Patent ID: 7929725
Filing Date: 2011-04-19
Classification: H04M,H04R

Abstract:
1. An acoustic apparatus comprising: a first magnet plate which is placed at the front of a diaphragm, has north poles and south poles magnetized alternately in a stripe-like fashion, and has a plurality of holes formed; a second magnet plate which is placed at the back of the diaphragm, has north poles and south poles magnetized alternately in a stripe-like fashion in a manner as to align with the poles of said first magnet plate, and has a plurality of holes formed; a conductor circuit which is wired on said diaphragm and along the stripe-like poles on said first and second magnet plates; a first iron plate which is placed at the front of said first magnet plate, and has a plurality of holes formed; a second iron plate which is placed at the back of said second magnet plate, and has a plurality of holes formed; and a microphone which is located equidistant from a surface of said first iron plate and a surface of said second iron plate.