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JP2007036643

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007036643
PROBLEM TO BE SOLVED: To provide a simple configuration capable of making the heights of
the ultrasonic wave emitting surface 8 of each BLT element 1 uniform in an ultrasonic transducer
constituted by attaching a plurality of BLT elements 1 to a frame. SOLUTION: Each BLT element
1 is attached to a frame via a holding structure 20. This holding structure 20 forms a female
screw 27 screwed to the screw shaft 10 of the BLT element 1 and a holding member 23 in which
a contact portion (convex portion of the snap portion 25) 30 is in contact with the frame. And a
cork member 22 disposed between the holding member 23 and the rear mass 3 and having
sound insulation and elasticity. Before attaching each BLT element 1 to the frame, the holding
member 23 is rotated so that the distance between the ultrasonic radiation surface 8 and the
contact part 30 is made uniform with the plurality of BLT elements 1. [Selected figure] Figure 1
Ultrasonic transducer, holding structure for BLT element, BLT element, and method for
manufacturing ultrasonic transducer
[0001]
The present invention mainly relates to the configuration of an ultrasonic transducer provided
with a large number of BLT elements (bolt-clamped Langevin elements) in an array.
[0002]
Patent Document 1 discloses an ultrasonic transducer in which a plurality of vibration elements
are fixed to a support.
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1
The configuration of Patent Document 1 relates to an ultrasonic transducer such as a 180 °
sonar, in which holders for fixing a vibrating element are provided on both sides of a cylindrical
drum, and the vibrating element is inserted into the holder. A concave groove is provided, and a
hook for locking is provided at the tip. In Patent Document 1, by improving the dimensional
accuracy of the concave groove portion of the element holder, the accuracy of the arrangement
of the vibrating elements is improved, and the acoustic performance can be improved.
[0003]
Further, in the prior art portion of Patent Document 1, the radiation surface side of the vibrating
element is mold-bonded to a urethane rubber sheet, and the vibrating element attached with
sponge or cork is wound around a cylindrical drum to vibrate. An arrangement in which elements
are arranged radially is also disclosed. Japanese Utility Model Publication No. 7-17030 (FIG. 1,
FIG. 4 regarding the prior art)
[0004]
Here, in recent years, a bolt-clamped Langevin Type Transducer (hereinafter referred to as a BLT
element) is widely used as a transducer for an ultrasonic wave generator because of high output
and excellent durability. It is coming. Therefore, it is conceivable to apply this BLT element as a
vibration element of Patent Document 1 mentioned above.
[0005]
However, if the resonant frequencies of a plurality of BLT elements used in an ultrasonic
transducer are to be aligned, it is inevitable that the dimensions of the electrostrictive elements
are not constant and they are uneven, and the dimensional error of the components of the BLT
elements Accumulation makes the dimensional error of the whole BLT element considerable.
Therefore, it is extremely difficult to align the ultrasonic radiation planes of the BLT elements at
the same position.
[0006]
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2
In addition, as shown in FIG. 7, the ultrasonic transducer may be configured to arrange a
plurality of BLT elements at equal intervals and perform beam synthesis. In this configuration,
when it is desired to tilt the beam by an angle θ0, driving is performed while shifting the phase
of each BLT element by 2π (b × sin θ0) / λ, where b is the distance between BLT elements
and λ is the wavelength. However, the directivity function representing the ideal directivity
characteristic at that time is D (.theta.) = W ((b.sin .theta.0 / .lambda.)-(B.sin .theta. /), Where
.theta. It is represented by λ)).
[0007]
Therefore, in order to obtain good directivity characteristics, b · sin θ 0 in the above equation
must be made equal, and for that purpose, the radiation surface of the BLT element should be
made flush (the radiation surface should not Two points are required: elimination of dents) and
elimination of variations in the distance between the BLT elements (distance b). Therefore, for
example, it is not preferable that the radiation surface protrudes to the front side like the vibrator
of # 3 in FIG.
