A pvg spectacle lens processing device

Abstract

The application relates to the technical field of spectacle lens manufacturing, and particularly relates to a PVG spectacle lens processing device, which comprises an ultraviolet picosecond laser film removing module, a green picosecond laser cutting module, a carbon dioxide laser splitting module, a vacuum laminating unit and an electrically-controlled displacement platform. The ultraviolet picosecond laser film removing module, the green picosecond laser cutting module and the carbon dioxide laser splitting module are connected through a shared light path and arranged in sequence on the light path. The vacuum laminating unit is arranged between the ultraviolet picosecond laser film removing module and the green picosecond laser cutting module. The electrically-controlled displacement platform is used for carrying a lens and sequentially conveying the lens to the working areas of the modules in a preset order. The application has the effects of synergistic optimization of a composite laser process of ultraviolet picosecond laser film removing, green picosecond laser cutting and carbon dioxide laser splitting, consideration of precision and efficiency, improvement of the overall processing speed to 5 times, and sharing of the same light path by the ultraviolet and green picosecond lasers, wavelength switching through a beam splitter, and reduction of the equipment volume and cost.

Description

Technical Field

[0001] This application relates to the technical field of spectacle lens manufacturing, and in particular to a PVG spectacle lens processing apparatus. Background Technology

[0002] In the field of optical displays, with the rapid development of augmented reality (AR) technology, the demand for efficient molding and surface treatment of AR waveguide lenses is increasing. Holographic waveguide technology, with its advantages in process efficiency, cost, and color uniformity, has attracted great attention from AR optical module manufacturers. Polarizing volume holographic gratings (PVGs), as a new type of holographic grating, have shown great application potential in the field of near-eye display waveguides. Their excellent large-angle Bragg diffraction characteristics and good polarization response characteristics provide a wider field of view for waveguide display systems and bring new design dimensions to the field of optical displays.

[0003] In the manufacturing of PVG eyeglass lenses, traditional methods typically involve both manual and mechanical cutting. Manual cutting relies on experience and simple tools, with the entire process depending on the worker's skill and meticulousness. Mechanical cutting utilizes conventional cutting equipment to cut the lenses according to a pre-set program. While these methods meet the basic requirements of lens manufacturing to some extent, they have gradually revealed numerous limitations under the demands of large-scale production and high precision.

[0004] However, traditional PVG waveguide lens manufacturing relies on manual and mechanical cutting methods, which have significant drawbacks. Manual operation and mechanical cutting struggle to guarantee high precision, easily leading to edge chipping, which severely impacts waveguide coupling efficiency. Furthermore, this method suffers from severe thermal damage, and the complex manual process results in low yield and low production volume, failing to meet current market demands for high-precision, high-efficiency PVG eyeglass lenses. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this application is to provide a PVG eyeglass lens processing device. The technical solution adopted is as follows: It includes an ultraviolet picosecond laser film removal module, a green picosecond laser cutting module, a carbon dioxide laser dicing module, a vacuum bonding unit, and an electrically controlled displacement platform; The ultraviolet picosecond laser film removal module, the green picosecond laser cutting module, and the carbon dioxide laser dicing module are connected through the same optical path and arranged sequentially on the optical path. The vacuum bonding unit is disposed between the ultraviolet picosecond laser film removal module and the green light picosecond laser cutting module; The electrically controlled displacement platform is used to hold the lenses and transport them sequentially to the working areas of each module according to a preset order.

[0006] By adopting the above technical solution, integrating the ultraviolet picosecond laser coating removal module, the green light picosecond laser cutting module, the carbon dioxide laser dicing module, the vacuum bonding unit, and the electrically controlled displacement platform, a fully automated process for lens manufacturing has been realized, effectively improving production efficiency and precision. The collaborative work of each module reduces manual intervention and lowers the risk of errors. At the same time, the electrically controlled displacement platform ensures precise positioning and transportation of the lens during processing, improving the consistency and reliability of the overall manufacturing process.

