Patent ID: 7854525

Claim:
A planar light source in which a plurality of linear light sources are arranged in parallel between a reflector and a diffuser that are disposed in parallel, and a reflective chevronwise partition plate is provided between adjacent linear light sources such as to project in a shape of a chevron from the reflector, wherein a reflective planar partition plate is provided, connected to a peak section of the reflective chevronwise partition plate such as to project upwards from the peak section, and when a vertical distance from the reflector to a peak section of the planar 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 diameter of the linear light source is D, and a foot angle of the chevronwise partition plate is θ, following conditions ( 1 ) and ( 2 ) are met: T≧ ( H+Q )/2− D/ 2 (1) θ<90°−arc tan( Q/L ) (2).