Dual visual effect anti-counterfeiting packaging box

Abstract

The application provides a double visual effect anti-counterfeiting packaging box, which comprises a box body and a box cover. The back of the box body is provided with a hot stamping area, the hot stamping area is provided with a gold stamping foil, the gold stamping foil is embedded with a micro-text array, and the hot stamping area is recessed into the box body to form a groove. The box cover is provided with a windowed area, the windowed area is provided with a decoding sheet, and the side of the decoding sheet facing the box body is provided with a microlens array matched with the micro-text array. The periphery of the hot stamping area and the periphery of the windowed area are both provided with magnetic attraction assemblies. When the box cover is closed, the gold stamping foil is exposed on the back of the box body and presents a metallic luster. When the box cover is opened, the box cover is attached to the back of the box body through the magnetic attraction assemblies, the decoding sheet is embedded into the groove, the microlens array and the micro-text array are superimposed and single-point accurately aligned, and a moire magnified image is presented. The gold stamping foil embedded with the micro-text array is arranged on the back of the box body, the decoding sheet provided with the microlens array is arranged on the box cover, and the box cover is attached to the back of the box body to present a moire magnified image.

Description

Technical Field

[0001] This application relates to the field of anti-counterfeiting packaging boxes, and in particular to an anti-counterfeiting packaging box with dual visual effects. Background Technology

[0002] One of the mainstream 3D micro-nano anti-counterfeiting technologies is micro-focused moiré imaging technology. The most common type of micro-focused moiré imaging technology is the transmissive structure micro-focused moiré imaging technology. It is usually based on the precise alignment of two sides of an optically transparent substrate to create a microlens array and a micro-image array. The micro-image array should be located at or near the focal plane of the microlens array, and the two should be of similar size and period. The combination of the two produces a moiré magnification effect and a parallax displacement effect of human binocular vision, so as to achieve a visual effect of presenting a three-dimensional depth of field directly to the naked eye and with angular displacement.

[0003] Existing anti-counterfeiting packaging boxes using 3D micro-nano anti-counterfeiting technology have the following problems: 1) High production costs and difficulty in large-scale production; 2) Weak first-line anti-counterfeiting performance makes the packaging boxes easy to be counterfeited and unable to effectively protect the goods; 3) The single visual effect dimension affects the market appeal and anti-counterfeiting identification of the packaging boxes. Utility Model Content

[0004] In view of the aforementioned problems, this application is made to provide a dual-visual-effect anti-counterfeiting packaging box that overcomes or at least partially solves the aforementioned problems, comprising:

[0005] A dual-visual-effect anti-counterfeiting packaging box, comprising a box body and a box lid;

[0006] The back of the box has a hot stamping area, the hot stamping area has hot stamping foil, the hot stamping foil has a micro-graphic array embedded in it, and the hot stamping area is recessed into the box to form a groove.

[0007] The box cover has a window area, the window area has a decoding chip, and the side of the decoding chip facing the box body has a microlens array adapted to the micro-graphic array;

[0008] Magnetic components are provided around the hot stamping area and around the windowed area;

[0009] When the lid is closed, the hot stamping foil is exposed on the back of the box and has a metallic luster; when the lid is opened, the magnetic component attaches the lid to the back of the box, the decoding chip is embedded in the groove, and the microlens array and the micro-image array are superimposed and precisely aligned at a single point to present a moiré magnified image.

[0010] Furthermore, at least two guide posts are provided around the window area near the magnetic component.

[0011] Furthermore, the hot stamping area is provided with guide holes corresponding to the guide posts.

[0012] Furthermore, the decoding chip is an optically transparent substrate with a thickness of 300-1000 μm.

[0013] Furthermore, the radius of curvature of the microlens array is 100-400 μm, and the linewidth of the microtext array is 8-12 μm.

[0014] Furthermore, both the micro-image array and the microlens array are arranged in a two-dimensional Bravais lattice, and the periodic error and consistency tilt deviation threshold of the micro-image array and the microlens array are greater than ±2°.

[0015] Furthermore, the depth of the groove is the same as the thickness of the decoding chip, and the size of the decoding chip is smaller than the size of the groove.

[0016] Furthermore, the size difference between the decoding chip and the groove is 0.2-0.5mm.

[0017] Furthermore, the size of the windowed area is smaller than the size of the decoding chip.

