Vehicle Lamps with Uniform Apparent Brightness

摘要

A Parabolic-Type reflector has a uniform Apparent Brightness over the reflector surface. A model of the reflector is divided into a plurality of elements arrayed radially around the reflector focus. Each element has a length l_i measured radially from the focus and perpendicular to an optical axis of the reflector, and an initial depth d-init_i measured parallel to the optical axis. For each element, a light-angle α_i is calculated, the angle of light from the light source subtended by the element. An Apparent Brightness is found for each element, AB_i≡α_i/l_i. The element e_min with the lowest Apparent Brightness AB_min is identified. For each element other than e_min a required light-angle is found, the required light-angle α-corr_i=AB_min×l_i. While maintaining l_i, the initial depth d-init_i of the element is reduced to a corrected depth d-corr_i necessary to achieve α-corr_i.