Light irradiation apparatus and optical fiber path used in the light irradiation apparatus

A light irradiation apparatus comprising:

• a plurality of light sources;
• a plurality of light transmission paths capable of selectively transmitting lights from the plurality of light sources, respectively;
• an optical fiber path provided with a plurality of light incidence ends receiving respective lights from the plurality of light transmission paths, and a single light exit end;
• and
• a dimming means capable of dimming lights that are incident on the plurality of light incidence ends, respectively,
• the optical fiber path having a plurality of optical fiber bundles, incidence ends of the plurality of optical fiber bundles configuring the plurality of light incidence ends, and exit ends of the plurality of optical fiber bundles configuring the single light exit end by combining themselves;
• a lot of optical fibers constituting the plurality of optical fiber bundles, the optical fibers of the plurality of optical fiber bundles being dispersedly arranged with each other in uniform at the single light exit end,
• each of the dimming means comprises a translation mechanism for mechanically displacing, along an optical axis in parallel, a third optical element for concentrating parallel light from the light source to be incident on the light incidence end of the optical fiber path.