CN114252864A - Lens assembly, lens module, laser module and laser radar device - Google Patents
Lens assembly, lens module, laser module and laser radar device Download PDFInfo
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- CN114252864A CN114252864A CN202111550938.7A CN202111550938A CN114252864A CN 114252864 A CN114252864 A CN 114252864A CN 202111550938 A CN202111550938 A CN 202111550938A CN 114252864 A CN114252864 A CN 114252864A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- Semiconductor Lasers (AREA)
Abstract
The invention provides a lens assembly, a lens module, a laser module and a laser radar device. The lens assembly comprises a lens fixing seat and a lens. The lens fixing seat is provided with a containing hole. The lens is arranged in the accommodating 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 are spaced by a preset distance. Through being parallel to each other and the interval with the central symmetry axle of lens fixing base and lens predetermine the distance, work as when the laser radar device of robot sweeps floor is used to the lens subassembly, it can make the light that laser assembly sent carry out certain angle's deflection to satisfy its practical application's demand.
Description
Technical Field
The invention belongs to the technical field of laser, and particularly relates to a lens assembly, a lens module, a laser module and a laser radar device.
Background
The 2009 Neato company issued a laser radar for a robot, which measures a distance to an obstacle by using a triangulation method between a laser transmitter and a receiver, and a laser ranging sensor was mounted on a motor, measures a distance within a 360 ° circle by rotation, and draws an indoor map based on the distance. The laser transmitter is one of the core components of the lidar. In a conventional application scenario, in order to adjust the focal length of the laser transmitter and thus adjust the position and shape of the projected light spot generated by the laser transmitter to meet the standard, the laser transmitter is usually configured in a two-segment structure. The optical lens is positioned at one section, the laser assembly is positioned at the other section, and the two-section structure is connected through threads, so that the function of adjusting the position of the laser assembly is realized. However, in the process of adjusting the focal length in a threaded manner, due to the influence of threaded connection precision, the position of the projection light spot generated by the focal length adjusting device is usually not fixed at the same position, but can move within a certain range, which undoubtedly affects the consistency of the product and easily improves the reject ratio of the laser emitter.
Disclosure of Invention
In order to overcome the defects of the prior art, the embodiment of the invention provides a lens assembly, a lens module, a laser module and a laser radar device, so as to solve the problems of high reject ratio and poor consistency of the laser module in the prior art.
One embodiment of the present invention provides a lens assembly, comprising:
the lens fixing seat is provided with a containing hole; and
the lens is arranged in the accommodating 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 are spaced by a preset distance.
In one embodiment, a central symmetry axis of the accommodating hole of the lens fixing seat is coaxial with an optical axis of the lens; and
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 are spaced by the preset distance.
In one embodiment, the lens fixing seat further comprises a light through hole, and the light through hole is communicated with the accommodating hole;
the aperture of the light through hole is smaller than that of the accommodating hole so as to form a step part at the joint of the accommodating hole and the light through hole, and one end of the lens is abutted against the step part;
and/or the central symmetry axis of the light through hole and the central symmetry axis of the containing 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 coaxial with the central symmetry axis of the outer wall surface of the lens fixing seat.
In one embodiment, the lens holder comprises a first end and a second end, and the first end of the lens holder is used for receiving light input; the second end of the lens fixing seat is used for outputting light;
the accommodating hole is formed in the second end of the lens fixing seat.
In one embodiment, the outer wall surface of the lens holder includes a first portion and a second portion, the first portion of the outer wall surface is disposed near the first end, the second portion of the outer wall surface is disposed near the second end, and a cross-sectional radius of the second portion of the outer wall surface perpendicular to the central symmetry axis is smaller than a cross-sectional radius of the first portion of the outer wall surface perpendicular to the central symmetry axis.
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.
In one embodiment, the axial length of the second portion of the outer wall surface is greater than the depth of the receiving hole.
In one embodiment, the offset distance between the optical axis of the lens and the central symmetry axis of the outer wall surface of the lens fixing seat is within the range of 0.07mm to 0.13 mm.
One embodiment of the present invention provides a lens module, including:
a sleeve; and
the lens assembly of any of the above embodiments, disposed inside the sleeve.
In one embodiment, the sleeve comprises:
mounting holes;
a light exit hole; and
the positioning part is arranged between the mounting hole and the light outlet 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 abutted to the positioning portion, and the first end of the lens fixing seat is far away from the positioning portion.
In one embodiment, the outer wall surface of the lens holder includes a first portion and a second portion, the first portion of the outer wall surface is disposed near the first end, the second portion of the outer wall surface is disposed near the second end, a cross-sectional radius of the first portion of the outer wall surface perpendicular to the central symmetry axis is greater than a cross-sectional radius of the mounting hole perpendicular to the central symmetry axis, a cross-sectional radius of a portion of the second portion of the outer wall surface near the second end perpendicular to the central symmetry axis is smaller than a cross-sectional radius of the mounting hole perpendicular to the central symmetry axis, a cross-sectional radius of a portion of the second portion of the outer wall surface far from the second end perpendicular to the central symmetry axis is greater than a cross-sectional radius of the mounting hole perpendicular to the central symmetry axis, and the second portion of the outer wall surface of the lens holder is in interference fit with the mounting hole.
