Multi-line laser radar outgoing light axis adjusting device

Abstract

The application provides a multi-line laser radar outgoing light axis adjusting device, which is characterized by comprising an outgoing light main frame, the outgoing light main frame being provided with a light passing channel, a collimator shell being further arranged in the outgoing light main frame and being centrally penetrated, the collimator shell being rotatable, a fiber fixing sleeve being arranged at one end of the collimator shell, a fiber array being arranged at the center of the fiber fixing sleeve, a collimator lens being arranged at the other end of the collimator shell, an angle-variable adjustable mirror device being arranged at the end of the outgoing light main frame close to the collimator lens, and an outgoing light port being arranged at the side end of the outgoing light main frame, wherein the fiber array emits laser, the laser passes through the collimator lens and the light passing channel, is reflected by the adjustable mirror device, and is emitted from the outgoing light port.

Description

Technical Field

[0001] This utility model relates to the field of lidar, and in particular to a device for adjusting the output optical axis of a multi-line lidar. Background Technology

[0002] LiDAR is a high-precision sensor widely used in autonomous driving, intelligent transportation, and environmental monitoring. The stability and accuracy of its transmission system are crucial to its overall performance. Precise adjustment of the optical axis can effectively reduce signal attenuation and deviation during transmission, thereby improving detection range and resolution. Current multi-line LiDAR systems often use separate collimating or reflecting optical paths for each output beam, resulting in poor optical path compactness. Furthermore, each optical path needs to be adjusted separately during installation to match the ideal optical axis, leading to low production efficiency. Utility Model Content

[0003] This invention provides a device for adjusting the output optical axis of a multi-line lidar, which solves the problem that traditional multi-line lidar requires separate adjustment of each optical path, resulting in low adjustment efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a multi-line lidar output optical axis adjustment device, characterized in that: it includes an output optical main frame, the output optical main frame is provided with a light transmission channel, and a collimator housing with a central through-hole is also provided inside the output optical main frame. The collimator housing is rotatable, one end of the collimator housing is provided with an optical fiber fixing sleeve, the center of the optical fiber fixing sleeve is provided with an optical fiber array, the other end of the collimator housing is provided with a collimating lens, the end of the output optical main frame near the collimating lens is provided with an adjustable reflector device with a variable angle, and the side end of the output optical main frame is provided with an output port. The laser emitted by the optical fiber array passes through the collimating lens and the light transmission channel, is reflected by the adjustable reflector device, and is emitted from the output port.

[0005] In a preferred embodiment, the adjustable reflector device includes a reflector mounting base, a reflector is provided on the side of the reflector mounting base near the main beam of the emitted light, a reflector mounting surface is provided at one end of the main beam of the emitted light, a through hole is provided in the center of the reflector mounting surface, the reflector is located at the through hole of the reflector mounting surface, and the two ends of the through hole of the reflector mounting surface are respectively connected to the light transmission channel and the light output port.

[0006] In a preferred embodiment, the reflector mounting base is provided with at least three threaded second set screws. One end of each second set screw passes through the reflector mounting base and abuts against the reflector mounting surface. The reflector mounting surface is provided with multiple bolt holes, and the reflector mounting base is provided with multiple adjustment holes. Each adjustment hole contains an adjustment bolt, one end of which is threaded into the bolt hole. A corrugated spring is fitted around the outside of the adjustment bolt, with both ends of the corrugated spring abutting against the reflector mounting base and the reflector mounting surface, respectively. The diameter of the adjustment hole is larger than the diameter of the adjustment bolt.

[0007] In the preferred embodiment, the outer wall of the collimator housing is provided with a flange, and one end of the main beam of the emitted light is provided with a collimator pressure plate, which presses down on the flange.

[0008] In the preferred embodiment, the side wall of the output optical main frame is provided with a threaded first set screw, one end of which is pressed against the outer wall of the optical fiber fixing sleeve.

