One-way perspective multifunctional law enforcement shield and preparation method thereof

Abstract

The invention relates to the technical field of police equipment, in particular to a one-way perspective multifunctional law enforcement shield and a preparation method thereof.The one-way perspective multifunctional law enforcement shield comprises a shield body made of a polycarbonate material with high impact resistance and high stability, and the size of the shield body is 990 * 560 mm; the one-way perspective system is positioned in an interlayer in the shield main body and comprises a microprism array structure with an effective refractive index changing in a gradient manner and a mirror surface film treated by a nano optical coating; the functional module is arranged on the inner side of the shield main body and comprises a high-resolution law enforcement recorder, a flicker alarm lamp of a pulse driving circuit and a quick-release arm shield interface; and an optimized double curvature impact resistant housing and an ergonomic handle system; the one-way perspective system achieves the one-way light-transmitting effect that light rays on the outer side are almost totally reflected and light rays on the inner side penetrate through the one-way perspective system in a low-loss mode, the one-way perspective function is achieved, and the contradiction that a traditional shield cannot give consideration to view and concealment at the same time is solved. And the protection performance of the product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of police equipment, and in particular to a one-way perspective multifunctional law enforcement shield and a preparation method thereof. Background Art

[0002] Law enforcement shields are indispensable equipment for public security law enforcement, riot control and emergency response, and security protection tasks. Traditional shields are mostly made of metal (such as aluminum alloy, stainless steel) or high-strength plastic (such as polycarbonate). Although these materials have certain protective properties, they have obvious deficiencies in weight, flexibility, concealment, and functional integration. For example, metal shields are heavy and can easily cause fatigue to law enforcement officers after long-term use; although traditional plastic shields are light, they have limited impact resistance in extreme environments. In addition, traditional shields are mostly opaque or fully transparent in design, which cannot take into account both concealment and field of view requirements.

[0003] With the increasing complexity and confrontation of law enforcement scenes in the field of public security, higher requirements are placed on law enforcement equipment. The existing technology lacks a multifunctional law enforcement shield that can simultaneously achieve concealed observation, protection functions and evidence collection. Therefore, the development of a new law enforcement shield that integrates concealment, protection and intelligence is of great significance to improving law enforcement efficiency and ensuring the safety of law enforcement personnel. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to build a driver status monitoring system with high accuracy, strong adaptability and high robustness under the premise of protecting the driver's privacy, and be able to effectively deal with potential adversarial attack threats.

[0005] The purpose of the present invention is to provide a one-way perspective multifunctional law enforcement shield and a preparation method thereof, so as to solve the deficiencies of traditional law enforcement shields in concealment, functional integration and environmental adaptability through the deep integration of material science, optical engineering and equipment intelligence.

[0006] To achieve the above-mentioned purpose, the present invention provides a one-way perspective multifunctional law enforcement shield, comprising: a shield body, which is made of a high-impact and high-stability polycarbonate material and has a size of 990×560 mm; a one-way perspective system located in the inner interlayer of the shield body, comprising a microprism array structure with an equivalent refractive index gradient change and a mirror film treated with a nano-optical coating; a functional module arranged on the inner side of the shield body, the functional module comprising a high-resolution law enforcement recorder, a flashing warning light of a pulse drive circuit, and a quick-detachable arm shield interface; and an optimized hyperbolic impact-resistant shell and an ergonomic handle system; wherein the one-way perspective system achieves a one-way light transmission effect of nearly total reflection of outer light and low-loss penetration of inner light.

[0007] Preferably, the modified formula of the polycarbonate material comprises, by weight: 100 parts by weight of a base PC resin; 0.5-3.0 parts by weight of a π-π conjugated enhancer; 1.0-5.0 parts by weight of a cross-linking agent; 3.0-8.0 parts by weight of an impact modifier; 0.1-0.5 parts by weight of an antioxidant; 0.2-0.8 parts by weight of an ultraviolet absorber; and 0.1-0.3 parts by weight of a release agent.

[0008] Preferably, the material composition of the microprism array structure includes, by weight: 100 parts by weight of optical grade polymethyl methacrylate; 5-15 parts by weight of a flexible toughening agent; 0.5-3.0 parts by weight of a refractive index regulator; and 0.2-0.8 parts by weight of a light stabilizer; wherein the structural parameters of the microprism array include: a basic unit size of 50-100 μm, a prism angle of 36.5°-38.5°, an array arrangement of hexagonal close packing, a spacing of 55-105 μm, and a surface roughness of Ra≤0.05 μm.

[0009] Preferably, the mirror film material of the nano-optical coating comprises, by weight: 3-7 parts by weight of silver nanoparticle precursor; 10-20 parts by weight of titanium precursor; 2-6 parts by weight of polyvinyl pyrrolidone; 60-70 parts by weight of anhydrous ethanol; 20-30 parts by weight of isopropanol; and 0.5-1.5 parts by weight of stabilizer; wherein the mirror film is prepared by a magnetron sputtering process to form a TiO2 / Ag / TiO2 / Ag / TiO2 multilayer structure, with an outer reflectivity of ≥95% and an inner transmittance of ≥83%.

[0010] Preferably, the high-resolution law enforcement recorder includes: a BSI back-illuminated CMOS sensor with a resolution ≥12 million pixels and a minimum illumination of 0.001Lux; an F1.4 large aperture wide-angle lens with a focal length of 4.0-6.0mm, a field of view of 105°-115° horizontally and 70°-80° vertically; and an image processing unit that supports H.265 / HEVC encoding and 1080P / 60fps video recording; wherein the law enforcement recorder is installed in the upper central area of ​​the inner side of the shield, and is installed through a quick-release magnetic fixing base, 100-150mm away from the upper edge of the shield.

[0011] Preferably, the flashing warning light comprises: a GaN-based high-brightness LED light source with a brightness of 6500-7000 lumens per light; a pulse drive circuit with a dimming range of 10-100% and a strobe frequency of 0.5-30Hz; and a high thermal conductivity aluminum alloy heat dissipation system with a thermal resistance of ≤0.5℃ / W; wherein, there are 5 warning lights in total, which are arranged at the four corners and the center of the front of the shield in a "M" shape with a spacing of 400-450mm.

[0012] Preferably, the quick-detachable arm shield interface includes: a high-strength aviation-grade aluminum alloy base with a tensile strength of ≥570MPa; a titanium alloy buckling component with a tensile strength of ≥900MPa; a thermoplastic polyurethane elastomer buffer pad with a hardness of 85-95ShoreA; and a spring-assisted double locking mechanism with a locking strength that can withstand a shear force of ≥800N without failure; wherein, the arm shield interface is installed in the lower central area on the inner side of the shield and is fixed with 12-point bolts with a minimum pull-out force of ≥2000N.

