CN108656782A - Optical anti-counterfeit element, the product and preparation method thereof using the optical anti-counterfeit element - Google Patents
Optical anti-counterfeit element, the product and preparation method thereof using the optical anti-counterfeit element Download PDFInfo
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- CN108656782A CN108656782A CN201710192199.6A CN201710192199A CN108656782A CN 108656782 A CN108656782 A CN 108656782A CN 201710192199 A CN201710192199 A CN 201710192199A CN 108656782 A CN108656782 A CN 108656782A
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- reflective type
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- type element
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/351—Translucent or partly translucent parts, e.g. windows
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/324—Reliefs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/40—Manufacture
- B42D25/45—Associating two or more layers
Abstract
The present invention relates to optical anti-counterfeiting field, a kind of optical anti-counterfeit element, the product and preparation method thereof using the optical anti-counterfeit element are disclosed.Wherein, the optical anti-counterfeit element includes：Base material；The reflective type element being formed at least one surface of the base material；At least partially cover over the sub-wavelength structure on the reflective type element；And it is deposited on the coating on the sub-wavelength structure and reflective type element not covered with the sub-wavelength structure.The optical anti-counterfeit element of the present invention cooperates to be formed two kinds of differences of reflective observing and viewed in transmittance but relevant color dynamic effect by reflective type element, the sub-wavelength structure being covered on reflective type element and coating.
Description
Technical field
The present invention relates to optical anti-counterfeiting fields, and in particular, to a kind of optical anti-counterfeit element uses the optical anti-counterfeit element
Product and preparation method thereof.
Background technology
Light become coating technology be widely used in the contour anti-fake marketable securities of banknote the public it is anti-fake in, in different observations
Different colors can be presented under angle, convenient for description, be easy to public's identification, and camera, scanner, printer can not be utilized
Equal electronic equipments are imitated or are replicated, so having very high anti-counterfeit capability.
But having had the time of many decades since light becomes products application, simple light becomes coating technology cannot be very
Meets the needs of anti-counterfeit field well.Light change is characterized in that anti-fake product generates color change as viewing angle changes.People
Eye has a more sensitive capturing ability for the image of variation, thus the characteristics of this color changes with angle change be easy to by
Observation cognition.In addition, on the basis of color change, it can also be further added by a dynamic feature, increase a kind of identification dimension, shape
It is superimposed at the combination of " color+innervation " two kinds of effects, to promote the anti-counterfeit capability of this kind of optical anti-counterfeit element.
For example, SICPA companies of Switzerland become face by crushing five layers of light change coating structure with symmetrical structure to form light
Expect (OVP), and then obtain photochromatic printing ink (OVI), can be combined with printing technology, and has been obtained extensively in a variety of banknotes in the world
General application.As the further development of OVI, one layer of magnetosphere of increase is formed light metamagnetism ink in existing smooth structure changes
(OVMI), i.e. SPARK technologies.The technology enables OVMI particles along magnetic induction line direction oriented alignment by induced by magnetic field, from
And form specific picture and text structure.When particle arrangement has the variation of specific rule in OVMI, the light such as dynamic, scaling can be generated
Learn feature.But since the oriented alignment of light metamagnetism particle needs to rely on magnetic field, therefore restricted by magnetic field shape, it cannot be right
Shape progress is arbitrarily devised, and needs specific orientation equipment and technique.Simultaneously as above-mentioned dynamic based on magnetic optically color
In photosensitive change design, under the conditions of two kinds of reflective observing and viewed in transmittance, the optical anti-counterfeiting product color having the same of formation,
To observe that optically variable effect distinguishes unobvious from reflective viewing conditions and viewed in transmittance condition.Also, due to above-mentioned color
It is that it is anti-fake to cannot achieve itself effective expert based on principle of interference, therefore reflected light no polarization feature to generate principle.If needed
Increase expert's security element, it is necessary to be further added by corresponding design element, the original structure of optical anti-counterfeiting product will necessarily be destroyed.
Invention content
The purpose of the present invention is in view of the above-mentioned drawbacks in the prior art, provide a kind of optics that can overcome drawbacks described above
Security element, the product and preparation method thereof using the optical anti-counterfeit element.
