CN104249584A - Optical anti-counterfeiting element - Google Patents
Optical anti-counterfeiting element Download PDFInfo
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- CN104249584A CN104249584A CN201310269992.3A CN201310269992A CN104249584A CN 104249584 A CN104249584 A CN 104249584A CN 201310269992 A CN201310269992 A CN 201310269992A CN 104249584 A CN104249584 A CN 104249584A
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Abstract
The invention discloses an optical anti-counterfeiting element which comprises a base layer and optical elements positioned on at least one part of area of the base layer, wherein the optical elements are of diffraction microstructures which are periodically distributed in at least one direction; the range of the period is 0.3-6 micrometers; the diffraction microstructures are defined as follows: when a light beam irradiates the microstructures at an incident angle, light of a wavelength in the light beam or light within the wavelength range shows a first color in the direction of transmission light or reflection light.
Description
Technical field
The present invention relates to a kind of optical anti-counterfeit element.
Background technology
In order to prevent the forgery utilizing the means such as scanning and duplicating to produce, be widely used diffraction light change image (such as hologram, dynamic diffraction etc.) optical anti-counterfeit element in all kinds of high safety such as banknote, card and the packing of product or high added value printed matter, and achieve extraordinary effect.Such as, big euro notes have employed diffraction light change image hot-stamping mark, and low-denomination have employed the wide bar of diffraction light change image thermoprint, and Chinese Renminbi have employed diffraction light change image opened window safety line except unitary denomination.Unionpay's credit card of Visa, MasterCard and China have employed diffraction light change image hot-stamping mark, and the important certificate such as identity card, driver's license, passport of China also all have employed diffraction light change image anti-counterfeiting technology.Up to the present, the safe card such as most of banknotes, credit card, passport in the world have employed diffraction light change image anti-counterfeiting technology.
For the grating that false proof diffraction light change image is a kind of embossment structure, when illumination light (such as natural daylight) is irradiated to its surface, there is diffraction, its 1 grade of (or-1 grade) diffraction light is utilized to form reproduced image, by to the cycle of zones of different grating and the design in direction, realize the popular anti-counterfeiting characteristics such as eye-catching innervation, solid, color change.But, zero order light (reverberation and the transmitted light) direction of diffraction light change image only has the light faint marking, there is no obvious feature.
Day by day universal along with diffraction light change image technology, this technology have also been obtained and applies widely in general merchandise and packaging, and the such as packaging of cigarette, wine, medicine etc., even the label of textile, toy all have employed this technology.This anti-counterfeiting technology is more and more easy to realize, and the anti-counterfeiting performance of this technology is had a greatly reduced quality.Therefore, a kind of more reliable anti-counterfeiting technology is newly needed.
Summary of the invention
The object of this invention is to provide the more reliable optical anti-counterfeit element of one.
To achieve these goals, one aspect of the present invention provides a kind of optical anti-counterfeit element, and this element comprises: basic unit; And be positioned at the optical module at least part of region in described basic unit, this optical module has the diffraction micro structural of period profile at least one direction, the scope in cycle is 0.3 μm-6 μm, this diffraction micro structural is defined by when light beam irradiates described micro-structural with an incidence angle, and in this light beam, the light of a wavelength or wave-length coverage is interfered long mutually on transmitted light direction or reverberation direction.
Another aspect of the present invention provides a kind of optical anti-counterfeit element, and this element comprises: basic unit; Be positioned at the optical module at least part of region of described basic unit, this optical module have period profile at least one direction diffraction micro structural, the scope in cycle is 0.3 μm-6 μm; And the reflecting layer between described basic unit and described micro-structural, this micro-structural is defined by when light beam irradiates described micro-structural with an incidence angle, and in this light beam, the light of a wavelength or wave-length coverage presents the first color on reverberation direction.
An also aspect of the present invention provides a kind of optical anti-counterfeit element, and this element comprises: basic unit; To be positioned at least part of region of described basic unit period profile at least one direction diffraction micro relief profile, the scope in cycle is 0.3 μm-6 μm; And along the reflecting layer that described diffraction micro relief profile surface profile covers, the degree of depth of this micro-structural meets the following conditions: when light beam irradiates described reflecting layer with an incidence angle, in this light beam, the light of a wavelength or wave-length coverage is interfered long mutually on reverberation direction, and described optical anti-counterfeit element presents the first color on reverberation direction thus.
