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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
ultrasonic ceramic microphone, FIG. 2 is a top view of the same, and FIG. 3 is a cross-sectional
view of an ultrasonic ceramic microphone in one embodiment of the present invention. 4 is the
top view, FIG. 5 is a view showing the reception sensitivity characteristic in high humidity, FIG. 6
is a reception sensitivity characteristic view in normal temperature and normal humidity, and
FIG. 7 is the oscillation output characteristic view. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · thin film. Fig.1 Fig.2 Fig.3 Fig.4 Fig.4 1-75-real open 49-36929
C2) Fig. 5 (dh / v / m- .. Bay) / one? 3540 class 一 full length B 4 k 建 (H 'Hz 第 wave number for
Fig. 4 o, C k HE) 1 76-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
ceramic microphone configured to obtain a moisture-proof effect without reducing the receiving
sensitivity and the oscillation output. The conventional ultrasonic ceramic and microphone are
permitted together with FIGS. 1 and 2. Furthermore, in the figure, a basic resonator consisting of
a bimorph resonator in which two 1-m disc type ceramic vibrators are bonded together,
harmonics of the flexural vibration of the disk are used. 2 is an inverted-cone-type additional
resonator made of a high-Q metal 4 material such as aluminum, 3 and 4 are basic wire 4936929-022 root 10, lead from opposing electrodes, lead wire for 9 outputs, 6 is basic wire 9
supporting plates, 6 is a case, supporting and fixing the resonator 1? Fi is a mesh for shielding
provided on the inner surface of the upper open O portion of the case 6 above. The acoustic
energy that has passed through the shielding mesh and T is received by the l1ff resonator 2 and
converted into electrical energy by the basic resonator 1. In such ultrasonic ceramic
microphones, when used in a wet environment, the sound sensitivity is lowered by the adhesion
of water to the shield when it is attached to the shield, and when it is considered that it may
cause corrosion on the floor, it is I had it. The uninvention is ntt devised to eliminate the abovementioned conventional defects, and an embodiment thereof will be described with reference to
FIGS. . ・ In case of non-invention, a metal thin film made of aluminum foil or the like at the top
opening of case 6, metal plated with aluminum or the like sprayed on nylon etc. Resin 11 & a in
front of acrylic resin etc. 2 . -It is the structure which stuck the thin film 8 which consists of 6,
49-36929-033n. FIG. 6 is a graph showing the reception sensitivity characteristics at high
temperatures, and what) shows the characteristics according to the present invention product
and (b) characteristics according to the Fi conventional product. As can be understood from this
figure, in the conventional product, a drop of * m is caused by the adhesion of water droplets to
D-Menyu in high humidity, but this is hardly found in the product of the present invention. This
shows the moisture-proof effect of the thin film 8 attached to the # face opening of the case 1.
"The sense of compensation f1 in high temperature and humidity Output power is as shown in
Fig. 6 and Fig. 7 as it is shown in Fig. 6. It is possible to R & R to show the corporate identity. The
present invention is constructed as IIII as above, and it is possible to obtain the moisture-proof
effect without lowering the receiving tM sensitivity and the communication output, and the
receiving gf 高 in high latency It is something that can be raised.
Also, their formation is simple and inexpensive, and can be provided.