To achieve the goals above, the present invention provides a kind of optical anti-counterfeit element, which includes：Base
Material is configured as transparent base or translucent base material；The reflection-type member being formed at least one surface of the base material
Part；At least partially cover over the sub-wavelength structure on the reflective type element；And it is deposited on the sub-wavelength structure and not
The coating being covered on the reflective type element of the sub-wavelength structure.
Optionally, the base material includes first surface and second surface, and the reflection-type is formed on the first surface
Element, and the first surface, the second surface and/or the reflective type element are attached on transparent carrier.
Optionally, the reflective type element is reflecting surface mirror or balzed grating,.
Optionally, the reflective type element has variable azimuth.
Optionally, the sub-wavelength structure is sub-wavelength micro relief profile, and the sub-wavelength micro relief profile includes Asia
Wave length grating.
Optionally, the coating be high refractive index material layer or by high refractive index material layer and low refractive index material layer successively
The dielectric stack constituted is laminated.
Optionally, the dielectric stack has Fabry-Perot cavity filter structure.
Optionally, the orientation of the sub-wavelength structure and the reflective type element is identical or different.
The present invention also provides a kind of products using above-mentioned optical anti-counterfeit element.
The present invention also provides a kind of preparation method of optical anti-counterfeit element, which includes：Base material, and institute are provided
It states base material and is configured as transparent base or translucent base material；Reflective type element is formed at least one surface of the base material；
Sub-wavelength structure is covered at least partly on the reflective type element；And in the sub-wavelength structure and not covered with described
Deposited plating layer on the reflective type element of sub-wavelength structure.
Optionally, wherein：The offer base material includes：Offer includes the transparent base or half of first surface and second surface
Transparent base；Also, the reflective type element is formed on the first surface, and by the first surface, second table
Face and/or the reflective type element are attached on transparent carrier.
Optionally, reflective type element is formed at least one surface of the base material includes：Pass through the electron beam directly side of quarter
Method or laser scribing method make reflecting surface mirror or balzed grating, using as the reflective type element, and configure in the production process
The azimuth of reflecting surface mirror or balzed grating, has variation, then the reflecting surface mirror or the balzed grating, are formed in the base
On at least one surface of material.
Optionally, the sub-wavelength structure that covered at least partly on the reflective type element includes：Make sub-wavelength
Grating keeps the sub-wave length grating identical as the orientation of the reflective type element or not using as the sub-wavelength structure
Together, then the sub-wave length grating is made at least partly to cover the reflective type element.
Optionally, the coating be high refractive index material layer or by high refractive index material layer and low refractive index material layer successively
The dielectric stack constituted is laminated.
Through the above technical solutions, the beneficial effects of the invention are as follows：The optical anti-counterfeit element of the present invention passes through reflection-type member
Part, the sub-wavelength structure being covered on reflective type element and coating cooperate to be formed reflective observing and viewed in transmittance two
Plant different but relevant color dynamic effect, the preparation work that the anti-counterfeit capability of optical anti-counterfeit element can be effectively improved, and be related to
Skill flow is simple, does not need special high capital equipment, and the surface topography of easily controllable element.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Attached drawing is to be used to provide further understanding of the present invention, an and part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 (a) is the structural schematic diagram of sub-wave length grating and the element of single layer high-index material formation；
Fig. 1 (b) is the spectrogram of the reflected light and incident light of the element of Fig. 1 (a)；
Fig. 2 (a) is the structural schematic diagram of the optical anti-counterfeit element of the embodiment of the present invention；
Fig. 2 (b) is the inclined effect diagram that different angle is carried out to the optical anti-counterfeit element of Fig. 2 (a)；
Fig. 2 (c) is the signal for the example that the optical anti-counterfeit element of Fig. 2 (a) is combined using dielectric stack with sub-wavelength structure
Figure；
The appearance diagram of the example optical Security element of Fig. 3 (a)-Fig. 3 (d) embodiment of the present invention；
Fig. 4 is that reflective type element has variable azimuthal schematic diagram in the embodiment of the present invention；
Fig. 5 (a)-Fig. 5 (d) is the appearance of the color dynamic optical anti-counterfeit element with OVMI effects in the embodiment of the present invention
Schematic diagram；
Fig. 6 (a) and Fig. 6 (b) is showing for the arrangement mode of two different one-dimensional sub-wave length gratings and balzed grating, respectively
It is intended to, Fig. 6 (c) is the schematic diagram that the surface portion of balzed grating, covers one-dimensional sub-wave length grating, and Fig. 6 (d) is optical anti-counterfeiting member
The color coordinates of part different zones generates the schematic diagram of variation with viewing angle；And
Fig. 7 is the flow diagram of the preparation method of the kind optical anti-counterfeit element of the embodiment of the present invention.
