Lens barrel mechanism suitable for double telecentric imaging system and optical lens assembly

Abstract

The invention relates to the technical field of optical imaging, in particular to a lens cone mechanism suitable for a double telecentric imaging system and an optical lens assembly, the lens cone mechanism comprises a lens cone body, the lens cone body is provided with a plurality of mounting holes which are sequentially and continuously arranged along a first preset direction, and the mounting holes are arranged along the first preset direction. And the plurality of mounting holes are arranged according to the rule that the inner diameters are reduced first and then increased, so that continuous stepped holes are formed. In the application, according to the characteristic that the aperture of the lens in the light path of the double-telecentric imaging system is firstly reduced and then increased, the continuous stepped holes arranged according to the rule that the inner diameter is firstly reduced and then increased are integrally processed in the lens cone body to serve as the mounting grooves of the lens in the light path of the double-telecentric imaging system, so that the lens does not need to be grouped, mounted and integrated; and the processing tolerance of the lens cone structure is reasonably optimized, and the self processing precision of the lens cone structure is utilized to guarantee the assembly precision of each lens, so that the lens is free from adjustment after being mounted in the integration stage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, in particular to a lens barrel mechanism suitable for a double telecentric imaging system and an optical lens assembly. BACKGROUND

[0002] The double telecentric imaging system refers to an optical imaging system in which a telecentric object-side imaging system and a telecentric image-side imaging system are superimposed. Specifically, the image-side focal plane of the telecentric object-side imaging system and the object-side focal plane of the telecentric image-side imaging system coincide on the diaphragm plane, and the aperture diaphragm serves as a common diaphragm. The function of the double telecentric imaging system is to eliminate the imaging errors caused by inaccurate object-side focusing and inaccurate image-side focusing. Therefore, the double telecentric imaging system has the characteristics of low distortion, large depth of field, high resolution, and consistent image magnification within a certain object distance range. Thus, it is widely used in machine vision, precision detection, image acquisition and analysis, etc.

[0003] In the double telecentric imaging system, the aperture of the lens closer to the middle aperture diaphragm of the optical path is smaller, and the aperture of the lens farther from the middle aperture diaphragm of the optical path is larger. Because the lens apertures are inconsistent in the same double telecentric optical path, in the design of the lens barrel structure of the double telecentric imaging system, the lenses are usually grouped according to the aperture and the installation position, and the lenses in each group are installed on a lens barrel structure to form a lens group. Then, the lens groups are spliced or installed in the same mounting seat to form a complete double telecentric imaging system optical path structure. In the design of the lens barrel structure of the traditional double telecentric imaging system, there are many types of parts, the structure is complex, the installation process is tedious and inefficient, and the image quality of the double telecentric imaging lens groups produced in the same batch differs greatly. SUMMARY

[0004] The purpose of the present application is to provide a lens barrel mechanism suitable for a double telecentric imaging system, which solves the technical problems of the traditional double telecentric imaging system in the prior art, such as many types of parts, complex structure, tedious and inefficient installation process, etc.

[0005] The present application provides a lens barrel mechanism suitable for a double telecentric imaging system, which comprises a lens barrel body, and the lens barrel body is formed with a plurality of mounting holes arranged in sequence and continuously along a first predetermined direction, and the first predetermined direction penetrates through the opposite ends of the lens barrel body, and the plurality of mounting holes are arranged according to the rule of decreasing first and then increasing in diameter along the first predetermined direction, so as to form a continuous stepped hole.

[0006] In the technical solution, further, the part of the mounting holes are lens mounting holes, and are used for mounting lenses; and the mounting holes adjacent to the outer side of the lens mounting holes and having a larger inner diameter than the lens mounting holes are threaded holes, and are used for mounting threaded compression rings to compress the lenses.

[0007] In any of the above technical solutions, further, a side wall of the mounting hole between every two adjacent lens mounting holes is formed with an exhaust through hole.

[0008] In any of the above technical solutions, further, a side wall of at least part of the lens mounting holes is formed with an adjusting threaded hole.

[0009] In any of the above technical solutions, further, an inner wall of the part of the mounting holes is provided with a light extinction thread.

[0010] In any of the above technical solutions, further, an inner wall of the mounting hole of the middle part of the lens barrel body is provided as a large-aperture diaphragm.

