Patent ID: 8553926

Claim:
A speaker, comprising: a diaphragm formed as an elongated box-shape having a five face body and one open face disposed opposite an upper face of the five face body; at least one damper, connected to the upper face opposed to the open face of the diaphragm, for supporting the diaphragm so as to enable vibration of the diaphragm; a flange provided on four side faces of the diaphragm, the four side faces being adjacent to the open face of the diaphragm; an edge joined to the flange so as to form a projection portion on the flange; a voice coil wound around the four side faces which are among the five faces of the diaphragm and which are adjacent to the open face, the voice coil being fixed to the diaphragm and the flange and disposed on an opposite end of the diaphragm with respect to the at least one damper; a plurality of reinforcing ribs formed, in a configuration where the upper face and two side faces of the diaphragm define a long side direction of the diaphragm, on the diaphragm as continuous recessed and projecting shapes which are formed on the upper face and the two side faces of the diaphragm; and a magnetic circuit for supplying a drive force to the voice coil, wherein the diaphragm is configured such that a height from the open face to the upper face opposed to the open face is greater than or equal to twice a thickness of the voice coil, and a length of a long side of the upper face is greater than or equal to twice a length of a short side of the upper face.