The side surfaces of the light guide plate with the light sources provided thereon have a ridge like inclined surface formed thereon, when viewed from the illuminating surface, and the ridge like {HEAD ~ inclined surfaces} serve as {TAIL ~ a light receiving surface} with the light source arranged thereon 
The side surfaces of the light guide plate with the light sources provided thereon have a ridge like inclined surface formed thereon , when viewed from the illuminating surface , and the ridge like { HEAD ~ inclined surfaces } serve as { TAIL ~ a light receiving surface } with the light source arranged thereon
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