[0007] Optionally, the common optical path is equipped with a beam splitter, which selectively guides either ultraviolet picosecond laser or green picosecond laser to the processing station by switching the angle of the reflecting surface.

[0008] By adopting the above technical solution, selective conduction of ultraviolet picosecond laser and green picosecond laser is achieved, reducing the number of optical components and space occupation, and lowering equipment costs; the flexible switching of the reflective surface angle of the beam splitter makes laser switching fast and accurate, improving processing flexibility and efficiency, while avoiding the trouble of adjusting the optical path multiple times.

[0009] Optionally, the green picosecond laser cutting module is equipped with a circular trajectory driving component, which includes a servo motor and a guide rail mechanism, for driving the laser focus point to perform a spiral progressive circular cutting motion along the edge of the lens.

[0010] By adopting the above technical solution, the circular trajectory drive component drives the laser focus point to perform a spiral progressive circular cutting motion along the edge of the lens through a servo motor and guide rail mechanism. This motion mode ensures the smoothness and continuity of the cutting process, reduces the risk of edge chipping and cracking, improves the cutting quality and the accuracy of the lens contour, and is also suitable for processing lenses with complex shapes.

[0011] Optionally, the circular trajectory driving component is linked to a focus tracking sensor, which is a laser displacement sensor used to provide real-time feedback of lens surface topography data to dynamically adjust the laser focus position.

[0012] By adopting the above technical solution, the introduction of the focus tracking sensor (laser displacement sensor) can monitor the surface morphology of the lens in real time and dynamically adjust the laser focus position, effectively compensating for unevenness or deformation of the lens surface, ensuring the stability and accuracy of laser cutting, reducing processing defects caused by focus offset, and improving the product qualification rate.

[0013] Optionally, the carbon dioxide laser dicing module integrates a preheating irradiation component, which is used to apply uniform thermal radiation to a local area of ​​the lens along a preset direction of the lens dicing path.

[0014] By adopting the above technical solution, the preheating irradiation component applies uniform thermal radiation to the local area of ​​the lens before carbon dioxide laser cleaving. The preheating treatment reduces the internal stress of the lens, makes the cleaving process more controllable, reduces the uncertainty of crack propagation, improves the quality of cleaving and edge integrity, and at the same time reduces the risk of lens breakage.

[0015] Optionally, the carbon dioxide laser cleaving module is provided with a crack guide groove, which is made of wear-resistant ceramic material and embedded in a preset direction aligned with the lens cleaving path.

[0016] By adopting the above technical solution, the crack guide groove is made of wear-resistant ceramic material and aligned with the crack path, which can effectively guide the crack to expand along the preset direction, prevent the crack from deviating, and improve the accuracy and consistency of the crack. The wear resistance of the ceramic material ensures the long-term stability of the guide groove, reduces maintenance requirements, and extends the service life of the equipment.

[0017] Optionally, the vacuum bonding unit includes an adsorption fixing stage and a vacuum chamber. The adsorption fixing stage is provided with positioning pins, and the vacuum chamber controls the range of vacuum level through a pressure regulating valve.

[0018] By adopting the above technical solution, the vacuum bonding unit, through the adsorption fixing stage and vacuum chamber design, combined with positioning pins and pressure regulating valves, ensures the firm fixation and precise positioning of the lens during the bonding process. The controllable range of vacuum degree allows for adaptation to different materials and bonding requirements, improving bonding quality and bonding strength, and reducing problems such as bubbles and displacement.

[0019] Optionally, the electrically controlled displacement platform includes a three-dimensional coordinate movement mechanism and a rotating clamping arm. The rotating clamping arm is adapted to lenses of different sizes through a snap-on quick-release structure, which includes adjustable grippers and a spring loading mechanism.

[0020] By adopting the above technical solution, rapid clamping and precise positioning of lenses are achieved. The adjustable grippers and spring loading mechanism are adapted to lenses of different sizes, improving the versatility and operational efficiency of the equipment, reducing the time for changing fixtures, and making it suitable for multi-variety, small-batch production.

