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DESCRIPTION JP2005039740

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DESCRIPTION JP2005039740
An ultrasonic sensor is embedded in a bumper of a car or the like to detect an obstacle around
the car. In the conventional ultrasonic sensor, the reverberation time is inevitably long due to its
structure. There is a problem that an obstacle at a short distance can not be detected. In an
ultrasonic sensor, a reverberation time can be made short and stabilized by pressing a parallel
pin into a bottomed cylindrical case to suppress side vibration, and as a result, an obstacle at a
short distance can be reliably detected. Can. [Selected figure] Figure 1
Ultrasonic sensor
[0001]
The present invention relates to an ultrasonic sensor that transmits and receives ultrasonic
frequency bands.
[0002]
FIG. 2 shows a schematic longitudinal sectional view of the ultrasonic sensor according to the
conventional embodiment attached to the bumper of a car.
FIG. 4 shows a structural view of a bottomed cylindrical case of an ultrasonic sensor according to
a conventional embodiment. In FIG. 2, the piezoelectric element 1 is bonded to the inside of the
bottom of a bottomed cylindrical case 2 made of an aluminum material or the like to form a
unimorph vibrator. The input / output lead 5a is soldered from the opposite surface to the
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surface of the piezoelectric element 1 bonded to the bottomed cylindrical case 2 and the input /
output lead 5b is taken out from the bottomed cylindrical case 2 by soldering. The bonding
surface side of the piezoelectric element 1 with the bottomed cylindrical case 2 is electrically
connected to the bottomed cylindrical case 2, and further, the piezoelectric element 1, the input /
output lead 5 a, and the bottomed cylindrical case 2 And the input / output lead 5b are
electrically connected. The sound absorbing material 3 made of silicon foam or the like is placed
on the upper surface of the piezoelectric element 1, and further, the bottomed cylindrical case 2
is filled with the sealing agent 4 made of silicon material, urethane material or the like. . The
ultrasonic sensor is formed in such a manner that the inner circumferential surface of the hole
and the outer circumferential surface of the bottomed cylindrical case 2 of the ultrasonic sensor
contact over the entire circumference in the hole of the bumper 7 of the car which has been
previously drilled. It is embedded and installed.
[0003]
In the ultrasonic sensor according to the conventional embodiment, when an ultrasonic sensor is
embedded in a bumper of a car or the like to detect an obstacle around the car, a pulse burst
electric signal is input to the ultrasonic sensor. An ultrasonic signal corresponding to the input
pulse burst electric signal is oscillated from the ultrasonic sensor, the oscillated ultrasonic signal
reaches an obstacle, and an ultrasonic signal striking the obstacle is reflected by the obstacle. ,
Part of the reflected ultrasound signal returns to the same ultrasound sensor. The obstacle is
detected by receiving the reflected signal by the ultrasonic sensor. At this time, in the ultrasonic
sensor according to the conventional embodiment, the reverberation time is necessarily long due
to its structure, so there is a problem that an obstacle at a short distance can not be detected.
[0004]
A piezoelectric element is bonded to the inside of the bottom of a bottomed cylindrical case to
form a unimorph transducer, and a parallel pin is pressed in an ultrasonic sensor that transmits
and receives ultrasonic waves from the case outer surface of the vibrator. Thus, the side vibration
can be suppressed, and the reverberation time can be made short and stabilized, and as a result,
obstacles in a short distance can be reliably detected.
[0005]
In the ultrasonic sensor according to the embodiment of the present invention, the side vibration
is suppressed by press-fitting parallel pins to the side surfaces on both sides of the bottomed
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cylindrical case, and the reverberation time is stabilized short as shown in FIG. It becomes
possible.
It has been realized that when used for detecting an object such as a back sensor of an
automobile, it is possible to reliably detect an obstacle at a short distance.
[0006]
It has been realized that when used for detecting an object such as a back sensor of an
automobile, it is possible to reliably detect an obstacle at a short distance.
[0007]
In FIG. 1, the piezoelectric element 1 is bonded to the inside of the bottom of a bottomed
cylindrical case 2 made of an aluminum material or the like to form a unimorph vibrator.
The input / output lead 5a is soldered from the opposite surface to the surface of the
piezoelectric element 1 bonded to the bottomed cylindrical case 2 and the input / output lead 5b
is taken out from the bottomed cylindrical case 2 by soldering. The bonding surface side of the
piezoelectric element 1 with the bottomed cylindrical case 2 is electrically connected to the
bottomed cylindrical case 2, and further, the piezoelectric element 1, the input / output lead 5 a,
and the bottomed cylindrical case 2 And the input / output lead 5b are electrically connected. A
sound absorbing material 3 made of silicon foam or the like is placed on the upper surface of the
piezoelectric element 1, and parallel pins 6 made of a brass material or the like are attached to
the side surfaces on both sides of the bottomed cylindrical case as shown in FIG. The pressure is
set in the range 5 and the sealing agent 4 made of silicon material, urethane material or the like
is further filled in the bottomed cylindrical case 2 from above. As shown in FIG. 1 and FIG. 5, by
pressing the parallel pin into the bottomed cylindrical case 2, side vibration is suppressed, and
reverberation vibration of the outer peripheral side wall portion of the bottomed cylindrical case
is greatly suppressed. It will be. As a result, the reverberation time of the ultrasonic sensor itself
is significantly reduced, and the conduction of the reverberation vibration from the outer
peripheral side wall of the bottomed cylindrical case to the bumper 7 of the car is significantly
reduced. Mutual interference between vibrations of the cylindrical case 2 and the bumper 7 of
the car is significantly reduced. As a result, the reverberation time of the ultrasonic sensor is
totally reduced, and stable and reliable obstacle detection at a short distance becomes possible.
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[0008]
When used for detecting an object such as a back sensor of a car, an obstacle at a short distance
can be reliably detected.
[0009]
In the ultrasonic sensor according to the embodiment of the present invention, the side vibration
is suppressed by press-fitting parallel pins to the side surfaces on both sides of the bottomed
cylindrical case, and the reverberation time is stabilized short as shown in FIG. It becomes
possible.
[0010]
A schematic longitudinal sectional view of a state where the ultrasonic sensor according to the
embodiment of the present invention is attached to a bumper of a car A schematic longitudinal
sectional view of a state where the ultrasonic sensor according to the conventional embodiment
is attached to a bumper of a car Structure diagram of bottomed cylindrical case of ultrasonic
sensor according to the embodiment of the invention Structure of bottomed cylindrical case of
ultrasonic sensor according to the embodiment of the prior art Pin of ultrasonic sensor according
to the embodiment of the invention Figure showing the pressed-in state viewed from above a
schematic diagram representing the reverberation time of the ultrasonic sensor according to the
embodiment of the present invention a schematic diagram representing the reverberation time of
the ultrasonic sensor according to the conventional embodiment
Explanation of sign
[0011]
DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Bottomed cylindrical case 3 Sound
absorbing material 4 Sealant 5a Input-output lead 5b Input-output lead 6 Parallel pin 7 Car
bumper
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