Microspeaker and method of designing the same

Details Microspeaker and method of designing the same Microspeaker and method of designing the same

2007-07-12

2011-11-01

Booth, Richard A. (Department: 2812)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S421000, C381S422000

Reexamination Certificate

active

08050445

ABSTRACT:
Provided are a microspeaker and a method of designing the same. The microspeaker includes a first permanent magnet and a second permanent magnet disposed on the first permanent magnet with a predetermined gap therebetween, the first and second permanent magnets having opposite magnetization directions; a third permanent magnet and a fourth permanent magnet disposed on the third permanent magnet with a predetermined gap therebetween, the third and fourth permanent magnets being disposed next to the first and second permanent magnets, respectively, with an air gap therebetween; a yoke interposed between the first and second permanent magnets and between the third and fourth permanent magnets; a voice coil inserted into the air gap; and a vibrating diaphragm attached to an end of the voice coil and forming a sound field according to the movement of the voice coil, wherein the first and third permanent magnets have opposite magnetization directions, and the second and fourth permanent magnets have opposite magnetization directions.

REFERENCES:
patent: 6904158 (2005-06-01), Ohashi
patent: 100185946 (1998-12-01), None
patent: 1020010089034 (2001-09-01), None
patent: 1020047083981 (2004-10-01), None
patent: 1020050091444 (2005-09-01), None

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