By technique scheme, can be implemented in rendering color images on the reverberation of described Security element or transmitted light direction, diffraction light direction is reproduced the effect of the common diffraction light change images such as innervation, solid, color change.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for description, is used from explanation the present invention, but is not construed as limiting the invention with detailed description of the invention one below.In the accompanying drawings:
Fig. 1 a-c shows the transmitted light Security element according to an embodiment of the invention;
Fig. 2 shows the transmitted light Security element according to an embodiment of the invention;
Fig. 3 shows the transmitted light Security element according to a replaceable embodiment of the present invention;
Fig. 4 shows the transmitted light Security element according to a replaceable embodiment of the present invention;
Fig. 5 shows the transmitted light Security element according to a replaceable embodiment of the present invention;
Fig. 6 shows the reflective optic Security element according to an embodiment of the invention;
Fig. 7 shows the reflective optic Security element according to an embodiment of the invention;
Fig. 8 shows the reflective optic Security element according to a replaceable embodiment of the present invention; And
Fig. 9 shows the reflective optic Security element according to a replaceable embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 a-1c shows the transmitted light Security element 1 according to an embodiment of the invention.As shown in the figure, provide a kind of optical anti-counterfeit element 1, comprise basic unit 101, and the optical module 102 be positioned at least part of region of basic unit 101, this optical module 102 can have diffraction micro structural, this diffraction micro structural is at least period profile in a direction, and the scope in cycle can be such as 0.3 μm-6 μm, is preferably 0.6 μm-3 μm.In the present embodiment, diffraction micro structural can be micro relief profile.For ease of describing, definition x-y-z space coordinates, micro relief profile can be positioned at xoy plane (or plane parallel plane with xoy).Dutycycle (width and the ratio of this jut with adjacent negative area overall width of jut) 0.2-0.8, the preferred 0.35-0.65 of micro relief profile.Fig. 1 a-1c is the generalized section of the Security element 1 according to an embodiment of the invention.As shown in Figure 1a, the section shape of the embossment unit of micro relief profile can be sinusoidal.As shown in Figure 1 b, the section shape of the embossment unit of micro relief profile can be zigzag.As illustrated in figure 1 c, the section shape of the embossment unit of micro relief profile can be rectangle.It will be appreciated by persons skilled in the art that the section shape of the embossment unit of micro relief profile can also be other shapes.The degree of depth d of micro relief profile meets the following conditions, namely when natural daylight (white light) irradiates micro relief profile with incidence angle α, light beam is by after micro relief profile, wavelength is that the light of λ (or a wave-length coverage) is interfered long mutually on transmitted light direction, thus make, when transmitted light direction viewing optics Security element 1, to present the first color.Because the cycle of this structure is in the scope of diffraction grating, so on diffraction light direction during viewing optics Security element 1, present rainbow effect, if according to cycle and the direction of the diffraction micro structural of the method design optical anti-counterfeit element 1 of existing diffraction light change image, diffraction light direction can be reproduced the effects such as innervation, solid, color change.
The degree of depth (difference in height of the adjacent highs and lows) d of micro relief profile, usually between 200nm-5 μm, is preferably 300nm-3 μm.Degree of depth d can be determined by following method.
1. the complex amplitude transmitance τ of micro relief profile is indicated
g, τ
gfor the grooved of degree of depth d, design wavelength lambda, micro relief profile, Refractive Index of Material distribution n and the function of position (x, y); 2. to complex amplitude transmitance τ
gcarry out Fourier Tranform; 3. the condition that transmitted light (i.e. zero order diffracted light) that wavelength is λ is maximum is found out; 4. the degree of depth d of micro relief profile is calculated according to the condition that transmitted light is maximum.
For example, design wavelength lambda=600nm, the refractive index n=1.5 of micro relief profile material, the section shape of micro relief profile 102 is sinusoidal, and external agency is air, then, during d=1528.8nm, Security element 1 presents redness on transmitted light direction.If d=2668.8nm, interfere phase elongate member, so Security element 1 presents carmetta on transmitted light direction because the now wavelength light that is 410.8nm also meets transmitted light.
