Low-distortion high-precision adjustable protective type precision machine vision ultraviolet lens

Abstract

This application discloses a low-distortion, high-precision, adjustable protective ultraviolet lens for machine vision, relating to the field of optical instrument technology. It includes a connecting plate, a housing, a lens assembly, an adjustment mechanism, a disassembly / removal mechanism, and a protective component. The housing is located on one side of the connecting plate and has an internal groove to accommodate the lens assembly, which includes negative and positive diopter lenses arranged along the optical axis. The adjustment mechanism includes a guide rail, a moving block, and a locking element. The moving block connects to a portion of the lens and slides along the guide rail, while the locking element fixes its position to adjust the optical path. The disassembly / removal mechanism is located at the end of the housing and uses elastic elements and snap-fit ​​mechanisms to detach and secure the cover. The protective component covers the outer surface of the housing and consists of a buffer layer and an outer anti-slip layer. This application achieves precise micro-adjustment of the lens position to reduce distortion, while integrating quick disassembly / removal and efficient protection functions, improving imaging accuracy and environmental adaptability.

Description

Technical Field

[0001] This application relates to a low-distortion, high-precision, adjustable protective ultraviolet lens for machine vision, belonging to the field of optical instrument technology. Background Technology

[0002] In the field of precision machine vision inspection, ultraviolet (UV) lenses, as core imaging components, are widely used in semiconductor wafer inspection, micro / nano structure analysis, and high-precision surface defect identification. Existing UV lens technologies typically employ fixed-focal-length optical structures, using a specific arrangement of lens groups to achieve UV imaging, and relying on a metal casing for basic structural support and internal optical path light protection. To meet different detection depth-of-field or magnification requirements, some existing technologies adapt by replacing the entire lens with a different specification or adjusting the object distance using an external mechanical gimbal. Furthermore, to address potential vibration or impact risks in industrial environments, independent protective covers are usually added to the lens, or the entire equipment's protective frame is used to ensure the safety of the optical components.

[0003] However, current limitations include the lack of a flexible optical axis fine-tuning mechanism in traditional fixed ultraviolet lenses. When rapid focusing or correction of minute distortions is required for objects of varying thicknesses, the entire lens assembly often needs to be disassembled or a high-precision external displacement platform must be used. This results in a cumbersome and inefficient adjustment process, making it difficult to achieve precise compensation within the lens. Furthermore, the external protection of existing lenses largely relies on additional components. This split structure not only increases the overall size and assembly complexity but also makes the optical axis stability susceptible to loose connections. Additionally, conventional housing surfaces lack targeted cushioning and anti-slip designs, making them prone to slippage under complex operating conditions or damage to internal precision lenses due to accidental impacts. This makes it difficult to balance the stability required for high-precision imaging with the durability and protection needed in industrial environments. Summary of the Invention

[0004] The present invention aims to solve the technical problems of existing ultraviolet lenses in precision machine vision applications, such as insufficient adjustment flexibility, difficulty in fine-tuning the position of internal lenses leading to distortion correction difficulties, and the susceptibility to damage from industrial environments due to the lack of a single external protective structure and integrated buffer and anti-slip design.

[0005] To achieve the above objectives, this application provides the following technical solution: A low-distortion, high-precision, adjustable protective ultraviolet lens for precision machine vision, comprising: Connecting plate; The outer shell is fixedly connected to the connecting plate on one side, and the interior of the outer shell is provided with a groove extending along the optical axis. A lens assembly disposed within the groove includes at least one negative diopter lens and at least one positive diopter lens arranged sequentially along the optical axis. An adjustment mechanism is provided on the housing. The adjustment mechanism includes a guide rail, a moving block, and a locking member. The guide rail is located on the outer or inner side of the housing and defines a movement trajectory. The moving block is connected to at least a portion of the lenses in the lens assembly and is slidably engaged with the guide rail. The locking member is used to fix the moving block at any position on the guide rail. A disassembly and assembly mechanism, disposed at the end of the outer casing, includes an elastic element and a latch. The latch, under the action of the elastic element, has an engaged state and an unlocked state, for detachably securing a cover. A protective component, which covers the outer surface of the housing, the protective component including a buffer layer and an anti-slip layer disposed outside the buffer layer.

