| 摘要 |
PROBLEM TO BE SOLVED: To provide a retroreflection material capable of improving the utilization efficiency of light and imparting a variety of color tones to reflected light by emphasizing the optical component of a specified wavelength area by interference and feeding back the colored light of the color tone different from incident light in an incident light advancing direction. SOLUTION: This retroreflection material 10 is provided with a resin layer 14 on a reflection substrate 12 and many transparent fine balls 16 whose grain diameter is 30-80 μm composed of glass or the like are aligned and arranged on the surface layer side. The incident light 18 made incident from an outer part advances into the fine balls 16. Then, at least a part of it is reflected from the fine balls 16 through the resin layer 14 by the reflection substrate 12, is fed back to the fine balls 16 again and advances to the outer part. An interference material layer 22 is provided on the reflection substrate 12. The incident light 18 generates the interference of light at the interference material layer 22 and the reflected light 20 presents the color tone of a wavelength emphasized by the interference action. The interference material layer 22 is constituted of titanium dioxide coated mica. |
