CN212460096U - Dynamic coding anti-counterfeiting structure based on micro-optics - Google Patents
Dynamic coding anti-counterfeiting structure based on micro-optics Download PDFInfo
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- CN212460096U CN212460096U CN202021232216.8U CN202021232216U CN212460096U CN 212460096 U CN212460096 U CN 212460096U CN 202021232216 U CN202021232216 U CN 202021232216U CN 212460096 U CN212460096 U CN 212460096U
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Abstract
The utility model discloses a dynamic coding anti-counterfeiting structure based on micro-optics, which at least comprises a displayed image and a display micro-element, wherein the display micro-element is arranged above the displayed image; the display micro-element is of a micro-lens array structure, and each image in the displayed image and each micro-lens in the micro-lens array are respectively and correspondingly arranged; the focal length of each adjacent microlens in the display microelement has a tendency to become larger or smaller. The utility model discloses the structure is through carrying out slowly and progressive change to microlens numerical aperture, on display effect, can obtain different magnification's display effect in different regions, not only can effectively improve monotonic display mode in the prior art, also greatly increased anti-fake technology threshold simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the dynamic display based on little optical structure, especially, relate to a dynamic coding anti-fake structure based on little optics.
Background
In recent years, anti-counterfeiting and display technologies are rapidly developed, mainly laser holograms are used as main materials, but the technology is semi-disclosed, and anti-counterfeiting functions are challenged. In addition, techniques such as watermark anti-counterfeiting and the like have been developed for a long time, and the basic principles and implementation methods are also basically known to the public. The development of new anti-counterfeiting technology is urgently needed.
Therefore, an amplification display anti-counterfeiting method based on an optical principle is proposed, and the principle of the method is as follows: under the normal illumination condition, the limit resolution of human eyes is 1 minute, and under the condition of the photopic distance of 250mm, the limit resolution of human eyes is 0.072 mm. Generally, in order to prevent eye fatigue, the visual angle of human eyes is about 4 minutes, that is, two points with a distance of about 0.3mm can be distinguished. In general, 10 × 10 dots constitute a simple pattern with a size of about 4mm × 4mm, and other fine objects must be magnified with a magnifying glass or microscope to see the fine structure. For patterns smaller than this dimension, an auxiliary tool such as a microscope must be used, and this observation is very inconvenient.
In the patent with application number 03123580.8, the inventor proposes a display anti-counterfeiting method for magnifying and imaging a micro image by using a micro lens, which effectively avoids the above problems; however, the above patent has a problem that the displayed image must be in a periodic pattern and the picture cell must be matched with the aperture of the microlens cell.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: in order to overcome the problems of the prior art, the dynamic coding anti-counterfeiting structure based on the micro-optics is provided, and the anti-counterfeiting structure effectively overcomes the defects that the displayed image in the prior art is required to be a periodic graph, and different areas on a display film can only obtain completely consistent amplification and display effects, so that the display effect is simple and the anti-counterfeiting threshold is low.
The purpose of the utility model is realized through the following technical scheme:
a micro-optics based dynamically coded security structure comprising at least a displayed image and a display micro-element, the display micro-element being positioned over the displayed image; the display micro-element is of a micro-lens array structure, and each image in the displayed image and each micro-lens in the micro-lens array are respectively and correspondingly arranged; the focal length of each adjacent microlens in the display microelement has a tendency to become larger or smaller.
According to a preferred embodiment, the display micro-element is a continuous-surface-shaped micro-lens array structure or a multi-step structure diffraction micro-lens array structure.
According to a preferred embodiment, the aperture change rate of adjacent microlenses is 10% to 0.1%.
According to a preferred embodiment, the aperture change rate of adjacent microlenses is 0.2%.
According to a preferred embodiment, the arrangement of each image in the displayed image and each microlens in the display microelements includes, but is not limited to, a quadrilateral arrangement, a hexagonal arrangement and a circular arrangement.
