FLAT ACOUSTIC TRANSDUCER

摘要

A yoke (20) includes flat, rectangular permanent magnets (m18, m28, m38) arranged with the opposite polarity pole faces alternated. A diaphragm (26) includes pairs of spiral coils (L18, L28, L38) arranged on both sides thereof in positions corresponding to those of the permanent magnets. The outline of each of coils is similar to that of the corresponding permanent magnet. The magnetic flux in parallel with the surface of the diaphragm is interlinked with each of the coils, and the force exerted on the current of each coil from the magnetic field is perpendicular to the vibratory face. Therfore the force along the vibratory face is significantly weakened, the noise is reduced, and the quality of sound is improved.