Lens group coaxial method and lens

Abstract

The embodiment of the invention provides a lens group coaxial method and a lens. The lens group comprises at least two lenses, and the lens group coaxial method comprises the following steps: determining the installation direction of each lens in an optical architecture model in a lens barrel according to the optical architecture model; setting the burr position of each lens according to the predetermined mounting direction of each lens; determining the parting line layout of the mold according to the set burr position; manufacturing a lens through a mold; and the manufactured lenses are installed in the lens barrel according to a predetermined installation direction, so that the at least two lenses are coaxial.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of lens installation, and more specifically, to a lens group coaxial method and a lens. Background Art

[0002] With the increasing popularity of electronic devices such as virtual reality (VR) and augmented reality (AR), the frequency of use of projection lenses is increasing significantly. In this context, it is crucial to ensure the coaxiality of the lens in the projection lens, which is directly related to the imaging quality and user experience of the device. Therefore, how to accurately control and ensure the coaxiality of the lens has become a core element that cannot be ignored in the design and manufacturing process of projection lenses.

[0003] Currently, visual guidance equipment is mainly used to ensure the coaxiality of multiple lenses. However, this method requires the introduction of a large number of auxiliary equipment, which increases production costs. The high cost leads to a decline in the market competitiveness of products and a decrease in consumers' willingness to buy.

[0004] Therefore, how to reduce production costs and improve product market competitiveness while ensuring the coaxiality of the lens has become a key issue that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present application is to provide a lens group coaxial method and a new lens technology solution.

[0006] In a first aspect, the present application provides a method for coaxial lens assembly. The lens assembly includes at least two lenses, and the method includes the following steps:

[0007] According to the optical architecture model, determining the installation direction of each lens in the optical architecture model in the lens barrel;

[0008] According to the predetermined installation direction of each lens, the burr position of each lens is set;

[0009] According to the set burr position, clarify the parting line layout of the mold;

[0010] Manufacturing a lens by using a set mold;

[0011] The manufactured lens is installed in the lens barrel according to a predetermined installation direction so that the lenses in the lens group are coaxial.

[0012] Optionally, the installation direction of each lens in the lens barrel specifically includes:

[0013] The lens is installed in the lens barrel from the first end of the lens barrel along the axis of the lens barrel; or the lens is installed in the lens barrel from the second end of the lens barrel along the axis of the lens barrel.

[0014] Optionally, according to a predetermined installation direction of each lens, setting the burr position of each lens specifically includes:

[0015] When the lens is installed in the lens barrel from the first end of the lens barrel, the burr of the lens is set on the vertical surface of the lens and close to the first surface of the lens;

[0016] When the lens is installed in the lens barrel from the second end of the lens barrel, the burr of the lens is set on the vertical surface of the lens and close to the second surface of the lens;

[0017] When the lens is installed in the lens barrel, the surface of the lens facing the first end of the lens barrel is defined as the first surface, and the surface of the lens facing the second end of the lens barrel is defined as the second surface.

[0018] Optionally, according to the set burr position, clarifying the layout of the parting line of the mold specifically includes: when the burr of the lens is set on the vertical surface of the lens and close to the second surface of the lens, the setting position of the parting line in the mold corresponds to the position of the vertical surface of the lens close to the second surface of the lens;

[0019] When the burr of the lens is set on the vertical surface of the lens and close to the first surface of the lens, the setting position of the parting line in the mold corresponds to the position of the vertical surface of the lens close to the first surface of the lens.

[0020] Optionally, before installing the manufactured lens in the lens barrel according to a predetermined installation direction, the method further includes:

[0021] Based on the optical framework model and the burr position set for each lens, a clearance portion corresponding to each burr is formed in the lens barrel.

[0022] Optionally, forming a clearance portion corresponding to each burr in the lens barrel specifically includes:

[0023] At least a portion of the inner wall of the lens barrel is inclined away from the axial direction of the lens barrel to form an inclined surface, and the area of ​​the inclined surface that is avoided relative to the vertical inner wall of the lens barrel is the avoidance portion.

[0024] Optionally, along the inner diameter direction of the lens barrel, the maximum size range of the air-avoiding portion is 0.025 mm to 0.045 mm.

