Patent ID: 6771792
Filing Date: 2004-08-03
Classification: H04R

Abstract:
An elongated oval track-shaped loudspeaker wherein a voice coil wound on a bobbin is disposed in a magnetic gap between a pole piece and a plate on a magnet disposed around the pole piece, an elongated oval track-shaped diaphragm is joined to the voice coil bobbin supported through a damper to a frame, the pole piece is track-shaped to elongate along major axis of the track-shaped diaphragm, the voice coil bobbin in the gap as well as the magnet disposed around the pole piece are track-shaped, the damper supporting the voice coil bobbin is track-shaped at inner and outer peripheries, and a cross sectional area of the track-shaped pole piece is made to be equal to that of a circle of a diameter more than &frac13; of a minor axis side length of the loudspeaker so that no magnetic saturation will occur even with the magnet made larger and a magnetic efficiency can be elevated.