Patent Application
20200024185
The present invention relates to a laminated system.
Recently, mobile devices such as smart phones, tablet PCs, etc. have rapidly propagated, and thus, consumers' requirements are becoming more advanced. Particularly, from software to hardware, such devices are evolving day by day to meet those requirements.
As one of the advanced strategies, in the case of hardware, the screen becomes larger, and through the addition of design elements, each manufacturer takes an advanced strategy to build a unique image.
In general, as the mobile devices have much contact with various external environments as well as users' hands, they functionally require not only excellent corrosion resistance and wear resistance but also considerable surface hardness and strength and excellent adhesion, and in terms of appearance, for such devices, high-quality color expression are very important as well as excellent surface texture.
Various chemical and physical coating methods applied to a substrate for high-quality color expression are known. For example, a color coating method using an inorganic pigment dispersed in a polyester resin, a color expressing method on the surface of a substrate using ITO through a vacuum deposition method, and a coating method by coating the surface of a substrate with a thin film through PVD and changing a color by injecting a metal ion or gas ion ionized using an ion injection method have been studied.
However, as a method of expressing the most diverse colors, anodizing may be used, but this method is disadvantageous in that used materials are expensive and there is no high-quality color or transparency required in the emotional age.
Therefore, technology that utilizes a transparent substrate as it is and imparts luxury by implementing ceramic-like deep and soft colors, which is a new trend, is required, and such technology may be applied in various fields as well as mobile devices. For example, there is a demand for technology that can be used for electronic devices including a display panel, and impart luxury by implementing deep and soft colors in various fields such as furniture and home appliances.
(Patent Document 1) Korean Unexamined Patent Application Publication No. 2014-0138467
The present invention is directed to providing a high-reflection laminated system.
In one aspect, the present invention provides a laminated system including a substrate, and a high refractive index layer having a reflective index of 2.0 or more and a thickness of 70 nm or less, which is formed on the substrate.
Since a laminated system according to an exemplary embodiment of the present invention can exhibit transparency, a soft color and a reflection effect, when the laminated system according to the present invention is applied, it is possible to realize a substrate having a deep and soft color with a ceramic texture and/or a high quality texture.
The following drawings accompanying the specification are provided to illustrate preferable embodiments of the present invention and to promote further understanding of the technical spirit of the present invention with the above-described contents of the present invention, and therefore, the present invention should not be construed as being limited to only the details shown in these drawings.
Reference numerals used in the drawings attached to the specification indicate the following:
Hereinafter, embodiments will be described in further detail to help in understanding the present invention.
Terms and words used in the specification and claims should not be construed as limited to general or dictionary meanings, and should be interpreted with the meaning and concept in accordance with the technical idea of the present invention based on the principle that the inventors have appropriately defined the concepts of terms in order to explain the invention in the best way.
A laminated system according to an exemplary embodiment of the present invention includes a substrate, and a high refractive index layer having a refractive index of 2.0 or more and a thickness of 70 nm or less, formed on the substrate.
The laminated system according to an exemplary embodiment of the present invention includes a high refractive index layer having a refractive index of 2.0 or more and a thickness of 70 nm or less, formed on a substrate, thereby exhibiting transparency, a soft color and a reflection effect, and thus imparting a deep and soft color with a ceramic texture or a luxurious texture to the substrate.
Hereinafter, the present invention will be described in detail.
According to an exemplary embodiment of the present invention, the laminated system may include a substrate, and the substrate may include both of a transparent substrate and an opaque substrate, which are specifically formed of glass, polyethylene terephthalate (PET), a high-gloss coated material (also called high glossy), a metal or glass/PET. The refractive index of the substrate may be, for example, 1.50 to 1.52, but the present invention is not limited thereto. The thickness of the substrate may be, for example, 0.3 to 6 mm, but the present invention is not limited thereto.
In addition, according to an exemplary embodiment of the present invention, the laminated system may include a high refractive index layer having a refractive index of 2.0 or more and a thickness of 70 nm or less, formed on the substrate.
Specifically, in the laminated system, the refractive index of the high refractive index layer is 2.0 or more, and more specifically, 2.0 to 3.0, and when the refractive index of the high refractive index layer is within the above range, in the present invention, the desired soft and diverse colors and reflection effect may be excellently realized. In the present invention, the refractive index may be measured using, for example, ellipsometer equipment, but the present invention is not limited thereto.
In addition, the thickness of the high refractive index layer may be 70 nm or less, specifically, 3 to 70 nm, and more specifically, 3 to 60 nm. The laminated system may have reflectance at its surface or coating surface, which varies according to the thickness of the high refractive index layer, and thus a color and sense of depth may be changed. When the thickness of the high refractive index layer is more than 70 nm, the desired reflectance or color in the present invention may not be realized, and therefore a high-quality color or transparency may be degraded.