Fig. 2 shows the transmitted light Security element 2 according to an embodiment of the invention.As shown in Figure 2, provide a kind of optical anti-counterfeit element 2, comprise basic unit 201, and be positioned at the optical module 202 at least part of region of basic unit 201, this optical module 202 can have the diffraction micro structural of period profile at least one direction.In the present embodiment, micro-structural can be micro relief profile.For ease of describing, definition x-y-z space coordinates.Micro relief profile can be positioned at xoy plane (or plane parallel plane with xoy), and the scope in the cycle of micro relief profile can be 0.3 μm-6 μm, is preferably 0.6 μm-3 μm.Micro relief profile dutycycle is 0.2-0.8, is preferably 0.35-0.65.The section shape of the embossment unit of micro relief profile can be sinusoidal.But it will be understood by those skilled in the art that the section shape of the embossment unit of micro relief profile can be zigzag, rectangle or other shapes.In the present embodiment, multiple regions that optical module 202 can be divided into the degree of depth different, such as region 2021 and 2022.And the degree of depth d of micro relief profile meets following condition, namely when natural daylight (white light) irradiates micro relief profile with incidence angle α, light beam is by after micro relief profile, the light that zones of different place has different wave length is interfered long mutually on transmitted light direction, thus makes the zones of different of described optical anti-counterfeit element 2 (such as 2021 and 2022) observe different colours on transmitted light direction.Such as, redness is observed in region 2021, green is observed in region 2021.
Micro relief profile degree of depth d, usually between 200nm-5 μm, is preferably 300nm-3 μm.Determine identical with a upper embodiment of the method for degree of depth d, repeat no more here.
Fig. 3 shows the transmitted light Security element 3 according to an embodiment of the invention.In the present embodiment, diffraction micro structural can be micro relief profile.The scope in the cycle of micro relief profile can be such as 0.3 μm-6 μm, is preferably 0.6 μm-3 μm.Micro relief profile dutycycle 0.2-0.8, is preferably 0.35-0.65.The section shape of the embossment unit of micro relief profile can be sinusoidal, zigzag, rectangle or other shapes.In the present embodiment, optical module can be divided into multiple region, micro-relief depth in zones of different is identical or different, its degree of depth d meets light that is identical or different wave length and interferes condition long mutually in transmission direction, makes zones of different observe identical or different color on transmitted light direction.The cycle of the micro relief profile in zones of different is different or all not identical with one of direction, and both can be one-dimensional grating structure, also can be two-dimensional grating structure, can also be other forms of arrangement architecture.Cycle of these micro relief profiles, direction and arrangement mode design according to the principle of usual diffraction light change image, make optical anti-counterfeit element 3 on diffraction light direction, present the effect such as innervation, multichannel, solid, color change of common diffraction light change image.
Micro relief profile degree of depth d, usually between 200nm-5 μm, is preferably 300nm-3 μm.Determine identical with first embodiment of the method for degree of depth d, repeat no more here.
Fig. 4 shows the transmitted light Security element 4 according to an embodiment of the invention.Optical module can be made up of multiple pixel, and each pixel comprises the raster unit of multiple micro relief profile.The cycle of the raster unit in each pixel is different, direction is identical, the light that degree of depth d meets a certain wavelength or wave-length coverage interferes phase elongate member in transmission direction, thus under white parallel light, this pixel presents a certain color on transmitted light direction, because the diffraction light of different cycles raster unit mixes mutually on diffraction light direction, thus make this pixel there is no rainbow effect, present the another kind of color being different from transmitted light.If the material of basic unit and raster unit is water white, the diffraction light color of pixel and transmitted light color are complementary colours.The pixel of same light grid bearing forms a kind of pattern.Grating orientation determines the viewing angle of this pixel, therefore by the grating orientation in design pixel, can realize the design sketch such as the color dynamic of non-rainbow (constant color), multichannel, solid.