In one embodiment, the mounting holes comprise a first mounting hole and a second mounting hole;
the first mounting hole is arranged at one end close to the positioning part and used for accommodating the lens assembly;
the second mounting hole is formed in one end, far away from the positioning portion, of the second mounting hole, and the second mounting hole is used for containing the laser assembly.
In one embodiment, a central symmetry axis of the outer circumferential surface of the sleeve, a central symmetry axis of the inner circumferential surface of the mounting hole and a central symmetry axis of the inner circumferential surface of the light outlet hole are coaxially arranged;
the central symmetry axis of the outer wall surface of the lens fixing seat and the central symmetry axis of the inner circumferential surface of the mounting hole are coaxially arranged.
In one embodiment, the sleeve is a one-piece structure;
and/or the sleeve is made of heat conducting materials, and the strength of the sleeve is greater than that of the lens fixing seat.
In one embodiment, the sleeve is made of a metal material, and the lens holder is made of a plastic material.
One embodiment of the present invention provides a laser module, including:
the lens module of any of the above embodiments; and
the laser assembly is arranged inside the sleeve, light emitted by the laser assembly passes through the lens inside the lens assembly and then is emitted out of the lens module, and the optical axis of the laser assembly is parallel to the optical axis of the lens and is spaced from the optical axis of the lens by the preset distance.
In one embodiment, the lens holder includes a first end and a second end, and the sleeve includes a mounting hole and a light-emitting hole; and the positioning part is arranged between the mounting hole and the light emitting hole, the second end of the lens fixing seat is abutted to the positioning part, and the first end of the lens fixing seat is close to the laser assembly.
In one embodiment, the mounting holes include a first mounting hole and a second mounting hole, the first mounting hole is disposed at an end close to the positioning portion, the second mounting hole is disposed at an end away from the positioning portion, the first mounting hole, the second mounting hole and the light emitting hole are communicated, the second mounting hole and the light emitting hole are respectively located at two ends of the first mounting hole, the lens assembly is disposed in the first mounting hole, the laser assembly is disposed in the second mounting hole, and an optical axis of the laser assembly and a central symmetry axis of the second mounting hole are coaxially disposed.
In one embodiment, the laser assembly includes a base and a light source disposed on the base, the base of the laser assembly is embedded into the second mounting hole of the sleeve, a central symmetry axis of the base of the laser assembly is disposed coaxially with a central symmetry axis of the second mounting hole, and a central symmetry axis of the outer wall surface of the lens fixing seat is disposed coaxially with a central symmetry axis of the first mounting hole.
In one embodiment, the laser module is a laser emitting module.
An embodiment of the present invention further provides a laser radar apparatus, including the laser module according to any one of the above embodiments.
The lens subassembly, lens module, laser module or the laser radar device that the embodiment provided above have following beneficial effect:
1. in a conventional laser module, the lens usually directly contacts with the sleeve, and during the assembly process, the lens directly presses against the sleeve, so that the lens is easily damaged, and in addition, the contact stress between the lens and the sleeve can cause the lens to be easily cracked due to dropping or collision and other conditions during subsequent transportation or use. In the embodiment of the invention, the lens is arranged in the accommodating hole of the lens fixing seat, and when the lens assembly is assembled in the sleeve of the lens module, the lens fixing seat can protect the lens, so that the lens is prevented from being in direct contact with the sleeve. At this time, the stress generated during the transportation or use process is not easy to be directly transmitted to the lens through the sleeve, thereby avoiding the situation of lens fragmentation.
2. When the lens subassembly is used in the laser radar device, for example when sweeping floor the laser radar of robot, need make the light that laser unit sent usually pass through can produce the deflection of specific angle behind the lens, generally speaking, the optical axis of lens and laser unit's optical axis are parallel to each other and the interval predetermines the distance to produce above-mentioned deflection effect, satisfy the demand of laser radar device's practical application scene. In a conventional laser module, the lens is usually in direct contact with the sleeve, which is usually made of metal. At this time, the sleeve needs to be machined with a lens mounting hole having an eccentric shaft. On the one hand, lens mounting hole and light source mounting hole are processed in metal sleeve, wherein, the central symmetry axis of lens mounting hole and telescopic central symmetry axis are parallel to each other and the interval is predetermine the distance, the central symmetry axis of light source mounting hole is coaxial with telescopic central symmetry axis, consequently need a plurality of processes to carry out processing many times respectively to the sleeve just can form the lens mounting hole and the light source subassembly mounting hole of disalignment, and above-mentioned processing at every turn will adopt different anchor clamps and relocate, this just leads to processing positioning deviation easily, and then is difficult to guarantee the skew distance precision of the central symmetry axis of making the lens mounting hole. On the other hand, the sleeve is provided with the lens mounting hole and the light source assembly mounting hole which are not coaxial, so that more processes are required and different clamps are required, and therefore, the processing cost is higher. In the embodiment of the invention, the lens is installed in the lens fixing seat, and the lens fixing seat is manufactured by injection molding. On the one hand, through the lens fixing base of the mode preparation of moulding plastics, disposable lens fixing base and the holding hole that is used for installing the lens that form, the central axis in holding hole and the central symmetry axis of lens fixing base are parallel to each other and the interval predetermines the distance to the skew precision of optical axis of lens is than higher, thereby makes the light that laser unit sent pass through produced deflection angle behind the lens is more accurate. On the other hand, the lens fixing seat is manufactured by injection molding, so that the process of manufacturing a through hole with an eccentric shaft on the metal sleeve is omitted, and the manufacturing cost of the laser module can be saved.
