Electromagnetic transducer and portable communication device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsSawako Usuki, Shuji Saiki
Life of this patent
Estimating the term…
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.
Claims44
An electromagnetic transducer comprising:
- a first diaphragm;
- a second diaphragm provided in a central portion of the first diaphragm, the second diaphragm comprising a magnetic material having an 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 opening;
- a coil disposed so as to surround the center pole;
- and
- a first magnet disposed so as to surround the coil.
A portable communication device comprising an electromagnetic transducer comprising:
- a first diaphragm;
- a second diaphram provided in a central portion of the first diaphragm, the second diaphragm comprising a magnetic material having an opening in a central portion thereof;
- a yoke disposed so as to oppose the first diaphram;
- a center pole disposed between the yoke and the first diaphram, wherein the center pole has a shape which allows insertion into the opening;
- a coil disposed so as to surround the center pole;
- and
- a first magnet disposed so as to surround the coil.
Dependencies are inferred from the claim text.