| 摘要 |
PURPOSE:To realize a loudspeaker having a high radiation property and input- resistance, by forming an edge body and coil bobbin in one body with metals and coupling the edge body to a plate through a metallic spacer. CONSTITUTION:A coil bobbin, around which a voice coil 22 is wound, and edge body 23 are formed in one body with metals having high thermal conductivity by a press work. The edge body 23 is composed of an annular flat part 23a and curved part 23b and a dome-shaped diaphragm 25 is fixed to its small inclined part 24 with an adhesive 26. The flat part 23a of the edge body 23 is fixed to the upper plate 30 of a magnetic circuit 31 composed of an annular permanent magnet 29, an upper plate 30, and a pole piece 27 by means of a metallic lower spacer 32 and an upper spacer 33, so that the voice coil 22 can be arranged to a prescribed position of the magnetic gap. |
