Patent ID: 7794097

Claim:
A planar light source, comprising: a plurality of linear light sources arranged in parallel between a reflector and a diffuser that are disposed in parallel; and a reflective chevronwise partition plate provided between adjacent linear light sources to project in a shape of a chevron from the reflector, wherein, when a vertical distance from the reflector to a peak section of the chevronwise partition plate is T, a vertical distance from the reflector to a center of a linear light source is Q, a vertical distance from the reflector to the diffuser is H, a horizontal distance from the center of the linear light source to a foot section of the chevronwise partition plate is L, a horizontal distance between the centers of adjacent linear light sources is P, a diameter of the linear light source is D, and a foot angle of the chevronwise partition plate is θ, the following conditions (1), (2), and (3) are met: T =( H+Q )/2− D/ 2 (1) θ<90°−arctan( Q/L ) (2) θ<{90°+arctan( T−Q )/( P/ 2)}/2 (3).