A lens assembly with split lens and its assembling method

Abstract

The present application relates to the technical field of lens assembly, and provides a lens assembly with split lenses and an assembling method thereof, the lens assembly comprises a plurality of split lenses connected in sequence, each split lens comprises a lens barrel, an eyepiece end and a closed end, a through slot is arranged between the eyepiece end and the closed end, a first assembling surface is arranged on the outer wall surface of the lens barrel, adjacent split lenses are connected and fixed through the first assembling surface, and a second assembling surface is arranged in the through slot; a lens frame is arranged in the through slot, a third assembling surface is arranged on the outer wall surface of the lens frame, and the third assembling surface is arranged on the second assembling surface; and a first lens is arranged in the lens frame, the outer wall surface of the lens barrel and the through slot are tapered to form the first assembling surface and the second assembling surface, the outer diameter of the lens frame is tapered to form the third assembling surface, the thickness of the lens barrel is compensated under the premise of ensuring the through aperture, the stability of the connection between the lens barrel and the lens frame and the connection between the lens frame and the lens is maintained, and the optical system is ensured to have high precision.

Description

Technical Field

[0001] This invention relates to the field of lens assembly technology, and more specifically, to a lens assembly with separate lenses and its assembly method. Background Technology

[0002] The lens assembly is the core component of an optical system and is widely used in various optical devices such as cameras, video cameras, microscopes, and telescopes. A lens assembly consists of multiple optical elements, each with a specific function, working together to achieve high-quality imaging.

[0003] In the prior art, a lens assembly includes a lens barrel, a lens frame, and lenses. The lenses are mounted in the lens barrel through the lens frame. When multiple lenses in the lens assembly are arranged angularly adjacent, the adjacent lens barrel structures need to be processed to ensure that the lens assembly can be assembled. However, this also means that the internal space of the lens barrel needs to be reduced after processing. Traditional lens frame structures are not suitable for mounting in such lens barrels and cannot be adapted to the space of the lens barrel, resulting in the inability to meet the design requirement of separate lenses being arranged angularly adjacent.

[0004] Therefore, existing technologies still need improvement and development. Summary of the Invention

[0005] The purpose of this invention is to provide a lens assembly with separate lenses and its assembly method, so as to solve the technical problem of poor compatibility between components in separate lenses.

[0006] To achieve the above objectives, a first aspect of the present invention provides a lens assembly with separate lenses, comprising a plurality of separate lenses connected in sequence, wherein the separate lenses include:

[0007] The lens barrel includes an eyepiece end and a constricted end, with a through groove between the eyepiece end and the constricted end. A first mounting surface is provided on the outer wall of the lens barrel, and adjacent split lenses are connected and fixed through the first mounting surface. The first mounting surface extends from the middle of the lens barrel to the constricted end, and the perpendicular distance between the first mounting surface and the optical axis of the lens barrel gradually decreases in the direction of extension of the first mounting surface. A second mounting surface is provided in the through groove.

[0008] A mirror frame is installed in the through groove, and a third mounting surface is provided on the outer wall of the mirror frame. The third mounting surface is installed on the second mounting surface.

[0009] The first lens is installed inside the frame.

[0010] Furthermore, a receiving platform is provided on the end face of the closing end, and a bearing groove is provided on the receiving platform along the circumference of the closing end. A second lens is engaged in the bearing groove. An avoidance opening is provided on the receiving platform at the position of the first mounting surface. When the second lens is engaged in the bearing groove, the second lens is exposed outside the avoidance opening and has a first gap with the first mounting surface. In addition, the side end face of the second lens protrudes from the platform surface of the receiving platform.

[0011] Furthermore, the frame includes multiple sub-frames, which are stacked along the optical axis of the through slot, and the third mounting surface is provided on the outer side wall of at least the sub-frame near the closing end.

[0012] In some embodiments, the first mounting surface is an inclined plane, and multiple first mounting surfaces are arranged along the circumference of the split lens.

[0013] Furthermore, the plane perpendicular to the optical axis of the split lens is a reference plane, and the angle between the first mounting surface and the reference plane is 150°-165°.

[0014] In some embodiments, an adhesive layer is also included, through which the first mounting surfaces of adjacent split lenses are bonded and fixed.

[0015] Furthermore, an installation gap is provided between the first mounting surfaces of adjacent split lenses, the installation gap being used to apply the adhesive layer.

