Laser emitting structure capable of eliminating stray light and laser emitting and receiving device

Abstract

The invention relates to a laser emitting structure capable of eliminating stray light and a laser emitting and receiving device. The structure comprises an emitting element, an emitting sleeve and an emitting lens, the transmitting sleeve comprises a transmitting element mounting section, a laser passing section, a laser stray light absorption section and a transmitting lens mounting section which are connected in sequence, the transmitting element is arranged in the transmitting element mounting section, the transmitting lens is arranged in the transmitting lens mounting section, and the laser stray light absorption section is provided with black internal threads. Compared with the prior art, stray light is eliminated by changing the internal structure of the emitting sleeve, the black internal thread structure is innovatively arranged in the emitting sleeve, and strong light emitted at a time is weakened or absorbed after being reflected by the stray light reflected by the emitting sleeve for multiple times through the black internal thread structure; the halo phenomenon existing in an existing device can be effectively eliminated, and the near-field measurement precision of the laser radar is improved.

Description

Technical Field

[0001] The present invention relates to the field of laser radar technology, and in particular to a laser emitting structure and a laser emitting and receiving device capable of eliminating stray light. Background Art

[0002] Since the emergence of LiDAR, it has been applied to many fields such as robots, AGVs and automobiles. With the continuous increase in demand, the measurement accuracy requirements for LiDAR are also getting higher and higher, and the measurement accuracy has high requirements on the accuracy of laser alignment.

[0003] During the research and development process, the designers discovered that the existing laser radar's transmitting sleeve would form a halo phenomenon after alignment. The presence of the halo would affect the laser radar's near-field measurement accuracy. Summary of the invention

[0004] The designer studied the halo phenomenon formed after the collimation of the existing laser radar's transmitting sleeve and found that the stray light is caused by the reflection of the inner wall of the transmitting sleeve hitting the edge of the transmitting lens. Although the theoretical laser is a point light, the actual laser light is a small rectangle. In this way, the light emitted from the edge of the rectangle will hit the inner wall of the sleeve before reaching the collimator, thus causing stray light. This kind of stray light will form a halo phenomenon after passing through the collimator, which will affect the near-field measurement accuracy of the laser radar. For this reason, the designer proposed a laser transmitting structure and a laser transmitting and receiving device that can eliminate stray light.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] One of the purposes of the present invention is a laser emission structure capable of eliminating stray light, comprising an emission element, an emission sleeve and an emission lens;

[0007] The transmitting sleeve comprises an transmitting element installation section, a laser passing section, a laser stray light absorption section and an transmitting lens installation section which are connected in sequence, the transmitting element is arranged in the transmitting element installation section, the transmitting lens is arranged in the transmitting lens installation section, and the laser stray light absorption section is provided with a black internal thread.

[0008] Furthermore, the emitting element includes an emitting PCBA board and a laser arranged on the emitting PCBA board, and the laser is installed in the emitting element installation section.

[0009] Furthermore, the laser is arranged at the focus of the emitting lens.

[0010] Furthermore, the emitting lens is a plano-convex lens.

[0011] Furthermore, a sleeve aperture is also provided in the emitting lens installation section, and the sleeve aperture is provided on a side of the emitting lens away from the laser stray light absorption section.

[0012] The second object of the present invention is a laser emitting and receiving device, comprising a receiving lens, a receiving PCBA board, a filter, and a laser emitting structure capable of eliminating stray light as described above;

[0013] The receiving lens is a plano-convex lens, a through hole is provided at the optical axis position, and the transmitting sleeve passes through the through hole and is fixedly connected to the receiving lens;

[0014] The receiving PCBA board is arranged opposite to the transmitting PCBA board, and a filter is provided on a side of the receiving PCBA board facing the transmitting PCBA board.

[0015] Furthermore, the receiving lens and the transmitting lens are arranged in the same direction and on the same axis, and the convex surface is arranged on the side away from the transmitting element.

[0016] Further, the device also includes a core bracket, and a digital PCBA board arranged above the core bracket;

[0017] The digital PCBA board is provided with an optical bracket, the receiving PCBA board is provided on one side of the optical bracket vertically connected to the digital PCBA board, and the transmitting PCBA board is provided between the digital PCBA board and one side of the optical bracket parallel to the digital PCBA board.

[0018] Furthermore, the digital PCBA board and the receiving PCBA board are connected via a transfer FPC arranged therebetween.

[0019] Furthermore, the device further comprises an optical cover, and the optical cover is mounted on the core support.

[0020] Furthermore, a power board is arranged at the bottom of the core bracket.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] (1) The present invention provides a laser emission structure capable of eliminating stray light. The structure eliminates stray light by changing the internal structure of an emission sleeve. An innovative black internal thread structure is provided inside the emission sleeve. The black internal thread structure weakens or absorbs the stray light reflected by the emission sleeve after multiple reflections of the strong light emitted once. This can effectively eliminate the halo phenomenon existing in the existing device and improve the near-field measurement accuracy of the laser radar.

