{TAIL ~ 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 {HEAD ~ the ridge} like inclined surfaces serve as a light receiving surface with the light source arranged thereon 
{ TAIL ~ 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 { HEAD ~ the ridge } like inclined surfaces serve as a light receiving surface with the light source arranged thereon
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