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Title:
ELECTROACOUSTIC TRANSDUCER
Document Type and Number:
Japanese Patent JP2008118217
Kind Code:
A
Abstract:

To provide an electroacoustic transducer capable of obtaining sufficient sound pressure, even when it is made compact/thin.

An electroacoustic transducer includes a diaphragm 3, having a periphery as a fixed end, a coil 4 having an axis perpendicular to the diaphragm 3 and attached centrally to the diaphragm 3, and a direct current magnetic field generator fixed in position as spaced apart from the coil 4 by a gap provided axially of the coil 4. The diaphragm 3 is driven by applying to the coil 4 a magnetic flux, emitted from a surface of the direct current magnetic field generator that faces the coil 4. The direct current magnetic field generator includes a ring-shaped outer magnet 5, located coaxially with the axis of the coil 4 and magnetized in a direction parallel to the axis, and an inner core 6 including a ferromagnet and located in the center hole of the outer magnet 5.


Inventors:
HATANAKA ARINORI
KOSUDA KAZUYUKI
Application Number:
JP2006297136A
Publication Date:
May 22, 2008
Filing Date:
October 31, 2006
Export Citation:
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Assignee:
SANYO ELECTRIC CO
International Classes:
H04R9/00; H04R9/04
Domestic Patent References:
JPS61216599A1986-09-26
JPS5743689A1982-03-11
JPH01122691A1989-05-15
JP2005286984A2005-10-13
JP2006173997A2006-06-29
JP2004072647A2004-03-04
JPS5746394A1982-03-16
JP2003169393A2003-06-13
JP2003125486A2003-04-25
JPH09331596A1997-12-22
Attorney, Agent or Firm:
Nobuyasu Nishioka
Yoshiko Sugioka