Patent ID: 7452087

Claim:
An illumination apparatus illuminating an objective illumination region, comprising: a plurality of illuminants having light-emitting surfaces arranged on a circumference of a circle and on one plane, and radiating diffused light along a center axis of the circle; a light guiding portion configured to guide the diffused light; and a rotating drive portion configured to rotate the light guiding portion around a rotation axis passing through the center of the circle, wherein the light guiding portion comprises: an incident end surface which is configured to be rotated along the circumference by the rotating drive portion and on which the diffused light radiated from an at least one of the light-emitting surfaces opposing to the incident end surface is made incident by the rotation; a reflecting surface configured to change the direction in which the diffused light incident from the incident end surface is guided; and an outgoing end surface configured to output the diffused light reflected by the reflecting surface along the rotation axis.