[0018] Furthermore, the size difference between the windowed area and the decoding chip is 0.8-2.0 mm.

[0019] This application has the following advantages:

[0020] In the embodiments of this application, in contrast to the problems of high production cost, low anti-counterfeiting performance, and limited visual effect in the prior art, this application provides a solution that deconstructs naked-eye 3D micro-nano anti-counterfeiting technology. Specifically, it includes a box body and a box lid. The back of the box body has a hot stamping area with gold foil embedded in it. The gold foil contains a micro-graphic array, and the hot stamping area is recessed into the box body to form a groove. The box lid has a window area with a decoding chip. The side of the decoding chip facing the box body has a microlens array adapted to the micro-graphic array. Magnetic components are provided around the hot stamping area and the window area. When the box lid is closed, the gold foil is exposed on the back of the box body and has a metallic luster. When the box lid is opened, the magnetic components attach the box lid to the back of the box body, the decoding chip is embedded in the groove, and the microlens array and the micro-graphic array are superimposed and precisely aligned at a single point to present a moiré magnified image. By placing hot-stamped foil with an embedded micro-graphic array on the back of the box and a decoding chip with a microlens array on the lid, a moiré magnified image is displayed when the lid is attached to the back of the box. By deconstructing naked-eye 3D micro-nano anti-counterfeiting technology and reducing manufacturing difficulty, the anti-counterfeiting performance of the packaging box is significantly enhanced while presenting a multi-dimensional visual effect. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of a dual-visual-effect anti-counterfeiting packaging box provided in one embodiment of this application;

[0023] Figure 2 This is a flowchart illustrating the steps of a method for preparing a dual-visual-effect anti-counterfeiting packaging box according to an embodiment of this application.

[0024] The reference numerals in the accompanying drawings are as follows:

[0025] 1. Box body; 2. Hot stamping area; 21. Hot stamping foil; 22. Micro-graphic array; 3. Box lid; 4. Window area; 41. Decoding chip; 42. Microlens array; 5. Magnetic suction assembly. Detailed Implementation

[0026] To make the objectives, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] The inventors, through analysis of existing technologies, discovered that current 3D micro-nano anti-counterfeiting technologies still face some technical challenges:

[0028] (1) High-precision manufacturing is difficult, and the mass production pass rate is low. These anti-counterfeiting elements are typically made from transparent thin-film materials (generally 30-100µm thick) and are mainly used in composite films or labels. Therefore, relatively thin transparent films (generally 30-100µm thick) are generally chosen. The thinner the film, the smaller the radius of curvature of the microlens needs to be (range should be 10-50µm) to achieve micro-focusing of the anti-counterfeiting element, according to the microlens focal length calculation formula (the film thickness is three times the radius of curvature of the microlens). Correspondingly, the line width of the micro-images also needs to be smaller (approximately 2.5µm), i.e., a printing resolution of no less than 8000dpi. General printing cannot achieve such a high printing resolution. Therefore, high-precision manufacturing of microlenses, micro-images, and their single-point high-precision alignment (allowing for periodic errors at the sub-micron level) is difficult, resulting in a low mass production pass rate.

[0029] (2) First-line anti-counterfeiting, but not very effective. The anti-counterfeiting effect of this type of anti-counterfeiting element is directly visible to the naked eye. It belongs to first-line anti-counterfeiting technology, with low barriers to counterfeiting and weak anti-counterfeiting performance.

[0030] (3) The visual effect is singular and lacks novelty. Although the visual effect of this type of anti-counterfeiting element is significant, it is all based on the human eye’s vision based on the surface of the element’s angular displacement. The visual effect is singular and lacks novelty, which can easily lead to aesthetic fatigue.

[0031] The inventor deconstructed naked-eye 3D micro-nano anti-counterfeiting technology and developed a new type of micro-nano anti-counterfeiting technology that integrates first- and second-line anti-counterfeiting measures, and also developed a dual-visual-effect anti-counterfeiting packaging box.

[0032] It should be noted that in any embodiment of this application, the packaging box is based on the structure of a flap-type packaging box. In a flap-type packaging box, the lid (flap) and the box body are connected by a common folding edge, and the lid can be folded upward along the folding edge.