[0008]
In this regard, the inventor of the present application has simulated and calculated the influence
on the directivity characteristics by the projection / recession of the BLT element in the case of
the above-described beam synthesis. In this simulation, the case where nine BLT elements are
arranged is calculated, and the distance b between the BLT elements is λ, and the beam tilt
angle θ 0 is 30 °. The results are shown as three graphs in FIG. In FIG. 8, (a) is an ideal case
where the radiation planes of all the BLT elements are flush, (b) is a case where only the radiation
plane of the third BLT element protrudes by λ / 10 (c ) Is the case where only the radiation
plane of the third BLT element is recessed by λ / 10.
[0009]
As shown in FIG. 8, when all the BLT elements are flush (a), a very good directivity is obtained
with a large main lobe appearing at an angle of 30 ° and small side lobes appearing on both
sides thereof. ing. On the other hand, when some BLT elements have jumped out (b) or when
there is a dent (c), the main lobe becomes smaller while the side lobe becomes relatively larger,
04-05-2019
3
for example, in the case of scanning sonar, It has become a directional characteristic that a false
image tends to occur. It can also be understood from FIG. 8 that it is important in order to obtain
excellent directivity characteristics that the emission surfaces of the plurality of BLT elements be
flush with one another without escaping or denting of the emission surface of each BLT element.
[0010]
Here, in general, in order to obtain the above-mentioned clean directivity characteristics, it is
desirable that the amount of protrusion (recession amount) of each element on the radiation
surface allowed by the time phase difference be within λ / 32. Then, for example, when the
vibration frequency of the BLT element is 80 kHz, the value of λ / 32 is 0.59 mm. Therefore, the
positioning of the radiation planes of all the BLT elements within this small tolerance means that
even if the dimensional accuracy of the concave groove is improved by the configuration of
Patent Document 1, the above-mentioned element non-uniformity or dimensional error may
occur. It is extremely difficult because of cumulative circumstances.
[0011]
As described above, in order to accurately position the radiation surface of the BLT element, it is
also conceivable to use an arraying jig or directly measure the arraying accuracy with a laser
measuring instrument after assembly. However, if the position of the radiation plane of the BLT
element is checked every time by a laser measurement device, the efficiency of assembly is
degraded, and it takes much time and labor.
[0012]
The present invention has been made in view of the above circumstances, and its main object is
to mount a plurality of BLT elements simply by attaching them to a frame without using
alignment jigs or measuring the positional accuracy of the radiation surface after assembly. It is
an object of the present invention to provide a configuration capable of aligning the position of
the radiation surface of the light emitting element without popping out or denting.
Means and effect for solving the problem
[0013]
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4
The problem to be solved by the present invention is as described above, and next, means for
solving the problem and its effect will be described.
[0014]
According to a first aspect of the present invention, there is provided an ultrasonic transducer
configured by attaching a plurality of BLT elements to a frame, which is configured as follows.
Each of the BLT elements is attached to the frame via a holding structure.
The holding structure is screwed with a screw shaft of the BLT element, and is disposed between
the holding member having a contact portion formed in contact with the frame, the BLT element
and the holding member, and sound insulation And an elastic member having elasticity.
[0015]
With this configuration, in each of the plurality of BLT elements, the BLT element is attached to
the frame via the holding member by rotating the holding member in advance and adjusting the
position of the contact portion to be the same height. Sometimes, the radiation surface of the BLT
element can be positioned at the same height without popping out or denting. As described
above, since the radiation surface can be simultaneously positioned only by attaching the BLT
element to the frame, an ultrasonic transducer excellent in acoustic performance can be obtained
with a small manufacturing cost and man-hours.
[0016]
In the ultrasonic transducer described above, it is preferable that the set hole is formed in the
frame, and the set hole is engaged with a part of the holding member.