[0009] The beneficial effects of this invention are as follows: a single collimator is used in conjunction with a reflector, the angle between the reflector and the main beam of the emitted light is variable, so as to adjust the angle of the reflected light; the collimator housing can rotate to adjust the axial distribution posture of the multi-line laser; the fiber array is integrated at one end of the single collimator, so there is no need to pay special attention to the position of each beam of light, which reduces the difficulty of operation and the complexity of the system. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0011] Figure 1 This is a cross-sectional view of the present invention.

[0012] Figure 2 This is a structural diagram of the reflector adjustment of this utility model.

[0013] Figure 3 This is a cross-sectional view of the reflector adjustment structure of this utility model.

[0014] Figure 4 This is a schematic diagram of reflected light adjustment.

[0015] Figure 5 This is a diagram showing the orientation adjustment of a multi-line laser beam around its axis.

[0016] In the diagram: 1. Main frame for emitted light; 101. Light outlet; 102. Light transmission channel; 103. Mounting surface for reflector; 2. Collimator housing; 201. First set screw; 202. Collimating lens; 3. Fiber optic array; 4. Collimator pressure plate; 5. Adjustable reflector device; 6. Reflector; 601. Reflector mounting base; 602. Adjustment hole; 603. Adjustment bolt; 604. Second set screw; 605. Bolt hole; 606. Corrugated spring; 607. Countersunk hole structure; 608. Fiber optic fixing sleeve; 7. Fiber optic connector block; 8. Detailed Implementation

[0017] Example 1: like Figure 1-5Among them, a multi-line lidar output optical axis adjustment device is characterized by: including an output optical main frame 1, the output optical main frame 1 having a light transmission channel 102, and a collimator housing 2 with a central through-hole inside the output optical main frame 1. The collimator housing 2 is rotatable, and one end of the collimator housing 2 has an optical fiber fixing sleeve 7. The optical fiber fixing sleeve 7 has an optical fiber array 4 in the center, and the other end of the collimator housing 2 has a collimating lens 3. The end of the output optical main frame 1 near the collimating lens 3 has an adjustable reflector device 6 with a variable angle, and the side end of the output optical main frame 1 has an output port 101. The laser emitted by the optical fiber array 4 passes through the collimating lens 3 and the light transmission channel 102, is reflected by the adjustable reflector device 6, and is emitted from the output port 101.

[0018] One end of the fiber array 4 is fixed to the fiber connector block 8, embedded in the fiber fixing sleeve 7, and secured with glue, so that the fiber array 4 is located near the central axis. The fibers in the fiber array 4 are arranged in a straight line, so when the collimator housing 2 rotates relative to the output beam main frame 1, the attitude of the output beam will also change accordingly. The adjustable reflector device 6 can adjust the deflection angle relative to the reflector mounting surface 103 of the output beam main frame 1, thereby adjusting the optical axis of the output beam.

[0019] In a preferred embodiment, the adjustable reflector device 6 includes a reflector mounting base 602. A reflector 601 is provided on the side of the reflector mounting base 602 near the main beam 1. A reflector mounting surface 103 is provided at one end of the main beam 1. A through hole is provided in the center of the reflector mounting surface 103. The reflector 601 is located at the through hole of the reflector mounting surface 103. The two ends of the through hole of the reflector mounting surface 103 are respectively connected to the light transmission channel 102 and the light outlet 101.

[0020] The reflector 601 is embedded in the center of the reflector mounting base 602 and faces the through hole of the light-emitting main frame 1. The light transmission channel 102 is perpendicular to the central axis of the light outlet 101. The normal vector direction of the reflector mounting surface 103 makes a 45-degree angle with the central axis direction of the light transmission channel 102. The angle between the reflector 601 and the reflector mounting surface 103 can be freely adjusted.

[0021] In a preferred embodiment, the reflector mounting base 602 is provided with at least three threaded second set screws 605. One end of each second set screw 605 passes through the reflector mounting base 602 and abuts against the reflector mounting surface 103. The reflector mounting surface 103 is provided with multiple bolt holes 606. The reflector mounting base 602 is provided with multiple adjustment holes 603. Each adjustment hole 603 is provided with an adjustment bolt 604. One end of each adjustment bolt 604 is threadedly connected to the bolt hole 606. A corrugated spring 607 is sleeved on the outside of the adjustment bolt 604. Both ends of the corrugated spring 607 abut against the reflector mounting base 602 and the reflector mounting surface 103, respectively. The diameter of the adjustment hole 603 is larger than the diameter of the adjustment bolt 604.

