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JPH05328497

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DESCRIPTION JPH05328497
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transducer used for detecting a human body disposed near an automatic door or as a
back sensor in an automobile.
[0002]
2. Description of the Related Art Conventionally, as an ultrasonic transducer of this type, as
shown in FIG. 6, a piezoelectric sounding body 1 referred to as a unimorph transducer and a
piezoelectric element 1a and a metal plate 1b are integrally bonded. An additional resonator 2
attached to the upper central portion of the upper surface of the metal plate 1b and a projection
3 for supporting the lower peripheral portion of the piezoelectric element 1a located below the
piezoelectric sounding body 1 are formed. There is a type provided with a base 4 made of
insulating resin, and a case 5 made of resin or the like which encloses the upper space of the
base 4 and which houses the piezoelectric sounding body 1 and the additional resonator 2. The
additional resonator 2 is formed into an upwardly-expanding funnel shape by punching out an
aluminum plate or the like, and the funnel apex portion 2a is joined onto the metal plate 1b using
an adhesive (not shown). It is done. Further, the piezoelectric element 1 a constituting the
piezoelectric sounding body 1 and the projection 3 of the base 4 are joined via the elastic
adhesive 6.
[0003]
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1
On the other hand, metal round rod-like terminal pins 7, 7 penetrating the base 4 along the
thickness direction are attached, and each of the terminal pins 7, 7 and the piezoelectric element
1a and the metal plate 1b are mutually attached It is connected via leads 8 and 8. That is, each of
the lead wires 8, 8 whose one end is soldered to each of the piezoelectric element 1a and the
metal plate 1b passes through a notch (not shown) formed at a predetermined position of the
base 4 The other end of each lead wire 8 is soldered and wound around the upper end located
outside of each terminal pin 7. Furthermore, on the other end of each soldered lead wire 8 is
applied a silicon adhesive (not shown) for protecting the soldered portion, while the other lead
wires 8 pass A silicon adhesive is applied to the inside of the notched portion in order to
suppress unnecessary vibration of the lead wire 8.
[0004]
Furthermore, in the case 5 surrounding the upper space of the base 4, a sound release hole 9 is
formed at a position facing the upper open surface of the additional resonator 2, and the case 5
is formed on the outer peripheral end face of the base 4. It is attached by being fitted outside
along. The inner peripheral surface of the case 5 and the peripheral edge of the lower surface of
the base 4 are joined using an adhesive (not shown) applied over the entire circumference of the
contact portion of the two. At this time, it is common to form on the inner peripheral surface of
the case 5 a protrusion 5 a or a stepped portion (not shown) positioned to be in contact with the
upper surface of the base 4. .
[0005]
By the way, in the conventional ultrasonic transducer, the other ends of the lead wires 8, 8 are
wound around the terminal pins 7, 7 several times. Although soldering is performed, the reason
for doing this is that the ultrasonic transducer is disposed since the soldering of the lead wire 8
to each of the round terminal pins 7 is likely to be uncertain. This is to prevent the lead wires 8
and 8 from being detached from the terminal pins 7 and 7 under the influence of soldering of the
lead wires 8 and 8 to the printed circuit board or the like. However, if the lead wires 8, 8 are
purposely wound separately in this manner, extra effort and time will be required. In addition,
when bonding the base 4 and the case 5 as well, the adhesive is applied over the entire
circumference between the two, but this requires more labor and time, and at least As a result,
the assembly efficiency is reduced, which results in an increase in the cost required for assembly.
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2
[0006]
The present invention has been made in view of these problems, and it is possible to save labor
and time required for assembly, and to provide an ultrasonic transducer capable of improving
assembly efficiency and reducing cost. It is an object.
[0007]
SUMMARY OF THE INVENTION In order to achieve such an object, the present invention
provides a base, a piezoelectric sounding body mounted on the base, and an additional resonator
mounted on the piezoelectric sounding body. And an ultrasonic transducer including a
piezoelectric sounding body and an additional resonator, and a case attached to the base and a
terminal pin attached to the base, each of the terminal pins using a metal plate The upper end of
each terminal pin is provided with a flat portion which extends along the thickness direction of
the base and which extends toward the outer peripheral end face of the base. It is.
Here, the outer end edge of the flat portion provided on the terminal pin is projected from the
outer peripheral end face of the base toward the inner peripheral surface of the case, and the
outer end edge of the flat portion is formed on the inner peripheral surface of the case. A guide
may be provided to guide along the thickness direction of the base.
[0008]
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
FIG. 1 is a cross-sectional view showing a schematic structure of an ultrasonic transducer
according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view
thereof, and FIG. 3 is a perspective view showing an external shape of a terminal pin used
therein. FIGS. 4 and 5 are perspective views showing modified examples of the terminal pin.