[0006] Optionally, the lens assembly includes five spherical lenses, arranged sequentially from the object side to the image side along the optical axis as follows: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; Among them, the first lens, the third lens and the fifth lens are negative diopter lenses, and the second lens and the fourth lens are positive diopter lenses; The negative diopter lens is made of fused silica, and the positive diopter lens is made of calcium fluoride.

[0007] Optionally, the adjustment mechanism further includes a movable groove formed in the guide rail, and the movable block is embedded in the movable groove and can slide along the optical axis. The locking component includes a fixing screw that passes through the movable block and a nut that is threadedly engaged with the fixing screw. By tightening the nut, the movable block is pressed against the guide rail to achieve positioning.

[0008] Optionally, the disassembly and assembly mechanism further includes mounting grooves and baffles symmetrically arranged at the ends of the housing; The elastic element is a spring, one end of which abuts against the bottom of the mounting groove, and the other end abuts against the baffle. The buckle is connected to the side of the baffle away from the spring. The end of the buckle is provided with a bevel. The inner circumference of the cover is provided with a groove that matches the buckle. When the cover is pressed to the end of the outer shell, the buckle retracts along the bevel and springs into the groove to lock.

[0009] Optionally, the buffer layer in the protective assembly is a rubber pad, and the anti-slip layer is a protective plate fixed to the outside of the rubber pad; The outer surface of the protective plate is provided with several anti-slip patterns arranged at equal intervals, and the anti-slip patterns extend along the axial or circumferential direction of the outer shell.

[0010] Optionally, the refractive index of the fused silica material is 1.46±0.02, and the Abbe number is 67.5±1.5; The refractive index of the calcium fluoride material is 1.43±0.02, and the Abbe number is 95±2.

[0011] Optionally, the housing may further include an aperture stop located between the lens assembly and the end of the housing. A glass lens is also installed at the end of the housing, and the cover for fixing the disassembly mechanism covers the outside of the glass lens.

[0012] Optionally, the length of the guide rail is 60% to 80% of the length of the housing; The moving block travels along the guide rail within a range of 0 mm to 20 mm; The fixing screws are of specifications from M3 to M5, and the nuts are equipped with anti-loosening washers.

[0013] Optionally, the spring has a wire diameter of 0.5 mm to 1.0 mm and an elastic modulus of 5 N / mm to 10 N / mm; The bevel angle at the end of the buckle is 30° to 45°; The depth of the slot on the cover is 2mm to 5mm.

[0014] Optionally, the thickness of the rubber pad is 3 mm to 8 mm, and the Shore hardness is 40 HA to 60 HA; The protective plate is made of aluminum alloy and has a thickness of 1mm to 3mm; The anti-slip texture has a depth of 0.5mm to 1.0mm, and the spacing between adjacent anti-slip textures is 3mm to 5mm.

[0015] Compared with the prior art, the beneficial effects of this application include: This application achieves precise fine-tuning of some lenses along the optical axis in the lens assembly by incorporating an adjustment mechanism with guide rails and moving blocks inside the housing. This design allows users to change the lens spacing directly by sliding the moving blocks on the guide rails without disassembling the lens or relying on expensive external displacement platforms. This enables flexible correction of aberrations, reduction of distortion, and adaptation to imaging requirements at different working distances, significantly improving the adjustment accuracy and ease of use of the lens. Combined with the positioning function of the locking mechanism, it ensures extremely high stability of the adjusted optical system, effectively guaranteeing the repeatability and positioning accuracy of machine vision inspection.

