Magnetic circuit for speaker, method of manufacture thereof,...

Details Magnetic circuit for speaker, method of manufacture thereof,... Magnetic circuit for speaker, method of manufacture thereof,...

2005-02-22

2005-02-22

Le, Huyen D. (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S408000, C381S431000

Reexamination Certificate

active

06859544

ABSTRACT:
A magnetic circuit for a speaker comprises: a bonded magnet shaped rectangular in top plan view, having on its top face a plurality of grooves formed to extend all the way along two opposing sides thereof and arrayed in parallel with one another at predetermined intervals, and magnetized such that magnetic fluxes at two adjacent grooves are directed inversely to each other; and a plurality of plate-like pole pieces fixedly disposed on the top face of the bonded magnet, and arrayed along the grooves such that two adjacent pole pieces form an air gap located along the center of each groove thereby forming a magnetic gap. And, there is provided a speaker which uses the magnetic circuit thereby achieving a reduced profile.

REFERENCES:
patent: 4544805 (1985-10-01), Sawafuji
patent: 5214404 (1993-05-01), Yamaguchi et al.
patent: 5687248 (1997-11-01), Yen et al.
patent: 0 685 983 A2 (1995-12-01), None
patent: 63-99700 (1988-04-01), None

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