[0033] Reference Figure 1 This illustration shows a dual-visual-effect anti-counterfeiting packaging box provided in an embodiment of this application, including a box body 1 and a box lid 3;

[0034] The back of the box body 1 is provided with a hot stamping area 2, the hot stamping area 2 is provided with hot stamping foil 21, the hot stamping foil 21 is embedded with a micro graphic array 22, and the hot stamping area 2 is recessed into the box body 1 to form a groove.

[0035] The box cover 3 is provided with a window area 4, the window area 4 is provided with a decoding chip 41, and the side of the decoding chip 41 facing the box body 1 is provided with a microlens array 42 adapted to the micro-graphic array 22;

[0036] Magnetic components 5 are provided around the hot stamping area 2 and around the window area 4.

[0037] When the lid 3 is closed, the hot stamping foil 21 is exposed on the back of the box body 1 and has a metallic luster; when the lid 3 is opened, the magnetic suction component 5 attaches the lid 3 to the back of the box body 1, the decoding chip 41 is embedded in the groove, and the microlens array 42 and the micro-image array 22 are superimposed and precisely aligned at a single point to present a moiré magnified image.

[0038] In the embodiments of this application, in contrast to the problems of high production cost, low anti-counterfeiting performance, and limited visual effect in the prior art, this application provides a solution that deconstructs naked-eye 3D micro-nano anti-counterfeiting technology. Specifically, it includes a box body 1 and a box cover 3. The back of the box body 1 is provided with a hot stamping area 2, the hot stamping area 2 is provided with hot stamping foil 21, the hot stamping foil 21 is embedded with a micro-graphic array 22, and the hot stamping area 2 is recessed into the box body 1 to form a groove; the box cover 3 is provided with a window area 4, the window area 4 is provided with a decoding chip 41, the decoding chip 41... A microlens array 42 adapted to the micro-image array 22 is provided on one side facing the box body 1; magnetic components 5 are provided around the hot stamping area 2 and the window area 4; when the box lid 3 is closed, the hot stamping foil 21 is exposed on the back of the box body 1 and presents a metallic luster; when the box lid 3 is opened, the box lid 3 is attached to the back of the box body 1 by the magnetic components 5, the decoding chip 41 is embedded in the groove, and the microlens array 42 and the micro-image array 22 are superimposed and precisely aligned at a single point to present a moiré magnified image. By placing the hot stamping foil 21 with the embedded micro-image array 22 on the back of the box body 1, and placing the decoding chip 41 with the microlens array 42 on the box lid 3, after the box lid 3 is attached to the back of the box body 1, a moiré magnified image is presented. By deconstructing the naked-eye 3D micro-nano anti-counterfeiting technology, the manufacturing difficulty is reduced, and the anti-counterfeiting performance of the packaging box is significantly enhanced while presenting a multi-dimensional visual effect.

[0039] The following will further describe a dual-visual-effect anti-counterfeiting packaging box in this exemplary embodiment.

[0040] Understandably, the hot stamping area 2 is located on the back of the box body 1, accessible by the folding edge of the lid 3. The hot stamping area 2 is recessed into the box body 1 to form a groove, the depth of which is the same as the thickness of the decoding chip 41, ensuring a tight fit after the decoding chip 41 is embedded. The size of the hot stamping area 2 is slightly larger than the size of the decoding chip 41, preferably by 0.2-0.5 mm. The hot stamping area 2 is stamped with hot stamping foil 21, which contains a micro-graphic array 22. The micro-graphic array 22 is printed on the release layer surface of the hot stamping foil 21 using nanoprinting or photolithography combined with embossing and ink-scraping processes. A magnetic suction component 5 is provided around the hot stamping area 2 to attach the lid 3 to the back of the box body 1 when the lid 3 is closed.

[0041] As an example, the layer structure of hot stamping foil 21 consists of a base film layer, a release layer, a coloring layer, an aluminum plating layer, and an adhesive layer. The layer structure of conventional photolithographic holographic hot stamping foil 21 is a base film layer, a release layer, a coloring layer, an embossed information layer, an aluminum plating layer, and an adhesive layer. The coloring layer can be created by printing the micro-image array 22 onto the surface of the release layer using nanoprinting, or by fabricating the micro-image array 22 onto the surface of the release layer using a combination of photolithography molding and embossing / filling / ink scraping techniques. This allows for the integrated design of the micro-image array 22 with holographic laser effects.

