Patent ID: 8817267

Claim:
An optical filter comprising: a first substrate; a second substrate which faces the first substrate; a first optical film which is provided on the first substrate, the first optical film having a first light reflective band and having a first light reflective characteristic that is determined by light reflectance of each wavelength within the first light reflective band; and a second optical film which is provided on the second substrate to face the first optical film, the second optical film having a second light reflective band and having a second light reflective characteristic that is determined by light reflectance of each wavelength within the second light reflective band, wherein the first optical film is configured by stacking a plurality of first layers, and the second optical film is configured by stacking a plurality of second layers, each of the plurality of first layers has a first thickness, and each of the plurality of second layers has a second thickness that is different from the first thickness, the first reflective characteristic is different from the second reflective characteristic, and when a first center wavelength of the first optical film is λ 1 , a second center wavelength of the second optical film is λ 2 , and a filter center wavelength in a spectral band of the optical filter is λ 3 , λ 1 <λ 3 <λ 2 is established.