[0011] In any of the above technical solutions, further, the mounting hole adjacent to the large-aperture diaphragm and having a larger inner diameter than the large-aperture diaphragm among the plurality of mounting holes is a small-aperture diaphragm mounting hole, and is used for mounting a small-aperture diaphragm; and the mounting hole adjacent to the outer side of the small-aperture diaphragm mounting hole and having a larger inner diameter than the small-aperture diaphragm mounting hole is a threaded hole, and is used for mounting a threaded compression ring to compress the small-aperture diaphragm.

[0012] In any of the above technical solutions, further, the mounting holes on the opposite sides of the large-aperture diaphragm are symmetrically arranged with respect to the large-aperture diaphragm.

[0013] In any of the above technical solutions, further, at least one end of the lens barrel body is formed with a mounting interface, and an inner wall of the mounting interface is provided with a support part; or at least one end of the lens barrel body is formed with a mounting interface, and a support frame is arranged in the mounting interface.

[0014] The application further provides an optical lens assembly comprising a plurality of lenses and the lens barrel mechanism suitable for a dual-telecentric imaging system according to any of the above technical solutions, wherein the plurality of lenses are sequentially and spacedly arranged in the plurality of mounting holes one by one along the first preset direction. Thus, the lens barrel mechanism suitable for a dual-telecentric imaging system has all the beneficial technical effects, which will not be described herein again.

[0015] In the technical solution, further, the number of the lenses is six, and along the first preset direction, they are respectively a single lens, a meniscus lens, a doublet lens, a doublet lens, a meniscus lens, and a single lens.

[0016] Compared with the prior art, the application has the following beneficial effects: In the application, according to the characteristics of the optical path of the double telecentric imaging system, a continuous stepped hole that is set according to the rule of decreasing first and then increasing in the inner diameter is integrally processed on the lens barrel body, as a mounting groove of the lens in the optical path of the double telecentric imaging system, and then the lenses do not need to be grouped, mounted and integrated, and through reasonable optimization of the machining tolerance of the lens barrel structure, the assembly precision of the lenses is ensured by the machining precision of the lens barrel structure itself, and finally the adjustment after the lenses are mounted in the integration stage is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific embodiments or the prior art of the application, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 The structure schematic diagram of the lens barrel body provided by the embodiment of the application is shown in the figure. Figure 2 Another structure schematic diagram of the lens barrel body provided by the embodiment of the application is shown in the figure. Figure 3 The structure schematic diagram of the optical lens assembly provided by the embodiment of the application is shown in the figure. Figure 4 The optical path diagram of the optical lens assembly provided by the embodiment of the application is shown in the figure. Figure 5 Another optical path diagram of the optical lens assembly provided by the embodiment of the application is shown in the figure.

[0019] Reference signs: 1-lens barrel body, 11-mounting hole, 111-lens mounting hole, 112-threaded hole, 113-vent hole, 114-adjusting threaded hole, 115-extinction thread, 116-large aperture diaphragm, 117-small aperture diaphragm mounting hole, 12-mounting interface, 2-lens, 21-large aperture single lens, 22-medium aperture mirror, 23-small aperture double cemented lens, 3-threaded compression ring, 4-small aperture diaphragm, a-first preset direction. DETAILED DESCRIPTION

[0020] The technical solutions of the application will be described in detail below with reference to the drawings. Obviously, the described embodiments are some embodiments of the application, not all embodiments.

[0021] The components of the application embodiments, which are described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Therefore, the following detailed description of the embodiments of the application, as provided in the figures, is not intended to limit the scope of the application, but is merely representative of selected embodiments of the application.

[0022] Based on the embodiments herein, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0023] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0025] The following refers to Figures 1 to 5 The barrel mechanism and optical lens assembly suitable for a dual-telecentric imaging system according to some embodiments of the application are described.

[0026] Embodiment one Referring to Figures 1 to 4 As shown in the drawings, the embodiments of the application provide a barrel mechanism suitable for a dual-telecentric imaging system, which comprises a barrel body 1, the barrel body 1 is formed with a plurality of mounting holes 11 arranged in sequence along a first predetermined direction a, and the opposite ends of the barrel body 1 are penetrated along the first predetermined direction a, that is, along the first predetermined direction a, the first mounting hole 11 and the last mounting hole 11 penetrate the opposite ends of the barrel body 1 respectively, so that the barrel body 1 has a through-hole structure along the first predetermined direction a; the plurality of mounting holes 11 are arranged according to the rule of decreasing first and then increasing the inner diameter along the first predetermined direction a, to form a continuous stepped hole.

