A double-layer photosensitive ink two-dimensional code anti-counterfeiting structure and an anti-counterfeiting verification method

Abstract

This invention relates to the fields of QR code anti-counterfeiting, invisible ink printing, and anti-counterfeiting technology for commodity packaging. Specifically, it relates to a dual-layer photosensitive ink QR code anti-counterfeiting structure and anti-counterfeiting verification method. The anti-counterfeiting structure consists of three layers stacked from top to bottom: a top anti-counterfeiting QR code layer, a middle photosensitive shielding layer, and a bottom basic QR code layer. The bottom layer is directly printed on the surface of the commodity packaging substrate. The middle layer is printed with a first photosensitive ink, and the top layer is printed with a second photosensitive ink. The first and second photosensitive inks are ultraviolet photosensitive invisible inks that respond to the same specific frequency. After color development, they form a high contrast and appear transparent and invisible under natural light or ordinary visible light. The bottom layer is completely exposed for identification. Under ultraviolet light of a specific frequency, the middle layer completely shields the bottom layer, and only the top layer is fully exposed. A unique association and binding relationship is pre-established between the bottom and top layers for cross-verification using dual codes. This achieves the dual effects of convenient basic verification and high-level anti-counterfeiting verification, eliminating the vulnerabilities of traditional anti-counterfeiting methods.

Description

Technical Field

[0001] This invention relates to the fields of QR code anti-counterfeiting, invisible ink printing, and anti-counterfeiting technology for commodity packaging, specifically to a double-layer photosensitive ink QR code anti-counterfeiting structure and anti-counterfeiting verification method. Background Technology

[0002] Currently, QR code anti-counterfeiting technology for product packaging is widely used in various commodity sectors such as food, daily necessities, tobacco and alcohol, luxury goods, and medical devices. The mainstream anti-counterfeiting method is to directly print publicly visible anti-counterfeiting QR codes on the packaging surface, allowing consumers to scan the code to verify the authenticity of the product. However, existing technologies have significant drawbacks: First, the QR codes are publicly visible, making them extremely easy for criminals to photograph, replicate, mass-produce, and forge, resulting in a very low anti-counterfeiting threshold and rendering the anti-counterfeiting effect virtually nonexistent. Second, the simple structure of a single, visible QR code lacks hidden anti-counterfeiting layers, making it impossible to distinguish between genuine original markings and counterfeit markings. Third, some invisible QR code anti-counterfeiting technologies use only a single layer of invisible ink printing, which is easily affected by light and environmental factors, and its simple structure makes it easy to crack and imitate.

[0003] Existing invisible anti-counterfeiting technologies are mostly single-layer, single-QR code structures with only a single verification mode. They are either publicly visible QR codes that are easily replicated and counterfeited, or fully invisible QR codes that cannot be verified in a conventional and intuitive way. They lack a dual-mode switching mechanism of "normally visible basic verification + ultraviolet exclusive advanced verification" and lack the ability to cross-verify two-layer QR codes. Their anti-counterfeiting verification logic is simplistic, making them extremely easy for criminals to crack by tampering with single-code data and replicating single-code patterns. They cannot meet the needs of the public for convenient verification and high-end exclusive anti-counterfeiting authentication.

[0004] To address the issues of existing technologies having a single verification mode, fixed anti-counterfeiting layers, ease of cracking, and an inability to balance practicality and security, there is an urgent need for a dual-mode switching dual-layer photosensitive QR code anti-counterfeiting solution. This solution would utilize a switching structure between a normally exposed bottom code and an ultraviolet-revealed top code, coupled with a dual-code association and mutual verification design, to balance convenient user verification with high-level anti-counterfeiting protection. Summary of the Invention

[0005] To overcome the aforementioned technical problems in the prior art, this invention provides a dual-layer photosensitive ink QR code anti-counterfeiting structure and anti-counterfeiting verification method. It adopts a dual-mode switching structure that displays the bottom layer QR code under normal visible light and switches to display the top layer anti-counterfeiting QR code under ultraviolet light. Combined with the dual-layer QR code associated bidirectional verification design, it achieves the dual effect of convenient basic verification for ordinary users and high-level anti-counterfeiting verification in professional scenarios, eliminating various cracking vulnerabilities of traditional single-layer QR code anti-counterfeiting.

[0006] To achieve the above objectives, embodiments of the present invention provide a dual-layer photosensitive ink QR code anti-counterfeiting structure, disposed on the surface of product packaging, comprising: a bottom basic QR code, fixedly disposed in a preset anti-counterfeiting area of ​​the product packaging; a middle photosensitive shielding layer, printed with a first photosensitive ink, completely covering the surface of the bottom basic QR code; and a top anti-counterfeiting QR code layer, printed with a second photosensitive ink, fixedly disposed on the outer surface of the middle photosensitive shielding layer, forming a stacked structure from bottom to top; both the first and second photosensitive inks are ultraviolet photosensitive invisible inks, and respond to the same preset specific frequency of ultraviolet light source, exhibiting transparency under natural light or ordinary visible light environments. In its invisible state, with no obstruction and no pattern display, the underlying basic QR code is fully exposed for scanning devices to perform basic anti-counterfeiting verification. Under ultraviolet light of a preset specific frequency, the middle photosensitive shielding layer and the top anti-counterfeiting QR code layer simultaneously develop color, and the colors after development form a high-contrast effect that allows scanning devices to normally recognize the code. After development, the middle photosensitive shielding layer completely obscures the underlying basic QR code, leaving only the top anti-counterfeiting QR code layer displaying a complete and identifiable anti-counterfeiting QR code pattern. The QR code data corresponding to the underlying basic QR code and the top anti-counterfeiting QR code layer are pre-established with a unique association and binding relationship for cross-verification of the two codes to perform advanced anti-counterfeiting verification.

