Micro-optical imaging system and anti-counterfeiting product

Abstract

The utility model discloses a micro-optical imaging system and an anti-counterfeiting product. The micro-optical imaging system comprises a light-transmitting spacing layer; the micro-imaging structure array comprises a plurality of micro-imaging structures and is arranged on one side of the light-transmitting spacing layer; the miniature image-text array comprises a plurality of miniature images and texts and is arranged on the other side opposite to the light-transmitting spacing layer; wherein the micro imaging structure array is used for amplifying and imaging the miniature image-text array to form amplified images and texts, and the arrangement density of the miniature images and texts in at least part of the area of the miniature image-text array is different from that in other areas, so that the brightness of at least two amplified images and texts is different; and / or the brightness of at least two areas of the amplified image-text is different. The magnification imaging of the miniature image-text is realized through the micro imaging structure array, so that the details of the miniature image-text can be clearly displayed. The brightness of the at least two amplified images and texts is different and / or the brightness of the at least two areas of the amplified images and texts is different, so that the brightness of the amplified images and texts is distinguished.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging technology, and in particular to a micro-optical imaging system and an anti-counterfeiting product. Background Technology

[0002] Micro-optical imaging systems can be widely used in product packaging, anti-counterfeiting labels, and other applications. By creating a naked-eye 3D effect, these systems can enrich the visual appeal of product packaging or improve the recognizability of anti-counterfeiting labels.

[0003] Existing technologies have emerged that utilize micro-optical systems for anti-counterfeiting. Patents such as CN1906547B (which describes a synthetic magnification micro-optical system) and CN102991860B (which describes an anti-counterfeiting packaging film with 3D and dynamic display effects) describe the magnified imaging effects of micro-imaging structure arrays and micro-image arrays. However, all current related microlens applications produce macroscopically magnified images with uniform brightness, resulting in a relatively simple effect. Furthermore, relying solely on magnified images for anti-counterfeiting makes them easily imitated and copied, significantly reducing their anti-counterfeiting effectiveness. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of existing technologies where macroscopic magnified images all have the same brightness, the presentation effect is relatively simple, and the anti-counterfeiting marks are easy to be imitated and copied. This invention provides a micro-optical imaging system and an anti-counterfeiting product.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] This utility model discloses a micro-optical imaging system, which includes:

[0007] Light-transmitting spacer layer;

[0008] A micro-imaging structure array, comprising several micro-imaging structures, is disposed on one side of a light-transmitting spacer layer;

[0009] A micro-image array, containing several micro-images, is set on the opposite side of the light-transmitting spacer layer;

[0010] Wherein, the micro-imaging structure array magnifies the micro-image array to form magnified images, and the arrangement density of the micro-images in at least a portion of the micro-image array is different from that in other regions, so that the brightness of at least two of the magnified images is different; and / or, the brightness of at least two regions of the magnified images is different.

[0011] In this solution, the aforementioned structural form is used to achieve magnified imaging of micro-images through a micro-imaging array, allowing the details of the micro-images to be clearly displayed. The brightness of at least two magnified images differs, and / or the brightness of at least two regions of the magnified image differs, thereby increasing the distinguishability of the magnified image. This makes the magnified image distinguishable not only in shape but also in brightness, increasing the difficulty of identifying anti-counterfeiting marks. Furthermore, the aforementioned structural form enhances the diversity of presentation.

[0012] Preferably, the micro-image array has at least two placement areas, each placement area has a placement position for placing the micro-image, and the micro-image in each placement area is magnified to form the magnified image;

[0013] The number of the micro-images differs in at least two of the placement areas.

[0014] In this scheme, using the above-described structural form, the imaging brightness of the micro-images depends not only on the brightness of individual images but also on the density of the micro-image arrangement. With this structural form, the number of micro-images differs in at least two placement areas, resulting in different brightness levels of the magnified images ultimately produced by these two placement areas.

[0015] Preferably, the placement position for the micro-image or text accounts for more than 30% of the total placement positions.

[0016] Preferably, the effective values ​​of the micro-images retained in at least two regions forming the enlarged image are different.

[0017] In this scheme, the above-mentioned structural form is adopted so that the effective values ​​of the micro-images and texts in at least two regions are different, thereby increasing the distinguishing dimension of the enlarged images and texts. This allows the enlarged images and texts to be distinguishable not only in shape but also in brightness, thus increasing the difficulty of identifying anti-counterfeiting marks.

[0018] Preferably, the light-transmitting spacer layer includes an optical channel connected to the micro-image array, and the micro-imaging structure array is connected to the side of the optical channel away from the micro-image array.

[0019] Preferably, the light-transmitting spacer layer includes an optical channel and a substrate layer connected together, the micro-imaging structure array is connected to the side of the optical channel away from the substrate layer, and the micro-image array is connected to the side of the substrate layer away from the optical channel.

[0020] Preferably, a plurality of the micro-images are distributed along a first direction and a second direction, the first direction and the second direction intersecting;

[0021] The micro-imaging structure array is distributed along a third direction and a fourth direction, wherein the third direction is parallel to the first direction and the fourth direction is parallel to the second direction; or...

[0022] The micro-imaging structure array is distributed along a third direction and a fourth direction, the third direction forming a second angle with the first direction, and the fourth direction forming a third angle with the second direction.

[0023] Preferably, the arrangement and spacing of adjacent micro-images are based on the preset magnification and preset depth of field configuration of the micro-optical imaging system.

