| 摘要 |
PURPOSE:To prevent a speaker unit from being vibrated by the reaction of a vibration system, and to prevent the generation of the unnecessary vibration of a buffle plate or the like, on which the speaker unit is installed by installing an electric vibration transducer to vibrate the speaker unit in a reverse direction, on the speaker unit vibrated by the vibrating reaction of a vibrating diaphragm. CONSTITUTION:One end of a machine screw 10 is screwed at the center of the backside of the yoke 3 of the speaker unit A, and the electric vibration transducer B is installed at the other end of the machine screw 10. When an electric signal is energized to the voice coil 9 of the speaker unit A, the voice coil 9 vibrates in a left and right direction at a figure, and it drives the cone type vibrating diaphragm 7, and an acoustic reproduction is realized. At this time, when the same electric signal is impressed to a driving coil 18 in the transducer B as well, the driving coil 18 too vibrates in the left and right direction at the figure, and drives a weight 20 in the same direction. Here, if the inertial masses of the vibration system in the speaker unit A including the vibrating diaphragm 7, etc., and of the vibration system in the transducer B including the weight 20, etc., are approximately equal, the reaction which the speaker unit A receives by the driving of the vibrating diaphragm 7, is cancelled by the transducer B.
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