Patent ID: 8649549

Claim:
A speaker comprising: a magnetic circuit defining a magnetic gap; a vibrating device having a voice coil and a diaphragm, the voice coil being partially received in the magnetic gap; the voice coil comprising: a first main member; a second main member being parallel to the first main member; a first linking member connecting two ends of the first and the second main members at a first side; a second linking member connecting two ends of the first and the second main members at a second side opposed to the first side; a closed loop formed by the first main member, the second main member, the first linking member and the second linking member; wherein the first linking member includes: a first arc connecting to the first main body, the first arc being a part of a first circle having a first curvature radius; a second arc connecting to the second main body, the second arc being a part of a second circle having a second curvature radius; and a third arc located between the first arc and the second arc, the third arc being a part of a third circle having a third curvature radius greater than each of the first and second curvature radiuses.