Electroacoustic transducer

Abstract

An electroacoustic transducer comprising a magnetic circuit of a magnetically conductive material with a pair of opposed surfaces defining a gap therebetween, the magnetic circuit comprising a magnet inducing a magnetic field in the gap, the magnet having a surface constituting one of the opposed surfaces. The magnetic circuit further comprises a diaphragm and a coil having electrically conducting paths secured to the diaphragm. The coil has portions of its paths situated in the gap.

Description

field of invention [0001] The present invention relates to electroacoustic sensors, and more particularly to electrokinetic sensors with a diaphragm with a coil movable in a magnetic field. Background technique [0002] Electroacoustic sensors, especially electrodynamic sensors, are widely used in communication equipment requiring small size, such as wired or mobile phones. Conventional electrodynamic microphone and speaker transducers used eg in mobile phones are rotationally symmetrical and have a disc or ring-shaped permanent magnet which is magnetized in the axial direction of the magnet. A magnetic circuit of magnetized soft iron or other suitable material defines a gap with a radial magnetic field established by the magnet. A diaphragm with a toroidal coil of conductive wire positioned in the gap. [0003] If the inner and outer components defining the gap are not perfectly coaxial, the gap will not have a uniform width, which results in distortion of the magnetic fi...

AI Technical Summary

Problems solved by technology

Coils that are not perfectly centered will cause the same distortion as above

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