| 摘要 |
PURPOSE:To obtain an oscillating element of high quality which increases a product region where a single resonance mode is obtained with a reduced spurious mode, by clearing up the relationship between the oscillating energy shut-in quantity optimum to the normal room temperature and the rotating direction around Y axis of a crystal and then shifting the peak temperature of the frequency temperature characteristics to the corresponding room temperature. CONSTITUTION:A relationship is defined as zeta=theta/8.theta+(0.65+ or -0.1) between the revolving angle theta around Y axis of a single crystal of an X plate and the shut-in quantity of oscillating energy. Curves A-E show the temperature characteristics of various samples of different energy shut-in quantities zeta. A curve F shows the relationship between the energy shut-in quantity Z and the angle theta with which the peak of the temperature characteristic curve is equal to a normal room temperature (23 deg.C). A dotted line G shows the upper limit value (zeta=125) of the shut-in quantity with which an oscillator has a single mode. As shown clearly in the diagram, an approximate equation zeta= theta/8+0.65 is satisfied with the curve F which has the quantity zeta of <=1.25 at room temperature. If the ambient temperature at which an oscillator is used is set at said room temperature + or -5 deg.C, an approximate equation zeta=theta(0.65+ or -0.1)/8 is satisfied for a curve equivalent to the curve F. |