[0016] Furthermore, this application integrates an innovative disassembly and assembly mechanism and protective components, solving the problem of insufficient protective performance of traditional lenses. Through the cooperation of elastic elements and clips, the cover can be quickly disassembled and assembled with a single click, facilitating cleaning and maintenance of the internal glass lens while providing reliable dust protection when not in use. The external protective components adopt a double-layer structure of "buffer layer + anti-slip layer." The rubber pad effectively absorbs external impact energy, preventing damage to internal precision optical components due to vibration or bumps, while the aluminum alloy protective plate with anti-slip texture not only enhances grip friction to prevent the lens from slipping during operation or installation but also improves the overall mechanical strength and durability of the structure, making it more adaptable to complex and changing industrial environments. The specific combination of fused silica and calcium fluoride materials further ensures high transmittance, low dispersion, and excellent thermal stability in the ultraviolet band, achieving a perfect balance of low distortion, high precision, and high protection. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall assembly structure of a low-distortion, high-precision, adjustable protective ultraviolet lens for precision machine vision provided in one embodiment of this application. Figure 2 A frontal cross-sectional schematic diagram of a low-distortion, high-precision, adjustable protective precision machine vision ultraviolet lens provided in one embodiment of this application. Figure 3 This is an enlarged schematic diagram of the disassembly and assembly mechanism of a low-distortion, high-precision, adjustable protective ultraviolet lens for precision machine vision provided in one embodiment of this application. Figure 4 This is a schematic diagram of the adjustment mechanism of a low-distortion, high-precision, adjustable protective ultraviolet lens for precision machine vision provided in one embodiment of this application. Figure 5 This is a schematic diagram of the protective assembly of a low-distortion, high-precision, adjustable protective precision machine vision ultraviolet lens provided in one embodiment of this application. Figure label: 1-Connecting plate; 2-Outer shell; 21-Groove; 22-Aperture; 3-Lens assembly; 31-First lens; 32-Second lens; 33-Third lens; 34-Fourth lens; 35-Fifth lens; 4-Adjustment mechanism; 41-Guide rail; 42-Moving block; 43-Moving groove; 44-Fixing screw; 45-Nut; 5-Disassembly and assembly mechanism; 51-Snap fastener; 52-Mounting slot; 53-Baffle; 54-Spring; 6-Lid; 7-Protective components; 71-Rubber pad; 72-Protective plate; 73-Anti-slip texture; 8-Glass lens. Detailed Implementation

[0018] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] To address the problems of existing ultraviolet lenses lacking internal fine-tuning mechanisms, which leads to difficulties in distortion correction, and having low integration of external protection, this application provides a basic technical solution.

[0020] Please refer to Figure 1-5 This invention provides a low-distortion, high-precision, adjustable protective ultraviolet lens for machine vision, comprising a connecting plate 1; a housing 2, one side of which is fixedly connected to the connecting plate 1, and the housing 2 having a groove 21 extending along the optical axis inside; a lens assembly 3 disposed within the groove 21, comprising at least one negative diopter lens and at least one positive diopter lens arranged sequentially along the optical axis; and an adjustment mechanism 4 disposed on the housing 1, the adjustment mechanism 4 comprising a guide rail 41, a moving block 42, and a locking element, the guide rail 41 being disposed on the outer or inner side of the housing 2 and defining the... The moving block 42 is connected to at least a portion of the lenses in the lens assembly 3 and slidably fitted to the guide rail 41. The locking member is used to fix the moving block 42 at any position on the guide rail 41. The disassembly and assembly mechanism 5 is located at the end of the housing 2. The disassembly and assembly mechanism 5 includes an elastic member and a buckle 51. The buckle 51 has an engaged state and an unlocked state under the action of the elastic member, and is used to detachably fix a cover 6. The protective component 7 covers the outer surface of the housing 2. The protective component 7 includes a buffer layer and an anti-slip layer located on the outside of the buffer layer.

[0021] It should be noted that the connecting plate 1 is made of high-strength aluminum alloy by CNC machining and the surface is anodized. It is used to securely install the entire lens module onto the mounting flange of the machine vision equipment. In practical applications, this component can also be made of stainless steel or titanium alloy, which is not limited in this embodiment. The outer shell 2 is a cylindrical or square-column metal shell. The internal groove 21 is formed by precision boring and is used to accommodate the lens assembly 3 and provide optical path shielding. The negative diopter lens and positive diopter lens in the lens assembly 3 are fixed to the moving block 42 or the inner wall base of the outer shell 2 by optical bonding or mechanical clamping. The guide rail 41 of the adjustment mechanism 4 is a linear guide rail or dovetail groove structure, which is formed on the surface or inner cavity of the outer shell 2 by wire cutting or grinding. The moving block 42 is a slider that matches the shape of the guide rail 41 and is connected to the lens mount by interference fit or pin. The locking part is a hand screw or hex screw, which passes through the threaded hole on the moving block 42 and abuts against the side of the guide rail 41. The elastic element of the disassembly mechanism 5 is a spring 54, and the buckle 51 is a metal or hard plastic part with a barb structure, which is connected to the end of the outer shell 2 by riveting or integral molding. The buffer layer of the protective component 7 is attached to the outer wall of the outer shell 2, and the anti-slip layer is wrapped around the outside of the buffer layer.

