Patent ID: 10656409

Abstract:
Provided is an illumination device capable of illuminating a partial range in an illumination range at higher or lower brightness than the other ranges without the need of a complicated processing configuration. The illumination device includes a coherent light source that emits a coherent beam, an optical element 3 including a plurality of diffusion subelements 15-1 to 15-9 each of which guides the coherent beam incident thereon, such that the coherent beam illuminates a corresponding one of illumination object subregions 19-1 to 19-9, and an optical scan unit that guides the coherent beam emitted from the coherent light source and thereby scans the coherent beam on the plurality of diffusion subelements 15-1 to 15-9. The plurality of diffusion subelements 15-1 to 15-9 include diffusion subelements differing in size.