CN111171600A - Optically variable pigment flake - Google Patents
Optically variable pigment flake Download PDFInfo
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- CN111171600A CN111171600A CN202010010918.XA CN202010010918A CN111171600A CN 111171600 A CN111171600 A CN 111171600A CN 202010010918 A CN202010010918 A CN 202010010918A CN 111171600 A CN111171600 A CN 111171600A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
- C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
- C09C1/0015—Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings
Abstract
The application provides an optically variable pigment flake. The optically variable pigment flake comprises a reflecting core layer, and a first dielectric layer, a first semi-absorption layer, a second dielectric layer and a second semi-absorption layer which are sequentially stacked and arranged on at least one main surface of a reflector layer; wherein the optical thicknesses of the first dielectric layer and the second dielectric layer are set such that the optically variable pigment flakes have at least three colors when an observation angle is varied within a range of 0 to 90 degrees from a normal direction of the major surface of the reflective core layer. The optically variable pigment flake has the optical effect of multi-order color change.
Description
Technical Field
The application relates to the technical field of optically variable pigments, in particular to an optically variable pigment flake.
Background
The optically variable pigment is prepared by depositing multiple layers of film structures with interference effect on a proper substrate by vapor deposition or other methods in a certain order, and when the observation angle changes, the optical path difference changes, so that the light with different wavelengths at different angles is subjected to constructive interference, and the color variation along with the angle is realized.
The optically variable pigment can be used for preparing optically variable ink, and the optically variable ink cannot be imitated by common counterfeiting means due to the unique color change phenomenon and the large preparation cost, and is applied to currency, securities, invoices and other situations needing anti-counterfeiting. With the development of economy, optically variable pigments have been expanded to be applied to the decoration industry, such as cosmetic pigments, automobile coating pigments, high-end toy pigments, and the like.
With the wider application, the requirements on the color change performance of the optically variable pigment are higher and higher.
Disclosure of Invention
The application provides an optically variable pigment flake, which can have the optical effect of multi-order color change.
In order to solve the technical problem, the application adopts a technical scheme that: providing an optically variable pigment flake, which comprises a reflecting core layer, and a first dielectric layer, a first semi-absorption layer, a second dielectric layer and a second semi-absorption layer which are sequentially stacked and arranged on at least one main surface of a reflector layer; wherein the optical thicknesses of the first dielectric layer and the second dielectric layer are set such that the optically variable pigment flakes have at least three colors when an observation angle is varied within a range of 0 to 90 degrees from a normal direction of the major surface of the reflective core layer.
The beneficial effect of this application is: in contrast to the related art, the present application provides an optically variable pigment flake including a reflective core layer and a first dielectric layer, a first semi-absorbing layer, a second dielectric layer and a second semi-absorbing layer sequentially stacked on at least one major surface of the reflective layer, the reflective layer and the first dielectric layer and the first semi-absorbing layer disposed on at least one major surface thereof substantially determining the dominant color and the final discoloration of the optically variable pigment flake, on the basis of which the second dielectric layer and the second semi-absorbing layer are capable of selectively absorbing and filtering reflection peaks of a specific wavelength band, thereby narrowing the half-peak width of the reflection peak of the specific wavelength when an observation angle is changed, wherein the optical thicknesses of the first dielectric layer and the second dielectric layer are set such that when the observation angle is changed within a range of 0 to 90 degrees from a normal direction of the major surface of the reflective core layer, the optically variable pigment flakes have at least three colors, namely, the optically variable pigment flakes have a multi-step color change optical effect, and the color change is obvious in color change and discrete in change.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
fig. 1 is a schematic view of a first structure of an embodiment of optically variable pigment flakes according to the present application;
fig. 2 is a schematic diagram of a second structure of an embodiment of optically variable pigment flakes according to the present application;
fig. 3 is a schematic diagram of a third structure of an embodiment of optically variable pigment flakes according to the present application;
fig. 4 is a schematic structural view of another embodiment of optically variable pigment flakes according to the present application;
fig. 5 is a spectral representation of reflectance versus wavelength for an embodiment of optically variable pigment flakes according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that if directional indications (such as up, down, left, right, front, and back … …) are referred to in the embodiments of the present application, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic view of a first structure of an embodiment of an optically variable pigment flake according to the present application.