[0022] The working principle of this application is as follows: the moving block 42 is driven to slide along the guide rail 41 by operating the adjustment mechanism 4 to change the lens spacing to optimize the imaging quality; the cover 6 is opened and closed quickly by the disassembly and assembly mechanism 5 to protect the lens; and the protective component 7 is used to resist external impact and prevent slippage.

[0023] The advantages of this application are: it enables flexible adjustment of the internal optical parameters of the lens, significantly reduces system distortion, and integrates efficient protection and maintenance functions, thereby improving the reliability and service life of the equipment in industrial environments.

[0024] To further optimize imaging quality in the ultraviolet band and correct chromatic aberration, this application details the specific configuration of the lens assembly. Please refer to... Figure 1-5 As shown, the lens assembly 3 includes five spherical lenses, arranged sequentially from the object side to the image side along the optical axis: first lens 31, second lens 32, third lens 33, fourth lens 34, and fifth lens 35; wherein, first lens 31, third lens 33, and fifth lens 35 are negative diopter lenses, and second lens 32 and fourth lens 34 are positive diopter lenses; the material of the negative diopter lens is fused silica, and the material of the positive diopter lens is calcium fluoride.

[0025] It should be noted that the first lens 31 to the fifth lens 35 are all precision-ground and polished spherical lenses, and their radii of curvature are determined by optimization using optical design software. Fused silica is selected from high-purity synthetic quartz materials, such as Heraeus's Suprasil series or Corning's 7980 series, which have extremely high transmittance and extremely low coefficient of thermal expansion in the ultraviolet band. In practical applications, other grades of synthetic quartz can also be selected for this component; this application embodiment does not limit this choice. Calcium fluoride (CaF2) is selected from optical-grade single-crystal calcium fluoride materials, such as products manufactured by ISP Optics or Crystall, which have excellent dispersion characteristics. In practical applications, optical-grade calcium fluoride from other suppliers can also be selected for this component; this application embodiment does not limit this choice. The alternating arrangement of negative and positive diopter lenses constitutes an apochromatic structure, compensating for each other through the dispersion differences of the different materials. The working principle of this structure is based on the refractive index variation of fused silica and calcium fluoride at different wavelengths. By rationally allocating positive and negative optical power, axial chromatic aberration and magnification chromatic aberration are eliminated. The effect of this technology is that it significantly improves the resolution and contrast of the lens in the ultraviolet band, achieving low-distortion and high-precision imaging performance, making it particularly suitable for the precision detection of micro- and nano-structures.

[0026] To achieve precise locking of the lens position and ensure stability after adjustment, this application provides a detailed design of the adjustment mechanism's structure. Please refer to... Figure 1-5 As shown, the adjustment mechanism 4 also includes a movable groove 43 opened in the guide rail 41, the movable block 42 is embedded in the movable groove 43 and can slide along the optical axis; the locking component includes a fixing screw 44 passing through the movable block 42 and a nut 45 threadedly engaged with the fixing screw 44, and the movable block 42 is pressed against the guide rail 41 by tightening the nut 45 to achieve positioning.

[0027] It should be noted that the moving groove 43 is a T-shaped or rectangular groove set on the surface of the guide rail 41, with a precision grade of IT6, and is precision ground. The bottom of the moving block 42 is provided with a boss that matches the moving groove 43, and the surface of the boss is coated with molybdenum disulfide grease to reduce friction. The fixing screw 44 is made of alloy steel with a strength grade of 8.8 or higher, and the specifications can be selected according to the actual stress conditions. The nut 45 is equipped with an anti-loosening washer, such as a spring washer or a nylon self-locking nut. In practical applications, other fasteners with anti-loosening structures can also be selected for this component, which is not limited in this embodiment. During installation, the moving block 42 is placed into the moving groove 43, the fixing screw 44 is inserted and the nut 45 is screwed on. After the lens position is adjusted, the nut 45 is tightened with a wrench. The friction between the nut 45 and the end face of the moving block 42 and the radial tightening force of the screw rod are used to firmly lock the moving block 42 onto the guide rail 41. The working principle of this structure is that the huge axial clamping force generated by the screw pair is converted into static friction between the contact surface of the moving block 42 and the guide rail 41, thereby resisting the influence of external vibration and gravity. The effect of this technology is that it ensures that the lens assembly 3 can maintain its position for a long time after adjustment, avoids optical axis deviation caused by equipment operation vibration, and ensures the repeatability and consistency of the test results.