[0007] Preferably, the color contrast between the first photosensitive ink and the second photosensitive ink after color development is ≥80%, and there is no color overlap or pattern interference after color development, ensuring that the QR code pattern presented by the top anti-counterfeiting QR code layer is complete and clear.

[0008] Preferably, the color system after the first photosensitive ink is developed is a cool color system, and the color system after the second photosensitive ink is developed is a warm color system, and the color contrast after the two are developed is greater than or equal to 80%.

[0009] Preferably, the coverage area of ​​the middle photosensitive shielding layer is greater than or equal to the pattern area of ​​the bottom basic QR code, and completely covers the entire pattern area of ​​the bottom basic QR code without any exposed patterns; the outline size of the top anti-counterfeiting QR code layer is completely matched with the outline size of the middle photosensitive shielding layer, and the top anti-counterfeiting QR code layer completely covers the middle photosensitive shielding layer, with regular boundaries of the anti-counterfeiting area.

[0010] Preferably, the unique association binding relationship is pre-established through a cloud-based anti-counterfeiting system. The unique association binding relationship is stored in the anti-counterfeiting system in the form of an association key pair for uniqueness matching verification during the dual-code cross-verification.

[0011] Preferably, both the first photosensitive ink and the second photosensitive ink have the properties of being resistant to friction, oxidation, and light aging, so as to be suitable for the entire process of product packaging, warehousing, transportation, and sales.

[0012] Accordingly, the present invention also provides a dual-layer photosensitive ink QR code anti-counterfeiting verification method, applied to the dual-layer photosensitive ink QR code anti-counterfeiting structure provided by the present invention, comprising the following steps: S1: Anti-counterfeiting trigger, using a preset ultraviolet light source of a specific frequency to irradiate the QR code anti-counterfeiting area on the product packaging; S2: Pattern color development. Under the ultraviolet light, the first photosensitive ink of the middle photosensitive shielding layer and the second photosensitive ink of the top anti-counterfeiting QR code layer are synchronously triggered to develop color, and the high contrast colors of the two layers of ink are used to present a clear and complete top anti-counterfeiting QR code pattern. S3: Hierarchical scanning verification. Under natural light or ordinary visible light, the underlying basic QR code is directly scanned to complete the basic anti-counterfeiting verification of the product. Under ultraviolet irradiation, the underlying basic QR code is completely blocked by the color-developing middle photosensitive blocking layer, and only the anti-counterfeiting QR code presented by the top anti-counterfeiting QR code layer can be identified. The system retrieves the pre-stored association binding data between the top anti-counterfeiting QR code and the underlying basic QR code, performs cross-comparison and two-way verification to complete the advanced anti-counterfeiting verification. S4: State restoration. After the ultraviolet light source is removed, the first photosensitive ink and the second photosensitive ink quickly fade and return to a transparent and invisible state. The anti-counterfeiting area returns to a patternless and invisible state with no residual color.

[0013] Preferably, under normal visible light conditions, the underlying basic QR code is fully exposed for direct scanning verification; under the specific frequency of ultraviolet irradiation, the middle photosensitive shielding layer completely blocks the underlying basic QR code, and only the top anti-counterfeiting QR code layer is effectively identifiable, realizing dual-mode scanning verification.

[0014] Preferably, in step S3, the cross-comparison and two-way verification at least include: verifying whether the top-level anti-counterfeiting QR code and the bottom-level basic QR code satisfy a preset unique association key matching relationship, and determining that the product is genuine only when the match is consistent.

