Light irradiation device, fixing device, and image forming apparatus

A light irradiation device comprising:

• a plurality of first irradiation units configured to irradiate with light beams an irradiation target area on a surface,
• wherein the plurality of first irradiation units are arranged in a first direction;
• and
• a plurality of second irradiation units configured to irradiate with light beams outer areas of the irradiation target area,
• wherein the plurality of second irradiation units are arranged at outer sides of the first irradiation units in the first direction,
• wherein light beams emitted from two adjacent irradiation units, from among the plurality of first irradiation units and the plurality of second irradiation units, are superimposed with each other in the first direction,
• wherein one of the second irradiation units is arranged adjacent to a first one of the first irradiation units in the first direction,
• wherein a second one of the first irradiation units is arranged adjacent to the first one of the first irradiation units in the first direction,
• wherein the one of the second irradiation units is configured to emit a first light beam,
• wherein the first one of the first irradiation units is configured to emit a second light beam,
• wherein the second one of the first irradiation units is configured to emit a third light beam, and
• wherein a first irradiation width of the surface in the first direction that is irradiated with the first light beam, and is not superimposed with the second light beam, is smaller than a second irradiation width of the surface in the first direction that is irradiated with the second light beam, and is not superimposed with the third light beam.