Purpose: in order to improve the resonance frequency temperature characteristic of oscillator by using oscillation mode with its basement of tuning fork type feature oscillation mode higher mode. Construction: tuning fork type crystal oscillator 61 is cut in angle ф against the Y-axis (power axis) of mine crystal and sets (0-10 degree) so as to the direction Y of tuning fork. With such oscillator, the oscillation mode of basement (rear portion in the fork region of tuning fork) is characterized in that higher mode to tuning fork oscillation mode (bending oscillation mode) 62 and direction of displacement 63. Under these conditions, frequency-temperature characteristic is in 0 deg.C-40 deg.There is replacement about 2PPM, to greatly improve characteristic compared with the fundamental mode of basement in the range of C. By giving the photo etching of thin crystal template except mine crystal via the resonator mode of some printings, such oscillator can be once mass production.
展开▼