[0042] In one specific implementation, the release layer surface of the hot stamping foil 21 is fabricated with a micro-graphic array 22 using a nano-printing process. The micro-graphic array 22 is a two-dimensional square Bravais dot matrix arrangement, with each micro-graphic unit being a square pattern with a side length of 10μm and a line width controlled at 10μm. The hot stamping area 2 is located on the back of the box body 1 at a position where the lid 3 can be folded down, and is an 80mm × 80mm rectangular area. The hot stamping foil 21 is fixed to this area using a hot stamping process. The hot stamping area 2 is recessed inward to a certain depth, with a groove depth of 500μm, the same as the thickness of the decoder chip 41. The groove size is designed to be 80.5mm × 80.5mm, leaving a 0.25mm assembly gap with the decoder chip 41 (80mm × 80mm) to ensure the mechanical positioning accuracy when the decoder chip 41 is embedded.

[0043] It should be noted that the microlens array 42 adapted to the microimage array 22 is fabricated on the surface of an optically transparent substrate to form the decoding chip 41. The selected optically transparent substrate is relatively thick, greater than the thickness of existing transparent films (generally 30-100 μm). Therefore, in order to place the microimage array 22 at or near the focal plane of the microlens array 42 to produce a moiré magnification imaging effect, the radius of curvature of the manufactured microlenses can be relatively increased, and the linewidth of the microimages is also increased accordingly. Both the microimage array 22 and the microlens array 42 are arranged in a two-dimensional Bravais lattice, and the requirements for array consistency tilt deviation and periodic error thresholds are increased, significantly improving the mass production yield. Here, the focal plane refers to the plane perpendicular to the optical axis of the microlens and passing through the focal point. For a single microlens (such as a convex lens) in the microlens array 42, parallel light converges to the focal point after passing through the lens, and the plane formed by all the focal points is the focal plane.

[0044] In this embodiment, at least two guide posts are provided around the window area 4 near the magnetic suction component 5.

[0045] As an example, 2-4 miniature guide posts are set around the window area 4 of the hinged cover, near the magnetic attraction point.

[0046] In this embodiment, the hot stamping area 2 is provided with guide holes corresponding to the guide posts.

[0047] Understandably, the flap is folded over to the back of the box, and guide holes corresponding to the guide posts are set in the hot stamping area 2 corresponding to the guide posts of the flap. Corresponding means that the position, size and number of guide holes are all corresponding to the guide posts.

[0048] In this embodiment, the decoding chip 41 is an optically transparent substrate with a thickness of 300-1000um.

[0049] As an example, optically transparent substrates can be made of resin materials such as PET (polyester film), PP (polypropylene), PVC (polyvinyl chloride), PC (polycarbonate), PS (polystyrene), and PMMA (polymethyl methacrylate).

[0050] In this embodiment, both the microtext array 22 and the microlens array 42 are arranged in a two-dimensional Bravais dot matrix, and the periodic error and consistency tilt deviation threshold of the microtext array 22 and the microlens array 42 are > ±2°.

[0051] As an example, since the decoding chip 41 can be made of a relatively thick optically transparent substrate (300-1000 μm), in order to place the micro-image array 22 at or near the focal plane of the microlens array 42 to produce a moiré magnification imaging effect, the radius of curvature of the manufactured microlenses can be relatively increased to 100-400 μm, and the linewidth of the corresponding micro-images is also increased to 8-12 μm, preferably 10 μm; the periodic error requirements of the micro-image array 22 and the microlens array 42 and the threshold for their consistent tilt deviation requirements are increased, with a deviation requirement of >±2°.

[0052] As an example, a window is die-cut in the corresponding area of ​​the packaging box cover 3, such that the size of the window area 4 is slightly smaller than the size of the decoding chip 41, preferably by 0.8-2.0 mm. The decoding chip 41 is then attached to the window surface of the packaging box cover 3, and the microlens array 42 is located inside the window of the packaging box cover 3.

[0053] In one specific implementation, the window area 4 is located in the center of the lid 3, and the hot stamping area 2 is located on the back of the lid 1, corresponding to the window area 4, after the lid 3 is folded along the folding edge. A rectangular window of 79mm × 79mm is die-cut in the center of the lid 3, and the edges of the window are coated with glue for attaching the decoder chip 41. The window size is 1mm smaller than the decoder chip 41 (80mm × 80mm), forming an edge limiting structure. The decoder chip 41 is made of a 500μm thick PET optically transparent substrate, and a microlens array 42 is fabricated on its surface. The microlens array 42 is a square Bravais dot matrix that matches the micro-image array 22, with a single microlens having a radius of curvature of 200μm.