[0016] In some embodiments, the second mounting surface and the third mounting surface are bonded together by the adhesive layer.

[0017] A second aspect of the present invention provides a method for assembling a lens assembly, for assembling a lens assembly with separate lenses as described in the above embodiments, the assembly method comprising the following steps:

[0018] Step S1: Assemble the second lens into the lens barrel, adjust the offset and tilt between the second lens and the lens barrel, using the bottom end face and outer diameter of the lens barrel as a reference, ensure that the offset is less than 10um and the tilt is less than 30 seconds, and then apply glue to the gap between the second lens and the lens barrel.

[0019] Step S2: Apply adhesive to the gap between the side of the first lens and the lens barrel support groove for curing and connection. After curing and stabilization, apply adhesive to the gaps between all the first lenses and the lens barrel to seal the end and ensure the cleanliness of the internal environment of the optical system.

[0020] Step S3: After combining the first lens with the corresponding sub-frame, perform centering machining to ensure that the relative tilt between the optical axis of the first lens and the mechanical axis of the sub-frame is less than 30 seconds and the offset is less than 10µm. Apply adhesive and cure until the connection between the first lens and the sub-frame is stable.

[0021] Step S4: Insert the first lens and sub-frame, which have been cured and connected in step S2, into the lens barrel completed in step S3. The bottom end of the lens frame is embedded and fitted with the corresponding support platform of the lens barrel. Adjust the relative tilt between the optical axis of the first lens and the optical axis of the optical system it forms to less than 30 seconds and the offset to less than 10um. Use adhesive to cure the three components and make them stably connected to the lens barrel. Tighten the locking ring and press it in.

[0022] In some embodiments, step S1 further includes: placing a shim at the bottom of the first lens and the support platform of the lens barrel to adjust the relative tilt, and placing a feeler gauge between the outer diameter of the first lens and the inner diameter of the support groove of the lens barrel to control the relative offset.

[0023] The beneficial effects of the lens assembly with split lenses and its assembly method provided by the present invention are at least as follows: the outer wall surface and the through groove of the lens barrel are tapered to form a first assembly surface and a second assembly surface, respectively; the outer diameter of the lens frame is tapered; and the outer diameter of the lens frame is cut to form a tapered third assembly surface. This compensates for the thickness of the lens barrel while ensuring the through diameter, maintains the stability of the connection between the lens barrel and the lens frame, as well as between the lens frame and the lens, and designs a tight connection structure within a limited space to ensure stability and high precision of the optical system. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, 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 these drawings without creative effort.

[0025] Figure 1 A perspective view of a lens assembly with split lenses provided for an embodiment of the present invention;

[0026] Figure 2 A perspective view of the split lens provided in an embodiment of the present invention;

[0027] Figure 3 for Figure 2 A stereoscopic view of a split-type lens from another perspective;

[0028] Figure 4 for Figure 2 A front view of a split-type lens;

[0029] Figure 5 for Figure 4 A cross-sectional view of the split-type lens in the BB direction;

[0030] Figure 6 A flowchart illustrating the assembly method of the lens assembly provided in an embodiment of the present invention.

[0031] The following are the labeling elements in the figure:

[0032] 1. Lens assembly;

[0033] 2. Split-camera setup;

[0034] 3. Lens tube; 31. Eyepiece end; 32. Retracting end; 33. Through groove; 34. First mounting surface; 35. Second mounting surface;

[0035] 4. Frame; 41. Third mounting surface; 42. Second lens; 43. Clearance opening; 44. Sub-frame; 45. First lens;

[0036] 5. Receiving platform; 51. Bearing groove. Detailed Implementation

[0037] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0039] A first aspect of the present invention provides a lens assembly with a split lens. The lens assembly with a split lens according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0040] Please see Figure 1 , Figure 1A perspective view of the lens assembly with split lenses of the present invention is shown. The lens assembly 1 includes a plurality of split lenses 2 connected in sequence, wherein adjacent split lenses 2 are arranged at an angle. It is understood that the lens barrels 3 of the prior art are all conventional lens barrels 3. When multiple lenses need to be arranged at an angle due to design requirements, the structure of the lens barrel 3 in adjacent lenses needs to be modified, and the internal space of the lens barrel 3 after modification needs to be reduced in order to allow the multiple split lenses 2 to be arranged at an angle.

