; a surface of the support 200 facing the bottom surface is referred to as a top surface; four surfaces other than the bottom surface and the top surface of the support 200 are referred to as side surfaces; the longer two sides among the four sides of the support 200 are referred to as long sides; the shorter two sides among the sides of the support 200 are referred to as short sides.
In an embodiment of the present invention, as shown in fig. 1 to 3, the plurality of light emitting parts 100 are disposed on the supporting part 200, and more preferably, the plurality of light emitting parts 100 are disposed on the long side of the supporting part 200. Also, the plurality of light emitting parts 100 may be all provided on one long side surface of the supporting part 200, or the plurality of light emitting parts 100 may be distributed on both long side surfaces of the supporting part 200. Although fig. 1 to 3 show the case where the top surface of the light emitting part 100 is lower than the top surface of the support part 200, the top surface of the light emitting part 100 may be flush with the top surface of the support part 200.
The number of the light emitting parts 100 provided in the support part 200 is not limited. For example, 16, 32, or 64 light emitting portions may be provided on one long side surface of the support portion 200; alternatively, 8, 16, or 32 light emitting parts may be provided on both long side surfaces of the support part 200. The plurality of light emitting parts 100 may be arranged in a linear array on the support part 200. The plurality of light emitting units 100 may be arranged side by side on the support 200.
The number of the light emitting parts 100 provided on the support part 200 may be variously changed according to the needs of a designer, the sizes of the support part 200 and the light emitting parts 100, the number of driving circuits provided on the substrate 300, and the like.
The light emitting section 100 is preferably provided on the support section 200 such that the light emitting region 110 faces upward of the substrate 300, and more preferably, the direction of light emitted from the light emitting section 100 is perpendicular to the substrate 300. Alternatively, the direction of the light emitted from the light emitting part 100 may not be perpendicular to the substrate 300, and the direction of the laser light emitted from the light emitting part 100 provided in the support part 200 may be changed according to the shape of the support part 200, so that the light emitting part 100 emits the laser light obliquely upward from the substrate 300.
By causing the light emitting portion 100 to emit laser light with the support portion 200 disposed toward above the substrate 300, the emission direction of the laser beam can be changed from parallel to the substrate to perpendicular to the substrate in the related art. Therefore, the length of the laser emission module 10 in the laser emission direction can be reduced, and the length of the laser radar in the laser emission direction can be reduced.
The substrate 300 may be a Printed Circuit Board (PCB). A circuit may be formed on the substrate 300. The substrate 300 may be provided with a driving circuit that drives the light emitting unit 100 provided in the support 200 to cause the light emitting unit 100 to emit laser light.
The number of the driving circuits may correspond to the number of the light emitting parts 100. Also, the driving circuits may be distributed on both sides of the supporting part 200 on the substrate 300. Accordingly, the length of the substrate 300 required to arrange the driving circuit may be reduced compared to the case where the driving circuit is arranged at one side of the support portion 200.
In another embodiment of the present invention, the supporting portion 200 may be formed using a ceramic material. The ceramic material has high thermal conductivity and a thermal expansion coefficient more matched to the light emitting portion 100 than that of a general printed circuit board. Therefore, forming the supporting part 200 using a ceramic material can reduce a damage phenomenon caused by heat generation of the light emitting part 100.
Fig. 4 is a diagram illustrating a metal wire 210 formed at a support portion 200 according to an embodiment of the present invention. Fig. 4 shows a long side of a support portion 200 according to an embodiment of the present invention.
A metal wire 210 may be formed on a surface of the support part 200, and the metal wire 210 may electrically connect a cathode and an anode of the light emitting part 100 provided to the support part 200 to the substrate 300.
The metal line 210 may be formed using metal. For example, the metal line 210 may be made of a highly conductive metal such as gold, silver, copper, or aluminum. The material of the metal line 210 is not limited, and may be configured as follows: and a cathode and an anode formed on the support part 200 to electrically connect the light emitting part 100 to the substrate 300.
The metal lines 210 may be formed in a number corresponding to the number of cathodes and anodes of the light emitting part 100. Alternatively, the number of the metal wires 210 is not particularly limited as long as both the cathode and the anode of the light emitting part 100 can be electrically connected to the substrate 300.
The metal wire 210 may be formed on a side surface of the support part 200 on which the light emitting part 100 is disposed and a bottom surface of the support part 200, and a connection may be formed between the side surface and the bottom surface. The metal lines 210 may be formed in the same shape on the side and bottom surfaces of the supporting part 200. Therefore, when the light emitting part 100 is provided on the support part 200 and the support part 200 is provided on the substrate 300, the cathode and the anode of the light emitting part 100 can be electrically connected to the substrate 300, more specifically, to the driving circuit of the substrate 300.
As shown in fig. 4, the metal line 210 may be formed in a metal strip shape on the supporting portion 200. And the plurality of metal lines 210 may be spaced apart from each other, respectively. Further, a plurality of the metal lines 210 may be parallel to each other to prevent a connection therebetween. Further, the metal line 210 may be disposed over the substrate 300 perpendicularly to the substrate 300. By forming the metal lines 210 to be parallel to each other and perpendicular to the substrate, the forming process of the metal lines 210 may be simplified, the material of the metal lines 210 may be saved, and the isolation between the metal lines may be effectively ensured.
When the light emitting part 100 is disposed on the support part 200, the light emitting part 100 may be electrically connected to the metal wire 210 of the support part 200 by solder. Alternatively, the light emitting part 100 may be electrically connected to the metal line 210 by gold-tin alloy. The light emitting part 100 may be fixed to the support part 200 by the solder or the gold-tin alloy.
When the supporting portion 200 is disposed on the substrate 300, the metal wires 210 of the supporting portion 200 may be electrically connected to the circuit of the substrate 300 by solder. The support portion 200 may be fixed to the substrate 300 by the solder.
With the laser emitting module 10 as described above, the plurality of light emitting units 100 can be provided on the support unit 200 to be integrated. Further, by providing the light emitting portion 100 on the support portion 200 made of ceramic, heat dissipation of the light emitting portion 100 is facilitated as compared with a case where the light emitting portion 100 is provided on a printed circuit board, and the thermal expansion coefficient of ceramic is more matched to that of the light emitting portion 100. Further, since the plurality of light emitting sections 100 are provided on the support section 200 and the support section 200 is provided on the substrate 300, it is not necessary to optically align the edge-emitting lasers provided on different substrates when assembling the laser-emitting module 10, and it is only necessary to ensure the mounting accuracy of the light emitting sections 100 when providing the light emitting sections 100 on the support section 200. In the laser emitting module 10, since the plurality of light emitting parts 100 are attached to one support part 200, the laser emitting module 10 can be advantageously downsized.
Fig. 5 is a schematic diagram illustrating a laser radar according to an embodiment of the present invention.
Referring to fig. 5, a laser radar according to an embodiment of the present invention includes a laser emitting module 10, a laser receiving module 20, and a processor 30.
The laser emission module 10 described with reference to fig. 5 may be the same as the laser emission module 10 described with reference to fig. 1 to 3.
In the laser emitting module 10, the light emitting section 100 can emit laser light in a set order by driving of the driving circuit based on control of a control section (not shown).
Also, the laser light emitted by the light emitting part 100 may have a predetermined emission angle after being diverged by a diverging lens (not shown) of the laser radar provided on the light path. Thus, a predetermined vertical or horizontal angle range can be covered by a laser emission module according to the present invention. However, the horizontal angle range or the vertical angle range that the laser emitting module 10 can cover can be variously changed depending on the number of the light emitting units 100 and the divergent lenses.
The laser light emitted from the laser emission module 10 and diverged at the diverging lens is returned to the laser radar after being reflected by an object outside the laser radar. The light returned to the laser radar may be focused by a focusing lens (not shown) and then incident on the laser receiving module 20.
The laser receiving module 20 may include a sensor that senses light. At this time, the number of the sensors 600 included in the laser receiving module 20 may be one or more. The sensor 600 may be a photosensor such as an APD and SPAD. Also, the output signal of the sensor 600 may be transmitted to the processor 30. Processor 30 may calculate a separation distance of an object outside of the lidar from the lidar using the output signal of sensor 600 based on time of flight (TOF).
According to an embodiment of the present invention, the size of the laser transmitter module 10 can be reduced by the light emitting part 100, the supporting part 200 and the substrate 300, and the size of the laser transmitter module 10 can be reduced, so that the size of the laser receiver module 20 can be reduced accordingly. Therefore, the size of the entire laser radar can be reduced.
Also, the laser radar according to an embodiment of the present invention may further include a rotating member (not shown). The rotating member may rotate the laser transmitter module 10 and the laser receiver module 20. The rotation may be a 360 ° rotation.
The embodiments described above with respect to the apparatus and method are merely illustrative, where separate units described may or may not be physically separate, and the components shown as units may or may not be physical units, i.e. may be located in one location, or may be distributed over a plurality of network units. The technical scheme of the utility model can be realized by selecting some or all modules according to the actual needs.

