Image acquisition lens group

Abstract

The invention discloses an image acquisition lens group, and relates to the technical field of laser welding, the image acquisition lens group comprises a sleeve, a driving barrel, a lens barrel, an imaging assembly and a rotating member, the sleeve is provided with a cavity; the driving cylinder is arranged in the cavity in the front-back direction and can rotate along the axis in the front-back direction, at least one driving chute is formed in the peripheral wall of the driving cylinder, and the driving chute extends in the front-back direction; the lens barrel is movably installed in the driving barrel in the front-back direction, at least one connecting piece is fixed to the peripheral wall of the lens barrel, the connecting piece is installed in the driving chute in a sliding mode, and when the driving barrel rotates relative to the lens barrel, the driving chute drives the connecting piece to drive the lens barrel to move front and back; the rotating piece is rotationally mounted at the rear end of the sleeve, is in sliding connection with the part, extending out of the driving barrel, of the rear end of the lens barrel and is used for driving the lens barrel to rotate in the rotating process; by controlling the lens cone to move in the front-back direction and swing along the axis in the front-back direction, the image acquisition range of the imaging assembly is expanded, and the observation effect on the welding condition at the laser focus is improved.

Description

Technical Field

[0001] This invention relates to the field of laser welding technology, and in particular to an image acquisition lens assembly. Background Technology

[0002] Laser welding is a highly efficient and precise welding method that utilizes a high-energy-density laser beam as a heat source. It is an important application of laser materials processing technology, primarily used for welding thin-walled materials and low-speed welding. The welding process is heat conduction type, meaning the laser radiation heats the workpiece surface, and the surface heat diffuses inward through heat conduction. By controlling parameters such as the laser pulse width, energy, peak power, and repetition frequency, the workpiece melts, forming a specific molten pool. Due to its unique advantages, it has been successfully applied to the precision welding of micro and small parts.

[0003] In laser welding, it is necessary to inspect the position of the weld joint, especially for small weld joints, otherwise it is easy to cause weld joint misalignment, welding deviation, etc. However, in the existing technology, the height of the weld joint position is different for different products, making it difficult to change the inspection position according to different products. Summary of the Invention

[0004] The main objective of this invention is to propose an image acquisition lens assembly that expands the image acquisition range of the imaging component and improves the observation effect on the welding situation at the laser focus.

[0005] To achieve the above objectives, the present invention proposes an image acquisition lens assembly, comprising: A sleeve having a cavity; A drive cylinder is disposed in the cavity along the front-back direction and can rotate along the front-back axis. At least one drive groove is formed on the peripheral wall of the drive cylinder. The drive groove extends along the front-back direction, and the front end and the rear end of the drive groove are offset along the circumference of the drive cylinder. The lens barrel is movably installed in the drive cylinder in the front-back direction, and at least part of it can extend out of the drive cylinder in the rear direction. At least one connector is fixed to the outer peripheral wall of the lens barrel. The connector is slidably installed in the drive groove. When the drive cylinder rotates relative to the lens barrel, the drive groove drives the connector to move the lens barrel back and forth. An imaging assembly is disposed within the lens barrel; and, A rotating component is rotatably mounted on the rear end of the sleeve and is at least partially connected to the portion of the lens barrel that extends out of the drive cylinder. It is used to drive the lens barrel to rotate during rotation, so that the extension direction of the lens barrel is set at an angle to the front-rear axis.

[0006] In one embodiment, the peripheral wall of the lens barrel is provided with a groove corresponding to the drive groove; The connector includes: The first bearing is disposed within the drive slant groove; A pin passes through the inner hole of the first bearing and is fixed to the groove of the lens barrel.

[0007] In one embodiment, the imaging assembly includes an aperture stop, a first lens, a second lens, and a third lens arranged sequentially along the front-back direction; Wherein, the first lens has a positive optical power, the second lens has a negative optical power, and the third lens has a positive optical power.

