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DESCRIPTION JP2010118958

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DESCRIPTION JP2010118958
[PROBLEMS] In a preamplifier module using an ultrasonic transducer for transmitting and
receiving an ultrasonic frequency band, the arrangement of input and output leads is complicated
and hinders automation. A preamplifier module using an ultrasonic transducer, in which a
piezoelectric element is bonded inside a bottom surface of a bottomed cylindrical case to form a
unimorph transducer, and ultrasonic waves are transmitted and received by the vibration of the
unimorph transducer. When electrically connecting the circuit board and the ultrasonic
transducer, a metal terminal embedded in the housing is provided, and the electronic circuit
board and the ultrasonic transducer are electrically connected through the metal terminal. It is
possible to assemble, and provide a preamp module using a less expensive ultrasonic transmitterreceiver. [Selected figure] Figure 1
Ultrasonic transducer
[0001]
The present invention relates to a preamplifier module using an ultrasonic transducer for
transmitting and receiving ultrasonic frequency bands.
[0002]
In the ultrasonic transducer related to the conventional embodiment, in the case of embedding it
in the bumper of a car and installing it and detecting an obstacle around it, the pulse burst
electric signal is input to the ultrasonic transducer to An ultrasonic signal corresponding to the
input pulse burst electric signal is oscillated from the ultrasonic transducer, and the oscillated
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ultrasonic signal reaches an obstacle and then is reflected by the obstacle, and a part of the
ultrasonic signal is the same. Return to the ultrasonic transducer.
The ultrasonic transducer detects an obstacle by receiving the reflected signal. FIG. 3 shows a
schematic longitudinal sectional view of a preamplifier module using an ultrasonic transducer
according to the conventional embodiment. In FIG. 3, the piezoelectric element 1 is fixed 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. In the piezoelectric element 1, silver electrodes are taken out from the
back surface in a folded structure, and two electrodes are disposed on one surface. Input / output
leads 5a and 5b are soldered to these silver electrodes and taken out. The input and output leads
5a and 5b are respectively soldered to the wire 6 of the connector 7 with a PVC coated wire. The
sound absorbing material 3 made of silicone foam or the like is placed on the upper surface of
the piezoelectric element 8, and the sealing agent 4 made of an elastic material such as a silicone
material or urethane material is filled into the bottomed cylindrical case 2. This is fixed to a
housing 9 made of PBT resin or the like by a cushion 10 made of elastic resin. The terminals of
the connector 7 are soldered or the like to the appropriate pattern of the substrate 11 on which
the electronic circuit is mounted and electrically connected. A wire 13 for connecting to a
controller is provided, and is sealed with a sealant 12 made of urethane or the like to constitute a
preamplifier module. FIG. 4 shows a schematic longitudinal sectional view of a preamplifier
module using another ultrasonic transducer according to the conventional embodiment. In FIG. 4,
the piezoelectric element 1 is fixed 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. In the piezoelectric
element 1, silver electrodes are taken out from the back surface in a folded structure, and two
electrodes are disposed on one surface. Input / output leads 5a and 5b are soldered to these
silver electrodes and taken out. This is fixed to a housing 9 made of PBT resin or the like by a
cushion 10 made of elastic resin. The input / output leads 5a and 5b are soldered to the silver
electrode of the piezoelectric element and taken out. A sound absorbing material 3 made of
silicone foam or the like is placed on the upper surface of the piezoelectric element 1, and then a
sealant 4 made of an elastic material such as a silicone material or a urethane material is filled in
the bottomed cylindrical case 2. The input / output leads 5a and 5b are soldered or the like to
the appropriate pattern of the substrate 11 on which the electronic circuit is mounted and
electrically connected. A wire 13 for connecting to a controller is provided, and is sealed with a
sealant 12 made of urethane or the like to constitute a preamplifier module. Conventionally, in an
ultrasonic transmitter-receiver, it is necessary to draw a long wire as a method of electrically
connecting a substrate carrying an input / output lead and an electronic circuit, and manual
assembly is necessary. However, automation is difficult and cost is reduced It is a hindrance.
Koji Taniyoku "Ultrasonic waves and how to use them-Ultrasonic transducer / Ultrasonic motor"
The Nikkan Kogyo Shimbun 1994
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[0003]
In a preamplifier module using an ultrasonic transducer for transmitting and receiving an
ultrasonic frequency band, a long wire is used as a method of electrically connecting an input /
output lead taken out of the ultrasonic transducer and a substrate carrying an electronic circuit.
Need to be handed out, manual assembly is required, automation is difficult, and this is an
obstacle to cost reduction.
