| 摘要 |
PURPOSE:To abruptly displace a bimorph without self-oscillation in an electromechanical converter by superimposing second drive voltage having the same period, amplitude and 180 deg. of phase difference as and from the self-oscillation components in the first drive voltage to the first drive voltage. CONSTITUTION:When predetermined voltage 22 is stepwisely applied to a bimorph, it can respond with a wave 23 of T/2 with self-vibration period T until the initial peak value due to the transient theory. When the Q factor of the bimorph is approx. 10, the excessive amount is approx. 1, and the amplitude sigmat1 is twice the ideal displacement sigmas1. Accordingly, the bimorph is displaced by sigmas1/2 by the pulse 24. The response of the bimorph for the pulse waveform 24 is the synthesized negative and positive stepwise voltage 25 and 26, and the responses to the respective voltage becomes self-oscillation with the period T and the amplitude sigmas1. Therefore, when synthesizing them by taking into consideration with the symbolts, the bimorph responds with the waveform 29. When it is now driven by the synthesized waveform 20 of the pulse 24 and the stepwise voltage 22, the transient response of the bimorph becomes the waveform 31. After the rise time of the T/2 period the displacement sigmas1 becomes constant to abruptly displace without self-oscillation. |
