| 摘要 |
An improved self-cooling loudspeaker of the electrodynamic type, formed by a magnetic circuit includes a cylindrical permanent magnet (1) and two polar parts (2 and 3), namely a cylindrical “core ring” (2) positioned on the permanent magnet (1) and a “return vessel” (3) having a circular plan view, on which the permanent magnet (1) is placed. The “core ring” (2) includes a plurality of helical grooves (4) on the outer cylindrical face thereof, while the “return vessel” (3) also includes a plurality of helical grooves (5) on the upper part of the inner cylindrical face thereof, matching the grooving (4) of the “core ring” (2).
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