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JP2012039304

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2012039304
An object of the present invention is to improve the reliability of replacement of a chip attached
to and detached from an ultrasonic transducer, and to ensure ease of manual gripping and
operation of a handpiece using an ultrasonic transducer. An ultrasonic transducer having an
outer fastening structure including a piezoelectric element unit in which a piezoelectric element
and an electrode plate are stacked, and a front member 30 and a backing member sandwiching
the piezoelectric element unit. The support member 33 is provided on the front surface member
30 so as to extend radially outward centering on the axis L of the front surface member 30, and
support the ultrasonic vibrator in a vibratable manner. An end face 33A extending in a direction
intersecting the circumferential direction about the axis L is formed, and the area of the radially
outer portion of the end face 33A is characterized by being larger than the area of the inner side.
[Selected figure] Figure 3
Ultrasonic transducer
[0001]
The present invention is an ultrasonic transducer that generates ultrasonic vibration by electrical
distortion of a piezoelectric element, and is used for dental removal such as removal of dental
calculus and oral surgery, medical equipment such as ultrasonic scalpel, and processing
machines such as cutters and files. And an ultrasonic transducer suitable for use in the present
invention.
[0002]
04-05-2019
1
Conventionally, a piezoelectric element unit in which a plurality of piezoelectric elements and
electrode terminal plates are alternately stacked is referred to as a front member (a horn or an
amplitude amplification horn) made of a metal block.
A Langevin-type ultrasonic transducer (hereinafter, simply referred to as an "ultrasonic
transducer") having a structure disposed between the above and the backing member. )It has
been known. The ultrasonic transducer is housed inside a cylindrical case, and a space is kept
between the inner circumferential surface of the case and the ultrasonic transducer by, for
example, a flange portion extending in a plate shape from the front surface member to the inner
surface of the case. The ultrasonic transducer is vibratably supported.
[0003]
When ultrasonic transducers are used in dental removal such as dental calculus and oral surgery,
medical devices such as ultrasonic scalpels, and processing machines such as cutters and files,
they are suitable for each application at the tip of ultrasonic transducers. A tip such as a scalpel
is attached. Screws are mainly used to attach a chip to an ultrasonic transducer. For example, an
external thread formed along the center line of the truncated cone is formed at one end of the tip
of the ultrasonic transducer (front member) formed in a truncated cone shape and the tip, and an
internal thread combined with the external thread at the other The tip is attached to the
ultrasonic transducer (front member) by forming a portion and screwing (tightening) the male
screw portion into the female screw portion.
[0004]
Generally, the chip is replaced with one having a shape suitable for the work content to be used,
and therefore, the chip is often attached to and detached from the ultrasonic transducer (front
member) disposed in the case. For example, if the inner surface of the case is formed in a
cylindrical shape and the flange is formed in a disk shape, the ultrasonic transducer rotates
around the above-mentioned center line with respect to the case. That is, it becomes difficult to
tighten the male screw portion into the female screw portion, and it becomes difficult to loosen it.
As a result, it becomes difficult to attach and detach the tip to the ultrasonic transducer (front
member).
[0005]
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2
Then, the technique which prevents rotation of the ultrasonic transducer with respect to a case is
known by changing the inner surface shape of a case, and the external shape of a flange. For
example, as shown in FIG. 12, a part of the outer periphery of the disk-shaped flange 334 is cut
in a straight line to form a D-shape or an H-shape (D cut or H cut), and a cylindrical case 350 is
formed. There is known a method of preventing rotation of the ultrasonic transducer (front
member) 330 by forming the flat surface 354A corresponding to the notch 333A of the flange
334 on the inner surface of the flange 334 and combining the notch 333A and the flat surface
354A. ing. Further, as shown in FIG. 13, a notch 433A is formed on a part of the outer periphery
of the disk-like flange 434, and a protrusion 454A corresponding to the notch 433A of the flange
434 is formed on the inner surface of the cylindrical case 450. There is known a method of
preventing rotation of the ultrasonic transducer (front member) 430 by fitting the notched
groove 433A and the projection 454A. Alternatively, a method is also known in which the
rotation of the ultrasonic transducer is prevented by forming the flange in a rectangular plate
shape, forming the inner surface of the case in a rectangular cylindrical shape, and combining
the outer shape of the flange and the inner surface of the case. .
[0006]
In addition, a plate-like flange extending in the radial direction is disposed discretely in the
circumferential direction with respect to the cylindrical front member, and the inner surface of
the case is formed in accordance with the shape of the discretely disposed flange. There is also
proposed a method for preventing the rotation of the ultrasonic transducer by combining the two
(for example, see Patent Document 1).
[0007]
JP 2009-511206 gazette
[0008]
On the other hand, medical devices such as ultrasonic scalpels using the above-mentioned
ultrasonic transducers, and processing machines such as cutters and files are used in the state of
being held by the hands of a doctor, a dentist or a worker In other words, it is used as a
handpiece.
Therefore, the shape and weight of the ultrasonic transducer are required to be contained in a
04-05-2019
3
range that can be easily used as a handpiece.
[0009]
For example, the portion of the case directly gripped by hand needs to be formed in the range of
the outer diameter (thin diameter) that can be easily gripped by hand. It should be formed within
the desired outer diameter range.
