| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical device that can stably correct the displacement of an optical axis.SOLUTION: An illumination optical system 10 of a projector being an optical device includes a light source device 1 comprising a discharge lamp 1 and a reflector 12 that reflects the light emitted from the discharge lamp 11 and emits the reflected light in a certain direction. Into the path of the light emitted from the reflector 12, a parallel glass 9 can be inserted, which corrects the displacement of the optical path resulting from the displacement of the light-emitting position due to the change in the lighting attitude of the discharge lamp 11. |
