Patent ID: 7212647

Claim:
A multi-function vibrating actuator device, in which there are provided an outer-magnet type of magnetic circuit including a discal yoke with a pole piece at a center thereof, a yoke plate and a ring magnet as a single unit, forming a gap that functions as a magnetic gap between an outer face of the pole piece and respective inner faces of the magnet and yoke plate, a diaphragm fastened to an top of a voice coil, a suspension including a plurality of spring arms that extend along an outer periphery thereof from a support portion for supporting the magnetic circuit, a substantially cylindrical housing that is open on both ends thereof, and a cover, the magnetic circuit being supported within the housing by the suspension, tips of the spring arms of which are attached to the sides of the housing, the voice coil being located within the magnet gap, the opening at one end of the housing being covered by the diaphragm with an outer edge of the diaphragm being attached to a rim of the opening of the housing and the opening at the other end of the housing being covered by the cover with an outer edge of the cover being attached to a rim of the opening of the housing, and the magnetic circuit being made vibrate within the housing by an electrical signal being applied to the voice coil, wherein an air passage hole is formed at least at one part among said housing, cover and diaphragm, and said magnetic circuit is assembled with an outer surface thereof in close proximity to an inner surface of the housing so as to create a clearance between an outer surface of the magnetic circuit and an inner surface of the housing, wherein said clearance is adjusted to be more than 0% and not more than 2.5% of the inside radius of the housing so that a range of frequencies at which said magnetic circuit is able to vibrate can be expanded by restricting the amount of movement of interior air in a space formed by said diaphragm and said magnetic circuit and of interior air in a space formed by said magnetic circuit and said cover.