[0015] The present invention has at least the following technical effects through the technical solution provided by the present invention: This invention employs a double-layer photosensitive stacked structure, with a bottom layer for shielding and a top layer for anti-counterfeiting. Unlike traditional single-layer QR code anti-counterfeiting structures, this design prevents counterfeiters from using conventional methods such as copying, photographing, or photocopying. The dual-layer exclusive photosensitive ink matching and specific UV triggering create a double barrier, significantly raising the barrier to counterfeiting and achieving a high level of anti-counterfeiting sophistication. Its unique mode adapts to all verification scenarios. This invention pioneers a dual-mode anti-counterfeiting switching logic, unlike traditional single-layer fixed display / fixed invisible QR codes. The bottom layer is displayed under normal light for basic verification by ordinary consumers, while UV-exclusive irradiation switches to the top layer anti-counterfeiting code for advanced verification. This balances user convenience with professional anti-counterfeiting security, adapting to different verification scenarios. The requirements are: high contrast dual-layer ink color development with no pattern interference; clear and neat QR code pattern after UV triggering; fast recognition by mobile phones and various dedicated scanning devices; high verification efficiency and low error tolerance; accurate recognition and good stability; the overall structure can be mass-produced using conventional packaging printing processes without modifying existing production lines; compatible with various commodity packaging substrates such as paper, plastic, laminated, and metal film; cost controllable; suitable for large-scale promotion and application; and can be repeatedly verified by UV triggering. After removing the light source, it quickly returns to an invisible state without leaving any traces or residues, without affecting the appearance and texture of the commodity packaging or damaging the overall packaging design. This allows for repeated verification without residue. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the cross-sectional structure of the anti-counterfeiting structure provided by the present invention under normal visible light conditions; Figure 2 This is a schematic diagram of the cross-sectional structure of the anti-counterfeiting structure provided by the present invention under ultraviolet irradiation at a specific frequency. Figure 3 This is a schematic diagram of the dual-code association anti-counterfeiting verification process of the present invention.

[0017] Icons: 1. Product packaging base material; 2. Bottom layer basic QR code; 3. Middle layer photosensitive shielding layer; 4. Top layer anti-counterfeiting QR code layer. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0019] In this invention, the terms "system" and "network" are used interchangeably. "Multiple" refers to two or more; therefore, in this invention, "multiple" can also be understood as "at least two." "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, it should be understood that in the description of this invention, terms such as "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or order.

[0020] This invention provides a dual-layer photosensitive ink QR code anti-counterfeiting structure, disposed on the surface of product packaging, comprising: a bottom basic QR code, fixedly disposed in a preset anti-counterfeiting area of ​​the product packaging; a middle photosensitive shielding layer, printed with a first photosensitive ink, completely covering the surface of the bottom basic QR code; and a top anti-counterfeiting QR code layer, printed with a second photosensitive ink, fixedly disposed on the outer surface of the middle photosensitive shielding layer, forming a stacked structure from bottom to top; both the first and second photosensitive inks are ultraviolet photosensitive invisible inks, and respond to the same preset specific frequency of ultraviolet light source, remaining transparent and invisible under natural light or ordinary visible light environments. The bottom-layer basic QR code is fully exposed without any obstruction or pattern display, allowing scanning devices to identify and perform basic anti-counterfeiting verification. Under ultraviolet light of a preset specific frequency, the middle photosensitive shielding layer and the top anti-counterfeiting QR code layer develop colors synchronously, and the colors they produce create a high-contrast effect that allows scanning devices to recognize them normally. The middle photosensitive shielding layer completely obscures the bottom-layer basic QR code, leaving only the top anti-counterfeiting QR code layer displaying a complete and identifiable anti-counterfeiting QR code pattern. The QR code data corresponding to the bottom-layer basic QR code and the top anti-counterfeiting QR code layer are pre-established with a unique association and binding relationship for cross-verification using dual codes to perform advanced anti-counterfeiting verification.

[0021] In this invention, the provided dual-layer photosensitive ink QR code anti-counterfeiting structure is integrated into the pre-set anti-counterfeiting area of ​​the product packaging. The core consists of three overlapping layers: a top anti-counterfeiting QR code layer, a middle photosensitive shielding layer, and a bottom basic QR code. The bottom basic QR code is directly printed on the surface of the product packaging substrate, serving as the main structure for conventional verification. The middle photosensitive shielding layer is fully covered by a first ultraviolet photosensitive invisible ink printed on the surface of the bottom basic QR code. The top anti-counterfeiting QR code layer is printed with a second ultraviolet photosensitive invisible ink on the outside of the middle photosensitive shielding layer, forming a stacked structure. Both layers of photosensitive ink are transparent and colorless under normal natural light, with no obstruction or pattern display. The bottom basic QR code is fully exposed, allowing consumers to directly scan the code to complete basic anti-counterfeiting verification. Figure 1 As shown in the diagram, the anti-counterfeiting structure of the present invention has a layered cross-sectional structure under normal visible light conditions. The bottom basic QR code 2 is printed on the surface of the product packaging substrate 1. The middle photosensitive shielding layer 3 fully covers and adheres to the surface of the bottom basic QR code 2. The top anti-counterfeiting QR code layer 4 is superimposed on the outside of the middle photosensitive shielding layer 3. Under normal visible light, both the middle photosensitive shielding layer 3 and the top anti-counterfeiting QR code layer 4 are transparent and invisible, without any shielding effect, and the bottom basic QR code 2 is fully exposed. The first and second photosensitive inks are exclusive co-frequency ultraviolet-responsive inks, responding to the same preset specific frequency ultraviolet light source. They only trigger color development under specific frequency ultraviolet irradiation and are transparent and invisible under normal natural light or visible light conditions, without shielding or pattern display. Under ultraviolet light of a specific frequency, the middle photosensitive blocking layer and the top anti-counterfeiting QR code layer develop colors synchronously, and the colors after development by the two inks form a high-contrast effect that allows for normal recognition by scanning devices, with no color fusion or pattern interference; the developed middle blocking layer can completely cover the underlying basic QR code, leaving only the top anti-counterfeiting QR code layer to display a complete and identifiable anti-counterfeiting QR code pattern, meeting the requirements for scanning accuracy. Figure 2 As shown in the figure, the anti-counterfeiting structure of the present invention is a layered cross-sectional structure under ultraviolet light irradiation at a specific frequency. After ultraviolet light is triggered, the middle photosensitive shielding layer 3 and the top anti-counterfeiting QR code layer 4 are simultaneously colored. After the color is developed, the middle photosensitive shielding layer 3 completely covers the bottom basic QR code 2, making the bottom QR code invisible. Only the top anti-counterfeiting QR code layer 4 is exposed, forming an anti-counterfeiting pattern structure that can be scanned and identified.

