Miniature optical lens mounting structure for AR display

Abstract

The utility model discloses AR display with miniature optical lens mounting structure relates to the field of augmented reality AR display technology. AR display with miniature optical lens mounting structure, including titanium alloy mounting frame, its upper and lower side fixed pure copper flat microchannel liquid cooling pipe (containing 3 parallel flow channel), four corners are equipped with sliding block slot, and the left and right sides are equipped with positioning boss, and the rear side is connected optical window, and the optical window is pasted diffraction grating layer (outside integration sub -wavelength moth eye antireflection structure, and the inside is equipped with complementary grating), and the two are with the point glue curing area, and diffraction grating layer passes through JSR. AR NIL ultraviolet glue bonding silicon carbide optical lens (integration aspherical micro lens array and tilt grating) of - NIL, AR display with miniature optical lens mounting structure light transmittance is equal to or more than 90%, and the lens thickness is less than 1.5mm, and the temperature rise is controlled within 5 DEG C, and adapts industrial grade -10 DEG C~50 DEG C working condition, and is compatible with wafer level mass production, and can be widely applied to AR display equipment.

Description

Technical Field

[0001] This utility model relates to the field of augmented reality (AR) display technology, and in particular to a micro-optical lens mounting structure for AR displays. Background Technology

[0002] In recent years, augmented reality (AR) technology has shown great application potential in many fields such as entertainment, industry, education, and healthcare due to its ability to integrate virtual information with the real world in real time, becoming a research hotspot in the global technology field. As users' requirements for AR experience continue to increase, the performance of AR display devices is facing severe challenges, especially in the optical display part, where traditional technical solutions have exposed a series of problems that urgently need to be solved.

[0003] In terms of optical performance, the transmittance and thickness issues of traditional AR lenses are particularly prominent. The transmittance of traditional diffractive waveguide solutions is generally ≤85%, which results in insufficient brightness and color saturation of the final image presented to the user, seriously affecting the visual experience. At the same time, the overall thickness of the lens is ≥1.8mm, making it difficult to achieve a thinner and lighter AR device, greatly reducing wearing comfort. Taking common glass lenses as an example, although they have high transmittance, they are heavy, which is not conducive to the portability of the device. Plastic lenses are lightweight, but it is difficult to guarantee high transmittance. The two cannot be balanced, making it difficult to meet the current improvement requirements of "transmittance ≥90% and thickness <1.5mm".

[0004] From the perspective of mass production compatibility, the design and manufacturing process of traditional AR lenses are not conducive to large-scale production. For example, the utilization rate of traditional circular lenses is only 60% during wafer processing, and they are difficult to directly adapt to existing mainstream nanoimprinting equipment. Additional modifications to the equipment are required, which not only increases production costs but also reduces production efficiency, greatly limiting the large-scale commercialization of AR devices.

[0005] Furthermore, in complex application environments such as industrial applications, the stability and protection capabilities of traditional AR display structures are insufficient. On the one hand, traditional structures have poor thermal stability. During operation, the heat generated by the MicroOLED optomechanical system is difficult to dissipate effectively, leading to temperature rise, causing grating period drift, and thus affecting image quality. On the other hand, their protection level is low, making it difficult to resist interference from external factors such as dust and moisture. They cannot meet the complex operating conditions of industrial applications, ranging from -10℃ to 50℃, and their long-term operational stability is poor. Utility Model Content

[0006] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a micro-optical lens mounting structure for AR displays that can solve the above-mentioned problems.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a micro-optical lens mounting structure for AR displays, comprising a titanium alloy mounting frame, wherein microchannel liquid cooling tubes are fixedly connected to the upper and lower sides of the titanium alloy mounting frame, and three parallel flow channels are arranged along the length of the microchannel liquid cooling tubes. Slider slots are respectively provided at the four corners of the titanium alloy mounting frame, and positioning bosses are fixedly connected to the left and right side walls of the titanium alloy mounting frame. An optical window is fixedly connected to the side of the titanium alloy mounting frame away from the user's field of vision.

[0008] A diffraction grating layer is fixedly attached to the side of the optical window away from the titanium alloy mounting frame. A dispensing curing area is provided between the contact edge of the optical window and the diffraction grating layer. The dispensing curing area is fixedly connected to the optical window and the diffraction grating layer respectively. A silicon carbide optical lens is fixedly attached to the side of the diffraction grating layer away from the optical window.

[0009] Preferably, JSR·AR-NIL UV adhesive is sandwiched between the diffraction grating layer and the silicon carbide optical lens, and the JSR·AR-NIL UV adhesive is bonded and fixed to the diffraction grating layer and the silicon carbide optical lens respectively.

[0010] Preferably, a fluororubber sealing ring is provided on the outer periphery of the diffraction grating layer, one side of the fluororubber sealing ring is fixedly connected to the titanium alloy mounting frame, and the other side of the fluororubber sealing ring is tightly fitted to the edge of the diffraction grating layer.

