Lens module, laser module and lidar device

Abstract

The present invention provides a lens module, a laser module and a laser radar device. The lens module includes a sleeve and a lens assembly arranged inside the sleeve. The lens assembly includes a lens fixing seat and a lens. The lens fixing seat has a receiving hole. The lens is arranged in the receiving hole of the lens fixing seat. The optical axis of the lens and the central symmetry axis of the outer wall surface of the lens fixing seat are parallel to each other and separated by a preset distance, and the lens fixing seat is made of plastic material. By making the central symmetry axes of the lens fixing seat and the lens parallel to each other and separated by a preset distance, when the lens assembly is applied to the laser radar device of a sweeping robot, it can make the light emitted by the laser assembly deflect by a certain angle, thereby meeting the needs of its practical application.

Description

[0001] This application is a divisional application of a patent application named "Lens assembly, lens module, laser module and lidar device", application number 202111550938.7 and application date December 17, 2021. Technical Field

[0002] The present invention belongs to the field of laser technology, and specifically relates to a lens assembly, a lens module, a laser module and a laser radar device. Background Art

[0003] In 2009, Neato released a laser radar for robots. The laser radar uses the triangulation method between the laser transmitter and the receiver to measure the distance to the obstacle. The laser ranging sensor is installed on the motor, and measures the distance within a 360° range by rotating, and draws an indoor map based on this. The laser transmitter is one of the core components of the laser radar. In conventional application scenarios, in order to adjust the focal length of the laser transmitter, and then adjust the position and shape of the projected light spot generated by the laser transmitter to meet the standard, the laser transmitter is usually set as a two-stage structure. The optical lens is located in one section, and the laser component is located in the other section. The two-stage structure is connected by threads to achieve the function of adjusting the position of the laser component. However, in the process of adjusting the focal length by threading, due to the influence of the accuracy of the threaded connection, the position of the projected light spot generated is usually not fixed in the same position, but will move within a certain range. This situation will undoubtedly affect the consistency of the product and easily increase the defective rate of the laser transmitter. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, embodiments of the present invention provide a lens assembly, a lens module, a laser module and a laser radar device to solve the problems of high defective rate and poor consistency of the laser module in the prior art.

[0005] One embodiment of the present invention provides a lens assembly, comprising:

[0006] A lens fixing seat, wherein the lens fixing seat has a receiving hole; and

[0007] A lens is arranged in the receiving hole of the lens fixing seat;

[0008] Wherein, the optical axis of the lens and the central symmetry axis of the outer wall surface of the lens fixing seat are parallel to each other and spaced apart by a preset distance.

[0009] In one embodiment, the central symmetry axis of the receiving hole of the lens fixing seat is coaxially arranged with the optical axis of the lens; and

[0010] The central symmetry axis of the accommodating hole of the lens fixing seat and the central symmetry axis of the outer wall surface of the lens fixing seat are parallel to each other and spaced apart by the preset distance.

[0011] In one embodiment, the lens fixing seat further includes a light-through hole, and the light-through hole is connected to the accommodating hole;

[0012] The aperture of the light-through hole is smaller than the aperture of the receiving hole, so that a step portion is formed at the connection between the receiving hole and the light-through hole, and one end of the lens abuts against the step portion;

[0013] And / or, the central symmetry axis of the light-through hole and the central symmetry axis of the receiving hole are parallel to each other and are separated by the preset distance;

[0014] And / or, the central symmetry axis of the light through hole is coaxially arranged with the central symmetry axis of the outer wall surface of the lens fixing seat.

[0015] In one embodiment, the lens holder includes a first end and a second end, the first end of the lens holder is used to receive light input; the second end of the lens holder is used to output light;

[0016] The accommodating hole is arranged at the second end of the lens fixing seat.

[0017] In one embodiment, the outer wall surface of the lens fixing seat includes a first part and a second part, the first part of the outer wall surface is arranged close to the first end, the second part of the outer wall surface is arranged close to the second end, and the cross-sectional radius of the second part of the outer wall surface perpendicular to the central symmetry axis is smaller than the cross-sectional radius of the first part of the outer wall surface perpendicular to the central symmetry axis.

[0018] In one embodiment, a cross-sectional radius of the second portion of the outer wall surface perpendicular to the central symmetry axis gradually decreases in a direction approaching the second end surface.

[0019] In one embodiment, the axial length of the second portion of the outer wall is greater than the depth of the accommodating hole.

[0020] In one embodiment, the preset distance between the optical axis of the lens and the central symmetry axis of the outer wall of the lens fixing seat is 0.07 mm to 0.13 mm.

[0021] One embodiment of the present invention provides a lens module, comprising:

[0022] sleeve; and

[0023] The lens assembly as described in any one of the above embodiments is arranged inside the sleeve.

[0024] In one embodiment, the sleeve comprises:

[0025] Mounting holes;

[0026] light exit hole; and

[0027] A positioning portion, the positioning portion is arranged between the mounting hole and the light exit hole, and the lens assembly is arranged in the mounting hole;

[0028] The lens fixing seat comprises a first end and a second end, the second end of the lens fixing seat is arranged to abut against the positioning portion, and the first end of the lens fixing seat is arranged away from the positioning portion.