[0013] Preferably, the structural parameters of the double-curvature impact-resistant shell include: central area thickness 8-10mm, edge area thickness 10-12mm, handle connection area thickness 12-15mm; primary curvature radius 1200-1500mm, secondary curvature radius 800-1000mm; shield body surface density 4.0-4.5kg / m 2 , the total weight of the system is ≤7.0kg; the rib layout is a multi-directional rib grid structure, the main rib height is 8-10mm, the width is 5-7mm, the spacing is 150-200mm, the secondary rib height is 5-7mm, the width is 3-5mm, and the spacing is 80-120mm.

[0014] Preferably, the ergonomic handle system includes: a high-strength aluminum alloy frame with an anodized surface; a thermoplastic elastomer gripping part with a hardness of 60-70 ShoreA; an anti-slip coating of a silicone and EPDM blend material with a hardness of 45-55 ShoreA; and an adjustment system with an adjustable angle of 0-30°, 7 locking positions, and an adjustable height of ±50mm, and 5 locking positions; wherein the gripping part has a length of 120-140mm, a diameter of 30-35mm, an elliptical cross-section, a micro-textured anti-slip surface, and a friction coefficient ≥0.8.

[0015] The present invention also provides a method for preparing the above-mentioned one-way perspective multifunctional law enforcement shield, comprising the following steps: (1) preparing a modified PC material, first drying the basic PC resin at a temperature of 120±5°C for 4-6 hours; then mixing all additives evenly; then using a blending twin-screw extruder for melt blending, with a feed zone temperature of 210-230°C, a compression zone temperature of 240-260°C, a metering zone temperature of 260-280°C, a die head temperature of 250-270°C, and a screw speed of 150-200rpm; finally cooling in a water bath and granulating; (2) preparing a microprism array structure, first drying the PMMA resin at a temperature of 80±5°C for 3-4 hours; then adding the formula components and mixing evenly; then performing hot pressing molding using a precision hot pressing molding machine at a temperature of 160-180°C and a pressure of 10-15MPa; then performing microstructure processing using a laser micromachining system; and finally performing plasma (3) Preparation of Ag-TiO2 composite optical film, first preparing silver nanoparticle sol; then preparing TiO2 sol; then mixing the two sols to form Ag-TiO2 composite sol; then using a multi-target magnetron sputtering system for multilayer film deposition; finally vacuum annealing and cooling at 200-250°C; (4) Assembling the one-way perspective system, assembling the microprism array structure and the Ag-TiO2 composite optical film between the PC sheets according to the designed structure and fixing them with optical grade adhesives; (5) Integrating functional modules, including installing law enforcement recorders, flashing police light systems and quick-release arm shield interfaces; (6) Installing electrical systems, including battery systems, cable layouts and control panels; (7) Structural optimization and assembly, including the assembly of a hyperbolic impact-resistant shell and an ergonomic handle system; and (8) System testing and quality control, conducting comprehensive tests on the electrical system, optical system and mechanical strength.

[0016] The beneficial effects of the present invention are:

[0017] 1. It realizes the one-way perspective function, solving the contradiction that traditional shields cannot take into account both vision and concealment at the same time;

[0018] 2. Improved the protective performance of the product. The molecular chain structure of PC material can effectively disperse energy under complex stress conditions and improve impact resistance;

[0019] 3. It realizes a high degree of functional integration, integrating covert observation, evidence collection, warning and other functions;

[0020] 4. The product structure has been optimized, with a double-curvature impact-resistant shell and ergonomic handle system to improve comfort and flexibility;

[0021] 5. Enhanced environmental adaptability, can maintain good performance in extreme temperatures from -30℃ to 70℃ and various light conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the one-way perspective multifunctional law enforcement shield of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the one-way perspective system of the present invention;

[0024] Figure 3 is a cross-sectional view of the microprism array structure of the present invention;

[0025] Figure 4 The hierarchical structure diagram of the Ag-TiO2 composite optical film of the present invention;

[0026] Figure 5 This is a schematic diagram of the distribution of functional modules of the present invention;

[0027] Figure 6 This is a schematic diagram of the installation position of the law enforcement recorder of the present invention;

[0028] Figure 7 This is a schematic diagram of the layout of the warning light system of the present invention;

[0029] Figure 8 This is a schematic diagram of the quick-detachable arm shield interface structure of the present invention;

[0030] Fig. 9 This is a layout diagram of the double curvature impact-resistant shell reinforcement ribs of the present invention;

[0031] Fig.10 It is a schematic diagram of the structure of the ergonomic handle system of the present invention. DETAILED DESCRIPTION

[0032] Please refer to the attached Figure 1-10 The present invention discloses a one-way perspective multifunctional law enforcement shield.

[0033] Example 1: Basic structure of a one-way perspective multifunctional law enforcement shield

[0034] The one-way perspective multifunctional law enforcement shield of this embodiment includes the following main parts: a shield body, a one-way perspective system, a functional module and an optimized structure.

[0035] The shield body is made of high-impact and high-stability polycarbonate (PC) material, with a size of 990×560mm. This material has excellent impact resistance, and its unique molecular chain structure can disperse energy under complex stress conditions, effectively responding to sudden violent confrontation scenarios such as club strikes and projectile impacts.

[0036] The one-way perspective system is located in the inner layer of the shield. It constructs a microstructure based on optical principles (microprism array structure with gradient change of equivalent refractive index), and is matched with a mirror film treated with nano-optical coating. This design uses the Fresnel total reflection principle to achieve a one-way light transmission effect with nearly total reflection of the outer light and low loss penetration of the inner light, thus achieving an excellent one-way light transmission effect and helping law enforcement personnel to conduct covert investigations and collect evidence.

[0037] The functional modules include a high-resolution law enforcement recorder, a flashing warning light of a pulse drive circuit, and a quick-detachable arm shield interface. The law enforcement recorder is installed on the upper inner side of the shield, the flashing warning lights are distributed in five positions on the shield surface in a "M" shape, and the quick-detachable arm shield interface is located in the lower center area of ​​the inner side.

[0038] In terms of optimized structure, a double-curvature impact-resistant shell and an ergonomic handle system are used. The double-curvature design enhances the shield's anti-bending rigidity, while the ergonomic handle system improves comfort and operational flexibility.

[0039] Through the deep integration of material science, optical engineering and equipment intelligence, the law enforcement shield of this embodiment realizes the integration of "protection-observation-evidence collection" functions, avoiding tactical gaps caused by frequent equipment replacement, and at the same time solving the contradiction between concealment and field of view of traditional shields, providing law enforcement personnel with all-round safety protection.

[0040] Example 2: Formulation and preparation of modified PC material

[0041] This embodiment provides a formula of a modified PC material and a preparation method thereof, which are used to make a shield body.

