CN111812761A - Multilayer light filtering pigment - Google Patents
Multilayer light filtering pigment Download PDFInfo
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- CN111812761A CN111812761A CN202010542906.1A CN202010542906A CN111812761A CN 111812761 A CN111812761 A CN 111812761A CN 202010542906 A CN202010542906 A CN 202010542906A CN 111812761 A CN111812761 A CN 111812761A
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- G02B5/00—Optical elements other than lenses
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- G02B5/28—Interference filters
- G02B5/285—Interference filters comprising deposited thin solid films
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Abstract
The invention provides a multilayer light filtering pigment which is a flaky multilayer structure comprising the following components in parts by weight: semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer. The invention constructs a difference secondary filtering structure on the basis of the original single filtering structure, thereby obtaining more products differentiated from the existing products; the primary filtering forms a main tone, the difference secondary filtering colors the main tone, and filters the unnecessary stray light again; by the structure, more and more accurate color filtering materials can be obtained.
Description
Technical Field
The invention relates to the technical field of light filtering pigments, in particular to a light filtering pigment sheet which is used for continuously changing color in a visible spectrum of products such as printing ink, paint and the like.
Background
Interference filters are known materials, and multilayer interference effect materials produced by the merck and basf processes by the liquid phase method are known as pearlescent pigments because of their surface having a layer of interference color resembling pearl luster.
The folex products company, in patent CN100475915C full dielectric optical variable pigments, discloses that a multilayer dichroic color-changing pigment is deposited on a flexible substrate in a gas phase manner, and the color-changing effect, color saturation and color sharpness of the multilayer dichroic color-changing pigment are more excellent than those of interference materials produced by a liquid phase method, but the product does not achieve the most excellent state effect because a 5-layer structure is adopted in the actual preparation process, and the folex products company continues to use integer multiples of QWPT as the structure basis.
Disclosure of Invention
In view of the background, it is desirable to provide a filter pigment with improved color shifting, color saturation and color sharpness.
The purpose of the invention is realized by the following technical scheme:
a multilayer light filtering pigment which is a platelet-shaped multilayer structure of:
semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.
The principle of the invention is as follows: the differential secondary filtering method is to construct a secondary filtering system on the basis of 5 layers of filtering, namely primary filtering, which is described in the background art, and the filtering wave bands of the secondary filtering system and the primary filtering have corresponding differences. The 5-layer light filtering structure in the background art is as follows: the white light can be selected differently according to the thickness of the medium layer after the incident light passes through the normal filter cavity, and the white light is filtered into reflection curve product color separations with different colors; the differential secondary filtering system constructed by the invention performs differential secondary filtering on the basis of the original primary filtering. The first dielectric layer and the second dielectric layer select different reference center wavelengths, and the corresponding optical thickness and physical thickness are different; thereby obtaining a more specific reflection curve integration color. The optical thickness is expressed as: the first dielectric layer and the second dielectric layer select the same reference center wavelength, and the corresponding optical thickness and physical thickness are different at different N (multiple) values, thereby obtaining more special reflection integral color separation.
Preferably, the first dielectric layer may be magnesium fluoride (MgF)2) Silicon dioxide (SiO)2) Cryolite (Na)2AlF6) And the like. The free fluoride ion is forbidden under the regulation of a plurality of sanitary safety of European Union, and if the free fluoride ion is forbidden, the magnesium fluoride material can be abandoned, and other materials do not have negative influence on human bodies and environment. These types of materials may also be selected for the second dielectric layer, and the first dielectric layer and the second dielectric layer may be selected from the same or different materials.
Preferably, the thicknesses of the first dielectric layer and the second dielectric layer can use optical thickness QWOT, and the value of the correspondingly selected reference wavelength lambda 0 is 300-800 nm; the physical thickness is selected to be 100-5000 nm.
Preferably, the reflective layer is made of aluminum material or aluminum alloy material, and the final reflectivity of the filter material is higher and the color single color saturation is higher due to the effect of the aluminum material or aluminum alloy material as the reflective layer.