In addition, as a whole of a medical device or the like used as a handpiece, it is necessary to be
formed with a weight that is not easily fatigued even when it is held by hand, so that ultrasonic
transducers that constitute the medical device etc. It should be formed within the desired weight
range.
[0010]
Then, there has been a problem that it is difficult to achieve both of preventing relative rotation
between the case and the ultrasonic transducer, and forming the ultrasonic transducer with a
shape and weight within a desired range. For example, as shown in FIGS. 12 and 13, the method
of forming a D-shaped or H-shaped plate by cutting out a plate-like flange, the method of forming
a square shape, or the method of forming a cut groove If priority is given to preventing rotation,
the outer diameter of the case becomes large and it becomes difficult to grip with the hand, and
conversely, if the outer diameter of the case falls within the range that can be easily grasped by
hand, it is difficult to prevent relative rotation. there were.
[0011]
The method shown in FIGS. 12 and 13 forms contact surfaces extending in the direction
intersecting with the direction of the relative rotation described above in both the case and the
flange, and allowing relative rotation by bringing the contact surfaces into contact with each
other. It is preventing. The contact surface is formed so as to have an area such that the case and
the flange do not deform or break even with the magnitude of the force applied when attaching
and detaching the chip. Then, the outer diameter of the flange and the outer diameter of the case
were increased by the provision of the contact surface.
04-05-2019
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[0012]
On the other hand, if the case is formed in the range of the outside diameter which is easy to be
gripped by hand, the area of the above-mentioned contact surface becomes small, and the case
and the flange are deformed Or there was a risk of damage.
[0013]
When the area of the contact surface is reduced, it is conceivable to form the case with a metal or
the like having higher strength than a resin or the like as a method for preventing the
deformation or breakage of the case.
However, since the specific gravity of metals and the like is heavier than that of resin, the weight
of the case is heavier, and the weight of the ultrasonic element and the medical device is also
heavier. .
[0014]
Even with the method of disposing the plate-like flanges discretely in the circumferential
direction described in Patent Document 1, there is a problem that it is difficult to simultaneously
secure the area of the contact surface and reduce the diameter of the case. there were. In the
case of Patent Document 1, the circumferentially facing end surface of the plate-like flange
extending in the radial direction is the above-described contact surface. In this case, in order to
increase the area of the contact surface, it is conceivable to extend the plate-like flange in the
radial direction or to increase the plate thickness of the flange.
[0015]
In the method of extending the flange in the radial direction, as in the case described above, the
outer diameter of the case increases, so it is difficult to achieve compatibility with the reduction
of the case diameter. Further, in the method of increasing the plate thickness of the flange, since
the outer diameter of the case does not increase, it is possible to make the case smaller in
diameter. However, by increasing the plate thickness of the flange, the weight of the flange
increases, and the weight of the ultrasonic transducer, the medical device, and the like increases.
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[0016]
The present invention has been made to solve the above-described problems, and improves the
certainty of replacement of a chip attached to and detached from an ultrasonic transducer, and
by hand in a vibrating device using the ultrasonic transducer. It is an object of the present
invention to provide an ultrasonic transducer that can ensure ease of gripping and ease of
operation.
[0017]
In order to achieve the above object, the present invention provides the following means.
An ultrasonic transducer according to a first aspect of the present invention is an ultrasonic
transducer having an outer fastening structure including a front member sandwiching a
piezoelectric element and an electrode plate, and a backing member, and A support extending
radially outward about the axis of the front member and vibratably supporting the front member,
the piezoelectric element, the electrode plate, and the backing member is provided, and the
support includes the axis. An end face extending in a direction intersecting the circumferential
direction centering on the center is formed, and the area of the radially outer portion in the end
face is larger than the area of the inner side. The cross-sectional shape of the piezoelectric
element is preferably a circle, a regular polygon, a point-symmetrical shape, or the like.
[0018]
According to the ultrasonic transducer according to the first aspect of the present invention, it is
possible to make surface contact with the end surface formed on the support portion and a part
of the inner surface of the housing accommodating the ultrasonic transducer, for example, the
above-mentioned end surface By bringing the side surfaces of the projecting portion formed into
the shape into contact with each other, it is possible to prevent the housing and the ultrasonic
transducer from rotating relative to each other about the axis when attaching and detaching the
chip. On the other hand, when the shape of the end face is divided into the radially outer side and
the inner side and compared, the area of the outer side portion is formed to be larger than the
area of the inner side, thereby securing the area of the end face The weight increase can be
suppressed.
04-05-2019
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[0019]
In general, when a force is applied in a direction in which the housing and the ultrasonic
transducer relatively rotate around the axis, a large force acts on the radially outer portion of the
end surface as compared with the radially inner portion. Therefore, when the radially outer
portion and the radially inner portion are formed to have equal areas, the surface pressure or
stress acting on the radially outer portion is greater than the surface pressure or stress of the
radially inner portion. Will also be high.
[0020]
As in the ultrasonic transducer according to the first aspect of the present invention, when the
radially outer portion is formed to have a wider area as compared with the radially inner portion,
the radially outer side is compared to the above case. The surface pressure and stress of the part
of
[0021]
Furthermore, as compared with the method of increasing the plate thickness of the entire
support portion to increase the area of the end face, the area of the radial inner portion of the
end face is reduced, so the volume of the support portion is reduced and the weight is increased.
