Patent ID: 9389412
Filing Date: 2016-07-12
CPC Classification: G01J,G01N,G02B

Claim Text:
1. A variable-wavelength interference filter comprising: a first substrate; a second substrate opposed to the first substrate; a first reflection layer on the first substrate; a second reflection layer on the second substrate, and opposed to the first reflection layer across a gap; and a gap changing portion which flexes the second substrate in a direction toward the first substrate and thus changes the gap between the first reflection layer and the second reflection layer; wherein the first reflection layer and the second reflection layer have a reflectance characteristic showing a higher reflectance to light with a second wavelength that is shorter than a first wavelength, than a reflectance to light with the first wavelength; the second substrate includes a movable portion provided with the second reflection layer, and a holding portion provided on an outer peripheral part of the movable portion and having a smaller rigidity than the movable portion; and the rigidity of the holding portion is asymmetrical about a center of movement of the movable portion.