[0022] In one implementation, the first photosensitive ink has a cool color system (such as blue or purple), while the second photosensitive ink has a warm color system (such as red or orange), and the color contrast between the two is ≥80% to minimize the problems of pattern blurring and recognition failure. Furthermore, the first and second photosensitive inks can be selected as photosensitive invisible inks that respond to 365nm or 395nm ultraviolet light. This wavelength is rarely seen in conventional civilian use, effectively preventing accidental triggering by everyday light and ensuring the concealment of the anti-counterfeiting label. For example, if a 365nm ordinary civilian UV fluorescent ink is selected, this... The first and second photosensitive inks exhibit the brightest fluorescence peak when excited by 365nm±5nm ultraviolet light. Within the 285nm-400nm range, their fluorescence is relatively dim when excited by ultraviolet light of wavelengths other than 365nm±5nm. They also appear transparent and invisible when excited by ultraviolet light of wavelengths outside the 285nm-400nm range, similarly under natural light or ordinary visible light. In another embodiment, the first and second photosensitive inks can also be industrially customized narrow-band anti-counterfeiting inks, such as Ceres Colorless to Blue Narrow-365, a narrow-band 365nm dedicated anti-counterfeiting ink. In this case, the first and second photosensitive inks only exhibit the brightest fluorescence when excited by 365nm ultraviolet light, while remaining transparent and invisible when excited by ultraviolet light of other wavelengths, similarly under natural light or ordinary visible light. Furthermore, both the first and second photosensitive inks possess resistance to friction, oxidation, and light aging, making them suitable for the entire process of product packaging, warehousing, transportation, and sales, and ensuring long-term stability in both invisibility and color development.

[0023] In this invention, the coverage area of ​​the middle photosensitive shielding layer is greater than or equal to the pattern area of ​​the bottom basic QR code, and completely covers the entire pattern area of ​​the bottom basic QR code, with no local pattern exposure; and the outline size of the top anti-counterfeiting QR code layer is perfectly matched with the outline size of the middle photosensitive shielding layer, so that the top anti-counterfeiting QR code layer completely covers the middle photosensitive shielding layer, and the anti-counterfeiting area boundary is regular; thus, the middle photosensitive shielding layer is fully covered by the first ultraviolet photosensitive invisible ink printed on the surface of the bottom basic QR code, and the top anti-counterfeiting QR code layer is printed on the outside of the middle photosensitive shielding layer by the second ultraviolet photosensitive invisible ink, forming a stacked structure; both layers of photosensitive ink are transparent and colorless under normal natural light conditions, with no obstruction and no pattern display, and the bottom basic QR code is completely exposed, allowing consumers to directly scan the code to complete basic anti-counterfeiting verification.

[0024] In this invention, a unique association is pre-established between the underlying basic QR code and the top anti-counterfeiting QR code. This creates a uniquely associated pair of QR codes for cross-verification, enabling advanced anti-counterfeiting verification. This forms a dual-layer anti-counterfeiting system of "conventional single-code basic verification + ultraviolet dual-code advanced mutual verification," distinct from traditional single-layer invisible QR code anti-counterfeiting structures. The underlying basic QR code and the top anti-counterfeiting QR code are pre-entered into the anti-counterfeiting system, establishing a unique one-to-one association key. For example, a unique association between the underlying basic QR code and the top anti-counterfeiting QR code is pre-established through a cloud-based anti-counterfeiting system. This unique association is stored in the cloud-based anti-counterfeiting system as an association key pair, used for unique matching verification during cross-verification. The two QR code data are interconnected and cross-verified, achieving both basic and advanced verification for dual anti-counterfeiting effects, completely avoiding the vulnerability of traditional single-layer single-code anti-counterfeiting systems.