Reference sign
1 base material, 2 first micro-structure
3 second micro-structure, 4 coating
5 the first colors of incident light 6/6a/6b
7 second color, 8 reflective observing direction
9 viewed in transmittance direction, 10 transparent carrier
31 sub-wave length grating 4H high refractive index material layers
601 one-dimensional sub-wave length grating of 4L low refractive index material layers
602 balzed grating, 603 region I
604 region II, 605 dielectric stacks
Specific implementation mode
The specific implementation mode of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific implementation mode stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The characteristics of in order to which optical anti-counterfeit element of the invention is more clearly illustrated, comes exemplary with reference to Fig. 1
The invention thinking and principle of the present invention are described.
Fig. 1 (a) shows sub-wave length grating and the element that single layer high-index material is formed, and has Asia wherein on base material 1
Wave length grating 31, and deposited high refractive index material layer 4H on the sub-wave length grating 31, and base material 1 is transparent base.When white
When the incident light 5 of color is irradiated to the element, reflected light can be generated, forms the first color 6 under reflective viewing conditions, and
Transmitted light forms the second color 7 under the conditions of viewed in transmittance.
Specifically, when incident light 5 is incident on 31 surface of sub-wave length grating, sub-wave length grating 31 generates tune to incident light 5
System.Shown in Fig. 1 (a), incident light 5 is the natural light of no polarization feature, by extending along the y-axis direction shown in such as Fig. 1 (a) along x
After the sub-wave length grating 31 of axis direction arrangement is modulated, reflected light is TE waves, and transmitted light is TM waves.The electric vector of wherein TE waves is vertical
It is parallel to the plane of incidence in the electric vector of the plane of incidence, TM waves, the definition of the plane of incidence is normal and the plane that incident light wave vector is formed.
In the case where the surface of base material 1 is flat surfaces, passed through using Maxwell equation calculations electric field and magnetic vector
The intensity and phase change of each layer and each interface are crossed, and considers boundary condition, is produced in face of light with obtaining each layer and all circles
Raw phase difference and strength variation parameter.When specific calculating, single coating (such as high refractive index material layer 4H) or multilayer can be plated
Layer (dielectric stack involved by following article) and its interface are thought of as virtual equivalent interface, and admittance and film layer are combined by calculating
Eigenmatrix obtain all information propagated in coating of light, especially intensity with the variation relation of wavelength, i.e. coating
Reflectance spectrum.The face in CIE color spaces that integral obtains coating is carried out finally by by reflectance spectrum and tristimulus values function
Chromaticity coordinates.Above procedure can carry out simulation calculating using existing business software.
When the surface of base material 2 has sub-wavelength embossment structure (such as sub-wave length grating 31), the optical signature of the element
By the period of sub-wavelength embossment structure, groove depth, groove profile and according to parameters such as each layer thickness of the coating of element, Refractive Index of Material
It codetermines.When design, rigorous coupled wave method (RCW), Finite-Difference Time-Domain Method (FDTD) isovector diffraction theory, knot need to be utilized
Close Boundary Condition for Solving maxwell equation group.Though Vector Diffraction Theory have in the prior art it is detailed discuss (, due to micro-
The complex characteristics of structure, coating structure, materials optical parameter and boundary condition, there is presently no it is a it is general, function is complete
Calculating design software.Existing business software such as Rsoft, Gsolver, Optiwave etc. are confined to solve a certain or several
The specific problem of kind.Therefore, according to the concrete condition of problem and it need to realize that optical signature design is calculated from basic theories
Method, program calculation, it is final to determine various aspects design parameter, such as the groove depth of sub-wavelength embossment structure, groove profile, duty ratio and x
Characteristic size on direction or/and the directions y.