Micro relief profile can make mother matrix by modes such as laser ablation, electron beam lithography, ion etchings, is then copied in basic unit by techniques such as electroforming, mold pressing, UV copy.More conventional technique is at the surface of basic unit coating imaging layer, is replicated in by micro relief profile on imaging layer, and object improves reproduction quality and the raising duplicating efficiency of micro relief profile.
The material forming micro relief profile can be such as ZnS, ZnO, Ta
2o
5, SnO
2, Nb
2o
5, HfO
2, In
2o
3, CeO
2, Dy
2o
3, Bi
2o
3, MgF
2, Al
2o
3, AlF
3, CaF
2, SiO
2, SrF
2, YbF
3, NaF, Na
3alF
6, PET, PVC, PE, polyester adhesive, polyurethane adhesive etc.
Described basic unit can be such as the transparent materials such as PET, PVC, PE.
Fig. 5 shows the optical anti-counterfeit element 5 according to replaceable embodiment of the present invention.As shown in the figure, provide a kind of optical anti-counterfeit element 5, comprise basic unit 501, and be positioned at the optical module 502 at least part of region of basic unit 501, this optical module 502 can have the diffraction micro structural of period profile at least one direction.In the present embodiment, diffraction micro structural can be variable refractivity micro-structural.For ease of describing, definition x-y-z space coordinates.Variable refractivity micro-structural can be positioned at xoy plane (or plane parallel plane with xoy), this variable refractivity micro-structural at least with refractive index periodic consecutive variations on the parallel plane direction of xoy, the scope in its cycle can be such as 0.3 μm-6 μm, is preferably 0.6 μm-3 μm.This embodiment is the micro relief profile substituting above-mentioned embodiment by variable refractivity micro-structural.The effect of variable refractivity micro-structural is identical with embossment structure, namely light beam irradiates described variable refractivity micro-structural with incidence angle α, wavelength is that the light of λ (or a wave-length coverage) meets interference phase elongate member on transmitted light direction, make irradiated area observe the first color on transmitted light direction, diffraction light direction is observed the effects such as innervation, solid, rainbow.
The defining method of the thickness d of this variable refractivity micro-structural is similar to the defining method of the degree of depth of above-mentioned micro relief profile, that is:
1. the complex amplitude transmitance τ of variable refractivity micro-structural is indicated
g, τ
gfor the function of variable refractivity micro-structural thickness d, design wavelength lambda, index distribution n (x, y, z); 2. to complex amplitude transmitance τ
gcarry out Fourier Tranform; 3. the condition that transmitted light (i.e. zero order diffracted light) that wavelength is λ is maximum is found out; 4. according to the maximum condition determination variable refractivity micro-structural thickness d of transmitted light or index distribution n (x, y, z).
This variable refractivity micro-structural can be formed by such as laser interferance method.After the exposure of some photosensitive material, refractive index can change, such as silver sensitive material, (bichromate gelatin) etc.The refractive index distribution structure of requirement can be met by adopting laser interferance method exposure to these materials.
Fig. 6 shows the reflective optic Security element 6 according to an embodiment of the invention.As shown in Figure 6, provide a kind of optical anti-counterfeit element 6, comprise basic unit 601 and be positioned at the optical module 602 at least part of region of basic unit 601, this optical module 602 can have the diffraction micro structural of period profile at least one direction, and reflecting layer 603.This diffraction micro structural can comprise micro relief profile, and reflecting layer 603 can between basic unit 601 and optical module 602.In the present embodiment, reflecting layer can be such as metallic reflector.For convenience of description, x-y-z space coordinates are defined.Micro relief profile can be positioned at xoy plane (or plane parallel plane with xoy), and the scope in cycle can be such as 0.3 μm-6 μm, is preferably 0.6 μm-3 μm.Micro relief profile dutycycle is 0.2-0.8, is preferably 0.35-0.65.The section shape of the embossment unit of micro relief profile can be sinusoidal, zigzag, rectangle or other shapes.The degree of depth d of micro relief profile meets the following conditions, namely when natural daylight (white light) irradiates micro relief profile with incidence angle α, light beam reflects by micro relief profile and by reflecting layer 603 and passes through micro relief profile again, wavelength is that the light of λ (or a wave-length coverage) is interfered long mutually on reverberation direction, thus make when reverberation direction viewing optics Security element 6, present the first color, because the characteristic size of this structure is in the scope of diffraction grating, therefore observe on diffraction light direction and present rainbow effect, if according to cycle and the direction of the diffraction micro structural of the method design optical anti-counterfeit element of existing diffraction light change image, innervation can be reproduced in diffraction light direction, three-dimensional, the effects such as color change.
