CN219417729U - Laser radar and optical transceiver module thereof - Google Patents

Abstract

The embodiment of the utility model provides a laser radar and an optical transceiver module thereof, and relates to the field of laser radars.

Description

Laser radar and optical transceiver module thereof

Technical Field

The utility model relates to the technical field of laser radars, in particular to a laser radar and an optical transceiver module thereof.

Background

Laser radar (Light Detection And Ranging, liDAR), is an acronym for laser detection and ranging system. The method comprises the steps of irradiating a measured target by emitting laser beams, and processing received target reflection signals so as to obtain information such as the position, distance, speed, angle and the like of the measured target. In recent years, with the development of autopilot technology, the laser radar, particularly the vehicle-mounted laser radar, has a severe requirement on reliability, and great challenges are presented to the design and production of the laser radar.

The optical transceiver module of the laser radar mainly realizes collimation and shaping of the emitted light beam and receives the target reflected signal. In the conventional laser radar production process, for the optical transceiver module, glue is mostly used to bond the optical element for fixing, so as to control the relative position of the optical element and ensure that the light beam is shaped accurately. However, after dispensing, the glue needs to be solidified by ultraviolet curing, heat curing, and the like, which takes a lot of time, resulting in low production efficiency of the laser radar and high failure rate of the optical element.

Disclosure of Invention

The utility model aims to provide a laser radar and an optical transceiver module thereof, which can solve the problems of low production efficiency and high failure rate of optical elements in the traditional laser radar production process.

In order to achieve the above object, the technical scheme adopted in the embodiment of the utility model is as follows:

in a first aspect, an embodiment of the present utility model provides an optical transceiver module of a laser radar, including a lens barrel body, a first optical element, a second optical element, and a fixing component;

the lens cone main body is hollow, openings communicated with the inner space are formed in two ends of the lens cone main body, and a boss is arranged on the inner wall and close to one opening;

the fixing component comprises a blocking piece with a hole in the center and a fixing piece;

the first optical element, the blocking piece, the second optical element and the fixing piece are sequentially arranged in the lens barrel body, one end, away from the blocking piece, of the first optical element is abutted to the side wall of the boss, and the first optical element and the second optical element are fixed through the matching of the blocking piece and the fixing piece.

Further, the optical transceiver module further comprises a force homogenizing piece with a hole in the center;

the force homogenizing piece is arranged in the lens barrel main body and is positioned between the fixing piece and the second optical element, so that the force exerted on the second optical element by the fixing piece is uniformly distributed.

Further, the fixing piece is in threaded fit with the lens barrel body, so that the first optical element and the second optical element are fixed on two sides of the blocking piece through torsion of the fixing piece screwed into the lens barrel body.

Further, the barrier comprises a spacer ring and the fixture comprises a clamping ring.

Furthermore, the surfaces of the space ring and the pressing ring are provided with extinction layers so as to eliminate stray light.

Further, the extinction layer comprises an anodic oxide layer.

Further, the matting layer comprises a matting paint layer.

Further, the thickness d1 of the matting layer satisfies: d1 is more than or equal to 5 μm and less than or equal to 80 μm.

Further, the material and expansion coefficient of the blocking piece and the lens barrel main body are the same.

Further, the force homogenizing piece comprises an elastic washer.

Further, the thickness d2 of the elastic washer satisfies: d2 is more than or equal to 0.5mm and less than or equal to 2mm.

In a second aspect, embodiments of the present utility model provide a lidar comprising an optical transceiver module of the lidar according to the first aspect.

The laser radar and the optical transceiver module thereof provided by the embodiment of the utility model comprise a lens barrel main body, a first optical element, a second optical element, a blocking piece and a fixing piece, wherein a hole for a light beam to pass through is formed in the lens barrel main body, a boss is arranged at the inner wall end, the first optical element, the blocking piece, the second optical element and the fixing piece are sequentially arranged in the lens barrel main body, one end of the first optical element, which is far away from the blocking piece, is abutted against the side wall of the boss, and the first optical element and the second optical element are fixed through the matching of the blocking piece and the fixing piece, so that the optical elements of the optical transceiver module are fixed in a glue-free mode, the production time consumption can be greatly reduced, the production efficiency is improved, the number of potential failure points in the optical transceiver module can be reduced, and the failure rate of the optical transceiver module can be reduced through the glue-free mode.

