| 摘要 |
PROBLEM TO BE SOLVED: To emit light having uniform brightness distribution with the small number of light-emitting devices in the surface light source having a solid light- emitting device such as an LED. SOLUTION: A solid light-emitting device 14 is arranged on one end side of a prism sheet 11 in which a plurality of flex prism parts 12 being formed in a wave shape along the width direction are arranged on a rear surface 11b, light emitted from the solid light-emitting device 14 is refracted in the width direction of the prism sheet 11 from the flex incident surface 12a which is one side surface of the reflex prism part 12, made incident in a plurality of flex prism parts 12 of the prism sheet 11, the light incident is diffused in the width direction of the prism sheet 11 by the flex refraction surface 12b which is the other side surface of the flex prism part 12, refracted toward the front surface 11a of the prism sheet 11, and goes out in a uniform intensity from the whole region of the front surface 11a of the prism sheet 11. |