[0011] Preferably, a graphene heat dissipation film is sandwiched between the titanium alloy mounting frame and the diffraction grating layer, and the graphene heat dissipation film is respectively attached and fixed to the titanium alloy mounting frame and the diffraction grating layer.

[0012] Preferably, each of the slider slots is movably connected to an elastic slider, and a tenon is fixedly connected to the side of the elastic slider facing the titanium alloy mounting frame. The titanium alloy mounting frame has a mortise corresponding to the position of the tenon.

[0013] Preferably, the tenon and the mortise engage with each other, and the side of the elastic slider away from the tenon is pressed and fixed against the edge of the diffraction grating layer.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] (1) The AR display uses a micro-optical lens mounting structure. The silicon carbide optical lens has an integrated design of "aspherical microlens array + tilted grating structure" (0.8mm thick substrate to achieve dual function). Combined with the "subwavelength moth's eye anti-reflection structure" of the diffraction grating layer (400-750nm band reflectivity <0.5%) and the refractive index of JSR·AR-NIL UV adhesive (1.9), the transmittance is increased to ≥90%, which is more than 5 percentage points higher than the traditional diffraction waveguide solution (transmittance ≤85%). At the same time, the silicon carbide optical lens adopts a 25mm×30mm rectangular substrate and a four-corner R1mm rounded corner design, which is compatible with the 8-inch wafer "whole plate processing-batch cutting" process (a single wafer can be cut into ≥100 pieces, while the utilization rate of traditional circular lenses is only 60%). It is also directly compatible with the existing EVG520HE nanoimprint equipment of Wanzai Nanji Light without additional modification.

[0016] (2) The AR display uses a micro-optical lens mounting structure, and a graphene heat dissipation film (contact thermal resistance ≤ 0.05℃·cm). 2 The system rapidly conducts heat from optical components to the titanium alloy mounting frame. A pure copper microchannel liquid cooling pipe (three 0.5mm diameter channels, improving heat dissipation efficiency by 49% compared to traditional circular liquid cooling pipes) actively carries away heat through convection, keeping the temperature rise of the MicroOLED optical engine (0.8W power consumption) below 5°C. This is 66.7% lower than traditional passive cooling solutions (15°C temperature rise), preventing grating period drift caused by high temperatures. Furthermore, the difference in thermal expansion between the titanium alloy mounting frame (coefficient of thermal expansion 8.6ppm / °C) and the silicon carbide optical lens (2.6ppm / °C) is only 6ppm / °C, 70% lower than the traditional aluminum alloy frame (difference 20.4ppm / °C), reducing component misalignment caused by temperature fluctuations. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the mounting structure of the miniature optical lens for AR display according to this utility model;

[0019] Figure 2 This is a schematic diagram of the mounting structure of the miniature optical lens for AR display according to this utility model;

[0020] Figure 3 This utility model Figure 1 Enlarged view of point A in the middle;

[0021] Figure 4 This utility model Figure 1 Enlarged view of point B in the middle;

[0022] Figure 5 This utility model Figure 2 Enlarged diagram of point C in the middle.

[0023] Reference numerals: 1. Microchannel liquid cooling tube; 2. Titanium alloy mounting frame; 3. Slider slot; 4. Silicon carbide optical lens; 5. Diffraction grating layer; 6. Positioning boss; 7. Elastic slider; 8. Optical window; 9. Dispensing and curing area; 10. JSR·AR-NIL UV adhesive; 11. Fluororubber sealing ring; 12. Graphene heat dissipation film; 13. Parallel flow channel; 14. Tenon; 15. Tenon. Detailed Implementation

[0024] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0025] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0027] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0028] Please see Figure 1-5This utility model provides a technical solution: a micro-optical lens mounting structure for AR displays, including a titanium alloy mounting frame 2. Microchannel liquid cooling tubes 1 are fixedly connected to the upper and lower sides of the titanium alloy mounting frame 2, and three parallel flow channels 13 are provided on the microchannel liquid cooling tubes 1. Slider slots 3 are provided at the four corners of the titanium alloy mounting frame 2. Positioning bosses 6 are fixedly connected to the left and right sides of the titanium alloy mounting frame 2, and an optical window 8 is fixedly connected to the rear side of the titanium alloy mounting frame 2. The microchannel liquid cooling tubes 1 are made of pure copper flat tubes (25mm × 2mm × 0.3mm), and three parallel flow channels 13 (0.5mm in diameter) are provided inside the tubes, with a cross-sectional area of ​​0.58mm². 2 Compared to traditional circular liquid cooling tubes (cross-sectional area 0.39mm²), 2 It improves heat dissipation efficiency by 49%, which can quickly remove the 0.8W of heat generated by the MicroOLED optical engine and keep the temperature rise within 5℃ (compared to 15℃ for traditional passive heat dissipation). At the same time, the microchannel liquid cooling pipe 1 is attached to the outer long side (non-user view side) of the titanium alloy mounting frame 2, with a thickness of only 0.3mm, without increasing the overall thickness of the module, and adapts to the "ultra-thin" improvement requirements.

