| 摘要 |
PURPOSE:To drive two sets of independent oscillation system in one set of magnetic circuit and to reproduce good high-frequency sound and good low-frequency sound by constituting the magnetic circuit by providing a diaphragm and a voice coil in the both sides of a magnet respectively. CONSTITUTION:The flux of a magnet 1 returns the magnet 1 through a pole piece 2, an air gap 5, a yoke 4, an air gap 6 and a pole piece 3 and forms the magnetic circuit. When an voice current is conducted to the voice coil 13 of a diaphragm 12 in the gap 5, the diaphragm 12 oscilates corresponding to the voice current and turns it into a sound wave which is transmitted outside through a rear sound hole for high-frequency sound 7. In the same way in an air gap 6 a diaphragm 14 oscilates corresponding to a sound signal current which is conducted to a voice coil 15 and turns it into the sound wave, which is transmitted outside from a sound pass 11 through rear sound holes for low-frequency sound 8 and 8'. In such case braking cloths 18-20 control the flow of air to improve the frequency characteristic of a generated sound.
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