Therefore, for the element of Fig. 1 (a), it is assumed that the sub-wavelength frequency of sub-wave length grating 31 is 2900 lines/mm, sub-wavelength
Gash depth is 200nm, and the material of high refractive index material layer 4H is TiO2, and thickness is 160nm, then passes through the above-mentioned meter being related to
It calculates, reflected light spectrum and transmitted light spectrum as shown in Fig. 1 (b) can be obtained.From in spectrogram as it can be seen that under reflective viewing conditions
Yellow green is presented near 550nm in reflected light wave crest；Transmitted light under the conditions of viewed in transmittance is minimum value wave near 550nm
Paddy, wave crest are located at after 700nm, present red.Here, reflectance spectrum and transmitted spectrum are complementary, color complementary color each other.
Therefore, the element shown for Fig. 1 (a), in reflective observing direction 8 and viewed in transmittance direction 9, observer can see
The first color 6 and the second color 7 arrived is complementary colours.
Accordingly, it is known that sub-wave length grating is superimposed upon on single layer high-index material, corresponding element can form reflection
Observe different with two kinds of viewed in transmittance but relevant color change effect.Based on this principle, an embodiment of the present invention provides one
Kind optical anti-counterfeit element, as shown in Fig. 2 (a), which includes：Base material 1 is configured as transparent base or half
Transparent base；The reflective type element being formed at least one surface of the base material 1, the reflective type element form first micro- knot
Structure 2；The sub-wavelength structure on the reflective type element is at least partially covered over, which forms the second micro-structure 3；
And it is deposited on the coating 4 on the sub-wavelength structure and reflective type element not covered with the sub-wavelength structure, i.e. coating 4
It is covered in the first micro-structure 2 and the second micro-structure 3.
Wherein, in order to observing the dynamic feature of this positive and negative complementary colors, institute from reflection direction and transmission direction
Stating base material 1 selects transparent base or translucent base material, the transparent material of wherein transparent base to may, for example, be epoxy resin, propylene
Acid, polyurethane, polyamide, UV solidification glues etc..
Wherein, the sub-wavelength structure of the second micro-structure 3 is preferably sub-wavelength micro relief profile, and the micro- embossment of the sub-wavelength
Structure can select sub-wave length grating shown in Fig. 1 (a), and the coating 4 can be single layer height folding shown in Fig. 1 (a)
Penetrate rate material layer.Therefore, the second micro-structure 3 is combined with coating 4, two kinds of differences of reflective observing and viewed in transmittance can be formed but
Relevant color change effect.
The present embodiment forms reflective type element at least one surface of base material 1, and the reflective type element is preferably anti-
Penetrate face mirror or balzed grating, it is different to interference, the diffraction of incident light from sub-wavelength structure and coating, reflective type element by
It is larger in size, incident light salt free ligands are acted on, the color of light cannot be changed, and only change the direction of propagation of light.It is logical
Crossing the arrangement mode of change reflective type element can be such that incident light is reflected to different directions, and realization is observed under different angle
Different specific positions realizes the dynamic effect in visual effect, and sub-wavelength structure is superimposed upon on reflective type element, then
Certain thickness coating is deposited, color change effect is increased on dynamic effect, one is increased in the embodiment of optical effect
A dimension.
It should be noted that the reflecting surface mirror includes plane mirror and has the face mirror of curvature, the embodiment of the present invention is not intended to limit
In this.
Specifically, with reference to figure 2 (a), first micro-structure 2, can be to reflected light and transmitted light by arrangement appropriate
Modulation is formed, dynamic effect is formed.Wherein, the arrangement mode of adoptable second micro-structure can be such as：Pass through second micro- knot
The inclination angle of structure (reflecting surface mirror or balzed grating) is different, can be arranged in order, so first when tilting sample as shown in Fig. 2 (a)
When part, incident light is transmitted to observer by the balzed grating, of different zones successively, forms the dynamic effect of rolling.Described second is micro-
Structure 3 and 4 collective effect of coating can be modulated incident light 5, form the first color 6 in reflective observing direction 8, transmiting
Direction of observation 9 forms the second color 7, the first color 6 and the second color 7 complementary color each other.First micro-structure 2, second micro- knot
4 collective effect of structure 3 and coating can form the coloured dynamic effect of tool in reflective observing direction 8 and viewed in transmittance direction 9,
And first color 6 (reflection colour) and the second color 7 (saturating color color) complementary color each other.
Further, the base material 1 may include first surface and second surface, is formed on the first surface described
Reflective type element, and the first surface, the second surface and/or the reflective type element are attached on transparent carrier 10.