[0017]
According to this configuration, the BLT element can be easily attached to the frame with a
simple configuration in which a part of the holding member is engaged with the set hole.
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[0018]
In the above ultrasonic transducer, preferably, the holding member is provided with a snap
portion, and the snap portion is engaged with the set hole.
[0019]
With this configuration, an adequate snap feeling can be obtained when the snap portion of the
holding member is completely engaged with the set hole, so that the BLT element can be
attached to the frame easily and reliably, and assemblability of the ultrasonic transducer
Excellent.
[0020]
In the ultrasonic transducer described above, preferably, the elastic member is disposed rearward
of the rear mass of the BLT element, and the holding member is disposed further rearward of the
elastic member.
[0021]
With this configuration, a simple and rational layout is realized in which the ultrasonic radiation
surface of the front surface of the BLT element can be positioned by rotating the holding member
on the rear side to compress the elastic member.
[0022]
In the ultrasonic transducer described above, it is preferable that a path for passing a lead wire
connected to the electrode of the BLT element is formed inside the holding member.
[0023]
According to this configuration, the wiring path of the lead from the power supply source to the
electrode of the BLT element can be easily secured, and the lead can be protected by the holding
member so as not to damage the lead.
[0024]
According to a second aspect of the present invention, there is provided a holding structure for
holding a BLT element with respect to a frame of an ultrasonic transducer, configured as follows.
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An elastic member which is screwed with a screw shaft of the BLT element and which has a
contact portion formed to contact the frame, an elastic member disposed between the BLT
element and the support member and having sound insulation And.
[0025]
With this configuration, in each of the plurality of BLT elements, the BLT element is attached to
the frame via the holding member by rotating the holding member in advance and adjusting the
position of the contact portion to be the same height. Sometimes, the radiation surface of the BLT
element can be positioned at the same height without popping out or denting.
As described above, since the radiation surface can be simultaneously positioned only by being
attached to the frame, the labor and cost for manufacturing the ultrasonic transducer can be
reduced.
[0026]
According to a third aspect of the present invention, there is provided a BLT element configured
as follows.
A vibrating element, a front mass provided with an ultrasonic radiation surface on the front
surface, a rear mass disposed opposite to the front mass with the vibrating element interposed
therebetween and resonating with the front mass, the front mass, the vibrating element, A screw
shaft for connecting the rear mass, a holding member screwed to the screw shaft, and an elastic
member disposed between the rear mass and the holding member and having sound insulation.
[0027]
With this configuration, when the BLT element is attached to the reference member, the radiation
surface of the BLT element is blown when the holding member is previously rotated and adjusted
to have the same height in each of the plurality of BLT elements. It can be positioned at the same
height without protrusion or depression.
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7
As described above, since the radiation surface can be simultaneously positioned only by
attaching to the reference member, the labor and cost for manufacturing the acoustic device can
be reduced.
[0028]
According to a fourth aspect of the present invention, there is provided a method of
manufacturing an ultrasonic transducer having a configuration in which a plurality of BLT
elements are attached to a frame as follows.
The holding member in which the contact portion that can be in contact with the frame is formed
is screwed to the screw shaft provided in the BLT element in a state where the elastic member
having sound insulation is positioned between the holding member and the BLT element. Match.
By rotating the holding member and moving the screw while compressing the elastic member,
the distance between the contact portion and the ultrasonic radiation surface of the BLT element
is adjusted to be the same among the plurality of BLT elements.
Thereafter, the BLT element is attached to the frame such that the contact portion of the holding
member is in contact with the frame.
[0029]
By this method, in each of the plurality of BLT elements, the holding member is rotated and
screwed in advance to adjust the distance between the contact portion and the ultrasonic
radiation surface to be the same, thereby holding the BLT element. When attached to the frame
through the member, the radiation surface of the BLT element can be positioned at the same
height without popping out or denting.
