JPS6439198A - Speaker device - Google Patents

Abstract

PURPOSE:To eliminate the need of a stationary magnet and to miniaturize the titled device by providing plural numbers of coils, plural numbers of diaphragms partly constituted of a superconductive material and a damper device to mutually combine the diaphragms. CONSTITUTION:An electroacoustic signal is separated into a low frequency part and a high frequency part according to its frequency component, the low frequency part is supplied to a terminal B and the high frequency part is supplied to terminals A, A' respectively, and converted into a magnetic flux by coils 8, 9 and 10. The generated magnetic flux generates a magnetic flux in the opposite direction to superconductive materials 11, 12 and 13 partly mounted on each diaphragm and diaphragms 1, 2 and 3 arranged in front of coils 8, 9 and 10, its repulsive force is added to the diaphragms 1, 2 and 3. The repulsive force moves each diaphragm until it is canceled by damper devices 5, 6 and 7, and converted into a sound wave as the result. An influence which the vibration of each diaphragm gives to other diaphragms is reduced by combining each diaphragm by each damper device, an acoustic characteristic is improved, a stationary magnet is not necessary, the device can be miniaturized and the unfavorable influence to the outside can be reduced.