Internal magnetic circuit and loudspeaker system incorporating the same

摘要

An internal magnetic circuit is formed by a plate (20) forming a pole piece, a vertically magnetized magnet (21) attached to a bottom face of the plate, and a yoke (22) attached to a bottom face of the magnet. A magnetic gap (G0) is formed between the plate and the yoke. The yoke includes a bottom part (22b) attached to the bottom face of the magnet, a side part (22c) standing on the side of the plate, and a folded-back part(22d) folding downwards over the side part to face the magnetic gap. Thus, the internal magnetic circuit having a uniform magnetic flux density inside the magnetic gap along the direction of its length is provided.