As described above, since the radiation surface can be simultaneously positioned only by being
attached to the frame, the labor and cost for manufacturing the ultrasonic transducer can be
04-05-2019
8
reduced.
[0030]
Next, an embodiment of the invention will be described. FIG. 1 is an explanatory view showing
how the holding structure is attached to the BLT element, FIG. 2 is a side view showing the
configuration of the position adjusting device, and FIG. 3 is a view showing how the position of
the holding member is adjusted. FIG. 4 is an enlarged cross-sectional view showing how the BLT
element is attached to the frame. FIG. 5 is an enlarged cross-sectional view showing the
completed ultrasonic transducer with the BLT element attached to the frame.
[0031]
The BLT element 1 shown on the lower side of FIG. 1 has a configuration in which piezoelectric
elements (oscillation elements) 4 and 5 made of piezoelectric ceramic such as PZT are
sandwiched between the front mass 2 and the rear mass 3. Electrodes 6 for applying a voltage to
the piezoelectric elements 4 are attached between the piezoelectric elements 4. Lead wires
(conductors) 7 are electrically connected to the electrodes 6. In the present embodiment, the
front mass 2 and the rear mass 3 are both made of metal. An ultrasonic radiation surface 8 is
formed on the front surface of the front mass 2.
[0032]
An axial hole 9 is formed on the surface of the front mass 2 opposite to the ultrasonic radiation
surface 8, and an external screw formed at one end of the screw shaft 10 is screwed into the
axial hole 9. The screw shaft 10 extends in the axial direction while inserting through the axial
holes of the piezoelectric elements 4 and 5 and the rear mass 3, and forms an external screw at a
portion projecting from the rear mass 3, and the nut 11 is screwed on the external screw ing.
[0033]
The BLT element 1 is configured by connecting and fixing the front mass 2, the piezoelectric
elements 4 and 5, and the rear mass 3 by rotating and tightening the nut 11. Then, when a
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voltage is applied to the electrode 6 through the lead wire 7 to vibrate the piezoelectric elements
4 and 5 at a predetermined frequency, the front mass 2 and the rear mass 3 resonate by this
vibration, and the ultrasonic waves of the front mass 2 Ultrasonic waves are emitted from the
radiation surface 8.
[0034]
In the present embodiment, a ring-shaped washer 21 and a cork member (elastic member) 22 are
inserted through a portion on one side of the screw shaft 10 (a portion on the opposite side to
the front mass 2 screwing side). The cork member 22 has sound insulation and is configured to
have appropriate elasticity. The cork member 22 is disposed behind the rear mass 3 of the BLT
element 1.
[0035]
Further, a holding member 23 is disposed rearward of the cork member 22, and the holding
member 23 is screwed to an end of the screw shaft 10. The holding member 23 has a
configuration in which the snap portion 25 protrudes to one side in the axial direction from the
base 24 formed in a substantially cylindrical shape.
[0036]
An axial hole 26 is formed in the base 24 in a penetrating manner, and at one end side of the
axial hole 26, a female screw 27 which can be screwed to the screw shaft 10 is formed. Also, a
contact surface 28 is formed on the end face of the base 24 opposite to the side on which the
female screw 27 is formed. The abutment surface 28 is formed in an annular shape so as to
surround the base end of the snap portion 25.
[0037]
Further, an insertion hole 29 is diagonally bored in the base 24, one end of which is opened to
the outer peripheral surface of the base 24, and the other end is connected to the axial hole 26.
The insertion hole 29 is configured to allow the lead wire 7 to be inserted therethrough.
04-05-2019
10
[0038]
The snap portion 25 is formed in a substantially cylindrical shape, and an annular convex portion
(contact portion) 30 is formed on the outer peripheral surface of the tip end portion. Further, a
plurality of slits 31 of appropriate length are formed at equal intervals in the circumferential
direction, whereby the tip end portion of the snap portion 25 can be easily elastically deformed
radially inward.
