| 摘要 |
<P>PROBLEM TO BE SOLVED: To establish self-oscillation even when resonance frequencies of two oscillators are different greatly. <P>SOLUTION: A signal of only a monitor electrode 3-1 (3-11, 3-12) in the oscillator 1-1 is detected to be fed back to a self-oscillation circuit 10, a driving signal is impressed to a driving electrode 4-11 of the oscillator 1-1 and a driving electrode 4-22 of the oscillator 1-2, and a driving signal in which a phase of an output signal is shifted by 90° is prepared in an inverter 11 in the latter stage of the self-oscillation circuit to be supplies as a voltage signal to a driving electrode 4-12 of the oscillator 1-1 and a driving electrode 4-21 of the oscillator 1-2. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