Here, the first surface, the second surface and/or the reflective type element, which are attached on transparent carrier, is specifically appreciated that
For：The first surface is not formed in part, the second surface and the reflective type element of the reflective type element
Any one or more persons (the two and whole) can adhere on transparent carrier.
Wherein it is possible to which the corresponding portion of optical anti-counterfeit element is attached to transparent carrier 10 by the method for thermoprint, transfer
On, form two kinds of differences of reflective observing and viewed in transmittance but relevant color dynamic effect.Wherein, in order to observing this
The color dynamic effect of the positive and negative complementary colors of kind, transparent carrier 10 should be transparent material or trnaslucent materials, the transparent material
Such as polyethylene terephthalate (PET), Biaxially oriented polypropylene (BOPP), makrolon (PC), polyethylene (PE) etc..
Fig. 2 (b) shows reflection colour when optical anti-counterfeit element is in different angle of inclination.Specifically, work as oblique light
When learning Security element, observer is observed that the first color 6, continues oblique optical Security element, it is observed that the first face
Color 6a, oblique optical Security element again, it is observed that the first color 6b.This variation to observer with a kind of impression,
Feel that movement has occurred with oblique optical Security element on Security element surface in bright region, so as to form innervation
Effect.
Further, in order to improve the saturation degree of optical anti-counterfeit element color, more bright-coloured colorful color is presented, except single
Outside the high refractive index material layer of layer, " high refractive index/low-refraction/high refractive index/low can also be deposited in the second micro-structure 3
Refractive index ... " pattern stacks gradually the dielectric stack constituted by high refractive index material layer and low refractive index material layer, i.e. institute
The dielectric stack can be selected by stating coating 4.
Fig. 2 (c) has gone out " high refractive index material layer 4H, low refractive index material layer 4L, high refractive index material layer 4H " formation
The example of three layers of dielectric stack.Preferably, which has Fabry-Perot cavity filter structure, to incidence
There is white light selection index system, emergent ray only to include the light of certain wave bands, form specific color；But when incident angle changes
When, corresponding light path changes, and interference wave band changes, and causes the color presented also to change therewith, to be in
Existing optically variable effect.
When three layers of dielectric stack light structure changes are combined with sub-wavelength micro relief profile, interference and diffraction collective effect can be with
Its all band is obtained, this effect is related to the incident angle of light, equally obtains a kind of optically variable effect.Thus by primary
Light structure changes are deposited and obtain two kinds of optically variable effects.When suitably the eigenperiod of selection sub-wavelength micro relief profile joins with dielectric stack
Number, may be implemented homochromy asynchronous phenomenon, i.e., under a viewing angle, the micro- embossment region of sub-wavelength and the micro- embossment of no sub-wavelength
The reflection/transmission spectrum of plane domain is different but color is same or similar；When viewing angle changes, the two optically variable effect
Difference respectively undergoes different light and becomes process, creates a difference.
Preferably for three layers of dielectric stack light structure changes and sub-wavelength micro relief profile, for example, the Asia of sub-wavelength structure
Wave frequency is 3900 lines/mm, sub-wavelength depth 200nm, high-index material ZnS, thickness 180nm, low-index material
For MgF2, thickness 250nm.
Since 2 surface of the first micro-structure has the second micro-structure 3 and three layers of dielectric stack, bright, bright-coloured face is formd
Color, therefore observer is observed that colored dynamic feature in reflective observing direction 8.Since base material 1 and transparent carrier 10 are
It is bright or translucent, then in the case of viewed in transmittance direction 9, it is observed that the second color 7 of transmission.Due to second micro- knot
The effect of 3 sub-wavelength structure of structure, reflected light and transmitted light color are complementary.This feature is different from the color of traditional printing generation,
This is because the color obtained using mode of printing, either reflective observing or viewed in transmittance, color be it is identical, no
The situation of reflection colour and transmitted colors complementation can be formed.Meanwhile in the optical anti-counterfeit element that is related to of the present embodiment, due to reflection
Light is TE waves, and transmitted light is TM waves, so reflected light and transmitted light all have polarization characteristic, is using polarizing film rotational view
When, there are the variations of light and shade for reflected light and transmitted light.
