Internal magnetic circuit and loudspeaker system...

Details Internal magnetic circuit and loudspeaker system... Internal magnetic circuit and loudspeaker system...

2006-10-10

2006-10-10

Tran, Sinh (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S412000, C381S420000

Reexamination Certificate

active

07120271

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.

REFERENCES:
patent: 6611606 (2003-08-01), Guenther
patent: 6665414 (2003-12-01), Murayama et al.
patent: 6671385 (2003-12-01), Suzuki et al.
patent: 2002/0044671 (2002-04-01), Shimomura et al.
patent: 2003/0133587 (2003-07-01), Hyre et al.
patent: 6-261393 (1994-09-01), None
patent: 7-170598 (1995-07-01), None

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