Optical anti-counterfeiting device with hidden information

Abstract

The utility model provides an optical anti-fake device with hidden information. The optical anti-fake device comprises a base material and a composite micro-nano structure layer arranged on one side of the base material. The composite micro-nano structure layer comprises a main structure area and a hidden information structure area, the main structure area comprises a plurality of main micro-nano structures, the hidden information structure area comprises an imaging structure with a target phase distribution diagram and a non-imaging area, and the area ratio of the main structure area to the hidden information structure area is larger than 1; the main structure region and the hidden information structure region have a mutual overlapping region. The imaging structure of the hidden information structure is ingeniously hidden in the main structure, the information hiding effect is achieved, and the anti-fake function is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of anti -fake technology especially, it relates to an optical anti -fake device with hidden information. BACKGROUND

[0002] Among the existing anti -fake technologies, the technologies with hidden anti -fake effect include invisible watermarking and computer holography. Invisible watermarking needs to be observed under a specific large viewing angle, and the hiding effect is general, belonging to first-line anti -fake. Computer holography technology calculates and manufactures encrypted patterns into micro-nano structures, which present encrypted patterns under a point light source, belonging to second-line anti -fake. Second-line anti -fake refers to anti -fake technologies that need to use some simple tools and instruments such as ruler, magnifying glass, violet light, magnetic head or point (check) cash machine, point light source lamp, and identify through methods such as length measurement, magnifying observation, magnetic detection, fluorescence, point light source irradiation. Second-line anti -fake is mainly used by bank system personnel engaged in cash receiving and paying posts, so it is also called professional anti -fake technology.

[0003] The computer holographic pattern makes the hologram of the reconstructed image obtainable through computer-related algorithms, so the structure data can be generated only through large data calculation, and the picture processing has data volume limitation, so it cannot be applied to large-format effect.

[0004] The phase modulation pattern obtained by the existing computer holographic technology has a dense structure arrangement, which cannot be combined with other non-imaging micro-nano structures (such as relief, dynamic light and shadow effect), and cannot achieve the visual hiding effect. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims to provide an optical anti -fake device with hidden information, which ingeniously hides the display effect of the imaging structure of the hidden information structure in the display effect of the main micro-nano structure, realizes the effect of hidden information, has anti -fake function, and only presents imaging effect under a specific light source, and is a novel anti -fake technology.

[0006] The utility model provides an optical anti -fake device with hidden information, including base material and the composite micro-nano structure layer who sets up in the one side of base material, the composite micro-nano structure layer includes main structure area and hidden information structure area, the main structure area includes plurality of main micro-nano structure, the hidden information structure area includes the imaging structure and non -imaging area with target phase distribution diagram, the area ratio of main structure area with hidden information structure area is greater than 1, the main structure area with hidden information structure area has mutual overlapping area.

[0007] Specifically, the main micro-nano structure includes at least one of relief structure, light and shadow texture structure, grating structure, lens structure, microlens structure and superlens.

[0008] Specifically, the cross section of the main micro-nano structure is arched, or is ramp-shaped, or is sinusoidal, and the depth of the main micro-nano structure ranges from 0.1 μm to 5 μm.

[0009] Specifically, the non-imaging area of the hidden information structure area in the overlapping area is filled with the main micro-nano structure, and the area ratio of the main micro-nano structure to the imaging structure in the overlapping area is greater than 1.

[0010] Specifically, the target phase distribution map is configured to be formed by the target light field after the initial imaging structure, and the target intermediate image is reversely propagated to the phase distribution map formed on the surface of the initial imaging structure when the initial imaging structure is penetrated, and the phase distribution map formed on the surface of the initial imaging structure is intersected or tangent to the phase distribution map of the initial imaging structure.

[0011] Specifically, the initial imaging structure includes a plurality of imaging units arranged periodically along at least one direction, and the imaging unit includes at least one of a nano-grating, a holographic lens, a micro-lens, a super-lens, and a Fresnel lens; and the shape of the imaging unit includes at least one of a circle, a square, a rectangle, and a honeycomb shape.

[0012] Specifically, the optical anti-counterfeiting device is reflective, and a reflective layer is arranged on the side of the composite micro-nano structure layer away from the base material, the thickness of the reflective layer ranges from 5 nm to 40 nm, the reflective layer can be a metal layer, and the metal layer includes aluminum; or the reflective layer can be a dielectric layer, and the dielectric layer includes zinc sulfide.

