| 摘要 |
PURPOSE:To make a body miniature and thin by arranging a permanent magnet on the same plane as a voice coil. CONSTITUTION:Voice coil 8, wound around voice-coil receptacle 7, is arranged in the gap between cylindrical yoke 4 and permanent magnet 9. Permanent magnets 9 and cylindrical yoke 4 are arranged on the same plane as voice coil 8. Permanent magnet 9 consists of a fan-shaped unit magnet with identical polarity at its internal circumference and opposite oplarity at its external circumference. |