3. In a conventional laser module, the distance between the laser assembly and the lens is adjusted by means of a threaded connection. However, since the threaded connection has a certain matching error, this matching error may further affect the position of the projected spot of the laser assembly after passing through the lens. That is, when the shape of the projected light spot of the laser assembly passing through the lens meets the requirement, the position of the projected light spot may not meet the requirement; when the position of the projected light spot of the laser assembly passing through the lens meets the requirement, the shape of the projected light spot may not meet the requirement. In one embodiment of the present invention, the base of the laser assembly is inserted into the second mounting hole of the sleeve by an interference fit, and the central symmetry axis of the base of the laser assembly is coaxial 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 installation hole of the sleeve in a linear motion mode, and meanwhile the laser assembly is always kept in an electrified state. During the advancing process of the laser assembly, the most appropriate installation position of the laser assembly can be determined by continuously detecting the form of the projected light spot of the laser assembly after passing through the lens. Namely, the position of the projected light spot of the laser component behind the lens is basically fixed, and the adjustment of the light spot form can be realized only by adjusting the position relation between the laser component and the lens, so that the reliability and the consistency of the laser module product are enhanced.
4. In the assembling process of the conventional laser module, the lens is usually placed inside the sleeve, then the lens and the sleeve are fixed through a metal aluminum ring, and finally the lens is fixed inside the sleeve through dispensing. However, the above-described assembly process is complicated. In addition, since the lens is required to be placed into the sleeve, the depth of the sleeve is deep, and the size of the lens is small, the overall operation process becomes complicated, and the lens may need to be adjusted several times to adjust the lens to the corresponding position. In one embodiment of the present invention, a lens holder is provided, and a receiving hole is provided in the lens holder. Because the accommodating holes are directly arranged on the surface of the lens fixing seat, the lens can be easily placed in the accommodating holes of the lens fixing seat in the assembling process. After the position of the lens is adjusted, the lens can be fixed in the lens fixing seat through dispensing. After the lens is fixed to the lens holder, the lens holder can be pushed into the sleeve. Because the lens fixing seat is a whole and has larger volume, the lens fixing seat and the sleeve can be easily assembled in the assembling process. That is to say, the method can better improve the assembly efficiency of the laser module.
5. In one embodiment, the outer wall surface includes a first portion disposed proximate the first end and a second portion disposed proximate 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 part of the outer wall surface is set to be larger, and when the lens holder is mounted in the sleeve, it can be fixed in the sleeve by means of interference fit. On the other hand, the radius of the cross section of the second portion of the outer wall surface is set to be small, and when the lens holder is mounted in the sleeve, a certain gap is formed between the second portion of the outer wall surface and the inner peripheral surface of the mounting hole. At this time, the lens will not directly contact with the sleeve in the transverse direction, so that the stress on the sleeve is prevented from being directly transmitted to the lens, and the lens is prevented from being damaged. Similarly, in one embodiment, the axial length of the second portion of the outer wall surface is greater than the depth of the receiving bore. Because the lens sets up in the holding hole, this kind of mode of setting can guarantee on the position that is provided with the lens of lens fixing base, its and the inner peripheral surface of mounting hole have certain clearance to avoid stress direct transfer to the lens on the sleeve once more.
6. In one embodiment, the central symmetry axis of the accommodating hole is coaxial with the optical axis of the lens, and is parallel to and spaced from the central symmetry axis of the outer wall surface by a preset distance. At this time, the lens can be assembled in the accommodating hole of the lens fixing seat, and the structure that the optical axis of the lens and the central symmetry axis of the outer wall surface are spaced from each other can be realized.
7. In one embodiment, the lens fixing seat comprises a light through hole and a containing hole, and the light through hole is communicated with the containing hole. The light emitted by the laser component sequentially passes through the light through hole and the lens of the accommodating hole and is emitted to the outside. On one hand, the aperture of the light through hole is smaller than that of the accommodating hole, so that a step part is formed at the joint of the accommodating hole and the light through hole. When the lens is installed in the accommodating hole, one end of the lens abuts against the step part. Namely, the installation position of the lens can be limited through the step part, so that the accurate alignment of the installation position of the lens is realized. On the other hand, because the central symmetry axis of the light through hole and the central symmetry axis of the accommodating hole are parallel to each other and are spaced 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 can be deflected at a certain angle after passing through the lens.
8. In one embodiment, the sleeve is made of a metal material, and the lens holder is made of a plastic material. On one hand, the sleeve made of metal materials can transfer heat generated by the laser assembly in the working process to the external environment through the sleeve, so that the heat dissipation of the laser assembly is facilitated. On the other hand, through the lens fixing base that the plastic material was made, the stress that the laser module produced in work or transportation can be absorbed to the lens fixing base to further promoted laser subassembly's reliability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic axial view of a laser module according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional structural diagram of a laser module according to an embodiment of the invention.
