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DESCRIPTION JP2007281975

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DESCRIPTION JP2007281975
PROBLEM TO BE SOLVED: To provide to the market a high performance sensor with high sound
pressure sensitivity and stable resonance characteristics in a conventional ultrasonic transducer,
and precisely processed a bottomed cylindrical case of metal such as aluminum. Since the cost of
manufacturing is high and the price of the sensor product itself can not be lowered, the price of
the back sensor system is raised, and there is a problem that the spread is quite difficult except
for high grade cars. In an ultrasonic transducer, the bottomed cylindrical case is formed of a high
hardness material such as epoxy, thereby reducing the cost of the sensor while maintaining the
conventional performance such as sound pressure sensitivity. Can provide the market with an
ultrasonic transducer. [Selected figure] Figure 1
Ultrasonic transducer
[0001]
The present invention relates to an ultrasonic transducer that transmits and receives ultrasonic
frequency bands.
[0002]
In the ultrasonic transducer according to the conventional embodiment, when the ultrasonic
transducer is embedded in the bumper of a car or the like and it is intended to detect an obstacle
around the car, the pulse transmitter is used for the ultrasonic transducer. By inputting a signal,
an ultrasonic transducer corresponding to the input pulse burst electric signal is oscillated from
the ultrasonic transducer, and the oscillated ultrasonic signal reaches an obstacle and an
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ultrasonic signal hits the obstacle. Is reflected by the obstacle and a portion of the reflected
ultrasound signal returns to the same ultrasound transducer.
The ultrasonic transducer detects an obstacle by receiving the reflected signal. FIG. 4 shows a
schematic longitudinal sectional view of an ultrasonic transducer according to the conventional
embodiment. In FIG. 4, 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
oscillator. The input / output leads 5a and the input / output leads 5b are taken out by soldering
or the like from the opposite surface of the surface of the piezoelectric element 1 to which the
bottomed cylindrical case 6 is attached. The bonding surface side of the piezoelectric element 1
with the bottomed cylindrical case 6 and the bottomed cylindrical case 2 are electrically
connected, and the piezoelectric element 1 and the input / output lead 5 a and the bottomed
cylindrical case 6 are further connected. 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 then the sealing agent 4 made of silicon
material, urethane material or the like is filled in the bottomed cylindrical case 6 from above. Do.
In the ultrasonic transducer according to the conventional embodiment, a metal such as
aluminum is usually used to stably obtain high sound pressure sensitivity with stable resonance
characteristics, but it is costly in producing a bottomed cylindrical case, There is a problem of
raising the price of the sensor system. Patent publication 2001-78296 By Takumi Takushi
"Ultrasonic wave and how to use it-ultrasonic transducer, ultrasonic motor" The Nikkan Kogyo
Shimbun 1994
[0003]
The problem to be solved is that although it is necessary to manufacture a metal closed-end
cylindrical case with high processing accuracy for higher performance, manufacturing of the
closed-end cylindrical case is costly and the cost of the sensor is low. The price of the back
sensor system is high and the spread to the market is limited.
[0004]
An ultrasonic transducer that constitutes a unimorph transducer by bonding a piezoelectric
element to the inside of the bottom surface of a bottomed cylindrical case, and transmits and
receives ultrasonic waves on the case outer surface of the vibrator. Mold the case with an epoxy
resin and lower the cost of the product by using an inexpensive case.
[0005]
Since the present invention can provide high performance and inexpensive sensors to the back
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sensor market, it can lower the price of the obstacle detection system itself such as the back
sensor system, and it can be adopted even in Great vehicles which could not be mounted up to
now. Can be expected.
[0006]
An inexpensive sensor can be provided while maintaining performance by using an epoxy-based
molding resin for a bottomed cylindrical case conventionally made of a metal such as aluminum.
[0007]
1 and 2 show a schematic longitudinal sectional view and a top view of an ultrasonic transducer
according to an embodiment of the present invention.
In FIGS. 1 and 2, the piezoelectric element 1 is bonded to the inside of the bottom of a bottomed
cylindrical case 2 made of a molding resin such as epoxy resin to form a unimorph vibrator.
The surface opposite to the adhesive surface side of the piezoelectric element 1 with the
bottomed cylindrical case 2 and the surface of the piezoelectric element 1 with the input / output
lead 5a, and the surface of the piezoelectric element 1 with the bottom surface of the cylindrical
case 2 Solder the input / output lead 5b from 1 and take it out.
The piezoelectric element 1 and the input / output leads 5a and 5b are electrically connected.
The sound absorbing material 3 made of foamed silicon or the like is placed on the upper surface
of the piezoelectric element 1, and the sealing agent 4 made of silicon material, urethane material
or the like is filled in the bottomed cylindrical case 2 from above. FIG. 3 shows a schematic
longitudinal sectional view and a top view of an ultrasonic transducer according to another
embodiment of the present invention. In FIG. 3, the piezoelectric element 1 is bonded to the
inside of the bottom of a bottomed cylindrical case 7 metal-plated of an epoxy-based molding
resin to form a unimorph vibrator. The surface opposite to the adhesive surface side of the
piezoelectric element 1 with the bottomed cylindrical case 7 from the piezoelectric element 1 to
the input / output lead 5a, and the adhesive surface side with the bottom cylindrical case 7 of the
piezoelectric element 1 and the bottomed cylindrical case 7 Are electrically connected, and the
piezoelectric element 1 and the input / output lead 5a, and the bottomed cylindrical case 7 and
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the input / output lead 5b are electrically connected. Further, the bottomed cylindrical case 7 of
the piezoelectric element 1 and the input / output lead 5b are taken out by soldering or the like.
The piezoelectric element 1 and the input / output leads 5a and 5b are electrically connected.
The sound absorbing material 3 made of foamed silicon or the like is placed on the upper surface
of the piezoelectric element 1, and the sealing agent 4 made of silicon material, urethane material
or the like is filled in the bottomed cylindrical case 7 from above.
[0008]
The present invention can be applied not only to a vehicle back sensor but also to various fields
in which a drip-proof ultrasonic transducer is used.
[0009]
A schematic vertical sectional view of an ultrasonic transducer according to an embodiment of
the present invention, a top view A schematic longitudinal sectional view of an ultrasonic
transducer according to another embodiment of the present invention, and a top view another
embodiment of the present invention Schematic longitudinal sectional view of an ultrasonic
transducer related to the form of the present invention, a top view schematic longitudinal
sectional view of an ultrasonic transducer related to a conventional embodiment, and a top view
Explanation of sign
[0010]
DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Resin-made bottomed cylindrical case 3
Sound absorption material 4 Sealing material 5a Input-output lead 5b Input-output lead 6 Metalmade bottomed cylindrical case 7 Metal-plated resin-made bottomed cylindrical case
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