[0028] To simplify the installation and disassembly process of the cover 6 and improve operational convenience, this application provides a detailed description of the specific implementation of the disassembly and assembly mechanism 5. Please refer to... Figure 1-5 As shown, the disassembly and assembly mechanism 5 also includes a mounting groove 52 and a baffle 53 symmetrically arranged at the ends of the outer shell 2; the elastic element is a spring 54, one end of which abuts against the bottom of the mounting groove 52 and the other end of which abuts against the baffle 53; the buckle 51 is connected to the side of the baffle 53 away from the spring 54, the end of the buckle 51 is provided with a bevel, and the inner circumferential surface of the cover 6 is provided with a slot that matches the buckle 51. When the cover 6 is pressed to the end of the outer shell 2, the buckle 51 retracts along the bevel and springs into the slot to lock.

[0029] It should be noted that the mounting slot 52 consists of two blind holes symmetrically machined on the end face of the outer shell 2, and the baffle 53 is an arc-shaped metal sheet fixed to the top of the spring 54 with screws. The spring 54 is a stainless steel compression spring with good corrosion resistance and fatigue life. The buckle 51 is a hook-shaped part made of hard stainless steel or engineering plastic, fixed to the baffle 53 by welding or screwing. The angle of its end bevel is calculated to balance the pushing force and locking force. The cover 6 is a transparent or semi-transparent dust cover, and the inner circumference is formed into an annular groove by injection molding or machining. During operation, the cover 6 is aligned with the end of the outer shell 2 and pressed down. The bevel of the buckle 51 is squeezed by the edge of the cover 6, which forces the baffle 53 to compress the spring 54 inward. When the groove of the cover 6 moves to the position of the buckle 51, the spring 54 returns to its original position and pushes the buckle 51 into the groove. A "click" sound indicates that it is locked. To disassemble, simply pull the cover 6 outward or press the baffle 53 to release the buckle 51. The structure works by using the elastic potential energy of spring 54 to drive buckle 51 to achieve automatic locking and manual unlocking. The advantage of this technology is that it enables quick one-handed operation of the cover 6, allowing for lens protection or exposure without tools, greatly improving the efficiency of on-site maintenance and cleaning.

[0030] To enhance the lens's external impact resistance and grip stability, this application details the specific construction of the protective component 7. Please refer to... Figure 1-5 As shown, the buffer layer in the protective component 7 is a rubber pad 71, and the anti-slip layer is a protective plate 72 fixed to the outside of the rubber pad 71; the outer surface of the protective plate 72 is provided with a number of anti-slip patterns 73 arranged at equal intervals, and the anti-slip patterns 73 extend along the axial or circumferential direction of the outer shell 2.

[0031] It should be noted that the rubber pad 71 is made of nitrile rubber (NBR) or silicone rubber, and is formed into a cylindrical shape through a molding process. It is tightly attached to the surface of the outer shell 2, providing good shock absorption and oil resistance. The protective plate 72 is made of rolled aluminum alloy sheet and is fixed to the outside of the rubber pad 71 by strong adhesive or clamp structure. The anti-slip texture 73 is a raised stripe formed on the surface of the protective plate 72 by knurling or laser engraving, with uniform depth and neat arrangement. In practical applications, polycarbonate or other high-strength engineering plastics can also be used as the protective plate material, and this application embodiment does not limit this. The working principle of this structure is: when the lens is subjected to external impact, the rubber pad 71 undergoes elastic deformation to absorb the impact energy, preventing the force from being directly transmitted to the internal precision optical components; the anti-slip texture 73 increases the coefficient of friction between the hand and the lens surface, preventing slippage during operation. The effect of this technology is: it effectively protects the internal structure of the lens from damage caused by accidental drops or collisions, while providing a comfortable grip, reducing the risk of operational errors, and extending the service life of the equipment.