[0024] In this scheme, by adopting the above-mentioned structural form, different effects of stereoscopic and depth changes in magnified images and text can be obtained by changing the preset magnification and preset depth of field.

[0025] Preferably, the micro-graphic array includes at least two stacked graphic layers, on which the micro-graphics are disposed.

[0026] In this scheme, by adopting the above-mentioned structural form, the superposition of sub-image layers of different styles will present multiple sets of different comprehensive magnified images. By designing the styles of the micro-images on different sets of sub-image layers, they can complement and enhance each other, which can greatly increase the diversity of effects that the micro-optical imaging system can achieve.

[0027] This utility model further discloses an anti-counterfeiting product, characterized in that the anti-counterfeiting product uses the micro-optical imaging system described above.

[0028] In this solution, a micro-imaging structure array is used to magnify and image miniature images, allowing for clear display of their details. The difference in brightness between at least two magnified images and / or between at least two regions of the magnified image increases the distinguishability of the magnified image, making it differentiated not only by shape but also by brightness, thus increasing the difficulty of identifying anti-counterfeiting marks. Furthermore, this approach enhances the diversity of presentation.

[0029] The positive and progressive effects of this utility model are as follows:

[0030] The micro-imaging structure array enables magnified imaging of miniature images, allowing for clear display of their details. The difference in brightness between at least two magnified images and / or between at least two regions of the magnified image increases the distinguishability of the magnified image, making it differentiated not only by shape but also by brightness, thus increasing the difficulty of identifying anti-counterfeiting marks. Furthermore, this approach enhances the diversity of presentation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a black and white dot matrix pattern of Embodiment 1 of this utility model.

[0032] Figure 2 This is a schematic diagram illustrating the adaptation of a black-and-white dot matrix image to a micro-text layer in Embodiment 1 of this utility model.

[0033] Figure 3 This is a schematic diagram of the full-density micro-image array of Embodiment 1 of this utility model.

[0034] Figure 4 This is a schematic diagram (a) of the miniature graphic array of Embodiment 1 of this utility model.

[0035] Figure 5 This is a schematic diagram (II) of the miniature graphic array of Embodiment 1 of this utility model.

[0036] Figure 6 This is a schematic diagram (III) of the miniature graphic array of Embodiment 1 of this utility model.

[0037] Figure 7 This is a schematic diagram (four) of the miniature graphic array of Embodiment 1 of this utility model.

[0038] Figure 8 This is a schematic diagram (I) of the micro-optical imaging system of Embodiment 1 of this utility model.

[0039] Figure 9 and Figure 10 This is a schematic diagram of the imaging effect of a micro-optical imaging system according to different exemplary embodiments 1.

[0040] Figure 11 This is a schematic diagram (II) of the micro-optical imaging system of Embodiment 1 of this utility model.

[0041] Figure 12 This is a schematic diagram of a miniature graphic with a recessed structure according to Embodiment 1 of this utility model.

[0042] Figure 13 This is a schematic diagram of a miniature graphic with a raised structure according to Embodiment 1 of this utility model.

[0043] Figure 14 This is a schematic diagram of a micro-graphic with a grid structure according to Embodiment 1 of this utility model.

[0044] Figure 15 This is a schematic diagram of a miniature graphic with a raised grid structure according to Embodiment 1 of this utility model.

[0045] Figure 16 This is a schematic diagram of a miniature graphic with a recessed grid structure according to Embodiment 1 of this utility model.

[0046] Figure 17 This is a schematic diagram of the micro-images with a directly printed coloring layer in Embodiment 1 of this utility model.

[0047] Figure 18 This is a schematic diagram of the micro-images filled with coloring material in the recessed structure of Embodiment 1 of this utility model.

[0048] Figure 19 This is a distribution diagram (I) of the micro-images in Embodiment 1 of this utility model.

[0049] Figure 20 This is a distribution diagram (I) of the focusing structure in Embodiment 1 of this utility model.

[0050] Figure 21 This is a distribution diagram (II) of the micro-images in Embodiment 1 of this utility model.

[0051] Figure 22 This is a distribution diagram (II) of the focusing structure in Embodiment 1 of this utility model.

[0052] Figure 23 This is a distribution diagram of the micro-images and focusing units in Embodiment 1 of this utility model.

[0053] Figure 24 and Figure 25 This is a schematic diagram of the imaging effect of the micro-optical imaging system in different embodiments of the present invention (I).

[0054] Figure 26 and Figure 27 This is a schematic diagram (II) of the imaging effect of the micro-optical imaging system of different embodiments 1 of this utility model.

[0055] Figure 28 and Figure 29 This is a schematic diagram (III) of the imaging effect of the micro-optical imaging system of different embodiments 1 of this utility model.

[0056] Figure 30 This is a schematic diagram of the imaging effect of the micro-optical imaging system according to Embodiment 1 of this utility model.

[0057] Figure 31 This is a side view of the microlens unit of Embodiment 1 of this utility model.

[0058] Figure 32 According to Figure 31 A schematic diagram of a micro-imaging structure array formed by individual microlenses.

[0059] Figure 33 This is a schematic diagram of the micro-imaging structure array of Embodiment 1 of this utility model.

[0060] Figure 34This is a schematic diagram of the structure of the micro-optical imaging system of Embodiment 1 of this utility model (without a film-transparent spacer layer).