Fig. 3 is a schematic structural view of a lens holder and a lens according to an embodiment of the invention.
Fig. 4 is a schematic structural diagram of a laser module according to an embodiment of the present invention.
Fig. 5 is a comparison diagram of projection light spots of a laser module of the prior art and a laser module of the present invention, wherein a portion of the diagram is a schematic diagram of the projection light spots of the laser module of the prior art, and a portion of the diagram b is a schematic diagram of the projection light spots of the laser module of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture, and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, if the meaning of "and/or" and/or "appears throughout, the meaning includes three parallel schemes, for example," A and/or B "includes scheme A, or scheme B, or a scheme satisfying both schemes A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1 to 3, an embodiment of the invention provides a lens assembly, including:
a lens holder 100, the lens holder 100 having a receiving hole 110; and
a lens 200 disposed in the accommodation hole 110 of the lens holder 100;
the optical axis of the lens 200 is parallel to the central symmetry axis of the outer wall of the lens holder 100 and spaced by a predetermined distance.
Specifically, the lens holder 100 is used for carrying and fixing the lens 200; when the lens assembly is applied to a laser radar device, for example, a sweeping robot, light emitted by the laser assembly 400 generally needs to pass through the lens 200 to generate deflection at a specific angle, and generally, the optical axis of the lens 200 is parallel to the optical axis of the laser assembly at a preset interval, so that the deflection effect is generated, and the requirement of the actual application scene of the laser radar device is met.
Therefore, when in use, the optical axis of the lens 200 is parallel to the central symmetry axis of the outer wall surface of the lens holder 100 and is spaced by the preset distance, so that the light emitted by the laser assembly 400 can be deflected at a specific angle after passing through the lens 200, thereby meeting the requirements of the actual application scene of the laser radar device.
In one embodiment, the central symmetry axis of the receiving hole 110 of the lens holder 100 is coaxially disposed with the optical axis of the lens 200; and
the central symmetry axis of the accommodating hole 110 of the lens holder 100 is parallel to the central symmetry axis of the outer wall surface of the lens holder 100 and spaced apart by the predetermined distance. That is, in this embodiment, a preset distance between the central symmetry axis of the accommodating hole 110 of the lens holder 100 and the central symmetry axis of the outer wall surface of the lens holder 100 is the same as a preset distance between the optical axis of the lens 200 and the central symmetry axis of the outer wall surface of the lens holder 100.
Specifically, the accommodating hole 110 of the lens holder 100 is used for accommodating the lens 200, so that the central symmetry axis of the accommodating hole 110 is coaxial with the optical axis of the lens 200, and the central symmetry axis of the accommodating hole 110 is parallel to the central symmetry axis of the outer wall surface and spaced by the predetermined distance. At this time, since the preset distance between the central symmetry axis of the accommodation hole 110 of the lens holder 100 and the central symmetry axis of the outer wall surface 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 surface of the lens holder 100, the optical axis of the lens 200 and the central symmetry axis of the outer wall surface can be spaced from each other as long as the lens 200 is assembled in the accommodation hole of the lens holder 100.
In one embodiment, the lens holder 100 further includes a light-passing hole 120, and the light-passing hole 120 is disposed in communication with the accommodating hole 110;
wherein the aperture of the light passing hole 120 is smaller than that of the accommodating hole 110, so as to form a step part at the connection part of the accommodating hole 110 and the light passing hole 120, and one end of the lens 200 abuts on the step part;
and/or the central symmetry axis of the light passing hole 120 and the central symmetry axis of the accommodating hole 110 are parallel to each other and spaced by the preset distance;
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.
Specifically, the lens fixing base 100 includes a light-passing hole 120 and a receiving hole 110, and the light-passing hole 120 is communicated with the receiving hole 110. The light emitted from the laser assembly 400 sequentially passes through the light-passing hole 120 and the lens 200 of the accommodating hole 110 and is emitted to the outside. On one hand, since the aperture of the light passing hole 120 is smaller than that of the accommodating hole 110, a step is formed at the junction of the accommodating hole 110 and the light passing hole 120. When the lens 200 is mounted in the accommodation hole 110, one end of the lens 200 abuts on the stepped portion. That is, the installation position of the lens 200 can be limited by the stepped portion, so that the accurate alignment of the installation position of the lens 200 is realized. On the other hand, since the central symmetry axis of the light passing hole 120 and the central symmetry axis of the accommodating hole 110 are parallel to each other and spaced by a predetermined distance, and the optical axis of the laser assembly 400 coincides with the central symmetry axis of the light passing hole 120, the light emitted by the laser assembly 400 is deflected at a certain angle after passing through the lens 200.
In one embodiment, the lens holder 100 includes a first end and a second end, the first end of the lens holder 100 is used for receiving light input; the second end of the lens fixing seat 100 is used for outputting light;
the receiving hole 110 is disposed at the second end of the lens holder 100.
Specifically, since the receiving hole 110 is directly disposed at the second end of 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 assembling process. After the position of the lens 200 is adjusted, the lens 200 can be fixed in the lens holder 100 by dispensing.
