| 摘要 |
An optical body includes a substrate having a concave-convex surface, a reflecting layer formed on the concave-convex surface, and an optical layer formed on the reflecting layer to embed the concave-convex surface, wherein the reflecting layer directionally reflects light, the concave-convex surface is made up of a plurality of triangular pillars arrayed in a one-dimensional pattern, and the triangular pillar has an apex angle a and a slope angle &bgr;, the apex angle α and the slope angle &bgr; satisfying a formula (1) or (2) given below: 30≦̸&bgr;≦̸4.5α−285 (70≦̸α≦̸80)  (1) 30≦̸&bgr;≦̸−1.5α+195 (80≦̸α≦̸100)  (2) |
