LED combined lens and preparation process thereof

Abstract

The invention provides an LED combined lens and a preparation process thereof. A plurality of elliptical lenses are integrally formed on a lens main body; the raw materials of the elliptical lens comprise polymethyl methacrylate, zinc oxide, selenium bismuthide and silver; wherein the raw materials comprise the following components in percentage by mass: 57%-70% of polymethyl methacrylate; 10%-20% of zinc oxide; 5%-15% of selenium bismuthide; 2%-8% of silver; according to the combined lens, through special material combination and structural design, the light refraction effect is remarkably improved, compared with a traditional single-material lens, the propagation direction and distribution of light can be more effectively controlled, the light utilization efficiency is greatly improved, emergent light is more uniform and concentrated, and the illumination brightness and definition are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of optical lenses, and in particular to an LED combined lens and a preparation process thereof. Background Art

[0002] Traditional LED lenses are mostly made of a single material, which has many limitations when dealing with complex lighting needs. For example, common plastic lenses have the advantages of low cost, light weight, and easy processing, but they often have problems such as low refractive index, poor heat resistance, and insufficient optical stability, resulting in low light utilization efficiency. They are also prone to deformation and aging after long-term use or in high-temperature environments, affecting lighting effects and service life.

[0003] Although glass lenses have a higher refractive index, better heat resistance and optical stability, they are brittle, difficult to process and expensive, which limits their large-scale application and promotion. In addition, whether it is a plastic lens or a glass lens, it is difficult for traditional single-material lenses to have good light refraction and thermoelectric properties at the same time, and it is difficult to meet the needs of modern optoelectronic devices for multifunctional integration. For example, in some lighting systems that need to use the thermoelectric effect to achieve self-regulating heat dissipation or energy recovery, traditional lenses cannot play an effective role. Summary of the invention

[0004] The present invention provides an LED combined lens and a preparation process thereof, which are used to solve the defect that a single-material LED lens in the prior art cannot simultaneously meet the requirements of high refractive index, good heat resistance, optical stability and thermoelectric performance.

[0005] In one aspect, the present invention provides an LED combination lens, comprising a lens body; A plurality of elliptical lenses are integrally formed on the lens body; The raw materials of the elliptical lens include polymethyl methacrylate, zinc oxide, bismuth selenium and silver; in: The raw materials are as follows by mass percentage: Polymethyl methacrylate: 57%-70%; Zinc oxide: 10%-20%; Bismuth selenium: 5%-15%; Silver: 2%-8%.

[0006] According to an LED combined lens provided by the present invention, a lamp bead mounting plate is mounted on the elliptical lens, and lamp beads are mounted on the lamp bead mounting plate.

[0007] According to an LED combined lens provided by the present invention, the lamp bead is any one of lamp bead 1 and lamp bead 2.

[0008] According to an LED combination lens provided by the present invention, the size of the lamp bead 1 is 5*5mm, and the size of the lamp bead 2 is 3*3mm.

[0009] According to an LED combined lens provided by the present invention, the lamp beads 2 on the lamp bead mounting plate are arranged in a W shape.

[0010] On the other hand, the present invention also provides a process for preparing a lens, comprising the following steps: S1, dissolving polymethyl methacrylate in toluene organic solvent to form a uniform solution A; S2, adding zinc oxide, bismuth selenium and silver to solution A, and uniformly dispersing the substances by ultrasonic wave to obtain solution B; S3, performing a grafting reaction on the solution B, the reaction temperature is 60-80° C., the reaction time is 4-6 hours, and azobisisobutyronitrile catalyst is added to form a chemical bond to obtain a solution C, thereby enhancing the interaction and achieving an ideal light refraction effect enhancement; S4, doping reaction: adding silver nitrate solution to the solution C, adjusting the distribution and content of silver in the material, and obtaining a mixed solution; S5, injecting the mixed solution into a mold, and curing and molding it to obtain a lens.

[0011] According to a lens preparation process provided by the present invention, the mass volume ratio of the toluene organic solvent is 30%-50%.

[0012] According to a process for preparing a lens provided by the present invention, the frequency of the ultrasonic wave is 20-50 kHz.

[0013] According to a process for preparing a lens provided by the present invention, the amount of azobisisobutyronitrile used is 0.5%-1.5% of the mass of polymethyl methacrylate.

