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Title:
ELECTROMAGNETIC ELECTROACOUSTIC TRANSDUCER
Document Type and Number:
Japanese Patent JPS5859699
Kind Code:
A
Abstract:

PURPOSE: To realize a low resonance frequency and a high efficiency, by reducing the diameter without damaging the elasticity of the diaphragm and holding the magnetic coupling strong.

CONSTITUTION: An electromagnetic electroacoustic transducer consists of a pot-shaped yoke 10 consisting of a magnetic material, a diaphragm 11 which has the circumference supported by the upper end part of this yoke 10 consisting of an elastic material, a cylindrical or prism-shaped movable permanent magnet 13 which is fixed to the about center of the diaphragm 11 to form a slight gap 12 between the magnet 13 itself and the bottom face of the yoke 10, and a doughnut-shaped exciting coil 15 which is fixed in the yoke 10 while keeping a proper gap 14 around the movable permanent magnet 13. Thus, since the permanent magnet 13 having a small diameter is fixed to the diaphragm 11, the elastic part of the diaphragm 11 is kept wide, and the rise of the resonance frequency is suppressed.


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Inventors:
ENOMOTO MITSUTAKA
Application Number:
JP1981000157740
Publication Date:
April 08, 1983
Filing Date:
October 03, 1981
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G10K9/13; H04R11/00; H04R13/00; (IPC1-7): G10K9/13; H04R13/00
Domestic Patent References:
JPS54133895A1979-10-17
JPS5377491A1978-07-08