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JPS54153926

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DESCRIPTION JPS54153926
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an ultrasonic microphone according to the
present invention, wherein A is a front sectional view and B is a plan sectional view taken along
line A in FIG. 1 · · · Metal case, 1a · · · · · · · · Opening edge, 1b · · · · · · · · · · · · · · · · · Piezoelectric
element, 2at 2b · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Metal cover, 5, 6 · · · · · · · terminal legs 8, 9, · · · · · ·
lead wire, 10 · · · · · Correction Akira 53.6. 30
The present invention relates to an ultrasonic microphone used as a transmitter for emitting
ultrasonic waves in the air, and as a delivery unit for responding to ultrasonic waves emitted in
the air, and the target treatment is moisture resistance An embodiment of the present invention
will be described below in terms of providing an excellent ultrasonic microphone. In the drawing,
1 is a thin-walled metal case formed into a cylindrical shape with a bottom by pressing or the
like, 2 is concentric with an adhesive or the like on the inner bottom surface of the metal case 1
by 1-stone Ll / (1) It is a piezoelectric element stuck, and counter electrode 2a on front and back.
It has 2b. , 3 is a metal lid sealed to the flange-like opening edge 1a of the metal case via a
porous vibration absorbing spacer 4, and 5 and 6 are a pair of the metal lid 3 inserted through
two parts of the main part In the terminal leg, one end, the child leg 5 is electrically insulated
through the insulating bush 7 and the other terminal leg 6 is directly inserted into the metal
cover 3. Leads 8 and 9 respectively electrically connect between the outer surface electrode 2a
of the piezoelectric element and one of the terminal legs 5 and between the inner surface of the
piezoelectric element & the crucible 2a and the other of the insulator legs 6, respectively. It is a
line. The configuration is almost the same as that of the conventional configuration, but the
present solution is to apply a thin layer 10 made of, for example, a fluorine resin-based paint, to
the outer surface 1b of the metal case. In the prior art, this 8w acoustic microphone had a
drawback that the frequency characteristics were seriously impaired when moisture or adhesion
was made to the outer surface of the metal case, which prevented the outer surface of the metal
04-05-2019
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case from being wetted. Yes, there is a water exchange effect on the outer surface of the gold and
amber case 2-! Because moisture is attached to the outer surface of the metal case, it has a great
effect that stable frequency characteristics can be obtained over a long period of time.
04-05-2019
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