close

Вход

Забыли?

вход по аккаунту

?

JP2003032795

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
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
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2003032795
[0001]
【0001】 FIELD OF THE INVENTION The present invention relates to a technology for
improving the withstand voltage performance of an ultrasonic transducer.
【0003】
[0004] Conventional ultrasonic transducers used in ultrasonic ultrasonic welding of plastics,
ultrasonic bonding of metal wires, ultrasonic scalpels in medical fields, and other high-power
ultrasonic applications such as high-frequency ultrasonic equipment For example, a bolt-clamped
Langevin-type ultrasonic transducer as shown in FIG. 5 is known.
【0005】
FIG. 5 shows a typical structure of a conventional ultrasonic transducer.
【0006】
In the figure, a is a top view of the ultrasonic transducer, b is a front view of the ultrasonic
transducer, and c is a schematic view showing the structure of the ultrasonic transducer by a
partial cross section.
【0007】
In the figure, 101a and 101b are piezoelectric elements, 102a, 102b and 102c are electrode
plates, 103a and 103b are insulating plates, 104 is an insulating tube, 105 is a bolt, 106a and
04-05-2019
1
106b are metal blocks (front plate, backing plate ).
【0008】
As shown in the figure, this ultrasonic transducer includes three electrode plates 102a, 102b and
102c and two piezoelectric elements 101a interposed therebetween by metal blocks 106a and
106b through insulating plates 103a and 103b. , 101b are held. Also, the piezoelectric elements
101a and 101b and the insulating plates 103a and 103b have an annular shape having the same
diameter, and the terminal portions 121a, 121b and 21c in which the electrode plates 102a,
102b and 102c also partially protrude in the horizontal direction. Except that they have an
annular shape with the same diameter. Each metal block 106a, 106b has a substantially
cylindrical shape, and the piezoelectric element side end has the same diameter as the
piezoelectric element 101a, 101b etc., and screw holes 61, 62 are provided at the center ing.
【0009】
The three electrode plates 102a, 102b and 102c, the two piezoelectric elements 101a and 101b,
and the two insulating plates 103a and 103b are sandwiched between the two metal blocks 106a
and 106b by the insulating plate 3a, the electrode plate 102a, and the piezoelectric element
101a. This is done by screwing bolts 105 inserted in this order into the inner holes of the
electrode plate 102b, the piezoelectric element 101b, the electrode plate 102c, and the insulating
plate 103b in the screw holes 161 and 162 of the two metal blocks 106a and 106b. ing. Further,
the insulation of the bolt 105, the three electrode plates 102a, 102b, 102c and the two
piezoelectric elements 101a, 101b is realized by providing a gap and an insulating pipe 104
between the bolts 105.
【0010】
Now, in such a structure, by supplying appropriate voltage signals to the terminal portions 121a,
121b, 121c of the respective electrode plates 102a, 102b, 102c to drive the piezoelectric
elements 101a, 101b, the ultrasonic transducers are It can be vibrated in the sound wave range.
【0011】
In the ultrasonic transducer shown in FIG. 5, when a high voltage difference is given between the
electrode plates by a voltage signal to obtain a high output, a discharge between the electrode
plates is generated. May occur. And such a discharge not only causes the operation failure of the
ultrasonic transducer, but also often destroys the ultrasonic transducer itself.
【0013】
04-05-2019
2
Conventionally, in order to prevent such discharge between the electrode plates, the distance
between the electrode plates is increased by increasing the thickness of the piezoelectric element,
or a method of applying an insulating agent to the periphery supplementarily is used. It has been
taken by the Lord. However, such a method of increasing the thickness of the piezoelectric
element has not been very effective from the viewpoint of preventing discharge. The reason is
that if the thickness of the piezoelectric element is increased and the same output is to be
obtained as in the case where the thickness of the electric element is small, it is necessary to
further increase the voltage difference to be applied between the electrode plates. This is because
increasing the voltage difference between the two acts in the direction of causing the discharge.
【0014】
Then, this invention makes it a subject to provide the ultrasonic transducer | vibrator which can
prevent the discharge between electrode plates more effectively.
