| 摘要 |
PURPOSE:To expand a reproduction zone of a loudspeaker, by driving two tangential lines and at least one tangential line among n1-n4, which are generated in parallel on a short side of a rectangular flat diaphragm, by a magnetic driving mechanism, respectively. CONSTITUTION:A coil bobbin 8 in fixed to a tangential line m1 part in a vibration mode M which is generated by frequency f1 when the center part of a rectangular flat diaphragm 6 is driven, and the other coil bobbin 8' is fixed to a tangential line n1 part in a vibration mode N which is generated by frequency f2 when the center part of a rectangular flat diaphragm 6 is driven. In this way, in case when the tangential line part generated in the frequency f1 and the tangential line part generated in the frequency f2 are driven, respectively, disorder of acoustic pressure in an acoustic pressure frequency characteristic can be suppressed to an extent which is out of question practically, and the reproduction zone can be expanded to resonance frequency fH of a higher order. |