The material forming metallic reflector 603 can comprise such as gold, silver, copper, iron, tin, nickel, chromium, aluminium, zinc, titanium and titanium alloys, and thickness can be greater than 5nm, is preferably greater than 10nm.Described reflecting layer 603 can be hollow out, and openwork part and non-openwork part (i.e. metallic member) can form distinguishable pattern.
The degree of depth d of micro relief profile, usually at 100nm-3 μm, is preferably 150nm-2 μm.Degree of depth d can be determined by following method:
1. the complex amplitude reflectivity τ of micro relief profile is indicated
g, τ
gfor the function of degree of depth d, design wavelength lambda, micro relief profile Refractive Index of Material n, position (x, y); 2. to complex amplitude reflectivity τ
gcarry out Fourier Tranform; 3. the condition that reverberation (i.e. zero order diffracted light) that wavelength is λ is maximum is found out; 4. micro relief profile degree of depth d is calculated according to the condition that reverberation is maximum.
Fig. 7 shows the reflective optic Security element 6 according to an embodiment of the invention.As shown in the figure, provide a kind of optical anti-counterfeit element 7, comprise basic unit 701 and be positioned at the optical module 702 at least part of region of basic unit 701, this optical module 702 can have the diffraction micro structural of period profile at least one direction, and reflecting layer 703.This micro-structural can be micro relief profile, reflecting layer 703 can and between this basic unit 701 and optical module 702.In the present embodiment, reflecting layer 703 can be such as metallic reflector.For convenience of description, x-y-z space coordinates are defined.Micro relief profile can be positioned at xoy plane (or plane parallel plane with xoy), and the scope in cycle can be such as 0.3 μm-6 μm, preferably 0.6 μm-3 μm.The dutycycle 0.2-0.8 of micro relief profile, be preferably 0.35-0.65.The section shape of micro-embossment unit can be sinusoidal, zigzag, rectangle or other shapes.In the present embodiment, multiple regions that micro relief profile can be divided into the degree of depth different, such as region 7021 and 7022.And the degree of depth d of micro relief profile can meet following condition, namely when natural daylight (white light) irradiates micro relief profile with incidence angle α, light beam is by after micro relief profile, the light that zones of different place has different wave length is interfered long mutually on reverberation direction, thus makes the zones of different of described optical anti-counterfeit element 7 (such as 7021 and 7022) observe different colours on reverberation direction.Such as, redness is observed in region 7021, green is observed in region 7021.
The degree of depth d of micro relief profile, usually at 100nm-3 μm, is preferably 150nm-2 μm.Determine identical with a upper embodiment of the method for degree of depth d, repeat no more here.
In a replaceable embodiment of the present invention, optical module can be divided into multiple region, and the relief depth in zones of different is identical or different, makes zones of different observe identical or different color on reverberation direction.The cycle of the micro relief profile in zones of different is different with one of direction or the two is all not identical, and both can be one-dimensional grating structure, also can be two-dimensional grating structure, can also be other forms of arrangement architecture.Cycle of these micro relief profiles, direction and arrangement mode design according to the principle of diffraction light change image, make optical anti-counterfeit element on diffraction light direction, present the effect such as innervation, multichannel, solid, rainbow of common diffraction light change image.
In a replaceable embodiment of the present invention, optical module can comprise multiple pixel, and each pixel comprises multiple raster units of micro relief profile.The cycle of the raster unit in each pixel is different, direction is identical, the light that degree of depth d meets a certain wavelength or wave-length coverage interferes phase elongate member on reflection direction, thus under white parallel light, this pixel presents a certain color on reverberation direction, the diffraction light of the raster unit due to different cycles on diffraction light direction mixes mutually, thus make this pixel there is no rainbow effect, present the another kind of color being different from reverberation.If the material in reflecting layer is the such as metal to wavelength non-selectivity such as silver, aluminium, then the diffraction light color of this pixel and reverberation color are complementary colours.The pixel of same light grid bearing forms a kind of pattern.Grating orientation determines the viewing angle of this pixel, therefore by the grating orientation in design pixel, can realize the design sketch such as the color dynamic of non-rainbow (constant color), multichannel, solid.