[0029] A diffraction grating layer 5 is fixedly connected to the optical window 8. The diffraction grating layer 5 integrates a "subwavelength moth-eye structure" (200nm period, honeycomb arrangement) on the outer side, achieving broadband antireflection (reflectivity <0.5% in the 400-750nm band) through a nanoscale structure, reducing reflection loss by more than 50% compared to traditional solutions and directly improving light transmittance. At the same time, a "complementary grating structure" is replicated on the inner side of the diffraction grating layer 5, forming a "concave-convex match" with the grating of the silicon carbide optical lens 4. After bonding, the grating period deviation is ≤±2μm, solving the optical path offset problem caused by traditional "planar bonding". A dotted adhesive curing area 9 is fixedly connected between the optical window 8 and the diffraction grating layer 5. The silicon carbide optical lens 4 is fixedly connected to the diffraction grating layer 5. The silicon carbide optical lens 4 adopts a rectangular substrate (25mm×30mm) and a four-corner rounded R1mm design, which is compatible with the 8-inch wafer "whole board processing-batch cutting" process (single-wafer). The wafer can be cut into ≥100 pieces (the utilization rate of traditional circular lenses is only 60%), and stress concentration during assembly is avoided. It is perfectly matched with the worktable size of the existing nanoimprint equipment (EVG520HE) at the Wanzai Antarctic Light Jiangxi Base, without the need for additional equipment modification. The "aspherical microlens array (focusing light) + tilted grating structure (light path adjustment)" is integrated on the same 0.8mm thick silicon carbide substrate (i.e., silicon carbide optical lens 4). Through "one lens with two functions", ultra-thinness is achieved (thickness reduction of 55.6%). At the same time, by utilizing the high refractive index (2.6-2.7) and low expansion characteristics (2.6ppm / ℃) of silicon carbide, the contradiction between the traditional glass lens "high transmittance but heavy" and the plastic lens "light but low transmittance" is solved. It directly meets the improvement requirements of "transmittance ≥90% and thickness <1.5mm". JSR·AR-NIL UV adhesive 10 is fixedly connected between the diffraction grating layer 5 and the silicon carbide optical lens 4.

[0030] A fluororubber sealing ring 11 is provided on the outer side of the diffraction grating layer 5. The fluororubber sealing ring 11 is fixedly connected to the titanium alloy mounting frame 2. A graphene heat dissipation film 12 is fixedly connected between the titanium alloy mounting frame 2 and the diffraction grating layer 5. The graphene heat dissipation film 12 is made of 50 layers of flexible graphene film (thickness 0.05mm, bending radius 5mm), and coated on one side with nano-silver thermal conductive paste (thickness 10μm). The adhesion between the graphene heat dissipation film 12 and the titanium alloy mounting frame 2 and the diffraction grating layer 5 is ≥95% (no air bubbles), and the contact thermal resistance is ≤0.05℃·cm. 2 / W, compared to traditional copper foil heat sinks (contact thermal resistance 0.2℃·cm) 2 / W) is reduced by 75%, while the graphene heat dissipation film 12 only covers the wall thickness area (non-optical area) of the titanium alloy mounting frame 2 to avoid blocking the light path.

[0031] The three-layer bonding of "grating of silicon carbide optical lens 4 - grating of JSR·AR-NIL UV adhesive 10 - grating of diffraction grating layer 5" is achieved by using JSR·AR-NIL UV adhesive 10 (thickness 10μm±1μm). The refractive index of JSR·AR-NIL UV adhesive 10 (1.9) precisely matches the refractive index difference between silicon carbide optical lens 4 (2.6-2.7) and diffraction grating layer 5 (quartz glass, 1.458), avoiding interface reflection loss (traditional adhesive layer reflection loss is 2%-3%). At the same time, JSR· AR-NIL UV adhesive 10 forms a closed-loop seal in the "gratingless transition zone" and forms a "double seal" with the fluororubber sealing ring 11, making the IP54 protection level more reliable (traditional single-layer seal has 30% poorer dust and water resistance). The coaxiality of the cross reference axis of silicon carbide optical lens 4 and diffraction grating layer 5 is ≤±2μm. Combined with the high Abbe number (≥35) of silicon carbide optical lens 4 and the quartz glass (Abbe number 67) of diffraction grating layer 5, a dispersion compensation system is formed, reducing the intensity of the rainbow effect from the traditional 20% to below 5%.

