| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical filter capable of improving color rendering property while suppressing changes in color temperature, and to provide a light source device and an illumination device capable of improving color rendering property while suppressing decrease in luminous efficiency and changes in color temperature.SOLUTION: An optical filter 1 includes a coating layer 11 having an average reflectance for light that is selectively improved in a wavelength region from green light to yellow light and a wavelength region of blue light. A light source device 2 includes: an LED element 3 that excites blue light; a yellow phosphor 7 where the light radiating from the LED element 3 is transmitted; and the optical filter 1 where the light transmitted in the yellow phosphor 7 is transmitted. An illumination device 15 includes; the LED element 3 that excites blue light; the yellow phosphor 7 where the light radiating from the LED element 3 is transmitted; a reflector 16 that condenses the light transmitted in the yellow phosphor 7; and an optical filter 2 where the light exiting from the reflector 16 is transmitted. |
