| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a lighting device which inhibits light leakage from a light guide plate thereby achieving high efficiency.SOLUTION: A light guide plate 13 includes: a light incident part 21 into which light of an LED element enters; a light deflection part 22 which deflects the light entered from the light incident part 21 in a light guide direction perpendicular to an optical axis direction of the LED element; and a light emission part 23 which emits the light deflected by the light deflection part 22. In the light deflection part 22, a groove part 22a forming a V shape when viewed from the light guide direction is formed along the light guide direction.</p> |