[0041] Therefore, without any modifications, the conventional lens barrel 3 and lens frame 4 are not suitable for mounting in such a lens barrel 3. In other words, if modifications are needed for lens barrels 3 that are set at an angle, the conventionally used lens frame 4 is not applicable. However, if the lens is modified, the space left by the modified lens barrel 3 cannot meet the installation requirements of the conventional lens frame 4.

[0042] The structure of the lens barrel 3 and lens frame 4 in the lens group 1 with the split lens 2 proposed in this invention has been improved. The lens frame 4 can be stably and accurately installed into the lens barrel 3 while being set at an angle, thus meeting the product requirements.

[0043] See Figures 1-5 The split lens 2 includes a lens barrel 3, a lens frame 4, and a first lens element 45, which is mounted in the lens barrel 3 via the lens frame 4.

[0044] Continue reading Figures 1-5 The lens barrel 3 includes an eyepiece end 31 and a constriction end 32. A through groove 33 is provided between the eyepiece end 31 and the constriction end 32. A first mounting surface 34 is provided on the outer wall surface of the lens barrel 3. Adjacent split lenses 2 are connected and fixed through the first mounting surface 34. The first mounting surface 34 extends from the middle of the lens barrel 3 to the constriction end 32. In the direction of extension of the first mounting surface 34, the vertical distance between the first mounting surface 34 and the optical axis of the lens barrel 3 gradually decreases. A second mounting surface 35 is provided in the through groove 33.

[0045] In this embodiment, the second assembly surface 35 is parallel to the first assembly surface 34. Of course, the second assembly surface 35 may not be parallel to the first assembly surface 34. Preferably, in this embodiment, the second assembly surface 35 is parallel to the first assembly surface 34.

[0046] See Figures 1-5 The frame 4 is installed in the through groove 33, and a third mounting surface 41 is provided on the outer wall of the frame 4. The third mounting surface 41 is installed on the second mounting surface 35. The first lens 45 is installed in the frame 4.

[0047] In order to meet the requirements of angled setting, the lens barrel 3 of this application has a first mounting surface 34 on its outer wall surface. That is, the outer diameter of the lens barrel 3 is tapered. When the adjacent split lenses 2 are set at an angle, the first mounting surface 34 of the adjacent lens barrel 3 is pressed and fixed, so as to form a lens group 1 with multiple angled split lenses 2.

[0048] Furthermore, since the outer wall of the lens barrel 3 is tapered, if the inner wall of the lens barrel 3 is not treated, the thickness of the lens barrel 3 at the first assembly surface 34 will be reduced, thereby decreasing the structural strength of the lens barrel 3 and affecting the structural strength of the assembled lens assembly 1. Therefore, structural treatment is also applied to the inner wall of the lens barrel 3, see [reference needed]. Figure 5 A second mounting surface 35 parallel to the first mounting surface 34 is provided in the through groove 33 of the lens barrel 3. In this way, each position of the lens barrel 3 can have the same thickness, and the structural strength of the lens barrel 3 is guaranteed.

[0049] Meanwhile, because the inner wall of the through groove 33 of the lens barrel 3 has a second mounting surface 35, the diameter of the through groove 33 is inconsistent with that of the second mounting surface 35 and other wall surfaces. If a conventional lens frame 4 is used directly, the shape of the conventional lens frame 4 will not match the lens barrel 3 of this application. To address this, the lens frame 4 of this application is tapered, and a third mounting surface 41 is provided on the outer wall of the lens frame 4. The third mounting surface 41 is adapted to the second mounting surface 35. When the lens frame 4 is installed inside the lens barrel 3, the third mounting surface 41 is fixedly mounted on the second mounting surface 35, while the other outer wall surfaces of the lens frame 4 are tightly fixed to the inner wall of the through groove 33 except for the second mounting surface 35. This allows the lens frame 4 and the lens barrel 3 of this application to be precisely fitted and installed.

[0050] The outer wall surface of the lens barrel 3 and the through groove 33 are tapered to form the first mounting surface 34 and the second mounting surface 35, respectively. The outer diameter of the lens frame 4 is tapered, and the outer diameter of the lens frame 4 is cut to form a tapered third mounting surface 41. This compensates for the thickness of the lens barrel 3 while ensuring the through diameter, and maintains the stability of the connection between the lens barrel 3 and the lens frame 4, as well as between the lens frame 4 and the lens. A tight connection structure is designed in a limited space to ensure stability and high precision of the optical system.