In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a conventional optical transceiver module.

Fig. 2 is a schematic structural diagram of an optical transceiver module of a lidar according to an embodiment of the present utility model.

Fig. 3 is a schematic structural view of a blocking member and a fixing member according to an embodiment of the present utility model.

Fig. 4 is a second schematic structural diagram of an optical transceiver module of a lidar according to an embodiment of the present utility model.

Reference numerals: 100-a structural member body; 110-an optical element; 120-dispensing grooves; 130-a barrel body; 131-a boss; 140-a first optical element; 150-a second optical element; 160-barriers; 170-a fixing piece; 180-force homogenizing piece.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present utility model, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present utility model and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.

The features of the embodiments of the present utility model may be combined with each other without collision.

The laser radar mainly comprises an optical transceiver module (comprising a transmitting module and a receiving module), a scanning module (optional), a control module and a signal processing module. The emission module performs beam shaping on the laser light source through optical elements (such as lenses, cylindrical mirrors, aspheric lenses, diffraction optical elements and the like) so as to achieve beam collimation or enable the beam to have a specific divergence angle. The receiving module uses optical elements (such as lenses, mirrors, prisms, etc.) to achieve convergent collection of the reflected signal of the target, so that the signal is irradiated onto the receiving detector.

At present, most of the laser radars use glue to bond optical elements for fixing so as to control the relative positions of the optical elements and ensure that light beams are shaped accurately. In order to cooperate with the optical element to glue, a glue dispensing groove structure is required to be processed in a fixing structure of the optical element for storing glue, and the glue is injected into the glue dispensing groove through a manual or automatic glue dispensing tool during glue dispensing, so that the glue is contacted with the optical element and the structural member, and then solidified in a mode of ultraviolet curing, heating curing and the like, so that the surface of the optical element is firmly and reliably connected with the structural member through the glue.

Referring to fig. 1, an optical module of a lidar has been proposed, which includes a structure body 100 and two optical elements 110. The structural member main body 100 is a solid mechanism for carrying the optical element 110, and has a hole formed therein, and two dispensing slots 120 with opposite positions are formed in the inner side wall. The two optical elements 110 are respectively disposed in the two dispensing slots 120, and glue is injected into the dispensing slots 120 to fix the optical elements 110.

When the optical element 110 is fixed by using glue, the optical element 110, a structural member bearing the optical element 110 and the glue need to be contacted with each other, wherein the required glue amount can be adjusted as required.

In the actual production process, a production person or an automatic device needs to dispense glue while adjusting the position of the optical element. The glue used for dispensing is usually a low-temperature curing glue or an ultraviolet curing glue, so that after the component is adjusted in place, a certain force can be applied to the component by utilizing the solidification of the glue, and the function of pre-fixing the optical component is achieved.

The glue adopted in the dispensing is extremely strict in selection, and needs to meet the requirements of low shrinkage, low halogen, UV and heat dual curing, good adhesive force, no corrosion to devices, suitability for various bonding base materials, high and low temperature impact resistance and the like. When dispensing, the surface characteristics of the bonding base material, the thickness of the glue, the dispensing pressure and the like need to be strictly controlled, and the pretreatment process and the dispensing process are complex.

Because the glue dispensing groove has a certain depth, glue needs to smoothly flow into the glue dispensing groove to uniformly coat the surface of the element, and the process needs to be repeatedly tested to develop a stable and reliable process to ensure the thickness and uniformity of the glue dispensing. In addition, when the optical element is pre-fixed by using the low-temperature curing glue or the ultraviolet curing glue, the glue is required to be heated at a higher temperature to achieve the bonding force, and the process usually needs to last for a few minutes to a few hours, so that the production process of the laser radar optical module is more lengthy and the production efficiency is low.

