Patent ID: 7366392

Claim:
A lighting device, comprising: a point light source for emitting light; a light guide plate having a light incident surface on which light from the point light source is incident and a light exit surface, the light guide plate guiding light from the point light source that is incident on the light incident surface to the light exit surface; and a plurality of micro-structures inwardly recessed in a surface of the light guide plate that is opposite to the light exit surface for scattering light from the point light source that is incident on the light incident surface, a longitudinal direction of each of the micro-structures being substantially aligned with a direction in which the light from the point light source is incident on each of the micro-structures, and each of the micro-structures having a concave shape and an inclined surface for reflecting the incident light toward the light exit surface of the light guide plate, a base line of the inclined surface of each micro-structure being disposed substantially orthogonal to the direction in which the light from the point light source is incident on each of the micro-structures.