[0025] Optionally, in the optical architecture model, the outer diameters of every two adjacent lenses are different, and the difference between the outer diameters of the two adjacent lenses ranges from 0.4 mm to 0.6 mm.

[0026] Optionally, based on an optical architecture model, a step surface is further formed in the lens barrel, and the step surface is used to carry a lens.

[0027] In a second aspect, the embodiment of the present application further provides a lens. The lens barrel comprises a lens barrel and a lens group, the lens group comprises at least two lenses, and the lens group is installed in the lens barrel using the lens group coaxial method as described in the first aspect.

[0028] Optionally, a plurality of space-avoiding portions are formed in the lens barrel, and the space-avoiding portions correspond one-to-one to the burrs of the lenses in the lens group.

[0029] According to the embodiment of the present application, starting from the planning of the optical architecture model, through a series of preset steps, it is ensured that the lens group can finally achieve high-precision coaxial installation. Specifically, the installation direction of each lens in the lens barrel is first clarified, and the burr position of each lens is set accordingly. Subsequently, combined with the optimized mold design, the parting line layout of these molds closely corresponds to the preset burr position. In this way, when the lens manufactured by the mold is accurately installed in the lens barrel according to the pre-planned installation direction, the entire lens group can effectively achieve coaxiality, thereby greatly ensuring the imaging quality and optical stability of the lens group. This method of achieving the coaxiality of the lens group completely through structural definition (determination of the installation direction, determination of the burr position and setting of the mold) can reduce costs and enhance product competitiveness.

[0030] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0032] Figure 1 Shown is a flow chart of a lens assembly coaxial method provided in an embodiment of the present application.

[0033] Figure 2 Shown is a structural exploded view of a lens provided in an embodiment of the present application.

[0034] Figure 3 Shown Figure 2 Schematic diagram of the structure of the lens.

[0035] Figure 4a-4c Shown Figure 3 Enlarged view of the structures at B, C and D in the middle.

[0036] Figure 5 Shown is a schematic diagram of the location of burrs in a lens.

[0037] Figure 6 Shown Figure 2 Sectional view of the lens structure Figure 1 .

[0038] Figure 7a-7c Shown Figure 6 Enlarged view of the structures at G, F and H in the middle.

[0039] Figure 8 Shown Figure 2 Cross-section of the lens mechanism Figure 2 .

[0040] Description of reference numerals:

[0041] 1. Lens tube;

[0042] 21. first lens; 22. second lens; 23. third lens; 24. spacer ring;

[0043] S1, first surface; S2, second surface; S3, facade;

[0044] 3. burr; 4. avoidance portion; 51. first inclined surface; 52. second inclined surface; 53. third inclined surface. DETAILED DESCRIPTION

[0045] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0046] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0047] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0048] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0049] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0050] In an embodiment of the present application, a lens group coaxial method is provided, the method aims to ensure that during the installation process, precise coaxiality can be maintained between at least two lenses.

[0051] Reference Figure 1 The lens group coaxial method mainly includes steps S1 to S5.

[0052] S1: According to the optical architecture model, determining the installation direction of each lens in the optical architecture model in the lens barrel 1;

[0053] S2: setting the position of the burr 3 of each lens according to the predetermined installation direction of each lens;

[0054] S3: According to the set position of burr 3, clarify the parting line layout of the mold;

[0055] S4: manufacturing a lens by using a set mold;

[0056] S5: Install the manufactured lens in the lens barrel 1 according to a predetermined installation direction, so that the lenses in the lens group are coaxial.

[0057] In step S1 , the best installation direction of each lens in the lens barrel 1 is determined according to the optical structure model.

[0058] Specifically, the optical architecture model ( Figure 2 The schematic diagram may be an optical architecture model diagram) which generally includes the geometric shape, material properties, and relative positions and arrangements of optical elements (such as lenses, reflectors, etc.). The optical architecture module facilitates users to optimize the performance of the optical system to meet specific imaging requirements.

[0059] After the optical architecture model is determined, the number of lenses in the lens barrel 1 is also determined. Based on the number of lenses to be installed and the depth of the lens barrel 1 and other specific parameters, we will plan and set the installation direction of each lens in the lens barrel 1 in advance.

