| 摘要 |
PURPOSE:To obtain a diaphragm with high fidelity and excellent in sound quality by vibrating a vibrating element while using plural flexible sealing members such as magnetic fluids against a deflection torque of the vibrating element to support the vibrating element in isolating. CONSTITUTION:A diaphragm 2 is provided at the center of a bobbin 1, voice coils 3, 3' are wound at both ends of the bobbin 1 and they are incorporated so as to form the vibrating element. Then the voice coil 3 is placed between magnetic poles of a center pole 7 of a magnetic circuit 6 having a magnet 5 and a yoke 8 and the magnetic fluid 9 is placed so as to bury the part among the voice coil 3, the center pole 7 and the yoke 8. The magnetic fluid 9 is kept between the magnetic poles by a magnetic force and the distance between the vibrating element and the voice coil 3, the center pole 7, the yoke 8 is kept constant by the self-centering effect of the magnetic fluid. |