The present embodiment provides an optically variable pigment flake 100, wherein the optically variable pigment flake 100 comprises a reflective core layer, and a first dielectric layer 120, a first semi-absorbing layer 130, a second dielectric layer 140 and a second semi-absorbing layer 150 sequentially stacked on at least one major surface of the reflective core layer.
The materials of the first dielectric layer 120 and the second dielectric layer 140 are dielectric materials.
Wherein the optical thicknesses of the first dielectric layer 120 and the second dielectric layer 140 are set such that the optically variable pigment flakes 100 have at least three colors when the viewing angle is varied within a range of 0-90 degrees from a normal direction of the major surface of the reflective core layer 110.
In the present embodiment, a front view is defined as an observation angle that is deviated by 0 degrees from the normal direction of the main surface of the reflective core layer 110, and a side view is defined as an observation angle that is deviated by more than 0 degrees and 90 degrees or less from the normal direction of the main surface of the reflective core layer 110.
The reflector layer and the first dielectric layer 120 and the first semi-absorbing layer 130 disposed on at least one of its major surfaces substantially determine the dominant color (i.e., the color in front view) and the resulting discoloration (i.e., the color at which the viewing angle is 90 degrees or nearly 90 degrees off from the normal to the major surface of the reflective core layer 110) of the optically variable pigment flake 100.
On the basis, the second dielectric layer 140 and the second semi-absorption layer 150 can form an additional interference cavity to selectively absorb and filter the reflection peak of a specific wavelength band, so that the half-peak width of the reflection peak of a specific wavelength is narrowed when the observation angle is changed, and thus, when the observation angle is changed, different colors which can be observed have obvious color boundaries, and the colors are discretely changed.
The color of the optically variable pigment flakes 100 exhibits discrete variations due to: the selective absorption of the second semi-absorption layer 150 and the second medium layer 140 back and forth twice plays a role of filtering and filtering stray light near the highest reflection wavelength light, so that when interference occurs, the light wave with a specific wavelength obtains constructive interference, and the light with the wavelength near the specific waveband and other wavebands are greatly inhibited due to the filtering, so that when the observation angle is changed, the half-peak width of the reflection spectrum with the specific wavelength is narrowed, and the color is represented as discrete change.
The optically variable pigment flakes 100 have at least three colors, which may be, for example: the optically variable pigment flakes 100 have a first color when the viewing angle is at or near 0 degrees (e.g., 0-5 degrees) from normal to the major surfaces of the reflector layer; the optically variable pigment flakes 100 have a second color when the viewing angle deviates from greater than 0 degrees (or greater than 5 degrees) and 45 degrees or less in a normal direction with respect to the major surface of the reflector layer; the optically variable pigment flakes 100 have a third color when the viewing angle deviates from a normal direction to the major surface of the reflector layer by more than 45 degrees and 90 degrees or less; there are distinct color boundaries between the three colors.
By making the optically variable pigment flakes 100 have at least three colors, i.e., have a multi-order color-changing optical effect, the anti-counterfeiting performance can be improved when the optically variable pigment flakes 100 are used in the anti-counterfeiting field; or to meet special decorative requirements and provide different decorative effects when the optically variable pigment flakes 100 are used in the field of decoration. Of course, the optically variable pigment flakes 100 of the present embodiment can also be applied to other different fields due to the multi-step color changing optical effect, which is not illustrated here.