[0008] In one embodiment, the optical power of the first lens is φ1, the optical power of the second lens is φ2, and the optical power of the third lens is φ3, wherein the optical power of each lens satisfies: 0.07≤|φ1|≤0.09, 0.06≤|φ2|≤0.08, 0.02≤|φ3|≤0.04.

[0009] In one embodiment, the rear end of the inner side of the lens barrel is stepped to form a forward-facing abutting surface, and at least a portion of the rear end of the imaging component abuts against the abutting surface; The imaging component includes: A spacer ring, arranged in a ring shape, is disposed between the first lens and the second lens, and abuts against both the first lens and the second lens; and, A pressure ring, one end of which is fixedly connected to the inside of the lens barrel and located at the front end of the lens barrel.

[0010] In one embodiment, the sleeve includes a first section and a second section whose inner diameter increases sequentially in the front-rear direction. The portion of the lens barrel located inside the drive cylinder is provided corresponding to the second section to allow the lens barrel to swing and make way. The rotating component includes: A rotating ball, having a through hole along its front-to-back direction, is fitted onto the portion of the lens barrel extending beyond the drive cylinder at its rear end; at least a portion of the outer surface of the rotating ball is rotatably mounted to the first section; and... The pressure plate is arranged in a ring shape, and the inner side of the pressure plate is adapted to the outer side of the rotating ball, and rolls in cooperation with another part of the outer side of the rotating ball.

[0011] In one embodiment, the sleeve has at least one threaded hole extending radially through it corresponding to the second segment; The image acquisition lens assembly also includes: A protective sleeve is fitted onto the second section of the drive cylinder; and, At least one locking screw is threadedly connected to the threaded hole; The locking screw has a locking state in which it moves radially along the sleeve to abut against the protective sleeve, and an adjustment state in which it is spaced apart from the protective sleeve.

[0012] In one embodiment, the image acquisition lens assembly further includes a fixed cylinder disposed between the driving cylinder and the lens cylinder in a front-to-back direction. The peripheral wall of the fixed cylinder is formed with at least one driving straight groove corresponding to the driving inclined groove, and the driving straight groove extends in a front-to-back direction. The connector passes through the drive straight groove to slide in conjunction with the drive inclined groove, and slides along the drive straight groove when the drive cylinder rotates relative to the lens barrel.

[0013] In one embodiment, the image acquisition lens assembly further includes a vision acquisition component, the vision acquisition component comprising: A vision camera is fixedly connected to the rear end of the fixed cylinder or the sleeve; and, A locking ring is fitted onto the connection between the vision camera and the fixed cylinder or the sleeve to lock the vision camera.

[0014] In one embodiment, a sealing groove is recessed on the peripheral side of the rear end of the fixed cylinder, and an O-ring is provided in the sealing groove to seal with the drive cylinder.

[0015] In the technical solution of this invention, by setting the driving groove on the driving cylinder and cooperating with the connecting member on the lens barrel, simply rotating the driving cylinder can drive the imaging component inside the lens barrel to move back and forth, thereby achieving focusing. The lens barrel does not rotate directly, thus avoiding the problem of resolution mismatch caused by the change in eccentricity with rotation. In addition, by setting the rotating member to drive the part of the lens barrel that extends out of the driving cylinder at the rear end, the rotating member drives the lens barrel to rotate along the front-back axis during rotation, thereby expanding the image acquisition range of the imaging component, making it easier to focus on the laser welding position, and improving the observation effect of the welding situation at the laser welding position, i.e., the laser focal point. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the image acquisition lens assembly provided by the present invention; Figure 2 for Figure 1A cross-sectional view of the image acquisition lens group along direction AA; Figure 3 for Figure 1 A schematic diagram of the structure of the image acquisition lens group after the hidden sleeve is installed; Figure 4 for Figure 1 A cross-sectional view of another embodiment of the rotating component.