Preferably, the semi-reflecting layer material can be selected from a titanium material or a chromium material.
Preferably, the physical thickness and the optical thickness of the first dielectric layer and the second dielectric layer are close to but different from each other, namely, the near-peak difference filtering is performed; or the optical thicknesses of the first dielectric layer and the second dielectric layer are in multiple difference, namely optical multiple difference filtering; or on the basis that the optical thicknesses of the first dielectric layer and the second dielectric layer are different in multiple, the physical thicknesses of the first dielectric layer and the second dielectric layer are close but different, so that the peak values of the reflectivity curves of the first dielectric layer and the second dielectric layer are close but not coincident, namely the combination of two schemes of near-peak difference filtering and optical multiple difference filtering.
Specifically, the physical thicknesses of the first dielectric layer and the second dielectric layer are close to each other, which means that: the difference between the physical thicknesses of the first dielectric layer and the second dielectric layer is greater than or equal to 5 angstroms and less than or equal to 150 angstroms, namely: the physical thickness of the first dielectric layer-the physical thickness of the second dielectric layer is more than or equal to 150 angstroms and more than or equal to 5 angstroms.
Near peak difference filtering: the first dielectric layer and the second dielectric layer are relatively close to each other in terms of physical thickness or optical thickness, for example, the first dielectric layer is 2000 angstroms, the second dielectric layer is 2005 angstroms or the first dielectric layer is 2005 angstroms, and the second dielectric layer is 2000 angstroms, so that monochromaticity upgrading and fine adjustment of color hue are performed on the basis of filtering, integrating and color separation of a single normal wave cavity.
Optical power difference filtering: the optical thickness of the first dielectric layer and the second dielectric layer is selected by multiple difference, such as 2QWOT for the first dielectric layer and 4QWOT for the second dielectric layer, or 4QWOT for the first dielectric layer and 2QWOT for the second dielectric layer.
The combination of the two schemes of near-peak difference filtering and optical multiple difference filtering can obtain the filtering material with special color shade by using not only the optical multiple difference filtering but also the near-peak difference filtering in practical implementation.
In addition: the design of the multiple difference filtering pigment can also be realized by adding a magnetic layer, namely, an inducible reflecting conducting layer is added on the basis of the difference secondary filtering, and the design is upgraded to the design of the inducible multiple difference filtering pigment: semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/reflective layer/inducible reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.
Compared with the prior art, the invention has the following advantages:
constructing a difference secondary filtering structure on the basis of the original single filtering structure, thereby obtaining more products differentiated from the existing products; the primary filtering forms a main tone, the difference secondary filtering colors the main tone, and filters the unnecessary stray light again; by the structure, more and more accurate color filtering materials can be obtained.
In addition, three times of differential filtering or multiple times of differential filtering can be constructed in the same way, and a product with higher color precision is obtained;
the requirement of optical anti-counterfeiting is the comprehensive embodiment of product technology and product design, and the color required by background design can be better simulated by the scheme of differential secondary filtering, so that the consistency of the product color and the background design is more fit, for example, an integral color consistent with the dominant hue of the background is designed, and from the anti-counterfeiting angle, the color at an angle of 0 degree is consistent with the background color, so that the anti-counterfeiting product is not reproducible.
Drawings
FIG. 1 is a graph of the reflectance integrated color curve of a single-pass 5-layer structured filter pigment according to one embodiment of the present invention;
FIG. 2 is a reflection-integral color curve of a multilayer filter pigment with a differential secondary filter layer added on the basis of a single filtering in one embodiment of the present invention;
FIG. 3 is a chromaticity coordinate position of a single-pass filter 5-layer structure of filter pigments according to one embodiment of the present invention;
FIG. 4 is a chromaticity coordinate of a multilayer filter pigment with a differential secondary filter layer added on the basis of a single filtering in accordance with one embodiment of the present invention;
FIG. 5 is a plot of the integrated color of the single-pass 5-layer structure of filter pigments according to example two of the present invention;
fig. 6 is a reflection-integral color curve of a multilayer filter pigment with a differential secondary filter layer added on the basis of a single filtering in the second embodiment of the invention.
