A micro-nano structure card and its usage method

Abstract

The present invention provides a micro-nano structured card, which comprises a card body made of a plurality of transparent or semi-transparent plastic film sheets. One surface of the plastic film sheet is a structured surface, and its back surface is an unstructured surface. A grating micro-nano structure formed by hot pressing or UV transfer is provided on the structured surface, and distinguishing information is carried on the grating micro-nano structure, and the content of the distinguishing information on each card is different. A plurality of cards can form a set of playing cards, or can form a set of cards with logically related distinguishing features, so as to increase the interest of the cards, and the anti-peeping property of the cards can also be improved by various means. The present invention also provides a method for using the above-mentioned micro-nano structured card.

Description

Technical Field

[0001] The present invention belongs to the technical field of cards, and particularly relates to a micro-nano structure card and a using method thereof. Background Art

[0002] In the prior art, it is a mature technology to form a card on a transparent film by making a micro-nano structure. The micro-nano structure on the card can clearly show the pattern composed of micro-nano under irradiated light. When there is no irradiated light, the surface of the card with the micro-nano structure presents a matte visual state, and the place without the micro-nano structure looks transparent. Such micro-nano structure cards are generally used as single components in the prior art.

[0003] In the prior art, the research in this technical field mainly focuses on the imaging effect of the micro-nano structure on the card under irradiated light, and rarely pays attention to the visual color difference of the card observed by the naked eye under non-irradiated conditions.

[0004] Existing game cards, such as playing cards or board game cards, etc., print patterns on paper card surfaces, with a single form. In order to increase the interest of the game, exploration has been carried out in many aspects. However, no one has thought of designing the patterns on the cards with micro-nano structures on transparent plastic film sheets. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a micro-nano structure card to increase the interest of game cards or sets of cards made with it.

[0006] Further, the purpose of the present invention is to provide a micro-nano structure card with the characteristic of all-round anti-peeping.

[0007] Another purpose of the present invention is to provide a using method of the above micro-nano structure card.

[0008] The first technical solution adopted by the present invention to solve its technical problems is:

[0009] A micro-nano structure card includes a card body made of a plurality of transparent or semi-transparent plastic film sheets. One side surface of the plastic film sheet is a structured surface, and its back surface is a non-structured surface. A grating micro-nano structure formed by hot pressing or UV transfer is provided on the structured surface. Difference information is carried on the grating micro-nano structure, and the content of the difference information on each card is different, constituting a set of game cards.

[0010] The second technical solution adopted by the present invention to solve its technical problems is:

[0011] A micro-nano structure card, which includes a card body made of a number of transparent or semi-transparent plastic film sheets. One surface of the plastic film sheet is a structured surface, and its back surface is an unstructured surface. A micro-nano structure is provided on the structured surface, and identification information is carried on the micro-nano structure. The micro-nano structure card includes a number of cards. The identification features carried on the micro-nano structures on the structured surfaces of each card are different, but the patterns formed by the identification features on each card are logically related in content, so that all the cards form a set of cards.

[0012] In the above two technical solutions, further, there are the following preferred measures:

[0013] For each card with different identification features of the micro-nano structure on each card in a set of cards, there is no difference visible to the naked eye under ordinary light, making it impossible to distinguish; and / or, under ordinary light and visible to the naked eye, it has 360-degree full-angle anti-peeping, that is, the matte micro-nano structures shown on all the cards in a set of cards are visually the same at any angle.

[0014] The ordinary light is light that is not irradiation light, such as natural light or illumination light, etc.

[0015] The micro-nano structure is a diffractive optical element (Diffractive Optical Elements, abbreviated as DOE) or a holographic diffractive optical element (Holographic Diffractive Optical Elements, abbreviated as HDOE).

[0016] The plastic film sheet is made of colored or colorless transparent material.

[0017] The micro-nano structure on the structured surface can be a micro-structure or a nano-structure.

[0018] The unit size of the micro-nano structure on the structured surface is within 2 mm × 2 mm, and this unit is arranged repeatedly on the structured surface of the card.

[0019] Furthermore, the unit size of the micro-nano structure on the structured surface is within (0.5~2) mm × (0.5~2) mm.

[0020] The micro-structure on the card is arranged repeatedly on the card, so that when a point light source is irradiated on the card during use, the identification features thereon, that is, a specific pattern therein, can be presented.