[0022] The second set screw 605 is not entirely in a straight line.

[0023] The reflector mounting base 602 has a countersunk hole structure 608 on the side near the reflector mounting surface 103 for placing the corrugated spring 607.

[0024] Adjust the extension length of the second set screw 605 so that it abuts against the mounting surface 103 of the reflector. Due to the three-point fixing, adjust the depth of the three adjusting bolts screwed into the bolt holes 606 respectively. The corrugated spring is compressed to varying degrees, allowing the angle between the reflector mounting base 602 and the mounting surface 103 of the reflector to change within a certain range. The second set screw 605, by abutting against the mounting surface 103 of the reflector, works in conjunction with the elastic force of the corrugated spring 607 to prevent the angle of the reflector mounting base 602 from changing after adjustment.

[0025] In the preferred embodiment, the outer wall of the collimator housing 2 is provided with a flange 201, and one end of the main beam 1 is provided with a collimator pressure plate 5, which presses the flange 201.

[0026] Since the main beam emitter frame 1 is typically connected to the laser radar housing, it is difficult to replace. Therefore, a modular design is adopted to fabricate a high-precision collimator housing 2. The main components, including the fiber optic fixing sleeve 7, fiber optic array 4, and collimating lens 3, are integrated into the collimator housing 2. A detachable collimator clamping plate 5 is used to press the collimator housing 2 onto the main beam emitter frame 1 for easy replacement. The collimator clamping plate 5 has mounting holes on one side, which can be bolted to the outer flange of the main beam emitter frame 1.

[0027] In the preferred embodiment, the side wall of the output optical main frame 1 is provided with a threaded first set screw 202, one end of which is pressed against the outer wall of the optical fiber fixing sleeve 7.

[0028] The initial angle of the fiber optic fixing sleeve 7 can be adjusted, and then the first set screw 202 is tightened to lock the angle.

[0029] After the spin angle of the fiber array 4 is determined, the collimator pressure plate 5 is locked, and the first set screw locks the position of the fiber fixing sleeve 7.

[0030] Example 2: A laser radar output optical axis adjustment device comprises a fiber laser collimator, an output beam main frame, and an adjustable reflector. The fiber laser collimator includes an internal fiber array, a collimating lens, and an external collimator housing. The output beam main frame with through holes is fixed to the radar body, with the collimator inserted at one end and fixed to the main frame by a collimator clamping plate. A 45° reflector is mounted at the other end. Inside the collimator housing, the fiber array is formed by placing multiple single-mode fibers on a substrate with V-grooves and fixing them with clamping plates and UV adhesive. The front face of the fiber array is located on the focal plane of the lens, and the centerline of the array coincides with the optical axis of the lens. The collimating lens consists of at least one spherical or aspherical mirror. Pulsed laser light emitted from the end faces of the n fiber array is focused by the lens, forming n collimated beams with very small divergence angles. The farther the fiber is from the centerline of the array, the greater the angle of deviation of the collimated beam from the optical axis. Multi-line laser beams are incident on the adjustable reflector through the light-transmitting hole of the main frame. By rotating the collimator and adjusting the angle of the reflector, the laser beams can be emitted at an ideal angle through the light-transmitting hole and then incident on the scanning element inside the radar, ultimately forming a multi-line scanning beam to achieve high-precision and angular resolution three-dimensional measurement.

[0031] Working Principle: To ensure the output optical axis of the multi-line laser matches the receiving optical axis and achieves high-efficiency detection, the output direction must be adjustable during assembly. The coordinate system plane is perpendicular to the ideal optical axis, with the origin being the intersection of the ideal optical axis and the plane, which is also the intersection of the midline of the angle between the four ideal laser beams and the plane. The x-axis is the line connecting the intersections of the four ideal laser beams and the plane. When the output beam main frame is fixed to the radar structure, the actual output optical axis will deviate from the origin, and the fan-shaped beam formed by the actual light rays will not be parallel to the x-axis. The collimator rotation angle and the reflector can be adjusted simultaneously to align the four laser beams to the ideal position.