【0015】
In order to achieve the above object, the present invention is, for example, an annular
piezoelectric element having a central hole, an annular contact portion having a central hole, and
the circle. A terminal portion formed by projecting a part of the outer periphery of the annular
portion in the horizontal direction, and an electrode plate having the contact portion in contact
with the piezoelectric element, and an annular central hole of the piezoelectric element In the
ultrasonic transducer held between the upper and lower metal blocks, the upper and lower metal
blocks are connected by connecting the upper and lower metal blocks by the connection member
which penetrates the ring-shaped central hole of the electrode plate. The diameter of the annular
shape of the part is set smaller than the diameter of the annular shape of the piezoelectric
element.
【0017】
Thus, by making the diameter of the annular shape of the contact portion of the electrode plate
smaller than the diameter of the annular shape of the piezoelectric element, the shortest
discharge surface between the adjacent electrode plates or between the electrode plate and the
metal block The distance becomes larger than before, and the generation of discharge can be
effectively suppressed.
【0018】
Further, in order to achieve the above object, the present invention horizontally projects an
annular piezoelectric element having a central hole, an annular contact portion having a central
hole, and a part of the outer periphery of the annular portion. And an electrode plate having the
04-05-2019
3
terminal portion formed by contact and the contact portion in contact with the piezoelectric
element, the central hole of the annular shape of the piezoelectric element and the central hole of
the annular shape of the electrode plate In the ultrasonic transducer held between the pair of
upper and lower metal blocks by connecting the pair of upper and lower substantially cylindrical
metal blocks with the connecting member, the diameter of at least the piezoelectric element side
end portion of at least one metal block Is smaller than the diameter of the annular shape of the
piezoelectric element.
【0019】
Thus, by making the diameter of at least the piezoelectric element side end portion of the metal
block smaller than the diameter of the annular shape of the piezoelectric element, the metal
block is insulated by the other member such as the piezoelectric element. Since the shortest
discharge creeping distance between the electrode plate and the electrode plate is larger than
that in the prior art, the occurrence of discharge can be effectively suppressed.
【0020】
Further, in order to achieve the above object, the present invention horizontally projects an
annular piezoelectric element having a central hole, an annular contact portion having a central
hole, and a part of the outer periphery of the annular portion. And an electrode plate having the
terminal portion formed by contact and the contact portion in contact with the piezoelectric
element, the central hole of the annular shape of the piezoelectric element and the central hole of
the annular shape of the electrode plate In the ultrasonic transducer held between the upper and
lower metal blocks by connecting the upper and lower substantially cylindrical metal blocks by
the connecting member, the ultrasonic vibrator is arranged between the metal block and the
electrode plate. The insulating plate has an annular shape having a central hole penetrated by the
connection member, and the diameter of at least the piezoelectric element side end portion of at
least one of the metal blocks, and Electrode plate The diameter of the circular shape of the
contact portion is obtained by set smaller than the diameter of the annular shape of the
insulating plate.
【0021】
Thus, by setting the diameter of at least the piezoelectric element side end of the metal block and
the diameter of the annular shape of the contact portion of the electrode plate to be smaller than
the diameter of the annular shape of the insulating plate, The shortest discharge creepage
distance between the metal block and the electrode plate insulated from the metal block by the
metal block becomes larger than that in the prior art, and the occurrence of discharge can be
effectively suppressed.
04-05-2019
4
【0022】
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present
invention will be described.
【0024】
First, the first embodiment will be described.
【0025】
1 and 2 show the structure of the ultrasonic transducer according to the present embodiment.
【0026】
In the figure, a is a top view of the ultrasonic transducer, b is a front view of the ultrasonic
transducer, and c is a schematic view showing the structure of the ultrasonic transducer by a
partial cross section. FIG. 2 is a schematic view schematically showing an assembly structure of
the ultrasonic transducer.
【0027】
In the figure, 1a and 1b are piezoelectric elements, 2a, 2b and 2c are electrode plates, 3a and 3b
are insulating plates, 4 is an insulating tube, 5 is a bolt, 6a and 6b are metal blocks (front plate,
backing plate ).
【0028】
As shown in the figure, this ultrasonic transducer includes three electrode plates 2a, 2b and 2c
and two piezoelectric elements 1a sandwiched between them by metal blocks 6a and 6b through
insulating plates 3a and 3b. , 1b is held.
