Radio-wave-penetrable layer having metallic luster
Disclosed is a coating layer penetrable by radio wave and having a metallic luster. The coating layer includes a resin layer as an outmost layer to an exterior or front, a metallic texture layer formed on a rear side of the resin layer and comprising a optical film layer including metal oxides having different refractive indexes, and a germanium (Ge) layer to reflect light and a reflection layer formed on the rear side of the metallic texture layer.
1. A coating layer for a vehicle part, comprising:
a resin layer having a front side exposed to an outside and a rear side opposite to the front side;
a metallic texture layer formed on the rear side of the resin layer, wherein the metal texture layer comprises i) an optical film layer comprising metal oxides having different refractive indexes and ii) a germanium (Ge) layer configured to reflect light; and
a reflection layer formed on a rear side of the metallic texture layer.
2. The coating layer of claim 1 , wherein the resin layer is transparent and the reflection layer is opaque.
3. The coating layer of claim 1 , wherein the optical film layer comprises a first refractive layer comprising any one of TiO 2 or Cr 2 O 3 and a second refractive layer comprising SiO 2 .
4. The coating layer of claim 1 , wherein in the optical film layer, the first refractive layer and the second refractive layer are alternately layered, and the first refractive layer is disposed closer to the resin layer than the second refractive layer.
5. The coating layer of claim 1 , wherein the metallic texture layer has a reflectance of about 30% or greater and a reflectance deviation of about 5% P or less in a visible ray region of a wavelength of about 400 to about 700 nm.
6. The coating layer of claim 3 , wherein each of the first refractive layer and the second refractive layer has a thickness of about 10 to 200 nm.
7. The coating layer of claim 3 , wherein the optical film layer comprises three or more layers comprising the first refractive layers and the second refractive layers and has a total thickness of about 300 nm to about 10 μm.
8. The coating layer of claim 4 , wherein the germanium layer is formed on a front side of the optical film layer, on a rear side of the optical film layer, or between the alternately layered first refractive layer and the second refractive layer.
9. The coating layer of claim 8 , wherein the germanium layer has a total thickness of about 50 nm to 5 μm.
10. The coating layer of claim 1 , wherein the front side of the resin layer has a flat or curved front surface having no concavo-convex portion, and the rear side has a surface having a concave portion and a convex portion.
11. The coating layer of claim 1 , further comprising:
a primer layer formed between the resin layer and the metallic texture layer.
12. The coating layer of claim 1 , further comprising:
a masking layer formed between the resin layer and the metallic texture layer, the masking layer covering at least a portion of the metallic texture layer,
wherein the masking layer comprises an opaque paint to cover a remaining portion other than a portion having a predetermined shape.
13. A vehicle part comprising a coating layer of claim 1 .
14. The vehicle part of claim 13 is a front grill of a vehicle.