[0032] An elastic slider 7 is movably connected to the slider slot 3, and a tenon 15 is fixedly connected to the elastic slider 7. A mortise 14 is provided on the titanium alloy mounting frame 2, and the tenon 15 is connected to the mortise 14. The titanium alloy mounting frame 2 is made of TC4 titanium alloy (density 4.51 g / cm³). 3 With a hollow structure (wall thickness 0.8mm), the frame weighs only 2.1g, a 40% reduction compared to the traditional aluminum alloy frame (3.5g). The titanium alloy mounting frame 2 integrates the "optical window 8 (supporting the diffraction grating layer 5)," "slider slot 3 (fixing the elastic slider 7)," and "positioning boss 6 (connecting the lens frame)" into a single frame, achieving "single reference" positioning (coaxiality ≤ ±10μm). The thermal expansion coefficient of the titanium alloy mounting frame 2 (8.6ppm / ℃) differs from that of the silicon carbide optical lens 4 (2.6ppm / ℃) by only 6ppm / ℃, a 70% reduction compared to the difference between traditional aluminum alloy (23ppm / ℃) and silicon carbide (20.4ppm / ℃). This avoids part misalignment caused by temperature fluctuations and is suitable for industrial-grade operating conditions of -10℃ to 50℃.

[0033] Working principle: The imaging beam (400-750nm visible light) emitted by the MicroOLED optical engine is incident perpendicularly on the light incident surface (inner side) of the silicon carbide optical lens 4. The aspherical microlens array on the surface of the lens modulates the beam for the first time. The divergent beam is calibrated into parallel light through the focusing effect of the microlens. At the same time, the high refractive index (2.6-2.7) of silicon carbide is used to reduce beam loss and ensure the initial transmittance.

[0034] The calibrated beam penetrates the silicon carbide optical lens 4 and reaches the tilted grating structure (period 300nm±10nm, tilt angle 25°±0.5°) on its light-emitting surface (outer side). At this time, the beam enters the diffraction grating layer 5 through the JSR·AR-NIL UV adhesive 10 (thickness 10μm±1μm). Since the refractive index (1.9) of the UV adhesive is precisely matched with that of silicon carbide and the diffraction grating layer (quartz glass, refractive index 1.458), the beam has no interface reflection loss. The "complementary grating structure" on the inner side of the diffraction grating layer works synergistically with the silicon carbide lens grating to expand the beam in two dimensions (to achieve a large field of view). The "subwavelength moth-eye anti-reflection structure" (period 200nm) on the outer side further suppresses ambient light reflection, ultimately increasing the transmittance to ≥90%.

[0035] Meanwhile, the high Abbe number of the silicon carbide lens (≥35 after hybrid design) and the quartz glass material of the diffraction grating layer (Abbe number 67) form dispersion compensation, avoiding the rainbow effect in beam propagation and ensuring uniform imaging color;

[0036] The beam that completes pupil expansion and dispersion compensation penetrates the diffraction grating layer 5 and is directly transmitted to the user's eyes. The user can clearly observe the AR virtual image superimposed on the real scene. Moreover, due to the coaxiality error of the optical components being ≤±5μm (as guaranteed by mechanical fixation later), the image is free from offset or distortion.

[0037] The titanium alloy mounting frame 2 serves as the reference carrier for the entire structure. Its positioning bosses 6 (diameter 2mm, height 0.3mm) on the left and right sides are precisely matched with the positioning holes (tolerance H7) of the AR glasses frame to achieve coarse positioning of the module as a whole (coaxiality ≤ ±10μm). The optical window 8 on the rear side of the frame (the size matches the diffraction grating layer 5) provides a mounting reference surface for optical components, ensuring that the central axis of the diffraction grating layer 5 and the silicon carbide optical lens 4 is consistent with the reference axis of the frame.

[0038] The elastic slider 7 is movably connected to the slider slot 3 of the titanium alloy mounting frame 2 through the "tenon 15-mortise 14" structure: During assembly, the elastic slider 7 is embedded into the slot, and the tenon 15 at one end of the slider engages with the mortise 14 on the frame (barbed complementary design) to form a mechanical self-locking. The "arc-shaped pressing surface" (radius 1.5mm) at the other end of the slider is tightly fitted to the edge of the diffraction grating layer 5 (the area without grating) and provides a preload force of 0.5N±0.1N. This preload force can prevent the diffraction grating layer 5 and silicon carbide optical lens 4 from loosening under vibration or temperature difference environment. Also, because the pressing surface is arc-shaped and the pressure is uniform, it avoids surface distortion of the parts (ensuring optical accuracy).

[0039] The dispensing curing area 9 (3MDP460 epoxy resin adhesive, 24 dots) is located between the optical window 8 and the diffraction grating layer 5, covering the gap area not covered by the elastic slider 7. After the adhesive cures (hardness Shore D85, shrinkage rate <1%), it forms a double fixation of "clamping + bonding" with the elastic slider 7, further improving the structural stability. On the other hand, it forms a closed-loop seal at the edge of the optical window 8 to prevent dust or moisture from entering the optical area, while also helping to ensure the IP54 protection level.

