Speaker and mobile terminal device

Details Speaker and mobile terminal device Speaker and mobile terminal device

2006-09-12

2006-09-12

Ni, Suhan (Department: 2615)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S182000, C381S421000

Reexamination Certificate

active

07106878

ABSTRACT:
A speaker includes a first magnet; a second magnet provided so as to surround the first magnet; a yoke for connecting the first magnet and the second magnet; a first voice coil; a second voice coil; a first diaphragm connected to the first voice coil; a second diaphragm oppositely provided to the first diaphragm with respect to the first magnet and connected to the second voice coil; a first magnetic plate provided between the first diaphragm and the first magnet; and a second magnetic plate provided between the second diaphragm and the first magnet. The first voice coil is provided in a first magnetic gap between the first magnetic plate and the yoke. The second voice coil is provided in a second magnetic gap between the second magnetic plate and the yoke.

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Japanese Office Action dated Jun. 29, 2005.
Communication and Search Report from European Patent Office (4 pages) Dated Aug. 4, 2003.

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