Can be prevented or the weight can be reduced.
As a result, it is possible to prevent an increase in the weight of the ultrasonic transducer or to
reduce its weight. More preferably, in all the radial cross sections of the support portion, it is
desirable to make the area of the radially inner portion smaller than the area of the radially outer
portion as in the end face. By doing this, the weight increase of the support portion can be more
reliably prevented or the weight reduction can be achieved more effectively.
[0022]
Here, that the area of the radially outer portion at the end face is larger than the area of the inner
portion means that, for example, in the axial length at the end face, the radially outer portion is
longer than the inner portion. Alternatively, the pair of sides disposed in line in the axial direction
and opposed to each other in the end face may be sides which are continuously or discretely
separated from each other as the radial outer side is approached.
04-05-2019
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[0023]
In the invention according to the first aspect, the support portion is formed in the axial direction
and the circumferential direction from a plate-like flange portion extending in the radial direction
and the circumferential direction, and the radially outer end of the flange portion. And an
extending plate-like outer end.
[0024]
Thus, by extending the ring plate-like flange portion radially outward from the outer surface of
the support portion and extending the cylindrical outer end portion in the axial direction from
the outer end of the flange portion, the end face of the support portion Among them, the area of
the radially outer portion can be made larger than the area of the radially inner portion.
For example, when the outer end is extended in one direction from the outer end of the flange,
the end face is formed in an L shape, and when the outer end is extended in both directions, the
end face is formed in a T shape.
Here, the outer end of the flange may be covered by the outer end, and the radially outer end
face of the support may be formed only from the surface of the outer end, or the outer end of the
flange and the outer end The radial outer end face of the support may be formed from the
surface of the support.
[0025]
Furthermore, compared with the case where the support portion is formed in a plate shape, the
contact area between the support portion and the inner surface of the housing can be increased
while suppressing the weight increase of the support portion. The outer end portion is a
cylindrically curved plate member extending in the axial direction and the circumferential
direction, and is in contact with the inner surface of the housing on the outer peripheral surface
thereof. Therefore, the contact area between the support portion and the inner surface of the
housing can be easily adjusted by adjusting the axial length of the outer end portion.
Furthermore, even if the axial length of the outer end portion is increased, the increase in weight
of the support portion is suppressed, for example, as compared to the case where the overall
04-05-2019
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plate thickness of the support portion is increased.
[0026]
An ultrasonic transducer according to a second aspect of the present invention is an ultrasonic
transducer having an outer fastening structure including a front member sandwiching a
piezoelectric element and an electrode plate, and a backing member, and the front member
comprises the above-mentioned front member A support extending radially outward about the
axis of the front member and vibratably supporting the front member, the piezoelectric element,
the electrode plate, and the backing member is provided, and the axis of the support is centered
At both ends in the circumferential direction, an end face extending in a direction crossing the
circumferential direction and in contact with a part of the inner surface of the housing is formed,
and the area at the end face is between the ends of the support portion Is larger than a crosssectional area in a plane cut by a plane including the axis.
[0027]
According to the ultrasonic element according to the second aspect of the present invention, it is
possible to make surface contact with the end face formed on the support portion and a part of
the inner surface of the housing accommodating the ultrasonic transducer, for example, the
above end face The housing and the ultrasonic transducer can be prevented from rotating
relative to each other about the axis by bringing the side surfaces of the projecting portion
formed into the shape into contact with each other.
[0028]
On the other hand, it is possible to widen the area of the end while suppressing an increase in
weight of the support or reducing the weight.
That is, the area of the end surface is the area of the surface (cross section) obtained by cutting
the support in the radial direction, ie, the surface obtained by cutting a portion other than the
end face of the support at a plane including the axis. On the other hand, by making the area of
the end face as it is or larger, it is possible to suppress an increase in weight of the support
portion or to reduce the weight and to widen the area of the end portion.
[0029]
In the invention according to the second aspect, the support portion is a plate-like flange portion
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extending along the circumferential direction and the radial direction, and the axial direction and
the radial direction from an end of the circumferential direction of the flange portion It is
desirable to have the plate-like side end extended along with.
[0030]
In this manner, the ring plate-shaped flange portion extends radially outward from the outer
surface of the support portion, and the plate-shaped side end portion is extended in the axial
direction from the circumferential side end of the flange portion. The area can be larger than the
cross-sectional area of the plane cut by the plane including the axis between the end faces of the
support portion.
The side end may be arranged, for example, to extend in one direction only from the side end of
the flange portion or may be arranged to extend in both directions.
[0031]
In the invention according to the first or second aspect, it is preferable that the support portions
be arranged at equal intervals in a circumferential direction around the axis.
This makes it easy to ensure the strength of the housing that accommodates the ultrasonic
transducer inside. That is, in the portion where the support portion is not disposed, the inner
surface of the housing can be protruded to the vicinity of the front surface member. In other
words, the inner surface of the housing can be protruded to the area where the support portion
is disposed, and the thickness from the outer surface to the inner surface of the housing can be
increased. On the other hand, the portion where the support portion is disposed can have the
same thickness as in the case where the conventional disk-shaped support portion is used. As a
result, the average thickness of the housing in the circumferential direction can be increased
without increasing the outer diameter of the housing, which makes it easy to secure the strength
of the housing.
