Patent ID: 9273999
Filing Date: 2016-03-01
CPC Classification: G01J

Claim Text:
1. A spectroscopic sensor comprising: an interference filter unit, having a cavity layer and first and second mirror layers opposing each other through the cavity layer, for selectively transmitting therethrough a predetermined wavelength range of light according to an incident position thereof from the first mirror layer side to the second mirror layer side; and a light detection substrate, having a light-receiving surface for receiving the light transmitted through the interference filter unit, for detecting the light incident on the light-receiving surface; wherein the interference filter unit has a first filter region corresponding to the light-receiving surface as seen in a predetermined direction intersecting the light-receiving surface and a ring-shaped second filter region surrounding the first filter region as seen in the predetermined direction; wherein the distance in the predetermined direction between the first and second mirror layers varies in the first filter region; and wherein the distance in the predetermined direction between the first and second mirror layers is fixed in the second filter region.