An embodiment of the optically variable pigment flake 100 provided herein comprises a reflective core layer 110, and a first dielectric layer 120, a first semi-absorbing layer 130, a second dielectric layer 140, and a second semi-absorbing layer 150 sequentially stacked on at least one major surface of the reflective layer, wherein the reflective layer and the first dielectric layer 120 and the first semi-absorbing layer 130 disposed on at least one major surface thereof substantially determine the dominant color and the final color change of the optically variable pigment flake 100, and further wherein the second dielectric layer 140 and the second semi-absorbing layer 150 are capable of selectively absorbing and filtering the reflection peaks of a specific wavelength band, such that the half-peak width of the reflection peaks of the specific wavelength is narrowed when the viewing angle is changed, wherein the optical thicknesses of the first dielectric layer 120 and the second dielectric layer 140 are set such that when the viewing angle is changed within a range of 0 to 90 degrees from the normal direction of the major surface of the reflective core layer 110, the optically variable pigment flakes 100 have at least three colors, i.e., have a multi-step color-changing optical effect, and also exhibit a distinct and discrete change in color.
Optionally, the optical thicknesses of the first dielectric layer 120 and the second dielectric layer 140 are set such that the optically variable pigment flakes 100 have a color at viewing angles that deviate from 0 degrees from normal to the major surfaces of the reflector layer that has lower brightness and saturation than the color at other viewing angles.
By properly adjusting the thicknesses of the first dielectric layer 120 and the second dielectric layer 140, the reflection peak and the half-peak width when viewed at a front view angle, i.e., a 0-degree angle, are relatively lower and wider than those when viewed from a side view angle. The color is represented by that the brightness and saturation of the positive color (color in the normal view) are lower than those of the lateral color.
This effect occurs for two reasons: firstly, the color is a composite color in the normal vision, namely, at least two peaks are arranged in the visible light wave band (380nm-700nm), and the composite color of the two peaks forms the normal vision color, so the color saturation is not high. In the side view, the reflection peak is blue-shifted to the ultraviolet band due to the change of the optical path difference, and only one main reflection peak is left in the visible band, so that the color saturation of the side color is very high; secondly, because the optical path difference between the front view and the side view is slightly different, the optical path difference between the front view and the side view is smaller than that between the side view, and because the interference effect of the dielectric film is periodic, the optical thickness of the first dielectric layer 120 and the second dielectric layer 140 is set so that the optical variable pigment sheet 100, for example, the optical path difference corresponding to the side view (e.g., 15 degrees, 20 degrees, 25 degrees or 30 degrees) is an integer multiple of the design wavelength, so that the constructive interference of the design wavelength is at the strongest point, and then at the front view or near the design wavelength, the constructive interference is relatively weak. The design wavelength may be a specific wavelength at which constructive interference is desired at a certain angle.
Therefore, by adjusting the optical thicknesses of the first dielectric layer 120 and the second dielectric layer 140, the constructive interference is strongest at a certain angle of side view, and the brightness and saturation of the observed color at the angle are also strongest. And the color performance such as brightness and saturation shows a certain regular weakening at other observation angles.
Optionally, the optical thickness of the first dielectric layer 120 and the second dielectric layer 140 is 400nm-700nm and is (2n +0.1,2n +0.5) QWOT/4, where n is an integer.
QWOT denotes the wavelength at which the optical thickness of the dielectric layer is equal to a quarter wavelength in front view. QWOT/4 is one quarter of QWOT. That is, when the optical thicknesses of first dielectric layer 120 and second dielectric layer 140 are integer multiples of QWOT/4, constructive interference is strongest at front view. In the present embodiment, the optical thicknesses of the first dielectric layer 120 and the second dielectric layer 140 are (2n +0.1,2n +0.5) QWOT/4, that is, the optical thicknesses of the first dielectric layer 120 and the second dielectric layer 140 are slightly thicker than the optical thickness required for the strongest constructive interference, but not more than 1 integer QWOT/4, so that the constructive interference is strongest at a certain angle in side view.
The optical thicknesses of first dielectric layer 120 and second dielectric layer 140 may be, for example: (2n +0.1) QWOT/4, (2n +0.2) QWOT/4, (2n +0.3) QWOT/4, (2n +0.4) QWOT/4, or (2n +0.5) QWOT/4, and is in the range of 400nm-700 nm.
Optionally, the material of first dielectric layer 120 may be selected from at least one of silicon dioxide, magnesium fluoride and cryolite. That is, first dielectric layer 120 may be composed of one material or a mixture of at least two of the above materials.