Fig. 3 shows the appearance of the example optical Security element of the present embodiment.When observing the optical anti-counterfeiting in certain angle
When element, it is able to observe that the top of " A " alphabetical in figure has more bright chromatic colour, as shown in Fig. 3 (a).Work as inclination
When the optical anti-counterfeit element, bright wisp is moved with the increase at angle of inclination to the lower part of alphabetical " A ", until being moved to alphabetical " A "
Bottom, as shown in Fig. 3 (b) to Fig. 3 (d).When tilting the optical anti-counterfeit element repeatedly, then it is able to observe that bright fresh
Gorgeous bright wisp moves up and down in alphabetical " A ", forms color dynamic effect.Under the conditions of viewed in transmittance, as oblique optical is anti-
Pseudo- element is also able to observe that above-mentioned color dynamic effect, and color dynamic under reflective viewing conditions and viewed in transmittance item
Dynamic color under part complementary color each other, and there is polarizability.
During realizing dynamic, if the reflecting surface mirror or balzed grating, of the first micro-structure 2 only have the change of blaze angle
Change along the azimuth of normal not variation, there can be stronger reflected light, forms more dazzling effect.It is designing
In, certain random variation can be increased on the basis of original azimuthal on the basis of keeping original design inclination angle constant,
Even if the reflective type element has variable azimuth, than as shown in figure 4, reflecting surface mirror can be made original azimuthal attached
Closely carry out small-scale swing.In this way, producing a kind of granular sensation in appearance, a kind of effect similar to OVMI is formd.
But since above-mentioned reflecting surface mirror or balzed grating, can directly be carved by electron beam, the methods of laser scribing obtains, it is possible to compared with
Arbitrarily to control various parameters of reflecting surface mirror or balzed grating, such as inclination angle, azimuth, period etc., may be implemented more
Various effect design and it is more flexible, be accurately controlled means.As shown in Fig. 5 (a)-Fig. 5 (d), extremely relative to Fig. 3 (a)
Fig. 3 (d) is formed after a degree of random variation of azimuth increase of reflecting surface mirror or balzed grating, to optical anti-counterfeit element
Similar to the color dynamic effect of OVMI.
Further, the sub-wavelength structure can be identical or different with the orientation of the reflective type element.Such as Fig. 6
Shown, by taking one-dimensional sub-wave length grating 601 and balzed grating, 602 as an example, the orientation of one-dimensional sub-wave length grating 601 can be with sudden strain of a muscle
The direction of credit grating 602 is identical, can also be different from the direction of balzed grating, 602.As it can be seen that balzed grating, 602 from Fig. 6 (a)
Azimuth there is random swing in a certain direction, from macroscopically from it will be observed that similar to photochromatic printing ink (OVI)
Particle feeling.There is no completely along balzed grating, in the direction of one-dimensional sub-wave length grating 601 on balzed grating, 602
602 surface is arranged, but identical as the direction of the optical anti-counterfeiting product.In that case, it still can obtain anti-
Penetrate dynamic effect and transmission dynamic effect, reflection colour and transmitted colors complementary color each other.It is shown as shown in Figure 6 again, one-dimensional sub-wavelength
Grating 601 is identical with the orientation of balzed grating, 602, in that case, the reflection colour of the optical anti-counterfeit element
It is slightly different with transmitted colors and the color in Fig. 6 (a), but still keeps the effect of color dynamic, reflection colour and transmission face
Color is complementary colours.
In addition, described above is sub-wavelength structures at least partially cover on the reflective type element, still with one-dimensional Asia
For wave length grating and balzed grating, i.e., one-dimensional sub-wave length grating 601 can not be the table that all balzed grating,s 602 are completely covered
Face.As shown in Fig. 6 (c), 602 surface of balzed grating, is covered with one-dimensional sub-wave length grating in the region I 603 of optical anti-counterfeit element
601；602 surface of balzed grating, is without one-dimensional sub-wave length grating 601 in region II 604.604 surface region I 603 and region II
It deposited dielectric stack 605.In that case, there are two types of colors for region I 603 and region II 604 tools, can form tool
There are identical two dynamic but different color regions.
