Patent ID: 7576462

Claim:
An electromagnetic exciter comprising: a cylindrical casing having a first end opening and a second end opening; a diaphragm closing the first end opening of the cylindrical casing; a magnetic circuit assembly disposed inside the cylindrical casing for vibration in an axial direction of the cylindrical casing, the magnetic circuit assembly comprising a yoke, a permanent magnet disposed on the yoke, and a voice coil attached to the diaphragm, the magnetic circuit assembly cooperating with the voice coil to convert an electrical signal into an acoustic vibration, the magnetic circuit assembly configured to vibrate relative to the cylindrical casing; and a suspension formed in one piece of component including the cylindrical casing and comprising an outer ring portion integrally formed at the second end opening of the cylindrical casing, an inner portion inside the outer ring portion and at least one arcuate connection configured to elastically connect the outer ring portion and the inner portion, the inner portion being situated at an axial distance from the outer ring portion inside the cylindrical casing, and the inner portion elastically supporting the magnetic circuit assembly inside the cylindrical casing.