Patent ID: 8461728

Claim:
A linear vibrator, the linear vibrator comprising: a case providing an inner space; a vibrator including a yoke formed with a circular plate-shaped wing unit, a one inner lateral end-closed, cylindrical insertion unit bent from the wing unit to have a stair, an inner magnet coupled by being inserted into the insertion unit, and an external magnet coupled to one surface of the wing unit; an elastic member fixed at one end to the case and fixed at the other end to the vibrator; a stator fixed to the case to vibrate the vibrator; a weight, which is made of a magnetic material, coupled to the other surface of the wing unit; and a magnetic fluid coated in a ring shape on a space formed by the yoke and the elastic member to fix a position by magnetic flux leaked from the inner magnet, wherein each of the inner and external magnets has an opposite magnetic polarity to a direction of vibrating the vibrator.