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JPS63258195

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DESCRIPTION JPS63258195
[0001]
Technical Field 1 The present invention relates to an ultrasonic array sensor which is provided
with a plurality of ultrasonic transducers having a horn, transmits ultrasonic waves from the
ultrasonic transducers, and receives a reflected wave from an object. [Background Art 1 ffi
acoustic wave sensor performs sensing using ultrasonic waves, and as a detection method, a
presence detection type pulse method that detects the distance to an object according to the time
required for pulse propagation, or a continuous wave There is known a Doppler system or the
like which detects the presence of a moving object based on the shift of the number of circulating
fluid reflected from the moving object. The ultrasonic wave has directivity characteristics due to
its short wavelength compared to the audible range, and can limit the detection range to a
specific direction to be detected. Conventionally, ultrasonic sensors have been used for many
purposes such as sensors for HA and FA, and sensors for crime prevention. However, as
described above, as “a limited detection range” Keratinization is one of the requirements for
technological development. Conventionally, as shown in FIG. 4, as a method for sharpening the
directivity of the ultrasonic wave generated from the ultrasonic transducer 1, there is a method
of expanding the radiation surface using the horn 2. As shown in FIG. The ultrasonic transducer
main body 3 is configured of the ultrasonic transducer 1 and the trumpet-shaped horn 2
provided on the ultrasonic transducer 1. Here, assuming that the piston vibrates as a plane wave
on the opening surface of the horn 2, the half-value angle θI7 □ is given by θ + 7z = sin− ′
(0, 71 persons / M). Here, α is the diameter within the opening of the horn 2 and λ is the
wavelength of the ultrasonic wave. From the above equation, the directivity can be made sharper
as the inside of the opening of the horn 2 is expanded. However, in general, the design of the
horn 2 is difficult, and there is an X while the horn 2 has to be long and large. FIG. 15 shows
another prior art example, in which twenty ultrasonic transducers 1 are arranged at intervals of
0.5λ in a linear manner to form directivity of half value angle # 5 ° deg. However, in this
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conventional example, there is a problem that many ultrasonic transducers 1 are required. FIG. 6
is a characteristic diagram showing the relationship between the angle (LE to 8N) at this time and
the gain (GAIN). Even when the ultrasonic transducers 1 are arranged as shown in FIG. 5, as is
apparent from FIG. 6, the side ropes are relatively large. OBJECTS OF THE INVENTION The
present invention is provided in view of the above-mentioned point, and is an ultrasonic wave
which has few ultrasonic transducers and which is not large in shape and which has small side
ropes and directivity of an included angle It is an object of the present invention to provide an
array sensor.
SUMMARY OF THE INVENTION The present invention relates to an ultrasonic array sensor for
transmitting ultrasonic waves and receiving reflected waves from an object, comprising a
plurality of ultrasonic vibrations having horns for sharpening the directivity of the ultrasonic
waves. An array is provided with a plurality of ultrasonic transducers arranged on the same plane
at a predetermined distance from at least a central ultrasonic transducer by providing a plurality
of transducers. The directivity characteristic is obtained by the product of the directivity of the
ultrasonic transducer. Embodiments of the present invention will be described below with
reference to the drawings. FIG. 1 shows the arrangement configuration of the present invention,
in which a plurality of ultrasonic transducers 1 having a predetermined horn 2 are arranged on
the same plane to constitute an ultrasonic array sensor. Six ultrasonic transducers 1 each having
a horn 2 around one ultrasonic transducer 1 having a horn 2 are arranged on the same plane,
and a distance between each ultrasonic transducer 1 is set. Is 5λ. FIG. 2 shows a block diagram
of an essential part of the ultrasonic array sensor, which is connected to the seven ultrasonic
transducer main bodies 3, the transmitting circuit 4 and the receiving circuit 5, respectively. The
seven ultrasonic transducer main bodies 3 are vibrated by the transmission circuit 4 to transmit
ultrasonic waves. Then, the reflected waves from the object are received by the seven ultrasonic
transducer main bodies 3, and the reception output is input to the reception circuit 5 to detect
the distance to the object or detect the presence of the moving object. It is like that. Incidentally,
since these detection methods are well known, the details will be omitted. FIG. 3 (a) shows an
array directivity factor (^ rray factor) when seven ultrasonic transducers 1 having horns 2 are
arranged at intervals of 5λ, and FIG. An example of the directivity of the sound wave transducer
1 is shown. The directivity obtained by the configuration shown in FIG. 1 is the product of the
array directivity coefficient and the directivity of the ultrasonic transducer 1, that is, the product
of FIG. 3 (, l) and FIG. 3 (b). Desired. FIG. 3 (e) shows the result, and it can be easily seen that the
small angle directivity of the side rope is obtained as compared with FIG. According to the
present invention, as described above, in an ultrasonic array sensor that transmits ultrasonic
waves and receives reflected waves from an object, a plurality of ultrasonic vibrations including
horns that sharpen the directivity of the ultrasonic waves Since a plurality of ultrasonic
transducers are arrayed on the same plane at a predetermined distance from at least the center
ultrasonic transducer by providing the transducer, the array directivity coefficient of the plurality
of ultrasonic transducers arrayed By obtaining the directional characteristics by the product of
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the directivity of the ultrasonic transducer provided with the horn and the ultrasonic transducer
having the horn, it is possible to use a small number of side ropes without increasing the size of
the ultrasonic transducer. The effect of easily obtaining the angular directivity is exhibited.
[0002]
Brief description of the drawings
[0003]
# 41 (a> (b) is a block diagram showing the arrangement of the ultrasonic transducers according
to the embodiment of the present invention, FIG. 2 is a block diagram of the main part of the
above, and FIG. Fig. 3 (b) is a characteristic diagram showing the coefficient, Fig. 3 (b) is a
characteristic diagram showing the directivity of the ultrasonic transducer, and Fig. 3 (c) is the
product of Fig. 3 (a) and (b). FIG. 4 is a cross-sectional view of the conventional example, FIG. 5 is
a configuration diagram of another conventional example, and FIG. 6 is a directional
characteristic view of the same.
1 is an ultrasonic transducer, 2 is a horn. Agent Patent Attorney Stone 1) Chief Seven (a) (b)
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