【0029】
The piezoelectric elements 1a and 1b and the insulating plates 3a and 3b have an annular shape
having the same diameter, and the electrode plates 2a, 2b and 2c also have terminal portions
21a, 21b and 21c partially projecting in the circumferential direction. Except that it has an
annular shape. Each metal block 6a, 6b has a substantially cylindrical shape, and screw holes 61,
62 are provided at the center of the piezoelectric element side end. Further, the terminal portions
21a, 21b and 21c of the electrode plates 2a, 2b and 2c are alternately arranged in a
circumferential direction at an angle of 180 degrees with the terminal portions of the adjacent
04-05-2019
5
electrode plates. Moreover, in the area 11 in contact with the electrode plates 2a, 2b and 2c on
both surfaces of the piezoelectric elements 1a and 1b, a conductor is deposited or deposited to
ensure good electrical contact with the electrode plates 2a, 2b and 2c. It has been applied.
【0030】
The three electrode plates 2a, 2b and 2c, the two piezoelectric elements 1a and 1b, and the two
insulating plates 3a and 3b are held by the two metal blocks 6a and 6b by the insulating plate 3a,
the electrode plate 2a, and the piezoelectric element 1a. , By screwing the bolts 5 inserted in this
order into the electrode plate 2b, the piezoelectric element 1b, the electrode plate 2c, and the
insulating plate 3b in this order into the screw holes 61 and 62 of the two metal blocks 6a and
6b. There is. Further, the insulation of the bolt 5, the three electrode plates 2 a, 2 b, 2 c and the
two piezoelectric elements 1 a, 1 b is realized by providing the insulating pipe 4 between the
bolts 5.
【0031】
Now, in such a structure, by supplying appropriate voltage signals to the terminal portions 21a,
21b, 21c of the respective electrode plates 2a, 2b, 2c to drive the piezoelectric elements 1a, 1b,
the ultrasonic transducers are It can be vibrated in the sound wave range.
【0032】
The ultrasonic transducer according to the first embodiment is different from the conventional
ultrasonic transducer described above with reference to FIG. 5 in the circumferential direction of
the electrode plates 2a, 2b and 2c. The diameter of the annular shape excluding the terminal
portions 21a, 21b, and 21c partially protruding in the horizontal direction is smaller than the
diameter of the piezoelectric elements 1a and 1b. The diameter of the annular region 11 to which
the conductor on both sides of the piezoelectric elements 1a and 1b is applied also matches the
diameter of the annular shape excluding the terminal portions 21a, 21b and 21c of the electrode
plates 2a, 2b and 2c. Let
【0033】
Thus, the diameter (and the conductor application region 11) of the annular shape excluding the
terminal portions 21a, 21b and 21c of the electrode plates 2a, 2b and 2c is set smaller than the
diameter of the piezoelectric elements 1a and 1b. Thus, the shortest discharge creeping distance
between the adjacent electrode plates 2a, 2b, 2c is equal to the diameter of the annular shape of
the electrode plates 2a, 2b, 2c excluding the terminal portions 21a, 21b, 21c of the piezoelectric
elements 1a, 1b. This is larger than when the diameter is set to the same diameter. Therefore,
discharge between the electrode plates 2a, 2b and 2c is less likely to occur than in the prior art.
04-05-2019
6
【0034】
Further, in the first embodiment, the diameter of the annular shape excluding the terminal
portions 21a, 21b and 21c of the electrode plates 2a, 2b and 2c is smaller than the diameter of
the piezoelectric elements 1a and 1b. In the gaps between the piezoelectric elements 1a and 1b
and the gaps between the piezoelectric elements 1a and 1b and the insulating plates 3a and 3b,
as shown in d, e and f of FIG. . And thereby, the discharge between the electrode plates 2a, 2b
and 2c is made more difficult to occur.