[0013] Specifically, the focal length of the imaging unit ranges from 100 μm to 500 μm, and the corresponding imaging distance ranges from 10 mm to 20 mm.

[0014] Specifically, the optical anti-counterfeiting device is transmissive, and a protective layer is arranged on the side of the composite micro-nano structure layer away from the base material.

[0015] Specifically, the focal length of the imaging unit is greater than or equal to 500 μm, the corresponding imaging distance is greater than or equal to 10 mm, and the projection distance ranges from 10 mm to 200 mm.

[0016] In summary, the optical anti-counterfeiting device with hidden information has the area ratio of the main structure region to the hidden information structure region greater than 1, so that the area ratio of the hidden information structure region can be reduced, and the hiding effect of the imaging structure is better. Further, the non-imaging region of the hidden information structure region in the overlapping region is filled with the main micro-nano structure, and the area ratio of the main micro-nano structure to the imaging structure in the overlapping region is greater than 1, so that the imaging structure is hidden in the main micro-nano structure, the visual hiding effect is achieved, and the possibility of finding the hidden information when the user directly views the optical anti-counterfeiting device under the daily light condition is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 is a top view of the optical anti-counterfeiting device in the first embodiment of the present application;

[0019] Figure 2 is a sectional view cut along the direction of the sectional line; Figure 1

[0020] Figure 3 is a structure diagram of the hidden information structure region in the first embodiment of the present application;

[0021] Figure 4 is a microscope macrograph of the composite micro-nano structure layer in the first embodiment of the present application;

[0022] Figure 5 is a visual effect diagram of the optical anti-counterfeiting device in the first embodiment of the present application under the daily light irradiation condition;

[0023] Figure 6 is a visual effect diagram of the optical anti-counterfeiting device in the first embodiment of the present application under the point light source irradiation condition;

[0024] Figure 7 is a sectional view of the optical anti-counterfeiting device in the second embodiment of the present application;

[0025] Figure 8 is a sectional view of another embodiment of the protective layer in the second embodiment of the present application;

[0026] Figure 9 is a visual effect diagram of the optical anti-counterfeiting device in the second embodiment of the present application under the daily light irradiation condition; ​

[0027] Figure 10 This is a visual effect diagram of the optical anti-counterfeiting device under point light source illumination in the second embodiment of this utility model;

[0028] Figure 11 This is a projection effect diagram of the optical anti-counterfeiting device under point light source illumination in the second embodiment of this utility model.

[0029] In the above-mentioned figures, the reference numerals for the embodiments of this utility model are as follows:

[0030] 100. Substrate;

[0031] 200. Main structural region; 210. Main micro / nano structure;

[0032] 300. Hidden information structure region; 310. Imaging structure; 320. Non-imaging region;

[0033] 400. Reflective layer;

[0034] 500. Protective layer. Detailed Implementation

[0035] This invention proposes an optical anti-counterfeiting device with hidden information. Specific embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0036] First Embodiment

[0037] like Figures 1 to 6 As shown, the first embodiment of the present invention provides an optical anti-counterfeiting device with hidden information, including a substrate 100 and a composite micro-nano structure layer disposed on one side of the substrate 100; the composite micro-nano structure layer includes a main structure region 200 and a hidden information structure region 300, the main structure region 200 includes a plurality of main micro-nano structures 210, the hidden information structure region 300 includes an imaging structure 310 with a target phase distribution map and a non-imaging region 320, the area ratio of the main structure region 200 to the hidden information structure region 300 is greater than 1, and the main structure region 200 and the hidden information structure region 300 have overlapping areas.

[0038] The ratio of the area of ​​the main structure region 200 to the area of ​​the hidden information structure region 300 is greater than 1, which can reduce the area ratio of the hidden information structure region 300 and make the hiding effect of the imaging structure 310 better.

[0039] Composite micro / nano structure layers such as Figures 1 to 4 As shown, specifically, this embodiment includes two structural regions: a main structural region 200 and a hidden information structural region 300. The main structural region 200 is rectangular in shape, i.e. Figure 1The shape of the hidden information structure area 300 is "50" in the rectangular area in the figure. The area ratio of the main structure area 200 to the hidden information structure area 300 is greater than 1, and the hidden information structure area 300 is contained in the main structure area 200, that is, the hidden information structure area 300 is contained in the main structure area 200, so the overlapping area in this embodiment is the hidden information structure area 300, that is, the two number areas of "50".

