Patent ID: 8917449

Claim:
An optical filter comprising: a first substrate; a second substrate opposed to the first substrate; a first reflecting section disposed on a first opposed surface of the first substrate, the first opposed surface being opposed to the second substrate; a second reflecting section disposed on a second opposed surface of the second substrate, the second opposed surface being opposed to the first substrate, and the second reflecting section being opposed to the first reflecting section; a first electrode disposed on the first opposed surface of the first substrate at a peripheral position relative to the first reflecting section in a plan view; and a second electrode disposed on the second opposed surface of the second substrate, and opposed to the first electrode, wherein at least one of the first opposed surface and the second opposed surface includes a step section, the first electrode is divided into K segment electrodes electrically isolated from each other, where K is an integer ≧2, the second electrode is a common electrode having the same electrical potential, and in a state that no voltage is applied between the first electrode and the second electrode, a first gap between the first reflecting section and the second reflecting section is smaller than a second gap between the first electrode and the second electrode.