[0060] When the depth of the lens barrel 1 is large, the inner diameter of the lens barrel 1 is relatively small, and the number of lenses to be installed is large, the lenses in the optical architecture model cannot be simply installed one by one in a unified installation direction inside the lens barrel 1. In this case, in order to ensure that all lenses can be installed correctly and effectively, it is usually necessary to install them from different sides of the lens barrel 1 to adapt to space limitations and ensure correct alignment and matching between lenses. Exemplarily, the lens barrel 1 is a hollow cylindrical structure with openings at both ends.

[0061] In a specific embodiment, referring to Figure 2 and Figure 6 The installation direction of each lens in the lens barrel 1 specifically includes:

[0062] The lens is installed in the lens barrel 1 from a first end of the lens barrel 1 along the axis of the lens barrel 1 ; or the lens is installed in the lens barrel 1 from a second end of the lens barrel 1 along the axis of the lens barrel 1 .

[0063] For example, refer to Figure 6 When the lens barrel 1 is placed vertically (the axis of the lens barrel 1 is set vertically), some lenses need to be installed in the lens barrel 1 from the upper end of the lens barrel 1 (that is, the lenses are installed from top to bottom), and the other lenses need to be installed in the lens barrel 1 from the lower end of the lens barrel 1 (that is, the lenses are installed from bottom to top).

[0064] Reference Figure 6 , three lenses are installed in the lens barrel 1, and the three lenses specifically include: a first lens 21, a second lens 22, and a third lens 23. The outer diameters of the first lens 21, the second lens 22, and the third lens 23 are defined in combination with the internal structure of the lens barrel 1. The first lens 21 is installed in the lens barrel 1 from the lower end. The second lens 22 is installed in the lens barrel 1 from the upper end of the lens barrel 1. After the second lens 22 is installed, the third lens 23 is installed in the lens barrel 1 from the upper end of the lens barrel 1.

[0065] Exemplarily, when the lens barrel 1 is horizontally arranged (the axis of the lens barrel 1 is horizontally arranged), some lenses need to be installed in the lens barrel 1 from the left end of the lens barrel 1 , and another part of the lenses need to be installed in the lens barrel 1 from the right end of the lens barrel 1 .

[0066] Reference Figure 2 , three lenses are installed in the lens barrel 1, and the three lenses specifically include: a first lens 21, a second lens 22, and a third lens 23. The outer diameters of the first lens 21, the second lens 22, and the third lens 23 are defined in combination with the internal structure of the lens barrel 1. The first lens 21 is installed in the lens barrel 1 from the right end. The second lens 22 is installed in the lens barrel 1 from the left end. After the second lens 22 is installed, the third lens 23 is installed in the lens barrel 1 from the left end.

[0067] In step S2, the position of the burr 3 of each lens is accurately set according to the pre-planned installation direction of each lens. The selection of the position of the burr 3 needs to ensure that the lens can maintain coaxiality during the processing and installation process.

[0068] Specifically, during the lens processing, it is difficult to completely avoid the burrs 3 on the lens edge. Therefore, in this step, the specific position of the burrs 3 on the lens is accurately planned in advance according to the predetermined installation direction of each lens. This pre-set strategy ensures that the lenses manufactured subsequently can form burrs 3 at the specified positions. When these manufactured lenses are assembled into the lens barrel 1 according to the pre-planned installation direction, the adverse effects on the coaxiality of the lens group caused by the burrs 3 problem can be effectively avoided, thereby ensuring the overall performance and accuracy of the optical system.

[0069] In a specific embodiment, referring to Figure 3 as well as Figure 4a-4cAccording to the predetermined installation direction of each lens, setting the position of the burr edge 3 of each lens specifically includes:

[0070] When the lens is installed in the lens barrel 1 from the first end of the lens barrel 1 , the burr 3 of the lens is set on the vertical surface S3 of the lens and close to the first surface S1 of the lens;

[0071] When the lens is installed in the lens barrel 1 from the second end of the lens barrel 1, the burr 3 of the lens is set on the vertical surface S3 of the lens and close to the second surface S2 of the lens;

[0072] When the lens is installed in the lens barrel 1 , the surface of the lens facing the first end of the lens barrel 1 is defined as a first surface S1 , and the surface of the lens facing the second end of the lens barrel 1 is defined as a second surface S2 .