Optionally, the material of the second dielectric layer 140 may be at least one selected from silicon dioxide, magnesium fluoride and cryolite. That is, the second dielectric layer 140 may be composed of one material or a mixture of at least two materials.
The same material may be used for first dielectric layer 120 and second dielectric layer 140.
The optical thicknesses of first dielectric layer 120 and second dielectric layer 140 may be the same.
Optionally, the refractive index of each of first dielectric layer 120 and second dielectric layer 140 is less than 2.
Experimental research shows that when the first dielectric layer 120 and the second dielectric layer 140 are made of materials with lower refractive indexes, the color of the optically variable pigment flakes 100 changes faster with the change of the observation angle, the color changes more obviously, the color is more vivid, and better color performance can be obtained. Preferably, the refractive index of each of the first dielectric layer 120 and the second dielectric layer 140 is less than 1.6.
In addition, when the optical variable pigment flake 100 is manufactured by the physical vapor deposition method, the evaporation states of the first dielectric layer 120 and the second dielectric layer 140 should be kept as stable as possible.
Optionally, the material of the first semi-absorbent layer 130 is selected from: at least one of chromium, nickel, titanium, copper, silicon, germanium, vanadium, and tungsten, or an alloy of at least two thereof. That is, the first semi-absorption layer 130 may be composed of the above-mentioned simple substance material, or an alloy material composed of the above-mentioned simple substance material.
The physical thickness of the first semi-absorbing layer 130 ranges from 3nm to 20 nm. For example 3nm, 5nm, 8nm, 10nm, 12nm, 15nm, 18nm or 20 nm.
Optionally, the material of the second semi-absorbent layer 150 is selected from: at least one of chromium, nickel, titanium, copper, silicon, germanium, vanadium, and tungsten, or an alloy of at least two thereof. That is, the first semi-absorption layer 130 may be composed of the above-mentioned simple substance material, or an alloy material composed of the above-mentioned simple substance material.
The physical thickness of the second semi-absorbing layer 150 ranges from 3nm to 20 nm. For example 3nm, 5nm, 8nm, 10nm, 12nm, 15nm, 18nm or 20 nm.
Optionally, the materials selected for the first and second semi-absorbent layers 130 and 150 are the same.
Optionally, the first and second semi-absorbing layers 130 and 150 have the same optical or physical thickness.
Referring to fig. 2, fig. 2 is a schematic diagram of a second structure of an embodiment of an optically variable pigment flake according to the present application.
Alternatively, the first dielectric layer 120, the first semi-absorption layer 130, the second dielectric layer 140, and the second semi-absorption layer 150 are symmetrically disposed on both sides of the reflective core layer 110 opposite to each other.
Both sides of the reflective core layer 110 opposite to each other include a first dielectric layer 120, a first semi-absorbing layer 130, a second dielectric layer 140, and a second semi-absorbing layer 150, which are sequentially stacked on at least one major surface of the reflector layer, and have a symmetrical structure.
By designing the optically variable pigment flakes 100 to have a symmetrical structure, light rays incident from both sides of the optically variable pigment flakes 100 can have equivalent optical path difference, and a more stable and reliable interference effect is obtained, thereby ensuring optically variable performance.
Referring to fig. 3, fig. 3 is a schematic diagram of a third structure of an embodiment of an optically variable pigment flake according to the present application.
Alternatively, the reflective core layer 110 includes two reflective layers 112, 113 and a magnetic layer 111.
The opposite sides of the magnetic layer 111 are symmetrically provided with reflective layers 112, 113, and a first dielectric layer 120, a first semi-absorbing layer 130, a second dielectric layer 140 and a second semi-absorbing layer 150 are provided on the major surface of at least one of the reflective layers 112, 113 facing away from the magnetic layer 111.
As shown in FIG. 3, in this embodiment, the first dielectric layer 120, the first semi-absorbent layer 130, the second dielectric layer 140 and the second semi-absorbent layer 150 are disposed on the major surfaces of the reflective layers 112 and 113 facing away from the magnetic layer 111. The optically variable pigment flakes 100 are symmetrical structures.
