Coating fixture for aperture lenses

Abstract

This utility model relates to the technical field of optical device coating equipment, and particularly to a coating fixture for an open-aperture lens. The open-aperture lens has a coating surface at one end along the axial direction and a positioning part at the other end. The open-aperture lens also has a through hole along the axial direction. The coating fixture includes a fixture body and a fixing member. A positioning groove is provided at the bottom of the fixture body, and a through hole communicating with the positioning groove is provided at the top of the fixture body. The positioning groove is used to position the positioning part. The fixing member passes through the through hole and the through hole in sequence. One end of the fixing member has a limiting part that can be engaged in the through hole, so that the positioning groove positions the positioning part. The coating fixture for the open-aperture lens provided by this utility model can reliably fix and accurately position the lens without obstructing the coating surface.

Description

Technical Field

[0001] This utility model relates to the technical field of optical device coating equipment, and in particular to a coating fixture for an aperture lens. Background Technology

[0002] With the rapid development of optical technology, aperture lenses, as a special optical element, have been widely used in laser systems, optical instruments, optical communication equipment, and other fields. Aperture lenses typically feature a central perforation, with one end being a curved or flat surface requiring optical coating, and the other end having a positioning part for mounting. To improve the optical performance of aperture lenses, single or multiple optical thin films are usually deposited on their surface to achieve specific optical functions such as anti-reflection, high reflectivity, and beam splitting.

[0003] In the coating process of aperture lenses, accurate positioning and reliable fixation of the lens are key factors in ensuring coating quality. The coating process is usually carried out in a vacuum environment, with the lens fixed on a planetary disk of the coating machine, rotating at high speed with the disk to ensure coating uniformity. During this process, the lens must maintain a stable position; any loosening or displacement will lead to uneven coating thickness, severely affecting the optical performance of the product.

[0004] Currently, existing lens coating fixtures primarily use clamping or pressing methods to fix lenses. Typical fixing methods include: using spring clips to hold the lens from the side or edge; using pressure plates or rings to press the lens from the top surface; and using vacuum adsorption to fix the lens. However, these traditional fixing methods all have a fundamental technical problem when applied to aperture lenses: they cannot avoid obstructing the surface to be coated.

[0005] Specifically, mechanical clamping components such as spring clips or pressure plates inevitably come into contact with the lens surface, creating obstructed areas on the coating surface. Within these obstructed areas, the coating material cannot deposit properly, resulting in incomplete coating and leaving uncoated marks or areas of uneven thickness on the lens surface. This coating defect not only affects the lens's appearance quality but, more importantly, severely impacts its optical performance, leading to decreased transmittance, uneven reflectivity, and increased scattering, rendering the lens unable to meet the performance requirements of precision optical systems.

[0006] For aperture lenses, the occlusion problem caused by traditional clamps is even more pronounced due to their unique geometry. The effective optical area of ​​an aperture lens is already reduced by the central perforation; if the effective coating area is further reduced by clamp occlusion, it will severely affect its optical performance. Especially in some high-precision optical applications, the lens coating must cover the entire effective optical surface; any occlusion is unacceptable. Utility Model Content

[0007] This invention provides a coating fixture for an open-aperture lens, which can reliably fix and accurately position the lens without obstructing the surface to be coated.

[0008] This utility model provides a coating fixture for an open-aperture lens. The open-aperture lens has a coating surface at one end along the axial direction and a positioning part at the other end. The open-aperture lens has a through hole along the axial direction. The coating fixture for the open-aperture lens includes: a fixture body, a positioning groove at the bottom of the fixture body, and a through hole communicating with the positioning groove at the top of the fixture body. The positioning groove is used to position the positioning part; a fixing member, which passes through the through hole and the through hole in sequence. One end of the fixing member has a limiting part that can be engaged in the through hole so that the positioning groove positions the positioning part.

[0009] In one possible implementation, the positioning part is an inverted platform structure, and the positioning groove is a tapered groove. The taper of the positioning groove matches the taper of the inverted platform structure, and is used to position the aperture lens along the axial and radial directions.

[0010] In one possible implementation, the through hole and the positioning groove are arranged coaxially.

[0011] In one possible implementation, a clamping mechanism is also included, which is disposed on the fixture body and is used to clamp the fixing component.

[0012] In one possible implementation, the top of the clamp body is provided with a boss, and the boss is provided with a threaded hole communicating with the through hole; the clamping mechanism includes a fastening bolt, which is screwed into the threaded hole to clamp the fixing member.

