Patent ID: 8335336
Filing Date: 2012-12-18
Classification: H04R

Abstract:
1. A vibration device that vibrates in response to an input electrical signal, the vibration device comprising: a diaphragm; a support system member that supports the diaphragm in a manner that allows the diaphragm to vibrate; a tubular voice coil bobbin attached to the diaphragm; a magnet which is disposed on at least one side among an inner circumferential surface side and an outer circumferential surface side of the tubular voice coil bobbin, which is polarized in a vibration direction of the diaphragm, and which forms a magnetic gap on a side that faces the tubular voice coil bobbin; a voice coil which is attached to the tubular voice coil bobbin so as to be disposed within the magnetic gap, which receives the input electrical signal, and which generates a driving force by the input electrical signal having been received and the magnetic gap formed by the magnet, to vibrate the diaphragm and the tubular voice coil bobbin; and a magnetic material member which is attached to the tubular voice coil bobbin so as to be disposed in a balancing position within the magnetic gap, and which is, when vibrating together with the tubular voice coil bobbin, subjected to an action of a magnetic attractive force generated by the magnet in a direction away from the balancing position.