| 摘要 |
PURPOSE:To obtain a light weight voice coil having large rigidity and excellent response properties by constituting a coil support plate by laminating a rigid plastic layer containing carbon fibers and an insulating rigid plastic layer. CONSTITUTION:Insulating rigid plastic layers 13, 14 are each laminated on both sides of a rigid plastic layer 12 containing carbon fibers in a coil support plate 10. The insulating rigid plastic layers 13, 14 electrically insulate the rigid plastic layer 12 containing carbon fibers from flat coils 11 because the rigid plastic layer 12 has conductivity. Accordingly, the insulating rigid plastic layer may be interposed only between the rigid plastic layer containing carbon fibers and the flat coil on a voice coil of a type of which the flat coil 11 is arranged only on one side of the coil support plate 10. |
