| 摘要 |
<p>Three different types of loudspeakers are constituted by combining of a plate in form of circular, polygon or rectangle and a plate in form of inter concave corresponding to said plate; a said inter concave plate and a plate corresponding to said inter concave plate; and two said inter concave plates and a thin slice of rare-earth permanent magnetism arranged in periphery of pole piece. A disclosed method for manufacturing the said loudspeakers which inserts the thin slice of pre-polarized rare-earth permanent magnetism into the plate gap between upper magnetic yoke and lower magnetic yoke hollow frame adhered to the space in form of inter concave. The magnetic field density of loudspeaker's magnetic gap can be adjusted manually.</p> |