[0013] In one possible implementation, there are two threaded holes arranged radially opposite to each other along the boss, and the ends of two fastening bolts clamp the fastener so that the fastener is located on the central axis of the through hole.

[0014] In one possible implementation, a positioning block is provided inside the through hole, which is opposite to the threaded hole. The positioning block cooperates with the fastening bolt to clamp the fixing member so that the fixing member is located on the central axis of the through hole.

[0015] In one possible implementation, the fastener is a steel wire.

[0016] In one possible implementation, the inner diameter of the perforation gradually decreases from the surface to be coated to the positioning part, and the limiting part is provided at the hook-shaped structure at the end of the wire.

[0017] In one possible implementation, the limiting part is a frustum structure located at the end of the steel wire. The small end of the frustum structure is connected to the steel wire, and the large end of the frustum structure is smaller than the maximum inner diameter of the perforation and larger than the minimum inner diameter of the perforation.

[0018] This invention provides a coating fixture for an open-aperture lens. Utilizing the inherent perforation of the lens, a fixing component passes sequentially through the lens's perforation and the fixture's main body through a through-hole. A limiting part is provided at one end of the fixing component, engaging it within the perforation. Simultaneously, the positioning groove at the bottom of the fixture main body positions the lens's positioning part, forming a complete six-degree-of-freedom constraint system. The core advantage of this through-type fixing method is that the fixing component enters from the positioning part of the lens, passes through the perforation to the side of the surface to be coated, and then continues through the fixture's through-hole to the outside of the fixture. Throughout the entire fixing process, no component contacts or obstructs the surface to be coated, ensuring complete exposure of the surface. Compared to traditional clamping or pressing methods, this invention achieves true full-aperture coating, eliminating the fundamental problem of incomplete coating. The cooperation between the positioning groove and the positioning part achieves radial positioning of the lens, while the engagement of the limiting part within the perforation achieves axial positioning. Together, these two mechanisms ensure the positional stability of the lens during the coating process. This design not only solves the occlusion problem, but also provides reliable mechanical constraints that can withstand the centrifugal force and vibration generated by the high-speed rotation of the coating machine. This ensures the accuracy and stability of the lens position throughout the coating process, thereby significantly improving the uniformity and consistency of the coating quality and meeting the stringent requirements of precision optical components for coating integrity. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of a coating fixture and an open-aperture lens provided by this utility model.

[0021] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure from another angle.

[0022] Figure 3 This is a three-dimensional structural diagram of a coating fixture for an open-aperture lens provided by this utility model.

[0023] Figure 4 This is a three-dimensional structural schematic diagram of another type of coating fixture for an open-aperture lens provided by this utility model.

[0024] Figure 5 This is a schematic diagram of the planar structure of a fastener provided by this utility model.

[0025] Figure 6This is a schematic diagram of the planar structure of another fastener provided by this utility model.

[0026] Figure 7 This is a top view schematic diagram of a coating fixture for an open-aperture lens and an open-aperture lens provided by this utility model.

[0027] Figure 8 yes Figure 7 A schematic diagram of the cross-sectional structure along the AA direction.

[0028] Figure 9 This is a top view of the internal structure of a through hole provided by this utility model.

[0029] Figure 10 This is a three-dimensional structural diagram of an aperture lens provided by this utility model.

[0030] Figure label:

[0031] 1. Fixture body; 11. Positioning groove; 12. Through hole; 13. Boss; 14. Threaded hole; 15. Positioning block;

[0032] 2. Fixing component; 21. Limiting part; 211. Hook-shaped structure; 212. Frustum structure;

[0033] 3. Clamping mechanism; 31. Fastening bolts;

[0034] 4. Opening lens; 41. Surface requiring coating; 42. Positioning part; 43. Perforation. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] The following is combined Figure 1-10 This utility model provides a coating fixture for an aperture lens, such as... Figure 10 As shown, the aperture lens 4 has a coating surface 41 at one end along the axial direction and a positioning part 42 at the other end. The aperture lens 4 has a through hole 43 along the axial direction. The coating fixture for the aperture lens includes a fixture body 1 and a fixing member 2, wherein:

[0037] The bottom of the clamp body 1 is provided with a positioning groove 11, and the top of the clamp body 1 is provided with a through hole 12 communicating with the positioning groove 11. The positioning groove 11 is used to position the positioning part 42.

