Patent ID: 6798940
Filing Date: 2004-09-28
Classification: G02B

Abstract:
An optical tunable filters comprising:a fixed mirror including a number of first erecting plates; a movable mirror including a number of second erecting plates; an air gap disposed between the fixed mirror and the movable mirror; and an actuator reciprocating the movable mirror for changing the width of the air gap, wherein the actuator includes: a moving unit, which is coupled to the moving mirror, having a first electrode; a fixed unit, which is coupled to the fixed mirror, having a second electrode for generating an electrostatic force to pull the moving unit by reacting to the first electrode in order to control a gap between the moving unit and the fixed unit; and an elastic member disposed between the fixed mirror and the movable mirror connecting the moving mirror and the moving unit for delivering kinetic force of the moving unit in an adjustable manner with a predetermined ratio in order to finely control the air gap between the fixed mirror and the moving mirror.