Micro relief profile can make mother matrix by modes such as laser ablation, electron beam lithography, ion etchings, is then copied in basic unit by techniques such as electroforming, mold pressing, UV copy.More conventional technique is at the surface of basic unit coating imaging layer, is replicated in by micro relief profile on imaging layer, and object improves reproduction quality and the raising duplicating efficiency of micro relief profile.
The material forming micro relief profile can be such as ZnS, ZnO, Ta
2o
5, SnO
2, Nb
2o
5, HfO
2, In
2o
3, CeO
2, Dy
2o
3, Bi
2o
3, MgF
2, Al
2o
3, AlF
3, CaF
2, SiO
2, SrF
2, YbF
3, NaF, Na
3alF
6, PET, PVC, PE, polyester adhesive, polyurethane adhesive etc.
When reflective optic Security element, described basic unit can be such as the transparent materials such as PET, PVC, PE, also can be the transparent, translucent of other or opaque material.
Fig. 8 is the reflective optic Security element 8 according to replaceable embodiment of the present invention.As shown in the figure, provide a kind of optical anti-counterfeit element 8, comprise basic unit 801 and be positioned at the diffraction micro structural at least part of region of basic unit 801; And reflecting layer 803.This diffraction micro structural can be the variable refractivity micro-structural 802 of period profile at least one direction, and reflecting layer 803 can between basic unit 801 and variable refractivity micro-structural 802.In the present embodiment, reflecting layer 803 can be such as metallic reflector.For convenience of description, x-y-z space coordinates are defined.Variable refractivity micro-structural 802 can be positioned at xoy plane (or plane parallel plane with xoy), and the scope in its cycle can be such as 0.3 μm-6 μm, is preferably 0.6 μm-3 μm.This embodiment is the micro relief profile substituting above-mentioned embodiment by variable refractivity micro-structural 802.The effect of variable refractivity micro-structural 802 is identical with embossment structure, namely light beam irradiates described variable refractivity micro-structural 802 with incidence angle α, wavelength is that the light of λ (or a wave-length coverage) meets interference phase elongate member on reverberation direction, make this region observe the first color on reverberation direction, the effects such as innervation, multichannel, solid, rainbow are observed in diffraction light direction.
Fig. 9 shows the optical anti-counterfeit element 9 according to an embodiment of the invention.As shown in the figure, provide a kind of optical anti-counterfeit element 9, comprise basic unit 901 and be positioned at the diffraction micro structural of at least one direction period profile of basic unit 901 at least partly on region; And reflecting layer 903.This diffraction micro structural can comprise micro relief profile 902, and micro relief profile 902 is positioned in basic unit 901, and reflecting layer 903 covers the surface of this micro relief profile 902 along with the surface profile of micro relief profile 902.This reflecting layer 903 can be metallic reflector.For ease of describing, definition x-y-z space coordinates.Micro relief profile 902 can be positioned at xoy plane (or plane parallel plane with xoy), and the scope in its cycle can be such as 0.3 μm-6 μm, is preferably 0.6 μm-3 μm.The dutycycle 0.2-0.8 of micro relief profile 902, is preferably 0.35-0.65.The section shape of the embossment unit of micro relief profile 902 can be sinusoidal, zigzag, rectangle or other shapes.Thus, the contour shape of metallic reflector 903 also can be sinusoidal, zigzag, rectangle or other shapes.The degree of depth d of micro relief profile 902 can by following conditional decision, namely when natural daylight (white light) irradiates micro relief profile 902 with incidence angle α, light beam is reflected by metallic reflector 903, wavelength is made to be that the light of λ (or a wave-length coverage) is interfered long mutually on reverberation direction, thus make described optical anti-counterfeit element 9 observe the first color on reverberation direction, diffraction light direction is observed the effects such as innervation, solid, rainbow.