[0029] In one embodiment, the outer wall surface of the lens fixing seat includes a first part and a second part, the first part of the outer wall surface is arranged close to the first end, and the second part of the outer wall surface is arranged close to the second end, the cross-sectional radius of the first part of the outer wall surface perpendicular to the central axis of symmetry is larger than the cross-sectional radius of the mounting hole perpendicular to the central axis of symmetry, the cross-sectional radius of a part of the second part of the outer wall surface close to the second end perpendicular to the central axis of symmetry is smaller than the cross-sectional radius of the mounting hole perpendicular to the central axis of symmetry, the cross-sectional radius of a part of the second part of the outer wall surface away from the second end perpendicular to the central axis of symmetry is larger than the cross-sectional radius of the mounting hole perpendicular to the central axis of symmetry, and the second part of the outer wall surface of the lens fixing seat is interference fit with the mounting hole.

[0030] In one embodiment, the mounting hole includes a first mounting hole and a second mounting hole;

[0031] The first mounting hole is arranged at one end close to the positioning portion, and the first mounting hole is used to accommodate the lens assembly;

[0032] The second mounting hole is arranged at an end away from the positioning portion, and the second mounting hole is used to accommodate the laser component.

[0033] In one embodiment, the central symmetry axis of the outer circumference of the sleeve, the central symmetry axis of the inner circumference of the mounting hole, the central symmetry axis of the inner circumference of the light outlet hole and the central symmetry axis of the outer wall of the lens fixing seat are coaxially arranged.

[0034] In one embodiment, the sleeve is an integrated structure;

[0035] And / or, the sleeve is made of a heat-conducting material, and the strength of the sleeve is greater than the strength of the lens fixing seat.

[0036] In one embodiment, the sleeve is made of metal material, and the lens fixing seat is made of plastic material.

[0037] One embodiment of the present invention provides a laser module, comprising:

[0038] A lens module as described in any one of the above embodiments; and

[0039] The laser assembly is arranged inside the sleeve. The light emitted by the laser assembly passes through the lens inside the lens assembly and then exits the lens module. The optical axis of the laser assembly and the optical axis of the lens are parallel to each other and spaced by the preset distance.

[0040] In one embodiment, the lens fixing seat includes a first end and a second end, and the sleeve includes a mounting hole, a light emitting hole; and a positioning portion, wherein the positioning portion is arranged between the mounting hole and the light emitting hole, the second end of the lens fixing seat is arranged in abutment with the positioning portion, and the first end of the lens fixing seat is arranged close to the laser assembly.

[0041] In one embodiment, the mounting hole includes a first mounting hole and a second mounting hole, the first mounting hole is arranged at an end close to the positioning portion, and the second mounting hole is arranged at an end away from the positioning portion, the first mounting hole, the second mounting hole and the light exit hole are connected, the second mounting hole and the light exit hole are respectively located at two ends of the first mounting hole, the lens assembly is arranged in the first mounting hole, the laser assembly is arranged in the second mounting hole, and the optical axis of the laser assembly is coaxially arranged with the central symmetry axis of the second mounting hole.

[0042] In one embodiment, the laser assembly includes a base and a light source arranged on the base, the base of the laser assembly is embedded in the second mounting hole of the sleeve, the central symmetry axis of the base of the laser assembly is coaxially arranged with the central symmetry axis of the second mounting hole, and the central symmetry axis of the outer wall surface of the lens fixing seat is coaxially arranged with the central symmetry axis of the first mounting hole.

[0043] In one embodiment, the laser module is a laser emission module.

[0044] One embodiment of the present invention further provides a laser radar device, comprising a laser module as described in any one of the above.

[0045] The lens assembly, lens module, laser module or laser radar device provided in the above embodiments has the following beneficial effects:

[0046] 1. In conventional laser modules, the lens is usually in direct contact with the sleeve. During the assembly process, the lens is directly pressed against the sleeve, which makes the lens easy to be damaged. In addition, the contact stress between the lens and the sleeve will cause the lens to be easily broken due to falling or collision during subsequent transportation or use. In the embodiment of the present invention, by setting the lens in the receiving hole of the lens fixing seat, when the lens assembly is assembled into the sleeve of the lens module, the lens fixing seat can protect the lens, thereby avoiding direct contact between the lens and the sleeve. At this time, the stress generated during transportation or use is not easy to be directly transmitted to the lens through the sleeve, thereby avoiding the situation of lens breakage.