[0038] The fastener 2 passes through the through hole 43 and the through hole 12 in sequence. One end of the fastener 2 is provided with a limiting part 21, which can be inserted into the through hole 43 so that the positioning groove 11 positions the positioning part 42.

[0039] In this invention, the through-hole 12 and the through-hole 43 of the fixing member 2 are sequentially passed through the fixing member 2. Combined with the limiting mechanism of the limiting part 21 being able to be inserted into the through-hole 43, reliable fixing and precise positioning of the open lens 4 during the coating process are achieved, while completely avoiding obstruction or contact with the surface 41 to be coated. The fixing member 2 is inserted from the positioning part 42 side of the lens, reaches the side of the surface 41 to be coated through the through-hole 43, and then continues to pass through the through-hole 12 of the fixture body 1. Finally, the axial constraint of the lens is achieved by the locking of the limiting part 21 in the through-hole 43, while the positioning groove 11 positions the positioning part 42 to achieve radial constraint, forming a complete six-degree-of-freedom constraint system.

[0040] Specifically, the bottom of the fixture body 1 is provided with a positioning groove 11, which is specifically designed to cooperate with the positioning part 42 of the lens, achieving radial positioning of the lens through geometric matching. The top of the fixture body 1 is provided with a through hole 12 communicating with the positioning groove 11, ensuring that the fixing member 2 can be inserted from the side of the positioning groove 11 and extend to the outside of the fixture, facilitating fixing and disassembly operations by the operator. One end of the fixing member 2 is provided with a limiting part 21, the size and shape of which are designed to be able to be inserted into the through hole 43, forming a reliable mechanical limit to prevent the lens from moving in the axial direction. When the positioning groove 11 positions the positioning part 42, the surface of the lens to be coated 41 is completely exposed and will not be obstructed by any part of the fixture, ensuring the realization of full-diameter coating.

[0041] In one specific embodiment, when the aperture lens 4 needs to undergo vacuum coating, the positioning part 42 of the lens is first placed into the positioning groove 11 of the fixture body 1, with the coating surface 41 of the lens fully exposed upwards. Then, the fixing member 2 passes through the through hole 43 of the lens, passing through the through hole 43 and the through hole 12, until the limiting part 21 of the fixing member 2 is engaged within the through hole 43, thus axially fixing the lens. At this point, the lens is reliably fixed on the fixture, with no obstruction on its coating surface 41, allowing for omnidirectional vacuum coating. Throughout the coating process, even if the fixture rotates at high speed with the planetary disk of the coating machine, the lens maintains a stable position, ensuring the consistency and uniformity of the coating quality. After coating is completed, the lens can be safely removed by reversing the operation without causing any damage to the coating surface.

[0042] In related technologies, traditional lens coating fixtures typically fix lenses by clamping or pressing. These methods inevitably leave contact marks or obstructed areas on the lens surface, leading to incomplete coating. For the open-aperture lens 4, due to its special geometry, traditional fixtures are even more difficult to use effectively, often requiring complex multi-point constraint mechanisms. This not only increases the complexity of the fixture but may also create multiple obstructed areas on the lens surface. Furthermore, traditional fixtures are prone to vibration and loosening in high-speed rotating coating environments, affecting the stability of coating quality.

[0043] In this embodiment of the invention, the through-type fixing completely avoids the contact obstruction problem of traditional clamping methods. The fixing member 2 is fixed through the lens's own through hole 43, leaving no contact marks on the surface 41 to be coated. The cooperation between the positioning groove 11 and the positioning part 42, as well as the insertion of the limiting part 21 into the through hole 43, form a stable and reliable constraint mechanism, which is simpler and more effective than traditional multi-point constraints. The entire fixing process is easy to operate, and clamping and disassembly are very easy, greatly improving production efficiency. At the same time, this fixing method exhibits excellent stability in high-speed rotation environments, ensuring the consistency of coating quality.

[0044] In some embodiments, the positioning part 42 is an inverted platform structure, and the positioning groove 11 is a tapered groove. The taper of the positioning groove 11 matches the taper of the inverted platform structure, and is used to position the aperture lens 4 along the axial and radial directions.

