Patent ID: 8634073

Claim:
An illumination apparatus in which illuminance of light radiated from a light source in an irradiation surface is adjusted to have high uniformity, the illumination apparatus comprising: the light source that emits a light beam having a rectangular shape; a DMD on which light emitted from the light source is incident and which controls reflection/non-reflection of the incident light by opening/closing control of minute mirrors; an optical system that shapes the light reflected by the DMD; a monitor half mirror that splits the light emitted from the optical system into irradiation light and monitor light; the irradiation surface that is irradiated with the irradiation light; a monitor unit that measures illuminance of the monitor light; and a control unit that transmits a control signal to control opening/closing of the minute mirrors of the DMD to the DMD, based on a measurement result measured by the monitor unit, wherein an illuminance distribution in the irradiation surface is adjusted to a predetermined value, wherein the illumination apparatus further comprises a control half mirror which splits the light emitted from the light source into reflected primary light and transmissive light and a reflection mirror which reflects the transmissive light transmitted through the control half mirror, and wherein the control half mirror and the reflection mirror are disposed between the light source and the DMD along a path of the light beam.