Claims (9)

1. A laser transmitter module usable with a lidar comprising:
a substrate;
a support part disposed on the substrate and formed with a metal line;
a plurality of light emitting parts provided on the support part and capable of emitting laser light,
the plurality of light emitting parts are electrically connected to the substrate through the metal lines.
2. The laser transmit module for lidar of claim 1,
the light emitting section is a vertical cavity surface emitting laser.
3. The laser transmit module for lidar of claim 1,
the light emitting section emits laser light in a direction perpendicular to the substrate,
the top surface of the light emitting part is flush with the top surface of the support part.
4. The laser transmit module for lidar of claim 1,
a plurality of drive circuits capable of driving the light emitting section to emit laser light are provided on the substrate,
the plurality of driving circuits are distributed on two sides of the supporting part on the substrate.
5. The laser transmit module for lidar of claim 1,
the support portion is formed using a ceramic material.
6. The laser transmit module for lidar of claim 1,
the light emitting part has a cathode and an anode, the number of the metal lines corresponds to the number of the cathodes and the anodes of the light emitting part,
the metal wire is formed on the surface of the support part,
the metal wires electrically connect the cathode and the anode of the light emitting portion to the substrate, respectively.
7. The laser transmit module for lidar of claim 1,
the metal lines are disposed over the substrate to be perpendicular to the substrate, and a plurality of the metal lines are disposed parallel to each other.
8. A laser radar is characterized in that the laser radar is provided with a laser beam,
a laser transmitter module usable with a lidar comprising any one of claims 1 to 7;
and a laser receiving module having a sensor sensing light.
9. Lidar according to claim 8,
further comprising: a rotating member that rotates the laser emitting module and the laser receiving module.
CN202022430948.4U 2020-10-28 2020-10-28 Laser emission module for laser radar and laser radar Active CN212341443U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022430948.4U CN212341443U (en) 2020-10-28 2020-10-28 Laser emission module for laser radar and laser radar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022430948.4U CN212341443U (en) 2020-10-28 2020-10-28 Laser emission module for laser radar and laser radar

Publications (1)

Publication Number Publication Date
CN212341443U true CN212341443U (en) 2021-01-12

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Application Number Title Priority Date Filing Date
CN202022430948.4U Active CN212341443U (en) 2020-10-28 2020-10-28 Laser emission module for laser radar and laser radar

Country Status (1)

Country Link
CN (1) CN212341443U (en)

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