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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an ultrasonic microphone according to the
present invention, FIG. 1 is a front view with a quarter cross section, and FIG. 2 is a plan view
with a part cut away. 1 иии и и и Bottomed cylindrical metal case, 1a и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и Circumferential groove.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic III
microphone which is used as a transmitter for irradiating ultrasonic waves in the air and is used
as a receiver for receiving ultrasonic waves in response to the ultrasonic waves. I will explain. In
FIG. 1 [i, I is a metal case made of pressed Km by press town, 1 is a bottom surface of the metal
case as a vibrator, and O inner surface Kl! Piezoelectric element which is stuck by adhesive agent,
J is a metal cover plate sealed to the open edge of the metal cane O cylinder, and gauze is a
center of the metal cover plate 3 through an insulating bush I (1 1) 2? ? 3 = QJ In one of the
terminal legs which has been inserted, electrical KII is carried out by means of the external
electrodes of the piezoelectric element and the lead wires. At the other terminal leg directly fixed
to the detail of the metal cover plate 3 as well as in the 7Fi, it is electrically connected to the
inner electrode electrode b of the piezoelectric element through the metal case l. It is a wellknown book, but it is a book in which a circumferential groove is formed on a key point on the
outer surface of the metal case 1111'1'1'2b as shown in the present invention. I on the outer
surface of the metal case In a conventional ultrasonic microphone which does not have a shell
structure, when the composite of the bottom of the metal case and the piezoelectric element is
integrated to exhibit a weft vibration like a dotted line, a part of the vibration is a metal case
5IIIK. The problem is that the metal * fiK transmission to induce harmful ? 1 resonance, but in
the present case the circumferential groove is formed on the outer surface of the cylindrical
portion of the metal case through the above-mentioned proposal, and it is propagated to the
metal caustic It was decided to shout out the vibration that it is. ! There is a big effect to solve the
point. The cliff, tt 'example is formed on the outer surface of the case of the whole city case (I
formed ? # I! Although the same circumferential groove may be formed on the inner surface
side of the cylindrical portion, and in the same embodiment, the circumferential groove is
formed, but either one or both of the inner and outer surfaces of the cylindrical portion may be
used. Several concentric grooves or spiral grooves may be formed, which has the advantage of
further enhancing the blocking effect of the propagation vibration.
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