CN101434176A - Optical anti-counterfeiting element and product with the same - Google Patents
Optical anti-counterfeiting element and product with the same Download PDFInfo
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- CN101434176A CN101434176A CN200810186575.1A CN200810186575A CN101434176A CN 101434176 A CN101434176 A CN 101434176A CN 200810186575 A CN200810186575 A CN 200810186575A CN 101434176 A CN101434176 A CN 101434176A
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Abstract
The invention provides an optical anti-counterfeiting element, which comprises a base layer, a plane diffraction type lenticule array which is positioned on a first surface of the base layer and at least partially covers the first surface of the base layer, as well as a micro-pattern array which is positioned on a second surface of the base layer and is corresponding to the plane diffraction lens array. The element reproduces a magnified image of the micro-pattern array through the imaging function of the plane diffraction type lenticule array, and has a certain depth of field and dynamic effect. The element is especially applicable to window-safety lines in banknotes, and can also be used for preventing counterfeits of banknotes, credit cards, passports, negotiable securities and various types of high-safety products and high value-added products.
Description
Technical field
The present invention relates to be applicable to a kind of optical anti-counterfeiting element of all kinds of high safety products such as banknote, credit card, passport, marketable securities and high value added product, and relate to the product that has this Security element, specifically, relate to a kind of optical anti-counterfeiting element that has planar diffraction type microlens array and miniature pattern array.The invention further relates to the product that has this optical anti-counterfeiting element, for example use banknote or the cheque paper of this optical anti-counterfeiting element as opened window safety line.
Background technology
In order to prevent to forge, extensively adopted the optical anti-counterfeiting technology in contour safety product of banknote, credit card, passport and marketable securities and the high value added product, and obtained extraordinary effect.
United States Patent (USP) 5712731, Chinese patent application 03123580.8, Chinese patent application 200480040733.2 (United States Patent (USP) 7333268 that it was authorized corresponding on February 19th, 2008), U.S. Patent application 20070273143, U.S. Patent application 20080036196 disclose same class has sphere or aspherical microlens array and micrographics array respectively on two surfaces safety element, by an imaging effect generation dynamic figure amplification, that have certain depth of field of microlens array.This sphere or aspherical microlens are the lenticules of refractive, and promptly each lenticule in the array all is the surface configuration with raised or sunken continuous curve surface, and utilize refraction principle imaging in the geometric optics.
Chinese patent application 200510086954.X discloses a kind of micro Character array anticounterfeit mark and preparation method thereof.
Chinese patent application 200510086953.5 discloses a kind of flat magnifier for microfilm of characters, i.e. the fresnel lens array that is complementary with cycle of micro Character array anticounterfeit.
Summary of the invention
The invention provides a kind of Security element different and the product that has this optical anti-counterfeiting element with the existing product structure.
According to an aspect of the present invention, provide a kind of optical anti-counterfeiting element, described optical anti-counterfeiting element comprises: basic unit, described basic unit have first surface and with described first surface opposing second surface; Be positioned on the described first surface and cover the planar diffraction type microlens array of described first surface to small part; And be positioned at micro pattern array on the described second surface.The enlarged image of miniature pattern array is reproduced in imaging effect by planar diffraction type microlens array, and has certain depth of field and dynamic effect.
The focal length of described planar diffraction type microlens array is 5 microns to 100 microns, be preferably 10 microns to 30 microns, cycle is generally 5 microns to 100 microns, be preferably 10 microns to 30 microns, the cycle of described little pattern array 4 is complementary with it, according to reproducing effect of requirement, can equal, be slightly larger than or be slightly less than the cycle of described micro fresnel lens array.
The groove depth of described planar diffraction type microlens array is preferably 0.1 micron to 1 micron less than 2 microns, can use mould pressing process mold pressing on the first surface of described basic unit of making holographic product and form.
Described planar diffraction lens arra both can be a transmission imaging, also can be catoptric imaging.Do the time spent at the catoptric imaging that utilizes the planar diffraction lens, need to increase metal or dieletric reflection layer usually and reproduce effect to improve.
In a specific embodiments, what described planar diffraction type microlens array adopted is standard Fresnel diffraction micr-lens array.
What in a preferred embodiment, described planar diffraction type microlens array adopted is notch cuttype Fresnel diffraction micr-lens array.