[0032] To precisely control optical performance and ensure material consistency, this application specifies the specific optical parameters of the lens materials. Specifically, the refractive index of the fused silica material is 1.46±0.02, and the Abbe number is 67.5±1.5; the refractive index of the calcium fluoride material is 1.43±0.02, and the Abbe number is 95±2.

[0033] It should be noted that the above parameters refer to typical values ​​in the ultraviolet band (such as 365nm or 254nm). When purchasing optical raw materials, suppliers should be required to provide detailed optical testing reports to ensure that the refractive index and Abbe number of each batch fall within the above range. For example, a specific batch of synthetic fused silica may be selected, with a refractive index between 1.44 and 1.48 and an Abbe number between 66.0 and 69.0; optical-grade calcium fluoride crystal may be selected, with a refractive index between 1.41 and 1.45 and an Abbe number between 93 and 97. In practical applications, other optical material grades that conform to this parameter range can also be selected for this component, and this application embodiment does not limit this. The working principle of this parameter limitation is: by strictly controlling the refractive index and dispersion coefficient of the material, the accuracy of the optical design model is ensured, so that the performance of the actually manufactured lens is consistent with the design expectation. The effect of this technology is: to eliminate the fluctuation in imaging quality caused by batch differences in materials, to ensure the consistency and high precision of mass-produced lenses, and to meet the stringent requirements of high-end machine vision inspection.

[0034] To further optimize the optical path quality and protect the core optical components, this application improves the auxiliary structure inside the housing 2. Please refer to... Figure 1-5 As shown, an aperture stop 22 is also provided inside the housing 2, and the aperture stop 22 is located between the lens assembly 3 and the end of the housing 2; a glass lens 8 is also installed at the end of the housing 2, and the cover 6 of the disassembly and assembly mechanism 5 is used to cover the outside of the glass lens 8.

[0035] It should be noted that the aperture 22 is a thin sheet made of black anodized aluminum with a precision circular hole in the center. It is fixed to the inner wall of the housing 2 by threads or bayonet to block stray light and improve image contrast. The glass lens 8 is a plano-convex or bi-convex protective window made of ultraviolet fused silica, and is fixed to the threaded interface at the front end of the housing 2 by a pressure ring. The cover 6 is designed with the external dimensions of the glass lens 8 in mind to ensure that it does not touch the lens surface when covered. In practical applications, other forms of light-absorbing structures or protective window fixing methods can also be selected for this component, which are not limited in this embodiment. The working principle of this structure is as follows: the aperture 22 restricts non-imaging beams from entering the sensor, reducing glare and ghosting; the glass lens 8 acts as the first line of defense against dust and moisture; and the cover 6 provides secondary protection when not in operation. The effect of this technology is that it significantly improves image sharpness and signal-to-noise ratio, while constructing a multi-layer protection system to ensure that the lens can maintain the cleanliness and integrity of the internal optical path even in harsh environments.

[0036] To ensure the adjustment mechanism has a reasonable stroke and reliable operation, this application specifies the key dimensional parameters of adjustment mechanism 4. Please refer to... Figure 1-5 As shown, the length of the guide rail 41 is 60% to 80% of the length of the housing 2; the moving block 42 has a travel range of 0 mm to 20 mm along the guide rail 41; the fixing screw 44 has a specification of M3 to M5, and the nut 45 is equipped with an anti-loosening washer.

[0037] It should be noted that the length of the guide rail 41 is calculated proportionally based on the total length of the housing 2. For example, if the housing 2 is 100mm long, the guide rail 41 is designed to be 60mm to 80mm long to ensure sufficient support rigidity. The travel distance of 0-20mm covers the focusing and zooming needs of most ultraviolet lenses, and overtravel is prevented by limit blocks or mechanical stops. The fixing screws 44 are selected from standard M3, M4, or M5 parts, depending on the size of the moving block 42 and the required tightening force. Anti-loosening washers ensure that they do not loosen under high-frequency vibration. In practical applications, this component can also be adjusted according to the specific lens size, but this embodiment does not limit this. The working principle of this parameter setting is to provide sufficient optical adjustment range and mechanical connection strength while ensuring a compact structure. The effect of this technology is that it not only meets the focusing needs under different working conditions, but also avoids the problems of poor stability caused by an excessively short guide rail 41 or insufficient tightening force caused by an excessively small screw, thus achieving the best balance between structure and function.