[0045] In this invention, the automatic centering and precise positioning of the aperture lens 4 are achieved by using a truncated platform structure for the positioning part 42 and a tapered groove 11, with the tapered angle of the positioning groove 11 matching the tapered angle of the truncated platform structure. The tapered fit has a natural self-centering characteristic; when the truncated platform structure of the lens contacts the tapered groove of the fixture, even with initial radial offset, the interaction force between the tapered surfaces will automatically adjust the lens to the correct center position. This fit not only achieves radial positioning but also axial positioning through the axial constraint of the tapered surfaces, forming a dual positioning effect along both the axial and radial axes.

[0046] Specifically, the inverted platform structure is a tapered surface machined onto the cylindrical surface of the lens, with its taper determined according to the lens's specific specifications and precision requirements. The tapered groove is an inner tapered surface machined at the bottom of the fixture body 1, its taper precisely matching the taper of the inverted platform structure to ensure a good tapered fit. When the lens is placed into the fixture, the contact between the inverted platform structure and the tapered groove gradually evolves from line contact to surface contact. During this process, the lens automatically adjusts its position, ultimately achieving a completely concentric state. The self-locking characteristic of the tapered fit also prevents minute axial movement of the lens, enhancing positioning stability.

[0047] In one specific embodiment, an optical device manufacturer needs to deposit a multilayer dielectric film on a 25mm diameter aperture lens 4, requiring a coating thickness uniformity within ±2%. By adopting the conical fit positioning scheme of this invention, the lens centering accuracy reaches within 0.01mm, significantly improving the coating uniformity. In mass production, operators simply place the lens into the fixture, and the conical fit automatically completes precise positioning without manual adjustment, greatly improving production efficiency. Even during continuous production for several hours, the positioning accuracy of each lens remains highly consistent, ensuring the quality stability of the entire batch.

[0048] In this embodiment of the invention, the adaptive characteristics of the tapered fit can automatically compensate for manufacturing tolerances. Even if the lens size varies within the tolerance range, the tapered groove can still achieve good fit and positioning. The self-centering function eliminates the need for manual adjustment, reduces operational errors, and improves positioning repeatability. Compared to point or line contact, the surface contact method of the tapered fit has better load-bearing capacity and stability, making it particularly suitable for use in the high-speed rotation and vibration environment of coating machines. The dual positioning mechanism ensures precise constraint of the lens in six degrees of freedom, providing a reliable guarantee for high-quality coating.

[0049] In some embodiments, the through hole 12 and the positioning groove 11 are coaxially arranged.

[0050] In this invention, the coaxial design of the through hole 12 and the positioning groove 11 ensures a precise coaxial relationship between the fixing member 2 and the lens axis, eliminating assembly difficulties and positioning errors caused by axis misalignment. Coaxiality means that the central axis of the through hole 12 coincides with the central axis of the positioning groove 11. When the positioning part 42 of the lens is correctly positioned in the positioning groove 11, the lens axis automatically aligns with the axis of the through hole 12, allowing the fixing member 2 to smoothly pass through the lens through hole 43 and the clamp through hole 12, avoiding jamming or forced assembly due to axis misalignment.

[0051] Specifically, the coaxial setup requires that during fixture machining, the positioning groove 11 and the through hole 12 must be machined in the same clamping operation, or a precise positioning datum must be used to ensure the coincidence of their axes. The axis of the positioning groove 11 serves as the datum for lens positioning, and the axis of the through hole 12 serves as the path through which the fixing member 2 passes. Their coincidence ensures the geometric compatibility between the lens and the fixing member 2. This design eliminates the blindness in the assembly process, allowing operators to intuitively insert the fixing member 2 along a straight line without complex adjustments or searching operations.

[0052] In one specific embodiment, on a mass production line for precision optical components, the coaxial setup of this invention reduced lens clamping time from an average of 2 minutes to less than 30 seconds, increasing production efficiency by 75%. Due to the precise alignment of the axes, the penetration process of the fixing piece 2 is very smooth, avoiding potential damage to the lens perforation 43 caused by forced assembly. Quality inspection revealed that lenses fixed with coaxial clamps exhibited 15% better radial uniformity of coating thickness compared to non-coaxial designs, directly attributable to the precise alignment of the lens axis with the coating equipment axis.

[0053] In this embodiment of the invention, the coaxial arrangement fundamentally solves the problem of axis misalignment, ensuring the geometric coordination among the lens, the fixture 2, and the clamp. Precise axis alignment not only simplifies the assembly process but also improves positioning accuracy, providing a better foundation for high-quality coating. The coaxial design also facilitates the standardized production of clamps; clamps with consistent geometric precision can be mass-produced using precision machining equipment, ensuring product quality stability and interchangeability.