[0027] According to the above-described structure, according to the characteristics of the optical path of the dual-telecentric imaging system, a continuous stepped hole that decreases first and then increases according to the inner diameter is integrally processed on the lens barrel body 1 as the mounting groove of the lens 2 in the optical path of the dual-telecentric imaging system, and further, without grouping and installing the lens 2, through reasonable optimization of the machining tolerance of the "lens barrel structure", the assembly precision of each lens 2 is ensured by the machining precision of the "lens barrel structure" itself, and finally the adjustment-free installation of the lens 2 after integration is realized.

[0028] Moreover, when installing the lens 2, first, the small-aperture lens 2 close to the smallest inner diameter size of the mounting hole 11, that is, the aperture stop, is installed on the same side (object side / image side), and then the large-aperture lens 2 far from the aperture stop is installed, and the assembly sequence will not produce any interference in the assembly process, and the operation is simple and convenient.

[0029] Further, preferably, the first preset direction a is the thickness direction of the lens 2, the propagation direction of the light, and the length direction of the lens barrel body 1.

[0030] In this embodiment, preferably, as shown in Figure 1 and Figure 3 , wherein part of the mounting hole 11 is a lens mounting hole 111, and is used to install the lens 2, and the mounting hole 11 adjacent to the outside of the lens mounting hole 111 and having a larger inner diameter than the lens mounting hole 111 is a threaded hole 112, and is used to install a threaded compression ring 3 to compress the lens 2. According to the above-described structure, during integration, first, the small-aperture lens 2 close to the aperture stop is installed on the same side (object side / image side), and then the large-aperture lens 2 far from the aperture stop is installed, and the assembly sequence of the lens 2 on the same side (object side / image side) is installed into the corresponding lens mounting hole 111 of the lens barrel, and the threaded compression ring 3 is used to fix each lens 2, and then other auxiliary structural members are installed and integrated, and finally a complete dual-telecentric imaging lens is formed.

[0031] Further, preferably, the outer wall of the threaded compression ring 3 is provided with threads, and is threadedly connected with the threaded hole 112, and by screwing the threaded compression ring 3, the lens 2 can be finally compressed.

[0032] Further, preferably, as shown in Figure 3 and Figure 4 , along the first preset direction a, the inside of the lens barrel body 1 can be sequentially installed with a large-aperture single lens 21, a medium-aperture moon lens 22, a small-aperture double-cemented lens 23, a small-aperture aperture stop 4, a small-aperture double-cemented lens 23, a medium-aperture moon lens 22, and a large-aperture double-cemented lens, and further form Figure 1The optical path within the lens barrel 1, of course, includes the type, structure, and number of internally installed lenses 2, as well as the structure and arrangement order of the aperture stops, which are not limited to the above. Correspondingly, the structure, number, and arrangement order of the mounting holes 11 within the lens barrel 1 are not limited to the above and can be selected according to actual needs. For example, they can also be arranged according to... Figure 5 The optical path in the lens barrel 1 is modified accordingly to change the structure, number and arrangement of the mounting holes 11 inside the lens barrel 1. Of course, this is just another example, and it is not limited to this. It can also be selected according to actual needs.

[0033] It should be noted that multiple mounting holes 11 form a complete stepped hole structure along the first preset direction a, and a stepped surface is formed between two adjacent mounting holes 11, so that the stepped surface can play the role of supporting the lens 2.

[0034] In this embodiment, preferably, as follows: Figure 2 As shown, a vent hole 113 is formed on the side wall of the mounting hole 11 between every two adjacent lens mounting holes 111. The two ends of the vent hole 113 are connected to the mounting hole 11 and the outside of the lens barrel body 1, respectively. As can be seen from the structure described above, due to the strict tolerance design between the lens 2 and the lens mounting hole 111, air may not be able to escape between adjacent lenses 2 during the installation process, resulting in the lens 2 not being able to be installed properly. Therefore, in this application, an vent hole 113 is provided on the side wall of the mounting hole 11 between two adjacent lenses 111, thereby enabling the lens 2 to be installed properly. Of course, this is not the only option; the vent hole 113 may not be provided, depending on the actual needs.

