| 摘要 |
A retroreflection device, wherein the first reflective side surface of a fir st triangular pyramid type retroreflective element is positioned on the same plane as the first side surface of a four-face type retroreflective element, the second reflective side surface of the first triangular pyramid type retroreflective element is positioned on the same plane as the second side surface of the four-face type retroreflective element, the third reflective side surface of the first triangular pyramid type retroreflective element is positioned parallel with one of two surfaces forming a V-shaped groove, the third reflective side surface of the second triangular pyramid type retroreflective element is positioned on the same plane or parallel with the other of two surfaces forming the V-shaped groove, and the third reflective side surface of the four-face type retroreflective element is positioned on the same plane as one of two surfaces forming the V-shaped groove. |