[0025] Based on the same inventive concept, this invention provides a dual-layer photosensitive ink QR code anti-counterfeiting verification method, applied to the dual-layer photosensitive ink QR code anti-counterfeiting structure provided by this invention, including the following steps: S1: Anti-counterfeiting trigger, using a preset ultraviolet light source of a specific frequency to irradiate the QR code anti-counterfeiting area on the product packaging; S2: Pattern color development. Under the ultraviolet light, the first photosensitive ink of the middle photosensitive shielding layer and the second photosensitive ink of the top anti-counterfeiting QR code layer are synchronously triggered to develop color, and the high contrast colors of the two layers of ink are used to present a clear and complete top anti-counterfeiting QR code pattern. S3: Hierarchical scanning verification. Under natural light or ordinary visible light, the underlying basic QR code is directly scanned to complete the basic anti-counterfeiting verification of the product. Under ultraviolet irradiation, the underlying basic QR code is completely blocked by the color-developing middle photosensitive blocking layer, and only the anti-counterfeiting QR code presented by the top anti-counterfeiting QR code layer can be identified. The system retrieves the pre-stored association binding data between the top anti-counterfeiting QR code and the underlying basic QR code, performs cross-comparison and two-way verification to complete the advanced anti-counterfeiting verification. S4: State restoration. After the ultraviolet light source is removed, the first photosensitive ink and the second photosensitive ink quickly fade and return to a transparent and invisible state. The anti-counterfeiting area returns to a patternless and invisible state with no residual color.

[0026] Specifically, this verification method relies on a dual-mode switching layered structure and a dual-code association and mutual verification system to achieve hierarchical anti-counterfeiting verification. Under normal visible light conditions, the bottom basic QR code is fully exposed for direct scanning verification, meeting the public's need for convenient verification. Under specific frequency ultraviolet irradiation (e.g., triggered by 365nm or 395nm ultraviolet light), it switches to a higher-level verification using the top anti-counterfeiting QR code. The middle photosensitive shielding layer completely obscures the bottom basic QR code, leaving only the top anti-counterfeiting QR code layer effectively identifiable. Accurate authenticity is determined by cross-comparison of the dual-code data. Step S3 specifically verifies whether the top anti-counterfeiting QR code and the bottom basic QR code meet the preset unique association key matching relationship. Only when they match is the product determined to be genuine. After removing the light source, it automatically returns to its transparent state, reverting to the exposed bottom QR code state. The anti-counterfeiting security and practicality far exceed traditional single-layer QR code anti-counterfeiting technology, achieving dual-mode scanning switching verification. Figure 3 As shown in the diagram, this invention illustrates the dual-code association anti-counterfeiting verification process. The bottom-level basic QR code and the top-level anti-counterfeiting QR code are pre-established with a unique association in the cloud-based anti-counterfeiting system. Under normal conditions, scanning the bottom-level QR code completes the verification of basic product information. After ultraviolet excitation, scanning the top-level anti-counterfeiting QR code causes the system to automatically retrieve the binding data of the bottom-level QR code, complete the cross-comparison of the two codes, and perform two-way verification. If the two codes match, the product is determined to be genuine, thus achieving graded dual anti-counterfeiting verification.

[0027] Example 1: Preparation of a double-layer photosensitive QR code anti-counterfeiting structure Step 1, Substrate Pretreatment: Select a conventional laminated paper substrate for product packaging, clean the anti-counterfeiting printing area, and wipe the surface with anhydrous ethanol to remove oil and dust, ensuring that the surface is flat, free of stains and dust, and meets the printing process requirements; for other types of packaging substrates such as plastic and metal film, appropriate cleaning agents and cleaning methods can be selected according to the characteristics of the substrate to ensure that the surface tension of the printing area meets the ink adhesion requirements.

[0028] Step 2: Printing the Base QR Code: Using conventional environmentally friendly printing inks (such as water-based inks or UV-cured inks), print a standard square QR code in the pre-designed anti-counterfeiting area as the base structure. The QR code size should be adapted to standard barcode scanning specifications, preferably 15mm×15mm to 25mm×25mm. Printing methods can include offset printing, flexographic printing, or digital inkjet printing. The printing resolution should be no less than 300 DPI to ensure the QR code is clear and has sharp edges, meeting the recognition accuracy requirements of scanning devices. After printing, perform appropriate drying and curing treatment (hot air drying or UV curing) according to the ink type to ensure the base QR code adheres firmly to the substrate surface.

[0029] Step 3: Printing the intermediate photosensitive shielding layer: Using 365nm UV-responsive blue photosensitive invisible ink (first photosensitive ink), it is fully printed on the surface of the underlying QR code. The preferred printing method is screen printing or flexographic printing. The coating thickness is uniform, ensuring that the coating is uniform, free of bubbles and pinholes, and completely covers all pattern areas of the underlying QR code without any exposed areas. The first photosensitive ink is transparent and colorless under normal natural and visible light environments and is invisible to the naked eye. It only triggers color development when exposed to 365nm wavelength ultraviolet light, forming a uniform blue shielding layer. After printing, a low-temperature drying and curing process is used (temperature controlled between 40℃ and 60℃, time 3 to 5 minutes) to ensure that the ink coating adheres firmly to the substrate, is abrasion resistant, and does not easily peel off.