[0035] Furthermore, preferably, the sidewalls of all adjacent mounting holes 111 between two lens mounting holes 111 are provided with venting holes 113. Of course, this is not the only option; it is also possible to provide venting holes 113 only for a portion of the mounting holes 111 between two adjacent lens mounting holes 111, depending on the actual needs.

[0036] In this embodiment, preferably, as follows: Figure 1 As shown, at least a portion of the lens mounting hole 111 has an adjustment threaded hole 114 formed on its sidewall. According to the above-described structure, the lens barrel structure undergoes several iterations of machining tolerance tightening processes, and finally realizes that only the machining tolerance of the lens barrel structure can ensure that each lens 2 is installed in place, so that the actual assembly error of each lens 2 (the air gap tolerance between the lenses 2, the eccentricity tolerance of the lenses 2, and the tilt tolerance of the lenses 2) is within the required range. During the development of the iterative machining tolerance, individual lenses 2 may still need to be fine-tuned for eccentricity or tilt due to tolerance reasons. Therefore, adjustment screw holes 114 for fine-tuning the position of the lenses 2 are designed on the side of each lens mounting hole 111 in the lens barrel structure. Then, adjustment screws, adjustment bolts or other instruments can be used to contact the lenses 2 through the adjustment screw holes 114, thereby pushing the lenses 2 to move and fine-tune the lenses 2. When the tolerance iteration is completed, these adjustment screw holes 114 will not be used. In this embodiment, preferably, as shown in FIG. 1, the inner wall of the mounting hole 11 is provided with an anti-glare thread 115 for eliminating stray light. Figure 1 It should be noted that the anti-glare thread 115 can be designed or not designed according to the actual light path in other embodiments designed by designers in the field according to the actual light path. That is, the anti-glare thread 115 can also not be provided.

[0037] In addition, it should be noted that the form of the anti-glare thread 115 (for example, a conical thread, a cylindrical thread, etc.) and the position of the anti-glare thread 115 in the light path can be selected according to actual needs.

[0038] In addition, it should be noted that the anti-glare thread 115 can be integrally machined with the lens barrel body 1, of course, not limited thereto. The anti-glare thread 115 can be machined as a separate part according to the actual light path in other embodiments designed by designers in the field according to the actual light path. That is, an anti-glare member is designed, the anti-glare thread 115 is machined on the anti-glare member, and then the anti-glare member is installed in the corresponding mounting hole 11.

[0039] In this embodiment, preferably, as shown in FIG. 1, the inner wall of the mounting hole 11 is provided with an anti-glare thread 115 for eliminating stray light. Figure 1 It should be noted that the anti-glare thread 115 can be designed or not designed according to the actual light path in other embodiments designed by designers in the field according to the actual light path. That is, the anti-glare thread 115 can also not be provided. According to the above-described structure, the lens barrel structure undergoes several iterations of machining tolerance tightening processes, and finally realizes that only the machining tolerance of the lens barrel structure can ensure that each lens 2 is installed in place, so that the actual assembly error of each lens 2 (the air gap tolerance between the lenses 2, the eccentricity tolerance of the lenses 2, and the tilt tolerance of the lenses 2) is within the required range. During the development of the iterative machining tolerance, individual lenses 2 may still need to be fine-tuned for eccentricity or tilt due to tolerance reasons. Therefore, adjustment screw holes 114 for fine-tuning the position of the lenses 2 are designed on the side of each lens mounting hole 111 in the lens barrel structure. Then, adjustment screws, adjustment bolts or other instruments can be used to contact the lenses 2 through the adjustment screw holes 114, thereby pushing the lenses 2 to move and fine-tune the lenses 2. When the tolerance iteration is completed, these adjustment screw holes 114 will not be used.

