US Patent 8454214 Vehicular lamp LED-lit curved light guide lens

An LED light source is mounted to a base end of a light guide lens including a distal end curving toward the rear of a vehicle and a functional light distribution portion including light diffusion steps, so that light from the LED light source is diffused toward a side of the vehicle. A design light distribution portion is provided between the LED light source and the functional light distribution portion, having a linear optical step on a rear surface of the light guide lens so as to extend in a longitudinal direction of the lens.