Vehicle lamps with uniform apparent brightness

Abstract

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 lmeasured radially from the focus and perpendicular to an optical axis of the reflector, and an initial depth d-initmeasured parallel to the optical axis. For each element, a light-angle αis calculated, the angle of light from the light source subtended by the element. An Apparent Brightness is found for each element, AB≡α/l. The element ewith the lowest Apparent Brightness ABis identified. For each element other than ea required light-angle is found, the required light-angle α-corr=AB×l. While maintaining l, the initial depth d-initof the element is reduced to a corrected depth d-corrnecessary to achieve α-corr.