[0032]
In the invention according to the first or second aspect, the support portion is disposed at a
position of a node of vibration in a structure including the front surface member, the
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10
piezoelectric element, the electrode plate, and the backing member. Is desirable.
[0033]
By this, even if the ultrasonic transducer is housed inside the housing, it becomes difficult to
inhibit the vibration of the ultrasonic transducer.
When the ultrasonic transducer is housed inside the housing, the ultrasonic transducer is
supported in a state of being spaced from the inner surface of the housing. In this state, when the
piezoelectric element and the electrode plate are vibrated, for example, longitudinally vibrated at
the natural frequency of the ultrasonic transducer or at a frequency close to the natural
frequency, the end of the front member of the ultrasonic transducer and the backing member A
standing wave is generated with the end of the finger at the belly. In this case, when the support
portion is disposed at the position of the node in the stationary wave, the influence of the
support portion on the longitudinal vibration of the ultrasonic transducer, for example,
suppression of the longitudinal vibration can be suppressed.
[0034]
According to the ultrasonic transducer in accordance with the first aspect of the present
invention, the end face is formed on the supporting portion that vibratably supports the
ultrasonic transducer, and the area of the radially outer portion of the end face is larger than the
area of the inner portion In addition, the reliability of the replacement of the tip attached to and
removed from the ultrasonic transducer is improved by widening, and the handgrip of the
handpiece in which the ultrasonic transducer is used is easy to carry out and the operation is
easy. The effect of improving the size is exhibited.
[0035]
According to the ultrasonic transducer in accordance with the second aspect of the present
invention, the end face is formed on the support portion that vibratably supports the ultrasonic
transducer, and the area of the end face is between the end face and the end face of the support
portion By making it wider than the cross-sectional area of the plane cut by the plane including
the axis in the case, it is possible to improve the certainty of exchange in the chip attached to and
detached from the ultrasonic transducer, and by the hand in the handpiece using the ultrasonic
transducer. This has the effect of being able to improve the ease of holding and the ease of
working.
04-05-2019
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[0036]
It is a see-through | perspective perspective view explaining the whole structure of the ultrasonic
vibration apparatus which concerns on one Embodiment of this invention.
FIG. 2 is an exploded perspective view for explaining the entire configuration of the ultrasonic
transducer of FIG.
FIG. 3 is a partial enlarged perspective view illustrating the configuration of the front surface
member of FIG. 2; It is a partial enlarged plan view explaining the structure of a front member. It
is a front view explaining the structure of a front member. It is a fragmentary perspective view
explaining the structure of the case main body of FIG. It is a plane view explaining the state
where the ultrasonic transducer was inserted in the case main part. It is a cross-sectional view
explaining the state in which the support part was inserted in the groove part of FIG. It is a top
view explaining another embodiment of the front member of FIG. It is a front view explaining the
structure of the support part of FIG. It is a front view explaining another embodiment of the front
member of FIG. It is a top view explaining the structure which prevents relative rotation with the
conventional front member and case. It is a top view explaining the other structure which
prevents relative rotation with the conventional front member and case.
[0037]
Hereinafter, an ultrasonic vibration apparatus 1 including an ultrasonic transducer 10 according
to an embodiment of the present invention will be described with reference to FIGS. 1 to 11. FIG.
1 is a transparent perspective view for explaining the overall configuration of the ultrasonic
vibration apparatus 1 according to the present embodiment, and FIG. 2 is an exploded
perspective view for explaining the overall configuration of the ultrasonic transducer 10 of FIG.
[0038]
The ultrasonic vibration device 1 according to the present embodiment is a medical device such
as an ultrasonic scalpel or an ultrasonic dental plaque remover which performs work by holding
it in a hand, a processing machine such as an ultrasonic cutter or an ultrasonic file, in other
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12
words a handpiece , It is used as a handy type device. As shown in FIG. 1, the ultrasonic vibration
device 1 includes an ultrasonic transducer 10 for generating ultrasonic vibration, and a case 50
for accommodating the ultrasonic transducer 10 inside and for the operator to hold. Mainly
provided.
[0039]
As shown in FIGS. 1 and 2, the ultrasonic transducer 10 includes a piezoelectric element unit 20
that generates ultrasonic vibration, and a front member 30 and a backing member 40 that hold
the piezoelectric element unit 20 therebetween. Is mainly provided.
[0040]
The piezoelectric element unit 20 is a vibrator unit in which the piezoelectric elements 21 and
the electrode plates 22 are alternately stacked, and is configured as a so-called Langevin-type
vibrator.
The piezoelectric element unit 20 is mainly configured of a cylindrical piezoelectric element 21
having a through hole at its center and an electrode plate 22 formed in a ring plate shape.
[0041]
The present embodiment will be described by applying to an example of the piezoelectric
element unit 20 in which four piezoelectric elements 21 and four electrode plates 22 are
provided. The four electrode plates 22 are disposed at three locations between the piezoelectric
elements 21 and at one location between the piezoelectric elements 21 and the backing member
40, respectively.
[0042]
The piezoelectric element 21 is formed by pressing and forming lead zirconate titanate (PZT) as a
material, and is fired, and is applied with a conductive paste on both end faces and polarized in
the oil by polarization in oil. Thereafter, the piezoelectric element 21 is ground and polished into
a predetermined shape, and silver (Ag) is vapor-deposited on the upper and lower end faces
04-05-2019
13
adjacent to the electrode plate 22 and the backing member 40 to form a conductive layer.