[0021] The card set can constitute a set of game cards, such as a deck of playing cards, or a set of board game cards, such as a deck of Three Kingdoms board game cards, or other game cards. In addition, the card set can also be a set of cards with related content, such as a set of 108 cards depicting pictures of the 108 generals in Water Margin with micro-nano structures, or 12 pictures depicting the Twelve Beauties of Jinling in Dream of Red Mansions, etc. In sales, they can be sold as a set, such as playing cards, etc., or they can be sold separately, such as selling a set of cards of the Twelve Beauties of Jinling in batches in commercial promotions.

[0022] Preferably, the structure surface is provided with a micro-nano structure formed by heat pressing, UV transfer or nano-imprinting. The texture of the micro-nano structure is determined by the pattern design and can be symmetrical, such as a symmetrical pattern such as a playing card, in which case the micro-nano structure is symmetrical, or it can be asymmetrical.

[0023] Preferably, the micro / nano structure on the structural surface is a 3D micro / nano structure.

[0024] When using micro-nano structures (DOE) to make game cards, if the conventional method is followed, that is, the distinguishing features carried by the micro-nano structures on each card are different, although the micro-structure (DOE) has a certain anti-peeping performance, when viewed with the naked eye under normal light without illumination, the cards have different patterns with different complexities, and will show different visual matte color differences. Because of the visual matte color difference of such cards, players will guess the size of the cards based on the different color differences of the cards, which will affect the fairness of the game, making the cards provided by the present invention inconvenient to use as game cards.

[0025] Therefore, the cards with different distinguishing features can be viewed with the naked eye under ordinary light, and are 360-degree anti-peeping, that is, the complexity of the patterns on the cards is different but the matte (sub-surface) is the same, which is the best feature for especially gaming cards.

[0026] In order to achieve 360° all-round privacy protection for the cards provided by the present invention, the etching depth of the micro-nano structure on each card, the number of steps formed by the number of photolithography times, the visual color difference of the microstructure changed by the coating, etc. can be adjusted. Preferably, the adjustment means can be:

[0027] Method 1: Adjusting the etching depth of the photolithography of the micro-nanostructure.

[0028] In a deck of cards, the etching depth of the micro-nanostructure on each card is different.

[0029] The etching depth of the micro-nano structure varies according to the complexity of the patterns on each card. The etching depth of the micro-nano structure on the card with a simpler pattern is deeper, and the etching depth of the micro-nano structure on the card with a more complex pattern is shallower.

[0030] The etching depth on the card is between 0.1 and 3 microns.

[0031] Measure 2: Adjust the etching order of the micro-nano structure lithography.

[0032] There are two measures:

[0033] Measure 1: The order of the micro-nano structure on each card in a set of cards is the same. For example, it can be the second order, or the fourth order, or the eighth order,.... When the order of the micro-nano structure on each card is the same, the etching depth of the order formed by subsequent lithography, such as the second and third lithographies, decreases.

[0034] Measure 2: The orders of the micro-nano structures on each card in a set of cards are not all the same.

[0035] The etching order of the micro-nano structure on the structural surface of each card is not the same according to the complexity of the card pattern.

[0036] Specifically, the order is reduced for the more complex pattern and increased for the simpler pattern.

[0037] The micro-nano structure on the structural surface can be formed by lithography between 1 and 5 times, forming a micro-nano structure of the second order, fourth order, eighth order, sixteenth order or thirty-second order. Preferably, it is formed by 1 to 3 times of lithography, forming a micro-nano structure of the second order, fourth order and eighth order.

[0038] Through the above adjustments, it can be ensured that except under the irradiation light, the difference in the matte surface generated by the micro-nano structure on the structural surface cannot be seen on the card.

[0039] Measure 3: Adjust the color of the plastic film, that is, the plastic film is made of a colored transparent material.

[0040] By making the card with a colored transparent plastic film, the light transmittance of the colored transparent material is reduced, and the visual color difference can also be reduced, so that the difference in the matte surface caused by the different complexity of the patterns on the card is improved.

[0041] Measure 4: Set a coating layer on the plastic film.

[0042] That is, a coating layer is set on the plastic film to change the visual color difference of the card. The coating layer is preferably a colored transparent coating.

[0043] Preferably, the coating is set, and the light transmittance parameter of the coating film layer is 20 - 90% to adjust the visual color difference of each card.

[0044] Preferably, the coating material includes aluminum, or silver, or gold, or platinum, or nickel, etc.

[0045] The coating layer can be provided on the structural surface of the plastic film, or on the non-structural surface, but is preferably provided on the structural surface.

[0046] The above several adjustment means can be used alone, or two or more means can be combined for use.

