Patent ID: 7272238

Claim:
A loudspeaker, comprising: a speaker frame; a diaphragm connected to the speaker frame in a manner capable of vibration; a voice coil connected to the diaphragm for vibrating the diaphragm; a magnetic assembly including a permanent magnet for creating a magnetic circuit for interaction with the voice coil; a pole piece disposed at a central opening of the magnetic assembly to form an air gap in the magnetic circuit with the magnetic assembly into which the voice coil is movably provided; a shorting ring mounted on an outer surface of the pole piece; and a heat dissipation plate mounted on the pole piece at an inner opening thereof and connected to the shorting ring; wherein the heat dissipation plate and the shorting ring are made of non-magnetic and thermally conductive material, and wherein an inner surface of the shorting ring and the outer surface of the pole piece contact with one another.