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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an ultrasonic ceramic
microphone according to the prior art, FIG. 2 is a graph showing the reception sensitivity of the
microphone, and FIG. 3 is an ultrasonic ceramic microphone according to an embodiment of the
present invention. FIG. 4 is a characteristic view of reception sensitivity of the same microphone.
4 ... ceramic resonator, 5 ... connector, 6 ... resonant plate, 10 ... shock absorber Figure 1 Figure
2? Zhouhoku-85-Japanese Utility Model Publication No. 49-125037 (2) Fig. 3 Fig. 4 Fig. 1 1 1
[Detailed Description of the Invention] The present invention tel 屹 F F F な ど F 係 り 趨 係 り 係
り 係 り 係 り 係 り 係 り 係 り 係 り 係 り 係 り 係 り 係 り 係 り 係 り 係 りIt is wonderful.
Hereinafter, this type of conventional blue-green-blue 9 (, i ita-tsu-on will be described with
reference to FIG. 1 and FIG. 2). First, in Fig. 1, 1ri universal plate, 2 is embedded in terminal plate
1 and is a terminal, 3 is formed on the upper surface of terminal plate 1 and elastic body for
attaching nickel, number is this elastic Body 3 + K # ff 1 1 large ceramic, # # pendulum, 6 is a
connector fixed to the center of co-torsion 402 through it, 6 is a resonator plate in the form of
111 attached to connector 6, 7 is a resonance The cake 4 attached to the terminal plate 1 so as
to cover the resonator 4 and the resonance plate 6 etc., 3 is a punching metal attached to the
upper surface opening of the cake 1 and electrically connects the Qij condenser 4 and the
terminal 2 Lead wire. In such a structure, acoustic energy as air loss is received by the resonance
plate 6, converted to electrical energy by the resonator 4, and pulled out to the outside through
the lead wire 9 and the terminal 2. Also, externally applied electrical energy is converted to
mechanical energy at resonance 74. With external Kfi being emitted as acoustic energy through
lI-rear plate. Now, if the diameter of the resonator 4 and the resonance plate 6 is increased in this
microphone, the reception sensitivity is increased, and the acoustic energy to be transmitted is
increased. However, as described above, the diameters of the resonator 4 and the resonance plate
6 are as follows: Giro · −− + effect, 2 nd f 707 〒, n um When you use a1; 6 惇 1 ultrasonic
wave, there may be an audible sound at the same time. This is extremely inconvenient when it is
used as a power for detecting intruders with bitumen wave ceramic, TAMICROFF 3 and ON with
an anti-theft device or the like. After all, it can be said that increasing the diameter of the
resonator 4 and the resonance plate 6 can be tI at best, as it is possible to increase the receiving
sensitivity and the transmitting front tube energy. -Making the size of the resonance plate 6 large
has a drawback that the Q of the resonance becomes high and the band in the case of operating
for reception becomes narrow as shown in FIG. The present invention has been invented to
eliminate the above-mentioned disadvantages of the prior art, and it is very difficult to make the
ceramic, the resonator and the resonance plate larger. It is an attempt to spread the band.
Hereinafter, an embodiment of the present invention will be described with reference to the prior
art and the m-place with the same reference numerals as in FIG. The cushioning material 10 is
attached, and an elastic 11 iF sword of a V-run rubber system is applied at a ring face 4 or K, or a
go-i, a tongue is inserted at a + t. Since the present invention is configured as described above K,
it is generated when the transmission 8 force is increased by the conventional resonator and the
diameter of the resonance plate CI, and the 'audio sound can be prevented. Even if it is used as a
sensor such as an antitheft device, no period M occurs. In addition, as shown in Fig. 4 of the
grass, the band can be broadened also in the receiving sensitivity, and the l11M property is large.