Patent ID: 7835538

Claim:
A loudspeaker comprising: a inversed dome-shaped diaphragm having a recess viewed from a front side, that is made of a base material impregnated in a thermosetting resin; a cone diaphragm whose outer circumference side end portion is coupled with an outer circumference end portion of the dome diaphragm; and a voice coil having a bobbin whose one end is coupled to a back surface of the dome diaphragm, and whose outer curved surface is coupled with an inner circumference end portion of the cone diaphragm, wherein the dome diaphragm is provided with a plurality of cone-shaped projections that is formed by hardening the thermosetting resin, projecting from the back surface, and disposed in a circular pattern with a space between each other, the plurality of cone-shaped projections defining a coupling portion to which the one end of the bobbin is coupled, a height of each of the plurality of cone-shaped projections provided for the dome diaphragm is set greater than a sum of maximum values of absolute values respectively of height tolerance of the dome diaphragm, height tolerance of the cone diaphragm, and height tolerance of the bobbin of the voice coil, and a cone radius defining each cone-shaped projection is set greater than a maximum value of an absolute value of radius tolerance of the bobbin.