[0018] Explanation of icon numbers: 100. Image acquisition lens assembly; 1. Sleeve; 11. Cavity; 12. First section; 13. Second section; 2. Drive cylinder; 21. Drive inclined groove; 3. Lens barrel; 31. Connector; 311. Pin; 312. First bearing; 32. Clamping surface; 4. Imaging assembly; 41. First lens; 42. Second lens; 43. Third lens; 44. Spacer; 45. Pressure ring; 5. Rotating component; 51. Rotating ball; 52. Pressure plate; 53. Rotating ring; 54. Concave boss; 6. Protective sleeve; 7. Locking screw; 8. Fixing cylinder; 81. Drive straight groove; 82. Sealing groove; 83. O-ring; 9. Vision acquisition assembly; 91. Vision camera; 92. Locking ring.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] This invention proposes an image acquisition lens assembly 100.

[0024] Please see Figure 1-2 In one embodiment of the present invention, the image acquisition lens assembly 100 includes a sleeve 1, a drive cylinder 2, a lens barrel 3, an imaging component 4, and a rotating component 5: the sleeve 1 has a cavity 11; the drive cylinder 2 is disposed in the cavity 11 in the front-rear direction and is rotatable along the front-rear axis; at least one drive groove 21 is formed on the peripheral wall of the drive cylinder 2, the drive groove 21 extends in the front-rear direction, and the front end and the rear end of the drive groove 21 are offset from each other in the circumferential direction of the drive cylinder 2; the lens barrel 3 is movably mounted on the drive cylinder in the front-rear direction. The lens barrel 3 is located within the drive cylinder 2, and at least part of it can extend rearward from the drive cylinder 2. At least one connector 31 is fixed to the outer peripheral wall of the lens barrel 3. The connector 31 is slidably installed in the drive groove 21. When the drive cylinder 2 rotates relative to the lens barrel 3, the drive groove 21 drives the connector 31 to move the lens barrel 3 back and forth. The imaging component 4 is located inside the lens barrel 3. The rotating component 5 is rotatably installed at the rear end of the sleeve 1 and is slidably connected to the part of the rear end of the lens barrel 3 that extends out of the drive cylinder 2, so as to drive the lens barrel 3 to rotate during rotation.

[0025] It should be noted that the number of drive grooves 21 can be determined by comprehensively considering the adjustment stroke and adjustment accuracy of the actual focusing structure. Since the drive cylinder 2 is generally subjected to force at one or two points, resulting in poor stability, preferably, three drive grooves 21 and three connecting pieces 31 are provided. The three connecting pieces 31 and the three drive grooves 21 form a stable three-point structure, further improving the stability and accuracy of the lens barrel 3's movement. The built-in lens barrel 3 ensures the stability of the product's performance during transportation through these three points, achieving stable force application.

[0026] In the technical solution of the present invention, by setting the driving groove 21 on the driving cylinder 2 and cooperating with the connecting member 31 on the lens barrel 3, simply rotating the driving cylinder 2 can drive the imaging component 4 inside the lens barrel 3 to move back and forth, thereby achieving focusing. The lens barrel 3 does not rotate directly, thus avoiding the problem of resolution mismatch caused by the change in eccentricity with rotation. In addition, by setting the rotating member 5 to drive the part of the lens barrel 3 that extends out of the driving cylinder 2, the rotating member 5 drives the lens barrel 3 to rotate along the front-back axis during rotation, thereby expanding the image acquisition range of the imaging component 4, making it easier to focus on the laser welding position, and improving the observation effect of the welding situation at the laser welding position, i.e., the laser focal point.

