Patent ID: 6480614
Filing Date: 2002-11-12
Classification: H04R

Abstract:
A flat acoustic converting device comprising:a first magnet in which a first magnetic pole surface of said first magnet is disposed so as to be substantially in parallel with a predetermined face; a second magnet which is disposed so as to be spaced apart from said first magnet at a predetermined distance and so as to be adjacent to said first magnet so that a second magnetic pole surface of the second magnet whose polarity is different from the polarity of said first magnetic pole surface is substantially in parallel with said predetermined face and faces the same side as the first magnetic pole surface of said first magnet; a vibrating diaphragm which is disposed so as to face said predetermined face; a first coil which is formed in a swirled shape, and which is disposed on said vibrating diaphragm at a position where the internal peripheral portion of the swirl is situated at an area adjacent to and including a position corresponding to the external edge of said first magnetic pole surface; and a second coil which is formed in a swirled shape, and which is disposed on said vibrating diaphragm at a position where the internal peripheral portion of the swirl is situated at an area adjacent to and including a position corresponding to the external edge of said second magnetic pole surface, wherein a current that is supplied into a portion of said first coil which is adjacent to said second coil and a current that is supplied into a portion of said second coil which is adjacent to said first coil are in the same direction.