In one embodiment, the outer wall 130 of the lens holder 100 includes a first portion and a second portion, the first portion of the outer wall 130 is disposed near the first end, the second portion of the outer wall 130 is disposed near the second end, and a radius of a cross section of the second portion of the outer wall 130 perpendicular to the central symmetry axis is smaller than a radius of a cross section of the first portion of the outer wall 130 perpendicular to the central symmetry axis.
Specifically, the outer wall 130 includes a first portion disposed proximate to the first end and a second portion disposed proximate to 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. In one aspect, the radius of the cross-section of the first portion of the outer wall surface 130 is set to be larger, and when the lens holder 100 is installed in the sleeve 300, it can be fixed in the sleeve 300 by interference fit.
In one embodiment, a 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.
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 approaching the second end surface, and when the lens holder 100 is mounted in the sleeve 300, a certain gap is formed between the second portion of the outer wall surface 130 and the inner circumferential surface of the mounting hole 310. At this time, the lens 200 will not directly contact with the sleeve 300 in the transverse direction, so that the stress on the sleeve 300 is prevented from being directly transmitted to the lens 200, thereby causing damage to the lens 200.
In one embodiment, the axial length of the second portion of the outer wall surface 130 is greater than the depth of the receiving bore 110.
Specifically, the axial length of the second portion of the outer wall surface 130 is greater than the depth of the receiving hole 110. Since the lens 200 is disposed in the receiving hole 110, the lens holder 100 is spaced from the inner circumferential surface of the mounting hole 310 by a certain distance at the position where the lens 200 is disposed, so as to prevent the stress on the sleeve 300 from being directly transmitted to the lens 200.
In one embodiment, the offset distance between the optical axis of the lens 200 and the central symmetry axis of the outer wall surface 130 of the lens holder 100 is in the range of 0.07mm to 0.13 mm.
One embodiment of the present invention further provides a lens module, including:
a sleeve 300; and
the lens assembly of any of the above embodiments, disposed inside the sleeve 300.
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 formed 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. After the lens 200 is fixed to the lens holder 100, the lens holder 100 is pushed into the sleeve 300. Since the lens holder 100 is a single body and has a large volume, the lens holder 100 and the sleeve 300 can be easily assembled during the assembly process. That is to say, the method can better improve the assembly efficiency of the laser module.
And, in the conventional laser module, the lens 200 is usually in direct contact with the sleeve 300, and during the assembly process, the lens 200 is directly pressed against the sleeve 300, so that the lens 200 is easily damaged, and in addition, the contact stress between the lens 200 and the sleeve 300 can cause the lens 200 to be easily broken due to dropping or collision during the subsequent transportation or use process. In the embodiment of the present invention, by disposing the lens 200 in the receiving hole 110 of the lens holder 100, when the lens 200 is assembled into the sleeve 300 of the lens 200 module, the lens holder 100 can protect the lens 200, thereby preventing the lens 200 from directly contacting the sleeve 300. At this time, the stress generated during the transportation or use is not easily transmitted to the lens 200 through the sleeve 300, thereby preventing the lens 200 from being broken.
In one embodiment, the sleeve 300 comprises:
a mounting hole 310;
a light exit hole 320; and
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;
the lens fixing base 100 includes a first end and a second end, the second end of the lens fixing base 100 abuts against the positioning portion 330, and the first end of the lens fixing base 100 is far away from the positioning portion 330.
Specifically, the positioning portion 330 is used for defining the position of the lens 200 mounting seat, the second end on which the lens 200 is mounted abuts against the positioning portion 330, and the light beam incident from the first end is deflected by the lens 200 in the lens 200 mounting seat and then is emitted from the second end and enters the light exit hole 320.
In one embodiment, the outer wall 130 of the lens holder 100 includes a first portion and a second portion, a first portion of the outer wall surface 130 is disposed proximate the first end, a second portion of the outer wall surface 130 is disposed proximate the second end, a first portion of the outer wall surface 130 has a cross-sectional radius perpendicular to the central axis of symmetry that is greater than a cross-sectional radius of the mounting hole 310 perpendicular to the central axis of symmetry, a portion of the second portion of the outer wall surface 130 near the second end has a smaller radius of section perpendicular to the central axis of symmetry than a radius of section of the mounting hole 310 perpendicular to the central axis of symmetry, a portion of the second portion of the outer wall surface 130 away from the second end has a larger radius of cross section perpendicular to the central axis of symmetry than a radius of cross section of the mounting hole 310 perpendicular to the central axis of symmetry, a second portion of the outer wall surface 130 of the lens holder 100 is in interference fit with the mounting hole 310.
Specifically, when the second portion of the outer wall surface 130 of the lens holder 100 is in interference fit with the mounting hole 310, a gap is formed between the portion of the second portion of the outer wall surface 130 having a smaller cross-sectional radius than the cross-sectional radius of the mounting hole 310 and the inner circumferential surface of the mounting hole 310, so that the stress on the sleeve 300 is prevented from being directly transmitted to the lens 200 again.
In one embodiment, the mounting holes 310 include a first mounting hole 311 and a second mounting hole 312;
the first mounting hole 311 is disposed at an end close to the positioning portion 330, and the first mounting hole 311 is used for accommodating the lens 200 assembly;
the second mounting hole 312 is disposed at an end away from the positioning portion 330, and the second mounting hole 312 is used for accommodating the laser assembly 400.
