LIGHTING FIXTURE WITH ASYMMETRIC DISTRIBUTION OF LIGHT FLUX RELATIVE TO OPTICAL AXIS Russian patent published in 1999 - IPC

FIELD: light signaling systems for traffic control and other similar purposes. SUBSTANCE: lighting fixture available in four design versions has matrix of light-emitting diodes functioning as light sources and two lens rasters. Lens raster first along optical beam travel has condenser lens sections and second one along optical beam travel functions as dissipater of light flux relative to optical axis required for traffic lights and similar lighting fixtures. Lighting fixture versions differ in design of external dissipater. Uneven distribution of light flux in horizontal and vertical planes is provided by means of two optical surfaces of lens sections of external dissipater with relatively perpendicular optical axes. External dissipaters of three last versions are designed to provide additional uneven light distribution in vertical plane and to direct at least main portion of light up or down of horizontal optical axis of lighting fixture which is necessary for traffic light operation because part of light is useless and does not reach observers when light flux is uniformly distributed in vertical plane. EFFECT: improved efficiency of lighting fixture due to optimal distribution of light flux. 15 cl, 16 dwg