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 li measured radially from the focus and perpendicular to an optical axis of the reflector, and an initial depth d-initi measured parallel to the optical axis. For each element, a light-angle αi is calculated, the angle of light from the light source subtended by the element. An Apparent Brightness is found for each element, ABi≡αi/li. The element emin with the lowest Apparent Brightness ABmin is identified. For each element other than emin a required light-angle is found, the required light-angle α-corri=ABmin×li. While maintaining li, the initial depth d-initi of the element is reduced to a corrected depth d-corri necessary to achieve α-corri.
Vehicle lamps with uniform apparent brightness
2016-05-24
Patent
Electronic Resource
English
IPC: | F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF , Funktionsmerkmale oder Einzelheiten von Leuchten oder Beleuchtungssystemen / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / F21S Ortsfeste Leuchten , NON-PORTABLE LIGHTING DEVICES / G01J Messen der Intensität, der Geschwindigkeit, der spektralen Zusammensetzung, der Polarisation, der Phase oder der Pulscharakteristik von infrarotem, sichtbarem oder ultraviolettem Licht , MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED, VISIBLE OR ULTRA-VIOLET LIGHT |