[0054] In one specific implementation, four slots with a diameter of 2mm and a depth of 1mm are respectively provided below the packaging box paper around the rectangular hot stamping area 2, and small magnets are installed in the slots. Correspondingly, slots of the same specifications are opened below the packaging box paper around the rectangular window area 4 of the box cover 3, and opposite magnetic pole magnets are embedded therein. When closed, the magnetic attraction force is ≥5N, ensuring that the box cover 3 can be tightly attached to the back of the box body 1 by magnetic attraction when closed, so that the decoding chip 41 is embedded in the groove, and the microlens array 42 and the micro-graphic array 22 are superimposed and precisely aligned at a single point.

[0055] When the packaging box lid 3 is opened, the lid 3 rotates and is attracted by the small magnets on the back of the box body 1, causing the decoding chip 41 to be precisely positioned in the recessed area of ​​the hot stamping area 2. The decoding chip 41 and the hot stamping area 2 are superimposed according to a preset relative position, so that the microlens array 42 and the micro-image array 22 are precisely aligned at a single point. As a result, the micro-image information hidden in the hot stamping foil 21 presents a three-dimensional depth of field and a 3D dynamic visual effect of moiré magnification with angular displacement due to reconstruction with the microlens array 42, which is a floating or sinking image (if the micro-image array 22 is integrated with the holographic lithography design, it also has a holographic laser effect), thus playing a role in anti-counterfeiting decoding.

[0056] When the box lid 3 is closed, only the hot stamping area 2 will show the metallic (holographic) luster effect of the general hot stamping foil 21; the window area 4 of the box lid 3 will make it easy for consumers to observe the product inside the box.

[0057] Reference Figure 2 This application illustrates a method for preparing a dual-visual-effect anti-counterfeiting packaging box according to an embodiment of the present application. The method includes:

[0058] S110. Embed the micro-graphic array 22 into the hot stamping foil 21, hot stamp the hot stamping foil 21 on the hot stamping area 2 on the back of the box body 1, and concave the hot stamping area 2 to a preset depth to form a groove.

[0059] S120. A microlens array 42 adapted to the microtext and image array 22 is fabricated on the surface of an optically transparent substrate to obtain a decoding chip 41.

[0060] S130. A window is die-cut in a preset area of ​​the box cover 3, and the decoding chip 41 is pasted into the window area 4, so that the microlens array 42 of the decoding chip 41 faces the inside of the box body 1.

[0061] S140. Slots are cut around the hot stamping area 2 and around the windowed area 4, and magnetic suction components 5 are installed.

[0062] The following will further describe a method for preparing a dual-visual-effect anti-counterfeiting packaging box in this exemplary embodiment.

[0063] As described in step S110, the micro-graphic array 22 is embedded in the hot stamping foil 21, the hot stamping foil 21 is hot stamped on the hot stamping area 2 on the back of the box body 1, and the hot stamping area 2 is recessed to a preset depth to form a groove.

[0064] In one embodiment of this application, the specific process of "embedding the micro-graphic array 22 into the hot stamping foil 21" described in step S110 can be further explained in conjunction with the following description.

[0065] As described in the following steps, the micro-graphic array 22 is printed onto the release layer surface of the hot stamping foil 21 using a nano-printing process; or, the micro-graphic array 22 is fabricated onto the release layer surface of the hot stamping foil 21 using a combination of photolithography, molding, embossing, color filling, and ink scraping processes.

[0066] In one specific implementation, a coloring layer is formed by printing the micro-image array 22 onto the surface of the release layer using nanoprinting. Specifically, the release layer of the hot stamping foil 21 is subjected to corona treatment to improve surface tension and ensure ink adhesion. The micro-image array 22 is printed onto the release layer in a two-dimensional Bravais dot matrix arrangement using gravure printing or inkjet printing, and the coloring layer is formed after drying.

[0067] In one specific implementation, the micro-image array 22 is fabricated on the surface of the release layer by photolithography molding combined with embossing and ink-scraping to form an embossed information layer. Specifically, a master template is made, which is then copied onto the surface of the release layer by thermal embossing to form a micro-recessed structure. Ink is then filled into the micro-recessed structure using a doctor blade, excess ink is removed, and the embossed information layer is formed after curing.

