Patent ID: 8721087

Claim:
A light source device comprising: plural light sources arranged in a plane; plural collimator lenses each of which is disposed in a vicinity of a corresponding one of the light sources, each of the collimator lenses collimating a light beam emitted from the corresponding light source; and a holder that holds the light sources and the collimator lenses, wherein the holder holds the light sources and the collimator lenses so that optical axes of the collimator lenses are respectively shifted parallel to optical axes of the light sources by shift lengths that are set so that light beams emitted from the light sources via the collimator lenses are focused on a certain region of an illumination subject body, wherein the light beams emitted from the light sources are refracted by the collimator lenses and focused on the certain region, and wherein the holder holds the light sources and the collimator lenses such that the light sources are arranged in rows and columns in a plane and the collimator lenses are arranged in rows and columns in a plane, and such that the shift length of each collimator lens with respect to the corresponding light source is set according to a distance between the corresponding light source and a center of a region where the light sources are arranged in a plane in the holder.