Electromagnetic transducer and portable communication device

Details Electromagnetic transducer and portable communication device Electromagnetic transducer and portable communication device

2005-07-19

2005-07-19

Kuntz, Curtis (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S431000, C381S412000, C381S414000, C381S429000, C181S163000, C181S164000, C181S168000

Reexamination Certificate

active

06920230

ABSTRACT:
An electromagnetic transducer includes: a first diaphragm; a second diaphragm provided in a central portion of the first diaphragm, the second diaphragm comprising a magnetic material having a first opening in a central portion thereof; a yoke disposed so as to oppose the first diaphragm; a center pole disposed between the yoke and the first diaphragm, wherein the center pole has a shape which allows insertion into the first opening; a coil disposed so as to surround the center pole; and a first magnet disposed so as to surround the coil.

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