[0004]
A piezoelectric element is bonded to the inside of the bottom of the bottomed cylindrical case to
form a unimorph transducer, and a preamplifier module using an ultrasonic transducer that
transmits and receives ultrasonic waves by the vibration of the unimorph transducer is partially
included in the housing By providing a metal terminal embedded in the board and electrically
connecting the electronic circuit board and the ultrasonic transducer via this, productivity is
increased and automation is also possible.
[0005]
The present invention has the advantage of being able to provide a preamplifier module using an
ultrasonic transducer, which is easy to automate and inexpensive, using a ultrasonic transducer.
[0006]
When used as a vehicle corner sensor or the like, it can be embedded in a bumper or the like to
realize stable obstacle detection up to a short distance with high reliability and low cost without
malfunction.
[0007]
FIG. 1 shows a schematic cross-sectional view of a preamplifier module using an ultrasonic
transducer according to an embodiment of the present invention at the top, and a plan view from
the top through a substrate 11 on which electronic components are mounted.
In FIG. 1, the piezoelectric element 1 is fixed 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.
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In the piezoelectric element 1, silver electrodes are taken out from the back surface in a folded
structure, and two electrodes are disposed on one surface.
This is fixed to a housing 9 made of PBT resin or the like by a cushion 10 made of elastic resin.
The input / output leads 5a and 5b are soldered to the silver electrode of the piezoelectric
element and taken out. These input / output leads are connected to the metal terminals 16a and
16b embedded in the housing 9 by soldering or the like. The sound absorbing material 3 made of
silicone foam or the like is placed on the upper surface of the piezoelectric element 8, and the
sealing agent 4 made of an elastic material such as a silicone material or urethane material is
filled into the bottomed cylindrical case 2. The substrate 11 on which the electronic circuit
provided with the through holes 8 in advance is mounted at the positions of the embedded metal
terminals 16a and 16b provided in the housing, and is electrically connected to the part by
soldering etc. A terminal for connection is provided and sealed with a sealing agent 12 made of
urethane or the like to constitute a preamplifier module. FIG. 2 is a schematic cross-sectional
view of a preamplifier module using another ultrasonic transducer according to the embodiment
of the present invention at the top, and a plan view from the top through the substrate 11 on
which electronic components are mounted is shown at the bottom. In FIG. 2, the piezoelectric
element 1 is fixed 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. In the piezoelectric element 1, silver
electrodes are taken out from the back surface in a folded structure, and two electrodes are
disposed on one surface. This is fixed to a housing 9 made of PBT resin or the like by a cushion
10 made of elastic resin. The input / output leads 5a and 5b are soldered to the silver electrode
of the piezoelectric element and taken out. These input / output leads are connected to the metal
terminals 16a and 16b embedded in the housing 9 by soldering or the like. To this, for example,
a sealing agent 14 in which a foamable silicone material, a foamable urethane agent 15, a
crushed foam or the like and an elastic agent are mixed is filled. The substrate 11 on which the
electronic circuit provided with the through holes in advance is mounted at the positions of the
embedded metal terminals 16a and 16b provided in the housing, and is electrically connected to
the part by soldering etc. A terminal for connection is provided and sealed with a sealant 12
made of urethane or the like to constitute a preamplifier module. In the preamplifier module
using the ultrasonic transducer according to the conventional embodiment, the electrical
connection between the input / output leads of FIGS. 3 and 4 and the substrate on which the
electronic circuit is mounted is routed or routed in the conventional structure. Although
complicated and difficult to automate, the present invention facilitates the automation and can
provide a preamplifier module using a low cost ultrasonic transmitter-receiver.
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[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]
Schematic of bottomed cylindrical case and preamplifier module according to the embodiment of
the present invention Schematic of bottomed cylindrical case and preamplifier module according
to the embodiment of the present invention Bottomed cylindrical case according to the
conventional embodiment And a schematic view of a preamplifier module and a schematic view
of a bottomed cylindrical case and a preamplifier module according to a conventional
embodiment
Explanation of sign
[0010]
DESCRIPTION OF SYMBOLS 1 Piezoelectric element provided with folded electrode 2 Bottomed
cylindrical case 3 Sound absorbing material 4 Sealant consisting of elastic material 5 a Input /
output lead 5 b Input / output lead 6 PVC coated wire 7 Connector with PVC coated wire 8
Provided on electronic circuit board Through hole 9 Housing 10 Cushion 11 Electronic circuit
board 12 Preamp module sealant 13 Preamp module wire 14 Sealant obtained by mixing
crushed foam and elastic agent 15 Sealant 16a made of foamable elastic material Buried metal
terminal provided 16B Buried metal terminal provided in the housing
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