ROAD VEHICLE LIGHTING SYSTEM IN WHICH SAME SHUTTER OBSCURES PHOTOCELL WHEN SYSTEM IS OPERATIVE AND WHEN IT IS NOT ENERGIZED

摘要

A lighting system for a road vehicle has the projector for producing a beam of light illuminating the road in front of the vehicle and a receiver with a photocell for receiving light from an oncoming vehicle. There is a first shutter movable to progressively cut off the projected beam, and a second shutter movable to progressively mask the photocell from light from an oncoming vehicle, so that the system achieves a condition wherein sufficient of the projected beam is cut off to avoid dazzling the driver of the oncoming vehicle. The second shutter is returned to a rest position, wherein the photocell is masked, when the projector is not energized, and means is provided for moving the second shutter, when the projector is energized to an inoperative position wherein light can fall on the photocell. This prevents saturation of the photocell during daylight hours.