【0035】
Next, a second point of the first embodiment different from the conventional ultrasonic
transducer described above with reference to FIG. 5 is the diameter of the piezoelectric element
side end 62a, 62b of each metal block 6a, 6b. Is set to be smaller than the diameter of the
insulating plates 3a and 3b. That is, for metal blocks 6a and 6b, for example, as shown in the
figure, cylindrical metal blocks 6a and 6b having the same diameter as the diameters of
piezoelectric elements 1a and 1b are chamfered in the vicinity of the piezoelectric element side
end. By squeezing, the diameters of the piezoelectric element side ends 62a and 62b of the metal
blocks 6a and 6b are smaller than the diameters of the pressure insulating plates 3a and 3b.
However, this is an example, and the diameter is reduced in a step shape coaxially near the
piezoelectric element side end of each of the cylindrical metal blocks 6a and 6b having the same
diameter as the diameter of the piezoelectric elements 1a and 1b. The diameters of the end
portions 62a and 62b may be smaller than the diameters of the insulating plates 3a and 3b.
【0036】
By doing this, the shortest discharge creeping distance between the electrode plates 2a and 2c
and the metal blocks 6a and 6b corresponds to the diameter of the piezoelectric element side end
portions 62a and 62b of the metal blocks 6a and 6b as the insulating plates 3a and 3b. It
becomes larger than the case of making the same diameter as the diameter of. Therefore, the
discharge between the electrode plates 2a and 2c and the metal blocks 6a and 6b is less likely to
occur than in the prior art.
【0037】
In the first embodiment, the metal blocks 6a and 6b are formed by setting the diameters of the
piezoelectric element side end portions 62a and 62b of the metal blocks 6a and 6b smaller than
the diameters of the insulating plates 3a and 3b. The gap between the insulating plates 3a and
3b may also be filled with the insulating adhesive 20 to further reduce the occurrence of
discharge between the electrode plates 2a and 2c and the metal blocks 6a and 6b.
04-05-2019
7
【0038】
The first embodiment of the present invention has been described above.
【0039】
Hereinafter, a second embodiment of the present invention will be described.
【0040】
FIG. 3 shows the structure of the ultrasonic transducer according to the present embodiment.
【0041】
In the figure, a is a top view of the ultrasonic transducer, b is a front view of the ultrasonic
transducer, and c is a schematic view showing the structure of the ultrasonic transducer by a
partial cross section.
【0042】
As illustrated, the ultrasonic transducer according to the second embodiment has the same basic
structure as the ultrasonic transducer according to the first embodiment, but the following points
are different.
【0043】
That is, in the second embodiment, the diameters of the ring-shaped members excluding the
terminal portions 21a, 21b and 21c of the electrode plates 2a, 2b and 2c are the same as the
diameters of the metal blocks 6a and 6b. The diameter of the piezoelectric elements 1a and 1b
and the diameter of the insulating plates 3a and 3b are increased.
【0044】
Even in this case, the shortest discharge creeping distance between the adjacent electrode plates
2a, 2b and 2c, and the shortest discharge creeping distance between the electrode plates 2a and
2c and the metal blocks 6a and 6b, the piezoelectric elements 1a and 1b and the electrode plates
When the diameters of the annular portions excluding the terminal portions 21a, 21b and 21c of
2a, 2b and 2c are the same or the diameters of the piezoelectric element side end portions 62a
and 62b of the metal blocks 6a and 6b are the diameters of the insulating plates 3a and 3b In the
same manner as in the first embodiment, the discharge between the adjacent electrode plates 2a,
04-05-2019
8
2b and 2c and the discharge between the electrode plates 2a and 2c and the metal blocks 6a and
6b are less likely to occur as in the first embodiment. can do.
【0045】
Also in the second embodiment, the insulating adhesive is filled in the gaps between the
piezoelectric elements 1a and 1b and the gaps between the piezoelectric elements 1a and 1b and
the insulating plates 3a and 3b, or the metal block 6a, An insulating adhesive may be applied to
the piezoelectric element side end portions 62a and 62b of 6b to make the discharge less likely
to occur.
【0046】
The second embodiment of the present invention has been described above.
【0047】
Hereinafter, a third embodiment of the present invention will be described.
【0048】
The third embodiment relates to an ultrasonic transducer of a type not using the insulating plates
3a and 3b used in the first and second embodiments.
【0049】
FIG. 4 shows the structure of the ultrasonic transducer according to the present embodiment.
