Abstract
The utility of a plain tuning fork(Fig. 1)is experimentally examined in this paper. The optimum position and dimensions of a piezoelectric ceramics which minimize the capacitance ratio γ of a plain tuning fork are investigated(Figs. 2, 3, 4, 5)and equivalent constants of the plain tuning fork are measured under such conditions(Figs. 6, 7, 8 and Table 1). Resonance frequency is 28〜43% higher than that of a conventional tuning fork, and the value of γ is about 25% larger but Q is about 25% higher than those of a conventional tuning fork. Moreover, spurious characteristics(Figs. 9, 10, 11), influence of additional mass(Figs. 12, 13), supporting device(Figs. 14, 15, 16)and attenuation characteristic of a differential type filter composed of two plain tuning forks(Figs. 17, 18 and Table 2, 3)are discussed in detail. As a result, it is confirmed that the plain tuning fork is favorable for practical use in the low frequency region.