[0061] Figure 35 This is a schematic diagram of the structure of the micro-optical imaging system of Embodiment 1 of this utility model (reduced film-transparent spacer layer).

[0062] Figure 36 This is a flowchart illustrating the manufacturing process of the micro-optical imaging system according to Embodiment 2 of this utility model.

[0063] Explanation of reference numerals in the attached figures:

[0064] Micro-optical imaging system 1000;

[0065] Micro-imaging structure array 100;

[0066] Micro-imaging structure 10;

[0067] Focus on structure 1;

[0068] Optical channel 2;

[0069] Miniature graphic layer 3;

[0070] Sub-text layer 31;

[0071] Placement slot 32;

[0072] Microtext 33;

[0073] Black and white dot matrix Figure 4 ;

[0074] Image 200;

[0075] 300 at the grassroots level. Detailed Implementation

[0076] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0077] Example 1

[0078] like Figures 1 to 35As shown, this embodiment provides a micro-optical imaging system 1000, which includes a light-transmitting spacer layer, a micro-imaging structure array 100, and a micro-image array 33. The micro-imaging structure array 100 includes a plurality of micro-imaging structures 10 disposed on one side of the light-transmitting spacer layer; the micro-image array 33 includes a plurality of micro-images 33 disposed on the opposite side of the light-transmitting spacer layer. The micro-imaging structure array 100 magnifies the micro-image array 33 to form magnified images. The arrangement density of micro-images 33 in at least a portion of the micro-image array 33 differs from that in other areas, thereby allowing at least two magnified images to have different brightness, and also allowing at least two regions of the magnified images to have different brightness; furthermore, it allows at least two magnified images to have different brightness, and simultaneously allows at least two regions of the magnified images to have different brightness.

[0079] Preferably, at least two of the magnified images have different brightness levels, and at least two regions of the magnified images also have different brightness levels. Using this structural form, the micro-imaging array 100 achieves magnified imaging of the miniature images 33, allowing the details of the miniature images 33 to be clearly displayed. The difference in brightness between at least two of the magnified images and the difference in brightness between at least two regions of the magnified images increase the distinguishability of the magnified images, making them distinguishable not only in shape but also in brightness, thus increasing the difficulty of identifying anti-counterfeiting marks. Furthermore, this structural form enhances the diversity of presentation.

[0080] Preferably, in this embodiment, the brightness of each enlarged image can be different, thereby further increasing the diversity of presentation and thus further increasing the difficulty of anti-counterfeiting labels. Furthermore, which enlarged images have different brightness levels, or which areas of the enlarged images have different brightness levels, can be adjusted according to actual needs and are not limited here.

[0081] It should be specifically noted that the regions of the enlarged image can be combined in various ways to form the enlarged image. The aforementioned difference in brightness between at least two regions of the enlarged image refers to the difference in brightness between at least two regions that make up the enlarged image. Furthermore, the aforementioned difference in the arrangement density of the micro-images 33 within at least some regions of the micro-image array 33 refers to the difference in arrangement density between at least two regions of the micro-image array 33. The specific two regions can be selected based on actual needs and are not specifically limited here.

[0082] like Figures 3 to 7As shown, the array of micro-images 33 has at least two placement areas, each with a placement position 32 for placing micro-images 33. The micro-images 33 in each placement area are magnified to form magnified images. The number of micro-images 33 in the at least two placement areas is different. With this structure, the imaging brightness of the micro-images 33 depends not only on the brightness of a single micro-image 33 but also on the density of the micro-images 33. Because the number of micro-images 33 in the at least two placement areas is different, the final magnified images from the two placement areas have different brightness levels.

[0083] It should be noted that placing the micro-images 33 in a placement area can form micro-images 33 per unit area. Placement position 32 is the location where each micro-image 33 can be placed.

[0084] This example illustrates the impact of the arrangement density of the micro-text 33 on the brightness of the magnified text (using the capital letter A as an example). Figure 3 The diagram shows a full-density array of micro-images 33. The micro-imaging structure array 100 and the micro-images 33 have the same rectangular arrangement, and they have a one-to-one correspondence under a certain periodic rule. Keeping the arrangement and periodic rule of the micro-imaging structure array 100 and the micro-image 33 array unchanged, every two micro-images 33 in the array are deleted, thus leaving the placement position 32 corresponding to the deleted micro-image 33 vacant. Figure 4 and Figure 5 As shown, when the micro-images 33 are combined with the micro-imaging structure array 100, they will produce macroscopically magnified images of the same size and style as those in a conventional arrangement, except that the brightness of the macroscopically magnified images will be half that of the full-density micro-image array 33. Figure 6 and Figure 7 As shown, if one of every three or four micro-images in the micro-image array 33 is deleted, the placement position 32 corresponding to the deleted micro-image 33 becomes vacant, and the brightness of the final macroscopically magnified image will become two-thirds or three-quarters of the original. Furthermore, the above also applies to different arrangements of the micro-imaging structure array 100 and the micro-images 33, such as hexagonal arrangements, triangular arrangements, etc. In other words, a full-density micro-image array 33 is adapted to the micro-imaging structure array 100; by deleting some micro-images 33, the density of the micro-images 33 is changed, thereby controlling the brightness of the macroscopically magnified image.