[0040] In this embodiment, preferably, as shown in FIG. 1, the inner wall of the mounting hole 11 is provided with an anti-glare thread 115 for eliminating stray light. Figure 1 andFigure 3 As shown in FIG. 1, the mounting holes 11 adjacent to the large aperture diaphragm 116 and having an inner diameter greater than the large aperture diaphragm 116 are small aperture diaphragm mounting holes 117, for example, cylindrical holes, and are used for mounting the small aperture diaphragm 4 (the central hole of the small aperture diaphragm is a conical hole), and the mounting holes 11 adjacent to the outer side of the small aperture diaphragm mounting holes 117 and having an inner diameter greater than the small aperture diaphragm mounting holes 117 are threaded holes 112, and are used for mounting the threaded compression ring 3 to compress the small aperture diaphragm 4. According to the structure described above, the small aperture diaphragm 4 can limit the beam diameter and reduce the light flux, and the processed small aperture diaphragm 4 is mounted in the corresponding small aperture diaphragm mounting hole 117 and compressed by the threaded compression ring 3. Of course, it is not limited to this, and the small aperture diaphragm 4 can also be directly integrated with the lens barrel body 1, which is selected according to actual needs.

[0041] It should be noted that: it is not limited to this, and only the small aperture diaphragm 4 or the large aperture diaphragm 116 can be provided, which is selected according to actual needs, and in addition, the number of small aperture diaphragms 4 and large aperture diaphragms 116 can also be selected according to actual needs.

[0042] In this embodiment, preferably, as shown in FIG. 1, Figure 1 and Figure 4 the mounting holes 11 on the opposite sides of the large aperture diaphragm 116 are symmetrically arranged with respect to the large aperture diaphragm 116. According to the structure described above, the object side structure of the lens barrel structure is symmetrically arranged with the side light path with respect to the large aperture diaphragm 116, at this time, the magnification of the double-telecentric imaging system can be 1, and the symmetric processing is convenient for processing and manufacturing, which improves the manufacturing efficiency, of course, it is not limited to this, the magnification of the double-telecentric imaging system can also be other values, at this time, the object side structure of the lens barrel structure is asymmetric with respect to the large aperture diaphragm 116 with the side light path, as shown in FIG. 2. Figure 5

[0043] In this embodiment, preferably, as shown in FIG. 1, Figure 1 at least one end of the lens barrel body 1 is formed with a mounting interface 12, and the inner wall of the mounting interface 12 is provided with a support portion.

[0044] ​According to the above-described structure, the mounting interface 12 can be designed on the light entrance side and / or the light exit side of the lens barrel, which can be used to mount the optical element such as a mirror or a prism for changing the direction of light path propagation, and the mirror or the prism is directly fixed on the support part without the need for later assembly, saving time and effort. Of course, it is not limited to this, and the relevant designers in the field can consider whether to design a mirror or prism mounting surface according to their own light path conditions in other embodiments designed according to their own light path conditions; consider the angle and orientation of the designed mirror mounting surface or prism mounting surface; consider directly integrating the support part in the mounting interface 12, or assembling a support frame in the mounting interface 12, and fixing the mirror or prism on the support frame. The specific selection is based on actual needs.

[0045] Of course, it is not limited to this, and other structures can also be used, for example: at least one end of the lens barrel body 1 is formed with a mounting interface 12, and a support frame is arranged in the mounting interface 12. Embodiment Two As shown in Figure 3 The embodiment two of the present application also provides an optical lens assembly, which comprises the lens barrel mechanism suitable for a double-telecentric imaging system described in the above embodiment one, so that the optical lens assembly has all the beneficial technical effects of the lens barrel mechanism suitable for a double-telecentric imaging system. The same technical features and beneficial effects will not be described again.

[0046] In this embodiment, preferably, as shown in Figure 3 The number of the lens 2 is six, and along the first preset direction a, they are respectively a single lens, i.e., the aforementioned large-aperture single lens 21, a meniscus lens, i.e., the aforementioned medium-aperture meniscus lens 22, a double-cemented lens, i.e., the aforementioned large-aperture double-cemented lens, a double-cemented lens, i.e., the aforementioned large-aperture single lens 21, a meniscus lens, i.e., the aforementioned medium-aperture meniscus lens 22, and a single lens, i.e., the aforementioned large-aperture single lens 21. It can be seen that the object side structure of the "lens barrel structure" of the optical lens assembly, i.e., the double-telecentric imaging system, and the side light path are symmetrically arranged relative to the diaphragm plane, and the magnification of the optical lens assembly, i.e., the double-telecentric imaging system, is 1. Of course, it is not limited to this, and the magnification can also be other values. At this time, the object side structure of the "lens barrel structure" and the side light path are asymmetrically arranged relative to the diaphragm plane (as shown in Figure 5 Of course, this is only an example, and it is not limited to this. The specific design is based on actual needs.