[0068] In one specific implementation, the micro-text array 22 is integrated with the holographic laser effect. Specifically, a holographic grating structure is first fabricated by photolithography to form a holographic laser background; then, the micro-text array 22 is fabricated on the holographic background by nanoprinting or molding color filling process, ensuring that the ratio of the micro-text period to the holographic grating period is >10:1 to avoid optical interference.

[0069] In one embodiment of this application, the specific process of step S110, "hot stamping the hot stamping foil 21 onto the hot stamping area 2 on the back of the box body 1 and concave the hot stamping area 2 to a preset depth to form a groove," can be further explained in conjunction with the following description.

[0070] As an example, hot stamping foil 21 is applied to the designed hot stamping area 2 on the back of the packaging box 1 using a hot stamping method, and the hot stamping area 2 is recessed to a certain depth using an embossing process. Alternatively, the hot stamping foil 21 can be applied to the designed hot stamping area 2 on the back of the packaging box 1 using an embossing method (i.e., an integrated hot stamping and embossing process) to a certain depth, ensuring that the thickness of the decoding chip 41 is the same as the depth of the recess in the hot stamping area 2, and that the size of the decoding chip 41 is slightly smaller than the size of the hot stamping area 2 (preferably a size difference of 0.2-0.5 mm). The hot stamping method can be hot stamping or cold stamping, etc.

[0071] In one specific implementation, the prepared hot stamping foil 21 is hot stamped onto the hot stamping area 2 on the back of the box body 1 at a temperature of 180°C and a pressure of 5MPa using a hot stamping machine. Subsequently, a embossing process is performed using a hydraulic press, with an embossing depth of 500μm and a groove flatness error of <±10μm.

[0072] As described in step S120, a microlens array 42 adapted to the microtext array 22 is fabricated on the surface of an optically transparent substrate to obtain a decoding chip 41.

[0073] As an example, a microlens array 42 adapted to the microtexture array 22 is fabricated on the surface of an optically transparent substrate by photolithography molding or photoresist thermal reflow to form a decoding chip 41.

[0074] In one specific implementation, a microlens array 42 adapted to the microtexture array 22 is fabricated. Photoresist spin-coated onto the surface of a PET substrate is exposed through a mask and then subjected to thermal reflow. The heating temperature is controlled at 150°C, and the holding time is 30 minutes, forming a decoding chip 41 for the microlens array 42 with a curvature radius of 300 μm.

[0075] As described in step S130, a window is die-cut in a preset area of ​​the box cover 3, and the decoding chip 41 is pasted into the window area 4, so that the microlens array 42 of the decoding chip 41 faces the inside of the box body 1.

[0076] As an example, a window is die-cut in the corresponding area of ​​the packaging box cover 3, such that the window size is slightly smaller than the size of the decoding chip 41, preferably by 0.8-2.0 mm. By applying glue to the edge of the window in the packaging box cover 3 and attaching the decoding chip 41 to the surface of the window in the packaging box cover 3, the edge of the decoding chip 41 is firmly fixed to the edge of the window in the packaging box cover 3, and the microlens array 42 is located inside the window in the packaging box cover 3.

[0077] As an example, when hot stamping a micro-graphic array with foil onto a groove and then attaching the decoder chip to the window area of ​​the lid, it is difficult to ensure precise alignment of the individual points of the units in the two arrays. In this embodiment, 2-4 micro guide posts are designed around the window area of ​​the hinged lid, near the magnetic attraction point, and micro guide holes matching the micro guide posts are provided at corresponding positions in the hot stamping area on the back of the box. The guide posts are preferably tapered, with a diameter of approximately 1-2 mm and a height of 1-3 mm. The material of the guide posts can be wear-resistant engineering plastics, such as POM or nylon. The guide holes can be tapered or V-grooves, preferably tapered guide holes that match the guide posts.

[0078] As an example, auxiliary alignment marks, such as crosshairs or micro-dots, are added to the edges of the optically transparent substrate and the hot stamping area. These auxiliary alignment marks are manufactured synchronously with the array units and are used only for production calibration, without affecting the final appearance. Array-level fine-tuning is achieved through these auxiliary alignment marks.