[0032] The collimator housing has a flat, trapezoidal shape for clamping; when rotated with an open-end wrench, the fan-shaped beam formed by the multi-line laser also rotates around the optical axis. The flat mirror is fixed in a recessed area of ​​a cover plate, which is mounted on the main beam frame via three adjusting screws along its outer edge. A wave spring is also fitted onto the threaded body between the cover plate and the main beam frame. When the adjusting screws are tightened, the wave spring is compressed, changing the mirror angle. Figure 5 In the coordinate system, the actual optical axis will move downwards, and the light surface will rotate counterclockwise along the optical axis; when the screw is tightened, the actual optical axis will move to the upper right, and the light surface will rotate clockwise along the optical axis; when the other screw is tightened, the actual optical axis will move to the upper left, and the light surface will rotate clockwise along the optical axis. By changing the tightness of the three screws, the reflector can be adjusted to the most suitable angle.

[0033] After adjusting both sides, use set screws to reinforce the connection between the cover plate and the main frame, and apply UV glue to the gap for curing to prevent vibration and impact from causing the reflector angle to change again. During this process, fine-tune the collimator to keep the light plane from shifting. Finally, use the collimator clamping plate to fix the collimator housing to the main frame to prevent rotation.

[0034] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A multi-line laser radar outgoing light axis adjustment device, characterized by: The system includes an output light main frame (1), which has a light transmission channel (102). The output light main frame (1) also has a centrally connected collimator housing (2). The collimator housing (2) is rotatable. One end of the collimator housing (2) is provided with an optical fiber fixing sleeve (7). The optical fiber fixing sleeve (7) has an optical fiber array (4) in the center. The other end of the collimator housing (2) is provided with a collimating lens (3). The end of the output light main frame (1) near the collimating lens (3) is provided with an adjustable reflector device (6) with a variable angle. The side end of the output light main frame (1) is provided with an output port (101). The laser emitted by the optical fiber array (4) passes through the collimating lens (3) and the light transmission channel (102), is reflected by the adjustable reflector device (6), and is emitted from the output port (101).

2. The apparatus according to claim 1, wherein: The adjustable reflector device (6) includes a reflector mounting base (602). A reflector (601) is provided on the side of the reflector mounting base (602) near the main beam (1) of the emitted light. A reflector mounting surface (103) is provided at one end of the main beam (1). A through hole is provided in the center of the reflector mounting surface (103). The reflector (601) is located at the through hole of the reflector mounting surface (103). The two ends of the through hole of the reflector mounting surface (103) are respectively connected to the light transmission channel (102) and the light outlet (101).

3. The apparatus according to claim 2, wherein: The reflector mounting base (602) is provided with at least three threaded second set screws (605). One end of the second set screw (605) passes through the reflector mounting base (602) and abuts against the reflector mounting surface (103). The reflector mounting surface (103) is provided with multiple bolt holes (606). The reflector mounting base (602) is provided with multiple adjustment holes (603). Each adjustment hole (603) is provided with an adjustment bolt (604). One end of each adjustment bolt (604) is threadedly connected to the bolt hole (606). A corrugated spring (607) is sleeved on the outside of the adjustment bolt (604). Both ends of the corrugated spring (607) abut against the reflector mounting base (602) and the reflector mounting surface (103) respectively. The diameter of the adjustment hole (603) is larger than the diameter of the adjustment bolt (604).

4. The apparatus according to claim 1, wherein: The outer wall of the collimator housing (2) is provided with a flange (201), and one end of the main beam (1) is provided with a collimator pressure plate (5), which presses down the flange (201).

5. The apparatus of claim 4, wherein: the first and second mirrors are mounted on a common support; and the first and second mirrors are movable relative to the common support. The side wall of the output optical main frame (1) is provided with a first set screw (202) with threaded connection, and one end of the first set screw (202) is pressed against the outer wall of the optical fiber fixing sleeve (7).

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