The realized laminated system may have various structures including a substrate and a high refractive index layer.
Specifically, a laminated system 100 according to an exemplary embodiment of the present invention may be a single-layered system including, as shown in
According to another exemplary embodiment of the present invention, the laminated system may be a multi-layered system, which includes a high refractive index layer formed on a substrate, and further includes a low refractive index layer, which is formed on the high refractive index layer and has a lower refractive index than the high refractive index layer. That is, the laminated system may include the high refractive index layer, the low refractive index layer, or a multi-layered coating layer in which two or more such refractive layers are repeatedly stacked.
A laminated system 200 according to an exemplary embodiment of the present invention may include, as shown in
In addition, a laminated system 300 according to an exemplary embodiment of the present invention may include, as shown in
In addition, a laminated system according to still another exemplary embodiment of the present invention may include a high refractive index layer, a low refractive index layer, a high refractive index layer, a low refractive index layer and a high refractive index layer, which are sequentially stacked on a substrate.
In the laminated system, a repeated stacking number of the high refractive index layer and the low refractive index layer may be variously changed according to a desired design or desired performance without inhibiting the effect of the present invention.
In addition, when the laminated system includes a multi-layered coating layer, the outermost layer of the multi-layered coating layer may be a low refractive index layer or a high refractive index layer, and preferably, a high refractive index layer to realize a desired reflectance and color in the present invention, but the present invention is not limited thereto.
The low refractive index layer may have, for example, a refractive index of 1.8 or less, more specifically, 1.0 to 1.8. According to an exemplary embodiment of the present invention, within the above range, the present invention may realize desired reflectance due to the difference in refractive index between the high refractive index layer and the low refractive index layer, and thus deep, soft and diverse colors may be excellently expressed.
In addition, the thickness of the low refractive index layer may be 70 nm or less, specifically, 3 to 70 nm, and more specifically, 3 to 60 nm. The laminated system may have a different reflectance at a surface or coating surface thereof according to the thickness of the low refractive index layer, and therefore, a color and sense of depth may vary. When the thickness of the low refractive index layer is more than 70 nm, since a desired reflectance or color in the present invention may not be realized, a high-quality color or transparency may be degraded.
In addition, in the laminated system, a high refractive index layer and a low refractive index layer, which have different refractive indexes, may realize soft and diverse colors due to the difference in refractive index between the layers and/or the difference in surface reflectance, but the mechanism of the present invention is not limited thereto.
For example, in the laminated system, the difference in refractive index between the high refractive index layer and the low refractive index layer may be 0.2 to 1.5, and specifically, 0.3 to 1.2. The laminated system including the high refractive index layer and the low refractive index layer, which satisfies the above-mentioned ranges, may satisfy a desired reflectance and color in the present invention, and specifically, a surface reflectance is 8 to 40%, the a* value of the color of the surface coating (laminated surface) is −5 to +5, and the b* value thereof is −10 to +10.
In addition, in the laminated system, the optical thicknesses of the high refractive index layer and the low refractive index layer may be important for realizing the above-mentioned range. Here, the optical thickness refers to the product of a refractive index and a physical thickness of each of the high refractive index layer and the low refractive index layer, which are isotropic optical elements, that is, the product (nd) of the refractive index (n) and the thickness of a medium (d).
In the present invention, the optical thickness of the low refractive index layer may be 3 to 100 nm, and specifically, 3 to 70 nm, and when the optical thickness of the low refractive index layer is more than 100 nm or less than 3 mm, a desired reflectance or color in the present invention may not be realized, and thus a high-quality color or transparency may be degraded.
In the present invention, the optical thickness of the high refractive index layer may be 6 to 180 nm, and specifically, 6 to 100 nm, and when the optical thickness of the high refractive index layer is more than 180 nm or less than 6 nm, since the desired reflectance or color in the present invention may not be realized, a high-quality color or transparency may be degraded.
In addition, when the laminated system according to the present invention is a multi-layered system, the thicknesses of each high refractive index layer and each low refractive index layer may be the same as, or different from each other. For example, a high refractive index layer, a low refractive index layer and a high refractive index layer, which all have a thickness of 20 nm, may be sequentially laminated on a substrate, or a high refractive index layer having a thickness of 15 nm, a low refractive index layer having a thickness of 13 nm, and a high refractive index layer having a thickness of 25 nm may be sequentially laminated on a substrate.
