| 摘要 |
<p>The loudspeaker consists of a membrane of strong paper, or very thin leather, stuck to a central part in expanded polystyrene and to the periphery of the loudspeaker body, made of polycarbonate, aluminium or polyamide. The central part is stuck to a movable paper coil which oscillates between the double magnetic circuit generated by the two magnets situated concentrically, and their respective pole pieces.</p> |
