abstract |
PROBLEM TO BE SOLVED: To provide an optical filter having a plurality of transmission wavelength bands and a surface light source device using the same, characterized in that they can be manufactured easily and with good reproducibility. SOLUTION: An optical filter 2 according to the present invention is characterized in that at least two or more bandpass filters 21 and 22 having different reflection wavelength bands are overlapped and formed. Further, the surface light source device 10 according to the present invention Comprises a surface light source 1 that emits light having a plurality of peak wavelengths in a planar shape, and an optical filter 2, and a transmission wavelength band of the optical filter 2 is set to correspond to the plurality of peak wavelengths of the surface light source 1. Have been. |