[0047] 2. When the lens assembly is used in a laser radar device, such as a laser radar of a sweeping robot, it is usually necessary to make the light emitted by the laser assembly deflect at a specific angle after passing through the lens. Generally speaking, the optical axis of the lens and the optical axis of the laser assembly are parallel to each other and separated by a preset distance, thereby producing the above-mentioned deflection effect to meet the needs of the actual application scenarios of the laser radar device. In a conventional laser module, the lens is usually in direct contact with the sleeve, and the sleeve is usually made of metal. At this time, it is necessary to machine a lens mounting hole with an eccentric axis on the sleeve by mechanical processing. On the one hand, a lens mounting hole and a light source mounting hole are machined in a metal sleeve, wherein the central symmetry axis of the lens mounting hole is parallel to the central symmetry axis of the sleeve and separated by a preset distance, and the central symmetry axis of the light source mounting hole is coaxial with the central symmetry axis of the sleeve. Therefore, multiple processes are required to process the sleeve multiple times to form lens mounting holes and light source assembly mounting holes with different axes, and each of the above processing requires the use of different fixtures and repositioning, which easily leads to processing positioning deviations, and it is difficult to ensure the offset distance accuracy of the central symmetry axis of the manufactured lens mounting hole. On the other hand, processing the lens mounting hole and the light source assembly mounting hole of different axes on the sleeve requires more processes and different fixtures, so the processing cost is also high. In the embodiment of the present invention, the lens is installed in the lens fixing seat, and the lens fixing seat is made by injection molding. On the one hand, the lens fixing seat made by injection molding forms the lens fixing seat and the receiving hole for installing the lens at one time, and the central axis of the receiving hole and the central symmetry axis of the lens fixing seat are parallel to each other and spaced by a preset distance, so that the optical axis deviation accuracy of the lens is relatively high, so that the deflection angle generated by the light emitted by the laser assembly after passing through the lens is more accurate. On the other hand, the lens fixing seat made by injection molding eliminates the process of making a through hole with an eccentric axis on the metal sleeve, thereby saving the manufacturing cost of the laser module.

[0048] 3. In a conventional laser module, the distance between the laser assembly and the lens is adjusted by a threaded connection. However, since the threaded connection has a certain matching error, this matching error will further affect the position of the projection spot after the laser assembly passes through the lens. That is, when the shape of the projection spot after the laser assembly passes through the lens meets the requirements, the position of the projection spot may not meet the requirements; and when the position of the projection spot after the laser assembly passes through the lens meets the requirements, the shape of the projection spot may not meet the requirements. In one embodiment of the present invention, since the base of the laser assembly is embedded in the second mounting hole of the sleeve by an interference fit, and the central symmetry axis of the base of the laser assembly is coaxially arranged with the central symmetry axis of the second mounting hole. When the laser assembly is installed in the sleeve, the laser assembly can be slowly pushed into the second mounting hole of the sleeve by linear motion, and the laser assembly is always powered on. During the advancement of the laser assembly, the most suitable installation position of the laser assembly can be determined by continuously detecting the shape of the projection spot after the laser assembly passes through the lens. That is, the position of the projected light spot of the laser component after passing through the lens is basically fixed, and the shape of the light spot can be adjusted only by adjusting the positional relationship between the laser component and the lens, thereby enhancing the reliability and consistency of the laser module product.

[0049] 4. In the conventional assembly process of the laser module, the lens is usually placed inside the sleeve first, and then the lens and the sleeve are fixed by a metal aluminum ring, and finally the lens is fixed inside the sleeve by dispensing glue. However, the above assembly process is relatively complicated. In addition, since the lens needs to be placed inside the sleeve first, the depth inside the sleeve is relatively deep, and the size of the lens is relatively small, the overall operation process will become more complicated, and it may be necessary to adjust the lens repeatedly several times to adjust the lens to the corresponding position. In one embodiment of the present invention, a lens fixing seat is provided, and a receiving hole is provided in the lens fixing seat. Since the receiving hole is directly provided on the surface of the lens fixing seat, the lens can be easily placed in the receiving hole of the lens fixing seat during the assembly process. After the position of the lens is adjusted, the lens can be fixed in the lens fixing seat by dispensing glue. After the lens is fixed to the lens fixing seat, the lens fixing seat can be pushed into the sleeve. Since the lens fixing seat is a whole and its volume is large, the lens fixing seat and the sleeve can be easily assembled during the assembly process. In other words, this method can better improve the assembly efficiency of the laser module.

[0050] 5. In one embodiment, the outer wall surface includes a first portion disposed near the first end, and a second portion disposed near the second end. The radius of the cross section of the first portion is greater than the radius of the cross section of the second portion. On the one hand, the radius of the cross section of the first portion of the outer wall surface is set larger, so that when the lens holder is installed in the sleeve, it can be fixed in the sleeve by interference fit. On the other hand, the radius of the cross section of the second portion of the outer wall surface is set smaller, so that when the lens holder is installed in the sleeve, a certain gap is formed between the second portion of the outer wall surface and the inner circumference of the mounting hole. At this time, the lens will not directly contact the sleeve in the lateral direction, thereby avoiding the stress on the sleeve from being directly transferred to the lens, thereby causing damage to the lens. Similarly, in one embodiment, the axial length of the second portion of the outer wall surface is greater than the depth of the accommodating hole. Since the lens is arranged in the accommodating hole, this arrangement can ensure that at the position where the lens is arranged on the lens holder, there is a certain gap between it and the inner circumference of the mounting hole, thereby again avoiding the stress on the sleeve from being directly transferred to the lens.

[0051] 6. In one embodiment, the central symmetry axis of the receiving hole is coaxial with the optical axis of the lens, and is parallel to the central symmetry axis of the outer wall and spaced apart by a preset distance. In this case, as long as the lens is assembled in the receiving hole of the lens fixing seat, the optical axis of the lens and the central symmetry axis of the outer wall can be spaced apart from each other.