[0085] In this embodiment, the proportion of placement positions 32 for micro-images 33 to the total placement positions 32 is not less than 30%. Specifically, the density of micro-images 33 affects the brightness of the macro-magnified images; the lower the density of micro-images 33 (the more placement positions without micro-images 33), the lower the brightness of the macro-magnified images. Therefore, limiting the proportion of placement positions 32 for micro-images 33 to the total placement positions 32 ensures that the brightness of the macro-magnified images remains visible to the operator.

[0086] In actual use, the specific proportion of the placement position 32 of the miniature graphic 33 to the total placement position 32 can be selected according to actual needs, and no specific limitation is made here.

[0087] The retained effective values ​​of the micro-images 33 in at least two regions forming the enlarged image are different. Using the above structural form increases the distinguishing dimensions of the enlarged image, making it distinguishable not only in shape but also in brightness, thus increasing the difficulty of identifying the anti-counterfeiting mark. It should be specifically noted that, as... Figure 2 As shown, during the masking process, black and white dots are used. Figure 4 The full-density micro-text / image array 33 is processed. Micro-text / image 33 corresponding to white pixels is retained, while micro-text / image 33 corresponding to black pixels is removed. In other words, a black and white dot matrix is ​​used... Figure 4 It can change the valid value retained by the micro-image 33, specifically, the black and white dot matrix. Figure 4 When a region consisting entirely of white pixels is used to mask the microimage 33, the retained effective value of the microimage 33 is the same as the effective value of the unmasked microimage 33 (referred to as the maximum value); black and white dot matrix Figure 4 When the micro-image 33 is masked in an area consisting entirely of black pixels, the effective value of the micro-image 33 is reduced to zero; black and white dot matrix Figure 4 When a region containing both white and black pixels is masked onto the microtext 33, the effective value retained by the microtext 33 can be reduced. In this case, the effective value retained by the microtext 33 is between the maximum value and zero. The specific value depends on the proportion of white and black pixels. The higher the proportion of white pixels (the closer to white), the closer the retained effective value is to the maximum value; the lower the proportion of white pixels (the closer to black), the closer the retained effective value is to zero.

[0088] In this embodiment, the material of the light-transmitting spacer layer is a light-transmitting thin film material. Specifically, the light-transmitting spacer layer can be most commercially available polymer films, including acrylic, celluloid, amide fiber, polycarbonate, polyester, polypropylene, polyethylene, and polyvinyl chloride. The thickness of the light-transmitting spacer layer is close to the focal length of the micro-imaging structure array 100; the closer the two are to each other, the better the imaging effect.

[0089] The light-transmitting spacer layer can be made without a film. In this embodiment, such as... Figure 34 As shown, the light-transmitting spacer layer may further include an optical channel 2, which is connected to the micro-image array 33. The micro-imaging structure array 100 is connected to the side of the optical channel 2 away from the micro-image array 33. The micro-imaging structure 10 includes a focusing structure 1, which is connected to the side of the optical channel 2 away from the micro-image layer 3. This structural configuration improves the optical efficiency and imaging quality of the micro-optical imaging system 1000. The focusing structure 1 of the micro-imaging structure 10 helps to focus light from the micro-image layer 3, enhancing the clarity of the magnified image. Alternatively, in other embodiments, the light-transmitting spacer layer may also include a connected optical channel 2 and a substrate layer, with the micro-imaging structure array 100 connected to the side of the optical channel 2 away from the substrate layer, and the micro-image array connected to the side of the substrate layer away from the optical channel 2.

[0090] For the film-free light-transmitting spacer layer, the length of the optical channel 2 is close to the focal length of the focusing structure 1, and the difference between the length of the optical channel 2 and the focal length of the focusing structure 1 is less than or equal to a first set threshold. The first set threshold is 10% of the focal length of the focusing structure 1, preferably 5% of the focal length of the focusing structure 1. By configuring the length of the optical channel 2 in this way, the miniature image 33 is positioned as close as possible to the focal length of the focusing structure 1, ensuring clear imaging of the overall optical system. In this way, the optical channel 2 replaces the substrate film in related technologies, meeting the requirements of film removal and plasticization, and avoiding the defect of the substrate film being difficult to tear.

[0091] The light-transmitting spacer layer can also be made using a thinner film method, such as... Figure 35As shown. For the reduced-film light-transmitting spacer layer, the sum of the length of the optical channel 2 and the thickness of the base layer 300 is close to the focal length of the focusing structure 1. Specifically, the difference between the sum of the length of the optical channel 2 and the thickness of the base layer 300 and the focal length of the focusing structure 1 is less than or equal to a second set threshold. The second set threshold is 10% of the focal length of the focusing structure 1, preferably 5% of the focal length of the focusing structure 1. By configuring the length of the optical channel 2 and the thickness of the base layer 300, the miniature image 33 is positioned as close as possible to the focal length of the focusing structure 1, ensuring clear imaging of the overall optical system. Based on the above conditions, the length of the optical channel 2 and the thickness of the base layer 300 can be flexibly set. Preferably, the length of the optical channel 2 is greater than or equal to the thickness of the base layer 300. By replacing most of the substrate film in related technologies with the optical channel 2 structure, the trend of plastic reduction is met. In other words, the core of the reduced-film design lies in the optimized configuration of the light-transmitting spacer layer. Specifically, when the light-transmitting spacer layer is reduced in thickness, the sum of the length of the optical channel 2 and the thickness of the base layer 300 is close to the focal length of the focusing structure 1, with the difference not exceeding 10% of the focal length, preferably 5%. By reasonably setting the length of the optical channel 2 and the thickness of the base layer 300, and while meeting the above conditions, the optical channel 2 replaces most of the traditional substrate film, aligning with the trend of plastic reduction, while ensuring that the micro-image 33 is located at the focal length of the focusing structure 1, thus guaranteeing clear imaging of the optical system. During the process of reducing the thickness of the film, the length of the optical channel 2 and the thickness of the base layer 300 can be flexibly adjusted, preferably with the length of the optical channel 2 being greater than or equal to the thickness of the base layer 300.