In other embodiments, only one of the reflective layers 112, 113 may have its major surface facing away from the magnetic layer 111 provided with a first dielectric layer 120, a first semi-absorbent layer 130, a second dielectric layer 140, and a second semi-absorbent layer 150.
Optionally, the two reflective layers 112, 113 are made of the same reflective material, and the materials of the reflective layers 112, 113 may be selected from: at least one of aluminum, silver, gold, platinum, and indium. That is, the reflective layers 112 and 113 may be composed of the above-described simple substance material.
The physical thickness of the reflective layers 112, 113 may be 5nm to 50 nm. For example 5nm, 10nm, 12nm, 17nm, 20nm, 22nm, 28nm, 30nm, 35nm, 40nm, 46nm or 50 nm.
The material of the magnetic layer 111 may be selected from: at least one of iron, cobalt, nickel or an oxidation thereof, or selected from: an alloy of at least two of iron, cobalt, nickel, manganese, carbon. That is, the magnetic layer 111 may be composed of the above-described elemental material, or may be composed of at least one oxide of the composition of the above-described elemental material, such as nickel oxide, cobalt oxide, or the like; or an alloy material composed of the above simple substance materials.
The material of the magnetic layer 111 may also be selected from: at least one of an iron/silicon alloy, an iron/nickel alloy, an iron/cobalt alloy, and an iron/nickel/molybdenum alloy. That is, the magnetic layer 111 may be composed of one alloy material or a mixture of at least two alloy materials.
The material of the magnetic layer 111 may also be selected from: at least one of SmCo5, NdCo5, Sm2Co17, Nd2Fe14B, and TbFe 2. That is, the magnetic layer 111 may be composed of one material or a mixture of at least two materials.
The material of the magnetic layer 111 may also be selected from: at least one of Fe3O4, NiFe2O4, MnFe2O4, CoFe2O4, YIG and GdIG. That is, the magnetic layer 111 may be composed of one material or a mixture of at least two materials.
In this embodiment, the physical thickness of the first magnetic layer 111120 and the second magnetic layer 111150 is 5nm to 100nm, such as 5nm, 10nm, 20nm, 40nm, 50nm, 60nm, 70nm, 40nm, 80nm, 90nm, or 100 nm.
In the fields with different requirements on magnetism, the strength of magnetism can be regulated and controlled on the premise of ensuring high reflectivity. In the physical vapor deposition process, the magnetic film is formed by recombining the decomposed magnetic target material into a film, so that the structural parameters such as crystal form, three-dimensional size and the like are changed. The control of the magnetic strength is a difficult problem in the industry, and in the practical production, the magnetic strength can be controlled by controlling the thickness of the magnetic layer 111, for example, the Br and Hc values can be controlled to be 0 to any reasonable value (Bm is the maximum magnetic induction strength; Hm is the maximum magnetic field strength; Br is the remanence; and Hc is the coercive force).
Further, in selecting the magnetic material, a combination having particularly strong magnetism can be selected in combination with the cost and the magnetic requirement. Because the strength and thickness of magnetism have a certain correlation, under the condition of achieving the same magnetism, the material with stronger magnetism needs thinner thickness, and in the coating process, the thicker the thickness of the film layer, the higher the production cost. According to the application requirements, the combination of materials with stronger magnetism is selected to achieve the effect of controlling the production cost.
The optically variable pigment flakes 100 are made to have magnetic properties by including the magnetic layer 111 in the reflective core layer 110. On one hand, the anti-counterfeiting capability of the pigment can be improved, for example, the pigment has an optical variable effect and also has an implicit magnetic effect, related information can be recorded by utilizing magnetism, and the characteristic can be found only by detecting with a specific instrument, so that the pigment has the characteristic of integrating the characteristics of first-line anti-counterfeiting and second-line anti-counterfeiting; on the other hand, when the optically variable pigment flakes 100 are used for decoration, the optically variable pigment flakes 100 can be oriented by an external magnetic field due to their magnetic properties, so that the optically variable pigment flakes 100 can be aligned, thereby enriching the applications of the optically variable pigment flakes 100, such as the realization of 3D images, the generation of specific magnetic induction images or patterns, and the like.