[0052] 7. In one embodiment, the lens fixing seat includes a light-through hole and a receiving hole, and the light-through hole and the receiving hole are connected to each other. The light emitted by the laser assembly passes through the light-through hole and the lens of the receiving hole in turn and is emitted to the outside. On the one hand, since the aperture of the light-through hole is smaller than the aperture of the receiving hole, a step portion is formed at the connection between the receiving hole and the light-through hole. When the lens is installed in the receiving hole, one end of the lens abuts on the step portion. That is, the installation position of the lens can be limited by the step portion, thereby achieving accurate alignment of the installation position of the lens. On the other hand, since the central symmetry axis of the light-through hole and the central symmetry axis of the receiving hole are parallel to each other and separated by a preset distance, and the optical axis of the laser assembly coincides with the central symmetry axis of the light-through hole, the light emitted by the laser assembly will be deflected at a certain angle after passing through the lens.

[0053] 8. In one embodiment, the sleeve is made of metal material, and the lens holder is made of plastic material. On the one hand, the heat generated by the laser assembly during operation can be transferred to the external environment through the sleeve made of metal material, thereby facilitating the heat dissipation of the laser assembly. On the other hand, the lens holder is made of plastic material, and the lens holder can absorb the stress generated by the laser module during operation or transportation, thereby further improving the reliability of the laser assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0055] Figure 1 This is a schematic diagram of the axial structure of a laser module provided in one embodiment of the present invention.

[0056] Figure 2 A schematic cross-sectional structural diagram of a laser module provided in one embodiment of the present invention.

[0057] Figure 3 This is a schematic structural diagram of a lens fixing seat and a lens provided in one embodiment of the present invention.

[0058] Figure 4 A schematic structural diagram of a laser module provided in one embodiment of the present invention.

[0059] Figure 5 It is a comparison diagram of the projection spots of the laser module of the prior art and the laser module of the present invention, wherein part a of the figure is a schematic diagram of the projection spot of the laser module of the prior art, and part b of the figure is a schematic diagram of the projection spot of the laser module of the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0062] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] See also Figures 1 to 3 One embodiment of the present invention provides a lens assembly, comprising:

[0064] A lens fixing seat 100 having a receiving hole 110; and

[0065] The lens 200 is disposed in the receiving hole 110 of the lens fixing seat 100;

[0066] The optical axis of the lens 200 and the central symmetry axis of the outer wall of the lens fixing seat 100 are parallel to each other and separated by a preset distance.

[0067] Specifically, the lens fixing seat 100 is used to carry and fix the lens 200; when the lens assembly is used in a laser radar device, such as a laser radar of a sweeping robot, it is usually necessary to make the light emitted by the laser assembly 400 deflect at a specific angle after passing through the lens 200. Generally speaking, the optical axis of the lens 200 and the optical axis of the laser assembly are parallel to each other and separated by a preset distance, thereby producing the above-mentioned deflection effect to meet the needs of the actual application scenarios of the laser radar device.

[0068] Therefore, when used, the optical axis of the lens 200 and the central symmetry axis of the outer wall of the lens fixing seat 100 are parallel to each other and separated by the preset distance, so that the light emitted by the laser component 400 will be deflected at a specific angle after passing through the lens 200, thereby meeting the needs of the actual application scenarios of the laser radar device.

[0069] In one embodiment, the central symmetry axis of the receiving hole 110 of the lens fixing seat 100 is coaxially arranged with the optical axis of the lens 200; and

[0070] The central symmetric axis of the receiving hole 110 of the lens holder 100 and the central symmetric axis of the outer wall of the lens holder 100 are parallel to each other and spaced apart by the preset distance. That is, in this embodiment, the preset distance between the central symmetric axis of the receiving hole 110 of the lens holder 100 and the central symmetric axis of the outer wall of the lens holder 100 is the same as the preset distance between the optical axis of the lens 200 and the central symmetric axis of the outer wall of the lens holder 100.

[0071] Specifically, the receiving hole 110 of the lens holder 100 is used to receive the lens 200, so the central symmetry axis of the receiving hole 110 is coaxially arranged with the optical axis of the lens 200, and the central symmetry axis of the receiving hole 110 and the central symmetry axis of the outer wall are parallel to each other and spaced apart by the preset distance. At this time, since the preset distance between the central symmetry axis of the receiving hole 110 of the lens holder 100 and the central symmetry axis of the outer wall of the lens holder 100 is the same as the preset distance between the optical axis of the lens 200 and the central symmetry axis of the outer wall of the lens holder 100, the lens 200 can be assembled in the receiving hole of the lens holder 100 to achieve a structure in which the optical axis of the lens 200 and the central symmetry axis of the outer wall are spaced apart from each other.

[0072] In one embodiment, the lens fixing seat 100 further includes a light-through hole 120 , and the light-through hole 120 is connected to the receiving hole 110 ;

[0073] The aperture of the light-through hole 120 is smaller than that of the receiving hole 110, so as to form a step portion at the connection between the receiving hole 110 and the light-through hole 120, and one end of the lens 200 abuts against the step portion;

[0074] And / or, the central symmetry axis of the light-through hole 120 and the central symmetry axis of the receiving hole 110 are parallel to each other and separated by the preset distance;

[0075] And / or, the central symmetry axis of the light through hole 120 is coaxially arranged with the central symmetry axis of the outer wall surface 130 of the lens fixing seat 100 .