[0021] Optionally, the device integrates a process parameter matching system, which includes a storage unit and a matching calculation unit. The storage unit pre-stores standard process parameter sets corresponding to different material properties, and the matching calculation unit automatically adjusts the process parameters of each module according to the lens material properties.

[0022] By adopting the above technical solution, the process parameter matching system automatically adjusts the process parameters of each module through the storage unit and the matching calculation unit, optimizes the processing conditions according to the lens material properties, reduces errors and debugging time in manual parameter setting, improves production consistency and efficiency, and ensures stable processing quality of lenses made of different materials.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. The integrated ultraviolet picosecond laser coating removal module, green light picosecond laser cutting module, carbon dioxide laser dicing module, vacuum bonding unit and electrically controlled displacement platform realize the fully automated process of lens manufacturing, effectively improving production efficiency and precision; the collaborative work of each module reduces manual intervention and reduces error risk, while the electrically controlled displacement platform ensures precise positioning and transportation of lenses during processing, improving the consistency and reliability of overall manufacturing; 2. By using a shared optical path and beam splitter technology, flexible switching of the laser source is achieved, improving processing flexibility. More importantly, it introduces several innovative technologies such as spiral progressive circumferential cutting, real-time focus tracking, preheating, and crack guidance. These technologies work synergistically to precisely control the interaction between the laser and the material, effectively solving core problems in lens cutting such as edge chipping, crack control, and focus drift, thereby significantly improving the processing quality, contour accuracy, and yield of lens edges. 3. The quick-change clamping mechanism of the electrically controlled displacement platform can quickly adapt to lenses of different sizes, enhancing the equipment's versatility. Simultaneously, the integrated process parameter matching system can automatically select the optimal processing parameters based on the lens material properties, simplifying the operation process, reducing reliance on operator skills, and ensuring the stability of processing quality for lenses made of different materials. This makes it ideal for flexible production needs involving multiple varieties and small batches. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall manufacturing equipment; Figure 2 This is a schematic diagram of UV picosecond laser membrane removal; Figure 3 This is a schematic diagram of vacuum lamination; Figure 4 This is a schematic diagram of green picosecond laser cutting and carbon dioxide fragmentation; In the picture, 1. Ultraviolet picosecond laser film removal module; 2. Green light picosecond laser cutting module; 3. Carbon dioxide laser dicing module; 4. Vacuum bonding unit; 5. Electrically controlled displacement platform; Detailed Implementation The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail below.

[0025] A PVG eyeglass lens processing device, as described above Figure 1 The system includes an ultraviolet picosecond laser decoction module 1, a green picosecond laser cutting module 2, a carbon dioxide laser dicing module 3, a vacuum bonding unit 4, and an electrically controlled displacement platform 5. The ultraviolet picosecond laser decoction module 1, the green picosecond laser cutting module 2, and the carbon dioxide laser dicing module 3 are connected via the same optical path. The vacuum bonding unit 4 is positioned between the ultraviolet picosecond laser decoction module 1 and the green picosecond laser cutting module 2. The electrically controlled displacement platform 5 holds the lenses and sequentially transports them to the working areas of each module according to a preset order. This achieves automated, high-precision lens manufacturing, improving overall processing speed and yield. This is because the modules have clear division of labor and work together in an orderly manner, avoiding the defects of manual and mechanical cutting. The shared optical path for ultraviolet and green picosecond lasers also reduces equipment size and cost.