[0042] The formula comprises, by weight, 100 parts by weight of a basic PC resin, 1.5 parts by weight of a π-π conjugated reinforcing agent, 2.5 parts by weight of a crosslinking agent, 5.0 parts by weight of an impact modifier, 0.3 parts by weight of an antioxidant, 0.5 parts by weight of an ultraviolet absorber and 0.2 parts by weight of a release agent.

[0043] Among them, the basic PC resin adopts Bayer 3108, density 1.20g / cm 3 , light transmittance 90%, bending strength 95MPa, impact strength 70kJ / m 2 , Vicat softening temperature is 150℃. The π-π conjugated enhancer is 1,1,2,2-tetraphenylethylene, which enhances the π-π conjugated effect between molecular segments to improve the impact resistance of the material. The crosslinking agent is Bayer N3300 polyisocyanate forms a three-dimensional network structure to enhance the thermal stability and mechanical strength of the material. The impact modifier is methyl methacrylate-butadiene-styrene terpolymer, which improves the energy dissipation rate of the material under dynamic impact load. The antioxidant is BASF 1010, to prevent oxidation and aging of materials. The UV absorber is from BASF P, protects the material from UV damage. The release agent is stearate, which improves processing performance.

[0044] The preparation method comprises the following steps: (1) first drying the basic PC resin at 120° C. for 5 hours to reduce the moisture content to below 0.01%; (2) then metering all additives according to the formula and mixing them evenly using a high-speed mixer at a rotation speed of 1800 rpm for 6 minutes; (3) then using a blending twin-screw extruder (L / D ratio of 34) for melt blending, with a feed zone temperature of 220° C., a compression zone temperature of 250° C., a metering zone temperature of 270° C., a head temperature of 260° C., a screw speed of 180 rpm, a screw back pressure of 4.0 MPa, and a residence time of 75 seconds; (4) finally cooling the product in a water bath at a water temperature of 20° C., adjusting the pelletizer speed to a particle size of about 3.5 mm, and drying the finished product at 100° C. for 3.5 hours, with a final moisture content of 0.01%.

[0045] After testing, the impact strength of the modified PC material is 42% higher than that of the basic PC, the Vicat softening temperature is increased by 8°C, and the anti-ultraviolet aging performance is excellent. After 1000 hours of ultraviolet accelerated aging, the light transmittance is only reduced by 2%, and the mechanical property fluctuation is less than 8% in the temperature range of -30°C to 70°C. The excellent performance of this modified PC material provides a solid material foundation for the one-way perspective multifunctional law enforcement shield, ensuring the structural stability and protection capability of the shield under extreme conditions.

[0046] In addition, it also includes 100 parts by weight of basic PC resin; 0.5 parts by weight of π-π conjugated reinforcing agent; 1.0 parts by weight of cross-linking agent; 3.0 parts by weight of impact modifier; 0.1 parts by weight of antioxidant; 0.2 parts by weight of ultraviolet absorber; and 0.1 parts by weight of release agent, and the preparation method is the same as above.

[0047] In addition, 100 parts by weight of base PC resin; 3.0 parts by weight of π-π conjugated reinforcing agent; 5.0 parts by weight of crosslinking agent; 8.0 parts by weight of impact modifier; 0.5 parts by weight of antioxidant; 0.8 parts by weight of ultraviolet absorber; and 0.3 parts by weight of release agent, the preparation method is the same as above.

[0048] Example 3: Preparation of microprism array structure

[0049] This embodiment provides a material composition and a preparation method of a micro-prism array structure, which is one of the core components of a one-way perspective system.

[0050] The material composition includes, by weight: 100 parts by weight of optical-grade PMMA, 10 parts by weight of a flexible toughening agent, 1.5 parts by weight of a refractive index regulator, and 0.5 parts by weight of a light stabilizer.

[0051] Among them, optical grade PMMA adopts Asahi Chemical 80N, light transmittance 93%, refractive index 1.491. The flexible toughening agent is Rohm and Haas B-44 (butyl methacrylate-methyl methacrylate copolymer) improves the impact resistance and fatigue resistance of the material. The refractive index regulator is Solvay DPS sulfoaryl sulfone fine-tunes the refractive index of PMMA to match the optical design requirements. The light stabilizer is BASF 123 Hindered amine light stabilizer improves the stability of materials in strong light environments.

[0052] The micro-prism array structural design parameters are: basic unit size 75μm, prism angle 37.5°, array arrangement is hexagonal close packing, spacing 80μm, surface roughness Ra is 0.03μm. These precise structural parameters are designed based on the Fresnel total reflection principle to ensure that light can selectively pass or reflect at a specific angle to achieve a one-way perspective function.

[0053] The preparation method comprises the following steps: (1) first drying the PMMA resin at 80°C for 3.5 hours to control the moisture content below 0.03%; (2) then weighing all additives according to the formula and mixing them evenly; (3) then using a precision hot pressing molding machine for hot pressing molding at a temperature of 170°C, a pressure of 12MPa, a holding time of 75 seconds, and a cooling rate of 4°C / minute; (4) then using a laser micromachining system (laser wavelength of 355nm, pulse width of 12ns) for microstructure precision machining to form a microprism array; (5) finally performing plasma surface activation (oxygen atmosphere, power of 250W, time of 45 seconds) and hard coating treatment to enhance the surface wear resistance and chemical resistance.

[0054] This micro-prism array structure is a key component of the one-way perspective system. Its precise micro-structure design allows light to be fully reflected in a specific direction, forming a directional control optical effect. Combined with the nano-optical coating, it achieves a one-way light transmission effect with nearly total reflection of the outer light and low-loss penetration of the inner light, providing law enforcement officers with the dual capabilities of covert observation and protection.

[0055] In addition, the material composition of the microprism array structure includes, by weight: 100 parts by weight of optical grade polymethyl methacrylate; 5 parts by weight of a flexible toughening agent; 0.5 parts by weight of a refractive index regulator; and 0.2 parts by weight of a light stabilizer; wherein the structural parameters of the microprism array include: a basic unit size of 50 μm, a prism angle of 36.5°, an array arrangement of hexagonal close packing, a spacing of 55 μm, a surface roughness Ra≤0.05 μm, and the preparation method is the same as above.

[0056] In addition, the material composition of the microprism array structure includes, by weight: 100 parts by weight of optical grade polymethyl methacrylate; 15 parts by weight of a flexible toughening agent; 3.0 parts by weight of a refractive index regulator; and 0.8 parts by weight of a light stabilizer; wherein the structural parameters of the microprism array include: a basic unit size of 100 μm, a prism angle of 38.5°, an array arrangement of hexagonal close packing, a spacing of 105 μm, a surface roughness Ra ≤ 0.05 μm, and the preparation method is the same as above.

[0057] Example 4: Preparation of Ag-TiO2 composite optical film

[0058] This embodiment provides a material composition and a preparation method of a Ag-TiO2 composite optical film, which is another core component of a one-way perspective system.