[0076] Specifically, the lens fixing seat 100 includes a light-through hole 120 and a receiving hole 110, and the light-through hole 120 and the receiving hole 110 are connected to each other. The light emitted by the laser assembly 400 passes through the light-through hole 120 and the lens 200 of the receiving hole 110 in turn and is emitted to the outside. On the one hand, since the aperture of the light-through hole 120 is smaller than the aperture of the receiving hole 110, a step portion is formed at the connection between the receiving hole 110 and the light-through hole 120. When the lens 200 is installed in the receiving hole 110, one end of the lens 200 abuts against the step portion. That is, the installation position of the lens 200 can be limited by the step portion, thereby achieving accurate alignment of the installation position of the lens 200. On the other hand, since the central symmetry axis of the light hole 120 and the central symmetry axis of the receiving hole 110 are parallel to each other and separated by a preset distance, and the optical axis of the laser component 400 coincides with the central symmetry axis of the light hole 120, the light emitted by the laser component 400 will be deflected at a certain angle after passing through the lens 200.

[0077] In one embodiment, the lens holder 100 includes a first end and a second end, wherein the first end of the lens holder 100 is used to receive light input; and the second end of the lens holder 100 is used to output light;

[0078] The receiving hole 110 is disposed at the second end of the lens fixing seat 100 .

[0079] Specifically, since the receiving hole 110 is directly disposed at the second end of the surface of the lens holder 100, during the assembly process, the lens 200 can be easily placed in the receiving hole 110 of the lens holder 100. After the position of the lens 200 is adjusted, the lens 200 can be fixed in the lens holder 100 by dispensing glue.

[0080] In one embodiment, the outer wall surface 130 of the lens fixing seat 100 includes a first portion and a second portion, the first portion of the outer wall surface 130 is disposed close to the first end, the second portion of the outer wall surface 130 is disposed close to the second end, and the cross-sectional radius of the second portion of the outer wall surface 130 perpendicular to the central axis of symmetry is smaller than the cross-sectional radius of the first portion of the outer wall surface 130 perpendicular to the central axis of symmetry.

[0081] Specifically, the outer wall surface 130 includes a first portion disposed near the first end and a second portion disposed near the second end. The radius of the cross section of the first portion is greater than the radius of the cross section of the second portion. On the one hand, the radius of the cross section of the first portion of the outer wall surface 130 is set larger, so that when the lens holder 100 is installed in the sleeve 300, it can be fixed in the sleeve 300 by interference fit.

[0082] In one embodiment, the cross-sectional radius of the second portion of the outer wall surface 130 perpendicular to the central symmetry axis gradually decreases in a direction approaching the second end surface.

[0083] Specifically, the radius of the cross section of the second portion of the outer wall surface 130 is set to gradually decrease in the direction close to the second end surface, and when the lens holder 100 is installed in the sleeve 300, a certain gap is formed between the second portion of the outer wall surface 130 and the inner circumference of the installation hole 310. At this time, the lens 200 will not directly contact the sleeve 300 in the lateral direction, thereby avoiding the stress on the sleeve 300 being directly transferred to the lens 200, thereby causing damage to the lens 200.

[0084] In one embodiment, the axial length of the second portion of the outer wall surface 130 is greater than the depth of the receiving hole 110 .

[0085] Specifically, the axial length of the second portion of the outer wall surface 130 is greater than the depth of the accommodating hole 110. Since the lens 200 is disposed in the accommodating hole 110, this arrangement can ensure that there is a certain gap between the position of the lens fixing seat 100 where the lens 200 is disposed and the inner circumference of the mounting hole 310, thereby preventing the stress on the sleeve 300 from being directly transferred to the lens 200.

[0086] In one embodiment, the deviation distance between the optical axis of the lens 200 and the central symmetry axis of the outer wall surface 130 of the lens fixing seat 100 is in the range of 0.07 mm to 0.13 mm.

[0087] One embodiment of the present invention further provides a lens module, comprising:

[0088] Sleeve 300; and

[0089] The lens assembly as described in any one of the above embodiments is arranged inside the sleeve 300 .

[0090] Specifically, a lens holder 100 is provided, and a receiving hole 110 is provided in the lens holder 100. Since the receiving hole 110 is directly provided on the surface of the lens holder 100, the lens 200 can be easily placed in the receiving hole 110 of the lens holder 100 during the assembly process. After the position of the lens 200 is adjusted, the lens 200 can be fixed in the lens holder 100 by dispensing glue. After the lens 200 is fixed to the lens holder 100, the lens holder 100 can be pushed into the sleeve 300. Since the lens holder 100 is a whole and has a large volume, the lens holder 100 and the sleeve 300 can be easily assembled during the assembly process. In other words, this method can better improve the assembly efficiency of the laser module.

[0091] Furthermore, in conventional laser modules, the lens 200 is usually in direct contact with the sleeve 300. During the assembly process, the lens 200 is directly pressed against the sleeve 300, which makes the lens 200 easily damaged. In addition, the contact stress between the lens 200 and the sleeve 300 may cause the lens 200 to be easily broken due to falling or collision during the subsequent transportation or use. In the embodiment of the present invention, by setting the lens 200 in the receiving hole 110 of the lens fixing seat 100, when the lens 200 assembly is assembled into the sleeve 300 of the lens 200 module, the lens fixing seat 100 can protect the lens 200, thereby avoiding direct contact between the lens 200 and the sleeve 300. At this time, the stress generated during transportation or use is not easily transmitted directly to the lens 200 through the sleeve 300, thereby avoiding the situation where the lens 200 is broken.