[0026] Specifically, the ultraviolet picosecond laser coating removal module 1 includes a laser generator and a beam transmission assembly. The laser generator produces ultraviolet picosecond laser light, characterized by high energy density and short pulses, enabling non-thermal ablation coating removal and reducing thermal damage to the lens. Replaceable laser generators can be from different brands but with similar performance. The beam transmission assembly transmits the laser light generated by the laser generator to the processing station and typically consists of a mirror and a lens. Its materials are generally selected from optical materials with high reflectivity and high transmittance. For example, the mirror can be a glass lens coated with a high-reflectivity film, and the lens can be made of optical quartz glass. The various components of the beam transmission assembly are connected and fixed by a precision mechanical structure to ensure the stability and accuracy of laser transmission. (Refer to...) Figure 2 The image on the left shows the lens before coating removal, and the image on the right shows the lens after coating removal.

[0027] Furthermore, the vacuum bonding unit 4 includes an adsorption and fixing stage and a vacuum chamber. The adsorption and fixing stage is equipped with positioning pins for accurately fixing the lens position. These positioning pins are generally made of hard metal, such as stainless steel, and their surface is finely machined to ensure positioning accuracy. The vacuum chamber controls the vacuum level range through a pressure regulating valve. The pressure regulating valve can be an electric or pneumatic regulating valve, allowing for precise adjustment of the vacuum level according to actual needs. The vacuum chamber is made of a material with good sealing performance, such as stainless steel or glass, to ensure a stable vacuum environment during the bonding process. (Refer to...) Figure 3 The lenses after the coating is removed are combined to form an overlay. The upper right image in the diagram shows the oblique view of the combined lenses to show the overlapping state. The lenses are completely overlapped top to bottom with aligned edges.

[0028] Furthermore, the green picosecond laser cutting module 2 includes a laser emitting device and a circular trajectory drive assembly. The laser emitting device generates a green picosecond laser, characterized by excellent focusing performance and cold cutting capability, keeping the heat-affected zone within a small area. Replaceable laser emitting devices can be other models with similar performance. The circular trajectory drive assembly includes a servo motor and a guide rail mechanism. The servo motor provides power and features high-precision speed control and torque output capability; it can be an AC or DC servo motor. The guide rail mechanism guides the movement trajectory of the laser focal point and typically consists of a linear guide rail and a slider, made of high-strength metal materials such as aluminum alloy. The servo motor is connected to the transmission components of the guide rail mechanism via a coupling, driving the laser focal point to perform a helical, progressive circular cutting motion along the edge of the lens. (See reference...) Figure 4 The combined lenses are then cut to form the image on the right. The left side of the image shows the oblique view of the combined lenses, which is convenient to show that they are in an overlapping state. The lenses are completely overlapped top to bottom and the edges are aligned.

[0029] Furthermore, the carbon dioxide laser dicing module 3 includes a laser emitting unit and a preheating irradiation assembly. The laser emitting unit generates a carbon dioxide laser for the dicing operation. Its structural feature is the ability to generate significant thermal stress, causing the lens to dice along a predetermined direction. A replaceable laser emitting unit can be other products with similar power and performance. The preheating irradiation assembly is used to apply uniform thermal radiation to a localized area of ​​the lens along the predetermined dicing path. It typically consists of a heating wire and a reflector. The heating wire is made of a high-temperature resistant, high-resistance material, such as a nickel-chromium alloy wire. The reflector can be made of a high-reflectivity metal material, such as stainless steel, to reflect the heat generated by the heating wire onto the lens, ensuring uniform heat distribution.

[0030] Furthermore, after the electronically controlled displacement platform 5 loads the lens to be processed, it sequentially performs ultraviolet laser coating removal, vacuum bonding, cutting, and cleaving to complete the processing and then unload the lens. The electronically controlled displacement platform 5 includes a three-dimensional coordinate movement mechanism and a rotary clamping arm. The three-dimensional coordinate movement mechanism is used to achieve precise movement of the lens in three directions. It typically consists of a lead screw and nut pair, a linear guide rail, and a drive motor. The lead screw and nut pair converts rotational motion into linear motion, the linear guide rail ensures the straightness and stability of the movement, and the drive motor provides power; a stepper motor or servo motor can be selected. The rotary clamping arm adapts to lenses of different sizes through a snap-on quick-release structure. The snap-on quick-release structure includes adjustable jaws and a spring loading mechanism. The adjustable jaws are generally made of elastic metal materials, such as spring steel, and provide clamping force through the spring loading mechanism, automatically adjusting the jaw opening according to the lens size.

