公开(公告)号：EP1377117A1

公开(公告)日：2004-01-02

申请号：EP03013872.1

申请日：2003-06-18

申请人： Pioneer Corporation ,  TOHOKU PIONEER ELECTRONIC CORPORATION

发明人： Kobayashi, Hiroyuki ,  Dohi, Hiroyuki ,  Terauchi, Shouichiro ,  Ohyaba, Takashi

IPC分类号： H04R9/02 ,  H04R9/06

CPC分类号： H04R9/025 ,  H04R9/06

摘要： An internal magnetic circuit is formed by a plate (20) forming a pole piece, a vertically magnetized magnet (21) attached to a bottom face of the plate, and a yoke (22) attached to a bottom face of the magnet. A magnetic gap (G 0 ) is formed between the plate and the yoke. The yoke includes a bottom part (22b) attached to the bottom face of the magnet, a side part (22c) standing on the side of the plate, and a folded-back part(22d) folding downwards over the side part to face the magnetic gap. Thus, the internal magnetic circuit having a uniform magnetic flux density inside the magnetic gap along the direction of its length is provided.

摘要翻译： 内部磁路由形成极片的板（20），安装在板的底面上的垂直磁铁（21）和安装在磁铁底面上的磁轭（22）形成。 在板和轭之间形成磁隙（G0）。 磁轭包括安装在磁体的底面上的底部（22b），站在板的侧面上的侧部（22c）和折叠部分（22d），折叠部分（22d）在侧面部分上向下折叠以面对 磁隙。 因此，提供沿着其长度方向在磁隙内部具有均匀磁通密度的内部磁路。