[0051] Further, see Figures 1-5 The first assembly surface 34 is an inclined plane. Two first assembly surfaces 34 are arranged along the circumference of the split lens 2. Similarly, the second assembly surface 35 and the third assembly surface 41 are also inclined planes and correspond to the positions of the first assembly surface 34.

[0052] Each split lens 2 has two first mounting surfaces 34 symmetrical about the central axis of the lens barrel 3. Both first mounting surfaces 34 are inclined planes formed by cutting. The inclination here means that there is a certain angle between the first mounting surface 34 and the optical axis of the lens barrel 3. When installing the split lens 2, the first mounting surfaces 34 of two adjacent lens barrels 3 are pressed together and then the pressed position is reinforced. In this way, a certain angle is formed between the optical axes of two adjacent lens barrels 3. Similarly, other split lenses 2 can be pressed together and fixed in the same way, thus realizing the angled setting of multiple split lenses 2.

[0053] In some implementations, the number of first mounting surfaces 34 provided on each split lens 2 can be three, four or more. For example, when each lens barrel 3 of each split lens 2 is provided with three first mounting surfaces 34, then each lens barrel 3 can be connected to three other lens barrels 3 to realize more angled settings.

[0054] Furthermore, when the outer wall surface of the lens barrel 3 is wedge-shaped, the first mounting surface 34 extends to more than half of the side of the lens barrel 3. In this way, the area of ​​the first mounting surface 34 is larger, and when multiple lens barrels 3 are joined together, there can be a larger bonding and fixing area, and the connection between the lens barrels 3 is more stable.

[0055] In some embodiments, the plane perpendicular to the optical axis of the split lens 2 is used as the reference plane, and the angle between the first mounting surface 34 and the reference plane is 150°-165°. Assuming the straight line containing the optical axis is the Z-axis in a triangular coordinate system, the reference plane is the plane where the X and Y axes lie. The angle formed by the extended first mounting surface 34 and the reference plane can be 150°-165°. The specific angle setting is determined according to actual needs. It should be noted that the angle refers to the angle in the direction away from the lens along the Z-axis.

[0056] For example, the angle between the first mounting surface 34 and the reference surface can be 150°, 155°, 160°, or 165°. Correspondingly, the angles between two adjacent lens barrels 3 are 60°, 50°, 40°, or 30°, respectively. The cutting angle range of the wedge-shaped inclined surface ensures that the lenses are in the range of 30° to 60°.

[0057] In some embodiments, the lens assembly 1 further includes an adhesive layer (not shown in the figure), which is a surface layer formed by curing an adhesive, and the first mounting surfaces 34 of adjacent split lenses 2 are bonded and fixed together by the adhesive layer.

[0058] Furthermore, adhesive layers are used to firmly bond two or more surfaces together, ensuring good bonding and long-term stability between materials, including but not limited to epoxy resin adhesives, acrylic adhesives, polyurethane adhesives, and hot melt adhesives.

[0059] When assembling two adjacent lens barrels 3, an adhesive layer is applied to the first mounting surface 34 of the two lens barrels 3. At this time, the adhesive layer is liquid or semi-solid. Then, the first mounting surfaces 34 of the two adjacent lens barrels 3 are pressed together. After the adhesive layer is dried and cured, a solid adhesive layer is formed. At this time, the two lens barrels 3 are also bonded and fixed by the adhesive layer.

[0060] Furthermore, an installation gap (not shown in the figure) is provided between the first mounting surfaces 34 of adjacent split lenses 2, and the installation gap is used to apply an adhesive layer.

[0061] Understandably, the adhesive layer itself has a certain thickness, and the installation gap is used to provide space for the adhesive layer to be applied. Among them, when each lens barrel 3 is installed and positioned, an adjustment gap of 1-2mm is reserved between two adjacent wedge-shaped inclined surfaces (first assembly surface 34).

[0062] The individual lenses 2 are adjusted and tilted relative to each other by means of a bracket. After the adjustment is completed, glue is applied to the first assembly surface 34 to fix the adjacent individual lenses 2 to each other. The gap between the first assembly surfaces 34 is also a space reserved for adjustment.

[0063] Furthermore, the second assembly surface 35 and the third assembly surface 41 are also bonded together by an adhesive layer, and the bonding method is the same as that between the first assembly surfaces 34.

