| 摘要 |
PURPOSE:To eliminate substantially the frequency fluctuation due to the thermal stress for the crystal oscillator in which the heating electrode is provided on the crystal plate to secure the temperature compensation, by securing the overall neutralization for the internal distortion of the thermal stress inside the crystal plate which is caused by the heating electrode. CONSTITUTION:Crystal plate 1' features the AT cut of 35 deg.14'. For the crystal oscillator, heating electrodes 6' and 7' are provided in the range of the right-left symmetric angle theta=120 deg. of axis X to the center axis on the X-Z plane and axis X2 is tilted by angle alpha clockwise or counterclockwise centering on axis Y, and exciting electrodes 2' and 3' are provided on both surfaces respectively. In addition, electrodes 4' and 5' extened up to the circumference area are provided. The temperature control circuit to be connected to the crystal oscillator features a simple constitution in that the constant voltage is applied between both the terminals of the serial circuit of heater H of the heating electrode, positive characteristic temperature-sensitive resistance element TH and resistance R each. And elevation angle alpha is set between 4 deg. and 40 deg. in order to minimize the frequency fluctuation. |
