Patent ID: 8400282
Filing Date: 2013-03-19
Classification: B06B,H02K,H04R

Abstract:
1. A multi-function vibration actuator comprising: a magnetic circuit having a plate-shaped magnet magnetized in a thickness direction, a pole piece made of a plate-shaped magnetic material and attached on the one surface of the magnet, and a yoke made of a magnetic material and attached on the other surface of the magnet so as to form a magnetic gap between an end of the pole piece and the yoke; a housing having a substantially cylindrical shape and accommodating the magnetic circuit; a suspension supporting the magnetic circuit toward an inner wall of the housing; a diaphragm blocking the one opening of the housing; and a coil attached to the diaphragm and disposed in the magnetic gap, the magnetic circuit or the diaphragm being vibrated by applying an alternating current to the coil, the other opening of the housing being blocked by a cover, wherein the suspension has a structure where circular-ring-shaped inner and outer circumferential portions are connected to each other with a supporting member, and wherein the outer circumferential portion is formed to protrude from the cover in a direction passing across an outer circumference of the magnetic circuit toward a center of the housing.