[0031] The implementation principle of this application embodiment is as follows: the device achieves automated and high-precision manufacturing of PVG eyeglass lenses through the coordinated work of various modules. The ultraviolet picosecond laser coating removal module 1 uses non-thermal ablation technology to remove the coating layer on the lens surface, reducing thermal damage; the green picosecond laser cutting module 2 adopts a spiral circumferential cutting path and adaptive focus tracking to control the heat-affected zone; the carbon dioxide laser cleaving module 3 ensures that the crack extends along a preset direction through preheating and crack guide grooves; the vacuum bonding unit 4 ensures the accuracy and quality of lens bonding; and the electrically controlled displacement platform 5 realizes the precise delivery and positioning of the lens.

[0032] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A PVG eyeglass lens processing device, characterized in that, It includes an ultraviolet picosecond laser film removal module (1), a green picosecond laser cutting module (2), a carbon dioxide laser dicing module (3), a vacuum bonding unit (4), and an electrically controlled displacement platform (5). The ultraviolet picosecond laser film removal module (1), the green light picosecond laser cutting module (2), and the carbon dioxide laser dicing module (3) are connected through the same optical path and arranged sequentially on the optical path; The vacuum bonding unit (4) is disposed between the ultraviolet picosecond laser film removal module (1) and the green light picosecond laser cutting module (2); The electronically controlled displacement platform (5) is used to carry the lenses and transport them to the working areas of each module in a preset order.

2. The PVG eyeglass lens processing device according to claim 1, characterized in that, The shared optical path is equipped with a beam splitter, which selectively guides either ultraviolet picosecond laser or green picosecond laser to the processing station by switching the angle of the reflecting surface.

3. The PVG eyeglass lens processing device according to claim 2, characterized in that, The green picosecond laser cutting module (2) is equipped with a ring trajectory driving component, which includes a servo motor and a guide rail mechanism, used to drive the laser focus point to perform a spiral progressive ring cutting motion along the edge of the lens.

4. The PVG eyeglass lens processing device according to claim 3, characterized in that, The circular trajectory drive component is linked to a focus tracking sensor, which is a laser displacement sensor used to provide real-time feedback of lens surface topography data in order to dynamically adjust the laser focus position.

5. The PVG eyeglass lens processing device according to claim 1, characterized in that, The carbon dioxide laser cleaving module (3) integrates a preheating irradiation component, which is used to apply uniform thermal radiation to a local area of ​​the lens along a preset direction of the lens cleaving path.

6. The PVG eyeglass lens processing device according to claim 5, characterized in that, The carbon dioxide laser cleaving module (3) is provided with a crack guide groove, which is made of wear-resistant ceramic material and is embedded in alignment with the preset direction of the lens cleaving path.

7. The PVG eyeglass lens processing device according to claim 1, characterized in that, The vacuum bonding unit (4) includes an adsorption fixing stage and a vacuum chamber. The adsorption fixing stage is provided with positioning pins, and the vacuum chamber controls the range of vacuum through a pressure regulating valve.

8. The PVG eyeglass lens processing device according to claim 1, characterized in that, The electrically controlled displacement platform (5) includes a three-dimensional coordinate moving mechanism and a rotating clamping arm. The rotating clamping arm is adapted to different sizes of lenses through a snap-on quick-release structure. The snap-on quick-release structure includes adjustable grippers and a spring loading mechanism.

9. The PVG eyeglass lens processing device according to claim 1, characterized in that, The device integrates a process parameter matching system, which includes a storage unit and a matching calculation unit. The storage unit pre-stores standard process parameter sets corresponding to different material properties, and the matching calculation unit automatically adjusts the process parameters of each module according to the lens material properties.

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