| 摘要 |
<p>A ribbon-type electro-acoustic transducer has a magnet system which comprises an upper plate (2, 3) and a centre pole (1) between which an air gap (8) is formed. A diaphragm (7) on which conductors (9) are arranged, is disposed in the air gap. The upper plate (2, 3) comprises two plate-shaped parts (2', 3' and 2", 3" respectively) between which a space (11) is formed in which an edge portion of the diaphragm is located. This results in a more homogeneous magnetic field, so that the transducer distortion may be reduced. Moreover, the transducer sensitivity is improved and is suitable for handling signals in the mid-range audio frequency spectrum. The cavity (15) enclosed by the magnet system and the diaphragm (7) can be acoustically coupled, as the case may be via an additional cavity, to a (bass-reflex) duct or an additional (passive radiator) diaphragm.</p> |
