Patent ID: 8270660

Claim:
A speaker device, comprising: a recess-shaped frame supporting, through an edge, a vibration system member provided with a diaphragm coupled to a voice-coil bobbin; and a magnetic circuit including an approximately ring-shaped magnet and an approximately ring-shaped plate which are mounted on a yoke disposed in said frame, and a magnetic gap in which a voice coil wound on said voice-coil bobbin is disposed, wherein said magnetic circuit has a through hole, which extends in a vibration direction of said diaphragm, said frame has a protrusion of a shape protruding from a bottom of said frame in a direction of sound emission through an inside of said through hole, and an air passage is formed between said protrusion and said magnetic circuit; and wherein an outer diameter of said air passage is formed to gradually decrease in size from the bottom of said frame in the direction of said sound emission.