In another preferred embodiment, what described planar diffraction type microlens array adopted is Nitride Binary-Phase Fresnel zone plate array.
In a preferred embodiment again, what described planar diffraction type microlens array adopted is amplitude type Fresnel zone plate array.
In another preferred embodiment, what described planar diffraction type microlens array adopted is sub-wavelength binary microlens array array.
In other preferred embodiment, described optical anti-counterfeiting element can further have the diffraction light change pattern, interference light becomes pattern, printed patterns, partially metallised pattern, phosphor pattern etc., and is used at least a of machine-readable magnetic medium layer.
The present invention is particularly suitable for being made into opened window safety line.The thickness of described safety line is not more than 40 microns.The cheque paper that has described opened window safety line is used for the false proof of all kinds of high safety products such as banknote, passport, marketable securities.
The present invention also can be used as label, sign, wide, transparent window etc., can stick on the various article by various bonding mechanisms.For example transfer on banknote, the contour safety product of credit card and the high value added product.
The present invention provides the product that has described optical anti-counterfeiting element on the other hand, and described product includes but not limited to all kinds of high safety products and high value added products such as banknote, credit card, passport, marketable securities, and each wrapping paper, packing box etc.
Description of drawings
Fig. 1 a is the first preferred version schematic diagram of the present invention;
Fig. 1 b, Fig. 1 c show a kind of arrangement mode of micro fresnel lens array and miniature pattern array;
Fig. 1 d, Fig. 1 e show the another kind of arrangement mode of micro fresnel lens array and miniature pattern array;
Fig. 2 is the second preferred version schematic diagram of the present invention;
Fig. 3 is the 3rd a preferred version schematic diagram of the present invention;
Fig. 4 a is the 4th a preferred version schematic diagram of the present invention;
Fig. 4 b shows a kind of amplitude type Fresnel zone plate array;
Fig. 5 is the 5th a preferred version schematic diagram of the present invention.
The specific embodiment
In order to understand the present invention better, will make more detailed description with reference to the accompanying drawings to various aspects of the present invention.Be appreciated that described drawings and detailed description are the description to the preferred embodiment of the invention, but not limit the scope of the invention by any way.
What Fig. 1 a showed is the schematic cross-section of the present invention's first preferred embodiment.Optical anti-counterfeiting element 1 comprises basic unit 2, be positioned on the first surface of basic unit 2 and cover the Fresnel diffraction micr-lens array 3 of first surface of basic unit 2 and second surface and the micro fresnel lens array 3 corresponding miniature pattern array 4 that are positioned at basic unit 2 to small part.Fig. 1 b and Fig. 1 c are a kind of arrangement modes of Fresnel diffraction micr-lens array 3 and corresponding with it miniature pattern array 4, and Fig. 1 d and Fig. 1 e are another kind of arrangement modes.The arrangement mode of Fresnel diffraction micr-lens array 3 and corresponding with it miniature pattern array 4 can be set arbitrarily according to the requirement of product.
The focal length of Fresnel diffraction micr-lens array 3 is 5 microns to 100 microns, and be preferably 10 microns to 30 microns, cycle is generally 5 microns to 100 microns and be preferably 10 microns to 40 microns, the cycle of miniature pattern array 4 and Fresnel diffraction micr-lens array 3 are complementary, according to reproducing effect of requirement, the cycle of miniature pattern array 4 can equal, is slightly larger than or is slightly less than the cycle of Fresnel diffraction micr-lens array 3.When seeing through 3 observations of Fresnel diffraction micr-lens array, can see dynamic image amplification, that certain depth of field is arranged.Relation between the parameter of reproduction effect and Fresnel diffraction micr-lens array 3 and miniature pattern array 4 can be consulted the detailed argumentation in the Chinese patent application 200480040733.2.
The groove depth of Fresnel diffraction micr-lens array 3 is preferably 0.1 micron to 1 micron less than 2 microns, and this groove can be used mould pressing process mold pressing on the first surface of basic unit 2 of making holographic product and form.
A kind of method of making Security element 1 is in the first and second surface whiles of basic unit 2 or forms micro fresnel lens array 3 and miniature pattern array 4 in turn.Should be appreciated that basic unit 2 itself can be the single transparent dielectric film of one deck, also can be multilayer film when adopting this method to make Security element 1.