[0040] When the AR display is running, the heat (0.8W) generated by the MicroOLED optical engine is conducted through the air to the silicon carbide optical lens 4, and then transferred through the diffraction grating layer 5 to the graphene heat dissipation film 12 (clamped between the titanium alloy mounting frame 2 and the diffraction grating layer 5). Due to the high thermal conductivity (300W / m·K) and the adhesion of the graphene heat dissipation film 12 (with no air bubbles) of more than 95%, the heat can be quickly diffused laterally to the entire film surface, and then transferred to the titanium alloy mounting frame 2 (TC4 titanium alloy with a thermal conductivity of 16.8W / m·K) through the contact between the film and the frame, completing the first stage of heat conduction from "optical components → heat dissipation film → frame".

[0041] The heat transferred to the titanium alloy mounting frame 2 is ultimately absorbed by the microchannel liquid cooling pipes 1 fixed on the upper and lower sides of the frame. The cooling medium (such as ethylene glycol solution) circulating in the three parallel flow channels 13 (0.5 mm in diameter, 0.5 mm apart) within the liquid cooling pipes carries away the heat through thermal convection. Because the contact length between the liquid cooling pipes and the frame is 20 mm, and the contact thermal resistance is reduced (≤0.05℃·cm) by thermally conductive adhesive (5 μm thick), the heat is effectively absorbed. 2 / W), which can quickly control the frame temperature within room temperature +5℃, avoiding grating period drift (>10nm) or component deformation caused by high temperature;

[0042] The fluororubber sealing ring 11 (0.5mm×0.5mm cross section, with a 30° inclined lip) is embedded in the groove of the titanium alloy mounting frame 2. Its lip is tightly attached to the edge side of the diffraction grating layer 5 (compression amount 20%) to form an elastic seal: on the one hand, it prevents external dust and moisture from entering the optical area (meeting IP54 protection, no leakage after 30 minutes of water spraying), and on the other hand, it isolates the temperature conduction interference between the frame and the optical components, ensuring the temperature stability of the optical components (avoiding stress deformation caused by temperature difference).

[0043] Structural Description:

[0044] Microchannel liquid cooling pipe 1: As the core heat dissipation component of the module, it is fixedly connected to the upper and lower long sides of the titanium alloy mounting frame 2, fitting against the outer side of the frame in the area not visible to the user. It is made of pure copper flat tube structure, with external dimensions of 25mm × 2mm × 0.3mm (length × width × thickness). Three parallel flow channels 13 with a diameter of 0.5mm are arranged along the length of the tube, with a total cross-sectional area of ​​0.58mm². 2 With its flat structure (only 0.3mm thick), it does not increase the overall thickness of the module, making it suitable for ultra-thin applications. Utilizing pure copper material and a multi-channel design, its heat dissipation efficiency is improved by 49% compared to traditional circular liquid cooling pipes. It can quickly remove the 0.8W of heat generated by the MicroOLED optical engine, keeping the module temperature rise below 5℃. This prevents high temperatures from causing grating period drift or component deformation. At the same time, its installation on the non-user field of view side can prevent obstruction of the light path and ensure imaging effect.

[0045] Titanium alloy mounting frame 2: As the reference carrier and core support of the entire mounting structure, it is made of TC4 titanium alloy through hollow processing. The frame has a lightweight rectangular structure with a wall thickness of 0.8mm and a weight of only 2.1g (40% lighter than the traditional aluminum alloy frame). It integrates multi-functional mounting positions through "single reference", avoiding the reference deviation caused by the splicing of multiple parts in the traditional way. Utilizing the low expansion characteristics of titanium alloy (thermal expansion coefficient 8.6ppm / ℃), the difference between the thermal expansion coefficient of silicon carbide optical lens 4 (2.6ppm / ℃) and the thermal expansion coefficient of silicon carbide optical lens 4 is only 6ppm / ℃, reducing the displacement of parts caused by temperature fluctuations. It is suitable for industrial-grade working conditions of -10℃ to 50℃. The hollow structure reduces weight while ensuring strength, laying the foundation for the lightweight AR device. At the same time, it provides a stable mounting base for components such as microchannel liquid cooling tube 1, slider slot 3, positioning boss 6, and optical window 8.

[0046] Slider slot 3: As a precise mounting carrier for the elastic slider 7, it is located at the four corners of the titanium alloy mounting frame 2. Each slot is a rectangular groove structure with a length of 3mm, a width of 2mm, and a depth of 0.5mm. The inner wall of the slot has a tenon 14 at the corresponding position. It provides a fixed installation space for the elastic slider 7 through cooperation, so as to realize the edge pressing and fixing of the diffraction grating layer 5. At the same time, the tenon 14 and the tenon 15 of the elastic slider 7 form a mechanical self-locking to prevent the slider from loosening. The rectangular groove structure can ensure the positional accuracy of the elastic slider 7 after installation, avoid the displacement of parts caused by the irregular shape of the slot, and ensure the coaxiality of the optical components.