[0079] In one specific implementation, four miniature conical guide posts, approximately 1 mm in diameter and 2 mm in height, are arranged around the window area of ​​the hinged lid. Miniature conical guide holes, matching the miniature conical guide posts, are arranged at corresponding positions on the hot-stamping area on the back of the box. When the hinged lid is opened and approaches the back of the box, the guide posts preferentially contact the guide holes. Utilizing the self-centering property of the conical slope, the window area is guided to roughly align with the hot-stamping area, achieving coarse positioning of the array. This stage can tolerate an initial position error of ±0.5 mm. Simultaneously, crosshairs are added to the optically transparent substrate and the edges of the hot-stamping area for production calibration, achieving fine positioning of the array.

[0080] As described in step S140, grooves are made around the hot stamping area 2 and around the windowed area 4, and magnetic suction components 5 are installed.

[0081] As an example, a groove is cut into the gray board below the packaging box paper around the hot stamping area 2 on the back of the packaging box body 1, and a small magnet is installed therein. Similarly, a groove is cut into the gray board below the packaging box paper around the window area 4 of the packaging box lid 3, and a small magnet is installed therein. The magnets are irregularly shaped magnets, such as trapezoidal, triangular, or square magnets, and the directional positioning of the array is achieved by using these irregularly shaped magnets.

[0082] As an example, the precision control of hot stamping foil can be achieved through the positional relationship between the stamping area and the magnetic suction area. For instance, machine vision can be used to magnify and detect the distance between the stamping area and the surrounding magnetic suction areas, ensuring the accuracy of the stamping area. Similarly, the precision control of decoder chip mounting can also be achieved through machine vision to magnify and detect the distance between the decoder chip and the surrounding magnetic suction areas, ensuring accurate decoder chip mounting. Finally, precise control of the die-cutting position on the packaging box is crucial, ensuring that the die-cutting deviation is within the acceptable error range.

[0083] In one specific implementation, an asymmetrical or keyway structure is designed for the magnetic attraction points using irregularly shaped magnets, such as square magnets paired with D-shaped slots, rather than simple circular magnets. Specifically, four neodymium magnets with tapered outer edges, 3-5mm in diameter, are embedded under the packaging paper around the perimeter of the flap opening area. Matching tapered magnetic attraction slots, containing ferrite or neodymium magnets, are set under the packaging paper around the perimeter of the hot-stamped area on the back of the box. Combined with the magnetic attraction, when the guide post of the lid is fully inserted into the guide hole on the back of the box, the two arrays enter the precise positioning range. The magnetic force pulls them together, achieving unit-level alignment with an accuracy of ±10 micrometers, meeting the requirements of microlens arrays.

[0084] When the flap is opened, the magnets automatically slide into the conical groove under magnetic attraction. The conical slope generates radial force, forcing the two arrays to fine-tune their positions during the fitting process until they are perfectly aligned. The magnetic attraction points should be arranged at the four corners of the array area to form a "quadrilateral stable structure" to prevent rotational shift.

[0085] In one embodiment of this application, it further includes:

[0086] The period of the moiré pattern is controlled by adjusting the period or angle of the microlens array 42 and the micrographic array 22.

[0087] It should be noted that the structural periods of the microimage array 22 and the microlens array 42 are similar. Furthermore, the ratio of the periodic magnification of the microimages in the microimage array 22 after moiré magnification imaging to the period difference between the microimage array 22 and the microlens array 42 should meet certain requirements. Assuming that the periods of the microlens array 42 in the decoding chip 41 of this novel micro-nano anti-counterfeiting technology are t11 and t12 in the x and y directions respectively, and the thickness of the substrate of the decoding chip 41 is L, which should be approximately equal to the focal length of the microlens; and that the periods of the hot stamping area 2 in the microimage array 22 in this novel micro-nano anti-counterfeiting technology are t21 and t22 in the x and y directions respectively, and that the microimage array 22 layer is located on the focal plane of the microlens array 42 layer.