[0047] Based on the above technical solutions, the following preferred embodiments can also be provided:

[0048] In another preferred embodiment, a first printed pattern is provided on the non-structural surface of the plastic film.

[0049] In another preferred embodiment, a part of the non-structural surface of the plastic film is provided with a first printed pattern.

[0050] In another preferred embodiment, a part of the structural surface of the plastic film is provided with a second printed pattern.

[0051] In another preferred embodiment, the content of the second printed pattern is consistent with the content of the difference information.

[0052] The third technical solution adopted by the present invention to solve its technical problems is the usage method of the cards in the foregoing various solutions:

[0053] A usage method of a micro-nano structure card, which includes any one of the above micro-nano structure cards; looking at a light source through the plastic film to read the difference information; or, the light source irradiates on the plastic film to present the difference information.

[0054] The beneficial effects of the present invention are:

[0055] 1. The present invention creatively proposes to use micro-nano structures to form multiple cards with related or coherent patterns on a plastic film, make cards using a plastic film with micro-nano structures, set difference information on the micro-nano structures, and the content thereon can be seen through light source irradiation, adding a new form of playing cards or a set of cards, enriching the form of the cards, and also increasing the interest of this type of optical product.

[0056] 2. The present invention can make the cards indistinguishable from each other in a normal view and cannot be distinguished by adjusting the micro-nano structures on the cards with different degrees of pattern complexity in a set of cards, or making the card body with a colored transparent plastic film, or making a coating layer on the card body, or a combination of several means, and the difference information can only be read through a light source, making the cards provided by the present invention 360° full-angle anti-peeping cards.

[0057] 3. The cards provided by the present invention can print patterns on the non-structural surface of the cards, which also enriches the forms of the cards; partial patterns can also be printed on the structural surface, with various forms and rich usage functions.

[0058] The following further elaborates on the present invention in conjunction with the accompanying drawings and embodiments; however, the micro-nano structure cards and their usage methods provided by the present invention are not limited to the embodiments. Description of the Drawings

[0059] Figure 1 It is a schematic structural diagram of a card with a single-layer micro-nano structure DOE formed by one-time photolithography in the first preferred embodiment of the micro-nano structure card provided by the present invention.

[0060] Figure 2 It is a schematic diagram showing the pattern on the card when the micro-nano structure card provided by the present invention is facing an LED lamp.

[0061] Figure 3 It is a schematic diagram showing the pattern on the card when the micro-nano structure card provided by the present invention is irradiated with an LED lamp.

[0062] Figure 4 It is a schematic structural diagram of the structural surface of the second preferred embodiment of the micro-nano structure card provided by the present invention.

[0063] Figure 5 It is a schematic structural diagram of the non-structural surface of the second preferred embodiment of the micro-nano structure card provided by the present invention.

[0064] Figure 6 It is a schematic structural diagram of the structural surface of the third preferred embodiment of the micro-nano structure card provided by the present invention. Detailed Embodiments

[0065] To facilitate understanding of the technical concept and inventive spirit of the present invention, different embodiments are given below for the present invention. However, these embodiments are only illustrative examples for explaining the technical concept of the present invention and are not used to limit the protection scope of the present invention. This is hereby explained in advance.

[0066] Embodiment 1:

[0067] See Figure 1As shown in the figure, a kind of micro-nano structured card of the present invention includes a card body made of several colorless or colored transparent or semi-transparent plastic film sheets 1, which constitutes a deck of playing cards. There are 54 card bodies. The structural surface of the plastic film sheet 1 is provided with micro-nano structures 2 formed by hot embossing or UV transfer or nanoimprinting. The micro-nano structures 2 are diffractive optical elements (DOEs) or holographic diffractive optical elements (HDOEs). Distinguishing information is carried on the micro-nano structures 2.

[0068] In this embodiment, the distinguishing features on each card are the patterns of playing cards, including four suits of hearts, spades, diamonds and clubs, the patterns from 1 to 13 for each suit, and the big and small jokers.

[0069] For various suits, from 1 to 13, the patterns become more and more complex. If the conventional micro-nano structure design method is used and the same micro-nano structure is used for production, the patterns formed by the micro-nano structures on the plastic film sheet 1 on each card will form a matte surface. Under ordinary light, the color difference can be seen with the naked eye, and the size of the card can be inferred based on the color difference, so the anti-peeping property is relatively poor, making the game lose fairness.