[0054] In some embodiments, a clamping mechanism 3 is also included, which is disposed on the clamping body 1 and is used to clamp the fixing member 2.

[0055] In this invention, a clamping mechanism 3 is added to the main body 1 of the clamp to clamp the fixing member 2, solving the problem of loosening or falling off the fixing member 2 during the coating process, and ensuring the reliability and stability of the lens fixation. The clamping mechanism 3 applies radial clamping force to the fixing member 2, causing the fixing member 2 to form a friction lock with the wall of the through hole 12, preventing the fixing member 2 from moving in the axial direction. This clamping method can not only withstand the weight of the lens, but also resist the centrifugal force and vibration force generated by the high-speed rotation of the coating machine, ensuring the stability of the lens position throughout the coating process.

[0056] Specifically, the clamping mechanism 3 is mounted on the fixture body 1 and forms an effective working relationship with the through hole 12, mechanically clamping the fixing member 2 passing through the through hole 12. The clamping force can be adjusted according to the material, diameter, and weight of the fixing member 2, ensuring sufficient clamping force to prevent slippage while avoiding over-clamping that could damage the fixing member 2. The design of the clamping mechanism 3 also considers ease of disassembly; the clamping force can be released with simple operation, facilitating the safe removal of the lens after coating.

[0057] In this embodiment of the invention, the clamping mechanism 3 provides additional safety assurance, ensuring the absolute reliability of the fixing component 2 through a dual constraint mechanism. The adjustable clamping force allows the clamp to adapt to fixing components 2 and lenses of different specifications, improving the flexibility and adaptability of the equipment. The addition of the clamping mechanism 3 also makes the entire fixing system more complete and professional, meeting the stringent reliability requirements of industrial production and providing a solid technical guarantee for mass production.

[0058] like Figure 4 As shown, in some embodiments, the top of the clamp body 1 is provided with a boss 13, and the boss 13 is provided with a threaded hole 14 communicating with the through hole 12; the clamping mechanism 3 includes a fastening bolt 31, which is screwed into the threaded hole 14 to clamp the fixing member 2.

[0059] In this invention, a boss 13 is provided on the top of the clamp body 1, and a threaded hole 14 communicating with the through hole 12 is provided on the boss 13. A fastening bolt 31 is screwed into the threaded hole 14 to clamp the fixing member 2, thus realizing the concretization and standardization of the clamping mechanism 3. The boss 13 structure provides sufficient wall thickness and strength for the threaded hole 14, ensuring the reliability and durability of the threaded connection. The communication design between the threaded hole 14 and the through hole 12 allows the fastening bolt 31 to directly act on the fixing member 2 passing through the through hole 12, achieving precise point contact clamping. The mechanical advantages of the threaded connection allow the operator to precisely control the clamping force, ensuring both the reliability of the clamping and avoiding excessive pressure on the fixing member 2.

[0060] Specifically, the boss 13 is a raised structure formed by locally thickening the top of the fixture body 1, providing the necessary space and strength support for the machining of the threaded hole 14 and the installation of the bolt. The threaded hole 14 is drilled vertically from the surface of the boss 13, intersecting with the through hole 12 at a suitable position, ensuring that the end of the fastening bolt 31 can contact the fixing member 2. The fastening bolt 31 adopts a standard thread specification, which is convenient for procurement and replacement. The selection of bolt material takes into account factors such as strength, corrosion resistance and machinability. The screw-in depth can be precisely controlled by the number of rotations of the bolt, realizing quantitative management of the clamping force.

[0061] In one specific embodiment, by adopting the threaded clamping solution of this utility model, operators can easily complete clamping and loosening operations using a standard wrench, reducing operation time by 40% compared to the previously used spring clamps or pressure plate clamping methods. The self-locking characteristic of the threaded connection ensures a very stable clamping state, preventing automatic loosening even under prolonged vibration. By establishing a standard tightening torque, consistent clamping results are ensured for different operators, improving product quality stability. The threaded hole 14 and fastening bolt 31 are standard parts, facilitating maintenance and replacement, and reducing equipment maintenance costs.