According to a preferred embodiment, the manner of preparation of each of the displayed images includes, but is not limited to, printing or print preparation.
According to a preferred embodiment, each of the displayed images is prepared in a manner further including a pattern formed using a photonic crystal or grating diffraction type micro-nano structure.
According to a preferred embodiment, the spacing h between the displayed microimages and the display microelements is related to the display microelement focal length F as follows: h is more than or equal to F/2 and less than or equal to 2F.
According to a preferred embodiment, the displayed image is disposed on a PET substrate.
The main scheme and the further selection schemes of the utility model can be freely combined to form a plurality of schemes, which are the schemes that can be adopted and claimed by the utility model; and the utility model discloses also can the independent assortment between (each non-conflict selection) selection and between other choices. The technical solutions to be protected by the present invention, which are various combinations that can be known to those skilled in the art based on the prior art and the common general knowledge after understanding the present invention, are not exhaustive herein.
The principle of the utility model is that: the displayed image is sampled by using a display micro-element (i.e. a micro-lens), and when the aperture of the micro-lens is changed, the magnification of the micro-lens to the displayed image unit is also changed step by step. By regulating and controlling the aperture of the micro lens, different amplification and display effects can be obtained in different areas in a display plane.
The utility model has the advantages that:
1. the combination mode of the display micro-element and the displayed image array is various, and various display effects can be generated;
2. the expected display effects with different magnifications can be obtained by regulating and controlling the structural parameters and the combination mode of the display micro-elements and the displayed image;
3. the method is very easy to realize, low in cost and easy to industrialize;
4. beautiful, practical and convenient to carry, can be made into a slice structure and has good market prospect.
Drawings
FIG. 1 is a schematic view of the anti-counterfeit structure of the present invention;
FIG. 2 is a moving mask pattern for making display micro-elements or micro-lenses;
FIG. 3 is a schematic diagram of the structure of the present invention showing an enlarged image;
the array comprises a 1-microlens array, a 2-microimage array and a 3-PET substrate.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that, in order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Additionally, the utility model discloses it is pointed out that, in the utility model, if do not write out structure, connection relation, positional relationship, power source relation etc. that concretely relates to very much, then the utility model relates to a structure, connection relation, positional relationship, power source relation etc. are technical personnel in the field on prior art's basis, can not learn through creative work.
Example 1
Referring to fig. 1, a micro-optics based dynamically coded security feature is shown. The security structure includes a displayed image, a display microelement, and a substrate. Preferably, the displayed image is a micro image array 2 formed by a number of micro images. The display micro-element is a micro-lens array 1 formed by a number of micro-lenses. The substrate is a PET substrate 3.
Preferably, the display micro-element is placed over the displayed image. The display micro-element is in a micro-lens array structure. The displayed image is disposed on a PET substrate.
Preferably, each image in the displayed image is arranged in one-to-one correspondence with each microlens in the microlens array.
Preferably, the display micro-element is a continuous surface-shaped micro-lens array structure or a multi-step structure diffraction type micro-lens array structure.
Preferably, the focal length of each adjacent microlens in the display microelement has a tendency to become larger or smaller. Further, the aperture change rate of the adjacent microlenses is a value between 10% and 0.1%. The typical rate of change of aperture of adjacent microlenses is 0.2%. That is, the numerical aperture of the latter microlens is 0.2% larger or 0.2% smaller than that of the former microlens, and so on.
Preferably, the arrangement of each image in the displayed image and each microlens in the display microelements includes, but is not limited to, a quadrilateral arrangement, a hexagonal arrangement and a circular arrangement.
Preferably, the manner of preparation of each image in the displayed image includes, but is not limited to, printing or print preparation. For example, the preparation method of each image in the displayed image further includes a pattern formed by a photonic crystal or a grating diffraction type micro-nano structure.
Preferably, the spacing h between the displayed microimages and the display microelements has the following relationship to the display microelement focal length F: h is more than or equal to F/2 and less than or equal to 2F.
