| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving device capable of constantly driving a movable body at high speed at driving voltage of an optimum frequency even when the resonance frequency of an electromechanical transducing element is varied due to fluctuation in ambient temperature, variation in shape in mass production, or the like. <P>SOLUTION: A self-oscillation circuit includes: multiple electromechanical transducing elements 42 and 44 connected in parallel; a current detector circuit 52 that detects as voltage the currents passed through the electromechanical transducing elements 42 and 44; an offset circuit 54 that applies offset voltage to output voltage from the current detector circuit 52; and an amplifier circuit 56 that amplifies output voltage from the offset circuit 54 and applies it to the electromechanical transducing elements. The self-oscillation circuit oscillates at the primary resonance frequency of a vibration system including at least the electromechanical transducing elements 42 and 44. The driving device is driven with this self-oscillation circuit. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
