| 摘要 |
PROBLEM TO BE SOLVED: To enhance the sound radiation of a small speaker through the use of a single speaker, to expand low band sound pressure and the radiation of the low band and also to prevent a light weight speaker box from being vibrated by constituting a speaker device so that the reaction force of the sound radiation force of a diaphragm is supported by means of air which passes through a duct. SOLUTION: An acoustic signal is supplied to an input terminal 29. Then a diaphragm 7 is driven in a direction indicated by an arrow F1, and the reaction force -F1 is applied to the diaphragm 7 by the sound radiation force of F1. In the meantime, a high sound diffusing body 24 is fixed on a center pole 3a so that a duct radiation force F2 in the opposite direction of the force F1 of the diaphragm 7 is applied by inertia to stop the board 7. The opposite direction action force F2 is regarded as the action force which is excited by the reaction force -F1 of the action force F1 of the diaphragm 7. Therefore, the reaction force -F1 with respect to the sound reflection force F1 of the diaphragm 7 and the reaction force -F2 with respect to the action force F2 acting on the duct of the high sound diffusing body 24 are mutually cancelled or attenuated.
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