| 摘要 |
<p>A surface light source device includes a light source (1), a light guide plate (3) for guiding light from the light source to one surface, and a light-condensing member (5) for outputting exit light from the light guide plate (3) in a predetermined direction. The one surface (4) of the light guide plate (3) is a stepped surface whose thickness decreases step by step at a predetermined pitch from one end, at which the light source (1) is arranged, to the other. The light-condensing member (5) is located to face the light guide plate and includes a plurality of prisms (6) for refracting exit light from the light guide plate (3) toward the direction of a normal to the light guide plate (3), and a plurality of lenses (7) for condensing and outputting light in a direction within a predetermined range of angles. <IMAGE></p> |