According to an exemplary embodiment of the present invention, in the laminated system, a material of the high refractive index layer satisfies a refractive index of 2.0 or more, and various materials may be used without inhibiting the effect of the present invention. The material of the high refractive index layer may include, for example, one or more materials selected from the group consisting of aluminum nitride, silicon nitride, silicon zirconium nitride, titanium oxide, zinc oxide, tin oxide, zirconium oxide, zinc-tin oxide, chromium oxide and niobium oxide. More specifically, the material of the high refractive index layer may include titanium oxide, silicon nitride or the like, and preferably, silicon nitride.
In addition, according to an exemplary embodiment of the present invention, in the laminated system, a material of the low refractive index layer satisfies a refractive index of 1.8 or less, and various materials may be used without inhibiting the effect of the present invention. The material of the low refractive index layer may include, for example, one or more materials selected from the group consisting of magnesium fluoride, aluminum oxide, silicon oxide, silicon oxynitride, silicon oxycarbide and a silicon-aluminum mixed oxide. More specifically, the material of the low refractive index layer may include silicon nitride, aluminum oxide or the like.
In addition, when the laminated system is a multi-layered system, the types of materials included as the materials of each high refractive index layer and each low refractive index layer may be the same as or different from each other in a range satisfying each refractive index.
According to an exemplary embodiment of the present invention, the surface reflectance of the laminated system may be 8 to 40%, and specifically, 8 to 30%. The surface reflectance, for example, the optical reflectance at a surface or coated surface at a wavelength range of 380 to 780 nm, may be measured using a spectrophotometric transmittance meter (model name: Lambda 950, Perkin Elmer). The color and sense of depth realized may vary according to the surface reflectance of the laminated system. When the surface reflectance of the laminated system is less than 8%, in terms of aesthetics, there may be a problem in realization of a ceramic texture, and when the surface reflectance of the laminated system is more than 40%, there may be a problem in realization of a soft color due to a high reflectance.
In addition, according to an exemplary embodiment of the present invention, in the laminated system, the color of the coating surface indicated by CIELAB color space coordinates at the observer angle of 10° may be represented as the a* value ranging from −5 to +5, and the b* value ranging from −10 to +10. In this range, deep and soft colors with a ceramic texture may be excellently realized.
In the laminated system, a method of laminated a high refractive index layer and a low refractive index layer on a substrate may be, for example, one or more selected from sputtering, evaporation, ion plating and chemical vapor deposition (CVD).
According to an exemplary embodiment of the present invention, various structures may be realized using the laminated system. For example, various structures may be realized as a means for applying or laminated various coating layers on a bottom and/or top surface(s) of the laminated system.
For example, as shown in
In addition, as shown in
As the laminated system according to an exemplary embodiment of the present invention includes a refractive index layer satisfying a refractive index and a thickness in specific ranges, which is formed on a substrate, a transparent and soft color and a reflection effect may be exhibited, and thus the substrate may exhibit a deep and soft color with a ceramic texture or a luxurious texture. In addition, when the refractive index layer is used with a color paint coating composition applied on the bottom surface of the substrate, the color of the organic paint may be realized like a ceramic. Therefore, the laminated system may be effectively used in various purposes including mobile devices.
<Manufacture of Laminated System>
A laminated system including a single-layered coating layer was obtained by laminating TiO2 having a refractive index of 2.4 (ellipsometer) to a thickness of 50 nm on a glass substrate having a thickness of 0.5 mm through sputtering.
A laminated system including a multi-layered coating layer was obtained by sequentially laminating TiO2 (high refractive index layer) having a refractive index of 2.4, SiO2 (low refractive index layer) having a refractive index of 1.4 and TiO2 (high refractive index layer) to respective thicknesses shown in Table 1 below on a glass substrate having a thickness of 0.5 mm through sputtering.
A laminated system including a multi-layered coating layer was obtained in the same manner as in Example 2, except that the thicknesses of TiO2 and SiO2 were changed as shown in Table 1 below.
A laminated system including a multi-layered coating layer was obtained by sequentially laminating SixNy (x=3, y=4, high refractive index layer) having a refractive index of 2.1, Al2O3 (low refractive index layer) having a refractive index of 1.7 and SixNy (x=3, y=4, high refractive index layer) to respective thicknesses shown in Table 2 below on a glass substrate having a thickness of 0.5 mm through sputtering.
A laminated system including a multi-layered coating layer was obtained in the same manner as in Example 7, except that the thicknesses of SiXNy and Al2O3 were changed as shown in Table 2 below.
A laminated system including a multi-layered coating layer was obtained in the same manner as in Example 2, except that the thicknesses of TiO2 and SiO2 were changed as shown in Table 3 below.