FIG. 7 is a chromaticity diagram coordinate location of a single filtered 5-layer structure filter pigment of a second example of the present invention;
fig. 8 is a chromaticity diagram coordinate position of the multilayer filter pigment after adding a differential secondary filter layer on the basis of the single filtering in the second embodiment of the invention.
Detailed Description
Example one (near peak difference filter mode):
this example provides a multilayer optical filter pigment having the structure:
semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.
Reference wavelength selection λ0The thickness is monitored by optical thickness QWOT, and the multilayer material and thickness of the multilayer filter pigment are as follows:
1. the semi-reflecting layer is made of titanium material, and the physical thickness is 8 nm;
2. the second dielectric layer is made of silicon dioxide, and the optical thickness is 2.35 QWOT;
3. the semi-reflecting layer is made of titanium material, and the physical thickness is 8 nm;
4. the first dielectric layer is made of silicon dioxide, and the optical thickness is 2.4 QWOT;
5. the reflecting layer is made of aluminum alloy material, and the physical thickness is 80 nm;
6. the first dielectric layer is made of silicon dioxide, and the optical thickness is 2.4 QWOT;
7. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
8. the second dielectric layer is silicon dioxide, and the optical thickness is 2.35 QWOT.
9. The semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
the physical thickness of the 2.4QWOT was 2056 angstroms and the physical thickness of the 2.35QWOT was 2013 angstroms.
In the case of only a single filtering of the structures 3, 4, 5, 6, 7, the reflection integral color curves are as shown in fig. 1, and the reflection integral color curves after adding the differential secondary filter layer are completely different as shown in fig. 2.
As can be seen from a comparison of fig. 1 and fig. 2, the integral curve of the differential secondary filtering is represented in the data as:
| 400nm | 425nm | 450nm | 475nm | 500nm | 550nm | 600nm | 650nm | |
| secondary filtering | 50％ | 70％ | 90％ | 70％ | 35％ | 15％ | 13％ | 12％ |
| Differential secondary filtering | 30％ | 60％ | 90％ | 40％ | 15％ | 15％ | 2％ | 25％ |
As can be seen from a comparison of fig. 3 and 4, the differential secondary filtering adjusts the hue position in the chromaticity diagram:
| x seatSign board | Y coordinate | Brightness of light | |
| Single pass filtering | 0.481 | 0.44 | 60.57 |
| Differential secondary filtering | 0.502 | 0.388 | 44.7 |
The data of the two tables are obtained, the differential secondary filtering is relatively non-differential secondary filtering, the half-wave width of the reflectivity curve can be effectively reduced, adjustment can be carried out on each color segment, and the adjustment amplitude depends on the central wavelength of the reference filtering used in the design of the secondary filtering; the design scheme can be used for greatly mixing colors, the color gamut cannot be spanned during the large-scale color mixing, and meanwhile, the integral colors can be finely adjusted.
The concrete performance of the design on the product is as follows: the differential secondary filtering is relatively non-differential secondary filtering, and the differential secondary filtering can modify the integral color curve of the single filtering in multiple directions according to design parameters, so that integral colors which are closer to the design target can be prepared; for example, an integral color consistent with the background main tone is designed, and from the anti-counterfeiting perspective, the color at an angle of 0 degree is consistent with the background color, so that the anti-counterfeiting color is not reproducible.
Example two (optical power difference filtering):
this example provides a multilayer optical filter pigment having the structure:
semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.