[0070] In order to improve the anti-peeping property of the cards, that is, no matter whether the patterns on the cards are simple or complex, there is no color difference and no difference can be seen with the naked eye. The present invention creatively proposes to make the following adjustments to the micro-nano structures on the structural surfaces of various cards:

[0071] Adjust the etching depth of the micro-nano structures. The etching depth of the micro-nano structures on the cards with simpler patterns is deeper, and the etching depth of the micro-nano structures on the more complex cards is shallower.

[0072] For example, for the cards with suit patterns from 1 to 5, the etching depth of the micro-nano structures on them is between 1.20 microns and 1.5 microns. For the cards with suit patterns from 6 to 10, the etching depth of the micro-nano structures on them is between 0.8 microns and 1.0 microns. For the cards with suit patterns from 11 to 13, that is, the patterns of King K, Queen Q, Jack J and the big and small jokers, the etching depth of the micro-nano structures on them is between 0.1 micron and 0.6 microns.

[0073] In another adjustment scheme, adjust the order of the DOE on the cards, that is, use different numbers of photolithography processes for different cards in the process to form micro-nano structures with different orders on the cards. For the cards with suit patterns from 1 to 5, the DOE on them is an eight-order DOE obtained through three photolithography processes. For the cards with suit patterns from 6 to 10, the DOE on them is a four-order DOE obtained through two photolithography processes. For the cards with patterns from 11 to 13 and the big and small jokers, a second-order micro-nano structure is obtained through one photolithography process.

[0074] The more the number of lithography times, the darker the matte color on the plastic film of the card. For cards with simple patterns, a higher order of lithography times is adopted, and for cards with more complex patterns, a lower order of lithography times is adopted. In this way, the matte colors of cards with different degrees of complexity in a poker card pattern can be adjusted to be very close and indistinguishable to the naked eye. In a specific adjustment scheme, the set wavelength is 520 nm. For cards with simple patterns, the etching depth of the first lithography is 577.2 nanometers, the second is 288.6 nanometers, and the third is 144.3 nanometers.

[0075] For cards with more complex patterns, two lithographies are adopted to obtain a fourth-order DOE. In these two lithographies, the etching depth of the first lithography is 577.2 nanometers, and the second is 288.6 nanometers.

[0076] For cards with even more complex patterns, one lithography is adopted to obtain a second-order DOE, and the etching depth in this one lithography is 577.2 nanometers.

[0077] The foregoing is only an embodiment for explaining and illustrating the means of adjusting the order of micro-nano structures, and should not be construed as a limitation on this means.

[0078] Regarding the order of micro-nano structures of each card, it can also be that the order of each card in a complete set of cards is the same, which can be the second order, or the fourth order or the eighth order. The more the order, the higher the diffraction efficiency of the pattern displayed under the irradiation light. However, increasing the order will increase the production cost. In another adjustment scheme, the adjustment of the etching depth and order of the micro-nano structures on the above-mentioned cards can be combined. Such adjustment can make the anti-peeping characteristics of the cards made of transparent plastic film more ideal.

[0079] In another adjustment scheme, a colored transparent plastic film is used as the card body. By using a colored plastic film, such as a plastic film like sunglasses, the light transmittance is reduced, and the visual color difference of the micro-nano structures on each card can also be made to tend to be the same, achieving a perfect anti-peeping effect.

[0080] In yet another adjustment scheme, a coating layer is provided on the structural surface of the card, which can change the light transmittance of the card, making the color difference of the micro-nano structures on cards with simple patterns and cards with complex patterns basically the same and difficult to distinguish, so as to enhance the anti-peeping performance. In this adjustment scheme, any light-transmitting material can be used as the coating material. Here, aluminum can be used as an example. The coating can adopt processes such as evaporation, ion, and sputtering. Regardless of which process is used and what the coating thickness is, it is based on the light transmittance of the obtained plastic film being 20~90%, so that cards with different distinguishing features have no difference visually, achieving anti-peeping by adjusting the light transmittance of the plastic film.

[0081] In actual use, one or several or all of the measures of adjusting the etching depth, the number of etching times, using a colored plastic film, and setting an optical coating for the card can be adopted. Through the reasonable combination of several measures, an ideal anti-peeping effect can be achieved.

[0082] Using a colored transparent plastic film as the card body and setting a coating layer on the card can make the light of the point light source of the irradiated light softer, making the imaging effect more comfortable and soft.

[0083] For a card made of a plastic film of colorless transparent material, a good anti-peeping effect can be achieved by adjusting the etching depth and the number of photolithography times of the micro-nano structure on it. For making game cards using a colorless transparent plastic film, these means are needed to solve the problem of visual color difference.

