Patent ID: 9347887
Filing Date: 2016-05-24
CPC Classification: G01J,G01N,G02B

Claim Text:
1. A wavelength variable interference filter comprising: a first substrate; a second substrate opposed to the first substrate; a first reflective film provided above the first substrate and configured to reflect a part of incident light and transmit a part of the incident light; a second reflective film provided above the second substrate, configured to reflect a part of incident light and transmit a part of the incident light, and opposed to the first reflective film via an inter-reflective film gap, which is a distance between surfaces of the second reflective film and the first reflective film; a first electrode provided above the first substrate; a second electrode provided above the second substrate and opposed to the first electrode via an inter-electrode gap, which is a distance between surfaces of the second electrode and the first electrode; a third electrode surrounding, in a plan view from a thickness direction of the first substrate and the second substrate, the first electrode excluding a part of a circumference of the first electrode and in non-contact with the first electrode and grounded; and a fourth electrode surrounding, in the plan view, the second electrode excluding a part of a circumference of the second electrode and in non-contact with the second electrode and grounded.