[0092] It should be noted that in this embodiment, when the light-transmitting spacer layer can be made without a film, the optical channel 2 is directly connected to the micro-image array 33; while for the reduced-film light-transmitting spacer layer, the optical channel 2 and the micro-image array 33 are indirectly connected through the base layer 300. In other embodiments, the connection method between the optical channel 2 and the micro-image array 33 can be adjusted according to actual needs, and is not limited here.

[0093] A micro-imaging structure array is composed of several micro-imaging structures arranged according to a specific pattern. These micro-imaging structures can be refractive, diffractive, or reflective, or a combination thereof. Products corresponding to refractive micro-imaging structures are observed from the side of the micro-imaging structure; products corresponding to reflective micro-imaging structures need to be observed from the side of the micro-image layer.

[0094] Regarding the structure of microtext layer 3, refer to... Figure 11The micro-image layer 3 includes a plurality of micro-images 33, which are arranged in an array. In this embodiment of the invention, the micro-images 33 are patterns or text on the order of micrometers, and are visually distinct from the surrounding areas. Optionally, the micro-images 33 may possess one or more of the following characteristics: transparency, color, reflection, interference, dispersion, or polarization.

[0095] like Figure 12 As shown, the micro-image 33 has a recessed structure, such as Figure 13 As shown, the micro-graphic 33 has a raised structure. Or, as... Figure 14 As shown, the microtext / image unit has a grid structure; as Figure 15 As shown, the micro-graphics 33 have a raised grid structure; as Figure 16 As shown, the micro-image 33 has a recessed grid structure. When the micro-image 33 has a grid structure, it exhibits interference characteristics, achieving a visual effect different from its surroundings. Depending on the requirements, the micro-image 33 can be selected from one or more of a periodic grating structure, a random dot matrix structure, or a scattering structure. Furthermore, various coatings, such as gold, aluminum, and zinc sulfide, can be formed on all or part of the surface of the grid structure, effectively improving the brightness and contrast of the grid structure through the coating. Alternatively, as... Figure 17 As shown, the micro-image 33 is a directly printed coloring layer (e.g., colored ink). Due to the small size of the micro-image 33, directly printing such a fine graphic structure requires special processes and equipment. The printing method for the micro-image 33 disclosed in CN201110074244.0 can be used for preparation. Alternatively, as... Figure 18 As shown, the microtext 33 has a recessed structure filled with a colorant (e.g., colored ink). Optionally, the depth of the recessed structure is between 1 and 5 micrometers. The microtext 33 is fabricated by first preparing the recessed structure and then filling the recess with the colorant.

[0096] like Figure 11 As shown, the micro-image layer 3 has a multi-layer structure. The micro-image layer 3 includes at least two stacked sub-image layers 31, on which micro-images 33 are disposed. Optionally, the image content, color, style, arrangement, and material of the micro-images 33 on different sub-image layers 31 can be flexibly configured. For example, the micro-images 33 on different sub-image layers 31 may have overlapping areas and different colors. The micro-imaging structure array 100 magnifies and images the micro-images 33 on different sub-image layers 31. The superposition of micro-images 33 on different sub-image layers 31 presents multiple sets of different comprehensive magnified images 200. By cleverly designing the styles of different sets of micro-images 33, they can complement and enhance each other, greatly increasing the diversity and aesthetics of the effects achievable by the micro-optical imaging system 1000.

[0097] There are several options for the arrangement of the micro-image array 33 and the micro-imaging structure array 100 in the micro-image layer 3. Optionally, the arrangement of the micro-images 33 in the micro-image array 33 and the arrangement of the individual microlenses in the micro-imaging structure array 100 are configured based on the desired magnification and preset depth of field of the overall micro-optical imaging system 1000. Specifically, the arrangement distance between adjacent micro-images 33 and adjacent focusing structures 1 are configured based on the preset magnification and preset depth of field. The following detailed explanation, in conjunction with the accompanying drawings, illustrates the relationship between the arrangement of the micro-images 33 and the focusing structure 1 and the magnification and stereoscopic depth of field.

[0098] <First Example>

[0099] In this example, the micro-graphics 33 and the focused structure 1 are arranged in the same way.

[0100] Figure 19 This is a distribution map of the micro-image 33. Figure 20 This is a distribution diagram of focused structure 1. (Example) Figure 19 As shown, several miniature images 33 (using the letter A as an example) are distributed along the first direction X and the second direction Y. The first direction X and the second direction Y intersect; for example, the first direction X and the second direction Y are orthogonal coordinate axes. Figure 20 As shown, the focusing structure 1 has a circular cross-section and is distributed along the third direction X' and the fourth direction Y'. The third direction X' is parallel to the first direction X, and the fourth direction Y' is parallel to the second direction Y.

