The invention relates to an illuminating device comprising a light source (1, 9), disposed along a line, for illuminating a line surface (3), and at least one linear optical element (2, 10). In order to compensate for the vignetting produced by the optical element (2, 10), a diaphragm (6) is provided...http://www.google.fr/patents/US20050117336?utm_source=gb-gplus-shareBrevet US20050117336 - Line illumination