Specifically, the laser assembly 400 located in the second mounting hole 312 generates a laser beam to be emitted to the lens 200 assembly of the first mounting hole 311, and the laser beam enters from the light-passing hole 120 of the lens 200 assembly and passes through the lens 200, which is not coaxial with the lens 200 mounting seat, in the lens 200 assembly to generate deflection.
In one embodiment, 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 disposed;
the central symmetry axis of the outer wall surface 130 of the lens holder 100 is coaxial with the central symmetry axis of the inner circumferential surface of the mounting hole 310.
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 emitting hole 320 are coaxially arranged, so that multiple times of positioning is not required during processing of the sleeve 300, and positioning deviation of processing is reduced; and the central symmetry axis of the outer wall surface 130 of the lens fixing seat 100 and the central symmetry axis of the inner circumferential surface of the mounting hole 310 are coaxially arranged, so that when the lens fixing seat 100 is installed in the mounting hole 310, the angle of the lens fixing seat 100 can be rotatably adjusted, and the light beam emitted from the lens fixing seat 100 and deflected by the lens 200 is emitted from the light emitting hole 320 at a limited position.
In one embodiment, the sleeve 300 is a one-piece structure;
and/or, the sleeve 300 is made of heat conductive material, and the strength of the sleeve 300 is greater than that of the lens holder 100.
Specifically, the heat generated by the laser assembly 400 during the working process affects the working of the laser assembly 400 when the heat reaches a certain degree, so that the sleeve 300 made of the heat-conducting material can transfer the heat generated by the laser assembly 400 during the working process to the external environment to prevent overheating; and the strength of the sleeve 300 is greater than that of the lens fixing seat 100, so that the sleeve 300 is ensured not to deform in the process of installing the lens fixing seat 100 in an interference fit manner.
In one embodiment, the sleeve 300 is made of metal, and the lens holder 100 is made of plastic.
Specifically, the sleeve 300 is made of a metal material, and the lens holder 100 is made of a plastic material. In one aspect, with the sleeve 300 made of a metal material, heat generated by the laser assembly 400 during operation can be transferred to the external environment through the sleeve 300, thereby facilitating heat dissipation of the laser assembly 400. On the other hand, through lens fixing base 100 that the plastic material made, lens fixing base 100 can absorb the stress that the laser module produced in work or transportation to further promoted laser subassembly 400's reliability.
And, the lens 200 is installed in the lens holder 100, and the lens holder 100 is manufactured by injection molding. On the one hand, the lens fixing seat 100 manufactured by injection molding is used for forming the lens fixing seat 100 and the accommodating hole 110 for installing the lens 200 at one time, the central axis of the accommodating hole 110 is parallel to the central symmetry axis of the lens fixing seat 100 at a preset interval, so that the deviation precision of the optical axis of the lens 200 is higher, and the light emitted by the laser assembly 400 passes through the deflection angle generated behind the lens 200 more accurately. On the other hand, the lens holder 100 manufactured by injection molding eliminates the process of manufacturing a through hole having an eccentric shaft on the metal sleeve 300, so that the manufacturing cost of the laser module can be saved.
One embodiment of the present invention further provides a laser module, including:
the lens 200 module of any of the above embodiments; and
Specifically, the optical axis of the laser assembly 400 and the optical axis of the lens 200 are parallel to each other and spaced by a preset distance, so that the light emitted by the laser assembly 400 can be deflected at a specific angle after passing through the lens 200, thereby meeting the requirements of practical application scenarios.
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 emitting hole 320. The second end of the lens holder 100 abuts against the positioning portion 330, and the first end of the lens holder 100 is disposed close to the laser assembly 400.
Specifically, the light beam emitted by the laser assembly 400 enters from the first end of the lens holder 100 and then exits from the second end of the lens holder 100, and in the process from the first end to the second end, the light beam passes through the lens 200 to form a certain deflection angle, and then exits along the light exit hole 320 through the positioning portion 330.
In one embodiment, the mounting holes 310 include a first mounting hole 311 and a second mounting hole 312, the first mounting hole 311 is disposed at an end close to the positioning portion 330, the second mounting hole 312 is disposed at an end far from the positioning portion 330, the first mounting hole 311, the second mounting hole 312 and the light emitting hole 320 are communicated, the second mounting hole 312 and the light emitting hole 320 are respectively located at two ends of the first mounting hole 311, the lens 200 assembly is disposed in the first mounting hole 311, the laser assembly 400 is disposed in the second mounting hole 312, and an optical axis of the laser assembly 400 is coaxial with a central symmetry axis of the second mounting hole 312.
Specifically, the optical axis of the laser assembly 400 is coaxially arranged with the central symmetry axis of the second mounting hole 312, so that when the laser assembly 400 is mounted in the sleeve 300, the laser assembly 400 can be slowly pushed into the second mounting hole 312 of the sleeve 300 in a linear motion manner, and the most appropriate mounting position of the laser assembly 400 can be determined. That is, the position of the projected spot of the laser assembly 400 after passing through the lens 200 assembly is substantially fixed.
In one embodiment, the laser assembly 400 includes a base and a light source disposed on the base, the base of the laser assembly 400 is inserted into the second mounting hole 312 of the sleeve 300, and a central symmetry axis of the base of the laser assembly 400 is coaxially disposed with a central symmetry axis of the second mounting hole 312.