[0047] Silicon carbide optical lens 4: As the core optical imaging component, it is fixedly attached to the side of the diffraction grating layer 5 away from the optical window 8. It is made of 4H-SiC single crystal substrate and measures 25mm × 30mm × 0.8mm (length × width × thickness). The four corners are rounded with R1mm. It achieves "dual function of one lens" by integrating an "aspherical microlens array + tilted grating structure" on the substrate surface. The microlens array (the radius of curvature of a single microlens is 8mm ± 0.1mm) calibrates the diverging beam into parallel light, and the tilted grating (period 300nm ± 10nm, tilt angle 25° ± 0.5°) participates in optical path adjustment. Compared with the traditional separate "lens + grating" structure, the thickness is reduced. With a light transmittance of 55.6%, it meets the ultra-thin requirement of <1.5mm. It utilizes the high refractive index (2.6-2.7) of silicon carbide to reduce beam loss and combines it with a low coefficient of thermal expansion (2.6ppm / ℃) to improve temperature stability. It solves the contradiction between the "heavy" nature of traditional glass lenses and the "low light transmittance" of plastic lenses, directly matching the requirement of ≥90% light transmittance. The rectangular substrate and rounded corner design are compatible with the 8-inch wafer "whole plate processing-batch cutting" process (a single wafer can be cut into ≥100 pieces, and the utilization rate is 40% higher than that of traditional circular lenses). It also matches the worktable size of Wanzai Nanji Light's existing EVG520HE nanoimprint equipment, without the need for additional equipment modification, and is suitable for large-scale mass production.

[0048] Diffraction grating layer 5: As the core component for beam pupil expansion and dispersion compensation, it is fixedly attached to the support step of the optical window 8. Made of quartz glass, it has a thickness of 0.3mm ± 2μm and its overall size is slightly larger than the silicon carbide optical lens 4 (1mm larger on each side). Through the integration of a "subwavelength moth-eye structure" (200nm period, honeycomb arrangement) on its outer surface, it achieves broadband antireflection in the 400-750nm wavelength range (reflectivity <0.5%), reducing reflection loss by more than 50% compared to traditional antireflection coating solutions, directly improving... To increase light transmittance, the inner surface is etched with a "complementary grating structure" to form a "concave-convex matching" with the tilted grating of the silicon carbide optical lens 4. After bonding, the grating period deviation is ≤±2μm, which solves the problem of light path offset caused by traditional "planar bonding". At the same time, the high Abbe number (67) characteristics of quartz glass are used to form a dispersion compensation system with the silicon carbide lens, reducing the intensity of the rainbow effect from 20% to below 5%. Together with the silicon carbide optical lens 4, two-dimensional pupil expansion (large field of view) is achieved, ensuring the clarity and color uniformity of AR imaging.

[0049] Positioning boss 6: As a docking and positioning component between the module and the AR glasses frame, it is integrally formed on the left and right side walls of the titanium alloy mounting frame 2. Each boss is a cylindrical structure with a diameter of 2mm and a height of 0.3mm, with a tolerance grade of H7. It completes the overall coarse positioning of the module by cooperating with the positioning holes of the frame, ensuring that the coaxiality of the module is ≤±10μm, ensuring the alignment of the central axis of the optical components with the center of the user's field of vision. At the same time, the 0.3mm height design can avoid wear caused by direct contact between the titanium alloy mounting frame 2 and the frame, extending the service life of the structure. The cylindrical structure and H7 tolerance grade can improve docking accuracy, reduce imaging offset caused by positioning deviation, and adapt to the installation requirements of AR glasses frames of different specifications.

[0050] Elastic slider 7: As a mechanical fixing component of the optical assembly, it is movably connected in the slider slot 3. It is made of beryllium copper and has dimensions of 3mm × 1.8mm × 0.5mm (length × width × thickness). The surface is plated with a 5μm thick nickel layer. One end has an integrally formed tenon 15 (height 0.2mm), which fits with the tenon 14 of the titanium alloy mounting frame 2 with a gap of ≤0.05mm. The tenon 15 and the tenon 14 form a mechanical self-locking mechanism, which can be fixed without additional bolts. The other end has a pressing surface designed with R1. The 5mm arc structure fits tightly against the edge of the diffraction grating layer 5 (the area without the grating), providing a uniform preload of 0.5N±0.1N. This prevents optical components from loosening and avoids sharp edges from scratching the grating layer (traditional sliders have a scratch rate of 5%, while this design has a rate of 0%). The high elastic modulus (130GPa) of beryllium copper ensures that the slider can maintain the preload after repeated assembly, while the nickel plating layer improves wear resistance (life ≥10,000 times) and EMC shielding function, solving the defect of traditional sliders that are "only fixed but not shielded".

[0051] Optical window 8: Serving as an optical beam transmission channel and a support component for the diffraction grating layer, it is fixedly connected to the rear side of the titanium alloy mounting frame 2 away from the user's field of view. It is a rectangular hollow area (with support steps at the edges) that matches the size of the diffraction grating layer 5. The support steps provide a stable support reference surface for the diffraction grating layer 5, ensuring that the central axis of the optical component is consistent with the reference axis of the frame. The rectangular hollow structure serves as a transmission channel for the optical beam, ensuring that the beam of the MicroOLED optical engine can be incident on the silicon carbide optical lens 4 without obstruction, while avoiding interference from the frame structure to the imaging optical path. The design of the support steps can limit the installation position of the diffraction grating layer 5, preventing it from shifting during assembly or use, and ensuring the stability of the optical system.