[0059] The material composition includes, by weight: 5 parts by weight of silver nanoparticle precursor, 15 parts by weight of titanium precursor, 4 parts by weight of polyvinyl pyrrolidone, 65 parts by weight of anhydrous ethanol, 25 parts by weight of isopropanol and 1.0 part by weight of stabilizer.

[0060] Among them, the silver nanoparticle precursor is silver nitrate (AgNO3, analytical grade), the titanium precursor is tetrabutyl titanate (Ti(OC4H9)4, chemically pure), polyvinyl pyrrolidone (PVP, K30 type) is used as a protective agent, anhydrous ethanol and isopropanol constitute the solvent system, and the stabilizer is citric acid.

[0061] The preparation method comprises the following steps: (1) preparing silver nanoparticle sol: dissolving silver nitrate in anhydrous ethanol at a concentration of 0.2 mol / L, adding PVP as a protective agent, the molar ratio of PVP to silver being 1:6, stirring and reacting for 2.5 hours at a temperature of 65° C. under nitrogen protection, using sodium borohydride as a reducing agent at a dropping rate of 2.5 mL / min, cooling to room temperature after the reaction is completed, and obtaining silver nanoparticle sol;

[0062] (2) Preparation of TiO2 sol: Tetrabutyl titanate and isopropanol were mixed at a volume ratio of 1:5, acetylacetone was slowly added dropwise as a chelating agent, the molar ratio of tetrabutyl titanate to acetylacetone was 1:1, deionized water was added, the hydrolysis ratio (H2O:Ti) was 3:1, and the mixture was stirred at 28°C for 5 hours to obtain a transparent TiO2 sol;

[0063] (3) Preparation of Ag-TiO2 composite sol: silver nanoparticle sol and TiO2 sol were mixed at a molar ratio of silver to titanium of 1.5:8.5, citric acid stabilizer was added at a concentration of 0.03 mol / L, ultrasonic dispersion treatment was performed at a power of 400 W for 20 minutes, and the mixture was stirred and aged at 70°C for 5 hours to obtain a uniform Ag-TiO2 composite sol;

[0064] (4) Magnetron sputtering coating: using a multi-target magnetron sputtering system with a vacuum degree of 3×10 -4 Pa, Ag target power 250W, Ti target power 350W, sputtering gas pressure 0.4Pa, oxygen partial pressure 0.08Pa, substrate temperature 125℃, rotation speed 8rpm, deposition according to the five-layer structure of TiO2(60nm) / Ag(10nm) / TiO2(90nm) / Ag(10nm) / TiO2(60nm);

[0065] (5) Post-treatment: vacuum annealing at 225°C for 75 minutes, cooling to room temperature, testing the optical properties, and finally coating a silicone-based wear-resistant protective layer with a thickness of 2 μm.

[0066] The Ag-TiO2 composite optical film has excellent optical properties, with an outer reflectivity of 96% (wavelength range: 400-700nm), an inner transmittance of 85% (wavelength range: 400-700nm), performance fluctuation of less than 8% within the ±40° viewing angle range, excellent weather resistance, and performance degradation of only 3% after 2000 hours of accelerated aging test. This high-performance optical film works in synergy with the microprism array structure to form a stable and efficient one-way perspective effect, allowing law enforcement officers to clearly observe external conditions while remaining concealed.

[0067] Preferably, the mirror film material of the nano-optical coating comprises, by weight: 3 parts by weight of silver nanoparticle precursor; 10 parts by weight of titanium precursor; 2 parts by weight of polyvinyl pyrrolidone; 60 parts by weight of anhydrous ethanol; 20 parts by weight of isopropanol; and 0.5 parts by weight of stabilizer; wherein the mirror film is prepared by a magnetron sputtering process to form a TiO2 / Ag / TiO2 / Ag / TiO2 multilayer structure, with an outer reflectivity of ≥95% and an inner transmittance of ≥83%.

[0068] Preferably, the mirror film material of the nano-optical coating comprises, by weight: 7 parts by weight of silver nanoparticle precursor; 20 parts by weight of titanium precursor; 6 parts by weight of polyvinyl pyrrolidone; 70 parts by weight of anhydrous ethanol; 30 parts by weight of isopropanol; and 1.5 parts by weight of stabilizer; wherein the mirror film is prepared by a magnetron sputtering process to form a TiO2 / Ag / TiO2 / Ag / TiO2 multilayer structure, with an outer reflectivity of ≥95% and an inner transmittance of ≥83%.

[0069] Example 5: Assembly of a one-way perspective system

[0070] This embodiment provides an assembly method of a one-way perspective system, which effectively integrates a microprism array structure and an Ag-TiO2 composite optical film to form a complete one-way perspective functional unit.

[0071] The assembly steps are as follows: (1) PC sheet preparation: First, the PC sheet was cut into the required size (990 × 560 mm, thickness 4 mm) using a high-precision CNC cutting machine with a positioning accuracy of ±0.03 mm, and then edge grinding wheel polishing was performed, using 240-mesh and 600-mesh sanding belts in turn, with a 45° chamfer of 1.8 mm, and finally ultrasonic cleaning was performed in a dust-free environment using anhydrous ethanol and deionized water, hot air drying at 40 °C for 18 min, and then oxygen plasma surface activation was performed with a power of 250 W for 40 s;

[0072] (2) Assembly of microprism array layer: In an ISO 7 clean room (temperature 22°C, relative humidity 45%), the microprism array structure prepared in Example 3 was placed face-inward on the first layer of PC board, and was glued with optical grade epoxy resin glue (refractive index 1.50) to control the glue layer thickness to 30 μm. Vacuum degassing (vacuum degree 5 Pa, 8 minutes) was performed, and then UV light curing was performed with a wavelength of 365 nm and a light intensity of 90 mW / cm 2 , curing time 75 seconds;

[0073] (3) Ag-TiO2 optical film assembly: Ag-TiO2 composite film is deposited on the surface of the microprism array using the method of Example 4, and quality inspection is performed after completion, including transmission and reflection spectrum test and appearance inspection;

[0074] (4) Second PC board assembly: The second PC board is combined with the first PC board with the microprism array and the Ag-TiO2 film, and the edges are sealed with optical grade liquid silicone rubber (LSR, refractive index 1.42), vacuum injection (vacuum degree 30Pa, injection pressure 0.2MPa), and thermal curing (temperature 130°C, time 50 minutes);

[0075] (5) Quality Inspection: The assembled one-way perspective system is comprehensively inspected, including optical performance testing (one-way perspective effect, internal and external transmittance and reflectivity), physical performance testing (sealing, impact resistance, temperature adaptability testing), and environmental adaptability testing (evaluation of perspective effect under different lighting conditions).

[0076] This precise assembly process ensures the optical performance and physical stability of the one-way perspective system. Test results show that the reflectivity on the outside reaches 96%, the transmittance on the inside reaches 85%, the performance is stable in the temperature range of -30℃ to 70℃, there is no functional loss after a 100J impact test, and the one-way perspective effect can be maintained stably under various lighting conditions (from 100lux to 100,000lux).