In addition, the structure that the two reflecting layers 112 and 113 sandwich the magnetic layer 111 is designed, so that the optically variable pigment flakes 100 have higher reflectivity.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of the optically variable pigment flake of the present application.
The present embodiment is different from the embodiment of the optically variable pigment flake 100 described above in that the reflective core layer 110 is a magnetic reflective layer 110, and the magnetic reflective layer 110 includes at least one magnetic metal.
Alternatively, the magnetic reflective layer 110 is composed of a magnetic material having a coercivity greater than 1000 and a remanence greater than 20.
Optionally, the magnetic material comprises at least one alloy of iron, chromium, nickel and manganese constituents. That is, the magnetic material of the magnetic reflective layer 110 may be at least one alloy, wherein the alloy includes iron, chromium, nickel, and manganese components.
The magnetic material comprises the following components in percentage by weight: 50-60% of iron, 10-30% of chromium, 5-20% of nickel and 0.5-2% of manganese.
The reflective core layer 110 of the optically variable pigment flakes 100 in this embodiment is a magnetic reflective layer 110, so that the optically variable pigment flakes 100 have magnetic properties. And the magnetic reflection layer 110 replaces the magnetic layer 111 and the reflection layers 112 and 113, so that the magnetic strength is high, the binding force between the magnetic layer 111 and the reflection layers 112 and 113 is improved, the layering phenomenon is reduced, meanwhile, the structure of the optically variable pigment sheet 100 is simple, the production cost is reduced, and the color rendering saturation of the optically variable pigment sheet 100 is improved.
Alternatively, the physical thickness of the magnetic reflective layer 110 ranges from 5nm to 500 nm. For example, the physical thickness of the magnetic reflective layer 110 can be 5nm, 6nm, 15nm, 30nm, 100nm, 250nm, 499nm, or 500nm, etc.
Referring to fig. 5, fig. 5 is a spectrum diagram of reflectance versus wavelength for an embodiment of optically variable pigment flakes according to the present application.
The optically variable pigment flake 100 has an 11-layer structure, and the reflective core layer 110 includes two reflective layers 112 and 113 and a magnetic layer 111; the two opposite sides of the magnetic layer 111 are symmetrically provided with reflective layers 112 and 113, and a first dielectric layer 120, a first semi-absorption layer 130, a second dielectric layer 140 and a second semi-absorption layer 150 are sequentially stacked on the main surface of one side of each reflective layer 112 and 113, which faces away from the magnetic layer 111.
The magnetic layer 111 is made of iron, cobalt and nickel alloy, and the physical thickness is 15 nm. The two reflective layers 112, 113 are made of aluminum and have a physical thickness of 10 nm. The first dielectric layer 120 and the second dielectric layer 140 are made of silicon dioxide and have a physical thickness of 492 nm. The first and second semi-absorbing layers 130 and 150 are made of chromium and have the same thickness, and the physical thickness is 5 nm.
The resulting reflectance spectrum is shown in FIG. 5. Where the ordinate is reflectance and the abscissa is wavelength, the solid line represents the spectral curve of the optically variable pigment flake 100 at a viewing angle of 0 degree, and the different dotted lines represent the spectral curves of the optically variable pigment flake 100 at viewing angles of 30 degrees and 60 degrees, respectively.
As can be seen, the optically variable pigment flakes 100 of this embodiment achieve at least three observable colors, i.e., multiple color changes, during the angular change.