[0092] In one embodiment, the sleeve 300 includes:

[0093] Mounting hole 310;

[0094] light exit hole 320; and

[0095] A positioning portion 330, wherein the positioning portion 330 is disposed between the mounting hole 310 and the light exit hole 320, and the lens 200 assembly is disposed in the mounting hole 310;

[0096] The lens fixing seat 100 includes a first end and a second end. The second end of the lens fixing seat 100 is disposed against the positioning portion 330 , and the first end of the lens fixing seat 100 is disposed away from the positioning portion 330 .

[0097] Specifically, the positioning portion 330 is used to limit the position of the lens 200 mounting seat, and the second end on which the lens 200 is mounted abuts against the positioning portion 330. The light beam incident from the first end is deflected by the lens 200 in the lens 200 mounting seat and then emitted from the second end and enters the light exit hole 320.

[0098] In one embodiment, the outer wall surface 130 of the lens fixing seat 100 includes a first part and a second part, the first part of the outer wall surface 130 is arranged close to the first end, and the second part of the outer wall surface 130 is arranged close to the second end, the cross-sectional radius of the first part of the outer wall surface 130 perpendicular to the central axis of symmetry is greater than the cross-sectional radius of the mounting hole 310 perpendicular to the central axis of symmetry, the cross-sectional radius of a part of the second part of the outer wall surface 130 close to the second end perpendicular to the central axis of symmetry is smaller than the cross-sectional radius of the mounting hole 310 perpendicular to the central axis of symmetry, the cross-sectional radius of a part of the second part of the outer wall surface 130 away from the second end perpendicular to the central axis of symmetry is greater than the cross-sectional radius of the mounting hole 310 perpendicular to the central axis of symmetry, and the second part of the outer wall surface 130 of the lens fixing seat 100 is interference fit with the mounting hole 310.

[0099] Specifically, when the second portion of the outer wall surface 130 of the lens fixing seat 100 is interference fit with the mounting hole 310, a gap is formed between a portion of the second portion of the outer wall surface 130 whose cross-sectional radius is smaller than the cross-sectional radius of the mounting hole 310 and the inner circumferential surface of the mounting hole 310, thereby again avoiding the stress on the sleeve 300 from being directly transferred to the lens 200.

[0100] In one embodiment, the mounting hole 310 includes a first mounting hole 311 and a second mounting hole 312;

[0101] The first mounting hole 311 is disposed at one end close to the positioning portion 330 , and the first mounting hole 311 is used to accommodate the lens 200 assembly;

[0102] The second mounting hole 312 is disposed at an end away from the positioning portion 330 , and the second mounting hole 312 is used to accommodate the laser assembly 400 .

[0103] Specifically, the laser assembly 400 located in the second mounting hole 312 generates a laser beam that is directed toward the lens 200 assembly in the first mounting hole 311. The laser beam enters from the light hole 120 of the lens 200 assembly and passes through the lens 200 in the lens 200 assembly that is not coaxial with the lens 200 mounting seat, thereby being deflected.

[0104] In one embodiment, the central symmetric axis of the outer circumference of the sleeve 300, the central symmetric axis of the inner circumference of the mounting hole 310, and the central symmetric axis of the inner circumference of the light exit hole 320 are coaxially arranged;

[0105] The central symmetric axis of the outer wall surface 130 of the lens fixing seat 100 is coaxially arranged with the central symmetric axis of the inner circumferential surface of the mounting hole 310 .

[0106] Specifically, the central symmetry axis of the outer circumferential surface of the sleeve 300, the central symmetry axis of the inner circumferential surface of the mounting hole 310, and the central symmetry axis of the inner circumferential surface of the light exit hole 320 are coaxially arranged, and multiple positioning is not required when processing the sleeve 300, thereby reducing the positioning deviation of the processing; and the central symmetry axis of the outer wall surface 130 of the lens fixing seat 100 is coaxially arranged with the central symmetry axis of the inner circumferential surface of the mounting hole 310. When the lens fixing seat 100 is installed in the mounting hole 310, the angle of the lens fixing seat 100 can be rotated to adjust the angle of the lens fixing seat 100, so that the light beam emitted from the lens fixing seat 100 and deflected by the lens 200 is emitted from the light exit hole 320 at a limited position.

[0107] In one embodiment, the sleeve 300 is an integrated structure;

[0108] And / or, the sleeve 300 is made of a heat-conducting material, and the strength of the sleeve 300 is greater than the strength of the lens fixing seat 100 .

[0109] Specifically, the heat generated by the laser component 400 during operation will affect the operation of the laser component 400 when the heat reaches a certain level. Therefore, the sleeve 300 made of heat-conductive material can transfer the heat generated by the laser component 400 during operation to the external environment to prevent overheating; and the strength of the sleeve 300 is greater than the strength of the lens fixing seat 100, which can ensure that the sleeve 300 does not deform during the installation of the lens fixing seat 100 by interference fit.

[0110] In one embodiment, the sleeve 300 is made of metal material, and the lens fixing seat 100 is made of plastic material.