Reference wavelength selection λ0The thickness is monitored by optical thickness QWOT, and the multilayer material and thickness of the multilayer filter pigment are as follows:
1. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
2. the second dielectric layer is made of silicon dioxide, and the optical thickness is 1.7 QWOT;
3. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
4. the first dielectric layer is made of silicon dioxide, and the optical thickness is 3.4 QWOT;
5. the reflecting layer is made of aluminum alloy material, and the physical thickness is 80 nm;
6. the first dielectric layer is made of silicon dioxide, and the optical thickness is 3.4 QWOT;
7. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
8. the second dielectric layer is silicon dioxide, and the optical thickness is 1.7 QWOT.
9. The semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
with only a single filtering of the structures 3, 4, 5, 6, 7, the reflection integral color separation curve is shown in fig. 5, while with the addition of the differential secondary filter layer, the reflection integral color separation curve is shown in fig. 6. In fig. 6, the reflectance curve peaks are almost close to those in fig. 5, but the reflectance in other wavelength bands is relatively low, and the direct visual expression is excellent in hue monochromaticity.
As can be seen from a comparison of fig. 7 and 8, the differential secondary filtering adjusts the hue position in the chromaticity diagram:
| x coordinate | Y coordinate | Brightness of light | |
| Single pass filtering | 0.161 | 0.098 | 10.36 |
| Differential secondary filtering | 0.272 | 0.163 | 18.69 |
The design of optical power difference filtering is different from peak shift difference filtering; when the optical power difference filtering is implemented as the second filtering, the parameters of the filter cavity are selected to remain within the color gamut, unlike the first embodiment.
When the optical multiple difference filtering is implemented, it can be seen that the optical thicknesses of the first dielectric layer and the second dielectric layer are in integral multiple relation.
The integrated color of the product prepared by optical multiple difference filtering is compared with the existing color, and the product has obvious color difference no matter at zero angle, 45 angle or 60 angle; the special color is the pigment with the anti-counterfeiting effect which is not owned by the people pursuing in the anti-counterfeiting field.
Example three: (near peak differential filtering based on optical power differential filtering):
this example provides a multilayer optical filter pigment having the structure:
semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.
Reference wavelength selection λ0500nm, thickness monitored using optical thickness QWOT;
1. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
2. the second dielectric layer is made of silicon dioxide, and the optical thickness is 1.75 QWOT;
3. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
4. the first dielectric layer is made of silicon dioxide, and the optical thickness is 3.4 QWOT;
5. the reflecting layer is made of aluminum alloy material, and the physical thickness is 80 nm;
6. the first dielectric layer is made of silicon dioxide, and the optical thickness is 3.4 QWOT;
7. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
8. the second dielectric layer is silicon dioxide and has an optical thickness of 1.75 QWOT.
9. The semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
in the embodiment, the near-peak difference filtering is performed on the basis of the optical multiple difference filtering, and two design ideas are superposed in the implementation.
Example four: (inducible near-peak differential filter pattern):
this example provides a multilayer inducible optical filter pigment having the structure:
semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/reflective layer/inducible reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.
Reference wavelength selection λ0500nm, thickness monitored using optical thickness QWOT;
1. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
2. the second dielectric layer is made of silicon dioxide, and the optical thickness is 2.35 QWOT;
3. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
4. the first dielectric layer is made of silicon dioxide, and the optical thickness is 2.4 QWOT;
5. the reflecting layer is made of aluminum alloy material, and the physical thickness is 40 nm;
6, the inducible reflecting layer is made of a magnetic material, can be made of a monomer of iron, chromium or nickel, and has the physical thickness of 30 nm;
7. the reflecting layer is made of aluminum alloy material, and the physical thickness is 40 nm;
8. the first dielectric layer is made of silicon dioxide, and the optical thickness is 2.4 QWOT;
9. the semi-reflecting layer is made of titanium material, and the thickness is 8 nm;
10. the second dielectric layer is silicon dioxide, and the optical thickness is 2.35 QWOT.
11. The semi-reflecting layer is made of titanium material, and the thickness is 8 nm.
The magnetic material is not limited to the embodiment, and may be an alloy containing iron, cobalt, and nickel.
