Optical device

An optical device comprising:

• a base;
• a movable portion which includes an optical function unit;
• an elastic support portion which is connected between the base and the movable portion and supports the movable portion so that the movable portion is movable along a first direction;
• a first comb electrode which is provided to the base and includes a plurality of first comb fingers;
• and
• a second comb electrode which is provided to at least one of the movable portion and the elastic support portion and includes a plurality of second comb fingers alternately arranged with the plurality of first comb fingers,
• wherein the elastic support portion includes a torsion bar extending along a second direction perpendicular to the first direction and a nonlinearity relaxation spring connected between the torsion bar and the movable portion,
• wherein the nonlinearity relaxation spring is configured so that a deformation amount of the nonlinearity relaxation spring around the second direction is smaller than a deformation amount of the torsion bar around the second direction and a deformation amount of the nonlinearity relaxation spring in a third direction perpendicular to the first direction and the second direction is larger than a deformation amount of the torsion bar in the third direction while the movable portion moves in the first direction, and
• wherein the first comb finger and the second comb finger which are adjacent to each other face each other in the second direction.