[0039]
Among the configurations described above, the washer 21, the cork member 22, and the holding
member 23 constitute a holding structure 20 for holding the BLT element 1 in a frame described
later. In the holding structure 20, the cork member 22 is disposed between the holding member
23 and the nut 11 on the BLT element 1 side, and the holding member 23 is rotated to move in a
direction toward the ultrasonic radiation surface 8. At the same time, the cork member 22 is
appropriately compressed in the axial direction.
[0040]
Then, after attaching the holding structure 20 to the rear side of the BLT element 1 in this way,
positioning of the holding member 23 with respect to the ultrasonic radiation surface 8 of the
front mass 2 is performed using the position adjusting device 40 shown in FIG. Do.
[0041]
As shown in FIG. 2, the position adjusting device 40 has a flat base 41, and the base end of the
bar support 42 is fixed on the base 41.
At one end of the bar support 42, one end side of the conductive bar 43 is rotatably supported.
Further, the base end of the contact support 44 is fixed on the base 41, and the contact pin 45 is
attached to the tip of the contact support 44. Further, on the base 41, an LED 46 as a conduction
notification means is installed.
04-05-2019
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[0042]
The conductive bar 43 is formed of a conductive metal in a square rod shape, and is connected to
the LED 46. Further, the position adjustment device 40 includes a power source 47 such as a
battery. The LED 46 and the conductive bar 43 are electrically connected in series to the positive
electrode of the power source 47. On the other hand, the contact pin 45 is electrically connected
to the negative electrode of the power supply 47.
[0043]
A horizontal set surface 48 for contacting the ultrasonic radiation surface 8 of the BLT element 1
is provided on the base 41. The BLT device 1 is fixed from the upper side by the pressing
member 49 in a state where the ultrasonic radiation surface 8 on the front side of the BLT device
1 is in contact with the set surface 48 with the ultrasonic radiation surface 8 facing downward
and properly positioned in the horizontal direction. Ru.
[0044]
Further, the rotating jig 50 is attached to the BLT element 1 set on the set surface 48 of the
position adjustment device 40 as described above. The rotating jig 50 is a substantially discshaped member and has an engaging hole 51 at its central portion. The engaging hole 51 is
against the base 24 of the holding member 23 on the rear side of the BLT element 1. Relatively
non-rotatably fitted. When the rotating jig 50 is attached to the base 24 as described above, the
tip of the snap portion 25 is inserted through the engagement hole 51 of the rotating jig 50 and
protrudes upward from the rotating jig 50. Become.
[0045]
Next, the conductive bar 43 is rotated from the state shown in FIG. 2, and the conductive bar 43
is brought into contact with the tip of the snap portion 25 of the holding member 23 attached to
the BLT element 1. This contact state is shown in FIG. 3A, in which the conductive bar 43 and the
contact pin 45 are slightly separated.
04-05-2019
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[0046]
When the holding member 23 is rotated in the direction in which the holding member 23 is
tightened by holding the peripheral portion of the rotating jig 50 from the state shown in FIG.
Therefore, as the holding member 23 rotates, the cork member 22 is compressed in the axial
direction while being gradually screwed downward through the screwing portion of the screw
shaft 10 and the female screw 27 shown in FIG. As a result, the snap portion 25 descends, and
the position of the convex portion 30 described above also descends little by little.
[0047]
Further, since the tip of the snap portion 25 is lowered with the rotation of the rotating jig 50,
the conductive bar 43 is also gradually lowered by its own weight, and eventually the conductive
bar 43 is a contact pin as shown in FIG. The contact 45 is energized to turn on the LED 46.
Therefore, rotating the rotating jig 50 little by little while observing the state of the LED 46, and
stopping the rotation of the rotating jig 50 immediately when the LED 46 is turned on, the
position of the holding member 23 with respect to the ultrasonic radiation surface 8 The position
of the convex portion 30 can be positioned at a predetermined position.
