| 摘要 |
PURPOSE:To flatten a sound pressure frequency characteristic by providing the plate diaphragm of a triangular form and a coupling cone having one end connected to the upper end part of a voice coil and the other end connected to the lower surface of the plate diaphragm. CONSTITUTION:Since the plate diaphragm 11 of the triangular form is asymmetrical with respect to a center line (j), even when the position 15 of a node generated at the time of driving the plate diaphragm 11 cannot be correctly driven by the coupling cone 16 for driving the plate diaphragm, a phase difference due to the oscillation of the respective surfaces of the diaphragm is different, so that a front room effect can be reduced. Further, the generation of the front room effect can be cancelled by the coupling cone 16 of the triangular cone form capable of driving correctly the position 15 of the node generated at the time of driving the plate diaphragm 11 of the triangular form. Thereby, the sound pressure frequency characteristic can be flattened.
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