A laminated system including a multi-layered coating layer was obtained by sequentially laminating AZO (high refractive index layer) having a refractive index of 1.97, SnO (low refractive index layer) having a refractive index of 1.8 and AZO (high refractive index layer) to respective thicknesses shown in Table 2 below on a glass substrate having a thickness of 0.5 mm through sputtering.
A laminated system including a multi-layered coating layer was obtained by sequentially laminating TiO2 (high refractive index layer) having a refractive index of 2.4, SixNy (x=3, y=4; low refractive index layer) having a refractive index of 2.1 and TiO2 (high refractive index layer) to respective thicknesses shown in Table 5 below on a glass substrate having a thickness of 0.5 mm through sputtering.
A laminated system including a multi-layered coating layer was obtained by sequentially laminating Al2O3 (high refractive index layer) having a refractive index of 1.7, SiO2 (low refractive index layer) having a refractive index of 1.4 and Al2O3 (high refractive index layer) to respective thicknesses shown in Table 6 below on a glass substrate having a thickness of 0.5 mm through sputtering.
A reflectance and the color of a coating surface were measured using the single- or multi-layered laminated system obtained according to each of the examples and the comparative examples as follows, and the result is shown in Tables 7 to 12 below.
(1) Evaluation of Reflectance
The optical reflectance at the coating (surface) of the laminated system prepared in each of the examples and the comparative examples at a wavelength range of 380 to 780 nm was measured using a spectrophotometric transmittance meter (model name: Lambda 950, Perkin Elmer). The average value (Y) was obtained by multiplying the measured optical reflectance and the weighting function corresponding to AM1.5 according to the ISO 9050 standard.
(2) Coating Surface Color
CIELAB color space coordinates at the observer angle of 10° (CIE L*, CIE a*, CIE b*) represent values obtained according to F. W. Billmeyer, Jr., “Current American Practice in Color Measurement,” Applied Optics, Vol. 8, No. 4, pp. 737-750 (April 1969).
All of the laminated systems obtained according to Examples 1 to 9 of the present invention satisfied a reflectance ranging from 8 to 40%, the a* value of the coating surface color was −5 to +5, and the b* value thereof was −10 to +10. On the other hand, the laminated systems of Comparative Examples 1 to 13 did not satisfy the above-mentioned ranges of the reflectance and coating surface color.
Specifically, in the laminated systems of Examples 2 to 6 manufactured by sequentially laminating TiO2 (high refractive index layer) having a refractive index of 2.4, SiO2 (low refractive index layer) having a refractive index of 1.4 and TiO2 (high refractive index layer) to respective thicknesses of 70 nm or less on a glass substrate, the reflectance was approximately 10 to 26%, the a* value of the coating surface color was −3 to 0, and the b* value thereof was −6.0 to +0.6.
On the other hand, in the laminated systems of Comparative Examples 1 to 4 in which, although TiO2, SiO2 and TiO2 were laminated on a glass substrate as in Examples 2 to 6, the thickness of at least one of the high refractive index layer and the low refractive index layer was more than 70 nm, it was confirmed that a reflectance and coating surface color values are out of the desired ranges of the present invention.
In addition, although having refractive indexes different from Examples 2 to 6, in the laminated systems of Examples 7 to 9 in which SixNy (x=3, y=4; high refractive index layer) having a refractive index of 2.1, Al2O3 (low refractive index layer) having a refractive index of 1.7 and SixNy (x=3, y=4; high refractive index layer) were laminated to respective thicknesses of 70 nm or less on a glass substrate, the reflectance was approximately 18 to 22%, the a* value of the coating surface color was −3 to 0, and the b* value thereof was 0 to +4.
However, when both the ranges of the high refractive index and the low refractive index were out of the scope of the present invention, that is, in Comparative Examples 5 to 7 in which AZO having a refractive index of 1.97, SnO having a refractive index of 1.88 and AZO were laminated, although each was laminated to a thickness of 70 nm or less, it was confirmed that the a* value of the coating surface color was out of the scope of the present invention, and both of the a* and b* values of the coating surface color in Comparative Example 7 were out of the scope of the present invention.
In addition, in Comparative Examples 8 to 10 in which each of the three layers implemented as a high refractive index layer was formed on the glass substrate to a thickness of 70 nm or less, it was confirmed that both of the a* and b* values of the coating surface color were out of the scope of the present invention.
In addition, in Comparative Examples 11 to 13 in which each of the three layers implemented as a low refractive index layer was formed to a thickness of 70 nm or less on a glass substrate, it was confirmed that both of the a* and b* values of the coating surface color satisfied the scope of the present invention, but the reflectance was less than 8% and in the range of 6.6 to 7.1%.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2017-0049003 | Apr 2017 | KR | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2018/004449 | 4/17/2018 | WO | 00 |