Further, a through hole formed at the center of the piezoelectric element 21 is a hole through
which a tightening bolt 23 used when clamping and holding the piezoelectric element unit 20
between the front surface member 30 and the backing member 40 is inserted.
[0043]
The electrode plate 22 is a ring plate-like member formed of a conductive material such as
beryllium copper and supplies power to the piezoelectric element 21. The electrode plate 22 is
formed with a through hole through which the tightening bolt 23 is inserted at the center, and a
disc portion formed to have the same diameter as the piezoelectric element 21, and protrudes
radially outward from the disc portion. And a terminal portion to be electrically connected. The
terminal portion of the electrode plate 22 is formed in the minimum necessary size so as not to
be in contact with the case 50 or to inhibit the vibration of the ultrasonic transducer 10.
[0044]
The terminal portion of the electrode plate 22 electrically connected to the positive electrode of
the power supply for supplying power to the piezoelectric element unit 20 and the terminal
portion of the electrode plate 22 electrically connected to the negative electrode are prevented
from shorting each other In order to project in different directions. In this embodiment, the
terminal portion of the electrode plate 22 connected to the positive electrode protrudes upward
in FIG. 2, and the terminal portion of the electrode plate 22 connected to the negative electrode
is applied to an example protruding downward in FIG. Explain.
[0045]
FIG. 3 is a partial enlarged perspective view for explaining the configuration of the front surface
member 30 of FIG. FIG. 4 is a partial enlarged plan view illustrating the configuration of the front
member 30, and FIG. 5 is a front view illustrating the configuration of the front member 30. As
shown in FIG.
[0046]
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The front surface member 30 is, as shown in FIGS. 3 to 5, a large diameter cylindrical portion 31
provided with an abutting surface 31A which is an end surface to which the piezoelectric element
unit 20 abuts, and an end surface which emits ultrasonic vibration. An oscillating radiation
surface 32A (see FIG. 2). And the small-diameter cylindrical portion 32 provided with
Furthermore, it is formed as a metal block having a truncated cone-like portion whose diameter
decreases continuously from the large diameter cylindrical portion 31 toward the small diameter
cylindrical portion 32.
[0047]
The front member 30 has a length from the contact surface 31A to the vibration radiation
surface 32A, that is, an axial length, formed to a length of λ / 4, for example, assuming that the
wavelength at the resonant frequency of the piezoelectric element unit 20 is λ. It is done.
Therefore, the front surface member 30 functions as a horn for transmitting the ultrasonic
vibration generated in the piezoelectric element unit 20 to the vibration emission surface 32A.
[0048]
Further, the large diameter cylindrical portion 31 of the front surface member 30 is provided
with a support portion 33 for vibratably supporting the ultrasonic transducer 10 inside the case
50. The support portion 33 is a member projecting radially outward from the circumferential
surface of the large diameter cylindrical portion 31 with the central axis L of the front surface
member 30 as a center, and discretely spaced at intervals of about 120 ° in the circumferential
direction It is arranged. Therefore, a pair of end surfaces 33A and 33A is provided at the end of
the support portion 33 in the circumferential direction. The front surface member 30 and the
support portion 33 are members made of titanium (Ti), aluminum (Al), stainless steel (SUS) or the
like, and in the present embodiment, the support portion 33 is integrally formed with the front
surface member 30.
[0049]
In the support portion 33, a flange portion 34 extending in a radial and circumferential direction
from the large diameter cylindrical portion 31 and a cylinder extending in a direction along the
central axis L from the radial outer end of the flange portion 34 and in the circumferential
04-05-2019
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direction A plate-like outer end portion 35 which constitutes a part of the surface is provided.
The flange portion 34 is a position at which a node of the amplitude when the ultrasonic
transducer 10 vibrates, in other words, a position of λ / 4 from the vibration radiation surface
32A which is the tip of the ultrasonic transducer 10, and ultrasonic vibration It is provided at a
position (n = 0, 1, 2, 3,...) Of λ / 4 + n × λ / 2 from the end of the tightening bolt 23 which is
the rear end of the element 10. Therefore, vibration inhibition of the ultrasonic transducer 10 by
the support portion 33 can be suppressed. Furthermore, the support portion 33 is formed such
that a predetermined gap is secured between the support portion 33 and a case main body 51
described later when the ultrasonic transducer 10 is housed in the case 50. Also by this, the
vibration inhibition of the ultrasonic transducer 10 by the support portion 33 is suppressed.
However, the predetermined interval between the holding portion 33 and the case main body 51
may not be secured, and is not particularly limited. For example, when the ultrasonic transducer
10 is pressed into the case 50, the above-mentioned interval is not secured.
