JPS56165499A - Electrostatic electroacoustic transducer - Google Patents

Abstract

PURPOSE:To ensure an assuered elimination of a distortion caused by an asymmetric action without increasing the number of component parts, by dividing a moving electrode at least into two parts to give a partial vibration to these parts in an adverse phase relation and securing an acoustic connection for the vibrating waves given from those two parts. CONSTITUTION:An electret 23 electrified to a negative pole (-) is coated over a left half of the two parts divided by a center spacer 22 which functions as the electrode extracting part of a moving electrode 27 or the center separation zone on a rear electrode plate 21 containing a number of linking small holes H. While an electret 24 electrified to a positive pole (+) is coated over a right half to form a fixed electrode 25. The electrode 27 is provided on the electrode 25, and an air chamber 29 is formed to the electrode 27 by a cylindrical case 28 with bottom. Then a signal source E is connected between the electrodes 25 and 27. Thus the electrode 27 has vibrations in an adverse phase relation between the left half and the right half, and these parts are connected acoustically with the chamber 29. As a result, an output sound pressure wave is obtained with no distortion.