Speaker apparatus

Details Speaker apparatus Speaker apparatus

1997-02-14

1998-11-10

Le, Huyen

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

381414, 381412, H04R 2500

Patent

active

058356126

ABSTRACT:
A speaker apparatus includes a yoke formed of a magnetic material and having a flange portion and a center pole protruded integrally forwards from a mid portion of the flange portion, and a ring-shaped driving magnet into which the center pole is inserted. The speaker apparatus also includes a top plate mounted on the driving magnet. The top plate is formed of a magnetic material and the center pole is inserted through the top plate. The top plate defines a magnetic gap together with the center pole. The speaker apparatus further includes a voice coil mounted on a bobbin secured to a diaphragm in the magnetic gap, and a canceling magnet arranged on the outer periphery of and spaced from the driving magnet at a pre-set spacing for covering the driving magnet. The canceling magnet cancels the magnetic flux leaking to outside a magnetic circuit including the driving magnet.

REFERENCES:
patent: 3129298 (1964-04-01), Hofman
patent: 5452366 (1995-09-01), Sakamoto
patent: 5536984 (1996-07-01), Stuart et al.

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