【0050】
In the figure, a is a top view of the ultrasonic transducer, b is a front view of the ultrasonic
transducer, and c is a schematic view showing the structure of the ultrasonic transducer by a
partial cross section.
【0051】
As illustrated, the present ultrasonic transducer has a structure in which the insulating plates 3a
and 3b and the electrode plate 2c are just removed from the ultrasonic transducer according to
the first embodiment shown in FIG.
04-05-2019
9
【0052】
Then, in the third embodiment, the diameter of the annular shape excluding the terminal portions
21a and 21b partially projecting in the horizontal direction in the circumferential direction of the
electrode plates 2a and 2b and the piezoelectric elements of the metal blocks 6a and 6b The
diameters of the side end portions 62a and 62b are both set smaller than the diameters of the
piezoelectric elements 1a and 1b.
【0053】
By doing this, the shortest discharge creeping distance between the electrode plates 2a and 2b
adjacent to each other is equal to the diameter of the annular shape excluding the terminal
portions 21a and 21b of the electrode plates 2a and 2b and the diameter of the piezoelectric
elements 1a and 1b It becomes large compared with the case where it sets to the same diameter.
The shortest discharge creeping distance between the electrode plates 2a and 2b and the metal
blocks 6a and 6b is also set to the same diameter as the diameter of the piezoelectric elements 1a
and 1b of the piezoelectric element side end portions 62a and 62b of the metal blocks 6a and 6b.
It will be larger than it would be.
【0054】
Therefore, discharge between the electrode plates 2a and 2b and discharge between the
electrode plate 22b and the metal blocks 6a and 6b are less likely to occur than in the
conventional case.
【0055】
Also in the third embodiment, the insulating adhesive is applied to the gaps between the
piezoelectric elements 1a and 1b and the gaps between the piezoelectric elements 1a and 1b and
the piezoelectric element side end portions 62a and 62b of the metal blocks 6a and 6b. May be
filled to make discharge more difficult to occur.
【0056】
Further, in the third embodiment, as in the second embodiment, the diameter of the annular
shape excluding the terminal portions 21a and 21b of the electrode plates 2a and 2b and the
respective metal blocks 6a and 6b are made approximately the same. The diameters of the
piezoelectric elements 1a and 1b may be made larger than these diameters, and the same effect
can be obtained in this case as well.
【0057】
04-05-2019
10
The embodiments of the ultrasonic transducer according to the present invention have been
described above.
【0058】
In each of the above embodiments, the diameter of the annular shape excluding the terminal
portion of the electrode plate and the diameter of the piezoelectric element side end portions 62a
and 62b of the metal block are effective for preventing discharge while preventing a decrease in
output. In order to obtain an effect, it is preferable to make it within the range of 70 to 95
percent of the diameter of the piezoelectric element or the insulating plate.
【0059】
Further, although the case where the number of piezoelectric elements is two has been described
in the above embodiments, the number of piezoelectric elements may be arbitrary, and may be,
for example, three or more. And also in these cases, the present embodiment can be applied
similarly.
【0060】
As described above, according to the present invention, it is possible to provide an ultrasonic
transducer capable of more effectively preventing discharge between electrode plates.
【0062】
[0002] Brief description of the drawings
[0003] 1 is a diagram showing the structure of an ultrasonic transducer according to the first
embodiment of the present invention.
[0004] 2 is a diagram showing an assembly structure of the ultrasonic transducer according to
the first embodiment of the present invention.
[0005] 3 is a diagram showing the structure of an ultrasonic transducer according to a second
embodiment of the present invention.
04-05-2019
11
[0006] 4 is a diagram showing the structure of an ultrasonic transducer according to a third
embodiment of the present invention.
[0007] 5 is a diagram showing the structure of a conventional ultrasonic transducer.
[0008] Explanation of sign
[0009] 1a, 1b: Piezoelectric element, 2a, 2b, 2c: electrode plate, 3a, 3b: insulating plate, 4:
insulating tube, 5: bolt, 6a, 6b: metal block (front plate, backing plate), 20: adhesive
04-05-2019
12
Документ
Категория
Без категории
Просмотров
0
Размер файла
21 Кб
Теги
jp2003032795
1/--страниц
Пожаловаться на содержимое документа