[0062] In this embodiment of the invention, the threaded clamping method has significant technical advantages, including precise control of clamping force, reliable and stable connection, simple and standardized operation, and convenient and economical maintenance. The design of the boss 13 structure fully considers strength requirements and machinability, ensuring the quality and durability of the threaded connection. The connection between the threaded hole 14 and the through hole 12 enables direct clamping of the fixing member 2, avoiding losses and deformation during force transmission, and improving the accuracy and reliability of the clamping effect.

[0063] like Figure 7 and 8 As shown, in some embodiments, there are two threaded holes 14, which are arranged opposite each other radially along the boss 13. The ends of the two fastening bolts 31 clamp the fixing member 2 so that the fixing member 2 is located on the central axis of the through hole 12.

[0064] In this invention, by providing two threaded holes 14 and arranging them radially opposite each other along the boss 13, and in conjunction with the design of clamping the ends of the two fastening bolts 31 to secure the fixing member 2, symmetrical clamping and precise center positioning of the fixing member 2 are achieved. The relative arrangement of the two threaded holes 14 ensures a uniform distribution of clamping force, eliminates eccentric loads that may occur with single-point clamping, and prevents the fixing member 2 from shifting or bending during clamping. The symmetrical clamping force allows the fixing member 2 to be precisely positioned on the central axis of the through hole 12, improving the geometric accuracy and stability of the entire fixing system.

[0065] Specifically, the two threaded holes 14 are arranged symmetrically at 180 degrees on the boss 13, ensuring the balance of the clamping force vector. When the two fastening bolts 31 are simultaneously screwed in and contact the fixing member 2, a mutually balanced clamping force system is formed, and the fixing member 2 automatically adjusts to the center position of the through hole 12 under the constraint of the two points. The machining accuracy of the threaded holes 14 is required to ensure that the axes of the two holes pass through the center of the through hole 12 and are parallel to each other, so as to ensure the symmetry of the clamping effect. The screwing depth of the two fastening bolts 31 needs to be consistent, which can be achieved through a unified operating procedure.

[0066] In this embodiment of the invention, the symmetrical clamping with two bolts completely solves the problem of single-point constraint. The symmetrical force system ensures the center positioning and stable clamping of the fixing member 2. The relative geometric relationship enables the clamping process to have a self-correcting function; even if the tightening degree of the two bolts is slightly different, the fixing member 2 can automatically adjust to the correct position under the balance of forces. This design greatly improves the reliability and repeatability of clamping, and is particularly suitable for precision coating processes with strict positioning accuracy requirements.

[0067] like Figure 9As shown, in some embodiments, a positioning block 15 is provided in the through hole 12, which is opposite to the threaded hole 14. The positioning block 15 cooperates with the fastening bolt 31 to clamp the fixing member 2 so that the fixing member 2 is located on the central axis of the through hole 12.

[0068] In this invention, by setting a positioning block 15 inside the through hole 12 opposite to the threaded hole 14, and utilizing the positioning block 15 in conjunction with the fastening bolt 31 to clamp the fixing member 2, another effective center positioning and clamping scheme is achieved. The positioning block 15 serves as a fixed support point, forming a point-to-point clamping mechanism with the fastening bolt 31, ensuring that the fixing member 2 is clamped on the central axis of the through hole 12. Compared to the double-bolt scheme, this design simplifies the structure, reduces the number of moving parts, while maintaining good clamping effect and positioning accuracy.

[0069] Specifically, the positioning block 15 is a protruding structure machined into the inner wall of the through hole 12, its position precisely corresponding to the threaded hole 14, forming a symmetrical arrangement in the diametrical direction. The shape and size of the positioning block 15 are carefully designed to provide sufficient support area while avoiding excessive local pressure on the fastener 2. When the fastening bolt 31 is screwed in, its end forms a clamping pair with the positioning block 15, and the fastener 2 is clamped between the two, achieving reliable radial constraint. The presence of the positioning block 15 makes the position of the fastener 2 more certain, eliminating positional uncertainty during the clamping process.

[0070] In this embodiment of the invention, the cooperation between the positioning block 15 and the single bolt ensures both positioning accuracy and structural simplicity, making it a cost-effective technical solution. The positioning block 15, as an integrated structure of the clamp, is relatively simple to manufacture, requiring no additional parts, thus reducing manufacturing costs and assembly complexity. The single-bolt operation simplifies the usage procedure, reduces the possibility of operational errors, and improves production efficiency. This design is particularly suitable for cost-sensitive applications that still require a certain level of precision.

