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JP2016063351

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2016063351
Abstract: The present invention provides an ultrasonic device that can be manufactured with a
small number of steps and has less product variation during manufacturing, and an ultrasonic
sensor using the same. An ultrasonic device includes a case, a lid covering an opening of the case,
a piezoelectric element provided on a wall surface inside the case, a lead wire electrically
connected to the piezoelectric element, and a lead wire. An ultrasonic device comprising: a
terminal pin having a connecting portion to be connected and provided through the lid; and the
terminal pin connecting portion has a sandwiching structure. [Selected figure] Figure 1
Ultrasonic device and ultrasonic sensor using the same
[0001]
The present specification relates to an ultrasonic device for transmitting and / or receiving
ultrasonic waves, and an ultrasonic sensor using the same.
[0002]
A conventional ultrasound device 1 is shown in FIG.
The conventional ultrasonic device 1 includes a piezoelectric element 5 disposed inside a cavity 4
formed by the case 2 and the lid 3, a pair of lead wires 6 connected to the piezoelectric element
5, and the lid 3. It has a pair of fixed terminal pins 7 and a solder 8 for connecting the lead wires
6 and the terminal pins 7. One of the lead wires 6 is directly connected to one of the electrodes
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of the piezoelectric element 5. The other electrode of the piezoelectric element 5 is connected to
the inner wall surface of the case 2 made of a conductor, and the other of the lead wire 6 is
connected to the other electrode of the piezoelectric element 5 via the case 2. In addition, as
prior art document information of this application, patent document 1 is known, for example.
[0003]
JP-A-11-266498
[0004]
The conventional ultrasonic device 1 soldered and connected the lead wire 6 and the terminal
pin 7 in the cavity 4 for echoing the ultrasonic wave, but it is difficult to mechanize because it
works in a narrow space, I had to rely on manual work.
However, manual soldering requires man-hours, and there is variation in the amount of adhesion
of the solder 8 between products, and variation in the transmission and reception characteristics
of ultrasonic waves is large. Therefore, much time is required for the adjustment operation for
adjusting the variation of the transmission and reception characteristics. An object of the present
invention is to provide an ultrasonic device that can be manufactured with a small number of
steps.
[0005]
The ultrasonic device according to the present invention includes a case, a lid covering the
opening of the case, a piezoelectric element provided on a wall surface inside the case, a lead
wire electrically connected to the piezoelectric element, and a lead wire And a terminal pin
provided through the lid, and the connection portion of the terminal pin has a sandwiching
structure.
[0006]
With the above configuration, the ultrasonic device of the present invention can be manufactured
with a small number of steps.
[0007]
Cross-sectional view of the ultrasonic device in the embodiment Manufacturing step of the main
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part of the ultrasonic device in the embodiment Cross-sectional view of the ultrasonic sensor in
the embodiment Cross-sectional view of a conventional ultrasonic device
[0008]
FIG. 1 is a cross-sectional view of the ultrasonic device 11 according to the present embodiment,
and FIG. 2 (e) is an enlarged view of components of the portion A of the ultrasonic device 11 of
FIG.
In the present specification, the ultrasonic device 11 means a device that transmits and / or
receives ultrasonic waves.
[0009]
In FIGS. 1 and 2E, the ultrasonic device 11 includes a case 12, a lid 15 that covers the opening
13 of the case 12 and forms a cavity 14 inside the case 12, and the inner wall surface 16 of the
case 12. It has a piezoelectric element 17 provided, a pair of lead wires 18 electrically connected
to the piezoelectric element 17, and a pair of terminal pins 19 connected to the pair of lead wires
18 and provided through the lid 15. .
[0010]
The piezoelectric element 17 has a flat plate-like piezoelectric layer made of a piezoelectric
material such as PZT, and a pair of electrodes stacked on the flat surface of both sides of the
piezoelectric layer.
[0011]
The case 12 is made of metal such as aluminum, for example, and has a bottomed cylindrical
shape.