[0088] When the microlens array 42 of the decoding chip 41 interacts with the micro-image array 22 of the hot stamping area 2, a moiré amplification effect is generated. Based on the relevant formulas for moiré amplification, the magnification of the micro-images in the x and y directions can be obtained as follows:

[0089] M x =t 11 / (t 21 -t 11 M y =t 12 / (t 22 -t 12 (1)

[0090] M x With My When both are positive, the resulting moiré pattern is oriented in the same direction as the microtext in the corresponding x and y directions, appearing as an upright image; if both are negative, the resulting moiré pattern is oriented in the opposite direction to the microtext in the corresponding x and y directions, appearing as an inverted image. The size H of the moiré pattern is:

[0091] H = T1 2 / T1-T2| (2)

[0092] If there is a certain angle α between the microlens array 42 and the micrographic array 22, and the two arrays have different periods, t1 and t2 respectively, then the period of the moiré pattern is:

[0093]

[0094] According to the above formula, the period of the moiré pattern can be controlled by adjusting the periods of the microlens array and the microtext array, or the angle between them, thereby adjusting the moiré magnification. When the periods of the two arrays are the same (i.e., t1 = t2 = t), the magnification of the moiré pattern is:

[0095] M = T / t = 1 / [2sin(α / 2)] (4)

[0096] When the height of the microlens is set to h and the size of the microlens is Φ, the radius of curvature r of the microlens is:

[0097] r=(φ 2 +4h 2 ) / (8h) (5)

[0098] This novel micro-nano anti-counterfeiting technology should satisfy the requirement that the thickness L of the decoding chip substrate is approximately equal to the focal length of the microlens. When the refractive index of the microlens is set to n, the focal length f of the microlens is:

[0099] f=r / (n-1)=[(φ 2 +4h 2 ) / (8h)] / (n-1)≈L (6)

[0100] The novel micro-nano anti-counterfeiting technology of this application deconstructs naked-eye 3D micro-nano anti-counterfeiting technology and, based on the hinged box structure, cleverly combines it with hot stamping process and grating decoding to overcome the technical difficulties existing in the current naked-eye 3D micro-nano anti-counterfeiting technology (micro-focused moiré imaging technology). It can present multi-dimensional visual effects while significantly enhancing the anti-counterfeiting performance of the packaging box.

[0101] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0102] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0103] The above provides a detailed description of a dual-visual-effect anti-counterfeiting packaging box provided by this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A dual-visual-effect anti-counterfeiting packaging box, comprising a box body and a box lid, characterized in that, The back of the box has a hot stamping area, the hot stamping area has hot stamping foil, the hot stamping foil has a micro-graphic array embedded in it, and the hot stamping area is recessed into the box to form a groove. The box cover has a window area, the window area has a decoding chip, and the side of the decoding chip facing the box body has a microlens array adapted to the micro-graphic array; Magnetic components are provided around the hot stamping area and around the windowed area; When the lid is closed, the hot stamping foil is exposed on the back of the box and has a metallic luster; when the lid is opened, the magnetic component attaches the lid to the back of the box, the decoding chip is embedded in the groove, and the microlens array and the micro-image array are superimposed and precisely aligned at a single point to present a moiré magnified image.

2. The dual visual effect anti-counterfeiting packaging box according to claim 1, characterized in that, At least two guide posts are provided around the window area near the magnetic component.

3. The dual visual effect anti-counterfeiting packaging box according to claim 2, characterized in that, The hot stamping area is provided with guide holes corresponding to the guide posts.

4. The dual visual effect anti-counterfeiting packaging box according to claim 1, characterized in that, The decoding chip is an optically transparent substrate with a thickness of 300-1000um.

5. The dual visual effect anti-counterfeiting packaging box according to claim 4, characterized in that, The radius of curvature of the microlens array is 100-400 μm, and the linewidth of the microtext array is 8-12 μm.

6. The dual visual effect anti-counterfeiting packaging box according to claim 4, characterized in that, Both the micro-image array and the microlens array are arranged in a two-dimensional Bravais lattice. The periodic error and consistency tilt deviation threshold of the micro-image array and the microlens array are greater than ±2°.

7. The dual visual effect anti-counterfeiting packaging box according to claim 1, characterized in that, The depth of the groove is the same as the thickness of the decoder chip, and the size of the decoder chip is smaller than the size of the groove.

8. The dual visual effect anti-counterfeiting packaging box according to claim 7, characterized in that, The size difference between the decoding chip and the groove is 0.2-0.5 mm.

9. The dual visual effect anti-counterfeiting packaging box according to claim 7, characterized in that, The size of the windowed area is smaller than the size of the decoding chip.

10. The dual visual effect anti-counterfeiting packaging box according to claim 9, characterized in that, The size difference between the windowed area and the decoding chip is 0.8-2.0 mm.

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