[0030] Step 4: Printing the Top-Level Anti-counterfeiting QR Code Layer: Using a 365nm UV-responsive red photosensitive invisible ink (second photosensitive ink), a standard anti-counterfeiting QR code is printed on the surface of the middle shielding layer. The second photosensitive ink is transparent and colorless under normal natural and visible light conditions, but develops a red color under 365nm ultraviolet light, creating a high contrast with the blue color of the first photosensitive ink (color contrast not less than 80%). The outline size of the top-level anti-counterfeiting QR code perfectly matches the outline size of the middle photosensitive shielding layer, and the top-level anti-counterfeiting QR code layer completely covers the middle photosensitive shielding layer, with neat overall layer boundaries. The printing precision is not less than 300 DPI, ensuring clear, misaligned, and complete QR code pattern boundaries. After printing, a low-temperature drying and curing process is used for further processing.

[0031] Step 5, Curing Treatment: After the double-layer photosensitive ink printing is completed, the entire structure undergoes final curing treatment. The curing temperature is controlled between 45℃ and 55℃, and the time is 5 to 10 minutes. A low-temperature drying curing process is used to ensure that both ink coatings are fully cured, firmly adhere to the substrate, are abrasion-resistant, and not easily peeled off, thus completing the anti-counterfeiting structure preparation. Quality inspection is carried out after curing. (1) Inspection under normal visible light: There should be no visible patterns or color difference in the anti-counterfeiting area, the double-layer photosensitive coating should be completely invisible, and the appearance should be consistent with the packaging substrate; (2) Ultraviolet trigger test: The anti-counterfeiting area is irradiated with a preset ultraviolet light source of a specific frequency. The middle layer of the shielding layer and the top layer of the anti-counterfeiting QR code should be colored synchronously. The middle layer completely covers the bottom layer of the QR code, and only the top layer of the anti-counterfeiting QR code is clearly visible. The pattern is complete, without defects, and without color overlap. (3) Scanning and identification verification: Under ultraviolet irradiation, use a mobile phone or a dedicated scanning device to scan the top anti-counterfeiting QR code. It should be able to be recognized normally and jump to the anti-counterfeiting verification page.

[0032] After passing the inspection, the anti-counterfeiting structure is prepared.

[0033] Example 2: Anti-counterfeiting verification operation process 2.1 Observation under normal conditions: Under normal visible light environments such as natural light and indoor lighting, the anti-counterfeiting area of ​​the product packaging has no visible patterns. The double-layer photosensitive coating is completely transparent and invisible, maintaining the same appearance as the packaging substrate and not compromising the overall aesthetic design of the packaging. Consumers cannot determine the presence or absence of the anti-counterfeiting area with the naked eye, ensuring the concealment of the anti-counterfeiting label.

[0034] 2.2 Standard Verification: Under normal natural and indoor lighting conditions, the double-layer photosensitive coating is completely transparent and invisible, with no obstruction. The underlying QR code is clearly displayed in the anti-counterfeiting area of ​​the packaging. Consumers can directly scan the underlying QR code with their mobile phones (WeChat, Alipay, or other apps with scanning functions) to be redirected to the anti-counterfeiting verification page to complete the verification of basic product information and basic anti-counterfeiting measures. This mode is convenient to operate, requires no special tools, and meets the daily verification needs of ordinary consumers.

[0035] 2.3 UV Trigger Switching and Dual-Code Advanced Verification: A 365nm dedicated UV flashlight is used to vertically illuminate the anti-counterfeiting area at a distance of 5cm to 15cm for 1 to 3 seconds. Under UV illumination, the middle blue shielding layer (first photosensitive ink, blue) and the top red anti-counterfeiting QR code (second photosensitive ink, red) develop colors simultaneously. The colors after development create a high-contrast effect (contrast ratio ≥ 80%), with no color overlap or pattern interference. The developed middle shielding layer completely obscures the underlying basic QR code, making the underlying QR code invisible. Only a high-contrast, clear, and complete image is displayed within the area. The top-level anti-counterfeiting QR code pattern is used to scan and identify it using a mobile phone or dedicated scanning device. After scanning, the dedicated anti-counterfeiting system automatically retrieves the pre-stored association binding data between the top-level anti-counterfeiting QR code and the bottom-level basic QR code (stored in the cloud anti-counterfeiting system in the form of association key pairs), performs cross-comparison and two-way verification. The verification logic is as follows: it verifies whether the top-level anti-counterfeiting QR code and the bottom-level basic QR code meet the preset unique association key matching relationship. Only when the two codes match is the product determined to be genuine; if the two codes do not match or either code cannot be recognized, the product is determined to be counterfeit. This mode achieves high-precision and high-level authenticity verification, suitable for professional anti-counterfeiting inspection, high-end product verification, and other scenarios.

[0036] 2.4 State Restoration: After the ultraviolet light source is removed, the double-layer photosensitive coating automatically fades within 3-10 seconds, restoring to a transparent and invisible state, with no color residue on the packaging surface. The anti-counterfeiting area returns to a patternless and invisible state, and the underlying basic QR code is fully exposed again, ready for the next routine scanning verification. The structure of this invention can repeatedly undergo ultraviolet-triggered color development and fading restoration cycles without performance degradation, and does not affect repeated verification use.

