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JP2003333695

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DESCRIPTION JP2003333695
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
Langevin-type vibrator in which a plurality of piezoelectric elements and electrodes are stacked,
and the stacked piezoelectric elements and the electrodes are bolted.
[0002]
2. Description of the Related Art In general, in a bolted Langevin type vibrator, a cylindrical
piezoelectric element and an electrode are laminated, and the laminated piezoelectric element
and the electrode are sandwiched between a backing plate and a horn to form a backing plate. It
is assembled by screwing in a bolt and tightening the laminated piezoelectric element and
electrode.
[0003]
However, in the case of a bolted Langevin type vibrator, when the laminated piezoelectric
element and the electrode are bolted, the backing plate is screwed into the bolt.
At this time, in order to rotate the backing plate, friction is generated between the backing plate
and the electrode, and the friction force causes the electrode to rotate with the backing plate.
When the electrode further rotates, friction occurs between the electrode and the piezoelectric
element, and the frictional force rotates the piezoelectric element with the electrode. When
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1
bolting in this way, the piezoelectric element and the electrode rotate in the radial direction to
cause positional deviation. As a result, the connecting terminal position of the electrode deviates
from the original position, and wiring to the connecting terminal of the electrode becomes
difficult Become.
[0004]
In addition, the friction caused by the rotation of the horn and the piezoelectric element and the
electrode in contact with the backing plate may cause damage to the contact surface or peel off
the contact surface, as well as the concentric arrangement of the components being disturbed. It
has been a cause of decreasing the durability.
[0005]
In order to solve the above problems, as described in JP-A 50-74392, the back plate is fixed with
a jig and tightened with a nut to rotate the piezoelectric element and the electrode. A method has
been proposed for assembling the vibrator while preventing it.
However, in this method, the backing plate is fixed by a jig and a special jig must be used to
prevent the rotation of the piezoelectric element and the electrode. For this reason, it is necessary
to prepare various dedicated tools. In addition, the tightening operation was also troublesome.
[0006]
As another solution, as in Japanese Utility Model Application Laid-Open No. 59-9697, a method
is also proposed in which the cross section of the bolt is a shape other than a perfect circle, and
the center hole of the piezoelectric element and the electrode is fitted into the cross section of
the bolt. It is done. However, in this method, the backing plate is rotated at the time of bolting,
and the piezoelectric element and the electrode receive a force in the direction of radial rotation
due to the frictional force between the piezoelectric element and the electrode. However, since
the piezoelectric element is made of ceramic, there is a possibility that stress may be
concentrated on a part and broken. In addition, since the electrode is generally made of a copper
alloy, there is a possibility that the electrode may be deformed due to the stress during rotation.
[0007]
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2
The present invention has been made focusing on the above-mentioned problems, and the object
of the present invention is a bolt which can prevent the turning of the piezoelectric element and
the electrode when the backing plate is bolted with a relatively simple structure. To provide a
tightening Langevin type vibrator.
[0008]
The invention according to claim 1 is a Langevin type vibration in which a plurality of
piezoelectric elements and electrodes are stacked, and the stacked piezoelectric elements and
electrodes are sandwiched between a tip member and a backing plate and tightened by bolts. In
the child, between the stacked piezoelectric element and the electrode, the bolt connected to the
tip member, the first backing plate screwed to the bolt, the first backing plate, and the electrode
A second backing plate disposed, and an engagement means for blocking relative rotation of the
second backing plate and the bolt.
The invention according to claim 2 is characterized in that the engaging means is provided with a
stopper on the second backing plate, a stopper provided on the bolt in the groove, and the
stopper fitted in the groove. It is a bolt-clamped Langevin type | mold vibrator of Claim 2.
[0009]
According to the invention of claim 1 and claim 2, when the first backing plate is bolted by fixing
the second backing plate disposed between the first backing plate and the electrode to the bolt ,
The piezoelectric element and the electrode do not rotate in the radial direction.
[0010]
The invention according to claim 3 is a Langevin type vibrator in which a plurality of
piezoelectric elements and electrodes are stacked, and the stacked piezoelectric elements and
electrodes are sandwiched between the tip member and the backing plate and tightened by bolts.
A bolt connected to the tip member, a first backing plate screwed to the bolt, and a second
backing plate disposed between the first backing plate and the electrode; The friction coefficient
between the surfaces of the first backing plate and the second backing plate in contact with each
other is smaller than that of the contact between the second backing plate and the other member.
[0011]
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3
According to the third aspect of the present invention, the coefficient of friction of the contact
surface between the first backing plate and the second backing plate is smaller than the
coefficient of friction between the second backing plate and the other member. When bolting the
first backing plate, the second backing plate does not rotate in the radial direction.