[0050]
On the other hand, the outer end portion 35 covers the radially outer end of the flange portion
34, and only the outer peripheral surface of the outer end portion 35 is arranged to constitute
the outer peripheral surface of the support portion 33. The outer end portion 35 is disposed on
the surface on the side of the contact surface 31A of the flange portion 34, and the radially outer
end surface of the flange portion 34 and the outer peripheral surface of the outer end portion 35
constitute the outer peripheral surface of the support portion 33. It may be arranged in
[0051]
In the present embodiment, an example in which the outer end 35 extends from the end of the
flange 34 toward the side of the piezoelectric element unit 20 (upper side in FIG. 3), in other
words, when the cross section of the support 33 is L-shaped Apply and explain. The direction in
which the outer end portion 35 extends may be on the side of the piezoelectric element unit 20
as described above, or may be on the side of the small-diameter cylindrical portion 32, or may be
on the opposite side. In other words, the support portion 33 may be formed in a T-shaped cross
section, and is not particularly limited.
[0052]
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In the present embodiment, the diameter of the support portion 33 (outer end 35) is 12.0 mm
and the width of the support portion 33 in the circumferential direction is 3.0 mm with respect
to the piezoelectric element 21 having a diameter of 8.0 mm. The thickness of the flange portion
34 (the thickness in the central axis L direction) is 1.0 mm, and the length of the outer end 35
(the length in the central axis L direction) is 2.0 mm. Furthermore, the radial length of the outer
end portion 35 (width from the outer peripheral surface of the outer end portion 35 to the inner
peripheral surface) is 1.0 mm, and the radial length (large) of the flange portion 34 The length
from the circumferential surface of the diameter cylindrical portion 31 to the inner
circumferential surface of the outer end portion 35 is 1.0 mm.
[0053]
The backing member 40 is formed as a columnar metal block provided with an abutting surface
which abuts the piezoelectric element unit 20 at one end. Further, at the center of the backing
member 40, a female screw portion with which the male screw portion of the tightening bolt 23
is engaged is provided.
[0054]
The case 50 is a portion that accommodates the ultrasonic transducer 10 so as to be able to
vibrate and is held by the operator when holding the ultrasonic vibration device 1. In the case 50,
as shown in FIG. 1, a cylindrical case body (housing) 51, and a case tip 52 formed in a truncated
cone shape detachably attached to the end of the case body 51, and , Is mainly provided.
[0055]
6 is a partial perspective view for explaining the configuration of the case main body 51 of FIG.
FIG. 7 is a plan view for explaining a state in which the ultrasonic transducer 10 is inserted into
the case main body 51. FIG. 8 is a sectional view for explaining a state in which the support
portion 33 is inserted into the groove 54 in FIG. FIG.
[0056]
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As shown in FIGS. 1 and 6, the case body 51 is formed of a lightweight and strong material such
as resin, and has a cylindrical space 53 for housing the ultrasonic transducer 10 therein.
Between the space 53 and the ultrasonic transducer 10, a gap for allowing the vibration of the
ultrasonic transducer 10 is provided. Furthermore, on the inner surface of the case main body 51
and at a position corresponding to the support portion 33 of the ultrasonic transducer 10, a
groove portion 54 into which the support portion 33 is inserted is provided. That is, the groove
portion 54 is formed on the inner surface of the case main body 51 at intervals of about 120 °
in the circumferential direction, and the inner surface of the groove portion 54 is formed similar
to the support portion 33 in plan view . Contact surfaces 54A and 54A, which are in surface
contact with the case body 51 and the ultrasonic transducer 10 when the case body 51 and the
ultrasonic transducer 10 rotate relative to each other, are located in the groove 54 at the
portions facing the end faces 33A and 33A of the support portion 33 It is provided.
[0057]
The case distal end portion 52 accommodates the ultrasonic transducer 10 inside with the case
main body 51, and projects the small diameter cylindrical portion 32 of the front member 30 in a
vibratable state from the through hole opened at the distal end . The case tip 52 may be formed
of the same resin as the case main body 51, or may be formed of other materials, and the
material is not limited. The method for connecting the case tip 52 and the case body 51 may be
engagement of an external thread and an internal thread, or any other removable connection
method.
[0058]
Next, the operation of the ultrasonic vibration device 1 and the ultrasonic transducer 10 having
the above-described configuration will be described with reference to FIGS. When ultrasonic
vibration is generated in the ultrasonic vibration apparatus 1, an alternating voltage (drive
voltage) having a resonance frequency is supplied to the ultrasonic vibrator 10 from an external
power supply (drive circuit). The drive voltage is supplied to the piezoelectric element 21 via the
electrode plate 22 of the piezoelectric element unit 20. The piezoelectric element 21 to which the
drive voltage is supplied vibrates at a resonance frequency, here a frequency in the ultrasonic
region.
[0059]
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The ultrasonic vibration of the plurality of piezoelectric elements 21 is transmitted to the entire
ultrasonic transducer 10, and the ultrasonic transducer 10 ultrasonically vibrates. The ultrasonic
transducer 10 is housed in a state in which a gap is formed between the outer circumferential
surface of the support portion 33 and the inner circumferential surface of the groove portion 54
of the case 50 with the inner surface of the case 50, Even inside the case 50, ultrasonic vibration
can be performed.
[0060]
The ultrasonic vibration in the ultrasonic transducer 10 is amplified in the front member 30 and
emitted from the vibration emission surface 32 A of the small diameter cylindrical portion 32.
For example, when the ultrasonic vibration apparatus 1 is an ultrasonic knife, the knife attached
to the vibration radiation surface 32A is ultrasonically vibrated.
[0061]
Here, the prevention of relative rotation between the case 50 and the ultrasonic transducer 10,
which is a feature of the present embodiment, will be described with reference to FIGS. 4 to 7.
