Internal magnetic circuit and loudspeaker system incorporating the same
AssigneesPioneer Corporation, Tohoku Pioneer Corporation
InventorsHiroyuki Kobayashi, Hiroyuki Dohi, Shouichiro Terauchi, Takashi Ohyaba
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Abstract
An internal magnetic circuit is formed by a plate forming a pole piece, a vertically magnetized magnet attached to a bottom face of the plate, and a yoke attached to a bottom face of the magnet. A magnetic gap is formed between the plate and the yoke. The yoke includes a bottom part attached to the bottom face of the magnet, a side part standing on the side of the plate, and a folded-back part 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.
Claims7
An internal magnetic circuit comprising:
- a magnet;
- a plate arranged on one magnetic pole of said magnet;
- a yoke arranged on the other magnetic pole of said magnet, said yoke comprising a bottom part attached to a bottom face of said magnet and a side part surrounding said magnet and said plate;
- and
- a magnetic gap being formed between said side part of said yoke and said plate,
- wherein shorter magnetic flux loops crossing said magnetic gap near said magnet are evenly dispersed by elongating a magnetic path length of the shorter magnetic flux loops, thereby a magnetic flux density in said magnetic gap is made uniform.
An internal magnetic circuit comprising:
- a magnet;
- a yoke arranged on one magnetic pole of said magnet;
- a plate arranged on the other magnetic pole of said magnet;
- and
- a magnetic gap being formed between said yoke and said plate,
- wherein a magnetic flux density inside said magnetic gap is made uniform by elongating a magnetic path length of magnetic flux crossing said magnetic gap near said magnet, and
- said yoke includes a bottom part attached to a bottom face of said magnet, a side part standing on a side of said plate, and a folded-back part folding downward over said side part such as to face said magnetic gap.
Dependencies are inferred from the claim text.