[0073] In this embodiment, refer to Figure 3 , Figure 2 and Figure 6 If the installation direction of the lens is to enter the interior of the lens barrel 1 from the first end of the lens barrel 1 (the first end is called the "upper end" or the "left end"), then the burr 3 of the lens will be set on the vertical surface S3 of the lens (that is, the side of the lens), and this burr 3 will be close to the surface of the lens facing the first end of the lens barrel 1 (the first end is called the "upper end" or the "left end"). That is, if the installation direction of the lens is to enter the interior of the lens barrel 1 from the first end of the lens barrel 1 (the first end is called the "upper end" or the "left end"), the first surface S1 of the lens faces the first end of the lens barrel 1, and the second surface S2 faces the second end of the lens barrel 1, and the burr 3 of the lens needs to be set close to the first surface S1 of the lens.

[0074] On the contrary, if the installation direction of the lens is to enter the lens barrel 1 from the second end ("lower end" or "right end") of the lens barrel 1, the burr 3 of the lens will also be set on the vertical surface S3 of the lens, but at this time, the burr 3 will be close to the surface of the lens facing the second end ("lower end" or "right end") of the lens barrel 1. That is, the installation direction of the lens is to enter the lens barrel 1 from the second end ("lower end" or "right end") of the lens barrel 1, the first surface S1 of the lens faces the first end of the lens barrel 1, and the second surface S2 faces the second end of the lens barrel 1, and the burr 3 of the lens needs to be set close to the second surface S2 of the lens.

[0075] In short, no matter whether the lens is installed from the first end or the second end of the lens barrel 1, as long as it is installed in the pre-set direction, the side of the lens close to the burr 3 will always enter the lens barrel 1 last. Since the size of the burr 3 is usually above 0.05mm, there is almost no need to worry about the size of the burr 3 causing interference to the installation during the installation process. This design effectively avoids the adverse effects of the burr 3 problem on the coaxiality of the lens group, thereby ensuring that the overall performance and accuracy of the optical system remain at a high level.

[0076] By such a setting, when the lens is installed inside the lens barrel 1, no matter whether the lens enters from the first end or the second end, it can be ensured that the position of the burr 3 meets the installation requirements and does not adversely affect the coaxiality of the lens group. Such detail processing further improves the overall performance and stability of the optical system.

[0077] For example, refer to Figure 5 , if the predetermined installation direction of the lens is not considered, and the position of the burr 3 of the lens is not specially set, the burr 3 will randomly appear at the upper, middle or lower position of the lens elevation S3 during the manufacturing process of the lens. In this case, the position of the burr 3 will have an adverse effect on the installation of the lens and the coaxiality of the lens group, as follows:

[0078] If the burr 3 is located exactly in the middle of the lens facade S3, then no matter whether the lens is installed from the first end or the second end of the lens barrel 1, the burr 3 at this position will cause an obstacle in the installation process, thereby affecting the coaxiality of the lens group and causing the performance of the optical system to deteriorate.

[0079] If the burr 3 is located at the lower part of the lens facade S3 and the lens is installed from the first end of the lens barrel 1, the burr 3 at this position will rub against the inner wall of the lens barrel 1 or other components during installation, affecting the smooth installation of the lens, while also destroying the coaxiality of the lens group and reducing the accuracy of the optical system.

[0080] If the burr 3 is located on the upper part of the lens facade S3 and the lens is installed from the second end of the lens barrel 1, similarly, the burr 3 at this position will cause interference during the installation process, affecting the precise positioning of the lens, and further affecting the coaxiality of the lens group and the overall performance of the optical system.

[0081] Therefore, in order to ensure the performance and accuracy of the optical system, the embodiment of the present application takes the installation direction of the lens into consideration when manufacturing the lens, and reasonably sets the position of the burr 3 to avoid the occurrence of the above-mentioned adverse situation.