FIG. For example, when the ultrasonic vibration device 1 is used as an ultrasonic knife as
described above, a plurality of types of scalpels are attached to and detached from the vibration
radiation surface 32A of the ultrasonic vibration device 1. When the attachment and detachment
of the knife is performed using the engagement of the male screw and the female screw, a force
is applied to the vibration radiation surface 32A, that is, the ultrasonic transducer 10 in the
rotational direction around the central axis L. On the other hand, since the case 50 is held by the
operator, a force in the relative rotational direction acts between the case 50 and the ultrasonic
transducer 10.
[0062]
When a force rotating about the central axis L is applied to the vibration radiation surface 32A, a
rotational force is transmitted to the support portion 33 via the small diameter cylindrical
portion 32 and the large diameter cylindrical portion 3. When the support portion 33 rotates
around the central axis L, the end surface 33A of the support portion 33 and the contact surface
54A of the groove portion 54 of the case main body 51 come into surface contact. Thereby,
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relative rotation between the case 50 and the ultrasonic transducer 10 is prevented.
[0063]
The contact surface between the end surface 33A and the contact surface 54A is formed only by
the flange portion 34 because the end surface 33A is formed in an L shape by the flange portion
34 and the outer end portion 35 as shown in FIG. Wider compared to the case. Therefore, the
surface pressure or stress on the contact surface becomes low, and the support portion 33
provided with the end face 33A, the groove 54 of the case main body 51 provided with the
contact surface 54A, and the like are hardly deformed or broken. Furthermore, the choice of the
material which comprises the case main body 51 becomes wide.
[0064]
On the other hand, as shown in FIG. 7, the thickness of the case body 51 (the hatched portion in
FIG. 7) can be increased in portions other than the portion where the groove 54 is formed in the
case body 51. Therefore, the strength of the case body 51 can be easily secured. That is, the
inner surface of the case main body 51 can be protruded to the vicinity of the front surface
member 30 in the portion where the support portion 33 is not disposed. In other words, the
inner surface of the case main body 51 can be protruded to the region where the support portion
33 is disposed, and the thickness from the outer surface to the inner surface of the case main
body 51 can be increased. On the other hand, the portion where the support portion 33 is
disposed can have the same thickness as in the case where the conventional disk-like support
portion is used. Then, the average thickness of the case body 51 in the circumferential direction
can be increased without increasing the outer diameter of the case body 51, and the strength of
the case body 51 can be easily secured. As a result, it is possible to ensure the strength of the
case body 51, the ease of gripping in the ultrasonic vibration device 1, and the ease of operation.
[0065]
According to the above configuration, the end surface 33A formed in the support portion 33 and
a part of the inner surface of the case 50 for housing the ultrasonic transducer 10, specifically,
the surface is in contact with the end surface 33A. Contact with the contact surface 54A of the
groove 54 can prevent the case 50 and the ultrasonic transducer 10 from rotating relative to
each other about the central axis L. On the other hand, when the shape of the end face 33A is
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divided into the radial outer side and the inner side and compared, the area of the outer side
portion is formed to be larger than the area of the inner side. Securing and control of weight
increase can be achieved. As a result, the ease of operation in the ultrasonic vibration apparatus
1 can be secured.
[0066]
Generally, when a force is applied in a direction in which the case 50 and the ultrasonic
transducer 10 rotate relative to each other about the central axis L, the radially outer portion of
the end face 33A is larger than the radially inner portion. Power works. Therefore, when the
radially outer portion and the radially inner portion are formed to have equal areas, the surface
pressure or stress acting on the radially outer portion is greater than the surface pressure or
stress of the radially inner portion. Will also be high. As in the ultrasonic transducer 10
according to the present embodiment, when the radially outer portion is formed to have a wider
area as compared with the radially inner portion, the radially outer side at the end face 33A is
compared with the above case. The surface pressure and stress of the part of As a result, it is
possible to prevent deformation and destruction of the end face 33A, and to improve the
reliability of tip replacement such as a knife.
[0067]
Furthermore, as compared with the method of increasing the plate thickness of the entire
support portion 33 to increase the area of the end face 33A, the area of the radial inner portion
of the end face 33A is reduced, so the volume of the support portion 33 is reduced. Can prevent
weight increase or reduce weight. As a result, the weight increase of the ultrasonic transducer 10
can be prevented or reduced. More preferably, it is desirable to make the area of the radially
inner portion smaller than the area of the radially outer portion in the entire radial cross section
of the support portion 33 as in the end face. By doing this, the weight increase of the support
portion 33 and the ultrasonic transducer 10 can be more reliably prevented or the weight
reduction can be achieved more effectively. As a result, it is possible to ensure the strength of the
case body 51, the ease of gripping in the ultrasonic vibration device 1, and the ease of operation.
[0068]
As in the present embodiment, the ring plate-shaped flange portion 34 is extended radially
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outward from the outer surface of the support portion 33, and the cylindrical outer end portion
35 is extended from the outer end of the flange portion 34 in the central axis L direction. Thus,
the area of the radially outer portion of the end surface 33A of the support portion 33 can be
made larger than the area of the radially inner portion. For example, when the outer end 35 is
extended in one direction from the outer end of the flange 34, the end face 33A is formed in an L
shape, and when the outer end 35 is extended in both directions, the end face 33A is formed in a
T It will be. In addition, the diameter of the surface on the side of the end face 33A which is the
opposite surface of the support portion 33 and the surface on the side of the vibration emission
surface 32A without dividing the support portion 33 into the flange portion 34 and the outer end
portion 35 It may be formed to be continuously separated outward in the direction.