[0077] This one-way perspective system is the core technological breakthrough of the present invention, which solves the problem that traditional shields cannot take into account both concealment and field of view at the same time, and provides technical support for the safety protection and tactical advantages of law enforcement personnel in complex environments.

[0078] Example 6: Integration of high-resolution law enforcement recorders

[0079] This embodiment provides specifications of a high-resolution law enforcement recorder and an integration method thereof. The recorder is an important component of the functional module.

[0080] The parameters and specifications of the law enforcement recorder are as follows: The sensor uses a 1 / 1.8-inch BSI back-illuminated CMOS sensor with a resolution of 12 million pixels, a sensitivity of ISO100-102400, a dynamic range of 122dB, and a minimum illumination of 0.001Lux (color mode) and 0.0003Lux (black and white mode). The lens system is an F1.4 large aperture wide-angle lens with a focal length of 5.0mm (equivalent to 35mm: 30mm), a field of view of 110° horizontally and 75° vertically, multi-layer low-reflection coating, and a transmittance of 99%. The image processing unit uses a high-performance ISP, supports H.265 / HEVC encoding, 1080P / 60fps video recording, built-in 64GB high-speed flash memory, and supports encrypted storage and loop recording.

[0081] The integration method includes the following steps: (1) preparation of the installation position: opening an installation hole in the central area of ​​the upper inner side of the shield, with a diameter of 53 mm and a distance of 125 mm from the upper edge of the shield, gluing and strengthening the edge, increasing the local thickness by 2.5 mm, performing stress relief treatment, local annealing, and keeping the temperature at 120°C for 30 minutes;

[0082] (2) Recorder installation: A special snap-on quick-release base is used, fixed at three points, and the installation height is 125 mm from the upper edge of the shield. The internal shock absorption uses a silicone rubber gasket with a thickness of 2.5 mm and a hardness of 35ShoreA. The sealing treatment uses an EPDM rubber sealing ring with a compression rate of 35%;

[0083] (3) Electrical connection: Use a miniature waterproof connector (IP67 protection level), route the cables along the inner frame, set a fixing point every 80 mm, and install ferrite rings at key connection points to suppress electromagnetic interference;

[0084] (4) Power system connection: It uses a high-energy-density lithium polymer battery (3.7V, 6000mAh), has a working time of about 15 hours, supports Type-C fast charging, and is equipped with a low-temperature protection circuit to ensure that the battery capacity remains above 85% in an environment of -20°C;

[0085] (5) Control system integration: The control button is located near the handle for easy one-handed operation. Function keys such as recording, taking photos, and switching are set. The surface adopts a raised tactile design to facilitate law enforcement officers to operate accurately without looking at the buttons.

[0086] The integrated law enforcement recorder is completely embedded in the shield structure, which does not affect the user's sight and operation. It can maintain stable high-quality recording in various complex environments, especially in low-light environments, and can still obtain clear images, providing reliable technical support for covert investigation and evidence collection. At the same time, the quick-release design is easy to maintain and replace. The entire system is waterproof and dustproof with an IP67 rating and can withstand a free fall impact from a height of 1.5 meters.

[0087] Example 7: Integration of pulse-driven LED warning light system

[0088] This embodiment provides specifications of a pulse-driven LED warning light system and an integration method thereof. The system is another important component of the functional module.

[0089] The parameters and specifications of the LED warning light system are as follows: The light source uses Cree XHP70.2 series GaN-based high-brightness LEDs, with a brightness of 6800 lumens per LED, and a color temperature of 6200K (white light) and 460nm (blue light). The drive circuit uses an ARMCortex-M4 core microcontroller (operating frequency 100MHz) and TI's TPS92513 pulse driver IC, with a dimming range of 10-100%, 256 levels of brightness adjustment, and a programmable strobe frequency of 0.5-30Hz. The heat dissipation system uses a high thermal conductivity aluminum alloy heat sink with a thermal conductivity of 190W / m·K and a heat dissipation area of ​​18cm 2 / W, thermal resistance 0.3℃ / W.

[0090] The integration method includes the following steps: (1) Preparation of lamp installation holes: Prepare 5 lamp installation holes on the front of the shield, with a diameter of 31 mm, distributed at the four corners and the center, in a "M" shape, with a distance of 425 mm between the center points of adjacent lamps, and an epoxy resin reinforcement ring with a width of 9 mm for edge reinforcement treatment;

[0091] (2) Lighting module installation: The fixture is fixed by a snap-on combined with a threaded locking ring, and the seal is made of a nitrile rubber O-ring (3.5×1.5mm). The heat dissipation treatment uses an aluminum alloy heat dissipation base, and thermal conductive silicone grease is applied between the base and the shield to enhance heat conduction;

[0092] (3) Control system installation: The main control circuit uses a centralized control box, which is installed in the lower area inside the shield. It is equipped with three function buttons (mode selection, brightness adjustment, and emergency mode). A bus connection method is used to reduce the complexity of cables. TPU material protective sleeves are used for cable protection.

[0093] (4) Power management system: It uses two 18650 lithium-ion batteries (3.7V, 3400mAh, Panasonic NCR18650B). The battery compartments are symmetrically distributed on both sides of the inner side of the shield. It uses an intelligent power monitoring system and has a low-battery reminder function. The battery life is 4.5 hours in the highest brightness mode and up to 14 hours in the energy-saving mode.

[0094] (5) Special function settings: The ambient light sensing system automatically adjusts the brightness to adapt to the environment. In emergency mode, the highest brightness and special strobe mode (15Hz) can be activated by one button. When multiple shields are linked, the warning lights can flash synchronously.

[0095] This police light system can provide efficient warning functions in various environmental conditions. The automatic light intensity adjustment function ensures optimal visibility in different light environments while avoiding unnecessary energy consumption. The special strobe mode helps to attract attention in emergency situations and provides additional safety for law enforcement officers. The efficient heat dissipation system ensures stable LED performance and extended service life during continuous use.

[0096] Example 8: Integration of quick-release arm shield interface system

[0097] This embodiment provides specifications of a quick-detachable arm-shield interface system and an integration method thereof, which enables the shield to have modular expansion capabilities.

[0098] The arm shield interface system parameters are as follows: The interface base is made of 7075-T6 high-strength aviation-grade aluminum alloy with a tensile strength of 585MPa, a yield strength of 525MPa, and a density of 2.75g / cm 3 The fastening parts are made of Ti-6Al-4V titanium alloy, with a tensile strength of 950MPa, a yield strength of 880MPa, and a density of 4.45g / cm 3 ; The buffer pad is made of thermoplastic polyurethane elastomer (TPU) with a hardness of 90ShoreA; the locking mechanism is a spring-assisted double locking mechanism, the spring material is 17-7PH stainless steel, the locking strength can withstand 900N shear force without failure, and the unlocking method is a one-handed press-type quick unlocking device.