[0014] According to a lens preparation process provided by the present invention, adding silver nitrate solution to the solution C comprises: Take analytically pure silver nitrate solid reagent, dissolve it in deionized water and dilute it to a concentration of 0.1-0.3 mol / L to form a silver nitrate solution; The silver nitrate solution is slowly added dropwise to the solution C after the grafting reaction, and the pH value of the reaction is adjusted to 8-10 by an alkaline regulator, and the reaction time is 2-3 hours.

[0015] The LED combined lens and its preparation process provided by the present invention have the following advantages: Excellent optical performance: The combined lens significantly improves the refraction effect of light through special material combination and structural design. Compared with traditional single-material lenses, it can more effectively control the propagation direction and distribution of light, greatly improve the utilization efficiency of light, make the light output more uniform and concentrated, and effectively improve the brightness and clarity of lighting.

[0016] Good heat resistance and stability: The material layer with excellent heat resistance effectively overcomes the problem of deformation and aging of traditional plastic lenses in high temperature environments, while maintaining the stability of optical properties. Even under long-term working or complex temperature change environments, it can still stably exert its optical function and ensure the consistency and reliability of lighting effects.

[0017] Integration of thermoelectric performance: The material layer with thermoelectric properties can generate an electric potential difference under the action of temperature gradient. On the one hand, it can realize self-regulating heat dissipation function, effectively reduce the heat accumulation generated by the lens due to long-term operation, and extend the service life; on the other hand, in some specific application scenarios, it can also partially convert heat energy into electrical energy, realize energy recovery and reuse, and improve the energy utilization efficiency of the entire lighting system.

[0018] Comprehensive advantages and application expansion: This LED combination lens combines multiple excellent properties. It can not only provide better lighting effects in the field of general lighting, but also show unique advantages in some special fields with high requirements on lens performance, such as automotive lighting, stage lighting, optical instruments, etc., which greatly expands the application scope and market potential of LED lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of a second installation method of an LED combination lens lamp bead provided by an embodiment of the present invention; Figure 2 This is the second structural schematic diagram of an LED combined lens provided by an embodiment of the present invention; Figure 3 This is one of the schematic diagrams of the second installation method of a lamp bead of an LED combination lens provided by an embodiment of the present invention; Figure 4 This is the second schematic diagram of the second installation method of an LED combination lens lamp bead provided by an embodiment of the present invention.

[0021] Figure 5 Schematic diagram of potential difference at different temperatures according to an embodiment of the present invention.

[0022] Reference numerals: 1. Lens body; 2. Elliptical lens; 3. Lamp bead mounting plate; 31. Lamp bead 1; 32. Lamp bead 2. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Combine the following Figure 1-Figure 4 The LED combination lens of the present invention includes a lens body 1; A plurality of elliptical lenses 2 are integrally formed on the lens body 1; The raw materials of the elliptical lens 2 include polymethyl methacrylate, zinc oxide, bismuth selenium and silver; in: The raw materials are as follows by mass percentage: Polymethyl methacrylate: 57%-70%; Zinc oxide: 10%-20%; Bismuth selenium: 5%-15%; Silver: 2%-8%.

[0025] Specifically, a lamp bead mounting plate 3 is mounted on the elliptical lens 2 , and lamp beads are mounted on the lamp bead mounting plate 3 .

[0026] Specifically, the lamp bead is any one of lamp bead 1 31 and lamp bead 2 32 .

[0027] like Figure 1 As shown, the size of the lamp bead 31 installed on the lamp bead mounting plate 3 is 5mm*5mm, and the light distribution (focusing) is a rectangular light spot. The light distribution meets the road lighting standards and has high light efficiency.

[0028] like Figure 3 As shown, the size of the lamp bead 2 32 installed on the lamp bead mounting plate 3 is 3mm*3mmmm, and the light distribution (focusing) is a rectangular light spot. The light distribution meets the road lighting standards and has high light efficiency.

[0029] like Figure 4 As shown, the lamp beads 32 on the lamp bead mounting plate 3 are arranged in a W shape, and the light distribution (focusing) is still a rectangular light spot, and the light distribution meets the road lighting standards.

[0030] By using lamp bead 1 31 or lamp bead 2 32, the following advantages are achieved: Improve the commonality of product materials; Improve product diversity; Reduce the number of product molds and improve product cost performance; Streamline inventory and shorten production cycle.

[0031] On the other hand, the present invention also provides a process for preparing a lens, comprising the following steps: 1. Prepare raw materials: Polymethyl methacrylate (PMMA): PMMA with good optical transparency and processability is selected as the base material of the lens to provide the optical performance foundation for the entire system.

