defined at the upper portion and the lower portion between the inner yoke 10 and the outer yoke 20 and coil units are disposed in the spaces that is an upper coil unit 40 and a lower coil unit 50 are arranged up and down in parallel the upper coil unit 40 and the lower coil unit 50 are fixed to the housing in order not to vibrate the coil unit includes a coil wound a predetermined number of time such that current flows through the controller and the amplifier which are described above on the other hand as shown in fig3 and 4 the vibration absorber according to an exemplary embodiment of the present invention further includes a coil housing 30 protecting the coil units and facilitating discharge of heat when the yoke assembly vibrates the coil housing 30 may be disposed above and under the outer yoke 20 and divided into an upper coil housing 30 a and a lower coil housing 30 b further a plurality of holes 31 is formed along the circumference of the coil housing 30 to facilitate discharge of heat due to vibration of the yoke assembly in more detail when the coil housing 30 is formed by combining the upper coil housing 30 a with the lower coil.