Specifically, the base of the laser assembly 400 is inserted into the second mounting hole 312 of the sleeve 300 in an interference fit manner, and the central symmetry axis of the base of the laser assembly 400 is coaxial with the central symmetry 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 installation hole 312 of the sleeve 300 by means of linear motion, and meanwhile, the laser assembly 400 is always kept in the power-on state. By continuously detecting the shape of the projected spot of the laser assembly 400 after passing through the lens 200 during the advancement of the laser assembly 400, the most suitable mounting position of the laser assembly 400 can be determined. That is, the position of the projected light spot of the laser assembly 400 passing through the lens 200 is basically fixed, and the adjustment of the light spot form can be realized only by adjusting the position relationship between the laser assembly 400 and the lens 200, so that the reliability and consistency of the laser module product are enhanced.
In one embodiment, the laser module is a laser emitting module.
An embodiment of the present invention further provides a laser radar apparatus, including the laser module according to any one of the above embodiments.
As shown in fig. 4 and 5, when the laser radar apparatus is applied to a robot for sweeping the floor, the light emitted from the laser assembly 400 generally needs to be deflected at a specific angle after passing through the lens 200, and generally, the optical axis of the lens 200 and the optical axis of the laser assembly 400 are parallel to each other and spaced by a preset distance, so as to generate the above-mentioned deflection effect and meet the requirements of the actual application scenario of the laser radar apparatus. 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, the sleeve 300 is required to be machined with the lens 200 mounting hole 310 having the eccentric axis. On one hand, the lens 200 mounting hole 310 is machined in the metal sleeve 300, the central symmetry axis of the lens 200 mounting hole 310 and the central symmetry axis of the sleeve 300 are parallel to each other and are spaced by a preset distance, the central symmetry axis of the light source mounting hole 310 and the central symmetry axis of the sleeve 300 are coaxial, multiple processes are required to respectively machine the sleeve 300 for multiple times to form the lens 200 mounting hole 310 and the light source assembly mounting hole 310 which are not coaxial, and different clamps are adopted and repositioned in each machining process, which easily causes machining and positioning deviation, and further, the deviation distance precision of the central symmetry axis of the manufactured lens 200 mounting hole 310 is difficult to ensure, and the projected light spot position deviates out of a limited range, as shown in a part a in fig. 5. On the other hand, machining the lens 200 mounting hole 310 and the light source unit mounting hole 310 on the sleeve 300, which are not coaxial, requires more steps and requires different jigs, and therefore, the machining cost is also high. In the embodiment of the present invention, the lens 200 is installed in the lens holder 100, and the lens holder 100 is manufactured by injection molding. On one hand, the lens fixing seat 100 manufactured by injection molding is used for forming the lens fixing seat 100 at one time and is used for installing the accommodating hole 110 of the lens 200, wherein the central axis of the accommodating hole 110 is parallel to the central symmetry axis of the lens fixing seat 100 at a preset interval, so that the deviation precision of the optical axis of the lens 200 is higher, the deflection angle of the light emitted by the laser assembly 400 after passing through the lens 200 is more accurate, and the light spot falls within a limited range, as shown in part b in fig. 5. On the other hand, the lens holder 100 manufactured by injection molding eliminates the process of manufacturing a through hole having an eccentric shaft on the metal sleeve 300, so that the manufacturing cost of the laser module can be saved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (20)
1. A lens assembly, comprising:
the lens fixing seat is provided with a containing hole; and
the lens is arranged in the accommodating 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 are spaced by a preset distance.
2. The lens assembly of claim 1,
the central symmetry axis of the accommodating hole of the lens fixing seat is coaxial with the optical axis of the lens; and
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 are spaced by the preset distance.
3. The lens assembly of claim 2, wherein the lens holder further includes a light aperture, the light aperture being in communication with the receiving aperture;
the aperture of the light through hole is smaller than that of the accommodating hole so as to form a step part at the joint of the accommodating hole and the light through hole, and one end of the lens is abutted against the step part;
and/or the central symmetry axis of the light through hole and the central symmetry axis of the containing 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 coaxial with the central symmetry axis of the outer wall surface of the lens fixing seat.
4. The lens assembly of claim 2,
the lens fixing seat comprises a first end and a second end, and the first end of the lens fixing seat is used for receiving light input; the second end of the lens fixing seat is used for outputting light;
the accommodating hole is formed in the second end of the lens fixing seat.
5. The lens assembly of claim 4, wherein the outer wall of the lens holder includes a first portion and a second portion, the first portion of the outer wall being disposed proximate the first end and the second portion of the outer wall being disposed proximate the second end, the second portion of the outer wall having a cross-sectional radius perpendicular to the central axis of symmetry that is smaller than a cross-sectional radius perpendicular to the central axis of symmetry of the first portion of the outer wall.
6. The lens assembly of claim 5, wherein a cross-sectional radius of the second portion of the outer wall surface perpendicular to the central axis of symmetry decreases in a direction proximate the second end surface.
7. The lens assembly of claim 5, wherein the second portion of the outer wall surface has an axial length greater than a depth of the receiving aperture.