The application example is as follows: dynamic display of "smiling face" patterns zooms in.
Firstly, the traditional plate making and photoetching technology is adopted to make arrayed pictures and texts with a smiling face cycle of 50 microns as displayed patterns.
Next, a microlens array having a period of 50 μm but a stepwise change in numerical aperture was fabricated. In this step, we choose to modulate the microlens rise, and then realize the modulation of the microlens numerical aperture and magnification. In the experiment, a microlens was prepared using a mask moving method, and fig. 2 is a designed microlens-forming mask pattern. Because the light-transmitting area of the micro-lens mask is gradually reduced from left to right, the mask is adopted to carry out horizontal movement exposure, and after development, the required micro-lens array can be obtained.
On the basis, the micro-lens pattern is loaded on the smiling face of the displayed pattern, and the thickness between the micro-lens pattern and the smiling face is adjusted, so that the display effect shown in the figure 3 required by people can be obtained.
That is, the utility model discloses the structure is through carrying out slowly and the change that advances gradually to microlens numerical aperture, on display effect, can obtain different magnification's display effect in different regions, not only can effectively improve monotonic display mode in the original technique, simultaneously also greatly increased anti-fake technical threshold.
The aforesaid the utility model discloses basic embodiment and each further alternative can the independent assortment in order to form a plurality of embodiments, is the utility model discloses can adopt and claim the embodiment of protection. In the scheme of the utility model, each selection example can be combined with any other basic examples and selection examples at will.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A micro-optical based dynamically coded security feature, wherein said security feature comprises at least a displayed image and a display micro-element, said display micro-element being positioned over said displayed image;
the display micro-element is of a micro-lens array structure, and each image in the displayed image and each micro-lens in the micro-lens array are respectively and correspondingly arranged;
the focal length of each adjacent microlens in the display microelement has a tendency to become larger or smaller.
2. The dynamic coding anti-counterfeiting structure based on micro-optics as claimed in claim 1, wherein the display micro-elements are a continuous surface-shaped micro-lens array structure or a multi-step structure diffraction type micro-lens array structure.
3. A micro-optics based dynamically coded security feature as claimed in claim 1, wherein the aperture change rate of adjacent micro-lenses is between 10% and 0.1%.
4. A micro-optics based dynamically coded security feature as claimed in claim 3, wherein the aperture variation rate of adjacent micro-lenses is 0.2%.
5. The micro-optics based dynamically coded security feature of claim 1, wherein the arrangement of the micro-lenses in the displayed images and the display micro-elements includes but is not limited to a quadrilateral arrangement, a hexagonal arrangement and a circular arrangement.
6. The micro-optics based dynamically coded security feature of claim 1, wherein each image in the displayed image is produced by means including but not limited to printing or printing.
7. The dynamic coding anti-counterfeiting structure based on micro-optics according to claim 6, wherein the preparation mode of each image in the displayed image further comprises a pattern formed by a photonic crystal or grating diffraction type micro-nano structure.
8. A micro-optics based dynamically coded security feature as claimed in claim 1, wherein the distance h between the displayed image and the display micro-element is related to the focal length F of the display micro-element by: h is more than or equal to F/2 and less than or equal to 2F.
9. A micro-optic based dynamically coded security feature according to claim 1, wherein said displayed image is disposed on a PET substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021232216.8U CN212460096U (en) | 2020-06-29 | 2020-06-29 | Dynamic coding anti-counterfeiting structure based on micro-optics |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021232216.8U CN212460096U (en) | 2020-06-29 | 2020-06-29 | Dynamic coding anti-counterfeiting structure based on micro-optics |
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| CN212460096U true CN212460096U (en) | 2021-02-02 |
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| CN202021232216.8U Active CN212460096U (en) | 2020-06-29 | 2020-06-29 | Dynamic coding anti-counterfeiting structure based on micro-optics |
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