[0047] It should be noted that the number of the lens 2 is not limited to six, and can be less than six, such as four or five, or more than six, such as seven or eight. The arrangement order of the plurality of lenses 2 can also be selected according to actual needs.

[0048] In addition, it should be noted that the type of each lens 2 is not limited to a single lens, a meniscus lens, or a doublet lens, but can be any lens 2 having any radius of curvature (i.e., the radius of curvature of the light passing surface of the lens 2), which is selected according to actual needs.

[0049] In this embodiment, as shown in Figure 3 the optical lens assembly further comprises a threaded retainer 3, wherein each lens 2 is provided with a threaded retainer 3, the threaded retainer 3 is installed in the corresponding threaded hole 112, and the threaded retainer 3 can press the lens 2 against the step surface, thereby fixing the lens 2.

[0050] In this embodiment, as shown in Figure 3 the optical lens assembly further comprises a small-aperture diaphragm 4, and the small-aperture diaphragm 4 is installed in the corresponding mounting hole 11 and is provided with the threaded retainer 3, the threaded retainer 3 is installed in the corresponding threaded hole 112, and the threaded retainer 3 can press the small-aperture diaphragm 4 against the step surface, thereby fixing the small-aperture diaphragm 4.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacement for part or all of the technical features; and such modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lens barrel mechanism suitable for a dual telecentric imaging system, characterized in that, The lens includes a lens barrel body, and the lens barrel body has a plurality of mounting holes arranged sequentially along a first preset direction, and the mounting holes extend through opposite ends of the lens barrel body along the first preset direction. The plurality of mounting holes are arranged along the first preset direction according to the rule that the inner diameter first decreases and then increases, so as to form a continuous stepped hole.

2. The lens barrel mechanism for a dual telecentric imaging system according to claim 1, characterized in that, Some of the mounting holes are lens mounting holes and are used to mount lenses. The mounting holes adjacent to the outer side of the lens mounting holes and having an inner diameter larger than the lens mounting holes are threaded holes and are used to mount threaded pressure rings to press the lenses together.

3. The lens barrel mechanism for a dual telecentric imaging system according to claim 2, characterized in that, Vent holes are formed on the sidewalls of the mounting holes between each pair of adjacent lens mounting holes.

4. The lens barrel mechanism for a dual telecentric imaging system according to claim 2, characterized in that, At least a portion of the sidewalls of the lens mounting holes are formed with adjustment threaded holes.

5. The lens barrel mechanism for a dual telecentric imaging system according to claim 1, characterized in that, Some of the mounting holes have matte threads on their inner walls.

6. The lens barrel mechanism for a dual telecentric imaging system according to claim 1, characterized in that, The inner wall of the mounting hole in the middle of the lens barrel body is configured as a large-diameter aperture.

7. The lens barrel mechanism for a dual telecentric imaging system according to claim 6, characterized in that, Among the plurality of mounting holes, the mounting hole adjacent to the large-diameter aperture and having an inner diameter larger than the large-diameter aperture is a small-diameter aperture mounting hole and is used to mount the small-diameter aperture. The mounting hole adjacent to the outer side of the small-diameter aperture mounting hole and having an inner diameter larger than the small-diameter aperture mounting hole is a threaded hole and is used to mount a threaded pressure ring to tighten the small-diameter aperture; and / or The mounting holes on opposite sides of the large-diameter aperture are symmetrically arranged with respect to the large-diameter aperture.

8. The lens barrel mechanism for a dual telecentric imaging system according to claim 1, characterized in that, At least one end of the lens barrel body is provided with a mounting interface, and the inner wall of the mounting interface is provided with a support portion; or at least one end of the lens barrel body is provided with a mounting interface, and a support frame is provided inside the mounting interface.

9. An optical lens assembly, characterized in that, It includes multiple lenses and a lens barrel mechanism suitable for a dual telecentric imaging system as described in any one of claims 1 to 8; wherein the multiple lenses are sequentially spaced along the first preset direction in a plurality of corresponding mounting holes.

10. The optical lens assembly according to claim 9, characterized in that, The number of lenses is six, and along the first preset direction, they are respectively a single lens, a meniscus, a cemented doublet, a cemented doublet, a meniscus, and a single lens.

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