| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source device in which the use efficiency of light source light is increased by reducing invalid light not used for image formation and to provide a projection device.SOLUTION: In a light source device 60, an excitation light irradiation device 70 being a first light source and a fluorescent plate device 100 including a fluorescent plate 101 on which a phosphor layer for making emission light from the excitation light irradiation device 70 being the first light source excitation light and an area for transmitting or diffusively transmitting the emission light from the excitation light irradiation device 70 being the first light source are provided are arranged. A red light source device 120 being a second light source is arranged to face the excitation light irradiation device 70 being the first light source across the fluorescent plate device 100. A projection device 10 comprises the light source device 60 formed in such a manner, a display element 51, a projection optical system 220, and the like. |
