| 摘要 |
PROBLEM TO BE SOLVED: To efficiently cool not only a light-emitting element group composed by two-dimensionally arranging light-emitting elements, but also a light returning member for returning light emitted from the light-emitting element group toward a two-dimensional direction inner side of the light-emitting element group.SOLUTION: A light source unit 1 emits, toward an irradiated object, light emitted from a light-emitting element group constituted by arranging light sources 11-1 to 11-12 on a light source support 13 in a two-dimensional direction. The light source unit includes a second reflection mirror 10 (light returning member) which is arranged facing the light source support so as to provide a space with the light source support on a light irradiation side of the light-emitting element group, and which returns light emitted from the light-emitting element group toward a two-dimensional direction inner side of the light-emitting element group. A flow channel for cooling air is formed so that the cooling air supplied by an axial fan 3 passes through the space. |