[0048]
In this embodiment, the position adjustment device 40 is used to position the convex portion 30
for each of the plurality of BLT elements 1 used for the ultrasonic transducer. Thereby, the
positions of the holding members 23 in the plurality of BLT elements 1 (specifically, the distance
from the ultrasonic radiation surface 8 to the convex portion 30) can be made uniform.
[0049]
Here, the position adjustment device 40 has a layout in which the pivot point (bar support 42) of
the conductive bar 43 is disposed on one side across the set position of the BLT element 1, and
the contact pin 45 is disposed on the other side. There is. Therefore, since the tip of the
conductive bar 43 moves up and down so as to amplify the vertical movement of the holding
member 23, the position adjustment of the holding member 23 can be performed extremely
04-05-2019
13
precisely. Further, the disc portion gripped by the hand of the rotating jig 50 is configured to
have a relatively large diameter, and fine adjustment of the rotation angle of the holding member
23 compared to the case where the holding member 23 is directly gripped and rotated by hand.
(Thus, fine adjustment of the upper and lower positions) can be performed with high accuracy.
[0050]
As described above, the position adjusting device 40 is provided with various devices for
improving the accuracy of the positioning. Therefore, by using this position adjustment device
40, the variation in the distance from the ultrasonic radiation surface 8 of the BLT element 1 to
the convex portion 30 can be made extremely small (specifically, within approximately ± 0.1
mm). I can do it.
[0051]
After the positioning of the holding member 23 is finished, the lead wire 7 is inserted into the
insertion hole 29 from the outer peripheral side of the base body 24 and passed through the
axial hole 26 and pulled out from the tip end of the snap portion 25. . As described above, by
passing the inside of the holding member 23 to the lead wire 7, the wiring path of the lead wire 7
is secured, and at the same time, the lead wire 7 is protected from rubbing and damage with
other members. Can.
[0052]
Then, the BLT element 1 in which the positions of the holding members 23 are aligned as
described above is attached as shown in FIG. 4 to the frame 15 as a base frame (reference
member) in the ultrasonic transducer. In the present embodiment, the frame 15 is formed by
processing an aluminum material into a spherical shape by a 5-axis machining center.
[0053]
The frame 15 is provided with a large number of storage holes 16 for storing the BLT element 1
arranged therein, and at the inner bottom portions of the storage holes 16, set holes 17 are
04-05-2019
14
formed. In this configuration, a ring-shaped cork member 18 is attached to the root portion of
the snap portion 25, and the snap portion 25 is inserted into the set hole 17 to lock the convex
portion 30 of the tip to the open end. Thus, the BLT element 1 can be easily attached and
attached to the frame 15.
[0054]
In addition, when the insertion of the snap portion 25 into the set hole 17 is completed, the snap
portion 25 elastically deformed inward is snapped back to obtain an appropriate snap feeling,
and the assembling worker can obtain the BLT element 1 It can be confirmed by feeling that it is
firmly assembled to the frame 15 by hand, which is convenient. After that, the ultrasonic
transducer 60 is completed by connecting the lead wire 7 to an appropriate power supply
source, and this ultrasonic transducer 60 is an acoustic device such as a scanning sonar, a tidal
current meter, a measuring sonar, etc. Used for
[0055]
When the snap portion 25 is fitted, the cork member 18 is axially compressed between the inner
bottom surface 19 of the storage hole 16 and the contact surface 28 of the holding member 23,
and the reaction force thereof is It acts in the direction in which the snap portion 25 is pulled out
of the set hole 17. However, since the convex portion 30 of the snap portion 25 abuts on and is
caught by the open end of the set hole 17, removal of the snap portion 25 from the set hole 17 is
prevented. In other words, the cork member 18 always functions to keep the convex portion 30
in contact with the opening end of the set hole 17 so as to always exert an urging force for
positioning the BLT element 1.
