Patent ID: 7634102

Claim:
A loudspeaker comprising: a magnetic circuit having a magnetic gap; a frame coupled to the magnetic circuit; a voice coil having a first end positioned in the magnetic gap and a second end opposite to the first end, the voice coil having a center axis provided through the first end and the second end; and a diaphragm coupled to the second end of the voice coil and the frame, the diaphragm having a first portion in which the center axis of the voice coil is provided, the first portion of the diaphragm being provided inside the voice coil, the diaphragm further having a second portion outside the voice coil, wherein one of the first portion and the second portion of the diaphragm has a cross section in a plane along which the center axis extends, and the cross section of the one of the first portion and the second portion of the diaphragm is shaped as an arc of a non-circular ellipse.