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US 7,031,489 B2Granted
Magnetic circuit for speaker with short-circuiting ring
AssigneeMinebea Co., Ltd.
InventorKenta Amino
Life of this patent
Estimating the term…
Abstract
A magnetic circuit for a speaker comprises: a bottom yoke including a center pole; a ring magnet; a top plate; and a short-circuiting ring shaped like a hollow cylinder. The short-circuiting ring is disposed close and parallel to a voice coil and attached to the inner portion of the bottom of the top plate.
Claims4
A magnetic circuit for a speaker, the circuit comprising:
- a bottom yoke having a center pole;
- a ring magnet;
- a top plate;
- and
- a short-circuiting ring having a cylindrical shape, the short-circuiting ring being disposed close and parallel to a voice coil and fitted into grooves located at an inner portion of a bottom face of the top plate and a cylindrical depression of the bottom yoke with an inner surface of the short-circuiting ring and an inner surface of the top plate lying in the same plane or substantially in the same plane.
2 more elements
A magnetic circuit for a speaker, the circuit comprising:
- a bottom yoke having a center pole;
- a ring magnet;
- a top plate;
- and
- a short-circuiting ring having a cylindrical shape, the short-circuiting ring being disposed close and parallel to a voice coil and attached to an inner portion of a bottom face of the top plate with an inner surfaces of the short-circuiting ring and an inner surface of the top plate lying in the same plane or substantially in the same plane, wherein the short-circuiting ring fits into grooves located at the bottom face of the top plate and the top face of the bottom yoke.
2 more elements
Dependencies are inferred from the claim text.