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JPH05328496

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DESCRIPTION JPH05328496
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
open type ultrasonic microphone, and more particularly to an ultrasonic type.
[0002]
2. Description of the Related Art As shown in FIG. 3, an open type ultrasonic microphone
disclosed in Japanese Patent Application Laid-Open No. 56-42499 includes a diaphragm 1 made
of a disk-shaped aluminum material or other metal material. A piezoelectric element 2 made of
PZT-based piezoelectric ceramic or the like bonded to one surface of the diaphragm 1, a conical
resonator 3 whose apex side is fixed to the center of the other surface of the diaphragm 1, the
piezoelectric element 2 The terminal block 4 holding the input / output terminals 41 and 42 and
the terminal block 4 which holds these and is fixed to the one end opening side, the metal
dustproof net between the collar 6 and the other end opening side 7 is formed as what consists
of the cylinder 5 by which clamping arrangement | positioning was carried out. One surface of
the piezoelectric element 2 whose both surfaces are electrodes is connected to the input / output
terminal 41 through the lead wire 43, and the other surface fixed to the diaphragm 1 with an
adhesive is the diaphragm 1 and the lead wire. And 44 are connected to the input / output
terminal 42. In the figure, numeral 8 denotes a vibration-proof material which is provided
between the piezoelectric element 2 and the terminal block 4 and prevents the vibration of the
piezoelectric element 2 and the diaphragm 1 from being transmitted to the terminal block 4. .
04-05-2019
1
[0003]
When this open type ultrasonic microphone is used as a human body detection sensor for an
automatic door or a car detection sensor in a parking lot as a transmitting and receiving wave,
the reverberation characteristic becomes a problem. That is, when the reverberation at the time
of transmission does not disappear early, when the distance to the detected object becomes close,
discrimination between the reflection waveform from the detected object and the reverberation
waveform becomes impossible, and as a result, object detection can be performed. It will be gone.
[0004]
The present invention has been made in view of such a point, and an object thereof is to provide
an open type ultrasonic microphone having a short reverberation time and a high ability to
detect a near distance object.
[0005]
According to the present invention, there is provided a diaphragm formed in a disk shape, a
piezoelectric element bonded to one surface of the diaphragm, and a cone fixed to the other
surface of the diaphragm. Resonator, a terminal block holding an input / output terminal to the
piezoelectric element, and the terminal block housed at one end opening side and the dustproof
net disposed at the other end opening side An open type ultrasonic microphone having a
cylindrical body, characterized in that a vibration-proof material is held between a color that is
positioned in the cylindrical body and is positioning the dustproof net and the dustproof net. is
there.
[0006]
According to the present invention, the vibration-proof material prevents the excitation of the
collar, the dustproof net and the cylinder, and the reverberation is attenuated early.
[0007]
The present invention will now be described in detail based on the illustrated embodiments.
Only parts different from the conventional example will be described.
04-05-2019
2
The members substantially the same as those of the prior art are given the same reference
numerals.
In the embodiment shown in FIG. 1, the vibration-proof material 9 having flexibility is held
between the tip end edge of the cylindrical collar 6 and the dustproof net 7 so that the collar 6,
the dustproof net 7 and The excitation of the cylindrical body 5 is prevented, and the
reverberation is attenuated by the timing of reception to facilitate detection of the received
signal.
[0008]
In the embodiment shown in FIG. 2, the vibration isolation material 9 is disposed between the tip
end edge of the cylindrical collar 6 and the dustproof net 7, and the side of the terminal block 4
to which the piezoelectric element 2 and the diaphragm 1 are attached The sound absorbing
material 10 is attached to the surface of the body to prevent the occurrence of multiple
reflections generated in the cylinder 5 by the sound absorbing material 10, attenuate the
multiple reflections by the timing of reception, and detect the received wave signal. I am making
it easy. The sound absorbing material 10 may be provided only in the vicinity of the input /
output terminals 41 and 42, but it is preferable to provide the sound absorbing material 10 all
around the circumferential direction.
[0009]
As described above, according to the present invention, the anti-vibration material sandwiched
between the collar for positioning the dustproof net positioned in the cylinder and the dustproof
net is the collar or dustproof net. And reverberation decays early to prevent excitation of the
cylinder, so that the reverberation waveform is not affected when the reflected wave from the
near object is received, and the near distance detection performance is improved. it can.
04-05-2019
3
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