The piezoelectric element 17 is bonded to the inner bottom surface of the case 12 using an
adhesive or the like, and the inner bottom surface of the case 12 plays a role of an ultrasonic
vibration surface.
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In addition, the outer surface of the case 12 can be covered with an insulating protective film.
[0012]
One electrode of the piezoelectric element 17 is electrically connected to one of the lead wires 18
using an adhesive or a molten solder or the like.
The other electrode of the piezoelectric element 17 is electrically connected to the conductor
portion inside the case 12, and the conductor portion inside the case 12 is electrically connected
to the other lead wire 18 via the joint portion 28. Ru.
The joint portion 28 is formed, for example, by welding, bonding, or soldering, or a conductive
adhesive. Then, one and the other lead wires 18 are respectively connected to one and the other
terminal pins 19 which become external input / output terminals.
[0013]
Note that only one lead wire 18 may be used. That is, the other terminal pin 19 may be
connected to the case 12 outside the case 12 without using the other lead wire 18 connected to
the conductor portion inside the case 12. Further, only one terminal pin 19 may be used. That is,
instead of the other terminal pin 19, the conductor portion of the outer surface of the case 12
may be used as an external input / output terminal of the ultrasonic device 11.
[0014]
The lid 15 is made of, for example, an insulator such as resin, covers the opening 13 of the case
12, and forms a cavity 14 inside the case 12. The lid 15 also has a through hole 20 through
which the terminal pin 19 is provided.
[0015]
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The cavity 14 is a space for echoing ultrasonic waves that oscillate or receive. In addition, you
may provide the shock absorbing material (not shown) for suppressing a reverberation inside the
cavity 14. As shown in FIG. Also, a filler (not shown) may be provided inside the cavity 14 for
filling a part of the cavity 14, and an inlet (not shown) for injecting the filler (not shown) in the
lid 15 (Not shown) may be provided. In addition, in order to seal the cavity 14, a sealing material
(see FIG. 1) for sealing a gap between the through hole 20 and the terminal pin 19 and an inlet
(not shown) for injecting a filler (not shown). Not shown) may be provided.
[0016]
The piezoelectric element 17 is an ultrasonic transducer that receives and / or transmits
ultrasonic waves, and emits an ultrasonic wave by vibrating according to an input signal, or
outputs an output signal according to received ultrasonic vibration. Output.
[0017]
The lead wire 18 is a wire for electrically connecting the piezoelectric element 17 and the
terminal pin 19 in the cavity 14.
The lead 18 is flexible so that the mechanical resistance to the vibration of the piezoelectric
element 17 is reduced. The lead 18 is more mechanically flexible than the terminal pin 19. The
lead 18 is made of, for example, a stranded copper wire. The lead wire 18 and the terminal pin
19 are crimped to each other at the connection portion 21. The tip 22 of the lead wire 18 is
protruded from the connection portion 21 toward the lid 15 so that it can be confirmed that the
lead wire 18 having a sufficient length is held in the connection portion 21.
[0018]
The terminal pin 19 has a columnar portion 23 having a cylindrical shape, a connection portion
21 connected to the lead wire 18, and a positioning portion 24 for positioning the lid 15. The
columnar portion 23 further includes a terminal portion 25 protruding to the outside from the
through hole 20 of the lid 15.
[0019]
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The terminal pin 19 is not only an external input / output terminal of the ultrasonic device 11
but also a support member for fixing the ultrasonic device 11 to an external wiring board or the
like, and has mechanical strength against deformation than the lead wire 18 strong.
[0020]
A surface metal 26 made of a metal having a melting point lower than that of the internal metal
of the terminal pin 19 is provided on the surface of the terminal pin 19 in the connection portion
21.
As the surface metal 26, for example, molten solder plating, electrolytic solder plating,
electrolytic tin plating, or the like can be used. The surface metal 26 may be provided at least on
the connection portion 21 of the terminal pin 19 with the lead wire 18, but may be provided so
as to cover the entire surface of the terminal pin 19. When the surface metal 26 is provided on
the entire surface of the terminal pin 19, the solderability of the terminal portion 25 can be
improved at the same time.