[0040] In other embodiments, the main structure area 200 and the hidden information structure area 300 are partially intersected.

[0041] In this embodiment, the main micro-nano structure 210 includes at least one of a relief structure, a light and shadow texture structure, a grating structure, a lens structure, a micro-lens structure, and a super-lens.

[0042] In this embodiment, the cross section of the main micro-nano structure 210 is arched, or is sloped, or is sinusoidal, and the depth of the main micro-nano structure 210 ranges from 0.1 μm to 5 μm.

[0043] In this embodiment, the main micro-nano structure 210 is filled in the non-imaging area 320 of the hidden information structure area 300 in the overlapping area, and the area ratio of the main micro-nano structure 210 to the imaging structure 310 in the overlapping area is greater than 1. The main structure area 200 presents a main display effect; the hidden information structure area 300 is a hidden information display effect area, and the imaging structure 310 with the phase distribution map presents a hidden information display effect. The advantage of this design is that the imaging structure 310 is hidden in the main micro-nano structure 210, achieving the effect of visual hiding and reducing the possibility of users discovering hidden information when directly viewing the optical anti-counterfeiting device under normal light conditions.

[0044] In this embodiment, the target phase distribution map is configured to be formed by the target intermediate image formed by the target light field through the initial imaging structure 310, and the target intermediate image is reversely propagated to the phase distribution map formed on the surface of the initial imaging structure 310 when the initial imaging structure 310 is penetrated, and the phase distribution map is formed by the intersection or tangency of the phase distribution map of the initial imaging structure 310.

[0045] Specifically, the target phase distribution map can represent a phase distribution map after phase information of a target light field propagating to the initial imaging structure 310 is applied to the initial imaging structure 310, and the target phase distribution map can be used to obtain an imaging effect of three-dimensional floating imaging, floating up, and sinking. Further, the target phase distribution map can be formed by the target intermediate image formed by the target light field passing through the initial imaging structure 310, and the target intermediate image propagating reversely to the phase distribution map formed on the surface of the initial imaging structure 310 when passing through the initial imaging structure 310 and being in contact with or tangent to the phase distribution map of the initial imaging structure 310. In this way, it is beneficial to realize achromatic spatial light field imaging and ensure the clarity of imaging.

[0046] In the embodiment, the initial imaging structure 310 includes a plurality of imaging units arranged periodically along at least one direction, and the imaging unit includes at least one of a nano-grating, a holographic lens, a micro-lens, a super-lens, and a Fresnel lens. The shape of the imaging unit includes at least one of a circular shape, a square shape, a rectangular shape, and a honeycomb shape.

[0047] In the embodiment, the imaging structure 310 with the phase distribution map can display at least one of a planar spatial image, a stereoscopic image, and a spatial projection image. The imaging structure 310 needs to use a point light source to assist in imaging. When a user uses a point light source to illuminate the optical anti-counterfeiting device, the effect is presented. However, the hidden information cannot be seen by the naked eye under normal light conditions.

[0048] In the embodiment, the optical anti-counterfeiting device is a reflection type, and a reflection layer 400 is arranged on the side of the composite micro-nano structure layer away from the base material 100. The thickness of the reflection layer 400 is in the range of 5 nm to 40 nm. The reflection layer 400 can be a metal layer, and the metal layer includes aluminum. Alternatively, the reflection layer 400 can be a dielectric layer, and the dielectric layer includes zinc sulfide.

[0049] The thickness of the reflection layer 400 can be 5 nm, 10 nm, 20 nm, 30 nm, or 40 nm. The reflection layer 400 is shaped with the composite micro-nano structure layer.

[0050] In the embodiment, the focal length of the imaging unit is in the range of 100 μm to 500 μm, and the corresponding imaging distance is in the range of 10 mm to 20 mm.

[0051] That is, under the irradiation of the point light source, the observation point and the point light source are on the same side, and at this time, the floating up or sinking image can be seen. The distance between the floating up or sinking image and the base material 100 is the imaging distance. The image seen from the observation point is above the base material 100, which is the floating up image. The image seen from the observation point is below the base material 100, which is the sinking image.

[0052] In this embodiment, the substrate 100 can be made of films such as PC, PET, and PVT, or paper, and its thickness is not limited. Optionally, a release film can be provided between the substrate 100 and the composite micro / nano structure layer, which helps to quickly peel off the micro / nano structure of the composite micro / nano structure layer. Then, an adhesive layer, such as OCA adhesive, is used to bond the peeled micro / nano structure to the surface of the product, making the product deplasticized and more environmentally friendly.