8. The lens assembly of any one of claims 1-7, wherein the optical axis of the lens is offset from the central axis of symmetry of the outer wall of the lens holder by a distance in a range of 0.07mm to 0.13 mm.
9. A lens module, comprising:
a sleeve; and
the lens assembly of any one of claims 1-8, disposed inside the sleeve.
10. The lens module of claim 9, wherein the sleeve comprises:
mounting holes;
a light exit hole; and
the positioning part is arranged between the mounting hole and the light outlet 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 abutted to the positioning portion, and the first end of the lens fixing seat is far away from the positioning portion.
11. The lens module of claim 10, wherein the outer wall of the lens holder includes a first portion and a second portion, a first portion of the outer wall surface is disposed proximate the first end and a second portion of the outer wall surface is disposed proximate the second end, a sectional radius of the first portion of the outer wall surface perpendicular to the central symmetry axis is larger than a sectional radius of the mounting hole perpendicular to the central symmetry axis, a portion of the second portion of the outer wall surface near the second end has a smaller cross-sectional radius perpendicular to the central axis of symmetry than a cross-sectional radius perpendicular to the central axis of symmetry of the mounting hole, the section radius of a part, far away from the second end, of the second part of the outer wall surface, which is perpendicular to the central symmetry axis, is larger than the section radius of the mounting hole, which is perpendicular to the central symmetry axis, and the second part of the outer wall surface of the lens fixing seat is in interference fit with the mounting hole.
12. The lens module of claim 10, wherein the mounting holes comprise a first mounting hole and a second mounting hole;
the first mounting hole is arranged at one end close to the positioning part and used for accommodating the lens assembly;
the second mounting hole is formed in one end, far away from the positioning portion, of the second mounting hole, and the second mounting hole is used for containing the laser assembly.
13. The lens module according to any one of claims 9-12,
the central symmetry axis of the outer peripheral surface of the sleeve, the central symmetry axis of the inner peripheral surface of the mounting hole and the central symmetry axis of the inner peripheral surface of the light outlet hole are coaxially arranged;
the central symmetry axis of the outer wall surface of the lens fixing seat and the central symmetry axis of the inner circumferential surface of the mounting hole are coaxially arranged.
14. The lens module according to any one of claims 9-12,
the sleeve is of an integrated structure;
and/or the sleeve is made of heat conducting materials, and the strength of the sleeve is greater than that of the lens fixing seat.
15. The lens module of claim 14, wherein the sleeve is made of a metal material and the lens holder is made of a plastic material.
16. A laser module, comprising:
the lens module of any one of claims 9-15; and
the laser assembly is arranged inside the sleeve, light emitted by the laser assembly passes through the lens inside the lens assembly and then is emitted out of the lens module, and the optical axis of the laser assembly is parallel to the optical axis of the lens and is spaced from the optical axis of the lens by the preset distance.
17. The laser module as claimed in claim 16, wherein the lens holder includes a first end and a second end, and the sleeve includes a mounting hole and a light exit hole; and the positioning part is arranged between the mounting hole and the light emitting hole, the second end of the lens fixing seat is abutted to the positioning part, and the first end of the lens fixing seat is close to the laser assembly.
18. The laser module as claimed in claim 17, wherein the mounting holes include a first mounting hole and a second mounting hole, the first mounting hole is disposed at an end close to the positioning portion, the second mounting hole is disposed at an end away from the positioning portion, the first mounting hole, the second mounting hole and the light emitting hole are communicated, the second mounting hole and the light emitting hole are respectively disposed at two ends of the first mounting hole, the lens assembly is disposed in the first mounting hole, the laser assembly is disposed in the second mounting hole, and an optical axis of the laser assembly is disposed coaxially with a central symmetry axis of the second mounting hole.
19. The laser module as claimed in claim 18, wherein the laser assembly includes a base and a light source disposed on the base, the base of the laser assembly is inserted into the second mounting hole of the sleeve, a central symmetry axis of the base of the laser assembly is disposed coaxially with a central symmetry axis of the second mounting hole, and a central symmetry axis of the outer wall surface of the lens holder is disposed coaxially with a central symmetry axis of the first mounting hole.
20. Lidar device, comprising a laser module according to any of claims 16 to 19.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210860647.6A CN115236632A (en) | 2021-12-17 | 2021-12-17 | Lens module, laser module and laser radar device |
| CN202111550938.7A CN114252864B (en) | 2021-12-17 | 2021-12-17 | Lens module, laser module and laser radar device |
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| CN202111550938.7A CN114252864B (en) | 2021-12-17 | 2021-12-17 | Lens module, laser module and laser radar device |
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| CN115097416A (en) * | 2022-07-25 | 2022-09-23 | 湖南阿秒光学科技有限公司 | Laser receiving module and laser radar |
| CN115236632A (en) * | 2021-12-17 | 2022-10-25 | 湖南阿秒光学科技有限公司 | Lens module, laser module and laser radar device |
| CN116009009A (en) * | 2022-05-26 | 2023-04-25 | 湖南阿秒光学科技有限公司 | TOF laser measurement system, laser emission and receiving module and laser radar |
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Also Published As
| Publication number | Publication date |
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| CN115236632A (en) | 2022-10-25 |
| CN114252864B (en) | 2022-08-19 |
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