The invention provides an apparatus for digital imaging, the apparatus comprising: a light source for generating an array of light beams； an optics system (5) for focusing the array of light beams； and a light-guiding part having an entrance face (18) and an exit face (19). The light source, the optics system, and the light-guiding part are arranged such that the array of light beams from the light source passes through the optics system, enters the light-guiding part via the entrance face and exits the light-guiding part via the exit face. The optics system is configured such that, before entering the light-guiding part, the outermost marginal rays of the outermost light beams with respect to the optical axis of the optics system are parallel or divergent to the optical axis.