[0101] like Figure 22 As shown, focusing structure 1 has a regular hexagonal cross-section, and adjacent focusing structures 1 are arranged with parallel edges. The micro-figure 33 (shown using the letter A as an example) has the same arrangement as focusing structure 1.

[0102] In the example above, the miniature images 33 are arranged according to a first coordinate system formed by the first direction X and the second direction Y, and the focusing structure 1 is arranged according to a second coordinate system formed by the third direction X' and the fourth direction Y'. The angle between the second coordinate system and the first coordinate system is 0°. By using this method, different magnification and stereoscopic depth effects can be achieved depending on the arrangement distance of the miniature images 33 and the focusing structure 1.

[0103] Specifically, combined Figures 19-22 The arrangement distance T of the micro-images 33 along the first direction X PX Defined as the distance between the centers of two adjacent micro-texts 33 in the first direction X. The arrangement distance T of the micro-texts 33 along the second direction Y. PYDefined as the distance between the centers of two adjacent miniature images 33 in the second direction Y. The arrangement distance T of the focusing structure 1 along the third direction X'. LX Defined as the distance between the structural centers of two adjacent focusing structures 1 in the third direction X', and the arrangement distance T of focusing structures 1 along the fourth direction Y'. LY Defined as the distance between the centers of two adjacent focusing structures 1 in the fourth direction Y'.

[0104] The specific magnification of the micro-optical imaging system 1000 is as follows:

[0105] M=T L / |T L -T P |

[0106] Where M is the method magnification of the micro-optical imaging system 1000, and T L To focus on the arrangement distance of structure 1, T P This refers to the spacing between the miniature images 33.

[0107] The specific dimensions of 3D depth of field are:

[0108] D = M * f

[0109] Where D is the stereo depth of field of the micro-optical imaging system 1000, and f is the focal length of the micro-focusing structure 1.

[0110] Combining the above formula, T LX and T PX The magnification MX of the miniature image 33 in the first direction X and the stereoscopic depth D are determined. X T LY and T PY The magnification M of the micrograph 33 in the second direction Y is determined. Y and 3D depth of field D Y In addition, M X M Y Both can be the same or different, and can be flexibly and independently designed in different sizes according to needs. Similarly, D X D Y Both can be the same or different, and can be designed flexibly and independently in different sizes as needed.

[0111] <Second Example>

[0112] In this example, the array of micro-images 33 formed by the micro-images 33 and the micro-imaging structure array 100 containing the focusing structure 1 form an angle. Figure 23 This is a distribution diagram of the micro-graphics 33 and the focused unit. (See diagram below.) Figure 23As shown, there is a second angle θ1 between the first direction X and the third direction X', and a third angle θ2 between the second direction Y and the fourth direction Y'. Optionally, the second angle θ1 and the third angle θ2 are the same, that is, there is a deflection angle between the first coordinate system and the second coordinate system. It should be noted that, in order to ensure the imaging effect, θ1 and θ2 are usually less than or equal to 5°.

[0113] T PX T PY T LX And T LY The definition remains unchanged. Therefore, the specific magnification of the 1000 micro-optical imaging system is:

[0114]

[0115] M is the method magnification of the micro-optical imaging system at 1000, and T is... L To focus on the arrangement distance of structure 1, T P θ is the arrangement distance of the micro-image 33, and θ is the second angle formed by the first direction and the third direction, or the third angle formed by the second direction and the fourth direction.

[0116] The specific dimensions of 3D depth of field are:

[0117] D = M * f

[0118] Where D is the stereo depth of field of the micro-optical imaging system 1000, and f is the focal length of the micro-focusing structure 1.

[0119] Combining the above formula, T LX T PX θ1 and θ1 determine the magnification M of the miniature image 33 in the first direction X. X and 3D depth of field D X T LY T PY θ2 determines the magnification M of the miniature image 33 in the second direction Y. Y and 3D depth of field D Y Similarly, M X M Y Both can be the same or different, and can be flexibly and independently designed in different sizes according to needs. Similarly, D X D Y The two can be the same or different, and can be designed flexibly and independently according to needs. Furthermore, since there is an angle between the first direction X and the third direction X', and an angle between the second direction Y and the fourth direction Y', the image 200 displayed by the overall micro-optical imaging system 1000 will rotate, producing a shaking effect.

[0120] In this embodiment of the invention, different TL and T P This combination can further enhance the imaging capabilities of the 1000 micro-optical imaging system.

[0121] In one example, T L and T P T is a constant. L and T P "Constant" means that the arrangement distance between the focusing structure 1 and the micro-image 33 is a fixed value, that is, the focusing structure 1 and the micro-image 33 are arranged at equal distances. At this time, the magnification M of the micro-optical imaging system 1000 is a fixed value, and the stereo depth of field D is also a fixed value. Figure 9 and Figure 10 This is a schematic diagram illustrating the imaging effect of a micro-optical imaging system 1000 according to different exemplary embodiments. If T L <T P This manifests as a three-dimensional levitation, and the image 200 displayed by the micro-optical imaging system 1000 has the same levitation height, such as... Figure 9 As shown. If T L >T P This manifests as a three-dimensional depression, and the depression depth of the image 200 displayed by the micro-optical imaging system 1000 is the same, such as... Figure 10 As shown.

[0122] In one example, T L and T P The distance between the microimage units in the microimage array can vary. Similarly, the distance between the focusing structure 1 in the microimaging structure array 100 can vary. Therefore, the focusing structure 1 and the microimage 33 are arranged with variable distances.