[0032] Zinc oxide (ZnO): ZnO has unique photoelectric properties. It can play a positive role in the refraction and scattering of light, helping to improve the optical performance of lenses.

[0033] Bismuth selenide (Bi2Se3): Bi2Se3, which has special thermoelectric properties, is the key material that gives the lens thermoelectric properties.

[0034] Silver (Ag): Ag can improve electrical properties and light reflection effects, and plays an important role in optimizing the overall performance of lenses.

[0035] (II) Solution preparation Dissolve polymethyl methacrylate in toluene organic solvent, control the toluene concentration at 30%-50% (mass volume ratio) to form a uniform solution system.

[0036] 3. Material mixing and dispersion Zinc oxide, bismuth selenide and silver are added to the above solution in specific proportions, wherein zinc oxide accounts for 10%-20% of the total mass, bismuth selenide accounts for 5%-15%, and silver accounts for 2%-8%. The silver added in this step is one of the main materials and is evenly dispersed in the solution system together with other materials to prepare for subsequent reactions. For example, in the grafting reaction, silver can participate in the chemical bonding process and affect the overall structure and performance of the material. Ultrasonic dispersion technology is used to ensure that each substance is evenly dispersed in the solution under the conditions of an ultrasonic frequency of 20-50kHz and an ultrasonic time of 30-60 minutes.

[0037] (IV) Grafting reaction The grafting reaction system is heated to maintain the reaction temperature at 60-80°C, the reaction time is controlled at 4-6 hours, and azobisisobutyronitrile is added as a catalyst in an amount of 0.5%-1.5% of the mass of polymethyl methacrylate. Through the grafting reaction, chemical bonds are formed between the substances, and the interaction is enhanced, thereby effectively improving the light refraction effect of the lens.

[0038] (V) Doping reaction In the doping reaction stage, chemical precipitation method is used for silver doping. First, take analytically pure silver nitrate solid reagent, dissolve it with deionized water and dilute it to a concentration of 0.1-0.3 mol / L to form a silver nitrate solution. Then slowly add the silver nitrate solution dropwise to the system after the grafting reaction. The addition of silver nitrate solution in this step is mainly to further accurately control the distribution and content of silver in the material, to achieve the optimization of the thermoelectric properties of the material, etc. At the same time, the alkaline regulator is used to adjust the reaction pH value to 8-10, and the reaction time is controlled to 2-3 hours. In this process, the change of the position element is precisely controlled, so that the lens can achieve an effective improvement in thermoelectricity while maintaining insulation.

[0039] (VI) Molding process The mixed solution after the doping reaction is injected into a specific mold, the mold temperature is controlled at 40-60°C, and maintained at this temperature for 1-2 hours, and then cured and molded for 10-15 hours, and finally an LED lens with target performance is obtained.

[0040] Embodiment 1: First, prepare the raw materials. A certain amount of polymethyl methacrylate was dissolved in toluene to prepare a solution with a concentration of 30% (mass volume ratio). Then, these materials were added to the solution in a ratio of 10% zinc oxide to the total mass, 5% bismuth selenium, and 2% silver, and ultrasonic dispersion was performed under the conditions of an ultrasonic frequency of 20kHz and an ultrasonic time of 30 minutes. Next, a grafting reaction was carried out, the reaction system was heated to 60°C, reacted for 4 hours, and 0.5% azobisisobutyronitrile by mass of polymethyl methacrylate was added as a catalyst. After that, a silver doping reaction was carried out, a 0.1 mol / L silver nitrate solution was prepared and slowly added dropwise, the pH value was adjusted to 8, and the reaction was carried out for 2 hours. Finally, the mixed solution was injected into the mold, the mold temperature was maintained at 40°C for 1 hour, and then cured for 10 hours to obtain LED lens sample 1.

[0041] Embodiment 2: The above steps were repeated, except that when the solution was prepared, the toluene concentration was 40% (mass volume ratio); the material ratios were 15% zinc oxide, 10% bismuth selenium, and 5% silver; the ultrasonic dispersion parameters were an ultrasonic frequency of 35 kHz and an ultrasonic time of 45 minutes; the grafting reaction temperature was 70°C, the reaction time was 5 hours, and the catalyst dosage was 1% by mass of polymethyl methacrylate; the silver nitrate solution concentration in the silver doping reaction was 0.2 mol / L, the pH value was 9, and the reaction time was 2.5 hours; the mold temperature was maintained at 50°C for 1.5 hours and cured for 12.5 hours to obtain LED lens sample 2.

