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JPH0746695

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DESCRIPTION JPH0746695
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
airborne ultrasonic transmitter-receiver, and more particularly to an airborne ultrasonic
transmitter-receiver used for detecting an object and controlling traffic.
[0002]
2. Description of the Related Art Heretofore, as shown in FIG. 2, an air ultrasonic transducer of
this type has been used. When an electric pulse is applied to the piezoelectric ceramic 2, the
piezoelectric ceramic 2 causes respiratory vibration in the radial direction to generate an
ultrasonic wave. It is known that the direction of movement of the ultrasonic wave is converted
by the reflection scale 1 and the phase adjustment equalizer 3 and the ultrasonic wave goes
straight in the axial direction of the reflection scale 1. The directivity in the traveling direction is
determined by the configuration, the shape, and the size of the reflecting bulk 1, the piezoelectric
ceramic 2, and the phase adjusting equalizer 3.
[0003]
In the conventional ultrasonic transducer, when the shapes of the reflection bulk 1, the
piezoelectric ceramic 2 and the phase adjustment equalizer 3 are determined, the directivity is
determined according to the shape, and the directivity is determined. There is a drawback that
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the angle can not be changed. In the present invention, in order to eliminate these defects, as
shown in FIG. 1, the directivity can be controlled by shaving the back surface opposite to the
conical front surface of the phase adjusting equalizer into the conical recess 4 It is an object of
the present invention to provide an airborne ultrasonic transducer capable of changing the
pointing angle.
[0004]
[Means for Solving the Problems] In order to solve the above-mentioned problems, the present
invention is characterized by the use of a cone on the back surface opposite to the front surface
in the direction in which the ultrasonic waves of the air conditioning ultrasonic transducer are
adjusted. An aerial ultrasonic transducer capable of controlling directivity and directional angle
by forming a recess is provided. That is, according to the present invention, an ultrasonic wave
phase in a cylindrical shape generated by vibration of a piezoelectric ceramic is changed by the
phase adjusting equalizer formed inside the cylindrical piezoelectric ceramic, and the shape of
the back surface of the phase adjusting equalizer is changed. The ultrasonic wave phase can be
varied.
[0005]
[Function] By configuring the phase adjustment equalizer having a conical concave portion on
the back surface inside the cylindrical piezoelectric ceramic, the directivity and directivity angle
of ultrasonic waves radiated into the air can be easily set to specific values. It becomes possible.
[0006]
An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a phase adjusting equalizer 3 according to an embodiment of the present invention.
The phase adjustment equalizer 3 is a cone-shaped concave portion 4 with a diameter D3 and a
depth h according to the present invention in which a cylinder having a diameter D1 and a length
11 and a cone having a diameter D2 and a height 12 are integrally processed. It is a structure
provided with the diagonal grid in FIG. As shown in FIG. 2, the directivity of the ultrasonic
transducer obtained by fixing the phase adjusting equalizer 3 shown in FIG. 1 according to the
present invention to the inside of the cylindrical piezoelectric ceramic 2 is shown in FIG. The
directivity pattern as shown is obtained. This is because the directivity angle (3 dB attenuation
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angle) changes from θ1 to θ2 as compared with the directivity pattern shown in FIG. 3A
obtained when using a conventional phase adjustment equalizer that does not have a conical
recess. . This is because, in the ultrasonic transducer having a structure as shown in FIG. 2, the
phase of the ultrasonic wave generated inside the cylinder by the vibration of the cylindrical
piezoelectric ceramic 2 is delayed by the conical recess 4 of the phase adjusting equalizer 3 It is
an effect. Therefore, an arbitrary directivity pattern can be obtained by changing the shape
(diameter D3 and depth h) of the conical recess 4 of the phase adjustment equalizer 3. As
described above, according to the present invention, it is possible to provide an ultrasonic
transducer having an advantage that the directivity pattern can be controlled by using the conical
recess 4 as the phase adjustment equalizer 3 in the ultrasonic transducer. It became.
[0007]
As described above, according to the present invention, only by processing the back surface of
the phase adjustment equalizer, which is a component of the air ultrasonic transducer, into a
recess without changing the overall shape. The directivity angle of the air ultrasonic transducer
can be easily controlled.
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