[0056]
Here, the positional accuracy of the set hole 17 (including the portion of the open end with which
the convex portion 30 of the snap portion 25 contacts) depends on the machining accuracy of
the machining center, and in general, the positioning can be performed with good accuracy. it
can. Then, the distance between the convex portion 30 of the snap portion 25 and the ultrasonic
radiation surface 8 of the BLT element 1 is the dimensional deviation of the piezoelectric
elements 4 and 5 or the dimensional error of the entire BLT element 1 by the position adjusting
device 40 shown in FIG. Regardless, they are pre-adjusted to be the same. Therefore, just by
04-05-2019
15
attaching the BLT element 1 to the frame 15 through the holding structure 20 as shown in FIGS.
4 and 5, the ultrasonic radiation surfaces 8 of the plurality of BLT elements 1 can be accurately
positioned to align on the same spherical surface. As a result, it is possible to realize an alignment
accuracy suitable for applications in which the BLT element 1 is phasing driven, and to reduce
the assembly cost and the number of assembly steps of the ultrasonic transducer 60.
[0057]
In addition, since the fixing of the BLT element 1 to the frame 15 and the positioning of the
ultrasonic radiation surface 8 can be performed by a simple mounting operation in which the
snap portion 25 of the holding member 23 is engaged with the set hole 17, manufacturing is
extremely simplified. There is.
[0058]
As described above, the ultrasonic transducer 60 according to the present embodiment is
configured by attaching each of the plurality of BLT elements 1 to the frame 15 via the holding
structure 20.
The holding structure 20 is screwed with the screw shaft 10 of the BLT element 1 and has a
holding member 23 in which a convex portion 30 contacting the frame 15 is formed, the BLT
element 1 and the holding member 23. And a soundproofing cork member 22 disposed
therebetween.
[0059]
The configuration shown in FIG. 1 can also be understood as a BLT element with a holding
structure 20 for the frame 15. That is, in the present embodiment, the piezoelectric elements 4
and 5, the front mass 2 having the ultrasonic radiation surface 8 on the front surface, and the
piezoelectric element 4 and 5 disposed on the opposite side to the front mass 2 A rear mass 3
resonating with the second mass, a screw shaft 10 for connecting the front mass 2, the
piezoelectric elements 4 and 5, and the rear mass 3, a holding member 23 screwed to the screw
shaft 10, and the rear mass A BLT element is provided, which comprises a cork member 22
disposed between the third and the holding member 23 and having sound insulation.
04-05-2019
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[0060]
Therefore, in each of the plurality of BLT elements 1, the holding member 23 is previously
rotated to adjust the positions of the convex portions 30 so as to be at the same height, whereby
the BLT element 1 is framed through the holding member 23. The ultrasonic radiation surface 8
of the BLT element 1 can be positioned at the same height without popping or denting. As
described above, since the radiation surface can be simultaneously positioned only by attaching
the BLT element 1 to the frame 15, the ultrasonic transducer 60 suitable for phasing drive of the
BLT element 1 can be obtained with small manufacturing cost and man-hours. .
[0061]
Further, in the ultrasonic transducer 60 of the present embodiment, the set hole 17 is formed in
the frame 15, and the set hole 17 is engaged with the snap portion 25 formed in the holding
member 23. doing. Therefore, a simple configuration for attaching the BLT element 1 to the
frame 15 can be realized.
[0062]
Further, in the present embodiment, the holding member 23 is provided with a snap portion 25,
and the snap portion 25 is engaged with the setting hole 17. Therefore, when the snap portion
25 is completely engaged with the set hole 17, the elastic deformation of the snap portion 25 is
released and a proper snap feeling can be obtained. Therefore, the assembly worker can easily
and reliably attach the BLT element to the frame 15 while confirming the feeling of the snap
feeling.