[0071] In some embodiments, the fastener 2 is a steel wire.

[0072] In this invention, by defining the fixing element 2 as a steel wire, the unique performance advantages of steel wire are fully utilized, achieving an optimal balance between strength, flexibility, and ease of operation. The steel wire possesses high tensile strength, capable of withstanding the weight of the lens and various dynamic loads during the coating process. Simultaneously, its excellent flexibility makes assembly and disassembly safer, avoiding potential impact damage to the lens from rigid components. The fine diameter of the steel wire minimizes its impact on the coating area while facilitating manual operation and on-site processing adjustments.

[0073] Specifically, the steel wire as the fixing component 2 has several technical advantages. First, the circular cross-section of the steel wire forms a good geometric match with the lens perforation 43, reducing contact stress and wear. Second, the continuous length of the steel wire allows the limiting part 21 to be formed through simple bending, without the need for additional connection and assembly processes. Third, the flexibility of the steel wire allows it to adapt to a certain degree of assembly error and geometric deviation, improving the system's fault tolerance. Finally, the steel wire material is inexpensive, easy to purchase and replace, reducing operating costs.

[0074] Preferably, the fastener 2 is made of stainless steel wire with a diameter of 0.5mm-1.5mm.

[0075] In this embodiment of the invention, the selection of steel wire material is the optimal solution derived from comprehensive consideration. Its unique combination of properties makes it particularly suitable as the fixing element 2 of the lens perforation 4 coating fixture. The steel wire has a high degree of standardization, ample market supply, and facilitates bulk purchasing and inventory management. The steel wire has good surface quality and will not scratch or contaminate the lens perforation 43. The steel wire also has high recycling value, meeting the requirements of environmental protection and sustainable development.

[0076] In some embodiments, the inner diameter of the perforation 43 is gradually reduced from the surface to be coated 41 to the positioning part 42, and the limiting part 21 is provided on the hook-shaped structure 211 at the end of the wire.

[0077] In this invention, the inner diameter of the perforation 43 gradually decreases from the surface to be coated 41 towards the positioning part 42. Combined with the design of the hook-shaped structure 211 at the end of the wire, a clever fit between the tapered hole and the hook-shaped limiter is achieved, forming a reliable axial positioning mechanism. The tapered perforation 43 provides a clear locking position for the hook-shaped limiter 21, and the hook-shaped structure 211 can form an effective mechanical limit at the minimum inner diameter of the perforation 43, preventing the lens from moving in the axial direction. This design fully utilizes the lens's own geometric characteristics, achieving complex functional requirements through a simple structure.

[0078] Specifically, the tapered design of the perforation 43 causes the inner diameter of the hole to gradually transition from a larger size on the side of the surface to be coated 41 to a smaller size on the side of the positioning part 42, forming an inner conical geometry. The hook-shaped structure 211 is a limiting part 21 formed by bending the end of the steel wire into a hook shape. Its external dimensions are designed to allow the maximum inner diameter of the perforation 43 to pass through, but not the minimum inner diameter, thus forming a stop in the conical transition area. The bending angle and length of the hook-shaped structure 211 are carefully designed to ensure sufficient limiting effect while facilitating assembly and disassembly.

[0079] In this embodiment of the invention, the design of the tapered perforation 43 and the hook-shaped limiting part 21 achieves a perfect balance between structural simplicity and functional reliability. The geometric features of the tapered perforation provide a natural locking position for the hook-shaped limiting part, eliminating the need for additional complex mechanisms. The hook-shaped structure 211 is simple to manufacture, requiring only manual bending, making it easy to fabricate and adjust on-site. This fitting method has strong fault tolerance; even if the dimensions of the hook-shaped structure 211 have a certain deviation, a suitable locking position can still be found in the tapered perforation, improving the robustness of the system.

[0080] In some embodiments, the limiting part 21 is a frustum structure 212 disposed at the end of the steel wire. The small end of the frustum structure 212 is connected to the steel wire, and the large end of the frustum structure 212 is smaller than the maximum inner diameter of the through hole 43 and larger than the minimum inner diameter of the through hole 43.

[0081] In this invention, the limiting part 21 is a frustum structure 212 located at the end of the steel wire, with the smaller end of the frustum structure 212 connected to the steel wire. The larger end of the frustum structure 212 is smaller than the maximum inner diameter of the through hole 43 but larger than the minimum inner diameter of the through hole 43, achieving a more precise and standardized limiting function. Compared with the hook-shaped structure 211, the frustum structure 212 has better geometric regularity and dimensional consistency, providing a more controllable limiting effect. The conical geometry of the frustum and the tapered through hole 43 form a good fit, realizing a gradual limiting process and avoiding sudden impact.