[0082] For example, refer to Figure 3 and Figure 4a-4c, three lenses are installed in the lens barrel 1, and the three lenses specifically include: a first lens 21, a second lens 22, and a third lens 23. The outer diameters of the first lens 21, the second lens 22, and the third lens 23 are defined in combination with the internal structure of the lens barrel 1. The first lens 21 is installed in the lens barrel 1 from the right end. The second lens 22 is installed in the lens barrel 1 from the left end. After the second lens 22 is installed, the third lens 23 is installed in the lens barrel 1 from the left end.

[0083] Reference Figure 4c For the first lens 21, it is assumed that the burr 3 of the lens is located at the lower position of the lens vertical surface S3.

[0084] Reference Figure 4b For the second lens 22, it is assumed that the burr 3 of the lens is located at the upper position of the lens vertical surface S3.

[0085] Reference Figure 4a For the third lens 23, it is assumed that the burr 3 of the lens is located at the upper position of the lens vertical surface S3.

[0086] In step S3, the parting line layout of the mold is determined according to the set position of the lens burr 3. The parting line design of the mold needs to ensure that the lens can be molded according to the predetermined shape and size during the manufacturing process, and by clarifying the parting line layout of the mold, it is ensured that the burr 3 of each lens is located at the pre-set position of the lens.

[0087] Specifically, in the process of manufacturing lens molds, the position of the parting line plays a decisive role, and the parting line directly indicates the specific area where the burrs 3 on the lens may appear. Generally speaking, the design position of the mold parting line is highly consistent with the position where the burrs 3 on the lens are formed. In short, if the parting line is located at a certain position of the mold, then the lens is very likely to form burrs 3 at the corresponding position.

[0088] In a specific embodiment, according to the set position of the burr 3, clarifying the parting line layout of the mold specifically includes:

[0089] When the burr 3 of the lens is set on the vertical surface S3 of the lens and close to the second surface S2 of the lens, the setting position of the parting line in the mold corresponds to the position of the vertical surface S3 of the lens close to the second surface S2 of the lens;

[0090] When the burr 3 of the lens is set on the vertical surface S3 of the lens and close to the first surface S1 of the lens, the setting position of the parting line in the mold corresponds to the position of the vertical surface S3 of the lens close to the first surface S1 of the lens.

[0091] Specifically, if the design requirement is to control the burrs 3 of the lens to the facade S3, and these burrs 3 need to be close to the second surface S2 of the lens, the parting line of the mold should be precisely set at a position corresponding to the facade S3 of the lens and close to the second surface S2. This means that when the mold is closed for injection molding, the position of the parting line will directly correspond to the desired position of the burrs 3 on the lens, ensuring that the burrs 3 formed by the overflow of material during the injection molding process meet the design requirements.

[0092] On the contrary, if the design requirement is to control the burrs 3 of the lens to the facade S3, but require these burrs 3 to be close to the first surface S1 of the lens, then the parting line of the mold should be precisely set at a position corresponding to the facade S3 of the lens and close to the first surface S1. In this way, the position of the parting line is consistent with the desired position of the burrs 3 on the lens, and the burrs 3 formed by the overflow of the material during injection molding will be strictly controlled within the design range.

[0093] In step S4, the lens is manufactured using the designed mold. In this step, various parameters in the manufacturing process need to be strictly controlled to ensure the quality and accuracy of the lens.

[0094] In step S5, the manufactured lens is installed in the lens barrel 1 according to a predetermined installation direction. During the installation process, it is necessary to ensure that each lens can be accurately aligned to its predetermined position, so as to achieve the coaxiality of all lenses in the lens group.

[0095] Therefore, in this embodiment, starting from the planning of the optical architecture model, a series of preset steps are used to ensure that the lens group can finally achieve high-precision coaxial installation. Specifically, the installation direction of each lens in the lens barrel 1 is first clarified, and the position of the burr 3 of each lens is set accordingly. Subsequently, combined with the optimized mold design, the parting line layout of these molds closely corresponds to the preset position of the burr 3. In this way, when the lens manufactured by the mold is accurately installed in the lens barrel 1 according to the pre-planned installation direction, the entire lens group can effectively achieve coaxiality, thereby greatly ensuring the imaging quality and optical stability of the lens group. In addition, this method of achieving the coaxiality of the lens group by means of structural definition (determination of the installation direction, determination of the burr position and setting of the mold) can reduce costs and enhance product competitiveness.

