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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view showing an embodiment of the
ultrasonic ceramic microphone according to the present invention, FIG. 2 is a longitudinal
sectional view thereof, and FIG. 3 is a sectional view E of a resonator used in the same
microphone. · Ceramic vibrator, 6 · · · · · · Metal diaphragm, 8 · · · · · · · · ·
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a next ultrasonic
ceramic microphone using a resonator formed by sandwiching a truncated cone-like gold II
diaphragm between two polarized ceramic vibrators. As a conventional ultrasonic ceramic
ceramic microphone, a central portion Kkh combined axis of a piezoelectric ceramic ceramic
vibrator is provided, and a metal cone resonator is coupled to this coupling axis to make an
acoustic conversion element of ultrasonic wave as a compensation metal resonator. In this
configuration, the overall height becomes larger in shape, and in the following case, the
resonator will be small by all means, and the output will be small. ,. The present invention
eliminates the above-mentioned conventional drawbacks. Hereinafter, the present invention will
be described with reference to the drawings of an embodiment. The terminal board (II) is a
terminal board on which the terminal (2) is implanted, and the resonator (4) is attached to the
terminal board ill via the KFi support (3). That is, the resonator + 41 tf, the two ceramic pieces,
and the vibrator + 51 are formed in a truncated cone shape, and the diaphragm J16 made of a
precious metal JIg is sandwiched and bonded. In addition, the two ceramic vibrators + 51H are
attached to the metal diaphragm f6 + K9 so that the polarization directions are in contact with
each other. And, this resonator + 41 is attached by covering the north terminal plate II + with a
case till provided with a shielding net (7) on the upper surface, and the one ceramic vibrator (5)
is lead wire (9) K In this case (8), the other ceramic vibrator 5) is connected to a terminal + 21 by
a lead machine (9). As described above, it is possible to use a resonator having a truncated coneshaped metal diaphragm tube between the ceramic vibrator and the vibrator, and to make the
metal diaphragm large. 49-28016- (', 3, ...) 3 When used for ultrasonic wave reception, the
sensitivity is high, and when used as a speaker, the sound output is large. Since air between the
case front surface and the resonator is overlapped and resonated with this, it is possible to make
the book have a high feeling f and to have a large output. In addition, by sandwiching a metal
diaphragm between ceramic wJ beams, the resonance resistance becomes large, and it is not felt
that the oscillation becomes unstable at the resonance frequency. Furthermore, such a
configuration VC + K can reduce the overall height and make the microphone thinner, which is
extremely useful value.
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