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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an ultrasonic
microphone according to the present invention. 1 · · · Metal case, 1a · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · insulating substrate, 4,4 '· · · · ·Lead.
DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an ultrasonic
microphone used as a transmitter for generating ultrasonic waves in the air and as a receiver for
responding to ultrasonic waves emitted in the air, An embodiment of the drawings will be
described below. In the drawings, 1 is a thin-walled metal case formed in a bottomed cylindrical
shape by pressing or the like. 2 is a piezoelectric element attached to the inner bottom surface of
the metal case by adhesive or the like 10+, and metallized electrode surfaces 2a and 2a 'by
roasting and the like are provided on both sides of the surface table 1 in the thickness direction
Zirconate titanate 1 Hf) -based 1-/-? Polarized to exhibit It consists of Knon compound etc. An
insulating substrate 3 directly connects the open end 1a of the metal case 1, and an insulating
substrate 3 is connected to the metallized electrode surface 2a exposed below the piezoelectric
element and the inner wall surface of the metal case 1. , And a pair of lead wires drawn outward
by the terminal legs 5, 5 '. In the past, this type of ultrasonic microphone used a piezoelectric
dwarf exhibiting bending vibration, so the metal case is smoothed only on the upper surface
(bottom surface to the opening) to which the piezoelectric element is attached, and the outer
surface is also upper surface and opening edge It vibrates in the shape of a circular arc with the
bending surface of it as a nodal point. The vibration of the metal case is transmitted on the round
edge substrate to affect the frequency custom-made, and the sensitivity is adversely affected.
Avoid opening the edge of the opening of the metal case and the insulation case. Cork, urethane
foam Etc. ring-like vibration Ib, insert the absorbent material and by adhesive: welding is
necessary, extra door parts, need to take the em I! <-Cork or urethane foam, etc.-31-due to
vibrational absorbers of material, due to S Separating due to long-term use. On the other hand,
the ultrasonic microphone of the present invention employs a piezoelectric element exhibiting
vibration in the thickness direction as a vibration source, and vibrates only the upper bottom
surface of the bottomed cylindrical metal case only in the axial direction, and the outer surface of
the metal case Since the vibration absorbing material made of cork and the like was not
interposed, the vibration absorbing material was interposed by directly observing the opening
edge of the metal case on the insulating substrate. It has the excellent effect of solving all the
conventional drawbacks and miniaturizing it. Therefore, in the present invention, it is possible to
simplify the structure and reduce the product price by using the piezoelectric element exhibiting
vibration in the thickness direction as described above, or the piezoelectric corer exhibiting
vibration in the thickness direction is a member of the element By increasing the thickness, the
frequency can be increased, and the directivity angle of the ultrasonic wave can be narrowed
concomitantly with this, so it is particularly suitable for an ultrasonic microphone with a small
directivity angle, such as a paper jam detector of a copying machine using this custom. is there.
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