[0053] like Figure 5 and Figure 6 As shown, under normal light, the visual effect is a platinum embossed peony flower. When the pattern is illuminated by a point light source such as a mobile phone flash, the number "50" appears on the peony flower, floating 10mm above the surface. In this embodiment, the "50" pattern is hidden within the embossed peony flower pattern, and the specific pattern is presented through simple lighting, making it a more convenient and novel anti-counterfeiting method.

[0054] Specifically, the main micro / nano structure 210 forms a platinum relief peony effect, while the imaging structure 310, which hides the information structure, presents an upward-floating image of the number "50". The main micro / nano structure 210 is a slope structure with different periods, and the imaging unit of the imaging structure 310 with a phase distribution map has a focal length of 200 μm, corresponding to an imaging distance of 10 mm. This means that it presents an upward-floating effect at the observation point, and the distance between the upward-floating image and the substrate 100 is 10 mm.

[0055] In this embodiment, the imaging structure 310 of the hidden information structure region 300 is an imaging structure 310 with a phase distribution map, which can present a planar spatial image or a three-dimensional image, or a combination of the two.

[0056] Second Embodiment

[0057] like Figures 7 to 11 As shown, the second embodiment of this utility model provides an optical anti-counterfeiting device with hidden information. Its structure is generally the same as that of the first embodiment. The difference is that the optical anti-counterfeiting device in this embodiment is a transmissive type, without a reflective layer 400, and a protective layer 500 is provided on the side of the composite micro-nano structure layer away from the substrate 100.

[0058] After illumination by a point light source, the image can be seen below the substrate 100 at the observation point, that is, as a sunken image. The display effect presented by the main micro / nano structure 210 is platinum sand dots (similar to a frosted display effect). The imaging structure 310 with the target phase distribution presents both a sunken image "50" and a projected image "50". In this embodiment, the point light source and the observation point can be on the same side or on opposite sides.

[0059] In the embodiment, the optical anti-counterfeiting device is a transmission type, and a protective layer 500 is arranged on the side of the composite micro-nano structure layer away from the base material 100.

[0060] Specifically, as shown in Figure 7 , the protective layer 500 can be shaped with the composite micro-nano structure layer; as shown in Figure 8 , the protective layer 500 can also be directly coated on the composite micro-nano structure layer, and the upper surface is flat. The protective layer 500 is used for protecting the structure.

[0061] In the embodiment, the focal length of the imaging unit is greater than or equal to 500 μm, the corresponding imaging distance is greater than or equal to 10 mm, and the projection distance is in the range of 10 mm-200 mm.

[0062] That is, under the irradiation of the point light source, a number “50” 10 mm below the base material 100 can be seen from the observation point. Meanwhile, a receiving screen is arranged 50 mm away from the base material 100, and the number “50” can also be seen on the receiving screen, that is, the projection distance is specifically preferably 50 mm.

[0063] That is, under the irradiation of the point light source, the observation point and the point light source can be on the same side or on different sides, at which time the floating or sinking image can be seen, and the distance between the floating or sinking image and the base material 100 is the imaging distance. The image seen from the observation point is above the base material 100, which is the floating image; the image seen from the observation point is below the base material 100, which is the sinking image. When the sinking image is seen from the observation point, a receiving screen is arranged at the extension of the observation point and the base material 100, and an image is also displayed on the receiving screen, and the distance between the image on the receiving screen and the base material 100 is the projection distance.

[0064] As shown in Figure 10 , under the irradiation of the point light source, the optical anti-counterfeiting device of the embodiment presents a sinking number “50” 10 mm below the optical anti-counterfeiting device. Figure 11 As shown in Figure 10 , in addition to the effect of Figure 10 , under the irradiation of the point light source, the optical anti-counterfeiting device of the embodiment is placed at a position 50 mm away from the desktop, and a projected number “50” is presented on the desktop, and the desktop is the receiving screen.

[0065] In summary, the optical anti-counterfeiting device with hidden information provided by the utility model has an area ratio of the main structure area 200 to the hidden information structure area 300 greater than 1, can reduce the area ratio of the hidden information structure area 300, and makes the imaging structure 310 have a hidden effect.

[0066] Further, by filling the non-imaging area 320 of the hidden information structure area 300 in the overlapping area with the main micro-nano structure 210, the area ratio of the main micro-nano structure 210 to the imaging structure 310 in the overlapping area is greater than 1, further strengthening the hiding effect.