[0027] It should be noted that the rotating component 5 can drive the lens barrel 3 to swing in various ways. In one embodiment of the present invention, the portion of the lens barrel 3 located inside the drive cylinder 2 corresponds to the second segment 13, for the lens barrel 3 to swing and make room. The rotating component 5 includes a rotating ball 51 and a pressure plate 52. The rotating ball 51 has a through hole in the front-rear direction for fitting onto the portion of the lens barrel 3 that extends out of the drive cylinder 2 and is slidably connected to the rear end of the lens barrel 3. The rotating ball 51 is rotatably mounted on the first segment 12. The pressure plate 52 is annularly arranged, and the inner side of the pressure plate 52 is adapted to the outer side of the rotating ball 51 and is rolledly connected to at least a portion of the outer side of the rotating ball 51. Thus, by rotating the rotating ball 51, the lens barrel 3 inside the through hole swings around the rotating ball 51, thereby expanding the image acquisition range of the imaging component 4, making it easier to focus on the laser welding position, and improving the observation effect of the welding situation at the laser welding position, i.e., the laser focal point. Furthermore, the portion of the lens barrel 3 located inside the drive cylinder 2 is positioned corresponding to the second segment 13, such that there is a gap between the second segment 13 with a larger inner diameter and the drive cylinder 2 sleeved outside the lens barrel 3, thereby providing clearance for the swinging of the lens barrel 3.

[0028] It is understood that the required swing range of the lens barrel 3 is not large, and the corresponding rotation range of the rotating ball 51 is also not large. Therefore, the rotating ball 51 can be partially rotated and installed on the first section 12. The present invention can be changed according to the actual swing range requirements of the lens barrel 3. In addition, the inner side of the pressure plate 52 is adapted to the outer side of the rotating ball 51 and abuts against another part of the outer side of the rotating ball 51, thereby ensuring the rotation of the rotating ball 51 while restricting its movement in the front and back directions, thereby improving the adjustment stability.

[0029] In another embodiment of the invention, such as Figure 4As shown, the second segment 13 is recessed with a rotating groove. The rotating component 5 may also include a rotating ring 53 disposed in the rotating groove and surrounding the lens. The rotating ring 53 is made of an elastic material. The lens barrel 3 has multiple concave bosses 54 protruding from the rotating ring 53. The rotating ring 53 is engaged in the grooves of the concave bosses 54. When rotation is required, the sidewall of the groove squeezes the rotating ring 53 to tilt the lens barrel 3. Specifically, the rotating ring 53 may be made of nitrile rubber, which provides elasticity while achieving a sealing fit between the lens barrel 3 and the sleeve 1.

[0030] In one embodiment of the present invention, the sleeve 1 has at least one threaded hole extending radially along the sleeve 1 corresponding to the second segment 13; the image acquisition lens assembly 100 further includes a protective sleeve 6 and at least one locking screw 7, the protective sleeve 6 being sleeved on the second segment 13 of the drive cylinder 2; each locking screw 7 is threadedly connected to the threaded hole; wherein, the locking screw 7 has a locking state where it moves radially along the sleeve 1 to abut against the protective sleeve 6, and an adjustment state where it is spaced apart from the protective sleeve 6. When it is necessary to adjust the swing angle of the lens barrel 3, the locking screw 7 moves radially outward along the sleeve 1 to be spaced apart from the protective sleeve 6; and after the adjustment is completed, each locking screw 7 abuts against the protective sleeve 6 radially along the sleeve 1, thereby restricting the movement of the drive cylinder 2 and locking the lens barrel 3. By providing the protective sleeve 6, the locking screw 7 is prevented from directly abutting against the drive cylinder 2, reducing wear on the wall of the drive cylinder 2. To further increase service life, the protective sleeve 6 can be made of flexible material such as rubber to reduce wear.

[0031] To provide a longer service life, in one embodiment of the present invention, the peripheral wall of the lens barrel 3 is provided with a groove corresponding to the drive groove 21; the connecting member 31 includes a first bearing 312 and a pin 311, the first bearing 312 being disposed within the drive groove 21; the pin 311 passes through the inner hole of the first bearing 312 to be fixed to the groove of the lens barrel 3. By providing the first bearing 312, rolling friction is achieved between the screw and the drive groove 21, thereby reducing wear and improving the service life of the focusing structure. It can be understood that the connecting member 31 may also be a first protrusion provided along the peripheral side of the lens barrel 3, and the first protrusion engages with the drive groove 21, the first protrusion passing through the inner hole of the first bearing 312 to be fixed to the drive groove 21.

