Patent ID: 9104928
Filing Date: 2015-08-11
Classification: G02B,G06K

Abstract:
1. A light guide for directing a light beam to a photosensor in a scanning system, wherein light is deflected by one or more moving elements in the scanning system into a scanning region, wherein said light guide has a light entry region, a reflecting region for reflecting light entering the light entry region and one or more light exit faces, so that light entering the light guide through the light entry region is at least partly reflected in the reflecting region and exits through one of the exit faces, and wherein the shape and the properties of the light guide are such that for two pencils of light rays, which enter the light guide through the light entry region and leave the light guide through a respective light exit face in an exit zone, a first of the two pencils of light rays is spaced from the second pencil and is non-overlapping with said second pencil of light rays, the first and second pencils of light rays have identical or at least overlapping exit zones in the same exit face and the light guide comprises a diffusely reflecting region and a protruding portion that has a discrete or continuous rotational symmetry with regard to a central axis, said protruding portion comprising said diffusely reflecting region.