| 摘要 |
PURPOSE:To reduce the effect of harmonics by setting the length of an electrode adhered to a side face part in the long side direction supported perpendicularly of a piezoelectric vibrating plate to 78.0-79.5% of the vibrating plate so as to increase (series resonance resistance to ternary harmonics/series resonance resistance to fundamental wave. CONSTITUTION:The vibrating plate 11 is fixed to a frame-formed support part 13 via a connecting part 12 led vertically from both side faces (X planes). Electrodes 14a, 14b for exciting lengthwise vibration are adhered nearly symmetrically around the connecting part 12 and lead electrodes 15a, 15b are adhered from a leg part 13a of the support part 13 to a base 13b. L-d subtracting a width (d) from the total length L of the vibrating plate 11 is taken as the length of the vibrating plate as a part participating to the vibration and similarly (l-d) subtracting the width (d) from the total length (l) of the electrodes 14a, 14b is used as the length of the electrodes, then it is considered that the optimum electrode length for vibrating the fundamental wave is within nearly 66.7-80% or 83% of the length of the vibrating plate. |
