| abstract |
The disclosure relates to an illumination device including a light source device that emits a bundle of rays including first and second light beams, a collimating optical system, a diffusing element, a first collecting optical system, a first lens array, a second lens array, and a second condensing optical system in this order. The first light beam and the second light beam enter different regions on the diffusing element. A principal ray of the first light beam and a principal ray of the second light beam travel so as to come close to each other toward the first lens array. The diffusing element is provided in the vicinity of a focal position of the first collecting optical system. |