The overall configuration of this ultrasonic transducer is basically the same as that of the
conventional example, so the same reference numerals as in FIG. 6 showing the conventional
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3
example in FIGS. 1 and 2 denote the same or corresponding parts. ing.
[0010]
As shown in FIG. 1 and FIG. 2, this ultrasonic transducer has a piezoelectric sounding body 1 in
which a piezoelectric element 1a and a metal plate 1b are integrally bonded together, and a
central portion of the upper surface of the metal plate 1b located above it. An attached upper
spreading funnel-shaped additional resonator 2, a base 4 supporting the lower surface peripheral
portion of the piezoelectric element 1a positioned below the piezoelectric sounding body 1 via
the projection 3, and an upper space of the base 4 The piezoelectric sounding body 1 disposed
inside and the case 5 for incorporating the additional resonator 2 are provided, and a pair of
terminal pins 10, 10 are attached to the base 4 along the thickness direction thereof. ing. As
shown in FIG. 3, each of the terminal pins 10 is formed by using a metal plate of a predetermined
thickness, and the upper end of each terminal pin 10 located within the thickness of the base 4 is
A flat plate portion 11 having a shape which is expanded along the thickness direction of the
base 4 and is expanded toward the outer peripheral end face of the base 4 to which the case 5 is
externally fitted is provided.
[0011]
Further, here, each terminal pin 10 and the piezoelectric sounding body 1 are separately
connected through the lead wires 8 and 8, and a lead whose one end is connected to each of the
piezoelectric element 1a and the metal plate 1b The other end of each of the wires 8 and 8 is
soldered to the flat portion 11 of each terminal pin 10. Then, on the other end of each soldered
lead wire 8, a silicon adhesive (not shown) for protecting the soldered portion is applied. That is,
in the present embodiment, since the terminal pin 10 is formed of a metal plate and the flat plate
portion 11 is provided at the upper end portion thereof, the other end portion of the lead wire 8
with respect to the flat plate portion 11 is It becomes possible to solder reliably. In addition, in
this FIG. 3, although the whole of the terminal pin 10 shall be formed from the metal plate which
has fixed thickness, it is not limited to this, For example, as each shown in FIG.4 and FIG.5, Of
course, the cross-sectional shape of the leg portion of the terminal pin 10 excluding the flat plate
portion 11 may be substantially L-shaped or substantially circular.
[0012]
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4
Furthermore, in this embodiment, the outer edge 11a of the flat plate portion 11 provided on
each of the terminal pins 10, 10 is projected from the outer peripheral end face of the base 4
toward the inner peripheral surface of the case 5, while the base A guide portion 12 is provided
on the inner peripheral surface of the case 5 facing the outer peripheral end face 4 to guide the
outer end edge portion 11 a of the flat plate portion 11 along the thickness direction of the base
4. Further, as is apparent from FIG. 2, the guide portion 12 is constituted by a pair of ridges
arranged in parallel at a predetermined interval corresponding to the thickness of the flat plate
portion 11 of each terminal pin 10. These protrusions may be formed integrally with the case 5
or may be separately formed and then fixed.
[0013]
Therefore, the other end of the lead wire 8 is soldered on the outer end edge 11a of each of the
flat plate portions 11 and 11 projecting from the outer peripheral end face of the base 4, and a
silicon adhesive is applied on the soldering portion. In addition, when the base 4 is inserted into
the case 5, each outer edge 11a is guided by the guide 12 and joined to the guide 12 through the
silicon adhesive. As a result, the case 4 and the base 4 on which the piezoelectric sounding body
1 and the additional resonator 2 are disposed are joined and integrated with each other.
[0014]
By the way, a plurality of terminal pins 10 in the above description are integrated in advance so
as to form a so-called hoop shape, and the base 4 is formed by insert molding for each pair of
terminal pins 10, 10 arranged adjacent to each other. In this case, there is an advantage that the
assembly of the ultrasonic transducer can be made continuous.
[0015]
As described above, according to the ultrasonic transducer according to the present invention,
the terminal pin is formed using a metal plate, and the upper end of the terminal pin located
within the thickness of the base is formed. Since the flat plate portion is provided, it becomes
possible to solder the lead wire securely to the flat plate portion, and the lead wire may be
detached from the terminal pin without winding the lead wire to each terminal pin. As a result,
the labor and time required for the winding operation of the lead wire can be saved.
Further, according to the present invention, since the base and the case are joined through the
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flat portion of the terminal pin, it is necessary to apply the adhesive over the entire
circumference between the base and the case as in the prior art. It is possible to reduce the time
and effort. Therefore, it is possible to improve the assembly efficiency of the ultrasonic
transducer and reduce the cost.
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