[0096] Optionally, when the lens is installed in the lens barrel 1, the flatness requirements of the lens and the spacer ring 24 that separates adjacent lenses need to be met. Specifically, the overall flatness of the lens and the spacer ring 24 is ensured, the directional consistency of the lens module is ensured, and the flatness is set to the corresponding flatness control value according to the requirements. Exemplarily, the flatness of the lens and the spacer ring 24 is 0.05 mm.

[0097] In a specific embodiment, referring to Figure 6 and Figure 7a to Figure 7c Before installing the manufactured lens in the lens barrel 1 according to a predetermined installation direction, the method further includes:

[0098] Based on the optical structure model and the position of the burr 3 set for each lens, a clearance portion 4 corresponding to each burr 3 is formed in the lens barrel 1 .

[0099] In this embodiment, in order to ensure that the manufactured lens can be installed in the lens barrel 1 according to a predetermined installation direction, a step is added before installation: based on the optical architecture model and the position of the burr 3 set for each lens, a gap 4 corresponding to each burr 3 is formed in the lens barrel 1.

[0100] Specifically, the presence of the clearance portion 4 provides additional space for the burr 3 of the lens, thereby preventing the lens from being damaged or the installation position shifted during the installation process due to friction or collision between the burr 3 and the inner wall of the lens barrel 1, which affects the coaxiality of the lens group. During the installation process, even if there is a certain tolerance range in the size of the burr 3 of the lens, the clearance portion 4 can provide enough space to accommodate these differences, thereby ensuring that the lens can be installed in place.

[0101] For example, the optical architecture model can be used to calculate the size and position of the airtight portion 4 required for each lens during installation, ensuring that the airtight portion 4 can meet the requirements of lens installation without negatively affecting the overall optical performance of the lens.

[0102] Furthermore, forming a clearance portion 4 corresponding to each burr 3 in the lens barrel 1 specifically includes: at least a portion of the inner wall of the lens barrel 1 is inclined away from the axial direction of the lens barrel 1 to form an inclined surface, and the area of ​​the inclined surface that is avoided relative to the vertically arranged inner wall of the lens barrel 1 is the clearance portion 4.

[0103] Specifically, at least a portion of the inner wall of the lens barrel 1 is designed to be an inclined surface inclined away from the axis direction of the lens barrel 1. The size and position of the clearance portion 4 can be calculated by the inclination angle and length of the inclined surface to meet the requirements of different lens burrs 3.

[0104] Specifically, the inclined surface will leave a specific area relative to the vertical inner wall of the lens barrel 1, and this area is the avoidance portion 4. The shape and size of the avoidance portion 4 are closely related to the shape and size of the burr 3 of the lens, ensuring that the burr 3 can smoothly enter the avoidance portion 4 without being blocked when the lens is installed.

[0105] In addition, the design of the inclined surface also plays a guiding role, which facilitates the installation of the lens. During the installation process, the lens can slide smoothly into the predetermined position along the inclined surface, reducing the difficulty and time of installation.

[0106] For example, refer to Figure 7c, corresponding to the position of the burr 3 of the first lens 21 , a first inclined surface 51 is formed on the inner wall of the lens barrel 1 , and the area avoided by the first inclined surface 51 is the avoidance portion 4 , and the burr 3 is located in the avoidance portion 4 .

[0107] Reference Figure 7b Corresponding to the position of the burr 3 of the second lens 22 , a second inclined surface 52 is formed on the inner wall of the lens barrel 1 . The area avoided by the second inclined surface 52 is the avoiding portion 4 , and the burr 3 is located in the avoiding portion 4 .

[0108] Reference Figure 7a Corresponding to the position of the burr 3 of the third lens 23 , a third inclined surface 53 is formed on the inner wall of the lens barrel 1 . The area evacuated by the third inclined surface 53 is the avoidance portion 4 , and the burr surface is located in the avoidance portion 4 .

[0109] In one embodiment, along the inner diameter direction of the lens barrel 1 , the maximum size range of the air-avoiding portion 4 is 0.025 mm to 0.045 mm.

[0110] In this embodiment, in order to ensure the convenience of lens assembly and the feasibility of placement, the maximum size range of the clearance portion 4 is 0.025 mm to 0.045 mm.