[0037] Example 3: Construction and operation of the dual-code association anti-counterfeiting system, illustrating the construction and operation of the dual-code association anti-counterfeiting verification system upon which this invention relies. 3.1 The dual-code anti-counterfeiting system consists of the following modules: (1) QR code generation module: Generate a unique pair of bottom basic QR code and top anti-counterfeiting QR code for each product. The two QR codes establish a one-to-one correspondence at the algorithm level and generate a unique association key pair.

[0038] (2) Database storage module: The associated key pair of the paired QR code and the product information (production batch, date, sales area, etc.) are encrypted and stored in the cloud anti-counterfeiting database.

[0039] (3) QR code verification module: Receives front-end QR code scanning requests, parses QR code data, retrieves related information from the database to perform cross-comparison and two-way verification.

[0040] (4) Verification result feedback module: Returns the verification result (genuine / counterfeit) and related product traceability information to the user.

[0041] 3.2 Generation and binding of association key pairs: For each product, the system generates and binds a dual-code association key pair according to the following process: (1) Generate underlying basic QR code data: including the product's unique serial number (such as SN code) and basic verification information; (2) Generate top-level anti-counterfeiting QR code data: containing the associated verification code corresponding to the bottom-level QR code, which is generated by the bottom-level QR code data through an encryption algorithm (such as AES-256); (3) Upload the association key pair between the bottom QR code data and the top QR code data to the cloud anti-counterfeiting system database to establish a unique binding relationship; (4) Print the bottom basic QR code and the top anti-counterfeiting QR code on the corresponding layers of the product packaging.

[0042] 3.3 Verification Process (1) Basic verification: The user scans the underlying basic QR code, and the system returns the basic information of the product (production date, batch, etc.) to complete the first-level verification.

[0043] (2) Advanced verification: Under ultraviolet light, the top anti-counterfeiting QR code is scanned. The system automatically retrieves the associated key pair corresponding to the top QR code and queries the underlying QR code data bound to it. The system compares whether the currently scanned top QR code data and the underlying QR code data meet the preset associated key matching relationship. Only when the match is consistent, the product is determined to be genuine.

[0044] (3) Verification records: Each verification operation is recorded in the system, including verification time, verification method (basic / advanced), verification results, etc., which facilitates subsequent traceability and auditing.

[0045] 3.4 Security Guarantee (1) The associated key pair is stored in encrypted form to prevent the key from being stolen due to database leakage; (2) Each QR code is unique. When the same QR code is scanned multiple times, the system can record the number of scans and the location. If abnormal repeated scanning is detected, an early warning can be triggered. (3) The verification logic of the dual code association is executed on the server side, and the front end only submits the scanned data to prevent the verification logic from being reverse-engineered.

[0046] The dual-layer photosensitive ink QR code anti-counterfeiting structure and verification method provided by this invention can be mass-produced using conventional packaging printing processes without requiring large-scale modifications to existing production lines. The photosensitive ink used can utilize a mature ultraviolet fluorescent ink technology system, with widely available raw materials and controllable costs. This invention is compatible with various commodity packaging substrates such as paper, plastic, laminated, and metallic films, and can be widely applied in the anti-counterfeiting packaging of various commodities including food, daily chemicals, tobacco and alcohol, luxury goods, and medical devices, demonstrating excellent industrial practicality and prospects for large-scale promotion and application.

[0047] This invention employs a double-layer photosensitive stacked structure, with a bottom layer for shielding and a top layer for anti-counterfeiting. Unlike traditional single-layer QR code anti-counterfeiting structures, this design prevents counterfeiters from using conventional methods such as copying, photographing, or photocopying. The dual-layer exclusive photosensitive ink matching and specific UV triggering create a double barrier, significantly raising the barrier to counterfeiting and achieving a high level of anti-counterfeiting sophistication. Its unique mode adapts to all verification scenarios. This invention pioneers a dual-mode anti-counterfeiting switching logic, unlike traditional single-layer fixed display / fixed invisible QR codes. The bottom layer is displayed under normal light for basic verification by ordinary consumers, while UV-exclusive irradiation switches to the top layer anti-counterfeiting code for advanced verification. This balances user convenience with professional anti-counterfeiting security, adapting to different verification scenarios. The requirements are: high contrast dual-layer ink color development with no pattern interference; clear and neat QR code pattern after UV triggering; fast recognition by mobile phones and various dedicated scanning devices; high verification efficiency and low error tolerance; accurate recognition and good stability; the overall structure can be mass-produced using conventional packaging printing processes without modifying existing production lines; compatible with various commodity packaging substrates such as paper, plastic, laminated, and metal film; cost controllable; suitable for large-scale promotion and application; and can be repeatedly verified by UV triggering. After removing the light source, it quickly returns to an invisible state without leaving any traces or residues, without affecting the appearance and texture of the commodity packaging or damaging the overall packaging design. This allows for repeated verification without residue.

