| 摘要 |
PURPOSE:To reduce half the energy necessary for charging to drive a piezoelectric element from the side of a power source by making common a circuit of said piezoelectric element at the supply side of power and selectively driving said piezoelectric element by a grounding switch. CONSTITUTION:Piezoelectric elements 2-10 are commonly connected at one sides thereof to a controllable power source 1. Moreover, these piezoelectric elements 2-10 are connected at the other sides thereof to output terminals of NPN transistors 11-19 earthed through an emitter. Thus, the piezoelectric elements 2-10 are optionally selected by the terminals 11-19. |
