Patent ID: 8022799
Filing Date: 2011-09-20
Classification: B06B,H02K,H04R

Abstract:
1. A multi-function vibration actuator comprising: a magnetic circuit unit having a plate-shaped magnet magnetized in a thickness direction, the plate-shape magnet includes a first surface and a second surface opposite of the first surface, a pole piece made of a plate-shaped magnetic material having a circumference and attached on the first surface of the magnet, and a yoke made of a magnetic material and attached on the second surface of the magnet, a magnetic gap formed between the circumference of the pole piece and the yoke, the magnetic gap having an inner end defined by the circumference of the pole piece and an outer end; a housing accommodating the magnetic circuit unit; a suspension supporting the magnetic circuit unit within an inner wall of the housing, the suspension has an inner circumference; and a coil attached to a diaphragm and disposed in the magnetic gap, the magnetic circuit unit or the diaphragm being vibrated by applying an alternating current to the coil attached to the diaphragm, wherein the suspension is made of a magnetic material, and wherein the suspension is disposed on the magnetic yoke of the magnetic circuit unit wherein the inner circumference of the suspension constitutes the outer end of the magnetic gap.