[0023] (2) The present invention provides a laser emission structure capable of eliminating stray light. The structure further eliminates stray light through a sleeve aperture, thereby further reducing the amount of stray light that passes through the optical cover and reaches the external object to be measured.

[0024] (2) The present invention provides a laser emitting structure that can eliminate stray light without changing the layout of existing devices and with little increase in machine cost.

[0025] (3) The present invention provides a laser emitting and receiving device, which can improve the emission halo phenomenon of the existing laser radar, improve the near-field test accuracy of the laser radar, reduce the laser radar software's calculation of stray light, reduce the laser radar's power consumption, reduce the laser radar's emission, and increase the laser radar's service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the laser emitting and receiving device in Example 1;

[0027] Figure 2 is a schematic diagram of a laser emission structure capable of eliminating stray light in Example 1;

[0028] Figure 3 is a schematic diagram of a laser emitting and receiving device in Example 2;

[0029] Figure 4 is a schematic diagram of a laser emission structure capable of eliminating stray light in Example 2;

[0030] As shown in the figure: 1-core bracket; 2-transfer FPC; 3-optical cover; 4-receiving PCBA board; 5-filter; 6-optical bracket; 7-transmitting PCBA board; 8-laser; 9-receiving lens; 10-transmitting sleeve; 101-transmitting element installation section; 102-laser passing section; 103-laser stray light absorption section; 104-transmitting lens installation section; 11-transmitting lens; 12-digital PCBA board; 13-sleeve aperture; a-light schematic. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0032] Example 1

[0033] In order to eliminate the halo phenomenon of the launch sleeve and improve the near-field measurement accuracy of the laser radar, this embodiment provides a laser launch structure that can eliminate stray light. The specific structure is shown in Figure 1-2 , including a transmitting element, a transmitting sleeve 10 and a transmitting lens 11;

[0034] The transmitting sleeve 10 includes an transmitting element installation section 101, a laser passing section 102, a laser stray light absorption section 103 and an transmitting lens installation section 104 which are connected in sequence. The transmitting element is arranged in the transmitting element installation section 101, the transmitting lens 11 is arranged in the transmitting lens installation section 104, and the laser stray light absorption section 103 is provided with a black internal thread.

[0035] Please see again Figure 1-2 In this embodiment, the emitting element includes an emitting PCBA board 7 and a laser 8 arranged on the emitting PCBA board 7, and the laser 8 is installed in the emitting element installation section 101.

[0036] The laser 8 is arranged at the focus of the emitting lens 11; the emitting lens 11 is a plano-convex lens.

[0037] This embodiment also provides a laser emitting and receiving device, including a receiving lens 9, a receiving PCBA board 4, a filter 5, and a laser emitting structure capable of eliminating stray light provided in this embodiment;

[0038] The receiving lens 9 is a plano-convex lens, and a through hole is provided at the optical axis position, and the transmitting sleeve 10 passes through the through hole and is fixedly connected to the receiving lens 9;

[0039] The receiving PCBA board 4 is arranged opposite to the transmitting PCBA board 7 , and a filter 5 is provided on a side of the receiving PCBA board 4 facing the transmitting PCBA board 7 .

[0040] Please see again Figure 1 In this embodiment, the receiving lens 9 and the transmitting lens 11 are arranged in the same direction and on the same axis, and the convex surface is set on the side away from the transmitting element.

[0041] Please see again Figure 1 In this embodiment, the device further includes a core bracket 1, and a digital PCBA board 12 arranged above the core bracket 1; an optical bracket 6 is arranged on the digital PCBA board 12, the receiving PCBA board 4 is arranged on a side of the optical bracket 6 vertically connected to the digital PCBA board 12, and the transmitting PCBA board 7 is arranged between the digital PCBA board 12 and a side of the optical bracket 6 parallel to the digital PCBA board 12. Specifically, the digital PCBA board 12 and the transmitting PCBA board 7 are both connected to the optical bracket 6 by welding.

[0042] Please see again Figure 1In this embodiment, the digital PCBA board 12 is connected to the receiving PCBA board 4 through a transfer FPC 2 disposed therebetween. Specifically, the two ends of the transfer FPC 2 are buckled onto the receiving PCBA board 4 and the digital PCBA board 12 to achieve the connection between the two.

[0043] Please see again Figure 1 In this embodiment, the device further comprises an optical cover 3, and the optical cover 3 is mounted on the core bracket 2; a power supply board is arranged at the bottom of the core bracket 1.