[0082] Specifically, the frustum structure 212 is a regular geometric shape manufactured by machining or molding. Its small-end diameter matches the wire diameter, while its large-end diameter is determined based on the geometric parameters of the perforation 43. The taper of the frustum can match or slightly differ from the taper of the perforation 43 to achieve optimal limiting effect. When the frustum structure 212 enters the tapered perforation 43, the small end enters first. As the insertion depth increases, the outer diameter of the frustum gradually increases, eventually matching the inner diameter of the perforation 43 at a certain position to form a stop. The frustum structure 212 is completely located inside the perforation 43 and does not protrude onto the surface 41 to be coated, ensuring the integrity of the coating process.

[0083] In this embodiment of the invention, the regular geometry of the frustum structure 212 ensures a high degree of consistency in positioning accuracy, and the standardized manufacturing process makes mass production possible. The tapered fit between the frustum and the tapered hole provides a more stable and reliable positioning effect, avoiding stress concentration problems that may occur with point contact. The fully integrated design of the frustum structure 212 ensures complete exposure of the surface 41 to be coated, eliminating any possible shading effects, which is of great significance for applications requiring extremely high coating quality. The frustum structure 212 also has better durability and reusability, reducing long-term operating costs.

[0084] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coating fixture for an open-aperture lens, wherein the open-aperture lens (4) has a coating surface (41) at one end along the axial direction and a positioning part (42) at the other end, and the open-aperture lens (4) has a through hole (43) along the axial direction; characterized in that, The coating fixture for the aperture lens includes: The clamp body (1) has a positioning groove (11) at the bottom and a through hole (12) communicating with the positioning groove (11) at the top. The positioning groove (11) is used to position the positioning part (42). The fastener (2) passes through the through hole (43) and the through hole (12) in sequence. One end of the fastener (2) is provided with a limiting part (21). The limiting part (21) can be inserted into the through hole (43) so that the positioning groove (11) positions the positioning part (42).

2. The coating jig for a hole lens according to claim 1, wherein The positioning part (42) is an inverted platform structure, and the positioning groove (11) is a tapered groove. The taper of the positioning groove (11) matches the taper of the inverted platform structure, and is used to position the aperture lens (4) along the axial and radial directions.

3. The coating fixture for a hole lens according to claim 1, wherein The through hole (12) is coaxially arranged with the positioning groove (11).

4. The coating fixture for a hole lens according to claim 1, wherein It also includes a clamping mechanism (3), which is disposed on the clamp body (1) and is used to clamp the fixing member (2).

5. The coating fixture for a hole lens according to claim 4, wherein The top of the clamp body (1) is provided with a boss (13), and the boss (13) is provided with a threaded hole (14) communicating with the through hole (12); the clamping mechanism (3) includes a fastening bolt (31), which is screwed into the threaded hole (14) to clamp the fixing member (2).

6. The coating fixture for a hole lens according to claim 5, wherein There are two threaded holes (14), which are arranged opposite each other in the radial direction of the boss (13). The ends of the two fastening bolts (31) clamp the fixing member (2) so that the fixing member (2) is located on the central axis of the through hole (12).

7. The coating fixture for a hole lens according to claim 5, wherein A positioning block (15) is provided inside the through hole (12) opposite to the threaded hole (14). The positioning block (15) cooperates with the fastening bolt (31) to clamp the fixing member (2) so that the fixing member (2) is located on the central axis of the through hole (12).

8. The coating fixture for a hole lens according to any one of claims 1 to 7, wherein The fastener (2) is a steel wire.

9. The coating fixture for a hole lens according to claim 8, wherein The inner diameter of the perforation (43) is gradually reduced from the surface to be coated (41) to the positioning part (42), and the limiting part (21) is provided on the hook-shaped structure (211) at the end of the wire.

10. The coating fixture for a hole lens according to claim 8, wherein The limiting part (21) is a frustum structure (212) provided at the end of the steel wire. The small end of the frustum structure (212) is connected to the steel wire. The large end of the frustum structure (212) is smaller than the maximum inner diameter of the through hole (43) and larger than the minimum inner diameter of the through hole (43).

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