[0032] For better imaging results, please refer to Figure 2In one embodiment of the present invention, the imaging component 4 includes an aperture stop (not shown), a first lens 41, a second lens 42 and a third lens 43 arranged sequentially along the front-back direction; wherein the first lens 41 has a positive optical power, the second lens 42 has a negative optical power and the third lens 43 has a positive optical power.

[0033] It should be noted that optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect light rays. The larger the absolute value of the optical power, the stronger the bending ability of light rays; the smaller the absolute value, the weaker the bending ability. When the optical power is positive, the refraction of light rays is converging; when the optical power is negative, the refraction of light rays is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens, or a system formed by multiple lenses (i.e., a lens group).

[0034] By setting the first lens 411 with positive optical power and a convex object side, it is beneficial to increase the principal ray angle at the edge of the field of view, which can effectively increase the field of view range; the aperture is used to adjust the light flux according to the actual situation, reduce distortion, and improve image quality; by comprehensively setting the optical power of each lens, the light path can be well controlled, and the structure can be made more compact while introducing more light, thus achieving miniaturization; by combining different lenses and rationally allocating the optical power, it has a large viewing angle, short focal length, and low distortion, resulting in better imaging effect.

[0035] Furthermore, in one embodiment of the present invention, the optical power of the first lens 41 is φ1, the optical power of the second lens 42 is φ2, and the optical power of the third lens 43 is φ3. The optical power of each lens satisfies the following conditions: 0.07≤|φ1|≤0.09, 0.06≤|φ2|≤0.08, and 0.02≤|φ3|≤0.04. By limiting the optical power of each lens, the sharpness of the imaging component 4 is improved. In addition, it is understood that temperature changes are significant during laser welding. To improve the imaging quality of the imaging component 4, in one embodiment of the present invention, the first lens 41, the second lens 42, and the third lens 43 are all glass lenses. By combining high-refractive-index glass with ultra-low dispersion glass, various optical aberrations are reduced while effectively suppressing chromatic aberration. Furthermore, because glass lenses are less susceptible to focus shift due to thermal expansion and contraction, they can effectively resist lens deformation caused by heat, maintaining high lens precision over a long period. In addition, it can eliminate aberrations that occur during imaging as much as possible, thereby improving the image quality of the lens and reducing the impact of temperature on the lens's optical performance.

[0036] Furthermore, in order to better fix the imaging component 4, in one embodiment of the present invention, the rear end of the inner side of the lens barrel 3 is stepped to form a forward-facing abutting surface 32, and at least a portion of the rear end of the imaging component 4 abuts against the abutting surface 32; the imaging component 4 also includes a spacer ring 44 and a pressure ring 45: the spacer ring 44 is annularly arranged and disposed between the first lens 41 and the second lens 42, and abuts against the first lens 41 and the second lens 42 respectively; one end of the pressure ring 45 is fixedly connected to the inside of the lens barrel 3 and is located at the front end of the lens barrel 3.

[0037] By setting the annular spacer 44, the spacing between adjacent lenses can be controlled without affecting light propagation, thus meeting imaging requirements. It is understood that the present invention does not limit the height of the spacer 44 along the front-rear direction and can be changed according to actual imaging needs. Furthermore, in one embodiment, the rear side of the first lens 41 abuts against the mating surface 32, and the second lens 42 abuts against the third lens 43, eliminating the need for the spacer 44. In other embodiments, when it is necessary to change the spacing between the second lens 42 and the third lens 43, a spacer 44 can be adaptively set between them. By setting the pressure ring 45, while fixing the imaging component 4, the distance between the imaging component 4 and the front end of the lens barrel 3 is increased, thereby allowing the imaging component 4 to have a larger swing range when the rotating member 5 drives the lens barrel 3 to swing. Additionally, it ensures that the imaging component 4 is located within the portion of the lens barrel 3 installed inside the drive cylinder 2, improving the protection of the imaging component 4.