[0123] Alternatively, dynamic changes can also be represented as T. L and T P One is a constant, and the other is a variable. That is, one of the focused structure 1 and the micro-graphic 33 is arranged with equal spacing, and the other is arranged with variable spacing.

[0124] Optionally, the arrangement distance of the micro-images 33 in the first and second directions varies according to a preset method. The arrangement distance of the focusing structure 1 in the third and fourth directions varies according to a preset method. The arrangement distance T of the focusing structure 1 in the third and fourth directions LX and T Ly They can all be constants, or they can all be variables, or one can be a constant and the other a variable. The arrangement distance T in the first and second directions of the miniature diagram 33... PX and T Py They can all be constants or both be variables, or one can be a constant and the other a variable.

[0125] Based on the formulas for magnification and depth of field, by configuring the arrangement distance between the miniature graphics 33 and the focusing structure 1, different areas of the micro-optical imaging system 1000 can achieve different magnifications and depths of field, thus producing different visual effects. For example... Figure 24 As shown, the arrangement distance of the micro-images 33 and the arrangement distance of the focusing structure 1 are configured such that the image 200 is stereoscopically raised and the depth of field changes continuously and linearly. Figure 25 As shown, the arrangement distance of the micro-images 33 and the arrangement distance of the focusing structure 1 are configured as follows: the image 200 is three-dimensionally raised and the depth of field changes to a spherical shape.

[0126] In this embodiment of the invention, the imaging effect of the micro-optical imaging system 1000 can be further enriched by setting the size and shape of the micro-graphics 33.

[0127] In one example, a unique macroscopic image 200 can be achieved by setting different shapes and sizes of the micro-images 33. Figure 26 and Figure 27 This is a schematic diagram illustrating the imaging effect of a micro-optical imaging system 1000 according to other exemplary embodiments. The shape and size of the micro-image 33 are set (e.g., ...). Figure 26 As shown), it can achieve the following: Figure 27 The only stereoscopic macroscopic image 200 shown is displayed.

[0128] In one example Figure 28 and Figure 29 This is a schematic diagram illustrating the imaging effect of a micro-optical imaging system 1000 according to other exemplary embodiments. For example... Figure 28 As shown, when the area covered by the microtext 33 is larger than the area of ​​the transverse cross-section of the microlens monomer, cross-linking will occur in the microtext 33. In this case, to avoid cross-linking of the microtext 33, as follows... Figure 29 As shown, only the portion of the miniature image 33 corresponding to the cross-sectional area of ​​the microlens needs to be retained. In this way, interference between the image information presented by different individual microlenses is avoided, thus optimizing the imaging effect of the micro-optical imaging system 1000.

[0129] In one example Figure 30 This is a schematic diagram illustrating the imaging effect of a micro-optical imaging system 1000 according to another exemplary embodiment, such as... Figure 30 As shown, the graphic information in the micro-graphic array 33 is planar graphic information projected from a spatial three-dimensional graphic through each microlens unit. In this way, the image 200 presented by the micro-optical imaging system 1000 is a spatial three-dimensional image 200.

[0130] In practical use, such as Figure 31 As shown, an optical channel 2 connects two focusing structures 1. Figure 32 As shown, optical channels 2 and focusing structures 1 are uniformly distributed. The arrangement distance between adjacent optical channels 2 and adjacent focusing structures 1 (including the arrangement distance of focusing structures 1 on the same optical channel 2 and the arrangement distance of adjacent focusing structures 1 on different optical channels 2) can be flexibly configured to achieve different display effects. In another example, Figure 33 This is a schematic diagram of a micro-imaging structure array 100 according to another exemplary embodiment. Figure 33 As shown, one focusing structure 1 is set on one optical channel 2, and the three focusing structures 1 adopt a regular hexagonal structure. Of course, other numbers and shapes of focusing structures 1 can be set on the optical channel 2, and there is no specific limitation on the arrangement of focusing structures 1 on the same optical channel 2.

[0131] Example 2

[0132] Based on the micro-optical imaging system 1000 provided in the above embodiments, Embodiment 2 of this utility model also provides a method for preparing the micro-optical imaging system 1000. Figure 36 The fabrication process flow diagram for the 1000 micro-optical imaging system is as follows: Figure 36 As shown, the preparation method includes:

[0133] Step S10: Use a molding plate to copy the micro-images 33 to one side of the light-transmitting spacer layer to form an array of micro-images 33; wherein, the arrangement density of the micro-images 33 in at least a portion of the area on the molding plate is different from that in other areas;

[0134] Step S11: Fabricate a micro-imaging structure array 100 that matches the micro-image array 33 on the opposite side of the light-transmitting spacer layer.

[0135] Before step S10, the preparation method also includes:

[0136] Step S100: Convert the variable density micro-text array 33 into a concave-convex structure;

[0137] Step S200: Make the concave-convex structure into a molding plate.

[0138] Before step S100, the preparation method further includes:

[0139] Step S1000: Create a full-density array of miniature images 33; specifically, in the full-density array of miniature images 33, the arrangement and spacing of adjacent miniature images 33 are based on the preset magnification and preset depth of field configuration of the micro-optical imaging system 1000. Using the above method, different effects of stereoscopic and depth variations in the magnified images can be obtained by changing the preset magnification and preset depth of field.

[0140] Step S2000: Perform a variable density processing on the full-density array of micro-text 33 to obtain a variable-density array of micro-text 33.