[0111] Specifically, the size range of 0.025mm to 0.045mm can minimize the impact on the optical performance of the lens while ensuring the convenience of assembly. This size range is not only suitable for different types of lenses and lens barrels 1, but also can adapt to different assembly processes and tolerance requirements. Preferably, the maximum size range of the air-avoiding portion 4 is 0.03mm.

[0112] In one embodiment, referring to Figure 8 In the optical architecture model, the outer diameters of every two adjacent lenses are different, and the difference between the outer diameters of the two adjacent lenses ranges from 0.4 mm to 0.6 mm.

[0113] Specifically, to ensure the coaxiality of two adjacent lenses, the outer diameters of the two adjacent lenses are designed to be different values ​​according to the assembly direction, sequence and position of the burr 3. In particular, when the outer diameters of the two lenses can be equal, the outer diameters of the two lenses are deliberately set to differ by 0.4 mm to 0.6 mm.

[0114] The outer diameter of the third lens 23 is 0.2mm to 0.3mm larger than the outer diameter of the second lens 22. This design is mainly based on the actual needs of the assembly process. In actual installation, the lens will inevitably form burrs 3 during the manufacturing process. By making the outer diameter of the third lens 23 larger than the second lens 22 by 0.2mm to 0.3mm, an additional gap is provided for the third lens 23 during assembly to avoid the gap reserved for the burrs 3 of the second lens 22. This can prevent problems caused by the inability to accurately control the coaxiality of the third lens 23 during assembly to a certain extent.

[0115] For example, refer to Figure 8 The diameter of the second lens 22 is φ2=50 mm, and the diameter of the third lens 23 is φ3=50.4 mm.

[0116] For example, refer to Figure 8 The diameter dimension of the first lens 21 is φ1=40 mm, and the inner diameter dimension of the position corresponding to the burr 3 of the first lens 21 in the lens barrel 1 is φ11=40.06 mm (including the dimension of the avoidance portion 4 corresponding to the burr 3 of the first lens 21).

[0117] The diameter dimension of the second lens 22 is φ2=50 mm, and the inner diameter dimension of the position corresponding to the burr 3 of the second lens 22 in the lens barrel 1 is φ21=50.06 mm (including the dimension of the clearance portion 4 corresponding to the burr 3 of the second lens 22).

[0118] The diameter dimension of the third lens 23 is φ3=50.4 mm, and the inner diameter dimension of the position corresponding to the burr 3 of the third lens 23 in the lens barrel 1 is φ31=50.46 mm (including the dimension of the clearance portion 4 corresponding to the burr 3 of the third lens 23).

[0119] In one embodiment, based on the optical architecture model, a step surface is further formed in the lens barrel 1 , and the step surface is used to carry a lens.

[0120] In this embodiment, the main function of the step surface is to support the lens, ensure the correct position and stability of the lens in the lens barrel 1, and further ensure the coaxiality of the lens group.

[0121] The embodiment of the present application further provides a lens, which includes a lens barrel 1 and a lens group, wherein the lens group includes at least two lenses, and the lens group is installed in the lens barrel 1 using the lens group coaxial method as described above.

[0122] The lens provided in the embodiment of the present application achieves high-precision installation and stable fixation of the lens group through the above-mentioned coaxial installation method of the lens group, thereby improving the overall optical performance and stability of the lens.

[0123] In one embodiment, a plurality of space-avoiding portions 4 are formed in the lens barrel 1 , and the space-avoiding portions 4 correspond one-to-one to the burrs 3 of the lenses in the lens group.

[0124] In this embodiment, the presence of the clearance portion 4 provides additional space for the burr 3 of the lens, thereby preventing the lens from being damaged or the installation position shifted during the installation process due to friction or collision between the burr 3 and the inner wall of the lens barrel 1, which affects the coaxiality of the lens group. During the installation process, even if there is a certain tolerance range in the size of the burr 3 of the lens, the clearance portion 4 can provide enough space to accommodate these differences, thereby ensuring that the lens can be installed in place.

[0125] Exemplarily, a slope is formed on the inner wall of the lens barrel 1 to avoid the clearance portion 4 . In this way, on the basis of avoiding the lens burr 3 , the slope can also play a guiding role to guide the lens to be installed in the lens barrel 1 .

