Projection device and projection-type video display device

A illumination device illuminating a plurality of illuminated regions, comprising:

• an optical element comprising a plurality of light diffusion elements capable of diffusing light;
• and
• an irradiation device configured to irradiate the optical element with a plurality of illumination light beams, each illumination light beam scanning the corresponding light diffusion element,
• wherein the illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding illuminated region, and
• wherein the irradiation device comprises:
• a light source configured to generate a coherent light beam;
• a light division unit configured to divide the coherent light beam from the light source to generate a plurality of divided light beams;
• a scan device configured to change propagation direction of each divided light beam from the light division unit;
• and
• optical fibers, each optical fiber transmitting each divided light beam incident from the scan device and irradiating the optical element with each divided light beam as each illumination light beam, and
• wherein the scan device allows each illumination light beam to scan the corresponding light diffusion element.

A illumination device illuminating a plurality of illuminated regions, comprising:

• an optical element comprising a plurality of light diffusion elements capable of diffusing light;
• and
• an irradiation device configured to irradiate the optical element with a plurality of illumination light beams, each illumination light beam scanning the corresponding light diffusion element,
• wherein the illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding illuminated region, and
• wherein the irradiation device comprises:
• a light source configured to generate a coherent light beam;
• a light division unit configured to divide the coherent light beam from the light source to generate a plurality of divided light beams;
• mirror optical systems, each mirror optical system transmitting each divided light beam from the light division unit;
• and
• a scan device configured to change propagation direction of each divided light beam incident from the mirror optical systems and allow each divided light beam as each illumination light beam to scan the corresponding light diffusion element.

An illumination device illuminating a plurality of illuminated regions, comprising:

• an optical element comprising a plurality of light diffusion elements capable of diffusing light;
• and
• an irradiation device configured to irradiate the optical element with a plurality of illumination light beams, each illumination light beam scanning the corresponding light diffusion element,
• wherein the illumination light beam, which is incident to each position of each light diffusion element to be diffused, overlappedly illuminates on corresponding illuminated region, and
• wherein the irradiation device comprises:
• a light source configured to generate a coherent light beam;
• a scan device configured to change a propagation direction of the coherent light beam from the light source;
• a collimation optical system configured to collimate the coherent light beam from the scan device;
• a light division unit configured to divide the collimated coherent light beam to generate a plurality of divided light beams;
• and
• mirror optical systems, each mirror optical system transmitting each divided light beam from the light division unit and irradiating the optical element with each divided light beam as each illumination light beam, and
• wherein the scan device allows each illumination light beam to scan the corresponding light diffusion element.