[0067] The visual hiding effect is achieved, and the possibility of finding the hidden information by a user when directly viewing the optical anti-counterfeiting device under daily light conditions is reduced.

[0068] When the optical anti-counterfeiting device is reflective, a reflective layer 400 is arranged on the side of the composite micro-nano structure layer away from the base material 100.

[0069] When the optical anti-counterfeiting device is transmissive, a protective layer 500 is arranged on the side of the composite micro-nano structure layer away from the base material 100.

[0070] The imaging structure 310 is a wideband spatial imaging structure 310, and the wideband spatial imaging structure 310 includes at least one of a planar spatial image type imaging structure 310, a stereoscopic image type imaging structure 310, and a spatial projection image type imaging structure 310.

[0071] When the composite micro-nano structure layer is reflective anti-counterfeiting, the wideband spatial imaging structure 310 includes at least one of a planar spatial image type imaging structure 310 and a stereoscopic image type imaging structure 310.

[0072] When the composite micro-nano structure layer is transmissive anti-counterfeiting, the wideband spatial imaging structure 310 is a spatial projection image type imaging structure 310.

[0073] It should be noted that the embodiments described in the present application are only a part of the embodiments of the present application, rather than all the embodiments.

[0074] In the description of the utility model, unless another definite provision and limitation, the term "arrange", "install", "connect" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can indirectly connect through the intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0075] The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, or is the orientation or positional relationship when the utility model product is usually placed, and is merely for the convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0076] The terms "first", "second", "third" and the like are merely for distinguishing similar attributes, and do not indicate or imply relative importance or a particular order.

[0077] The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to containing the listed elements, other elements not explicitly listed can also be contained.

Claims

1. An optical security device having hidden information, characterized in that, The composite micro-nano structure layer includes a main structure region and a hidden information structure region, the main structure region includes a plurality of main micro-nano structures, the hidden information structure region includes an imaging structure with a target phase distribution map and a non-imaging region, and the area ratio of the main structure region to the hidden information structure region is greater than 1.

2. The optical security device of claim 1, wherein, The main micro-nano structure includes at least one of a relief structure, a light and shadow texture structure, a grating structure, a lens structure, a micro-lens structure, and a super-lens.

3. The optical security device of claim 1, wherein, The cross section of the main micro-nano structure is arched, or is a slope type, or is a sinusoidal type, and the depth of the main micro-nano structure ranges from 0.1 μm to 5 μm.

4. The optical security device of claim 1, wherein, The non-imaging region of the hidden information structure region in the overlapping region is filled with the main micro-nano structure, and the area ratio of the main micro-nano structure to the imaging structure in the overlapping region is greater than 1.

5. The optical security device of claim 1, wherein, The target phase distribution map is configured to form a target intermediate image by a target light field through an initial imaging structure, and the target intermediate image is reversely propagated to a phase distribution map formed on the surface of the initial imaging structure when the initial imaging structure is penetrated, and the phase distribution map is intersected or tangent to the phase distribution map of the initial imaging structure.

6. The optical security device of claim 5, wherein, The initial imaging structure includes a plurality of imaging units arranged periodically along at least one direction, and the imaging unit includes at least one of a nano-grating, a holographic lens, a micro-lens, a super-lens, and a Fresnel lens; and the shape of the imaging unit includes at least one of a circular shape, a rectangular shape, and a honeycomb shape.

7. The optical security device of claim 6, wherein, The optical anti-counterfeiting device is a reflection type, a reflective layer is arranged on the side of the composite micro-nano structure layer away from the substrate, the thickness of the reflective layer ranges from 5 nm to 40 nm, the reflective layer is a metal layer, and the metal layer includes aluminum; or the reflective layer is a dielectric layer, and the dielectric layer includes zinc sulfide.

8. The optical security device of claim 7, wherein The focal length of the imaging unit ranges from 100 μm to 500 μm, and the corresponding imaging distance ranges from 10 mm to 20 mm.

9. The optical security device of claim 6, wherein, The optical anti-counterfeiting device is a transmission type, and a protective layer is arranged on the side of the composite micro-nano structure layer away from the substrate.

10. The optical security device of claim 9, wherein, The focal length of the imaging unit is greater than or equal to 500 μm, the corresponding imaging distance is greater than or equal to 10 mm, and the projection distance ranges from 10 mm to 200 mm.

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