LIGHT SIGNAL DEVICE AND METHOD FOR ASCERTAINING THE DEGREE OF SOILING OF A SHUTTER DISC FOR A SIGNAL GENERATOR

摘要

A light signal device includes at least one light sensor and a signal generator which has a light source and a shutter disk. An inner side of a screening stop, which protects the shutter disk, holds at least one reflector element which reflects a portion of the light emitted by the light source in the direction of the at least one light sensor. A method for ascertaining the degree of soiling of a shutter disk for a signal generator is also provided.