Patent ID: 7715585

Claim:
A speaker wherein a circular outer magnet type magnetic circuit, a circular voice coil which is driven by said magnetic circuit, and a diaphragm to which said voice coil is fixed are held on a rectangular frame said circular outer magnet type magnetic circuit is configured by: a yoke in which a rectangular flange is disposed in one end of a circular center pole; a plate-like magnet which has a circular center hole, which is placed with forming a circular annular gap around said yoke center pole, and which has a rectangular outer shape that is substantially identical with an outer shape of said yoke flange; a circular annular pole piece which is substantially equal in inner diameter to said magnet center hole, in which an outer diameter is substantially equal to short side dimensions of said yoke flange and said magnet, and which cooperates with said yoke flange to clampingly hold said magnet; and a circular magnetic gap into which said circular voice coil is fitted is formed between an outer peripheral face of said yoke center pole of said magnetic circuit and an inner peripheral face of said pole piece, wherein: conductive terminals for supplying an audio signal to said voice coil are integrally attached to respective longitudinal end portions of said frame by insert molding; said terminals protrude in an elastically displaceable manner from said frame in said longitudinal end portions in one surface of said frame opposite to said face to which said diaphragm is attached, and external connecting portions are formed in end portions of said terminals, respectively; and said diaphragm has an oval frame plate in an edge portion, and is joined by said frame plate to an edge portion of said face of said frame to which said diaphragm is attached, and a tip end portion of said voice coil in which one end is fixed to a middle area of said diaphragm is fitted into said magnetic gap.