[0012]
The coefficient of friction of the contact surface of the first backing plate and the second backing
plate is the contact surface of the other members (for example, the second backing plate and
electrode, electrode and piezoelectric element, piezoelectric element and horn). It is desirable that
the coefficient of friction be smaller than the contact surface
[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A Langevin-type ultrasonic
transducer according to a first embodiment of the present invention will be described based on
FIGS. 1 and 2. FIG.
FIG. 1 is a longitudinal sectional view of the whole Langevin-type vibrator according to this
embodiment, and FIG. 2 is a perspective view showing a stopper provided on a second backing
plate and a groove portion provided on a bolt.
[0014]
As shown in FIG. 1, the bolt-clamped Langevin type vibrator 1 is formed by stacking the
piezoelectric element 2 and the electrode 3 formed in a cylindrical shape, respectively, and the
stacked piezoelectric element 2 and the electrode 3 are interposed between the backing plate 4
and the horn 5 It is assembled by pinching and tightening with a bolt 6.
The piezoelectric element 2 and the electrode 3 have an insertion hole 7 in the center of which a
bolt 6 is inserted.
The piezoelectric elements 2 are alternately stacked so that the same pole faces face each other
with the plate-like electrode 3 interposed therebetween.
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4
The bolt 6 penetrates the backing plate 4 and is further disposed over the piezoelectric element 2
and the electrode 3 so as to penetrate the inner hole (insertion hole) 7 thereof, and the tip
portion of the bolt 6 is a horn 5 as a tip member. Screwed tight.
[0015]
The backing plate 4 includes a first backing plate 4a located on the base end side and a second
backing plate 4b located on the electrode 3 side. The first backing plate 4a and the second
backing plate 4b are each formed in a cylindrical shape. A female screw 8 is formed in the inner
hole of the first backing plate 4a, and a male screw 10 formed at the rear end of the bolt 6 is
screwed into the female screw 8.
[0016]
A through hole 11 is formed in the second backing plate 4b so as to penetrate the backing plate
4b in the radial direction, and a pin-like stopper 12 is inserted into the hole 11 and fixed by
screwing. The stopper 12 is a so-called screw, and is screwed and fixed to a female screw formed
in the through hole 11 provided on the inner side surface of the second backing plate 4b.
[0017]
As shown in FIG. 2, the bolt 6 is formed with a long spline-like groove 13 along the axial
direction, and the protrusion-like stopper 12 is fitted into and engaged with the groove 13. For
this reason, the second backing plate 4 b is movable in the axial direction of the bolt 6, but is
engaged so as not to rotate around the bolt 6. By this, the engagement means for preventing
relative rotation between the second backing plate 4b and the bolt 6 is constructed.
[0018]
A square head 14 for attaching a tool such as a spanner is formed on the outer periphery of the
rear end of the second backing plate 4b, and a tool such as a spanner is placed on the head 14 to
rotate the second backing plate 4b. It can be operated.
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5
[0019]
The horn 5 is shaped like a conical diaphragm, and a female screw 16 to be screwed with the tip
screw 15 of the bolt 6 is formed at the central part of the surface in contact with the
piezoelectric element 2.
An ultrasonic wave transmission member 17 is connected to the horn 5.
[0020]
The bolted Langevin type transducer 1 is usually covered by a hand case not shown, and the
ultrasonic wave transmission member 17 is covered by a sheath attached to the hand case.
[0021]
Next, a method of assembling the bolted Langevin type vibrator 1 will be described.
First, the distal end screw portion 15 of the bolt 6 is screwed into the female screw portion 16 of
the horn 5, and the bolt 6 is erected on the horn 5. The erected bolts 6 are inserted into the
insertion holes 7 of the piezoelectric element 2 and the electrode 3 so that the piezoelectric
elements 2 and the electrodes 3 are alternately stacked sequentially from the horn 5 side.
Thereafter, the second backing plate 4b is inserted into the bolt 6, and the second backing plate
4b is superimposed on the electrode 3 located at the rearmost end.
[0022]
Then, insert the stopper 12 into the through hole 11 provided in the second backing plate 4 b,
and project the tip of the stopper 12 inward of the second backing plate 4 b until it abuts on the
groove 13 of the bolt 6. Screw it in deeply.
[0023]
Finally, the first backing plate 4a is fitted into the bolt 6, and the second backing plate 4b is
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screwed with a tool such as a spanner, and the piezoelectric element 2, the electrode 3 and the
second backing plate 4b are placed on the second backing plate 4b. Tighten.
As a result, the bolted Langevin type vibrator 1 is completed. Wiring such as connection of lead
wires to each electrode 3 or connection of the ultrasonic wave transmission member 17 to the
horn 5 is usually performed after completion of the bolted Langevin type vibrator 1.