[0111] Specifically, the sleeve 300 is made of metal material, and the lens holder 100 is made of plastic material. On the one hand, through the sleeve 300 made of metal material, the heat generated by the laser assembly 400 during operation can be transferred to the external environment through the sleeve 300, thereby facilitating the heat dissipation of the laser assembly 400. On the other hand, through the lens holder 100 made of plastic material, the lens holder 100 can absorb the stress generated by the laser module during operation or transportation, thereby further improving the reliability of the laser assembly 400.

[0112] Furthermore, the lens 200 is installed in the lens holder 100, and the lens holder 100 is made by injection molding. On the one hand, the lens holder 100 made by injection molding forms the lens holder 100 and the receiving hole 110 for installing the lens 200 at one time, and the central axis of the receiving hole 110 is parallel to the central symmetric axis of the lens holder 100 and is separated by a preset distance, so that the optical axis deviation accuracy of the lens 200 is relatively high, so that the deflection angle generated by the light emitted by the laser assembly 400 after passing through the lens 200 is more accurate. On the other hand, the lens holder 100 made by injection molding eliminates the process of making a through hole with an eccentric axis on the metal sleeve 300, thereby saving the manufacturing cost of the laser module.

[0113] One embodiment of the present invention further provides a laser module, comprising:

[0114] The lens 200 module as described in any one of the above embodiments; and

[0115] The laser assembly 400 is disposed inside the sleeve 300. The light emitted by the laser assembly 400 passes through the lens 200 inside the lens 200 assembly and then exits the lens 200 module. The optical axis of the laser assembly 400 is parallel to the optical axis of the lens 200 and is spaced apart by a preset distance.

[0116] Specifically, the optical axis of the laser component 400 is parallel to the optical axis of the lens 200 and separated by a preset distance, so that the light emitted by the laser component 400 will be deflected at a specific angle after passing through the lens 200, thereby meeting the needs of actual application scenarios.

[0117] In one embodiment, the lens holder 100 includes a first end and a second end. The sleeve 300 includes a mounting hole 310, a light exit hole 320, and a positioning portion 330. The positioning portion 330 is disposed between the mounting hole 310 and the light exit hole 320. The second end of the lens holder 100 is disposed against the positioning portion 330, and the first end of the lens holder 100 is disposed close to the laser assembly 400.

[0118] Specifically, the light beam emitted by the laser assembly 400 is injected from the first end of the lens fixing seat 100, and then emitted from the second end of the lens fixing seat 100. In the process of the light beam from the first end to the second end, it forms a certain deflection angle after passing through the lens 200, and then passes through the positioning part 330 and is emitted along the light output hole 320.

[0119] In one embodiment, the mounting hole 310 includes a first mounting hole 311 and a second mounting hole 312, the first mounting hole 311 is arranged at an end close to the positioning portion 330, and the second mounting hole 312 is arranged at an end away from the positioning portion 330, the first mounting hole 311, the second mounting hole 312 and the light exit hole 320 are connected, the second mounting hole 312 and the light exit hole 320 are respectively located at two ends of the first mounting hole 311, the lens 200 assembly is arranged in the first mounting hole 311, the laser assembly 400 is arranged in the second mounting hole 312, and the optical axis of the laser assembly 400 is coaxially arranged with the central symmetry axis of the second mounting hole 312.

[0120] Specifically, the optical axis of the laser assembly 400 is coaxially arranged with the central symmetric axis of the second mounting hole 312. When the laser assembly 400 is installed in the sleeve 300, the laser assembly 400 can be slowly pushed into the second mounting hole 312 of the sleeve 300 by linear motion, and the most suitable installation position of the laser assembly 400 can be determined. That is, the position of the projected light spot of the laser assembly 400 after passing through the lens 200 assembly is basically fixed.

[0121] In one embodiment, the laser assembly 400 includes a base and a light source arranged on the base, the base of the laser assembly 400 is embedded in the second mounting hole 312 of the sleeve 300, and the central symmetry axis of the base of the laser assembly 400 is coaxially arranged with the central symmetry axis of the second mounting hole 312.

[0122] Specifically, since the base of the laser assembly 400 is embedded in the second mounting hole 312 of the sleeve 300 by interference fit, and the central symmetric axis of the base of the laser assembly 400 is coaxially arranged with the central symmetric axis of the second mounting hole 312. When the laser assembly 400 is installed in the sleeve 300, the laser assembly 400 can be slowly pushed into the second mounting hole 312 of the sleeve 300 by linear motion, and the laser assembly 400 is always powered on. During the advancement of the laser assembly 400, the most suitable installation position of the laser assembly 400 can be determined by continuously detecting the shape of the projected light spot after the laser assembly 400 passes through the lens 200. That is, the position of the projected light spot after the laser assembly 400 passes through the lens 200 is basically fixed, and the adjustment of the light spot shape can be achieved only by adjusting the positional relationship between the laser assembly 400 and the lens 200, thereby enhancing the reliability and consistency of the laser module product.

[0123] In one embodiment, the laser module is a laser emission module.

[0124] One of the embodiments of the present invention further provides a laser radar device, comprising a laser module as described in any of the above embodiments.