[0052] Dispensing and curing area 9: As an auxiliary fixing and sealing component for optical components, it is made of 3MDP460 epoxy resin adhesive and is distributed in 24 dots at the contact edge between the support step of the optical window 8 and the diffraction grating layer 5 (the diameter of a single adhesive dot is 0.5 mm and the spacing is 1 mm). After curing, the hardness is Shore D85 and the shrinkage rate is <1%. It forms a double fixing of "clamping + bonding" by cooperating with the elastic slider 7, covering the gap area not covered by the slider, further improving the connection stability between the diffraction grating layer 5 and the optical window 8, avoiding the loosening of parts caused by vibration or temperature difference. It forms a closed-loop adhesive layer at the edge of the optical window 8, and works in conjunction with JSR·AR-NIL UV adhesive 10 to seal and prevent dust and moisture from entering the optical area, and help ensure the IP54 protection level. The low shrinkage rate can avoid the distortion of the surface shape of the parts caused by the shrinkage of traditional adhesives, and ensure optical accuracy.

[0053] JSR·AR-NIL UV Adhesive 10: As a bonding medium between silicon carbide optical lenses and diffraction grating layers, it is sandwiched between diffraction grating layer 5 and silicon carbide optical lenses 4. It has a thickness of 10μm±1μm and a refractive index of 1.9. Through precise refractive index design, it matches the refractive index difference between silicon carbide (2.6-2.7) and quartz glass (1.458), avoiding interface reflection loss (traditional adhesive layer reflection loss is 2%-3%). It achieves a tight three-layer bonding of "silicon carbide lens grating - UV adhesive - diffraction grating layer grating", ensuring the continuity of optical path transmission. It forms a closed-loop seal in the "grating-free transition area", and works with fluororubber sealing ring 11 to form a "double seal", improving the reliability of IP54 protection level. The uniform thickness control of 10μm±1μm can ensure the surface accuracy of optical components after bonding, avoid imaging distortion caused by uneven adhesive layer, and adapt to the bonding requirements of nanoscale optical structures.

[0054] Fluororubber sealing ring 11: As a protective sealing component of the module, it is embedded in the groove inside the titanium alloy mounting frame 2 and surrounds the outer periphery of the diffraction grating layer 5. It is made of FKM fluororubber and has a cross-sectional dimension of 0.5mm × 0.5mm (width × height). A sealing lip with a 30° angle is provided on the edge facing the diffraction grating layer 5. The lip fits tightly with the edge side of the diffraction grating layer 5 (compression amount 20% ± 5%) to form an elastic seal, blocking external dust and moisture from entering the optical area. It meets the IP54 protection level (no leakage after 30 minutes of water spray). Utilizing the heat insulation properties of fluororubber, it isolates the temperature conduction interference between the titanium alloy mounting frame 2 and the optical components, ensuring the temperature stability of the optical components and avoiding stress deformation caused by temperature difference. The temperature resistance range of -20℃ to 200℃ can meet the complex working conditions of industrial grade. It has no aging failure after long-term use and is suitable for the use requirements of AR equipment in different environments.

[0055] Graphene heat dissipation film 12: As a heat conduction component of the optical assembly, it is sandwiched between the titanium alloy mounting frame 2 and the diffraction grating layer 5. It is made of 50 layers of flexible graphene film, with a thickness of 0.05 mm and a bending radius of 5 mm. One side is coated with 10 μm thick nano-silver thermal conductive paste. Through the high thermal conductivity of graphene (300 W / m·K) and the design of ≥95% adhesion (no air bubbles), the heat generated by the silicon carbide optical lens 4 and the diffraction grating layer 5 is laterally diffused to the titanium alloy mounting frame 2. The contact thermal resistance is ≤0.05℃·cm. 2 / W, which is 75% lower than traditional copper foil heat sinks. The flexible structure and non-optical area coverage design (covering only the frame wall thickness area) not only adapt to the fit of the frame and optical components, but also avoids blocking the imaging optical path. The 10μm thick nano silver thermal paste further reduces the contact thermal resistance between the film and the components, ensuring a continuous and efficient heat dissipation path, assisting the microchannel liquid cooling pipe 1 to achieve rapid heat dissipation, and ensuring the temperature stability of the module during long-term operation.