The degree of depth d of micro relief profile 902, usually at 70nm-3 μm, is preferably 120nm-2 μm.Determine identical with a upper embodiment of the method for degree of depth d, repeat no more here.
The material forming metallic reflector 903 can comprise such as gold, silver, copper, iron, tin, nickel, chromium, aluminium, zinc, titanium and titanium alloys, and thickness can be greater than 5nm, is preferably greater than 10nm.Preferably, described reflecting layer 903 can be hollow out, and openwork part and non-openwork part (i.e. metallic member) form distinguishable pattern.
The material of basic unit can be such as the materials such as PET, PVC, BOPP, also can be metal material, namely direct at metal-based layer surface formation micro relief profile.
In a replaceable embodiment with reference to the embodiment shown in Fig. 9, micro relief profile can be by can making the material that light reflects, can not needing reflecting layer thus.
In order to protect surface micro relief structure; increase the service life of product; usually can at the coating of the surface of micro relief profile or evaporation protective layer, the material of protective layer can be the thin-film materials such as PET, PVC, PE, also can be the various macromolecule glue such as polyester, polyurethane.It is poor to be there is suitable specific refraction in the material of protective layer and micro relief profile material, and the refringence of the two is more preferably greater than 0.3, otherwise the relief depth that may be increases difficulty of processing too greatly.
The Security element of the application can the embossment structure of integrated multiple other types, such as common diffraction light change image, blazed grating structure etc.
The Security element of the application can also be thermoprint type, namely on base material, is coated with peel ply, then on peel ply, make Security element of the present invention, and after it is transferred to carrier by application hot stamping process, base material strips down.
The Security element of the application, further with other functional layers, as magnetic information layer, fluorescence falsification preventing characteristic layer, printing pattern layer, coheres glue-line etc.
The Security element of the application can be applied to the form transfers such as mark, the wide bar of thermoprint, joint strip, safety line or paste on carrier.These carriers can be banknote, security, credit card, the contour safety product of passport, also can be high added value commodity.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.Such as, the embodiment of transmission-type Security element can be combined, the embodiment of reflective Security element is combined, maybe the embodiment of transmission-type and reflective Security element can be combined.Such as, can both adopt transmission-type element on a Security element, adopt reflecting element again.And in transmission-type element, micro relief profile both can have been used can to use variable refractivity micro-structural.And the various pattern in above-mentioned embodiment or combination can be adopted in micro relief profile.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (15)
1. an optical anti-counterfeit element, this element comprises:
Basic unit; And
Be positioned at the optical module at least part of region of described basic unit, this optical module has the diffraction micro structural of period profile at least one direction, the scope in cycle is 0.3 μm-6 μm, this diffraction micro structural is defined by when light beam irradiates described micro-structural with an incidence angle, and in this light beam, the light of a wavelength or wave-length coverage presents the first color on transmitted light direction.
2. element according to claim 1, wherein, described diffraction micro structural be micro relief profile at least partially, the degree of depth of this micro relief profile meets the following conditions:
When described light beam with an incidence angle irradiate described micro relief profile at least partially time, this light beam by this micro relief profile at least partially after, in this light beam, the light of a wavelength or wave-length coverage is interfered long mutually on transmitted light direction, thus described optical anti-counterfeit element on transmitted light direction, present the first color at least partially.
3. element according to claim 2, wherein, described optical module comprises multiple region, and the degree of depth of the micro relief profile at least two regions in the plurality of region is different, makes at least two regions present different colors on transmitted light direction.
4. element according to claim 2, wherein, described optical module comprises multiple region, and the cycle of the micro relief profile in zones of different, direction that is different and/or micro relief profile was different.
5. element according to claim 2, wherein, described optical module comprises multiple pixel, and each pixel comprises the raster unit of multiple micro relief profile, and the cycle of the multiple raster units in each pixel is different, direction is identical.
6. element according to claim 1, wherein, described diffraction micro structural be variable refractivity micro-structural at least partially, the thickness of this variable refractivity micro-structural meets the following conditions:
When described light beam irradiates described variable refractivity micro-structural with an incidence angle, this light beam is by after this variable refractivity micro-structural, in this light beam, the light of a wavelength or wave-length coverage is interfered long mutually on transmitted light direction, thus described optical anti-counterfeit element on transmitted light direction, present the first color at least partially, diffraction light direction presents the second color.