[0038] To ensure greater stability of the drive cylinder 2 when driving the lens barrel 3 back and forth, please refer to [link / reference needed]. Figure 3 In one embodiment of the present invention, the focusing structure further includes a fixed cylinder 8, disposed between the driving cylinder 2 and the lens barrel 3 in a front-rear direction. The peripheral wall of the fixed cylinder 8 forms at least one driving straight groove 81 corresponding to the driving inclined groove 21, and the driving straight groove 81 extends in a front-rear direction. The connecting member 31 passes through the driving straight groove 81 to slide in cooperation with the driving inclined groove 21. When the driving cylinder 2 rotates relative to the lens barrel 3, the connecting member 31 slides along the driving straight groove 81. When the driving cylinder 2 rotates relative to the fixed cylinder 8, the connecting member 31 is constrained by the side wall of the driving straight groove 81, so that the connecting member 31 can only move along the driving straight groove 81, thereby driving the lens barrel 3 to move only in the front-rear direction, avoiding circumferential displacement. It can be understood that the driving straight groove 81 can also be disposed on the periphery of the lens barrel 3, and the first protrusion can be provided on the inner wall of the fixed cylinder 8. However, considering the actual size of the lens barrel 3 and the fixed cylinder 8, as well as the specific arrangement, the configuration can be adjusted according to actual needs.

[0039] It is understood that the imaging components 4 within the drive cylinder 2 and lens barrel 3 are highly sensitive to dust, particles, and other contaminants. If the seal is inadequate, these contaminants will adhere to the optical surface, affecting image quality and causing blurry or spotted images. Therefore, in one embodiment of the invention, a sealing groove 82 is recessed on the circumferential side of the rear end of the fixed cylinder 8. An O-ring is installed within the sealing groove 82 to provide a sealing fit with the drive cylinder 2. Specifically, the depth and width of the sealing groove 82 should match the O-ring to ensure that the O-ring can be properly compressed after installation, thereby achieving an interference fit within the sealing groove 82 and providing a good sealing effect.

[0040] In one embodiment of the present invention, the image acquisition lens assembly 100 further includes a visual acquisition component 9, which includes a visual camera 91 and a locking ring 92. The visual camera 91 is fixedly connected to the rear end of the fixed cylinder 8. The locking ring 92 is sleeved at the connection between the visual camera 91 and the fixed cylinder 8 to lock the visual camera 91. By setting the visual camera 91, the image transmitted by the imaging component 4 is acquired and processed, thereby intuitively reflecting the welding situation at the laser focal point and improving the observation effect. It is understood that the drive cylinder 2 and the lens barrel 3 will move or rotate relative to the sleeve 1. Therefore, the visual camera 91 is fixed on the fixed cylinder 8 or the sleeve 1 and locked by the locking ring 92 to reduce the shaking of the visual camera 91 and improve the image acquisition effect.

[0041] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An image acquisition lens for laser welding, characterized in that, The image acquisition lens group comprises: a sleeve having a cavity; a driving cylinder arranged in the cavity along the front-rear direction and rotatable along the front-rear axis, a circumferential wall of the driving cylinder being formed with at least one driving chute extending along the front-rear direction, and a front end of the driving chute being arranged in a circumferential direction of the driving cylinder away from a rear end of the driving chute; a lens barrel movably arranged in the driving cylinder along the front-rear direction and at least partially extending out of the driving cylinder in the rear direction, an outer circumferential wall of the lens barrel being fixed with at least one connecting piece slidably arranged in the driving chute, the driving chute driving the connecting piece to drive the lens barrel to move forward and backward when the driving cylinder rotates relative to the lens barrel; an imaging assembly arranged in the lens barrel; and a rotating piece rotatably arranged at a rear end of the sleeve and at least partially drivingly connected with a portion of the lens barrel extending out of the driving cylinder in the rear direction, for driving the lens barrel to rotate in the rotating process, so that the extending direction of the lens barrel is arranged at an angle with the front-rear axis.

