| 摘要 |
<p>PURPOSE:To suppress temperature rise efficiently, by supplying a current according to the change in an input signal to an electronic cooling element provided near a voice coil and supplying the input signal to the voice coil with a delay. CONSTITUTION:A audio input signal from an input terminal 14 is supplied to an electronic cooling element 8 provided near a voice coil via a rectifying circuit 16 and integration circuit 17. On the other hand, the audio input signal from the terminal 14 is delayed for a prescribed time at a delay circuit 19, and it is supplied to the voice coil 3 via an output amplifying circuit 15. Thus, the audio current flowing to the coil 3 is increased, and when the heat of the coil 3 is increased, a DC current flowing to the cooling element 8 is greated before and the heat absorbing operation of the cooling element 8 is increased. Thus, the temperature rise based on the voice coil can be suppressed efficiently.</p> |