[0099] The integration method includes the following steps: (1) base installation: the base is installed in the lower central area of ​​the inner side of the shield, using a 12-point bolt fixing method (M6×1.0 stainless steel countersunk bolts), with a fixing strength of a minimum pull-out force of 2500N and a bolt tightening torque of 9N·m;

[0100] (2) Installation of the locking mechanism: The locking mechanism adopts a rotating snap-on design, which can be locked after 1 / 4 turn after insertion. The three-point positioning protrusion and receiving groove are installed to ensure precise alignment. The anti-misoperation design allows it to be inserted only at the correct angle;

[0101] (3) Buffer system installation: Install a TPU buffer pad between the interface base and the shield contact surface, with a thickness of 3 mm and a hardness of 90 Shore A. The edge of the buffer pad is chamfered to reduce stress concentration;

[0102] (4) Installation of emergency disengagement mechanism: Install an emergency disengagement spring inside the fastening component and adjust the spring preload so that it can be forced to disengage when subjected to a pulling force of 120N in a specific direction, while ensuring that it will not be accidentally disengaged during normal use;

[0103] (5) Compatibility test: Compatibility test of a small multifunctional arm shield (size 300×200 mm, weight 1.2 kg) and a one-way light-transmitting small shield (size 350×250 mm, weight 1.8 kg) was conducted. Well-trained operators can complete the component replacement operation within 3 seconds.

[0104] This quick-detachable arm shield interface system greatly improves the modularity and adaptability of the law enforcement shield. Law enforcement officers can quickly replace different functional modules according to different law enforcement scenarios, such as using a reinforced arm shield for riot control and a small one-way light-transmitting shield for covert observation. The strength design of the system ensures a stable and reliable connection during normal use, while the emergency detachment function provides safety protection for emergencies. The careful selection of materials and the optimized design of the structure have achieved a good balance between lightweight and high strength for the entire system.

[0105] Example 9: Integration of double curvature impact-resistant shell and ergonomic handle system

[0106] This embodiment provides specifications for a double-curvature impact-resistant shell and an ergonomic handle system and an integration method thereof. These optimized structures significantly improve the user experience and protective performance.

[0107] The parameters of the hyperbolic impact-resistant shell are as follows: the thickness of the central area is 9mm, the thickness of the edge area is 11mm, and the thickness of the handle connection area is 14mm; the main curvature radius is 1350mm (horizontally), the secondary curvature radius is 900mm (vertically), and the hyperbolic fusion adopts the B-spline surface transition algorithm; the surface density of the shield body is 4.2kg / m2 The total weight of the functional module is 1.3kg, and the total weight of the system is 6.5kg; the reinforcing ribs adopt a multi-directional grid structure, with the main ribs 9mm high, 6mm wide, and 175mm apart; the secondary ribs are 6mm high, 4mm wide, and 100mm apart.

[0108] The parameters of the ergonomic handle system are as follows: the frame is made of 7075-T6 high-strength aluminum alloy with anodized surface; the grip part is made of thermoplastic elastomer with a hardness of 65ShoreA; the anti-slip covering is made of a blend of silicone and EPDM with a hardness of 50ShoreA; the adjustment system angle can be adjusted from 0-30°, 7 locking positions can be set, the height can be adjusted by ±50mm, 5 locking positions can be set, and the handle spacing can be adjusted from 120-180mm; the grip part is 130mm long and 32mm in diameter (elliptical cross-section), the surface is a micro-textured anti-slip surface with a friction coefficient of 0.9.

[0109] The integration method includes the following steps: (1) shell body production: based on the finite element analysis optimization results, modified PC material is used for injection molding, with a mold temperature of 110°C, an injection temperature of 280°C, an injection pressure of 150 MPa, a holding time of 25 seconds, and a cooling time of 50 seconds;

[0110] (2) Layout and installation of reinforcement ribs: Install reinforcement ribs in high stress areas according to the design drawings, use structural adhesive (3MDP460) for bonding, the adhesive layer thickness is 1.5 mm, cure at room temperature for 24 hours, and then perform mechanical fixation to prevent accidental falling off;

[0111] (3) Edge treatment: Aramid fiber reinforced epoxy resin is used for edge coating, with a width of 18 mm and a thickness of 2.5 mm. The pressure molding process is used with a pressure of 2 MPa and a temperature of 160°C for 30 minutes.

[0112] (4) Handle system installation: The handle frame is fixed to the inside of the shield with 8 M8 anti-loosening bolts, with a tightening torque of 15 N·m. The grip part and the anti-slip coating are integrally formed by two-color injection molding. The adjustment system adopts precision gear transmission, and the locking adopts a spring-assisted ratchet mechanism.

[0113] (5) Auxiliary function installation: The warning light and recorder control buttons are integrated on the handle. The layout is ergonomic and convenient for one-handed operation during the use of the shield. The wrist support pad is installed at the rear end of the handle to reduce fatigue during long-term use.

[0114] This structural design greatly improves the protection capability and comfort of the law enforcement shield. The double curvature shell design enables the shield to disperse energy more effectively when impacted, and the bending stiffness is 19% higher than that of traditional flat shields; the rib layout is based on precise finite element analysis to ensure sufficient support in key areas; the edge treatment enhances the overall rigidity of the shield. The ergonomic handle system greatly improves the control experience. The adjustable design makes it suitable for users of different body shapes. The anti-slip coating and the design that conforms to the human hand shape reduce fatigue after long-term use, and the integrated control buttons make operation more convenient.

[0115] Example 10: Complete preparation method of one-way perspective multifunctional law enforcement shield

[0116] This embodiment provides a complete preparation method for a one-way perspective multifunctional law enforcement shield, which integrates the technical solutions of the aforementioned embodiments to form a systematic manufacturing process.