[0064] In some implementations, see Figures 1-5 The end face of the constriction end 32 is provided with a receiving platform 5. The receiving platform 5 is provided with a bearing groove 51 along the circumference of the constriction end 32. The second lens 42 is snapped in the bearing groove 51. The receiving platform 5 is provided with a clearance opening 43 at the position of the first mounting surface 34. When the second lens 42 is snapped in the bearing groove 51, the second lens 42 is exposed in the clearance opening 43 and has a first gap with the first mounting surface 34. Furthermore, the side end face of the second lens 42 protrudes from the platform surface of the receiving platform.

[0065] It should be noted that the constricted end 32 faces the observation end, and a clearance structure is designed using the mounting platform 5. The second lens 42 can be directly mounted onto the mounting platform 5 of the lens barrel 3 via the mounting groove 51. Figure 1 As can be seen, the avoidance structure design of the constriction end 32 of the lens barrel 3 is achieved by the left and right notches made by the avoidance opening 43, which can avoid structural interference with the lens barrel 3 of the adjacent lens.

[0066] As can be seen from the constricted end 32, in addition to the wedge-shaped cutting treatment, the lens barrel 3 also has a design to avoid the empty space, so that while the lens barrel 3 carries the lens, the support groove 51 can accommodate the directly mounted second lens 42.

[0067] Furthermore, more than half of the side surface of the second lens 42 is inside the lens barrel 3, while less than half is accommodated in the support groove 51. The lower edge of the contact point between the second lens 42 and the side surface of the lens barrel 3 is sealed to ensure the cleanliness of the internal optical system of the lens.

[0068] This structure allows the second lens 42 to be directly and fixedly connected to the lens barrel 3. Furthermore, the side end face of the second lens 42 is higher than the height of the support platform 5 of the lens barrel 3, and the protruding part of the side end face of the second lens 42 is used for center deviation adjustment and glue fixation.

[0069] Since the side end face of the second lens 42 is higher than the end face of the lens barrel 3 receiving platform 5, that is, the side end face of the second lens 42 is higher than the depth of the lens barrel 3 receiving platform 5, it is convenient for the lens to be centered, adjusted and glued to cure.

[0070] Further, see Figure 5 The frame 4 includes multiple sub-frames 44, which are stacked along the optical axis of the through slot 33. At least the outer side wall of the sub-frame 44 near the closing end 32 is provided with a third mounting surface 41, and a first lens 45 is installed in each sub-frame 44.

[0071] For example, the frame 4 includes three sub-frames 44, and the outer diameter of the second frame 4 from the bottom is also tapered.

[0072] In this way, the advantages of lens assembly are also reflected in: ensuring that the light transmission diameter of each first lens element is maximized, thereby ensuring the high precision of the entire optical system.

[0073] A second aspect of the present invention provides a method for assembling a lens assembly, used for assembling a lens assembly with separate lenses as described in the above embodiments. (See also...) Figure 6 The assembly method includes the following steps:

[0074] Step S1: Assemble the second lens into the lens barrel, adjust the offset and tilt between the second lens and the lens barrel, using the bottom end face and outer diameter of the lens barrel as a reference, ensure that the offset is less than 10um and the tilt is less than 30 seconds, and then apply glue to the gap between the second lens and the lens barrel.

[0075] Step S2: Apply adhesive to the gap between the side of the first lens 45 and the bearing groove 51 of the lens barrel 3 for curing and connection. After curing and stabilization, apply adhesive to the gap between all the first lenses 45 and the lens barrel 3 to seal the end and ensure the cleanliness of the internal environment of the optical system.

[0076] Step S3: After combining the first lens 45 with the corresponding sub-lens frame 44, perform centering turning to ensure that the relative tilt between the optical axis of the first lens 45 and the mechanical axis of the sub-lens frame 44 is less than 30 seconds and the offset is less than 10µm. Apply adhesive and cure until the connection between the first lens 45 and the sub-lens frame 44 is stable.

[0077] Step S4: The first lens 45 and the sub-frame 44, which have been cured and connected in step S2, are installed into the lens barrel 3 completed in step S3. The bottom end of the frame 4 is embedded and fitted with the corresponding support platform of the lens barrel 3. The relative tilt between the optical axis of the first lens 45 and the optical axis of the optical system it forms is adjusted to be less than 30 seconds and the offset is less than 10um. The three components are stably connected to the lens barrel 3 by applying adhesive and curing. The locking ring is screwed in and pressed tightly.