[0038] To ensure the responsiveness and locking reliability of the disassembly / assembly mechanism 5, this application quantifies the elastic elements and mating dimensions of the disassembly / assembly mechanism 5. Please refer to... Figure 1-5 As shown, the wire diameter of spring 54 is 0.5mm to 1.0mm, and the elastic coefficient is 5N / mm to 10N / mm; the bevel angle of the end of buckle 51 is 30° to 45°; and the depth of the groove on cover 6 is 2mm to 5mm.

[0039] It should be noted that the selection of spring wire diameter and elastic coefficient must balance the pressing force and rebound force. A wire diameter that is too thin is prone to breakage, while a wire diameter that is too thick makes operation difficult. The bevel angle is designed to be between 30° and 45°, ensuring that the cover 6 can be smoothly pressed in while providing sufficient axial force to prevent accidental dislodgement. The depth of the slot must be greater than the protruding height of the buckle 51 to ensure proper locking. In practical applications, the above parameters can be finely adjusted according to tactile requirements; this embodiment does not limit this. The working principle of these parameter settings is: through mechanical matching design, the buckle mechanism achieves the optimal balance between operating force and locking force. The effect of this technology is: providing smooth and clear tactile feedback, preventing operational difficulties caused by an overly stiff spring 54 or accidental dislodgement caused by an overly shallow slot, thus improving user experience and connection reliability.

[0040] To optimize the cushioning performance and anti-slip effect of the protective component 7, this application specifies the material thickness and texture parameters of the protective component 7. Please refer to... Figure 1-5 As shown, the rubber pad 71 has a thickness of 3mm to 8mm and a Shore hardness of 40HA to 60HA; the protective plate 72 is made of aluminum alloy and has a thickness of 1mm to 3mm; the anti-slip texture 73 has a depth of 0.5mm to 1.0mm and a spacing of 3mm to 5mm between adjacent anti-slip textures 73.

[0041] It should be noted that the rubber pad 71 has a moderate thickness to provide effective cushioning without adding excessive volume, and its hardness of 40-60HA balances softness and support; the aluminum alloy protective plate 72 is thin yet strong; the depth and spacing of the anti-slip texture 73 are ergonomically optimized to ensure comfortable gripping. In practical applications, these values ​​can be adjusted according to specific protection level requirements, but this embodiment does not limit this. The working principle of this parameter setting is: using rubber with specific hardness and thickness to absorb impact kinetic energy, and using anti-slip texture 73 with a specific geometric shape to increase frictional resistance. The effect of this technology is: achieving optimal shock absorption and anti-slip effect within a limited space, effectively protecting the precision lens from physical damage, while improving operational safety and comfort.

[0042] The above description is merely a few embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A low-distortion, high-precision, adjustable protective ultraviolet lens for machine vision, characterized in that, include: Connecting plate (1); The outer shell (2) is fixedly connected to the connecting plate (1) on one side, and the inner side of the outer shell (2) is provided with a groove (21) extending along the optical axis. The lens assembly (3), which is disposed in the groove (21), includes at least one negative diopter lens and at least one positive diopter lens arranged sequentially along the optical axis; An adjustment mechanism (4) is provided on the housing (2). The adjustment mechanism (4) includes a guide rail (41), a moving block (42), and a locking member. The guide rail (41) is located on the outside or inside of the housing (2) and defines a moving trajectory. The moving block (42) is connected to at least a portion of the lenses in the lens assembly (3) and is slidably fitted to the guide rail (41). The locking member is used to fix the moving block (42) at any position on the guide rail (41). A disassembly / assembly mechanism (5) is provided at the end of the outer casing (2). The disassembly / assembly mechanism (5) includes an elastic element and a buckle (51). The buckle (51) has an engaged state and an unlocked state under the action of the elastic element, and is used to detachably fix a cover (6); and The protective component (7) covers the outer surface of the outer shell (2) and includes a buffer layer and an anti-slip layer disposed on the outside of the buffer layer.