In these cases, the parameter of dielectric stack 605 can suitably be adjusted so that region I 603 and region II 604
Color having the same, and will appear color change different situation when oblique optical Security element.For example, region I's is one-dimensional
Sub-wave length grating 601 be one-dimensional sinusoidal grating, eigenperiod 340nm, gash depth 180nm；Dielectric stack thereon
For " TiO2/MgF2/TiO2/MgF2/TiO2", thickness corresponds to 55nm/174nm/52nm/185nm/60nm.Fig. 6 (d) is provided
In this case according to the color coordinates of the region I of the optical anti-counterfeit element of the present embodiment and region II with viewing angle
Situation of change.It can be seen that when the first viewing angle is 0 °, the color coordinates of region I 603 is (- 3.2,67.8), is presented
Yellow；The color coordinates of region II 604 is (2.4,78.1), yellow is also presented, the aberration △ E of the two are 13.2, for people's
Color is identical both for vision.When the second viewing angle is 40 °, the color coordinates of interference structure 10 is (1.9, -47.9),
Blue is presented；The color coordinates of interference structure 20 is (- 24.4,63.9), and green is presented, and the two color has significant difference.
As it can be seen that when the first viewing angle is 0 °, i.e. right-angle view sub-wavelength micro relief profile region I and the two regions flat surfaces II
When, their color is essentially identical；With the increase of viewing angle, the color distinction in two regions becomes larger, and becomes dramatically different
Two kinds of tones.In this way, by appropriately designed in plate-making, the sub-wavelength micro relief profile area for being covered with sub-wave length grating can be made
Domain and otherwise planar surface area form word, the pattern of certain sense, and word, pattern are hidden in background when observation is faced in realization,
The optical anti-counterfeiting effect that word, pattern show when oblique view.
It can be used as label, mark, wide item, transparent window, overlay film etc., Ke Yitong according to the optical anti-counterfeit element of the present embodiment
Various bonding mechanisms are crossed to be adhered on various articles.Such as high safety product and the high added value production such as be transferred to banknote, credit card
On product.
Another embodiment of the present invention additionally provides the product of the optical anti-counterfeit element with above-described embodiment, the product packet
Include but be not limited to all kinds of high safety products such as banknote, credit card, passport, marketable securities and high value added product and all kinds of packets
Fill paper, packing box etc..
Another embodiment of the present invention additionally provides a kind of preparation method of optical anti-counterfeit element, as shown in fig. 7, the preparation side
Method mainly includes the following steps that：
Step S701, provides base material.
Specifically, transparent base or translucent base material can be provided.And the base material preferably comprises first surface and second
Surface, wherein reflective type element is formed on first surface, and first surface, second surface and/or reflective type element can be by scalding
The methods of print, transfer are attached on transparent carrier.
Step S702 forms reflective type element at least one surface of the base material.
Specifically, reflecting surface mirror or balzed grating, can be made to make by the straight carving method of electron beam or laser scribing method
For the reflective type element, and the azimuth for configuring reflecting surface mirror or balzed grating, in the production process has a variation, then by institute
It states reflecting surface mirror or the balzed grating, is formed at least one surface of the base material.
Step S703 covers sub-wavelength structure at least partly on the reflective type element.
Specifically, sub-wave length grating can be made using as the sub-wavelength structure, and make the sub-wave length grating and institute
The orientation for stating reflective type element is identical or different, then the sub-wave length grating is made at least partly to cover the reflection-type member
Part.
Step S704 deposits plating on the sub-wavelength structure and reflective type element not covered with the sub-wavelength structure
Layer.
Specifically, the coating can be high refractive index material layer or by high refractive index material layer and low refractive index material layer
Stack gradually the dielectric stack of composition.
It should be noted that the preparation method of the optical anti-counterfeit element of the present embodiment and the optical anti-counterfeit element of above-described embodiment
Specific implementation details it is same or similar, therefore no longer repeated herein.
The preferred embodiment of the present invention is described in detail above in association with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical scheme of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (14)
1. a kind of optical anti-counterfeit element, which is characterized in that the optical anti-counterfeit element includes：
Base material is configured as transparent base or translucent base material；
The reflective type element being formed at least one surface of the base material；
At least partially cover over the sub-wavelength structure on the reflective type element；And
The coating being deposited on the sub-wavelength structure and reflective type element not covered with the sub-wavelength structure.
2. optical anti-counterfeit element according to claim 1, which is characterized in that the base material includes first surface and the second table
Face, is formed with the reflective type element on the first surface, and the first surface, the second surface and/or described anti-
Emitting element is attached on transparent carrier.