The another kind of method of making Security element 1 is to make Fresnel diffraction micr-lens array 3 and miniature pattern array 4 on different films respectively, through combination process as known in the art the two is combined with each other again.The two membranes compound tense, the film that has the film of Fresnel diffraction micr-lens array 3 and have a miniature pattern array 4 can be back-to-back compound, and promptly the distance between Fresnel diffraction micr-lens array 3 and the miniature pattern array 4 is the thickness that the thickness of two membranes adds compound adhesive; Also can be to have the film of Fresnel diffraction micr-lens array 3 and have the pellicular front of miniature pattern array 4 compound to same direction, promptly the distance between Fresnel diffraction micr-lens array 3 and the miniature pattern array 4 adds the thickness of compound adhesive for the thickness of a skim wherein.
What Fig. 2 showed is second preferred embodiment of the present invention, has wherein replaced standard Fresnel diffraction micr-lens 3 in first preferred version with notch cuttype Fresnel diffraction micr-lens 5.The Fresnel diffraction micr-lens 5 that modern mask-making technology is made notch cuttype is more prone to than production standard Fresnel diffraction micr-lens 3, and the production reproduction process is identical, i.e. mold pressing production technology.Exponent number is high more, and notch cuttype Fresnel diffraction micr-lens 5 is approaching more with the performance of standard Fresnel diffraction micr-lens 3, can require to determine exponent number according to reality.
What Fig. 3 showed is the 3rd preferred embodiment of the present invention, has wherein replaced standard micro fresnel lens 3 in first preferred version with Nitride Binary-Phase Fresnel zone plate 6.Nitride Binary-Phase Fresnel zone plate 6 is fresnel diffraction lens 5 of simple second-order notch cuttype.Under many occasions, the image quality of the fresnel diffraction lens of second order notch cuttype also meets the demands.
What Fig. 4 a showed is the 4th preferred embodiment of the present invention, wherein utilizes amplitude type Fresnel zone plate array 7 as image-forming component.Fig. 4 b is the schematic diagram of amplitude type Fresnel zone plate array 7, and certainly, the spread pattern of Fresnel zone plate array 7 can be cellular (Fig. 1 d) or other any forms.Fresnel zone plate array 7 can form by printing, ink-jet, mode such as partially metallised.
What Fig. 5 showed is the 5th preferred embodiment of the present invention, and it utilizes sub-wavelength binary microlens array 8 as image-forming component.Sub-wavelength binary lenticule 8 also is a kind of planar diffraction lenticule, has the feature flute profile width of sub-wavelength yardstick.
Above-mentioned embodiment, all be amplification, the dynamic image that utilizes the transmission imaging effect reproduction micrographics array of planar diffraction lens arra, when promptly observing, the plane at miniature pattern array place is in the position away from human eye, and the plane at planar diffraction lens arra place is in the middle of human eye and miniature pattern array.In fact, the planar diffraction lens arra also has the catoptric imaging effect simultaneously, utilize the catoptric imaging effect of planar diffraction lens can reproduce amplification, the dynamic image of miniature pattern array equally, when promptly observing, the plane at planar diffraction lens arra place is in the position away from human eye, and the plane at miniature pattern array place is in the middle of human eye and plane diffraction lens array.Do the time spent at the catoptric imaging that utilizes the planar diffraction lens, need to increase metal or dieletric reflection layer usually and reproduce effect to improve.
In the above-described embodiment; in order to protect the grooved of planar diffraction lens arra; increase the service life of Security element 1, one or more layers transparent dielectric film that can be complementary at planar diffraction lens arra surface evaporation or coating refractive index and planar diffraction lens arra.
In above all embodiments, first and/or second surface of the basic unit of described Security element further can have the diffraction light change pattern, interference light becomes pattern, printed patterns, partially metallised pattern, phosphor pattern etc.
In above all embodiments, described Security element can further comprise and be used for machine-readable magnetic medium.
The present invention is particularly suitable for being made into opened window safety line.The thickness of safety line is not more than 40 microns, safety line fragment ground is embedded in the paper, and the exposure of fragment ground on paper, thereby forms the cheque paper that has opened window safety line, is used for the false proof of all kinds of high safety products such as banknote, passport, marketable securities.