[0084] If the card can be made of a colored transparent plastic film, the problem of visual color difference can also be better solved, achieving a better anti-peeping effect and having better economy.

[0085] For a card of a colored transparent plastic film, the cooperation of the coating layer can also be combined.

[0086] For a card made of a colorless transparent plastic film, the problem of visual color difference can also be more ideally solved as long as the means of using the coating layer are adopted. At this time, the etching depth and the order of the micro-nano structure on each card in a set of game cards can be the same, and this method has better economy.

[0087] It has been proved by experiments that using a colored transparent plastic film and setting a coating layer on the plastic film to reduce the light transmittance will not affect the imaging effect.

[0088] The micro-nano structure on the aforementioned structural surface is a 3D micro / nano structure.

[0089] In the playing cards provided in the above embodiment, when viewed with the naked eye under ordinary light, neither the holder nor the opponent of the card can or is not easily able to see the difference in color difference on the card surface, and cannot guess the size of the cards, achieving 360-degree all-round anti-peeping. The holder needs to look through the plastic film 1 at the point light source 6 to read the difference information on the micro-nano structure 2 (such as Figure 2 shown). For example, when using such a deck of playing cards, an LED lamp 6 can be placed in the middle, and the users sit around the LED lamp and each reads the difference information on the card surface through the LED lamp. The card in hand can also be placed on the table, and the LED lamp 5 or the flashlight of the mobile phone shines on the card surface of the card 1 (such as Figure 3 shown) and the difference information on the card surface can also be seen.

[0090] The unit size of the micro / nano structures on the structural surface can be repeatedly arranged within 2 mm × 2 mm; for example, the unit can be 1×1 mm, and is repeatedly arranged within a set area on the structural surface. In this way, as long as the point light source irradiates any position in this area, the pattern on the card can be presented.

[0091] Embodiment 2:

[0092] Refer to Figure 4 and Figure 5 As shown, the difference from the previous embodiment is that a first printed pattern 3' is provided on the non-structural surface of the plastic film 1' in this embodiment.

[0093] Embodiment 3:

[0094] Refer to Figure 6 As shown, the difference from Embodiment 2 is that a second printed pattern 4' is provided on a part of the structural surface of the plastic film 1'' in this embodiment. The pattern information of the second printed pattern 4' can be the same as the difference information. In this way, in addition to reading the difference information through the light source, this card can also be used like an ordinary card.

[0095] Embodiment 4:

[0096] In this embodiment, there are 12 cards in a set. A colored plastic film is used as the card body. The patterns formed by the DOE elements with nano-structures provided on the structural surfaces of each card are respectively the twelve beauties in "Dream of the Red Chamber". The etching depth and order of the nano-structures of the DOE elements on each card are the same. In this embodiment, another scheme of the micro-nano structure card provided by the present invention is given, that is, the difference features on the micro-nano structures of each card in a set of cards are still related to each other and can also be coherent, but they are not playing cards. Developing such a set of cards can more widely expand the application range of the cards provided by the present invention.

[0097] The set of cards of the twelve beauties in "Dream of the Red Chamber" provided in this embodiment can be sold as a set or separately.

[0098] The present invention first proposes to use DOE or HDOE to design patterns on a transparent plastic film to make a set of cards. The difference information recorded on the micro-nano structures on them, and the difference features between each card are coherent and / or have a logical relationship, and can be made into playing cards, etc., adding new forms of expression and new varieties to such playing cards. Further, in order to meet the anti-peeping requirements of playing cards, the present invention creatively adjusts the micro-nano structures on each card, such as etching depth, order of the micro-nano structures, etc., and can also use a colored plastic film and set a coating layer on the plastic film by adjusting the light transmittance of the plastic film. Through the above various measures, the cards can be anti-peeping in all directions of 360°.

[0099] For example, for playing cards, the complexity of the patterns on each card varies greatly. Anti-peeping can be achieved by adjusting the number of photolithography times for each card, that is, the order of the micro-nano structure. For a set of cards with relatively similar pattern complexities, anti-peeping can be achieved by adjusting the etching depth of the micro-nano structure on each card. Using a colored transparent film or setting a coating layer on the card can effectively adjust the visual color difference on the card surface and also improve its aesthetics.