[0044] Working principle:

[0045] The internal black thread structure of the transmitting sleeve 10 in this embodiment prevents the light emitted from the edge of the laser 8 from being directly reflected to the back of the transmitting lens 11, and is reflected and absorbed multiple times by the internal black thread of the transmitting sleeve 10. Figure 2 The middle light is shown as a, so that as little light as possible passes through the transmitting lens 11 and reaches the object to be measured outside the optical housing 3. Reducing such halo phenomenon can reduce the reflection phenomenon of the side of a single object during the near-field test of the laser radar, and avoid the optical side of the object to be measured from entering the receiving lens 9, which is focused by the receiving lens 9 and then passes through the filter 5 to hit the photosensitive device of the receiving PCBA board 4. The receiving PCBA board 4 transmits the signal to the digital PCBA board 12 through the adapter FPC 2, and then is output to the outside by the software operation of the digital PCBA board 12.

[0046] Example 2

[0047] This embodiment is basically the same as Embodiment 1, except that a sleeve aperture 13 is further provided in the emitting lens mounting section 104 in this embodiment, and the sleeve aperture 13 is provided on a side of the emitting lens 11 away from the laser stray light absorption section 103 .

[0048] Working principle:

[0049] After the internal black thread of the transmitting sleeve 10 in this embodiment intercepts the edge light emitted by the laser 8, the sleeve aperture 13 is used to intercept the stray light passing through the edge of the transmitting lens 11. After multiple reflections and absorption by the internal black thread of the transmitting sleeve 10, as little stray light as possible passes through the transmitting lens 11. However, in order to better control the stray light, a sleeve aperture 13 is added outside the transmitting lens 11 to intercept the stray light, so that less useless light passes through the optical cover 3 to reach the external measured object. Reducing this kind of halo phenomenon can reduce the reflection phenomenon of the side of a single object during the near-field test of the laser radar, and prevent the light from the side of the measured object from entering the receiving lens 9. After being focused by the receiving lens 9 and passing through the filter 5, it hits the photosensitive device of the receiving PCBA board 4. The receiving PCBA board 4 transmits the signal to the digital PCBA board 12 through the adapter FPC 2, and then is output to the outside by the software calculation of the digital PCBA board 12.

[0050] The above is only a preferred embodiment of the present invention, and does not limit the present invention in other forms. Any technician familiar with the profession may use the above disclosed technical content to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the technical solution of the present invention still belongs to the protection scope of the technical solution of the present invention.

Claims

1. A laser emission structure capable of eliminating stray light, characterized in that: It comprises a transmitting element, a transmitting sleeve (10) and a transmitting lens (11); The transmitting sleeve (10) comprises an transmitting element mounting section (101), a laser passing section (102), a laser stray light absorption section (103) and a transmitting lens mounting section (104) which are connected in sequence; the transmitting element is arranged in the transmitting element mounting section (101); the transmitting lens (11) is arranged in the transmitting lens mounting section (104); and the laser stray light absorption section (103) is provided with a black internal thread.

2. A laser emitting structure capable of eliminating stray light according to claim 1, characterized in that: The emitting element comprises an emitting PCBA board (7) and a laser (8) arranged on the emitting PCBA board (7), and the laser (8) is installed in the emitting element installation section (101).

3. A laser emitting structure capable of eliminating stray light according to claim 2, characterized in that: The laser (8) is arranged at the focus of the transmitting lens (11).

4. The laser emitting structure capable of eliminating stray light according to claim 1, characterized in that: The emitting lens (11) is a plano-convex lens.

5. The laser emitting structure capable of eliminating stray light according to claim 1, characterized in that: A sleeve aperture (13) is also provided in the emission lens installation section (104), and the sleeve aperture (13) is provided on a side of the emission lens (11) away from the laser stray light absorption section (103).

6. A laser emitting and receiving device, characterized in that: It comprises a receiving lens (9), a receiving PCBA board (4), a filter (5), and a laser emission structure capable of eliminating stray light as claimed in any one of claims 1 to 5; The receiving lens (9) is a plano-convex lens, a through hole is provided at the optical axis position, and the transmitting sleeve (10) passes through the through hole and is fixedly connected to the receiving lens (9); The receiving PCBA board (4) is arranged opposite to the transmitting PCBA board (7), and a filter (5) is provided on the side of the receiving PCBA board (4) facing the transmitting PCBA board (7).

7. A laser emitting and receiving device according to claim 6, characterized in that: The receiving lens (9) and the transmitting lens (11) are arranged in the same direction and on the same axis, and the convex surface is arranged on the side away from the transmitting element.

8. A laser emitting and receiving device according to claim 6, characterized in that: The device also includes a core support (1), and a digital PCBA board (12) arranged above the core support (1); An optical bracket (6) is arranged on the digital PCBA board (12); the receiving PCBA board (4) is arranged on a side of the optical bracket (6) vertically connected to the digital PCBA board (12); and the transmitting PCBA board (7) is arranged between the digital PCBA board (12) and a side of the optical bracket (6) parallel to the digital PCBA board (12).

9. A laser emitting and receiving device according to claim 8, characterized in that: The digital PCBA board (12) and the receiving PCBA board (4) are connected via a transfer FPC (2) arranged therebetween.

10. A laser emitting and receiving device according to claim 8, characterized in that: The device further comprises an optical cover (3), wherein the optical cover (3) is mounted on the core support (2).

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