Patent ID: 8116510
Filing Date: 2012-02-14
Classification: H04R

Abstract:
1. A loudspeaker comprising: a disc-like magnet having an upper surface a lower surface, and a side surface extending between said upper surface of said magnet and said lower surface of said magnet; a plate having an upper face and a lower face, said lower face being disposed in contact with said upper surface of the magnet; a yoke having an upper surface bonded to said lower surface of said magnet, said yoke further including a bottom part, a first side surface extending downardly from said upper surface of said yoke to said bottom part of said yoke, and an upwardly-extending part extending upwardly from said bottom part and including a second side surface, said second side surface of said yoke facing said first side surface of said yoke and said side surface of said magnet across a first gap portion constituting part of a magnetic gap; a voice coil inserted into the magnetic gap; and a diaphragm interlocked with the voice coil; wherein the plate includes a lower part that includes said lower face of said plate and has a diameter identical to that of the magnet, and an upper part that includes said upper face of said plate and has a diameter larger than that of the magnet; wherein the plate has a side surface that includes an upper side surface part extending downwardly from said upper face of the plate and constituting a side surface of said upper part of the plate, and that includes a lower side surface part extending upwardly from the lower face of the plate and constituting a side surface of said lower part of the plate; and wherein the lower side surface part of the plate faces said second surface of said yoke across a second gap portion constituting part of the magnetic gap, and the upper side surface part of the plate faces said second side surface of said yoke across a third gap portion constituting part of the magnetic gap; and wherein the third gap portion is narrower than the first and second gap portions.