Resumen
The present invention provides a light source device which is safe for human eyes and whose switching is performed at high speed. The light source device comprising one or more laser light source 1 for monochromatically or polychromatically emitting, a diffuser 3 (transmissive, reflective or mixture) for diffusing the light bundle injected directly from the laser light source 1 or via the optical focusing system 2 , and the optical system 4 which is referred to as a collimator for collimating the diffused light bundle emitted from the diffuser 3.