[0042] Embodiment 3: The steps were repeated again, with a toluene concentration of 43% (mass-volume ratio); material proportions of 20% zinc oxide, 15% bismuth selenium, and 8% silver; ultrasonic dispersion ultrasonic frequency of 50 kHz, ultrasonic time of 60 minutes; grafting reaction temperature of 80°C, reaction time of 6 hours, and catalyst dosage of 1.5% of the mass of polymethyl methacrylate; silver doping reaction with a silver nitrate solution concentration of 0.3 mol / L, a pH value of 10, and a reaction time of 3 hours; the mold temperature was maintained at 60°C for 2 hours and cured for 15 hours to obtain LED lens sample 3.

[0043] This combined lens has the following effects: Excellent optical performance: The combined lens significantly improves the refraction effect of light through special material combination and structural design. Compared with traditional single-material lenses, it can more effectively control the propagation direction and distribution of light, greatly improve the utilization efficiency of light, make the light output more uniform and concentrated, and effectively improve the brightness and clarity of lighting.

[0044] Good heat resistance and stability: The material layer with excellent heat resistance effectively overcomes the problem of deformation and aging of traditional plastic lenses in high temperature environments, while maintaining the stability of optical properties. Even under long-term working or complex temperature change environments, it can still stably exert its optical function and ensure the consistency and reliability of lighting effects.

[0045] Integration of thermoelectric performance: The material layer with thermoelectric properties can generate an electric potential difference under the action of temperature gradient. On the one hand, it can realize self-regulating heat dissipation function, effectively reduce the heat accumulation generated by the lens due to long-term operation, and extend the service life; on the other hand, in some specific application scenarios, it can also partially convert heat energy into electrical energy, realize energy recovery and reuse, and improve the energy utilization efficiency of the entire lighting system.

[0046] Comprehensive advantages and application expansion: This LED combination lens combines multiple excellent properties. It can not only provide better lighting effects in the field of general lighting, but also show unique advantages in some special fields with high requirements on lens performance, such as automotive lighting, stage lighting, optical instruments, etc., which greatly expands the application scope and market potential of LED lenses.

[0047] The present invention also provides some application scenarios in which the lens can be used. In the following scenarios, the LED combined lens partially converts thermal energy into electrical energy through thermoelectric properties, realizes energy recovery and reuse, and thus improves the specific manner of energy utilization efficiency of the lighting system: Indoor lighting scenes Powering small electronic devices: In indoor environments such as offices and homes, LED lamps will generate a certain amount of heat when working for a long time. The thermoelectric properties of the lens can be used to convert the generated heat energy into electrical energy. After being processed by circuits such as rectification and voltage stabilization, it can provide partial power support for some small electronic devices such as wireless sensors and smart switches. These devices usually have low power consumption and require little electricity. The power recovered by the lens can meet part or all of their operating needs, reduce dependence on external power supplies, and reduce overall energy consumption.

[0048] Supplement lighting system power supply: For some indoor places with high requirements for lighting stability, such as data centers and hospital operating rooms, the electricity generated by thermoelectric conversion can be stored in small batteries or supercapacitors. When there is a short-term failure of the mains power or the power supply is unstable, this stored electricity can be used as a backup power source to provide temporary power for the lighting system, ensuring the continuity of lighting and avoiding the inconvenience and potential risks caused by power outages.

[0049] Outdoor lighting scenes Smart street light system: In outdoor lighting such as urban roads and highways, there are a large number of LED street lights, which work for a long time and generate considerable heat. Through thermoelectric conversion technology, the heat energy generated by the street light lens is converted into electrical energy. On the one hand, it can power the street light's own control system (such as brightness adjustment module, communication module, etc.), realize intelligent management of street lights, and automatically adjust the brightness according to ambient light and traffic flow, further reducing energy consumption; on the other hand, the converted electrical energy can be fed back to the street light power supply network to provide supplementary power for other street lights or nearby small electrical equipment, thereby improving the energy efficiency of the entire outdoor lighting system.

[0050] Independent lighting systems in remote areas: In remote mountainous areas, islands and other areas with inconvenient electricity supply, independent LED lighting systems often rely on solar panels for power supply. However, at night or on rainy days, solar power supply may be insufficient. At this time, the thermoelectric properties of LED lenses can play a role, converting the heat energy generated by the lens when working into electrical energy, which is used together with the electricity generated by solar panels to power the lighting system, improving the reliability and stability of the system and reducing the need for external energy supply.

