LIGHTING DEVICE

摘要

A lighting device is provided with a plurality of light-emitting elements, a light guide plate, and a light-collecting cover. The light guide plate comprises a plurality of concave reflecting sections that are each indented on one part of the back surface thereof and that reflect light that is guided within the plate of the light guide plate to the light-collecting cover side. Each of the concave reflecting sections has a two-tier configuration comprising, from the back surface side of the light guide plate, a frustum section and a cone section. An inclined surface that surrounds the cone section has a smaller taper angle than the taper angle of an inclined surface that surrounds the frustum section. The light-collecting cover comprises a plurality of lens sections that are individually arranged so as to have an optically facing relationship with each of the concave reflecting sections and to collect light reflected at each of the concave reflecting sections in a direction that is perpendicular to the main surface of the light guide plate.