3. optical anti-counterfeit element according to claim 1, which is characterized in that the reflective type element is reflecting surface mirror or sudden strain of a muscle
Credit grating.
4. optical anti-counterfeit element according to claim 1, which is characterized in that the reflective type element has variable orientation
Angle.
5. optical anti-counterfeit element according to claim 1, which is characterized in that the sub-wavelength structure is the micro- embossment of sub-wavelength
Structure, and the sub-wavelength micro relief profile includes sub-wave length grating.
6. optical anti-counterfeit element according to claim 1, which is characterized in that the coating be high refractive index material layer or by
High refractive index material layer and low refractive index material layer stack gradually the dielectric stack of composition.
7. optical anti-counterfeit element according to claim 6, which is characterized in that the dielectric stack has Fabry Perot
Cavity resonator structure.
8. optical anti-counterfeit element according to claim 1, which is characterized in that the sub-wavelength structure and reflection-type member
The orientation of part is identical or different.
9. a kind of product using the optical anti-counterfeit element described in any one of claim 1 to 8.
10. a kind of preparation method of optical anti-counterfeit element, which is characterized in that the preparation method includes：
Base material is provided, and the base material is configured as transparent base or translucent base material；
Reflective type element is formed at least one surface of the base material；
Sub-wavelength structure is covered at least partly on the reflective type element；And
The deposited plating layer on the sub-wavelength structure and reflective type element not covered with the sub-wavelength structure.
11. preparation method according to claim 10, which is characterized in that wherein：
The offer base material includes：Offer includes the transparent base of first surface and second surface or translucent base material；
Also, form the reflective type element on the first surface, and by the first surface, the second surface and/
Or the reflective type element is attached on transparent carrier.
12. preparation method according to claim 10, which is characterized in that formed at least one surface of the base material
Reflective type element includes：
Reflecting surface mirror or balzed grating, are made using as reflection-type member by the straight carving method of electron beam or laser scribing method
Part, and the azimuth for configuring reflecting surface mirror or balzed grating, in the production process has a variation, then by the reflecting surface mirror or institute
Balzed grating, is stated to be formed at least one surface of the base material.
13. preparation method according to claim 10, which is characterized in that it is described on the reflective type element at least partly
Ground covers sub-wavelength structure：
Sub-wave length grating is made using as the sub-wavelength structure, and makes the row of the sub-wave length grating and the reflective type element
Column direction is identical or different, then the sub-wave length grating is made at least partly to cover the reflective type element.
14. preparation method according to claim 10, which is characterized in that the coating is high refractive index material layer or by height
Refractive index material and low refractive index material layer stack gradually the dielectric stack of composition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710192199.6A CN108656782B (en) | 2017-03-28 | 2017-03-28 | Optical anti-counterfeiting element, product using optical anti-counterfeiting element and preparation method of optical anti-counterfeiting element |
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|---|---|---|---|
| CN201710192199.6A CN108656782B (en) | 2017-03-28 | 2017-03-28 | Optical anti-counterfeiting element, product using optical anti-counterfeiting element and preparation method of optical anti-counterfeiting element |
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| CN108656782A true CN108656782A (en) | 2018-10-16 |
| CN108656782B CN108656782B (en) | 2020-07-10 |
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| CN112572015A (en) * | 2019-09-30 | 2021-03-30 | 中钞特种防伪科技有限公司 | Optical anti-counterfeiting element and anti-counterfeiting product |
| WO2021103670A1 (en) * | 2019-11-27 | 2021-06-03 | 中钞特种防伪科技有限公司 | Optical anti-counterfeiting element and optical anti-counterfeiting product |
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| CN114639326A (en) * | 2022-05-20 | 2022-06-17 | 苏州苏大维格科技集团股份有限公司 | Precise microstructure presenting three-dimensional relief image and preparation method and application thereof |
| CN114728534A (en) * | 2020-01-03 | 2022-07-08 | 捷德货币技术有限责任公司 | Optically variable security element |
| CN114891367A (en) * | 2021-01-26 | 2022-08-12 | 中钞特种防伪科技有限公司 | Flaky optical pigment, preparation method thereof and anti-counterfeiting element |
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| CN114639326A (en) * | 2022-05-20 | 2022-06-17 | 苏州苏大维格科技集团股份有限公司 | Precise microstructure presenting three-dimensional relief image and preparation method and application 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 |
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