[0051] The following is a verification description of the thermoelectric performance of this LED combination lens: Purpose Verify whether the LED combination lens has thermoelectric properties, including the ability to generate potential difference, self-regulate heat dissipation, and energy recovery and reuse.

[0052] Experimental materials and equipment Experimental materials: several LED combination lenses prepared by the present invention, a heating device (such as a small heating furnace), a cooling device (such as a circulating water cooling system), a heat sink, a temperature sensor (thermocouple), a voltmeter, an ammeter, a rectifier circuit module, an energy storage capacitor (1000μF), a small DC fan (rated voltage 5V), and several wires.

[0053] Experimental equipment: infrared thermal imager, high-precision multimeter, temperature controller.

[0054] Experimental procedures Verification of the basic principle of thermoelectric effect Place the LED combination lens horizontally, with one end in close contact with the heating device and the other end connected to the cooling device to ensure that the heat can form a stable temperature gradient on the lens. Install temperature sensors at appropriate positions at both ends of the lens to monitor the temperature at both ends in real time.

[0055] Start the heating device and cooling device, set the heating end temperature The cooling end temperature is 80℃. The temperature is 20°C, forming a temperature gradient of 60°C. After the temperature stabilizes, use a voltmeter to measure the potential difference V generated at both ends of the lens and record the data.

[0056] Change the temperature gradient, adjust the heating end temperature to 90°C, keep the cooling end temperature at 20°C, measure the potential difference again and record it. Repeat this step to obtain the potential difference data under different temperature gradients and observe the relationship between the potential difference and the temperature gradient.

[0057] Thermoelectric performance parameter measurement Determination of Seebeck coefficient: Based on the potential difference data measured under different temperature gradients, the formula Calculate the Seebeck coefficient. Where, The Seebeck coefficients under multiple temperature gradients were calculated and the average value was taken as the Seebeck coefficient of the LED combination lens to evaluate its thermoelectric conversion capability.

[0058] Conductivity measurement: The conductivity of the lens is measured using the four-probe method. The four-probe electrodes are placed vertically and evenly on the lens surface and connected to a high-precision multimeter through wires. A known constant current I (e.g. 1 mA) is applied to the lens and the voltage drop between the electrodes is measured. According to the calculation formula of the four-probe method (where d is the probe spacing, and the probe spacing is set to a known fixed value) Calculate the conductivity .

[0059] Thermal conductivity test: Use the laser flash method to test the thermal conductivity of the lens. Process the lens sample into a suitable size (such as a disc with a diameter of 10mm and a thickness of 2mm) and put it into the laser flash thermal conductivity tester. According to the instrument operating instructions, heat and measure the sample to obtain the value of thermal conductivity k.

[0060] Self-regulating cooling function verification Two identical LED lamps are respectively installed with the LED combination lens and a common lens as a control, and the lamps are placed in a closed test environment and turned on to keep working.

[0061] Use an infrared thermal imager to scan the temperature of the lenses and surrounding areas of the two lamps every 10 minutes, and record the temperature distribution and changes. Continue monitoring for 1 hour to observe and compare the temperature rise trends of the two lenses.

[0062] Energy recovery and reuse verification The LED combination lens is installed in a special lamp, and a heat sink is set around the lamp to enhance the heat dissipation effect. A rectifier circuit module is connected to the output end of the lens thermoelectric conversion to convert the generated AC power into DC power, which is then connected to the energy storage capacitor for energy storage.

[0063] After the energy storage capacitor has been charged for a period of time (e.g. 30 minutes), disconnect it from the lens and connect the capacitor to a small DC fan to observe whether the fan can start normally and continue to run. Record the fan's operating time to evaluate the effect of energy recovery and reuse.

[0064] Experimental results and analysis The verification results of the basic principle of thermoelectric effect: Under different temperature gradients, it is detected that the potential difference is generated at both ends of the LED combination lens. As the temperature gradient increases, the potential difference also increases accordingly. Figure 5 As shown in the figure, when the temperature gradient is 60°C, the potential difference is measured to be 2.5mV; when the temperature gradient increases to 70°C, the potential difference increases to 3.0mV. This shows that the lens can generate a potential difference under the action of a temperature gradient, which is in line with the basic principle of the thermoelectric effect and preliminarily verifies its thermoelectric performance.