[0069]
Furthermore, the contact area between the support portion 33 and the inner surface of the case
50 can be increased while suppressing the weight increase of the support portion 33 as
compared to the case where the support portion 33 is formed in a plate shape. The outer end
portion 35 is a cylindrically curved plate member extending in the direction of the central axis L
and in the circumferential direction, and is capable of coming into contact with the inner surface
of the case 50 on the outer peripheral surface thereof. In other words, a gap is provided between
the outer peripheral surface of the outer end portion 35 and the inner surface of the case 50, and
the outer peripheral surface of the outer end portion 35 when the ultrasonic vibration device 1 is
tilted, etc. The inner surface of the case 50 is in contact with the inner surface.
[0070]
Therefore, by adjusting the length of the outer end 35 in the central axis L direction, the contact
area between the support 33 and the inner surface of the case 50 can be easily adjusted.
Furthermore, even if the length in the direction of the central axis L at the outer end portion 35
is increased, for example, the increase in weight of the support portion 33 is suppressed as
compared to the case where the thickness of the entire support portion 33 is increased. it can.
[0071]
Even when the ultrasonic transducer 10 of the present embodiment is housed inside the case 50,
the vibration of the ultrasonic transducer 10 is unlikely to be inhibited. That is, when the
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ultrasonic transducer 10 is housed inside the case 50, the ultrasonic transducer 10 is supported
in a state of being spaced from the inner surface of the case 50 by the support portion 33
coming into contact with the inner surface of the case 50 . In this state, when the piezoelectric
element unit 20 is vibrated, for example, longitudinally vibrated at the natural frequency of the
ultrasonic transducer 10 or at a frequency close to the natural frequency, the end of the front
member 30 of the ultrasonic transducer 10, A standing wave is generated with the end of the
backing member 40 as an antinode. In this case, when the support portion is disposed at the
position of the node in the standing wave, the influence of the support portion 33 on the
longitudinal vibration of the ultrasonic transducer 10, for example, suppression of the
longitudinal vibration can be suppressed.
[0072]
FIG. 9 is a plan view for explaining another embodiment of the front surface member of FIG. 4
and FIG. 10 is a front view for explaining the configuration of the support portion of FIG. As in
the above-described embodiment, the support portion 33 of the front surface member 30 may be
configured by the flange portion 34 and the outer end portion 35, and as shown in FIGS. 9 and
10, the support of the front surface member 130. The portion 133 may be composed of the
flange portion 34 and the side end portions 135 and 135.
[0073]
The side end portions 135 are disposed at both ends in the circumferential direction centering on
the central axis L in the flange portion 34, and extend from the end of the flange portion 34
toward the contact surface 31A along the central axis L direction. Plate member. In other words,
the side end portion 135 is a plate-like member extending in the direction of the central axis L
while intersecting the circumferential direction, and the flange portion 34 and the side end
portions 135 and 135 have a U-shape in front view Are arranged side by side. Further, the side
end portion 135 is provided with an end face 33A.
[0074]
FIG. 11 is a front view illustrating yet another embodiment of the front surface member of FIG. 4;
Furthermore, as shown in FIG. 11, the support portion 233 of the front surface member 230 may
be configured of the flange portion 34 and the side end portions 235 and 235.
04-05-2019
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[0075]
The side end portions 235 are disposed at both ends in the circumferential direction around the
central axis L in the flange portion 34, and from the end of the flange portion 34 to the contact
surface 31A and the small diameter cylindrical portion 32 along the central axis L direction. It is
a pair of plate-shaped member extended toward. In other words, the flange portion 34 and the
side end portions 235 and 235 are arranged side by side in an H shape in front view. Further, the
side end portion 235 is provided with an end face 33A.
[0076]
As described above, the ring plate-shaped flange portion 34 extends radially outward from the
outer peripheral surface of the support portions 133 and 233, and the plate-shaped side end
portion in the central axis L direction from the circumferential side end of the flange portion 34
By extending 135 and 235, the area at the end face 33A can be made wider than the crosssectional area of the plane cut by a plane including the central axis L between the end face 33A
and the end face 33A of the support portion 133,233. The side ends 135 and 235 may be
arranged to extend in one direction from the side ends of the flange portion 34 as described
above, or may be arranged to extend in both directions.
[0077]
The technical scope of the present invention is not limited to the above embodiment, and various
modifications can be made without departing from the scope of the present invention. For
example, although the above embodiment has been described in the case where the three
support portions 33 are arranged at equal intervals in the circumferential direction around the
central axis L, the number of support portions 33 is limited to three. It may be less than three or
more than three.
[0078]
Ultrasonic transducer ... 10, front member ... 30, 130, backing member ... 40, piezoelectric
element ... 21, electrode plate ... 22, support part ... 33, 133, end face ... · · · 33A, flange portion · · ·
34, outer end portion · · · 35, case body (frame body) · · · 51, side end portion · · ·135
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