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JPH04238498

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DESCRIPTION JPH04238498
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic sensor for detecting an obstacle by transmitting and receiving ultrasonic waves.
[0002]
2. Description of the Related Art Conventionally, an ultrasonic sensor of this type for detecting an
obstacle by transmitting and receiving ultrasonic waves comprises an ultrasonic transducer 1
and an ultrasonic wave, as shown in FIGS. 3 and 4. It is composed of a buffer member 2 having
an opening 2a for transmission and reception and surrounding the ultrasonic transducer 1. The
ultrasonic transducer 1 transmits an ultrasonic wave through the opening 2a and receives a
reflected wave from an obstacle. I was supposed to In the figure, reference numeral 3 denotes a
shield line for inputting and outputting the transmission signal and the reception signal, and
reference numeral 4 denotes a sound absorbing material for preventing the ingress and egress of
sound from the rear of the ultrasonic transducer 1.
[0003]
However, in the above-described conventional example, water may intrude from the gap 5
formed between the ultrasonic transducer 1 and the buffer member 2; There is a problem that
the reverberation characteristic is deteriorated by the intrusion of water. That is, when the
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ultrasonic transducer 1 is driven by a tone burst signal as shown in FIG. 5 (a), the reverberation
time t1 becomes unstable and becomes long as shown in FIG. 5 (b). When there is a sound, the
reflected wave from the obstacle can not be identified, so there is a problem that the near
distance measurement performance is impaired. In addition, FIG.5 (c) has shown the
reverberation characteristic when water has not infiltrated.
[0004]
The present invention is intended to solve the above problems, and can prevent deterioration of
reverberation characteristics due to water intrusion, and can prevent short distance ranging
performance from being impaired, and It is an object of the present invention to provide an
ultrasonic sensor in which the radiation surface of the ultrasonic transducer is protected.
[0005]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
comprises an ultrasonic transducer, and a buffer member having an aperture for transmitting
and receiving ultrasonic waves and surrounding the ultrasonic transducer. And an ultrasonic
transducer for transmitting ultrasonic waves through the opening and receiving a reflected wave
from an obstacle, wherein the sealing layer made of thin rubber or the like for closing the
opening is It adheres to the radiation surface of the acoustic transducer, and ultrasonic waves are
transmitted and received through the seal layer.
[0006]
According to the above configuration, the buffer member is disposed so as to surround the
ultrasonic transducer, and the ultrasonic sensor is configured to transmit and receive the
ultrasonic wave through the opening for ultrasonic wave transmission and reception of the buffer
member. A seal layer made of thin rubber or the like closing the opening is adhered to the
radiation surface of the ultrasonic transducer, and ultrasonic waves are transmitted and received
through the seal layer. The seal layer can prevent water from invading in between, prevent the
deterioration of the reverberation characteristic due to the water infiltration, and prevent the
near distance ranging performance from being impaired, and further, the ultrasonic transducer
Can protect the emitting surface of
[0007]
1 and 2 show an embodiment of the present invention, wherein an ultrasonic transducer 1 and a
buffer member 2 having an opening 2a for transmitting and receiving ultrasonic waves and
surrounding the ultrasonic transducer 1 are shown. And the ultrasonic transducer 1 transmits an
ultrasonic wave through the opening 2a and receives a reflected wave from an obstacle. A sealing
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layer 6 made of a thin rubber or the like to be closed is adhered to the radiation surface of the
ultrasonic transducer 1 so that ultrasonic waves are transmitted and received through the sealing
layer 6.
[0008]
Now, in the embodiment, since the seal layer 6 made of thin rubber or the like for closing the
opening 2a for ultrasonic wave transmission and reception of the buffer member 1 is adhered to
the radiation surface of the ultrasonic vibrator 1, Water can be prevented from invading the gap
6 formed between the ultrasonic transducer 1 and the buffer member 2 by the seal layer 6, and
deterioration of the reverberation characteristics due to water infiltration can be prevented.
Therefore, the reverberation characteristics always become as shown in FIG. 5C, and the near
distance measurement performance is not impaired.
Further, since the radiation surface of the ultrasonic transducer 1 is protected by the ultrasonic
transducer 1 surrounded by the buffer member 2 and the seal layer 6 closing the opening 2a,
damage due to external factors can be prevented, and the reliability is improved. Can be
improved.
In addition, since the seal layer 6 is formed of thin rubber, it does not adversely affect the
transmission and reception performance of ultrasonic waves.
[0009]
The present invention is configured as described above, in which the buffer member is disposed
so as to surround the ultrasonic transducer, and the ultrasonic wave is transmitted / received
through the aperture for ultrasonic transmission / reception of the buffer member. In the
ultrasonic sensor, the sealing layer made of thin rubber or the like closing the opening is adhered
to the radiation surface of the ultrasonic transducer, and ultrasonic waves are transmitted and
received through the sealing layer. The seal layer can prevent water from invading between the
acoustic transducer and the buffer member, and can prevent deterioration of the reverberation
characteristic due to water infiltration, so that the near distance measurement performance is not
impaired. In addition, the radiation surface of the ultrasonic transducer can be protected.
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[0010]
Brief description of the drawings
[0011]
1 is a cross-sectional view showing an embodiment of the present invention.
[0012]
2 is a front view of the same.
[0013]
3 is a cross-sectional view of a conventional example.
[0014]
4 is a front view of the same.
[0015]
5 is an operation explanatory diagram of the conventional example and the present invention.
[0016]
Explanation of sign
[0017]
1 Ultrasonic Transducer 2 Buffering Member 2a Opening 6 Sealing Layer
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