visual alarm system, particularly for railway signalling steps

摘要

the visual alarm system, particularly for railway signalling steps includes a lens asferica and more light sources, each equipped with a parabolic reflective elementand a filter dicroico.the filters are arranged in a pentagonal shape dicroici; between the lens asferica and its focal point, the device also includes a lens in order to collect x-rays luparallel minosi from at least one of the light sources, and divergendoli dilate them towards the lens asferica which in turn makes them again in parallel.