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Brief description of the drawings
FIG. 1 is a plan view showing a conventional electroacoustic transducer, FIG. 2 is a circuit
diagram showing an example of an oscillation circuit using the electroacoustic transducer, and
FIG. 3 is a dimension of the electroacoustic transducer. A plan view for explaining the
relationship between the capacitance and the capacitance between the main electrode and the
return electrode, FIG. 4 is a graph showing the relationship between the dimension and the
capacitance C, FIG. 5 c1 dimension 1 and the capacitance FIG. 6 is a graph showing the
relationship with C, FIG. 6 is a comparative example to an embodiment of the present invention,
and a plan view showing a structure in which a feedback electrode is provided along the
peripheral portion of the piezoelectric ceramic vibrator FIG. 8 is a plan view showing a first
embodiment of the electro-acoustic transducer according to the present invention, FIG. 8 is a
plan view showing a second embodiment of the present invention, and FIGS. 9 and 10 use the
electro-acoustic transducer shown in FIG. It is a top view which shows an example. 1, IB to ID:
piezoelectric ceramic vibrator, 2, 2A to 2D: main electrode, 3, 3A to 3C: feedback electrode, 3D,
3E: feedback electrode portion, 4, 4A to 4E ... gap, 10.11 ... conductive paint.
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