2. The image acquisition lens according to claim 1, wherein, The circumferential wall of the lens barrel is provided with a groove corresponding to the driving chute; The connecting piece comprises: a first bearing arranged in the driving chute; a pin penetrating through an inner hole of the first bearing and fixed in the groove of the lens barrel.

3. The image acquisition lens according to claim 1, wherein, The imaging assembly comprises, in sequence along the front-rear direction, a diaphragm, a first lens, a second lens and a third lens; wherein the first lens has a positive focal power, the second lens has a negative focal power, and the third lens has a positive focal power.

4. The image acquisition lens according to claim 3, wherein, The first lens has a focal power of φ1, the second lens has a focal power of φ2, and the third lens has a focal power of φ3, and each of the lens focal powers satisfies: 0.07≤|φ1|≤0.09, 0.06≤|φ2|≤0.08, and 0.02≤|φ3|≤0.

04.

5. The image acquisition lens according to claim 4, wherein, A rear end of an inner side surface of the lens barrel is arranged in steps to form a forwardly arranged abutting surface, and at least a portion of a rear end of the imaging assembly abuts against the abutting surface; The imaging assembly comprises: a spacer ring arranged in a ring shape between the first lens and the second lens and abutting against the first lens and the second lens respectively; and a pressing ring fixedly connected at one end to the lens barrel and located at a front end of the lens barrel.

6. The image acquisition lens according to claim 1, wherein, The sleeve comprises a first section and a second section having increasing inner diameters in sequence along the front-rear direction, and a portion of the lens barrel arranged in the driving cylinder corresponds to the second section, for allowing the lens barrel to swing to make room; The rotating piece comprises: a rotating ball having a through hole formed along the front-rear direction, for being sleeved on a portion of the lens barrel extending out of the driving cylinder in the rear direction, and at least a portion of an outer side surface of the rotating ball being rotatably arranged on the first section; and a pressing plate arranged in a ring shape, an inner side surface of the pressing plate being adapted to the outer side surface of the rotating ball and rollingly matched with another portion of the outer side surface of the rotating ball.

7. The image acquisition lens according to claim 6, wherein, The sleeve is provided with at least one threaded hole extending along a radial direction of the sleeve corresponding to the second section; The image acquisition lens group further comprises: a protective sleeve sleeved on the second section of the driving cylinder; and at least one locking screw threadedly connected with the threaded hole. The locking screw has a locking state of moving radially to the sleeve to abut against the protective sleeve and an adjusting state of being spaced apart from the protective sleeve.

8. The image acquisition lens according to claim 1, wherein, The image acquisition lens assembly further comprises a fixed barrel arranged between the driving barrel and the lens barrel along the front-rear direction, and a circumferential wall of the fixed barrel is formed with at least one driving straight slot corresponding to the driving inclined slot, the driving straight slot extending along the front-rear direction; The connecting piece passes through the driving straight slot to be in sliding fit with the driving inclined slot, and when the driving barrel rotates relative to the lens barrel, the connecting piece slides along the driving straight slot.

9. The image acquisition lens according to claim 8, wherein, The image acquisition lens assembly further comprises a visual acquisition assembly, the visual acquisition assembly comprising: a visual camera fixedly connected to the fixed barrel or the rear end of the sleeve; and a locking ring sleeved at the connection between the visual camera and the fixed barrel or the sleeve, used to lock the visual camera.

10. The image acquisition lens according to claim 8, wherein, A circumferential side surface of the rear end of the fixed barrel is recessed with a sealing groove, and an O-ring is arranged in the sealing groove to be in sealing fit with the driving barrel.

Images