Patent ID: 9158049
Filing Date: 2015-10-13
Classification: G01J,G02B

Abstract:
1. An optical device comprising: a variable wavelength interference filter that includes an effective transmitting area and that transmits a first light reinforced by multiple interferences out of an incident light; and a telecentric optical system that guides the incident light to the variable wavelength interference filter; wherein the variable wavelength interference filter includes: a first reflecting film, and a second reflecting film facing the first reflecting film across a gap having a center gap and a peripheral gap in the effective transmitting area, the telecentric optical system guides a principal ray of the incident light perpendicularly to one of a plane of the first reflecting film and a plane of the second reflecting film, and collects the incident light in the effective transmitting area of the variable wavelength interference filter, and a gap difference between the center gap and the peripheral gap is within a predetermined nanometric range.