MAGNETIC CIRCUIT OF SPEAKER FOR FORMING UNIFORM MAGNETIC FLUX DISTRIBUTION, IN WHICH THE DISTRIBUTION OF THE MAGNETIC FLUX IS FORMED UNIFORMLY

摘要

PURPOSE: A magnetic circuit of a speaker for forming a uniform magnetic flux distribution is provided to uniformly distribute the magnetic flux by increasing the number of edges to which the magnetic flux is concentrated, thereby improving the directionality of the voice coil. CONSTITUTION: A magnetic circuit of a speaker for forming a uniform magnetic flux distribution includes a yoke(1), a magnet(2), a pole piece(100), a frame(4), a voice coil(5), a vibrational plate(6), a damper and a center cap(8). The pole piece(100) is provided with a first pole piece(110), an aluminum thin film(120) and a second pole piece(130). The first pole piece(110)'s shape is circular disk and attached to the top surface of the magnet(2). The aluminum thin film(120) is made of a material having a permeability smaller than that of the first pole piece(110) and attached to the top surface of the first pole piece(110). And, the second pole piece(130) is the same shape and material of the first pole piece(110) and attached to the top surface of the aluminum thin film(120).