Phantom light suppressor for signal lamp with reflector - has ambient light absorber in emergent light beams region of dispersion lenses

摘要

A collimating or converging lens (40) is arranged coaxially in parallel with the light beams emerging from a reflector (1) with a light source (2) at its focal point. A dispersing or diverging lens (41) follows along the optical axes as a screen to include the whole beam in the direction of the reflection, at a distance corresp. to the focal length of the collimating lens. The dimensions of the diverging lenses corresp. to the size of the focal spot of the converging lens involved so that nearly all the light is captured. In the region between the rays from the diverging lenses there is an external light absorber (42,52). The diverging lenses have the same refractive power as the converging lenses but opposite in direction so that the light emerges again as a parallel beam. The lens are formed in pairs, in strips, on the surfaces of the discs (4;4A,4B). USE/ADVANTAGE - Weakening of any incident light, while parallel signal light is transmitted almost without loss. Signalling lamps.