Optoelectronic sensor unit for determining precipitation on motor vehicle windscreen and external light

摘要

The unit has a light source and detector coupled to light-conducting measurement stretches to detect precipitation, and separate stretches coupled to further detectors to measure external light from at least two directions. The unit has a light-conducting structure at least partly coupled to the inner face of the windscreen (6) along a front face running parallel to the screen. The structure comprises several measuring paths that are mostly separate from each other. A light source and a detector for detecting internal light are arranged on the rear side of the light-conducting structure, so that they are turned away from the windscreen, and are coupled to at least one materially-bonded measuring path (1,2), to measure precipitation. In addition, several materially-bound measuring paths (3-5) are provided, which are each coupled to a light detector for detection external light from at least two directions in predefined solid angles.