[0021]
After the terminal pin 19 and the lead wire 18 are crimped and joined, the connection portion 21
is heated to melt the surface metal 26 of the terminal pin 19 and to be melted and joined to the
metal surface of the lead wire 18. The surface metal 26 for fusion bonding may be provided on
the surface of the lead wire 18 instead of being provided on the surface of the terminal pin 19. In
addition, surface metal 26 for fusion bonding may be provided on the surface of both terminal
pin 19 and lead wire 18.
[0022]
The terminal pin 19 penetrates the columnar portion 23 into the through hole 20 of the lid 15
and brings the positioning portion 24 into contact with the lid 15 for positioning and fixing. The
positioning portion 24 is a protrusion that protrudes in the side direction more than the outer
surface of the columnar portion 23. The positioning portion 24 may have a flange shape.
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[0023]
Next, the process of connecting the terminal pin 19 and the lead wire 18 will be described. FIGS.
2A to 2E are diagrams for explaining the process of connecting the terminal pin 19 and the lead
wire 18.
[0024]
First, as shown in FIG. 2A, the terminal pin 19 before processing is prepared. The internal metal
of the terminal pin 19 is a steel or copper material, and has a surface metal 26 at a portion
connected to the lead wire 18. The surface metal 26 is a solder film formed by electrolytic solder
plating.
[0025]
Next, the tip end portion of the terminal pin 19 is pressed to form a wide surface portion 27 as
shown in FIG. The portion not to be pressed is the columnar portion 23, the wide surface portion
27 is thinner than the columnar portion 23, and the surface area per unit length in the axial
direction of the terminal pin 19 is large.
[0026]
Next, as shown in FIG. 2C, the lead wire 18 is disposed on the wide surface portion 27 of the
terminal pin 19. At this time, the tip 22 of the lead wire 18 is disposed at a position projecting
from the connection portion 21.
[0027]
Next, as shown in FIG. 2D, the wide surface portion 27 of the terminal pin 19 is crimped so as to
sandwich the lead wire 18. By this process, the terminal pin 19 and the lead wire 18 are crimped
and joined to form the connection portion 21. At this time, the base side portion of the wide
surface portion 27 in the terminal pin 19 is removed from the caulking process and used as a
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positioning portion 24 protruding in the side direction.
[0028]
Next, as shown in FIG. 2E, the connection portion 21 is heated, the surface metal 26 of the
terminal pin 19 is melted, and the terminal pin 19 and the lead wire 18 are melted and
connected. Here, as a method of performing fusion connection using surface metal 26, you may
use methods, such as resistance welding and arc welding, besides heating and melting. The
terminal pin 19 thus connected to the lead wire 18 is passed through the through hole 20 of the
lid 15 to assemble the ultrasonic device 11.
[0029]
The ultrasonic device 11 is attached to, for example, sensors mounted on the front and rear of a
vehicle, transmits an ultrasonic wave corresponding to an input signal, receives a reflected wave
coming back from an obstacle and outputs an output signal corresponding thereto Are used to
detect the presence or absence of an obstacle or to determine the distance from the vehicle to the
obstacle.
[0030]
As described above, the ultrasonic device 11 is electrically connected to the case 12, the lid 15
covering the opening 13 of the case 12, the piezoelectric element 17 provided on the wall
surface 16 inside the case 12, and the piezoelectric element 17 The connection portion 21 of the
terminal pin 19 has a sandwiching structure. The connection portion 21 has the connection
portion 21 connected to the connection portion 21 and the terminal pin 19 provided through the
lid 15.
With this configuration, it is possible to automate the work of connecting the lead wires 18 and
the terminal pins 19 even in a narrow work space, so it is possible to manufacture the ultrasonic
device 11 with a small number of steps. . In addition, since the work can be automated, the
connection quality between the lead wire 18 and the terminal pin 19 is stabilized, and the
variation in the ultrasonic wave transmission / reception characteristics due to the variation in
the amount of solder adhesion is reduced. Also, it takes less time for adjustment work to adjust
this.