7. an optical anti-counterfeit element, this element comprises:
Basic unit;
Be positioned at the optical module at least part of region of described basic unit, this optical module have period profile at least one direction diffraction micro structural, the scope in cycle is 0.3 μm-6 μm; And
Reflecting layer between described basic unit and described micro-structural, this micro-structural is defined by when light beam irradiates described micro-structural with an incidence angle, and in this light beam, the light of a wavelength or wave-length coverage presents the first color on reverberation direction.
8. element according to claim 7, wherein, described diffraction micro structural be micro relief profile at least partially, the degree of depth of this micro relief profile meets the following conditions:
When described light beam with an incidence angle irradiate described micro relief profile at least partially time, this light beam by this micro relief profile at least partially and by after described reflective layer reflects, in this light beam, the light of a wavelength or wave-length coverage is interfered long mutually on reverberation direction, thus described optical anti-counterfeit element on reverberation direction, present the first color at least partially.
9. element according to claim 8, wherein, described optical module comprises multiple region, and the degree of depth of the micro relief profile at least two regions in the plurality of region is different, makes at least two regions present different colors on reverberation direction.
10. element according to claim 8, wherein, described optical module comprises multiple region, and the cycle of the micro relief profile in zones of different, direction that is different and/or micro relief profile was different.
11. elements according to claim 8, wherein, described optical module comprises multiple pixel, and each pixel comprises the raster unit of multiple micro relief profile, and the cycle of the multiple raster units in each pixel is different, direction is identical.
12. elements according to claim 7, wherein, described diffraction micro structural be variable refractivity micro-structural at least partially, the thickness of this variable refractivity micro-structural meets the following conditions:
When described light beam with an incidence angle irradiate described variable refractivity micro-structural at least partially time, this light beam by this variable refractivity micro-structural at least partially and by after described reflective layer reflects, in this light beam, the light of a wavelength or wave-length coverage is interfered long mutually on reverberation direction, thus described optical anti-counterfeit element on reverberation direction, present the first color at least partially.
13. elements according to claim 7-12 any one claim, wherein, described reflecting layer be hollow out at least partially, openwork part and non-openwork part form distinguishable pattern.
14. 1 kinds of optical anti-counterfeit elements, this element comprises:
Basic unit;
To be positioned at least part of region of described basic unit period profile at least one direction diffraction micro relief profile, the scope in cycle is 0.3 μm-6 μm; And
Along the reflecting layer that described diffraction micro relief profile surface profile covers, the degree of depth of this micro-structural meets the following conditions:
When light beam irradiates described reflecting layer with an incidence angle, in this light beam, the light of a wavelength or wave-length coverage is interfered long mutually on reverberation direction, and described optical anti-counterfeit element presents the first color on reverberation direction thus.
15. elements according to claim 14, wherein, described reflecting layer be hollow out at least partially, openwork part and non-openwork part form distinguishable pattern.
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| CN108466504A (en) * | 2017-02-23 | 2018-08-31 | 中钞特种防伪科技有限公司 | Optical anti-counterfeit element and optical anti-counterfeiting product |
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| CN110843369B (en) * | 2019-11-22 | 2021-10-22 | 浙江京华激光科技股份有限公司 | Die-free press polished grating film and manufacturing process thereof |
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| CN115657182B (en) * | 2022-11-11 | 2024-03-12 | 上海镭望光学科技有限公司 | Transflective double-sided diffraction optical element and manufacturing method thereof |
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Address after: 100070 No. 6 Spark Road, Science City, Beijing, Fengtai District Patentee after: ZHONGCHAO SPECIAL SECURITY TECHNOLOGY Co.,Ltd. Patentee after: China Banknote Printing and Minting Group Co.,Ltd. Address before: 100070 No. 6 Spark Road, Science City, Beijing, Fengtai District Patentee before: ZHONGCHAO SPECIAL SECURITY TECHNOLOGY Co.,Ltd. Patentee before: China Banknote Printing and mint General Company |