Patent attributes
An analyzer includes an optical tunable filter 1 for selectively outputting light having a predetermined wavelength, and a PD 421 for receiving light outputted from the optical tunable filter 1 and then passed through or reflected by an object to be measured. The optical tunable filter 1 includes a first substrate 3 including a movable portion 31 having a light transmitting property; a second substrate 2 having a light transmitting property, the second substrate being provided so as to be opposed to the first substrate; a first gap 21 and a second gap 22 which are respectively provided between the movable portion 31 of the first substrate 3 and the second substrate 2; an interference portion which cases interference with light that enters the optical tunable filter 1 and that has the predetermined wavelength between the movable portion and the second substrate 2 by means of the second gap 22; and a driving portion for changing a distance of the second gap 22 by displacing the movable portion 31 with respect to the second substrate 2 using the first gap 21.