[0100] The above embodiments are only used to further illustrate a micro-nano structure card and its usage method of the present invention. However, the present invention is not limited to the embodiments. Any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A micro-nano structure card, characterized in that: It includes a card body made of several transparent or semi-transparent plastic film sheets. One surface of the plastic film sheet is a structured surface, and its back is an unstructured surface. A grating micro-nano structure formed by hot pressing or UV transfer is provided on the structured surface, and difference information is carried on the grating micro-nano structure, and the content of the difference information on each card is different; the grating micro-nano structure is a diffractive optical element, i.e., DOE, or a holographic diffractive optical element, i.e., HDOE, and the micro-nano structure on the structured surface is a 3D micro-nano structure.

2. A micro-nano structure card, characterized in that: It includes a card body made of several transparent or semi-transparent plastic film sheets. One surface of the plastic film sheet is a structured surface, and its back is an unstructured surface; a micro-nano structure is provided on the structured surface, and difference information is carried on the micro-nano structure. The micro-nano structure cards include several cards, and the difference features carried on the micro-nano structures on the structured surfaces of each card are different, but the patterns formed by the difference features on each card are logically related in content, so that all the cards form a set of cards. The micro-nano structure is a diffractive optical element, i.e., DOE, or a holographic diffractive optical element, i.e., HDOE, and the micro-nano structure on the structured surface is a 3D micro-nano structure.

3. A micro-nano structure card according to claim 1 or 2, characterized in that: When viewed with the naked eye under ordinary light, there is no difference among the cards in a set of cards, so that the difference features and the expressed difference information on them cannot be distinguished; and / or, when viewed with the naked eye under ordinary light, each card has 360-degree full-angle anti-peeping, that is, the frosted surfaces shown on all the cards in a set of cards are visually the same at any angle; In a set of cards, the anti-peeping adjustment means is at least one of the following measures: Measure 1: The etching depths of the micro-nano structures on the structured surfaces of each card body are not the same; Measure 2: The orders of the micro-nano structures on each card in a set of cards are the same; or, the orders of the micro-nano structures on each card are not the same; Measure 3: The plastic film sheet is made of a colored transparent material; Measure 4: A coating layer is provided on the surface of the plastic film sheet to adjust the visual color difference of each card; and / or, The structured surface is a micron structure or a nano structure; and / or, The unit size of the micro-nano structure on the structured surface is repeatedly arranged within 2 mm × 2 mm.

4. The micro-nano structure card according to claim 3, characterized in that: The unit size of the micro-nano structure on the structured surface is repeatedly arranged within 0.5~2 mm × 0.5~2 mm.

5. The micro-nano structure card according to claim 2, characterized in that: A micro-nano structure formed by hot pressing or UV transfer or nanoimprinting is provided on the structured surface.

6. A micro-nano structure card according to claim 3, characterized in that: In Measure 1, the etching depth of the micro-nano structure is not the same according to the complexity of the pattern of each card. The etching depth of the micro-nano structure on the card with a simpler pattern is deeper, and the etching depth of the micro-nano structure on the card with a more complex pattern is shallower; and / or, In Measure 2, the order of the micro-nano structure is not the same according to the complexity of the pattern of each card; the order of the micro-nano structure on the card with a simpler pattern is more, and the order of the micro-nano structure on the card with a more complex pattern is less.

7. A micro-nano structure card according to claim 6, wherein: In the means 1, the etching depth on each card is between 0.1 um and 3 um; and / or, In the means 2, the micro-nano structure on the structural surface of each card is formed by lithography between 1 and 5 times to form a second-order, fourth-order, eighth-order, sixteenth-order or thirty-second-order micro-nano structure to change the matte color effect of the micro-nano structure; and / or, In the means 4, the coating layer is a colored transparent coating; and / or, In the means 4, the coating is provided, and the light transmittance parameter of the coating film layer is 20-90% to adjust the visual color difference of each card; and / or, In the means 4, the coating material of the coating layer is aluminum, or silver, or gold, or platinum, or nickel; and / or, In the means 4, the coating layer is provided on the structural surface.

8. A micro-nano structure card according to claim 1 or 2, characterized in that: The non-structural surface of the plastic film is provided with a first printed pattern, or a part of the non-structural surface of the plastic film is provided with a first printed pattern; and / or, A part of the structural surface of the plastic film is provided with a second printed pattern.

9. The micro-nano structure card according to claim 8, characterized in that: The content of the second printed pattern is consistent with the content of the difference information.

10. A method for using a micro-nano structure card, characterized in that: It includes a micro-nano structure card according to any one of claims 1 to 8; The difference information is read by looking at the light source through the plastic film; or, the difference information is presented when the light source irradiates on the plastic film.

Images