In the above-described conventional dispensing-fixing scheme of the optical element, if the glue fails, the optical element is caused to move in the structure body 100, for example, an axial movement in a light propagation direction, a lateral movement in a direction perpendicular to the optical axis, and tilting or rolling of the optical element.

Assuming that N optical elements exist in the laser radar optical transceiver module, the optical elements are all fixed by glue, and the failure probability of a single optical element is gamma, the total failure probability of the optical transceiver module is: p=1- (1- γ) ^N . If n=9, γ=0.1%, the total failure probability p=9%o is calculated. If n=9, γ=0.01%, the total failure probability p=0.9%o is calculated.

The high failure rate obviously cannot meet the requirements for lidar products, especially vehicle-mounted lidars.

Based on the above consideration, the embodiment of the utility model provides an optical transceiver module of a laser radar, which can solve the problems of low production efficiency and high failure rate of an optical element in the conventional laser radar production process.

In one possible embodiment, the present utility model provides an optical transceiver module of a laser radar, which may include a lens barrel body 130, a first optical element 140, a second optical element 150, and a fixing assembly, referring to fig. 2.

The lens barrel body 130 is hollow, two ends of the lens barrel body are provided with openings communicated with the inner space, and a boss 131 is arranged on the inner wall and near the position of one opening.

The securing assembly may include a baffle 160 with a central aperture and a securing member 170.

The first optical element 140, the blocking member 160, the second optical element 150 and the fixing member 170 are sequentially disposed in the barrel body 130, and one end of the first optical element 140 away from the blocking member 160 abuts against the sidewall of the boss 131, so that the first optical element 140 and the second optical element 150 are fixed by the cooperation of the blocking member 160 and the fixing member 170.

The first optical element 140 may be, but is not limited to: cylindrical mirrors, lenses, prisms, beam combining mirrors or reflectors, and the like. The second optical element 150 may be, but is not limited to: cylindrical mirrors, lenses, prisms, beam combining mirrors or reflectors, and the like. The specific choice may be determined according to the actual situation.

The lens barrel body 130 may be provided in any shape, for example, may be cylindrical, rectangular parallelepiped, or truncated cone. The internal space may be cylindrical, rectangular parallelepiped, or truncated cone. In the present embodiment, there is no particular limitation. In other embodiments, the boss 131 may be replaced with a hole, a platform, etc. for bearing against the optical element for positioning in one or more directions.

Note that, the boss 131 may be close to the light outlet of the lens barrel body 130, or may be close to the light inlet of the lens barrel body 130, and in this embodiment, the present utility model is not limited specifically.

The first optical element 140, the blocking member 160, the second optical element 150, and the fixing member 170 are placed in the barrel body 130 in order from the first optical element 140, the blocking member 160, the second optical element 150, and the fixing member 170, and the first optical element 140 approaches and abuts against the boss 131. The blocking member 160 plays a role in controlling the distance between the first optical element 140 and the second optical element 150, and the fixing member 170 plays a role in applying torsion to fix, so that the first optical element 140 and the second optical element 150 can be fixed at a certain interval distance under the action of the blocking member 160 and the fixing member 170.

Compared with the traditional glue dispensing and fixing mode, the optical transceiver module of the laser radar provided by the embodiment of the utility model has the advantages that the first optical element and the second optical element are fixed through the mechanical cooperation of the blocking piece and the fixing piece, so that the optical elements of the optical transceiver module are fixed in a glue-free mode, the production time consumption can be greatly reduced, and the production efficiency is improved. Meanwhile, the glue-free mode can be used for fixing, so that the number of potential failure points generated by glue in the optical transceiver module can be avoided, and the failure rate of the optical transceiver module is greatly reduced.

