Projection apparatus and projection control apparatus

A illumination apparatus comprising:

• an optical device configured to diffuse incident coherent light beams and change an incident direction of the coherent light beams to each position of an illumination zone with time;
• an irradiation unit configured to irradiate the coherent light beams to the optical device while changing a propagation direction of the coherent light beams by changing angles of the coherent light beams with time so that the coherent light beams scan the optical device;
• and
• an intermediate optical system provided between the optical device and the illumination zone, configured to restrict a diffusion angle of coherent light beams diffused by the optical device,
• wherein, after the diffusion angle is restricted by the intermediate optical system, the coherent light beams diffused by the optical device are superimposed on one another to illuminate at least all the illumination zone, regardless of diffusion points on the optical device,
• wherein the irradiation unit comprises:
• a light source configured to emit coherent light beams;
• and
• a mirror device configured to change a propagation direction of the coherent light beams emitted from the light source to make the coherent light beams scan the optical device.