[0048] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0049] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0050] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0051] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A double-layer photosensitive ink two-dimensional code anti-counterfeiting structure arranged on a surface of a commodity package, characterized in that, include: The basic QR code is fixedly placed in the pre-designed anti-counterfeiting area of ​​the product packaging; The middle photosensitive shielding layer is printed with the first photosensitive ink and completely covers the surface of the underlying base QR code; The top anti-counterfeiting QR code layer is printed with a second photosensitive ink and fixedly set on the outer surface of the middle photosensitive shielding layer, forming a stacked structure from bottom to top. Both the first and second photosensitive inks are ultraviolet photosensitive invisible inks, and they respond to the same preset specific frequency of ultraviolet light source. They are transparent and invisible in natural light or ordinary visible light environments, without obstruction or pattern display. The bottom basic QR code is fully exposed for scanning devices to identify and perform basic anti-counterfeiting verification. Under the preset specific frequency of ultraviolet light, the middle photosensitive shielding layer and the top anti-counterfeiting QR code layer develop colors synchronously, and the colors after development form a high-contrast effect that can be normally identified by scanning devices. After development, the middle photosensitive shielding layer completely covers the bottom basic QR code, and only the top anti-counterfeiting QR code layer presents a complete and identifiable anti-counterfeiting QR code pattern. The underlying basic QR code and the QR code data corresponding to the top anti-counterfeiting QR code layer are pre-established with a unique association and binding relationship for cross-verification of the two codes to perform advanced anti-counterfeiting verification.

2. The dual-layer photosensitive ink two-dimensional code security structure according to claim 1, characterized in that, The color contrast between the first photosensitive ink and the second photosensitive ink after color development is ≥80%, and there is no color overlap or pattern interference after color development, ensuring that the QR code pattern presented by the top anti-counterfeiting QR code layer is complete and clear.

3. The dual-layer photosensitive ink two-dimensional code security structure according to claim 2, characterized in that, The color system after the first photosensitive ink is developed is a cool color system, and the color system after the second photosensitive ink is developed is a warm color system. The color contrast between the two is greater than or equal to 80%.

4. The dual-layer photosensitive ink two-dimensional code security structure according to claim 1, characterized in that, The coverage area of ​​the middle photosensitive shielding layer is greater than or equal to the pattern area of ​​the bottom base QR code, and completely covers the entire pattern area of ​​the bottom base QR code with no local pattern exposure. The outline dimensions of the top anti-counterfeiting QR code layer are perfectly matched with the outline dimensions of the middle photosensitive blocking layer, and the top anti-counterfeiting QR code layer completely covers the middle photosensitive blocking layer, with regular boundaries of the anti-counterfeiting area.

5. The dual-layer photosensitive ink QR code anti-counterfeiting structure according to claim 1, characterized in that, The unique association binding relationship is pre-established through the cloud-based anti-counterfeiting system. The unique association binding relationship is stored in the anti-counterfeiting system in the form of an association key pair, which is used for unique matching verification during the dual-code cross-verification.

6. The dual-layer photosensitive ink QR code anti-counterfeiting structure according to claim 1, characterized in that, Both the first and second photosensitive inks possess resistance to friction, oxidation, and light aging, making them suitable for the entire process of product packaging, warehousing, transportation, and sales.

7. A method for verifying counterfeit-proof QR codes using dual-layer photosensitive ink, applied to the dual-layer photosensitive ink QR code anti-counterfeiting structure as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: Anti-counterfeiting trigger, using a preset ultraviolet light source of a specific frequency to irradiate the QR code anti-counterfeiting area on the product packaging; S2: Pattern color development. Under the ultraviolet light, the first photosensitive ink of the middle photosensitive shielding layer and the second photosensitive ink of the top anti-counterfeiting QR code layer are synchronously triggered to develop color, and the high contrast colors of the two layers of ink are used to present a clear and complete top anti-counterfeiting QR code pattern. S3: Hierarchical scanning verification. Under natural light or ordinary visible light, the underlying basic QR code is directly scanned to complete the basic anti-counterfeiting verification of the product. Under ultraviolet irradiation, the underlying basic QR code is completely blocked by the color-developing middle photosensitive blocking layer, and only the anti-counterfeiting QR code presented by the top anti-counterfeiting QR code layer can be identified. The system retrieves the pre-stored association binding data between the top anti-counterfeiting QR code and the underlying basic QR code, performs cross-comparison and two-way verification to complete the advanced anti-counterfeiting verification. S4: State restoration. After the ultraviolet light source is removed, the first photosensitive ink and the second photosensitive ink quickly fade and return to a transparent and invisible state. The anti-counterfeiting area returns to a patternless and invisible state with no residual color.

8. The dual-layer photosensitive ink QR code anti-counterfeiting verification method according to claim 7, characterized in that, Under normal visible light conditions, the underlying basic QR code is fully exposed for direct scanning verification; under ultraviolet irradiation at a specific frequency, the middle photosensitive shielding layer completely blocks the underlying basic QR code, and only the top anti-counterfeiting QR code layer is effectively identifiable, realizing dual-mode scanning verification.

9. The dual-layer photosensitive ink QR code anti-counterfeiting verification method according to claim 7, characterized in that, In S3, the cross-comparison and two-way verification include at least: verifying whether the top-level anti-counterfeiting QR code and the bottom-level basic QR code satisfy the preset unique association key matching relationship, and determining that the product is genuine only when the match is consistent.

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