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[0031]
Moreover, by forming the sandwiching structure by caulking, the operation can be further
simplified, and the number of manufacturing steps can be reduced.
[0032]
Further, in the connection portion 21, the connection quality can be further stabilized by fusion
bonding the surface metal 26 of at least one of the lead wire 18 and the terminal pin 19 to the
surface of the other metal.
[0033]
In addition, by forming a metal having a melting point lower than that of the internal metal by
plating, the surface metal 26 can reduce variations in thickness of the surface metal 26 and make
it possible to homogenize the manufacturing quality and facilitate melt bonding. It can be done.
[0034]
Further, by providing the positioning portion 24 for positioning between the lid 15 and the
connection portion 21 in the terminal pin 19, the length of the terminal pin 19 in the inside of
the cavity 14 can be made uniform. The characteristics of the acoustic wave device 11 can be
made uniform.
[0035]
The terminal pin 19 has a columnar portion 23 and a wide surface portion 27. The wide surface
portion 27 has a larger surface area per unit length in the axial direction than the columnar
portion 23, and the terminal pin 19 is a lead wire using the wide surface portion 27. By
sandwiching 18, the process of connecting the terminal pin 19 and the lead wire 18 can be easily
automated.
[0036]
Further, the terminal pin 19 has a positioning portion 24 for positioning between the lid 15 and
the connection portion 21, and the positioning portion 24 is formed using a part of the wide
surface portion 27 so that the positioning portion 24 is separately provided. The positioning
portion 24 can be formed with a small number of steps without providing a forming process or a
member, and the characteristics of the ultrasonic device 11 can be made uniform.
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[0037]
Further, by projecting the tip 22 of the lead wire 18 from the connection portion 21 to the lid 15
side, the length of the connection portion 21 can be secured at a certain level, and the connection
quality can be stabilized. In addition, it can be easily confirmed that the length of the connection
portion 21 can be secured.
[0038]
Further, the lead 18 is a stranded wire, the terminal pin 19 is a metal, and the mechanical
flexibility of the lead 18 is made higher than that of the terminal pin 19. The mechanical load can
be reduced, and variations in the ultrasonic wave transmission / reception characteristics of the
ultrasonic device 11 can be reduced.
[0039]
FIG. 3 shows an ultrasonic sensor 30 using the ultrasonic device 11 in the present embodiment.
In FIG. 3, the ultrasonic sensor 30 has an exterior body 31 and a connector portion 32.
The exterior body 31 has the ultrasonic device 11 in the opening, and the wiring board 33 in the
inside.
The connector portion 32 has a connector terminal 34 inside.
The ultrasonic device 11 and the connector terminal 34 are connected to the wiring board 33,
and the wiring board 33 is mounted with an electronic component 35 for performing signal
processing such as IC.
The ultrasonic sensor 30 is attached to, for example, the front, rear, left, and right of the vehicle,
and detects the presence or absence of an object around and the distance to the object.
[0040]
The ultrasonic sensor 11 can reduce the number of manufacturing steps because it is possible to
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use the ultrasonic device 11 with a small number of manufacturing steps and few manufacturing
variations.
[0041]
In the above embodiment, terms that indicate directions such as upper , lower , upper
surface , lower surface , etc. indicate relative directions that depend only on the relative
positional relationship of the component parts, such as vertical directions, etc. It does not
indicate an absolute direction.
[0042]
The ultrasonic device and ultrasonic sensor according to the present invention are useful as a
detector for detecting an object present near, for example, a vehicle.
[0043]
11 ultrasonic device 12 case 13 opening 14 cavity 15 lid 16 wall surface 17 piezoelectric
element 18 lead wire 19 terminal pin 20 through hole 21 connection portion 22 tip 23 columnar
portion 24 positioning portion 25 terminal portion 26 surface metal 27 wide surface portion 28
joint portion Reference Signs List 30 ultrasonic sensor 31 exterior body 32 connector portion 33
wiring board 34 connector terminal 35 electronic component
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