The present invention also can be used as label, sign, wide, transparent window etc., can stick on the various article by various bonding mechanisms, for example transfers on banknote, the contour safety product of credit card and the high value added product.
The product that has optical anti-counterfeiting element of the present invention includes but not limited to all kinds of high safety products and high value added products such as banknote, credit card, passport, marketable securities, and each wrapping paper, packing box etc.
Some preferred embodiment of the present invention has below exemplarily been described.And will be understood by those skilled in the art that under the prerequisite that does not depart from design of the present invention and spirit and can make various equivalents or modification to it.And the technical scheme that so obtains also should belong to scope of the present invention.
Claims (23)
1. optical anti-counterfeiting element comprises:
Basic unit, described basic unit have first surface and with described first surface opposing second surface;
Be positioned on the described first surface and cover the planar diffraction type microlens array of described first surface to small part; And
Be positioned at the micro pattern array on the described second surface.
2. optical anti-counterfeiting element according to claim 1, wherein said planar diffraction type microlens array is a transmission plane diffraction type microlens array.
3. optical anti-counterfeiting element according to claim 1, wherein said planar diffraction type microlens array is a plane of reflection diffraction type microlens array.
4. optical anti-counterfeiting element according to claim 3, wherein said plane of reflection diffraction type microlens array has metal or dieletric reflection layer.
5. according to each described optical anti-counterfeiting element among the claim 1-4, wherein said planar diffraction type microlens array is the Fresnel diffraction micr-lens array.
6. optical anti-counterfeiting element according to claim 5, wherein said planar diffraction type microlens array is a notch cuttype Fresnel diffraction micr-lens array.
7. according to each described optical anti-counterfeiting element among the claim 1-4, wherein said planar diffraction type microlens array is a Nitride Binary-Phase Fresnel zone plate array.
8. according to each described optical anti-counterfeiting element among the claim 1-4, wherein said planar diffraction type microlens array is an amplitude type Fresnel zone plate array.
9. according to each described optical anti-counterfeiting element among the claim 1-4, wherein said planar diffraction type microlens array is a sub-wavelength binary microlens array.
10. according to each described optical anti-counterfeiting element among the claim 5-9, the focal length of wherein said planar diffraction type microlens array is 5 microns to 100 microns.
11. optical anti-counterfeiting element according to claim 10, the focal length of wherein said planar diffraction type microlens array are 10 microns to 30 microns.
12. optical anti-counterfeiting element according to claim 1, wherein said micro pattern array forms by contour forging, printing, impression, laser ablation or partially metallised mode.
13. optical anti-counterfeiting element according to claim 1, wherein said basic unit is the single transparent dielectric film of one deck.
14. optical anti-counterfeiting element according to claim 13, wherein said single transparent dielectric film are PET film or PVC film.
15. optical anti-counterfeiting element according to claim 1, wherein said basic unit is the multilayer film through being composited.
16. according to each described optical anti-counterfeiting element among the claim 13-15, wherein said basic unit is the transparent dielectric film that has functional coating on the surface.
17. optical anti-counterfeiting element according to claim 16, wherein said functional coating are embossed layer.
18. optical anti-counterfeiting element according to claim 1, evaporation or be coated with one or more layers transparent medium diaphragm that refractive index is complementary on the wherein said planar diffraction type microlens array.
19. optical anti-counterfeiting element according to claim 1 further has diffraction light change pattern, interference light and becomes pattern, printed patterns, partially metallised pattern, phosphor pattern and be used for machine-readable magnetic medium layer one of at least.
20. a safety line is characterized in that comprising according to each described optical anti-counterfeiting element among the claim 1-19.
21. safety line according to claim 20, the thickness of wherein said safety line are not more than 40 microns.
22. a cheque paper is characterized in that described cheque paper has safety line according to claim 20, described safety line embeds in the paper with the form of opened window safety line.
23. cheque paper according to claim 22, the thickness of wherein said safety line are not more than 40 microns.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810186575.1A CN101434176B (en) | 2008-12-25 | 2008-12-25 | Optical anti-counterfeiting element and product with the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810186575.1A CN101434176B (en) | 2008-12-25 | 2008-12-25 | Optical anti-counterfeiting element and product with the same |
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| CN101434176A true CN101434176A (en) | 2009-05-20 |
| CN101434176B CN101434176B (en) | 2012-11-07 |
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