[0125] like Figure 4 , Figure 5 In the structure shown, when the laser radar device is used in a sweeping robot, it is usually necessary to make the light emitted by the laser component 400 deflect at a specific angle after passing through the lens 200. Generally speaking, the optical axis of the lens 200 and the optical axis of the laser component 400 are parallel to each other and separated by a preset distance, thereby producing the above-mentioned deflection effect and meeting the needs of the actual application scenarios of the laser radar device. In a conventional laser module, the lens 200 is usually in direct contact with the sleeve 300, and the sleeve 300 is usually made of metal. At this time, it is necessary to machine the lens 200 mounting hole 310 with an eccentric axis on the sleeve 300 by mechanical processing. On the one hand, a lens 200 mounting hole 310 is processed in the metal sleeve 300, and the central symmetric axis of the lens 200 mounting hole 310 is parallel to the central symmetric axis of the sleeve 300 and is spaced by a preset distance, and the central symmetric axis of the light source mounting hole 310 is coaxial with the central symmetric axis of the sleeve 300. It is necessary to perform multiple processes on the sleeve 300 to form the lens 200 mounting hole 310 and the light source assembly mounting hole 310 of different axes, and each of the above-mentioned processes requires the use of different fixtures and repositioning, which easily leads to processing positioning deviations, and thus it is difficult to ensure the offset distance accuracy of the central symmetric axis of the manufactured lens 200 mounting hole 310, resulting in the projected light spot position deviating from the specified range, such as Figure 5 As shown in part a in the figure. On the other hand, processing the lens 200 mounting hole 310 and the light source assembly mounting hole 310 of different axes on the sleeve 300 requires more processes and different fixtures, so the processing cost is also high. In the embodiment of the present invention, the lens 200 is installed in the lens fixing seat 100, and the lens fixing seat 100 is made by injection molding. On the one hand, the lens fixing seat 100 made by injection molding forms the lens fixing seat 100 and the accommodating hole 110 for installing the lens 200 at one time, wherein the central axis of the accommodating hole 110 is parallel to the central symmetry axis of the lens fixing seat 100 and is spaced by a preset distance, so that the optical axis deviation accuracy of the lens 200 is relatively high, so that the deflection angle of the light emitted by the laser assembly 400 after passing through the lens 200 is more accurate, so that the light spot falls within a limited range, as shown in FIG. Figure 5 On the other hand, the lens holder 100 made by injection molding saves the process of making a through hole with an eccentric shaft on the metal sleeve 300, thereby saving the manufacturing cost of the laser module.

[0126] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lens module, characterized in that: include: Sleeve; as well as A lens assembly is arranged inside the sleeve; The lens assembly comprises: A lens fixing seat, wherein the lens fixing seat has a receiving hole; and A lens is arranged in the receiving hole of the lens fixing seat; The optical axis of the lens and the central symmetry axis of the outer wall of the lens holder are parallel to each other and separated by a preset distance; the central symmetry axis of the receiving hole of the lens holder is coaxially arranged with the optical axis of the lens; and the central symmetry axis of the receiving hole of the lens holder is parallel to the central symmetry axis of the outer wall of the lens holder and separated by the preset distance; The sleeve is an integrated structure, the sleeve is made of metal material, and the strength of the sleeve is greater than the strength of the lens fixing seat, and the lens fixing seat is made of plastic material.

2. The lens module according to claim 1, characterized in that: The lens fixing seat further comprises a light-through hole, and the light-through hole is connected to the accommodating hole; The aperture of the light-through hole is smaller than the aperture of the receiving hole, so that a step portion is formed at the connection between the receiving hole and the light-through hole, and one end of the lens abuts against the step portion; And / or, the central symmetry axis of the light-through hole and the central symmetry axis of the receiving hole are parallel to each other and are separated by the preset distance; And / or, the central symmetry axis of the light through hole is coaxially arranged with the central symmetry axis of the outer wall surface of the lens fixing seat.

3. The preset distance between the optical axis of the lens and the central symmetry axis of the outer wall of the lens fixing seat is 0.07 mm to 0.13 mm.

4. The lens module according to any one of claims 1 to 3, characterized in that: The sleeve comprises: Mounting holes; light exit hole; and A positioning portion, the positioning portion is arranged between the mounting hole and the light exit hole, and the lens assembly is arranged in the mounting hole; The lens fixing seat comprises a first end and a second end, the second end of the lens fixing seat is arranged to abut against the positioning portion, and the first end of the lens fixing seat is arranged away from the positioning portion.

5. The lens module according to claim 4, characterized in that: The mounting holes include a first mounting hole and a second mounting hole, wherein the first mounting hole is arranged at an end close to the positioning portion and is used to accommodate the lens assembly, and the second mounting hole is arranged at an end away from the positioning portion and is used to accommodate the laser assembly.

6. The lens module according to claim 4, characterized in that: The central symmetric axis of the outer circumference of the sleeve, the central symmetric axis of the inner circumference of the mounting hole, the central symmetric axis of the inner circumference of the light exit hole and the central symmetric axis of the outer wall of the lens fixing seat are coaxially arranged.

7. A laser module, characterized in that: include: The lens module according to any one of claims 1 to 6; as well as The laser assembly is arranged inside the sleeve. The light emitted by the laser assembly passes through the lens inside the lens assembly and then exits the lens module. The optical axis of the laser assembly and the optical axis of the lens are parallel to each other and spaced by the preset distance.

8. A laser radar device, characterized in that: Comprising the laser module as claimed in claim 7.

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