ILLUMINATION DEVICE AND PROJECTOR

摘要

An illumination device includes a light source device, a uniformization optical system which uniformizes the illuminance distribution of light from the light source device on a region to be illuminated, and a diffraction optical element which is provided in an optical path between the light source device and the uniformization optical system, and rotates around a predetermined rotation axis. The diffraction optical element includes a first region which forms a first illuminance distribution, and a second region which is provided at a position different from the first region around the rotation axis, and forms a second illuminance distribution different from the first illuminance distribution.

主权项

1. An illumination device comprising:
a light source device; a uniformization optical system which uniformizes the illuminance distribution of light from the light source device on a region to be illuminated; and a diffraction optical element which is provided in an optical path between the light source device and the uniformization optical system, and rotates around a predetermined rotation axis, wherein the diffraction optical element includes
a first region which forms a first illuminance distribution, anda second region which is provided at a position different from the first region around the rotation axis, and forms a second illuminance distribution different from the first illuminance distribution.