| 摘要 |
PROBLEM TO BE SOLVED: To provide stable oscillation with high Q and less spurious by using single crystal whose crystal orientation of lithium niobate is specified rotary Y cut and whose transmission direction is a Y-axis projection direction for a piezoelectric substrate. SOLUTION: In an oscillator, a pair of comb-like electrodes 2 and 3 are formed on the surface of the strip-like piezoelectric substrate 1. High frequency signals are applied to a pair of comb-like electrodes 2 and 3 from a signal generation source 4. The comb teeth parts 2a, 2a,... and the comb teeth parts 3a, 3a... of the comb-like electrodes 2 and 3 are formed and arranged to be vertical to the longitudinal direction (transmission direction) of the piezoelectric substrate 1. When the high frequency signal is applied to the electrodes 2 and 3 from the signal generation source 4, the surface acoustic wave 5 is generated and it travels on the surface of the piezoelectric substrate 1 in the longitudinal direction. A bulk wave 6 travels in the thickness of the piezoelectric substrate 1. The single crystal of lithium niobate is used as the piezoelectric substrate 1 and that whose crystal orientation is 41±15 deg. rotary cut and whose transmission direction of the surface acoustic wave is the Y-axis projection direction is used.
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