In contrast to the related art, the present application provides an optically variable pigment flake including a reflective core layer and a first dielectric layer, a first semi-absorbing layer, a second dielectric layer and a second semi-absorbing layer sequentially stacked on at least one major surface of the reflective layer, the reflective layer and the first dielectric layer and the first semi-absorbing layer disposed on at least one major surface thereof substantially determining the dominant color and the final discoloration of the optically variable pigment flake, on the basis of which the second dielectric layer and the second semi-absorbing layer are capable of selectively absorbing and filtering reflection peaks of a specific wavelength band, thereby narrowing the half-peak width of the reflection peak of the specific wavelength when an observation angle is changed, wherein the optical thicknesses of the first dielectric layer and the second dielectric layer are set such that when the observation angle is changed within a range of 0 to 90 degrees from a normal direction of the major surface of the reflective core layer, the optically variable pigment flakes have at least three colors, namely, the optically variable pigment flakes have a multi-step color change optical effect, and the color change is obvious in color change and discrete in change.
The above embodiments are merely examples and are not intended to limit the scope of the present disclosure, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present disclosure, which are directly or indirectly applied to other related technical fields, are included in the scope of the present disclosure.
Claims (11)
1. An optically variable pigment flake, comprising a reflective core layer, and a first dielectric layer, a first semi-absorbing layer, a second dielectric layer and a second semi-absorbing layer sequentially stacked on at least one major surface of the reflective layer;
wherein the optical thicknesses of the first and second dielectric layers are set such that the optically variable pigment flakes have at least three colors when an observation angle is varied within a range of 0-90 degrees from a normal direction of the major surface of the reflective core layer.
2. The optically variable pigment flake of claim 1, wherein the first dielectric layer, the first semi-absorbing layer, the second dielectric layer and the second semi-absorbing layer are symmetrically disposed on opposite sides of the reflective core layer.
3. The optically variable pigment flake of claim 1, wherein the reflective core layer comprises two reflective layers and a magnetic layer;
the two opposite sides of the magnetic layers are symmetrically provided with the reflecting layers, and the main surface of one side of at least one reflecting layer, which is far away from the magnetic layers, is provided with the first dielectric layer, the first semi-absorption layer, the second dielectric layer and the second semi-absorption layer.
4. The optically variable pigment flake of claim 3, wherein the reflective layer comprises a material selected from the group consisting of: at least one of aluminum, silver, gold, platinum, or indium;
the physical thickness of the reflecting layer is 5nm-50 nm.
5. The optically variable pigment flake of claim 3, wherein the magnetic layer comprises a material selected from the group consisting of: one or oxide of iron, cobalt and nickel, or selected from: an alloy of at least two of iron, cobalt, nickel, manganese, carbon;
the physical thickness of the magnetic layer is 5nm-100 nm.
6. The optically variable pigment flake of claim 1, wherein the reflective core layer is a magnetic reflective layer comprising at least one magnetic metal.
7. The optically variable pigment flake of claim 1, wherein the first semi-absorbing layer comprises a material selected from the group consisting of: at least one of chromium, nickel, titanium, copper, silicon, germanium, vanadium, and tungsten, or an alloy of at least two thereof.
The physical thickness of the first semi-absorption layer ranges from 3nm to 20 nm.
8. The optically variable pigment flake of claim 1, wherein the second semi-absorbing layer comprises a material selected from the group consisting of: at least one of chromium, nickel, titanium, copper, silicon, germanium, vanadium, and tungsten, or an alloy of at least two thereof;
the physical thickness of the second semi-absorption layer ranges from 3nm to 20 nm.
9. The optically variable pigment flake of claim 1, wherein the first dielectric layer and the second dielectric layer each have a refractive index of less than 2.
10. The optically variable pigment flake of claim 1, wherein the first and second dielectric layers have optical thicknesses such that the optically variable pigment flake exhibits a color at viewing angles offset from 0 degrees from normal to the major surface of the reflector layer that exhibits lower brightness and saturation than the color at other viewing angles.
11. The optically variable pigment flake of claim 10, wherein the first dielectric layer and the second dielectric layer have an optical thickness of 400nm to 700nm and (2n +0.1,2n +0.5) QWOT/4, wherein n is an integer.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111574860A (en) * | 2020-06-17 | 2020-08-25 | 惠州市华阳光学技术有限公司 | Metallic pigment flakes and metallic inks |
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