[0024]
As described above, in the present embodiment, the stopper 12 is provided on the second
backing plate 4b, and the stopper 12 is engaged with and engaged with the groove 13 of the bolt
6. For this reason, the second backing plate 4 b is fixed to the bolt 6. Therefore, when the first
backing plate 4a is turned and bolted with a tool such as a spanner or the like, the second
backing plate 4b does not rotate, and therefore, the piezoelectric element 2 and the electrode 3
are caught by the second backing plate 4b. Does not rotate in the radial direction.
[0025]
In addition, no special jig is required to prevent the rotation of parts when bolting, and no
rotational stress is applied to the piezoelectric element 2 and the electrode 3, so the piezoelectric
element 2 and the electrode 3 are deformed. There is no damage such as
[0026]
Second Embodiment A Langevin-type ultrasonic transducer according to a second embodiment of
the present invention will be described with reference to FIG.
FIG. 3 is a partially exploded longitudinal sectional view of the Langevin-type vibrator according
to the present embodiment.
[0027]
The Langevin-type vibrator 1 according to this embodiment has the same basic form as that of
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the first embodiment described above. Therefore, the same reference numerals are given to the
same parts and the detailed description thereof is omitted.
[0028]
Both the first backing plate 4a and the second backing plate 4b are made of stainless steel. The
material of the horn 5 is also stainless. The first backing plate 4a and the second backing plate
4b have flat contact surfaces which are joined together when assembled. Further, the contact
surface of the backing plates 4a and 4b is formed as a plane perpendicular to the axis of the bolt
6. The contact surface of the first backing plate 4a in contact with the second backing plate 4b is,
for example, coated with Teflon (registered trademark), and the lubricating layer 21 is formed on
the contact surface of the first backing plate 4a. . Further, on the contact surface of the second
backing plate 4b that contacts the first backing plate 4a, for example, a Teflon coating is applied
to form a lubricating layer 22. The lubricating layers 21 and 22 of the first backing plate 4a and
the second backing plate 4b are joined to each other.
[0029]
The piezoelectric element 2 is made of a ceramic having an electrostrictive effect, and silver
electrodes are formed on both end faces of the piezoelectric element 2. The material of the
electrode 3 is a copper alloy. Moreover, the friction coefficient of each part which mutually joins
is as follows.
[0030]
The coefficient of friction of the contact surface between the horn 5 and the piezoelectric
element 2 is 0.32, the coefficient of friction between the contact surface between the
piezoelectric element 2 and the electrode 3 is 0.8, and the coefficient of friction between the
contact surface between the electrode 3 and the second backing plate 4b is The friction
coefficient of the contact surface between the 0.46 first backing plate 4a and the second backing
plate 4b is 0.1 or less.
[0031]
Next, a method of assembling the bolted Langevin type vibrator 1 will be described.
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First, the distal end screw portion 15 of the bolt 6 is screwed into the female screw portion 16 of
the horn 5, and the bolt 6 is erected on the horn 5. The erected bolts 6 are inserted into the
insertion holes 7 of the piezoelectric element 2 and the electrode 3 so that the piezoelectric
elements 2 and the electrodes 3 are alternately stacked sequentially from the horn 5 side.
Thereafter, the second backing plate 4b is fitted into the bolt 6, and the second backing plate 4b
is superimposed on the electrode 3 at the rearmost end. At this time, the second backing plate 4b
is fitted with the surface of the Teflon-coated lubricating layer 22 facing up. Furthermore, the
first backing plate 4a is fitted over the second backing plate 4b. At this time, the first backing
plate 4a is superimposed on the second backing plate 4b with the surface of the lubricant layer
21 coated with Teflon facing downward (toward), and screwed into the bolt 6 with a tool such as
a spanner. The second backing plate 4b is tightened to the first backing plate 4a.
[0032]
Although the stopper 12 and the groove 13 for engaging and engaging the stopper 12 are not
provided in the present embodiment, the lubricating layer 21 of the first backing plate 4a and the
lubricating layer 22 of the second backing plate 4b slip easily, and the first backing plate When
the plate 4a is screwed into the bolt 6, the rotation of the first backing plate 4a is not transmitted
to the second backing plate 4b. That is, the second backing plate 4b does not rotate, and the
piezoelectric element 2 and the electrode 3 do not rotate in the radial direction. Therefore, the
same effect as that of the first embodiment can be obtained.
[0033]
The second embodiment can be modified to set the coefficient of friction of the contact surface
between the first backing plate 4a and the second backing plate 4b to 0.1 or less as follows. 1.
A lubricating oil such as silicone oil is applied to the contact surface between the first backing
plate 4a and the second backing plate 4b. 2. The contact surface is made smooth by
electrolytic polishing. 3. The material of the first backing plate 4a is alumina.
[0034]
The Langevin-type vibrator according to the present invention can be applied to treatment
instruments for treatment, industrial instruments and the like.
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[0035]
As described above, according to the present invention, it is possible to prevent the turning of the
piezoelectric element and the electrodes when bolting the backing plate with a relatively simple
structure.
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