[0078] Furthermore, step S1 also includes: placing a shim at the bottom of the first lens 45 and the support platform of the lens barrel 3 to adjust the relative tilt, and placing a feeler gauge between the outer diameter of the first lens 45 and the inner diameter of the support groove 51 of the lens barrel 3 to control the relative offset.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lens set having a split lens, characterized by, The lens group comprises a plurality of split lenses connected in sequence, adjacent split lenses are arranged at an angle, and the split lenses comprise: A lens barrel comprises an eyepiece end and a closed end, a through slot is arranged between the eyepiece end and the closed end, a first assembly surface is arranged on the outer wall surface of the lens barrel, adjacent split lenses are connected and fixed through the first assembly surface, wherein the first assembly surface extends from the middle part of the lens barrel to the closed end, in the extension direction of the first assembly surface, the perpendicular distance between the first assembly surface and the optical axis of the lens barrel gradually decreases, and a second assembly surface is arranged in the through slot; A lens frame is installed in the through slot, a third assembly surface is arranged on the outer wall surface of the lens frame, and the third assembly surface is installed on the second assembly surface; A first lens is installed in the lens frame.

2. The lens set with a split lens barrel according to claim 1, wherein The end face of the closed end is provided with a receiving table, the receiving table is provided with a bearing groove along the circumference of the closed end, a second lens is clamped in the bearing groove, the receiving table is provided with a avoiding opening at the position of the first assembly surface, when the second lens is clamped in the bearing groove, the second lens is exposed to the avoiding opening and has a first gap with the first assembly surface, and the side end face of the second lens protrudes from the table surface of the receiving table.

3. The lens set having a split lens barrel according to claim 2, wherein The lens frame comprises a plurality of sub-lens frames, a plurality of the sub-lens frames are arranged in a stacked manner along the optical axis direction of the through slot, and the outer side wall of at least the sub-lens frame close to the closed end is provided with the third assembly surface.

4. The lens set having a split lens according to any one of claims 1 to 3, wherein The first assembly surface is an inclined plane, and a plurality of first assembly surfaces are arranged along the circumference of the split lens.

5. The lens set having a split lens barrel according to claim 4, wherein A plane perpendicular to the optical axis of the split lens is a reference surface, and the included angle between the first assembly surface and the reference surface is 150°-165°.

6. The lens set having a split lens barrel according to claim 5, wherein An adhesive layer is further arranged, and adjacent first assembly surfaces of the split lenses are adhesively fixed through the adhesive layer.

7. The lens set having a split lens barrel according to claim 6, wherein An installation gap is arranged between adjacent first assembly surfaces of the split lenses, and the installation gap is used for applying the adhesive layer.

8. The lens set having a split lens barrel according to claim 7, wherein The second assembly surface and the third assembly surface are adhesively fixed through the adhesive layer.

9. A method of assembling a mirror set, characterized by, A lens group with split lenses is assembled, and the assembly method comprises the following steps: Step S1: assembling a second lens into a lens barrel, adjusting the offset and inclination between the second lens and the lens barrel, taking the bottom end surface and the outer diameter of the lens barrel as a reference, ensuring that the offset is less than 10 um and the inclination is less than 30 seconds, and then dispensing glue in the gap between the second lens and the lens barrel; Step S2: dispensing glue in the gap between the side surface of the first lens and the bearing groove of the lens barrel, and after curing and stabilizing, dispensing glue in the gap between all the first lenses and the lens barrel to seal the end of the first lens and ensure the cleanliness of the internal environment of the optical system; Step S3: centering and turning the first lens and the corresponding sub-lens frame after combination, so that the relative inclination between the optical axis of the first lens and the mechanical axis of the sub-lens frame is less than 30 seconds, and the offset is less than 10 um, and the first lens and the sub-lens frame are adhesively fixed after curing. Step S4: the first lens and the sub-frame after the solidification connection in step S2 are put into the lens barrel completed in step S3 as a whole, the bottom end of the frame is embedded with the corresponding bearing table of the lens barrel, the relative inclination between the optical axis of the first lens and the optical axis of the optical system composed of the first lens is adjusted to be less than 30 seconds, the offset is less than 10um, the three components are connected stably with the lens barrel by the way of point gluing and solidification, and the lock ring is screwed in and pressed tightly.

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