The outer profile shapes of the blocking member 160 and the fixing member 170 coincide with the inner space shape of the lens barrel body 130. For example, when the inner space of the lens barrel body 130 is cylindrical, the outer contour of the barrier 160 may be cylindrical, when the inner space of the lens barrel body 130 is a truncated cone, the outer contour of the barrier 160 may be a truncated cone, and when the inner space of the lens barrel body 130 is a cone, the outer contour of the barrier 160 may be a cone. Referring to fig. 3, the outer and inner contour shapes, i.e., the shape of the inner holes, of the blocking member 160 and the fixing member 170 may be arbitrarily set, for example, may be circular, may be rectangular, and may be elliptical or other irregular shape.

Further, in order to enable the fixing force applied by the fixing member 170 to uniformly act and protect the second optical element 150, in a possible embodiment, referring to fig. 4, the optical transceiver module according to the embodiment of the present utility model may further include a force homogenizing member 180 having a hole in the center.

The force homogenizing element 180 is disposed in the lens barrel body 130 and located between the fixing element 170 and the second optical element 150, so that the force exerted on the second optical element 150 by the fixing element 170 is uniformly distributed. The force equalization member 180 may be any shape, and in the present embodiment, is not particularly limited.

To further enhance the force homogenizing effect, in one possible embodiment, the force homogenizing member 180 may be an elastic washer. Further, considering that the excessively thick elastic washer affects both the beam and the torsion, the thickness d2 of the elastic washer may satisfy: d2 is more than or equal to 0.5mm and less than or equal to 2mm, so that the elastic gasket has better effect.

Note that, the force homogenizing element 180 is an optional element, and may not be suitable when the thickness of the second optical element 150 is larger, and is more suitable for a scene where the second optical element 150 is thinner.

To enable removal of the first optical element 140, the second optical element 150, the barrier 160, etc., in one possible embodiment, the fixing member 170 may be screw-fitted with the barrel body 130, e.g., the outer surface of the fixing member 170 may be provided with screw threads by which it is fitted with the inner wall of the barrel body 130, thereby fixing the first optical element 140 and the second optical element 150 on both sides of the barrier 160 by torsion generated by screwing the fixing member 170 into the stationary body. It should be appreciated that torsion is generated by the boss 131.

In one possible embodiment, to avoid damage to the optical element due to excessive torque, the torque force f may be limited, and the magnitude of the torque force f may be as follows: f is more than or equal to 0.2Nm and less than or equal to 5Nm.

Further, the blocking member 160 may be a spacer ring, and the fixing member 170 may be a pressing ring, so that the spacer ring and the pressing ring cooperate to realize blocking fixation of the first optical element 140 and the second optical element 150. Different optical transceiver modules have different parameter requirements, and accordingly, the separation distance between the first optical element 140 and the second optical element 150 is also different, so that the thickness of the barrier 160 can be adjusted according to practical application requirements.

The spacer ring may be made of metal, plastic, or other materials, or may be made of materials having a low expansion coefficient or the same or similar expansion system as that of the barrel body 130, or may be made of materials having the same expansion coefficient and material as those of the barrel body 130.

Because the optical transceiver module is mainly used for collimation and shaping of the emitted laser beam, receiving of the reflected laser, and the like, the laser beam or the ambient light can be reflected by the inner surfaces of the spacer ring and the pressing ring to generate stray light so as to influence the transceiving. To avoid or attenuate the effects of stray light, the inner and outer surfaces of the spacer ring may be machined to a smooth or threaded form.

In one possible embodiment, the surfaces of the spacer ring and the clamping ring are each provided with a matting layer for eliminating stray light.

The setting of extinction layer can be chosen in a flexible way, and extinction layer can be the anodic oxidation layer that forms through anodic oxidation, also can be the extinction lacquer layer that forms through spraying extinction lacquer.

In order to give a better effect to the matting layer, in one possible embodiment, the thickness d1 of the matting layer may be: d1 is more than or equal to 5 μm and less than or equal to 80 μm.

The extinction layer has the characteristic of high absorption and low reflection for light rays in a certain specific wave band, the wavelength range is 800-950 nm, particularly has the characteristic of strong absorption and low reflection for light waves between 885nm and 940nm, and the surface reflectivity is lower than 2%, so that the stray light generated by beam shaping or incidence of external environment light is eliminated.

