| 摘要 |
A multiple-lights-combining illumination device includes multiple light sources, multiple sub-rod integrators that respectively guide light from the multiple light sources, and a main rod integrator that guides light from the multiple sub-rod integrators. Each of the sub-rod integrators has reflection surfaces that are parallel to each other in a longitudinal direction, and has an entrance surface and an exit surface that are parallel or perpendicular to each other at ends thereof, the main rod integrator has reflection surfaces that are parallel to each other in a longitudinal direction, and has an entrance surface and an exit surface that are perpendicular to the reflection surfaces at ends thereof, and each reference optical axis that passes through an optical centroid portion of a light-emitting part of the light sources along a light emission direction is arranged so as to pass through substantially a center of the entrance surface of the respective sub-rod integrator. It is possible to use efficiently light while obtaining high intensity by combining light from multiple light sources, and furthermore possible to obtain a small and inexpensive device. |