In the embodiment, the multiple-time difference filtering pigment is also upgraded to the inducible multiple-time difference filtering pigment by adding the magnetic layer, namely, the inducible reflecting layer is added on the basis of the difference secondary filtering.
Claims (9)
1. A multilayer light filtering pigment characterized by: it is a sheet-like multilayer structure of:
semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.
2. A multilayer filter pigment according to claim 1, wherein: the first dielectric layer and the second dielectric layer have different reference center wavelengths and different optical thicknesses.
3. A multilayer filter pigment according to claim 2, wherein: the first dielectric layer and the second dielectric layer are made of magnesium fluoride, silicon dioxide or cryolite.
4. A multilayer filter pigment according to any one of claims 1 to 3, wherein: the thickness of the first dielectric layer and the second dielectric layer is optical thickness QWOT, the value of the correspondingly selected reference wavelength lambda 0 is 300-800 nm, and the physical thickness is 100-5000 nm.
5. A multilayer filter pigment according to claim 4, wherein: the physical thickness and the optical thickness of the first dielectric layer and the second dielectric layer are close to but different from each other; or the optical thicknesses of the first dielectric layer and the second dielectric layer are different by multiple; or on the basis that the optical thicknesses of the first dielectric layer and the second dielectric layer are different in multiple, the physical thicknesses of the first dielectric layer and the second dielectric layer are close but different, so that the peak values of the reflectivity curves of the first dielectric layer and the second dielectric layer are close but not coincident.
6. A multilayer filter pigment according to claim 5, wherein: the physical thicknesses of the first dielectric layer and the second dielectric layer are close to but different from each other, and specifically include: the difference between the physical thicknesses of the first dielectric layer and the second dielectric layer is larger than 5 angstroms and smaller than 150 angstroms.
7. A multilayer filter pigment according to claim 1, wherein: the reflecting layer is made of aluminum or aluminum alloy.
8. A multilayer filter pigment according to claim 1, wherein: the semi-reflective layer is made of titanium, iron, silver or chromium.
9. A multilayer filter pigment comprising the multilayer filter pigment according to any one of claims 1 to 7, wherein an inducible reflective layer is added to the multilayer filter pigment, and wherein the inducible reflective layer is upgraded to an inducible multi-fold differential filter pigment: semi-reflective layer/second dielectric layer/semi-reflective layer/first dielectric layer/reflective layer/inducible reflective layer/first dielectric layer/semi-reflective layer/second dielectric layer/semi-reflective layer.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1471562A (en) * | 2000-09-22 | 2004-01-28 | �Ʒ� | Optically variable pigments and foils with enhanced color shifting properties |
| CN105182458A (en) * | 2015-09-29 | 2015-12-23 | 厦门汉盾光学科技有限公司 | Optical chromotropic anti-counterfeiting pigment |
| CN109031494A (en) * | 2018-09-05 | 2018-12-18 | 任磊 | A kind of all dielectric filter pigment |
| CN110109206A (en) * | 2019-04-09 | 2019-08-09 | 甄欣 | A kind of inducible filter pigment |
| CN111171600A (en) * | 2020-01-06 | 2020-05-19 | 惠州市华阳光学技术有限公司 | Optically variable pigment flake |
-
2020
- 2020-06-15 CN CN202010542906.1A patent/CN111812761A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1471562A (en) * | 2000-09-22 | 2004-01-28 | �Ʒ� | Optically variable pigments and foils with enhanced color shifting properties |
| CN105182458A (en) * | 2015-09-29 | 2015-12-23 | 厦门汉盾光学科技有限公司 | Optical chromotropic anti-counterfeiting pigment |
| CN109031494A (en) * | 2018-09-05 | 2018-12-18 | 任磊 | A kind of all dielectric filter pigment |
| CN110109206A (en) * | 2019-04-09 | 2019-08-09 | 甄欣 | A kind of inducible filter pigment |
| CN111171600A (en) * | 2020-01-06 | 2020-05-19 | 惠州市华阳光学技术有限公司 | Optically variable pigment flake |
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Application publication date: 20201023 |