In other embodiments, to further increase robustness, a small amount of glue may be used in the mounting of the first optical element, the second optical element, the spacer or the gasket for loosening of the optical elements. At this time, the main fixing force of the optical element still comes from the pressing ring and the spacing ring, the secondary fixing force comes from the glue, namely, the pressing ring is used as the main fixing mode, and the glue is used as the secondary fixing mode, so that the dependence of the optical element fixing on the glue can be greatly reduced, and the severe requirement on the reliability of the glue and the complexity of the glue dispensing process are further reduced.

When the glue is not used at all, the relative position between the optical elements is determined by the spacer rings, the force applied by the pressing rings for fixing the optical elements is transferred to the optical elements contacted with the spacer rings, the adverse effect caused by the failure of the glue is avoided, the failure problem of the glue is avoided, and the reliability of the optical transceiver module is improved.

According to the optical transceiver module of the laser radar, disclosed by the utility model, each optical component is fixed in a glue-less or glue-free mode, so that the number of potential failure points in the module is reduced, the failure probability of the optical transceiver module is reduced, and the reliability of the optical module and the laser radar is improved.

Based on the same inventive concept as the optical transceiver module of the lidar provided in the above embodiment, in a possible implementation manner, the embodiment of the present utility model further provides a lidar, which includes the optical transceiver module provided in the above embodiment.

In the laser radar, the optical elements of the optical transceiver module are fixed in a glue-free mode, so that the production time consumption can be greatly reduced, and the production efficiency of the laser radar is improved. And meanwhile, the number of potential failure points in the optical transceiver module can be reduced by fixing in a glue-free mode, so that the failure rate of the optical transceiver module is reduced, and the reliability of the laser radar is improved.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (12)

1. The optical transceiver module of the laser radar is characterized by comprising a lens barrel main body, a first optical element, a second optical element and a fixing assembly;

the lens cone main body is hollow, openings communicated with the inner space are formed in two ends of the lens cone main body, and a boss is arranged on the inner wall and close to one opening;

the fixing component comprises a blocking piece with a hole in the center and a fixing piece;

the first optical element, the blocking piece, the second optical element and the fixing piece are sequentially arranged in the lens barrel body, one end, away from the blocking piece, of the first optical element is abutted to the side wall of the boss, and the first optical element and the second optical element are fixed through the matching of the blocking piece and the fixing piece.

2. The lidar optical transceiver module of claim 1, further comprising a centrally perforated force homogenizing member;

the force homogenizing piece is arranged in the lens barrel main body and is positioned between the fixing piece and the second optical element, so that the force exerted on the second optical element by the fixing piece is uniformly distributed.

3. The optical transceiver module of claim 1 or 2, wherein the fixing member is screwed with the lens barrel body to fix the first optical element and the second optical element on both sides of the blocking member by a torsion force of the fixing member screwed into the lens barrel body.

4. The lidar optical transceiver module of claim 1 or 2, wherein the barrier comprises a spacer and the fixture comprises a clamping ring.

5. The optical transceiver module of claim 4, wherein the surfaces of the spacer ring and the pressing ring are each provided with an extinction layer to eliminate stray light.

6. The lidar optical transceiver module of claim 5, wherein the extinction layer comprises an anodic oxidation layer.

7. The lidar optical transceiver module of claim 5, wherein the matting layer comprises a matting paint layer.

8. The lidar optical transceiver module of claim 5, wherein the thickness d1 of the extinction layer satisfies: d1 is more than or equal to 5 and less than or equal to 80.

9. The optical transceiver module of claim 1 or 2, wherein the material and expansion coefficient of the barrier and the barrel body are the same.

10. The lidar optical transceiver module of claim 2, wherein the force homogenizing element comprises an elastic washer.

11. The lidar optical transceiver module of claim 10, wherein the thickness d2 of the elastic washer satisfies: d2 is more than or equal to 0.5 and less than or equal to 2mm.

12. A lidar comprising an optical transceiver module of a lidar according to any of claims 1 to 11.