| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly efficient speaker unit which comprises a cone paper whose outer peripheral form is slender and whose center part is dented more than its outer peripheral part to have a hole formed, a frame whose outer peripheral part has the outer peripheral part of the cone paper attached to it and whose center part has a bottom dented in the same direction as the cone paper, a magnetic circuit provided on the bottom of the frame, a voice coil made of a cylindrical bobbin and a coil wound around the outer peripheral surface of the bobbin which has the bobbin connected to the cone paper while the coil is supported by the magnetic gap of the magnetic circuit, and which vibrates the cone by running a current in the coil. <P>SOLUTION: A yoke 13 of a magnetic circuit 11 has a cylindrical standing wall part 19 whose thickness of the longer direction is thinner than that of the shorter direction, and a hole 1a of a cone paper 1 and a voice coil 35 are connected with a coupling 41 between them. <P>COPYRIGHT: (C)2012,JPO&INPIT |
