Patent ID: 6810128
Filing Date: 2004-10-26
Classification: B06B,H04M,H04R

Abstract:
An electromagnetic induction actuator with a round housing that encloses a diaphragm that transmits vibrations;a magnetic circuit that consists of a voice coil mounted on the inner surface of the diaphragm, a magnet for the magnetic circuit, a yoke that surrounds and supports the magnet, and a pole piece; and at least one thin spring that supports the magnetic circuit; the components being assembled with the springs fitted into the inner surface of the housing supporting the magnetic circuit, including the magnet, with the diaphragm fitted into an opening in the housing, and with a voice coil positioned close to the magnetic circuit; there being a number of tabs that act as shock resistance stoppers located at equal intervals around the outer rim of the yoke extending toward the inner surface of the wall of the housing; and a spring that has an inner ring that fits the outer periphery of the yoke, an outer ring that fits the inner diameter of the housing, bridge arms that are spaced at equal distances around the circumference of the two rings and that connect the inner and outer rings, and recesses that are spaced at the same intervals as the bridge arms and that correspond to the positions of the tabs on the yoke; the yoke and spring together being assembled within the housing by positioning the tabs of the yoke in the recesses of the spring with the outer periphery of the yoke fitted into the inner diameter of the spring, and the outer ring of the spring fitted into the inner diameter of the housing.