[0141] In this embodiment, full-density arrangement means that each placement position 32 is equipped with a micro-image 33. Variable-density micro-image 33 means that some placement positions 32 are equipped with micro-image 33, while others are not. After masking, full-density arrangement means that the effective value retained by each micro-image 33 is the maximum value; variable-density arrangement means that due to the presence of black pixels, the effective value retained by some micro-image 33 varies.

[0142] Step S2000 specifically includes:

[0143] Step S20001: Create a grayscale image, wherein the grayscale value at each position of the grayscale image is adapted to the brightness of the enlarged image.

[0144] Step S20002: Convert the grayscale image to a black and white raster image. Figure 4 A grayscale image uses the size and number of black and white pixels to represent the grayscale value at each location. Specifically, a grayscale image is a representation of an image, using different shades of gray to display the brightness information of the image. Its brightness levels are typically 256, displayed as grayscale levels ranging from the darkest black (level 0) to the brightest white (level 255). The grayscale image is converted into a corresponding black and white pixel array using image processing software such as Photoshop. Figure 4 .

[0145] Using black and white dot matrix Figure 4 The full-density micro-text 33 array is masked, and the micro-text 33 parts corresponding to white pixels are retained, while the micro-text 33 parts corresponding to black pixels are removed.

[0146] Step S2000 further includes: directly deleting a portion of the micro-text 33 in the full-density array of micro-text 33.

[0147] Step S100 specifically includes:

[0148] Step S1001: Convert the file of the variable density micro-image array 33 into a photolithography file;

[0149] Step S1002: Use photolithography equipment to convert the photolithography file into a raised or recessed structure.

[0150] Example 3

[0151] like Figure 1As shown, this embodiment also provides a molding plate, which is used to copy the micro-images 33 to one side of the light-transmitting spacer layer to form an array of micro-images 33; wherein, the arrangement density of the micro-images 33 in at least a portion of the areas on the molding plate is different from that in other areas. Specifically, the micro-imaging structure array 100 realizes magnified imaging of the micro-images 33, so that the details of the micro-images 33 can be clearly displayed. The brightness of at least two magnified images is different and / or the brightness of at least two areas of the magnified images is different, thereby increasing the distinguishing dimension of the magnified images, so that the magnified images can not only be distinguished in shape, but also have distinguishability in brightness, thus increasing the difficulty of identifying anti-counterfeiting marks. In addition, by adopting the above form, controlling the brightness increases the diversity of presentation.

[0152] It should be specifically noted that the aforementioned micro-text 33 array, where the arrangement density of micro-text 33 differs from other regions in at least some areas, refers to the fact that for the micro-text 33 array, the arrangement density of micro-text 33 differs in at least two regions. The specific two regions can be selected based on actual needs and are not specifically limited here.

[0153] Example 4

[0154] This embodiment provides an anti-counterfeiting product that uses the micro-optical imaging system 1000 of Embodiment 1. Specifically, the micro-imaging structure array 100 achieves magnified imaging of the micro-image 33, allowing the details of the micro-image 33 to be clearly displayed. At least two magnified images have different brightness levels and / or at least two areas of the magnified image have different brightness levels, thereby increasing the distinguishability of the magnified image. This allows the magnified image to be distinguishable not only in shape but also in brightness, increasing the difficulty of identifying the anti-counterfeiting mark. Furthermore, by employing the above method, controlling the brightness increases the diversity of presentation.

[0155] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A micro-optical imaging system, characterized in that, The micro-optical imaging system includes: Light-transmitting spacer layer; A micro-imaging structure array, comprising several micro-imaging structures, is disposed on one side of a light-transmitting spacer layer; A micro-image array, containing several micro-images, is set on the opposite side of the light-transmitting spacer layer; The micro-imaging structure array magnifies the micro-image array to form magnified images, and the effective values ​​of the micro-images retained in at least some regions of the micro-image array are different.

2. The micro-optical imaging system as described in claim 1, characterized in that, The light-transmitting spacer layer includes an optical channel, which is connected to the micro-image array. The micro-imaging structure array is connected to the side of the optical channel away from the micro-image array.

3. The micro-optical imaging system as described in claim 1, characterized in that, The light-transmitting spacer layer includes an optical channel and a substrate layer connected together. The micro-imaging structure array is connected to the side of the optical channel away from the substrate layer, and the micro-image array is connected to the side of the substrate layer away from the optical channel.

4. The micro-optical imaging system as described in claim 3, characterized in that, Several of the micro-images are distributed along a first direction and a second direction, the first direction and the second direction intersecting; The micro-imaging structure array is distributed along a third direction and a fourth direction, wherein the third direction is parallel to the first direction and the fourth direction is parallel to the second direction; or... The micro-imaging structure array is distributed along a third direction and a fourth direction, the third direction forming a second angle with the first direction, and the fourth direction forming a third angle with the second direction.

5. The micro-optical imaging system as described in claim 1, characterized in that, The arrangement and spacing of adjacent micro-images are based on the preset magnification and preset depth of field configuration of the micro-optical imaging system.

6. The micro-optical imaging system as described in claim 1, characterized in that, The micro-image array includes at least two stacked image layers, on which the micro-images are disposed.

7. An anti-counterfeiting product, characterized in that, The anti-counterfeiting product uses the micro-optical imaging system as described in any one of claims 1-6.

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