[0126] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0127] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A lens assembly coaxial method, characterized in that: The lens set includes at least two lenses, and the method includes the following steps: According to the optical architecture model, determining the installation direction of each lens in the optical architecture model in the lens barrel (1); According to the predetermined installation direction of each lens, the position of the burr edge (3) of each lens is set; According to the set burr (3) position, the parting line layout of the mold is clarified; Manufacturing a lens by using a set mold; The manufactured lens is installed in the lens barrel (1) according to a predetermined installation direction, so that the lenses in the lens group are coaxial.

2. The lens assembly coaxial method according to claim 1, characterized in that: The installation direction of each lens in the lens barrel (1) specifically includes: The lens is installed in the lens barrel (1) from a first end of the lens barrel (1) along the axis of the lens barrel (1); or the lens is installed in the lens barrel (1) from a second end of the lens barrel (1) along the axis of the lens barrel (1).

3. The lens assembly coaxial method according to claim 2, characterized in that: According to the predetermined installation direction of each lens, setting the position of the burr edge (3) of each lens specifically includes: When the lens is installed in the lens barrel (1) from the first end of the lens barrel (1), the burr (3) of the lens is set on the vertical surface (S3) of the lens and close to the first surface (S1) of the lens; When the lens is installed in the lens barrel (1) from the second end of the lens barrel (1), the burr edge (3) of the lens is set on the vertical surface (S3) of the lens and close to the second surface (S2) of the lens; When the lens is installed in the lens barrel (1), the surface of the lens facing the first end of the lens barrel (1) is defined as a first surface (S1), and the surface of the lens facing the second end of the lens barrel (1) is defined as a second surface (S2).

4. The lens assembly coaxial method according to claim 3, characterized in that: According to the set position of the burr (3), the mold parting line layout is clarified, including: When the burr edge (3) of the lens is set on the vertical surface (S3) of the lens and close to the second surface (S2) of the lens, the setting position of the parting line in the mold corresponds to the position of the vertical surface (S3) of the lens close to the second surface (S2) of the lens; When the burr edge (3) of the lens is set on the vertical surface (S3) of the lens and close to the first surface (S1) of the lens, the setting position of the parting line in the mold corresponds to the position of the vertical surface (S3) of the lens close to the first surface (S1) of the lens.

5. The lens assembly coaxial method according to claim 1, characterized in that: Before installing the manufactured lens in the lens barrel (1) according to a predetermined installation direction, the method further includes: Based on the optical framework model and the position of the burr (3) set for each lens, a clearance portion (4) corresponding to each burr (3) is formed in the lens barrel (1).

6. The lens assembly coaxial method according to claim 5, characterized in that: The avoidance portion (4) corresponding to each burr edge (3) is formed in the lens barrel (1) and specifically comprises: At least a portion of the inner wall of the lens barrel (1) is inclined away from the axial direction of the lens barrel (1) to form an inclined surface, and the area left by the inclined surface relative to the vertically arranged inner wall of the lens barrel (1) is the avoidance portion (4).

7. The lens assembly coaxial method according to claim 6, characterized in that: Along the inner diameter direction of the lens barrel (1), the maximum size range of the air avoidance portion (4) is 0.025 mm to 0.045 mm.

8. The lens assembly coaxial method according to claim 1, characterized in that: In the optical architecture model, the outer diameters of every two adjacent lenses are different, and the difference between the outer diameters of the two adjacent lenses ranges from 0.4 mm to 0.6 mm.

9. The lens assembly coaxial method according to claim 8, characterized in that: Based on the optical architecture model, a step surface is also formed inside the lens barrel (1), and the step surface is used to carry a lens.

10. A lens, characterized in that: It comprises a lens barrel (1) and a lens group, wherein the lens group comprises at least two lenses, and the lens group is installed in the lens barrel (1) by using the lens group coaxial method described in any one of claims 1 to 9.

11. The lens according to claim 10, characterized in that: A plurality of space-avoiding portions (4) are formed in the lens barrel (1), and the space-avoiding portions (4) correspond one-to-one to the burrs (3) of the lenses in the lens group.

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