[0056] Parallel Flow Channel 13: As the core heat dissipation channel of the microchannel liquid cooling pipe 1, it is opened inside the microchannel liquid cooling pipe 1. There are 3 channels in total, which are distributed parallel to the length of the liquid cooling pipe. Each channel has a diameter of 0.5mm. The multi-channel design increases the contact area between the cooling medium and the inner wall of the liquid cooling pipe, improves the heat exchange efficiency, and makes the heat dissipation efficiency of the microchannel liquid cooling pipe 1 49% higher than that of the traditional circular liquid cooling pipe. It can quickly remove the 0.8W of heat generated by the MicroOLED optical engine. The 0.5mm diameter design ensures the flow rate while avoiding the increase of the liquid cooling pipe thickness due to the excessively thick channel. It is suitable for the ultra-thin module requirements. The parallel distribution structure can ensure that the cooling medium flows evenly in the pipe, avoids excessive local temperature, ensures the uniformity of heat dissipation, and assists the microchannel liquid cooling pipe 1 in achieving efficient temperature control of the module.

[0057] The tenon 14 serves as a self-locking mechanism for the elastic slider 7. It is located on the inner wall of the slider slot 3 of the titanium alloy mounting frame 2 and has a barbed design that complements the tenon 15 of the elastic slider 7. The tenon 14 engages with the tenon 15 to form a mechanical self-lock, preventing the elastic slider 7 from coming off under vibration, temperature difference, or external force. No additional fasteners (such as screws) are needed, simplifying the assembly process and improving production efficiency. The barbed structure enhances the self-locking stability and maintains a reliable fixing effect even under long-term use or frequent vibration conditions. It meets the installation requirements of the elastic slider 7 and ensures the mechanical fixing reliability of the optical components.

[0058] Tenon 15: As a self-locking connection structure for the elastic slider 7, it is integrally formed on the side of the elastic slider 7 facing the titanium alloy mounting frame 2, with a height of 0.2mm and a fit clearance of ≤0.05mm with the tenon 14. Through the barbed complementary engagement with the tenon 14, the elastic slider 7 is fixed in the slider slot 3, forming a mechanical self-lock. Stable fixation can be achieved without additional bolts. The 0.2mm height design ensures the engagement depth and avoids self-locking failure due to the tenon being too short. The fit clearance of ≤0.05mm can improve the connection accuracy, reduce the installation offset of the elastic slider 7, ensure uniform pressing of the diffraction grating layer 5, and meet the precise positioning requirements of mechanical fixing components.

[0059] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A micro optical lens mounting structure for AR display comprising a titanium alloy mounting frame (2), characterized in that: The upper and lower sides of the titanium alloy mounting frame (2) are respectively fixedly connected with micro-channel liquid cooling pipes (1), the inside of the micro-channel liquid cooling pipes (1) is provided with three parallel flow channels (13) along the length direction, and the four corners of the titanium alloy mounting frame (2) are respectively provided with sliding block clamping grooves (3); The left and right side walls of the titanium alloy mounting frame (2) are respectively fixedly connected with positioning bosses (6), and the side of the titanium alloy mounting frame (2) away from the user's visual field is fixedly connected with an optical window (8); The side of the optical window (8) away from the titanium alloy mounting frame (2) is fixedly attached with a diffraction grating layer (5), and a point gluing curing area (9) is arranged between the contact edges of the optical window (8) and the diffraction grating layer (5); The point gluing curing area (9) is fixedly connected with the optical window (8) and the diffraction grating layer (5), and the side of the diffraction grating layer (5) away from the optical window (8) is fixedly attached with a silicon carbide optical lens (4).

2. The micro optical lens mounting structure for AR display according to claim 1, characterized by: JSR·AR-NIL ultraviolet glue (10) is arranged between the diffraction grating layer (5) and the silicon carbide optical lens (4), and the JSR·AR-NIL ultraviolet glue (10) is fixedly bonded with the diffraction grating layer (5) and the silicon carbide optical lens (4).

3. The micro optical lens mounting structure for AR display according to claim 2, characterized by: A fluororubber sealing ring (11) is arranged on the outer circumferential side of the diffraction grating layer (5), one side of the fluororubber sealing ring (11) is fixedly connected with the titanium alloy mounting frame (2), and the other side of the fluororubber sealing ring (11) is tightly attached to the edge of the diffraction grating layer (5).

4. The micro optical lens mounting structure for AR display according to claim 3, characterized in that: Graphene heat dissipation film (12) is further arranged between the titanium alloy mounting frame (2) and the diffraction grating layer (5), and the graphene heat dissipation film (12) is fixedly attached to the titanium alloy mounting frame (2) and the diffraction grating layer (5).

5. The micro optical lens mounting structure for AR display according to claim 4, characterized in that: Elastic sliding blocks (7) are movably connected in the sliding block clamping grooves (3), the side of the elastic sliding blocks (7) facing the titanium alloy mounting frame (2) is fixedly connected with tenons (15), and the titanium alloy mounting frame (2) is provided with mortises (14) corresponding to the tenons (15).

6. The micro optical lens mounting structure for AR display according to claim 5, characterized in that: The tenons (15) and the mortises (14) are matched with each other, and the side of the elastic sliding blocks (7) away from the tenons (15) is fixedly pressed against the edge of the diffraction grating layer (5).

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