[0117] The preparation method comprises the following steps: (1) preparing a modified PC material: firstly drying a basic PC resin at 120° C. for 5 hours, and controlling the moisture content to be below 0.01%; then mixing a π-π conjugated reinforcing agent, a crosslinking agent, an impact modifier, an antioxidant, an ultraviolet absorber and a release agent uniformly according to a formula; then using a blending twin-screw extruder for melt blending, with a feed zone temperature of 220° C., a compression zone temperature of 250° C., a metering zone temperature of 270° C., a die head temperature of 260° C., and a screw speed of 180 rpm; finally cooling and granulating in a water bath, and drying, and controlling the final moisture content to be below 0.01%;

[0118] (2) Preparation of microprism array structure: First, PMMA resin was dried at 80°C for 3.5 hours; then, a flexible toughening agent, a refractive index regulator and a light stabilizer were added and mixed evenly; then, a precision hot press molding machine was used for hot press molding at a temperature of 170°C and a pressure of 12 MPa; then, a laser micromachining system was used for microstructure precision machining; finally, plasma surface activation and hard coating treatment were performed;

[0119] (3) Preparation of Ag-TiO2 composite optical film: First, prepare silver nanoparticle sol, dissolve silver nitrate in anhydrous ethanol, add PVP as a protective agent, react under nitrogen protection, and use sodium borohydride for reduction; then prepare TiO2 sol, mix tetrabutyl titanate with isopropyl alcohol, add acetylacetone and deionized water; then mix the two sols to form Ag-TiO2 composite sol; then use a multi-target magnetron sputtering system to deposit multilayer films to form a five-layer structure of TiO2 / Ag / TiO2 / Ag / TiO2; finally, vacuum anneal at 225°C for 75 minutes and apply a protective layer;

[0120] (4) Assembly of the one-way vision system: First, the PC sheet is cut into specifications, and the edge treatment and surface cleaning and activation are performed; then the microprism array layer is installed on the first layer of PC sheet; then the Ag-TiO2 composite film is deposited on the surface of the microprism; then the second layer of PC sheet is combined with the treated first layer of PC sheet and the edge is sealed; finally, quality inspection is performed to ensure that the optical performance and physical stability meet the requirements;

[0121] (5) Production of double curvature impact-resistant shell: Based on the optimization results of finite element analysis, modified PC material is used for injection molding, reinforcing ribs are installed, and edge treatment is performed;

[0122] (6) Functional module integration: Install a high-resolution law enforcement recorder located in the upper center area of ​​the inner side of the shield; install an LED warning light system distributed in the four corners and the center of the front of the shield; install a quick-release arm shield interface located in the lower center area of ​​the inner side of the shield;

[0123] (7) Installation of ergonomic handle system: fix the handle frame to the inside of the shield, install the grip part and anti-slip coating, debug the adjustment system, and integrate the control buttons;

[0124] (8) Electrical system integration: installing battery system, laying cables, installing control panels and interfaces;

[0125] (9) Final assembly and testing: Conduct system integration tests, including electrical system tests, optical system tests, and mechanical strength tests; conduct environmental adaptability tests, including temperature cycle tests, damp heat tests, and salt spray tests; and finally, conduct a comprehensive appearance and functional inspection to ensure that all systems are functioning properly.

[0126] This complete preparation method can produce a one-way perspective multifunctional law enforcement shield with excellent performance. This shield can provide all-round security and tactical advantages in complex law enforcement environments, and has reached industry-leading levels in terms of concealment, protection capabilities and functional integration.

[0127] Example 11: Application of the one-way perspective multifunctional law enforcement shield in riot control

[0128] This embodiment demonstrates the actual application effect of the one-way perspective multifunctional law enforcement shield in riot control.

[0129] During the handling of a large-scale mass incident, the law enforcement team was equipped with the one-way perspective multifunctional law enforcement shield of the present invention. The on-site environment was complex, there was strong confrontation, and the light conditions were variable (from bright outdoor to dim indoor environment).

[0130] The application process is as follows: (1) The law enforcement officer first checks the working status of each functional module of the shield, confirms that the law enforcement recorder has sufficient power (displayed as 95%), the warning light system works normally, and the quick-release arm shield interface is firmly locked;

[0131] (2) Before entering the site, a small multifunctional arm shield is installed on the quick-release interface according to mission requirements to enhance protection capabilities. The entire installation process takes only 4 seconds;

[0132] (3) In bright outdoor environments (about 75,000 lux), the one-way perspective system performs well. Outside personnel cannot see the law enforcement officers inside the shield, while the law enforcement officers can clearly observe the external situation. The perspective effect is not affected by strong light.

[0133] (4) After entering a relatively dim indoor environment (about 150 lux), law enforcement officers activate the strong light mode of the police light system (brightness 80%), which effectively illuminates and serves as a warning. At the same time, the one-way perspective system still maintains a good perspective effect in a low-light environment;

[0134] (5) During the entire handling process, the law enforcement recorder worked throughout the process, recording clear video evidence even in low-light environments, successfully capturing key evidence information;

[0135] (6) During the disposal process, the shield was subjected to multiple impacts and projectile attacks, the maximum impact energy of which was about 450J. The shield structure was intact and all functional modules continued to work normally;

[0136] (7) The law enforcement mission lasts about 4 hours. The ergonomic handle system significantly reduces the fatigue of law enforcement officers. The adjustment system enables law enforcement officers of different body shapes to find a comfortable grip position.

[0137] (8) After the mission was completed, the arm shield assembly was quickly disassembled, the shield surface was cleaned, and the status of each functional module was checked. The law enforcement recorder stored approximately 240 minutes of high-definition video evidence, and the remaining power of the police light system was approximately 40%.

[0138] This practical application proves that the one-way perspective multifunctional law enforcement shield of the present invention has significant advantages in high-intensity, high-risk law enforcement scenarios such as riot control: the one-way perspective function provides tactical concealment and vision protection for law enforcement personnel; the multifunctional integrated design reduces the need for equipment replacement and improves operational efficiency; the optimized structural design ensures comfort and protection for long-term use; and the evidence collection function provides reliable evidence support for subsequent work.

[0139] The one-way perspective multifunctional law enforcement shield of the present invention can be widely used in various law enforcement scenarios of public security organs, including but not limited to:

[0140] Handling of mass incidents: Using one-way perspective function and protection capabilities to effectively deal with complex confrontation environments;

[0141] VIP protection: Improve security effectiveness through covert observation and evidence collection functions;

[0142] Traffic management: Use police light systems and law enforcement recorders to improve traffic management efficiency and safety;

[0143] Emergency response to emergencies: Modular design adapts to different environmental requirements and quickly responds to various emergencies.

[0144] The invention has undergone rigorous performance testing and practical application verification, and has good industrial applicability and promotion value. It can provide powerful equipment support for public security law enforcement and promote the modernization of police equipment.

[0145] It should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A one-way perspective multifunctional law enforcement shield, characterized in that: include: The shield body is made of high-impact and high-stability polycarbonate material, with a size of 990×560mm; the one-way perspective system located in the inner interlayer of the shield body includes a microprism array structure with an equivalent refractive index gradient change and a mirror film treated with a nano-optical coating; the functional modules arranged on the inner side of the shield body include a high-resolution law enforcement recorder, a flashing warning light of a pulse drive circuit, and a quick-detachable arm shield interface; as well as an optimized hyperbolic impact-resistant shell and an ergonomic handle system; wherein the one-way perspective system achieves a one-way light transmission effect with nearly total reflection of outer light and low-loss penetration of inner light.

