| 摘要 |
PROBLEM TO BE SOLVED: To provide a light guide body capable of emitting light to a front direction without using a condenser lens sheet or the like.SOLUTION: A recessed light defecting element is formed on a first main surface of a light guide body. In the cross sectional shape of the element along a light introduction direction, when the refractive index of the light guide body is defined as n, the inclination, from a point connected to the first main surface to an apex, of a contour line near an incidence surface is sin(1/n) or more and 2×sin(1/n) or less. |
