| 摘要 |
PROBLEM TO BE SOLVED: To realize a voltage controlled piezoelectric oscillator that is driven at a low voltage with a wide frequency variable range. SOLUTION: The composite vibrator consists of a piezoelectric substrate on which 1st and 2nd electrodes with different electrode areas are arranged and the other substrate on which a 3rd electrode is arranged and a relation of f1-f2≈f2-f3 and t1-t2≈t2-t3 is satisfied, where t1, t2, t3 are respective top temperatures of the vibrator configured with the 1st, 2nd and 3rd electrodes and f1, f2, f3 are frequencies at the respective temperatures.
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