2. The one-way perspective multifunctional law enforcement shield according to claim 1 is characterized in that: The modified formula of the polycarbonate material includes, by weight: 100 parts by weight of a basic PC resin; 0.5-3.0 parts by weight of a π-π conjugated reinforcing agent; 1.0-5.0 parts by weight of a crosslinking agent; 3.0-8.0 parts by weight of an impact modifier; 0.1-0.5 parts by weight of an antioxidant; 0.2-0.8 parts by weight of an ultraviolet absorber; and 0.1-0.3 parts by weight of a release agent.

3. The one-way perspective multifunctional law enforcement shield according to claim 1 is characterized in that: The material composition of the microprism array structure includes, by weight: 100 parts by weight of optical grade polymethyl methacrylate; 5-15 parts by weight of a flexible toughening agent; 0.5-3.0 parts by weight of a refractive index regulator; and 0.2-0.8 parts by weight of a light stabilizer; wherein the structural parameters of the microprism array include: a basic unit size of 50-100 μm, a prism angle of 36.5°-38.5°, an array arrangement of hexagonal close packing, a spacing of 55-105 μm, and a surface roughness of Ra≤0.05 μm.

4. The one-way perspective multifunctional law enforcement shield according to claim 1 is characterized in that: The mirror film material of the nano-optical coating includes, by weight: 3-7 parts by weight of silver nanoparticle precursor; 10-20 parts by weight of titanium precursor; 2-6 parts by weight of polyvinyl pyrrolidone; 60-70 parts by weight of anhydrous ethanol; 20-30 parts by weight of isopropanol; and 0.5-1.5 parts by weight of stabilizer; wherein the mirror film is prepared by a magnetron sputtering process to form a TiO2 / Ag / TiO2 / Ag / TiO2 multilayer structure, with an outer reflectivity of ≥95% and an inner transmittance of ≥83%.

5. The one-way perspective multifunctional law enforcement shield according to claim 1 is characterized in that: The high-resolution law enforcement recorder includes: a BSI back-illuminated CMOS sensor with a resolution ≥12 million pixels and a minimum illumination of 0.001Lux; an F1.4 large aperture wide-angle lens with a focal length of 4.0-6.0mm, a field of view of 105°-115° horizontally and 70°-80° vertically; and an image processing unit that supports H.265 / HEVC encoding and 1080P / 60fps video recording; wherein the law enforcement recorder is installed in the upper central area of ​​the inner side of the shield, and is installed through a quick-release magnetic fixing base, 100-150mm away from the upper edge of the shield.

6. The one-way perspective multifunctional law enforcement shield according to claim 1 is characterized in that: The flashing warning lights include: a GaN-based high-brightness LED light source with a brightness of 6500-7000 lumens per light; a pulse drive circuit with a dimming range of 10-100% and a strobe frequency of 0.5-30Hz; and a high thermal conductivity aluminum alloy heat dissipation system with a thermal resistance of ≤0.5℃ / W; there are a total of 5 warning lights, which are arranged at the four corners and the center of the front of the shield in a "M" shape with a spacing of 400-450mm.

7. The one-way perspective multifunctional law enforcement shield according to claim 1 is characterized in that: The quick-detachable arm-shield interface includes: a high-strength aviation-grade aluminum alloy base with a tensile strength of ≥570MPa; a titanium alloy snap-on component with a tensile strength of ≥900MPa; a thermoplastic polyurethane elastomer buffer pad with a hardness of 85-95ShoreA; and a spring-assisted double locking mechanism with a locking strength that can withstand a shear force of ≥800N without failure; wherein, the arm-shield interface is installed in the lower central area on the inner side of the shield and is fixed with 12-point bolts with a minimum pull-out force of ≥2000N.

8. The one-way perspective multifunctional law enforcement shield according to claim 1 is characterized in that: The structural parameters of the double-curvature impact-resistant shell include: central area thickness 8-10mm, edge area thickness 10-12mm, handle connection area thickness 12-15mm; primary curvature radius 1200-1500mm, secondary curvature radius 800-1000mm; shield body surface density 4.0-4.5kg / m 2 , the total weight of the system is ≤7.0kg; the rib layout is a multi-directional rib grid structure, the main rib height is 8-10mm, the width is 5-7mm, the spacing is 150-200mm, the secondary rib height is 5-7mm, the width is 3-5mm, and the spacing is 80-120mm.

9. The one-way perspective multifunctional law enforcement shield according to claim 1 is characterized in that: The ergonomic handle system includes: a high-strength aluminum alloy frame with an anodized surface; a thermoplastic elastomer gripping part with a hardness of 60-70 ShoreA; an anti-slip coating of a silicone and EPDM blend material with a hardness of 45-55 ShoreA; and an adjustment system with an adjustable angle of 0-30°, 7 locking positions, and an adjustable height of ±50mm, and 5 locking positions; wherein the gripping part has a length of 120-140mm, a diameter of 30-35mm, an elliptical cross-section, a micro-textured anti-slip surface, and a friction coefficient ≥0.

8.

10. A method for preparing the one-way perspective multifunctional law enforcement shield according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: (1) preparing a modified PC material, first drying a base PC resin at a temperature of 120±5°C for 4-6 hours; then mixing all additives uniformly; then using a blending twin-screw extruder for melt blending, with a feed zone temperature of 210-230°C, a compression zone temperature of 240-260°C, a metering zone temperature of 260-280°C, a die head temperature of 250-270°C, and a screw speed of 150-200 rpm; finally cooling in a water bath and granulating; (2) preparing a microprism array structure, first drying a PMMA resin at a temperature of 80±5°C for 3 hours; then mixing all additives uniformly; then using a blending twin-screw extruder for melt blending, with a feed zone temperature of 210-230°C, a compression zone temperature of 240-260°C, a metering zone temperature of 260-280°C, a die head temperature of 250-270°C, and a screw speed of 150-200 rpm; finally cooling in a water bath and granulating; -4 hours; then add the formula components and mix them evenly; then use a precision hot pressing machine to perform hot pressing molding at a temperature of 160-180°C and a pressure of 10-15MPa; then use a laser micromachining system to perform microstructural processing; finally, perform plasma surface activation and hard coating treatment; (3) Prepare Ag-TiO2 composite optical film, first prepare silver nanoparticle sol; then prepare TiO2 sol; then mix the two sols to form Ag-TiO2 composite sol; then use a multi-target magnetron sputtering system to perform multilayer film deposition; finally, vacuum anneal and cool at 200-250°C; (4) One-way perspective system assembly, assembling the microprism array structure and Ag-TiO2 composite optical film between PC sheets according to the designed structure and fixing them with optical-grade adhesives; (5) Integration of functional modules, including installation of law enforcement recorders, flashing police light systems, and quick-release arm shield interfaces; (6) Installation of electrical systems, including battery systems, cable layouts, and control panels; (7) Structural optimization and assembly, including assembly of a hyperbolic impact-resistant shell and ergonomic handle system; and (8) System testing and quality control, conducting comprehensive tests on the electrical system, optical system, and mechanical strength.

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