2. The adjustable protective precision machine vision ultraviolet lens according to claim 1, characterized in that, The lens assembly (3) includes five spherical lenses, which are arranged along the optical axis from the object side to the image side as follows: first lens (31), second lens (32), third lens (33), fourth lens (34) and fifth lens (35). Among them, the first lens (31), the third lens (33) and the fifth lens (35) are negative diopter lenses, and the second lens (32) and the fourth lens (34) are positive diopter lenses; The negative diopter lens is made of fused silica, and the positive diopter lens is made of calcium fluoride.

3. The adjustable protective precision machine vision ultraviolet lens according to claim 1, characterized in that, The adjustment mechanism (4) further includes a moving groove (43) opened in the guide rail (41), and the moving block (42) is embedded in the moving groove (43) and can slide along the optical axis. The locking element includes a fixing screw (44) that passes through the movable block (42) and a nut (45) that is threaded into the fixing screw (44). By tightening the nut (45), the movable block (42) is pressed against the guide rail (41) to achieve positioning.

4. The adjustable protective precision machine vision ultraviolet lens according to claim 1, characterized in that, The disassembly and assembly mechanism (5) also includes mounting grooves (52) and baffles (53) symmetrically arranged at the ends of the outer shell (2); The elastic element is a spring (54), one end of which abuts against the bottom of the mounting groove (52), and the other end abuts against the baffle (53). The buckle (51) is connected to the side of the baffle (53) away from the spring (54). The end of the buckle (51) is provided with a bevel. The inner circumferential surface of the cover (6) is provided with a slot that matches the buckle (51). When the cover (6) is pressed to the end of the outer shell (2), the buckle (51) retracts along the bevel and springs into the slot to lock.

5. The adjustable protective precision machine vision ultraviolet lens according to claim 1, characterized in that, The buffer layer in the protective component (7) is a rubber pad (71), and the anti-slip layer is a protective plate (72) fixed to the outside of the rubber pad (71). The outer surface of the protective plate (72) is provided with a plurality of anti-slip patterns (73) arranged at equal intervals, and the anti-slip patterns (73) extend along the axial or circumferential direction of the outer shell (2).

6. The adjustable protective precision machine vision ultraviolet lens according to claim 2, characterized in that, The refractive index of the fused silica material is 1.46±0.02, and the Abbe number is 67.5±1.

5. The refractive index of the calcium fluoride material is 1.43±0.02, and the Abbe number is 95±2.

7. The adjustable protective precision machine vision ultraviolet lens according to claim 1, characterized in that, An aperture stop (22) is also provided inside the housing (2), and the aperture stop (22) is located between the lens assembly (3) and the end of the housing (2); The end of the housing (2) is also fitted with a glass lens (8), and the mounting and disassembly mechanism (5) is used to fix the cover (6) covering the outside of the glass lens (8).

8. The adjustable protective precision machine vision ultraviolet lens according to claim 3, characterized in that, The length of the guide rail (41) is 60% to 80% of the length of the outer casing (2); The moving block (42) has a travel range of 0 mm to 20 mm along the guide rail (41); The fixing screw (44) is of size M3 to M5, and the nut (45) is equipped with an anti-loosening washer.

9. The adjustable protective precision machine vision ultraviolet lens according to claim 4, characterized in that, The spring (54) has a wire diameter of 0.5 mm to 1.0 mm and an elastic modulus of 5 N / mm to 10 N / mm; The bevel angle at the end of the buckle (51) is 30° to 45°; The depth of the slot on the cover (6) is 2mm to 5mm.

10. The adjustable protective precision machine vision ultraviolet lens according to claim 5, characterized in that, The thickness of the rubber pad (71) is 3 mm to 8 mm, and the Shore hardness is 40 HA to 60 HA; The protective plate (72) is made of aluminum alloy and has a thickness of 1mm to 3mm; The anti-slip texture (73) has a depth of 0.5 mm to 1.0 mm and a spacing of 3 mm to 5 mm between adjacent anti-slip textures.

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