[0065] Thermoelectric performance parameter measurement results: The average Seebeck coefficient of the LED combination lens is calculated to be , indicating that the LED combined lens has a certain thermoelectric conversion capability. The conductivity measurement results are The thermal conductivity measurement results are The values ​​of these parameters reflect the electrical and thermal performance characteristics of the lens, and are compared with the general performance range of thermoelectric materials to further evaluate the quality of its thermoelectric performance.

[0066] Verification results of self-regulating heat dissipation function: The monitoring data of the infrared thermal imager shows that the temperature of the lamps equipped with this LED combination lens rises slowly within 1 hour, and the final stable temperature is about 5°C lower than that of the lamps equipped with ordinary lenses. This shows that during the operation of this LED combination lens, due to the thermoelectric effect, part of the heat is converted into electrical energy, achieving the self-regulating heat dissipation function and effectively reducing the temperature accumulation of the lens itself.

[0067] Energy recovery and reuse verification results: After charging for 30 minutes, the energy storage capacitor successfully drove the small DC fan to operate normally for 5 minutes. This shows that the LED combination lens can partially convert heat energy into electrical energy, and effectively store and utilize it, realizing energy recovery and reuse, and improving the energy utilization efficiency of the lighting system.

[0068] Experimental conclusion Through the above experiments, it is verified that the LED combination lens can generate a potential difference under the action of temperature gradient, and has certain thermoelectric performance parameters such as Seebeck coefficient, electrical conductivity and thermal conductivity. In practical applications, the lens can realize self-regulating heat dissipation function, reduce its own temperature accumulation, and at the same time, it can partially convert heat energy into electrical energy and recycle and reuse it to drive small loads. Therefore, it can be proved that the LED combination lens has thermoelectric performance, meets the expected design requirements, and has potential application value in energy saving and function optimization of lighting systems.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An LED combination lens, characterized in that: It comprises a lens body (1); The lens body (1) is integrally formed with a plurality of elliptical lenses (2); The raw materials of the elliptical lens (2) include polymethyl methacrylate, zinc oxide, bismuth selenium and silver; in: The raw materials are as follows by mass percentage: Polymethyl methacrylate: 57%-70%; Zinc oxide: 10%-20%; Bismuth selenium: 5%-15%; Silver: 2%-8%.

2. The LED combination lens according to claim 1, characterized in that: A lamp bead mounting plate (3) is mounted on the elliptical lens (2), and lamp beads are mounted on the lamp bead mounting plate (3).

3. The LED combination lens according to claim 2, characterized in that: The lamp bead is any one of lamp bead 1 (31) and lamp bead 2 (32).

4. The LED combined lens according to claim 3, characterized in that: The size of the lamp bead 1 (31) is 5mm*5mm, and the size of the lamp bead 2 (32) is 3mm*3mmmm.

5. The LED combined lens according to claim 4, characterized in that: The lamp beads 2 (32) on the lamp bead mounting plate (3) are arranged in a W shape.

6. A process for preparing a lens according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, dissolving polymethyl methacrylate in toluene organic solvent to form a uniform solution A; S2, adding zinc oxide, bismuth selenium and silver to solution A, and uniformly dispersing the substances by ultrasonic wave to obtain solution B; S3, performing a grafting reaction on the solution B at a reaction temperature of 60-80° C. for a reaction time of 4-6 hours, adding azobisisobutyronitrile catalyst to form a chemical bond, and obtaining a solution C; S4, doping reaction: adding silver nitrate solution to the solution C, adjusting the distribution and content of silver in the material, and obtaining a mixed solution; S5, injecting the mixed solution into a mold, and curing and molding it to obtain a lens.

7. The process for preparing a lens according to claim 6, characterized in that: The mass volume ratio of the toluene organic solvent is 30%-50%.

8. The process for preparing a lens according to claim 6, characterized in that: The frequency of the ultrasonic wave is 20-50 kHz.

9. The process for preparing a lens according to claim 6, characterized in that: The amount of azobisisobutyronitrile used is 0.5%-1.5% of the mass of polymethyl methacrylate.

10. The process for preparing a lens according to claim 6, characterized in that: Adding silver nitrate solution to the solution C comprises: Take analytically pure silver nitrate solid reagent, dissolve it in deionized water and dilute it to a concentration of 0.1-0.3 mol / L to form a silver nitrate solution; The silver nitrate solution is slowly added dropwise to the solution C after the grafting reaction, and the pH value of the reaction is adjusted to 8-10 by an alkaline regulator, and the reaction time is 2-3 hours.

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