Electromagnetic transducer having a low reluctance return path

Details Electromagnetic transducer having a low reluctance return path Electromagnetic transducer having a low reluctance return path

2006-06-20

2006-06-20

Le, Huyen (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S414000, C381S421000

Reexamination Certificate

active

07065225

ABSTRACT:
An electromagnetic transducer, such as an audio speaker, includes a return path member which is a pole piece for external magnet geometries or a cup for internal magnet geometries. The magnetic flux return path for the primary drive magnet is through a first portion of the return path member. A first section of a low reluctance magnetic flux return path for a secondary drive magnet is through a second portion of the return path member. A magnetically conductive plate provides a second section of the low reluctance return path from the second portion of the return path member to the secondary drive magnet.

REFERENCES:
patent: 6671385 (2003-12-01), Suzuki et al.
patent: 6940992 (2005-09-01), Stiles

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