[0063]
Further, in the ultrasonic transducer 60 according to the present embodiment, the cork member
22 is disposed rearward of the rear mass 3 of the BLT element 1, and the holding member 23 is
disposed further rearward of the cork member 22. There is. Therefore, by rotating the holding
member 23 on the rear side of the BLT element 1 to compress the cork member 22, a simple and
rational layout can be realized in which the ultrasonic radiation surface 8 on the front surface of
the BLT element 1 can be positioned.
04-05-2019
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[0064]
Further, in the present embodiment, the holding member 23 is formed with the axial hole 26 and
the insertion hole 29, and a part of the insertion hole 29 and the axial hole 26 is connected to
the electrode 6 of the BLT element 1. It is a path through which the lead 7 passes. Therefore, the
wiring path of the lead 7 from the power supply source (not shown) installed inside the frame 15
to the electrode 6 of the BLT element 1 can be easily secured, and the coating of the lead 7 Can
be protected by the holding member 23 so as not to be damaged.
[0065]
Moreover, in the present embodiment, the ultrasonic transducer 60 is manufactured by the
following method. That is, first, as shown in FIG. 1, the holding member 23 in which the convex
portion 30 of the snap portion 25 which can be brought into contact with the frame 15 is
formed, the cork member 22 having the sound insulation property is the holding member 23 and
the BLT element 1 And screwed to the screw shaft 10 of the BLT element 1. Next, as shown in
FIG. 3 (b), while pressing the cork member 22, the holding member 23 is rotated and screwed to
move the convex portion 30 and the ultrasonic radiation surface 8 of the BLT element 1. Are
adjusted to be the same for the plurality of BLT elements 1. Thereafter, the BLT element 1 is
brought into contact with the frame 15 (specifically, the opening end at which the set hole 17 is
opened on the inner surface side of the frame 15) so that the convex portion 30 of the holding
member 23 contacts the frame. Attach to 15.
[0066]
By using such a manufacturing method, in each of the plurality of BLT elements 1, the holding
member 23 is rotated in advance and screw movement is performed so that the distance between
the convex portion 30 and the ultrasonic radiation surface 8 becomes equal. By doing this, when
the BLT element 1 is attached to the frame 15 through the holding member 23, the ultrasonic
radiation surface 8 of the BLT element 1 can be positioned at the same height without popping
out or denting. And since positioning of the ultrasonic radiation surface 8 can be performed
simultaneously only by attaching to the flame | frame 15 as mentioned above, the effort and cost
of manufacture of the ultrasonic transducer 60 can be reduced.
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[0067]
6 shows a modified example of the holding structure of the BLT element 1. In the holding
structure 20 of this modified example, in the holding member 23, the male screw portion 33 is
provided in a protruding manner from the base 24 instead of the snap portion 25. . On the other
hand, in the set hole 17 on the frame 15 side, a female screw 34 that can be screwed to the male
screw portion 33 is formed. Also in the holding structure 20 of FIG. 6, the position (position of
the abutment surface 28) of the holding member 23 with respect to the ultrasonic radiation
surface 8 is the same for the plurality of BLT elements 1 using the position adjusting device 40
shown in It has been adjusted.
[0068]
Then, as shown in FIG. 6, each BLT element 1 is attached to the frame 15 by screwing (screwing)
the male screw portion 33 to the female screw 34 of the set hole 17. In this modification, the
cork member 18 as shown in FIG. 4 is omitted, and the abutment surface 28 whose position is
adjusted as described above is in direct contact with the inner bottom surface 19 of the storage
hole 16. The ultrasound emitting surfaces 8 of the BLT element 1 are positioned so as to be flush
with each other. Therefore, in the modification of FIG. 6, the contact surface 28 corresponds to
the contact portion.
[0069]
Although the embodiment and the modification thereof have been described above, the above
configuration can be modified as follows, for example.
[0070]
In the embodiment described above, the ultrasonic radiation surface 8 of the BLT element 1 is
arranged on a spherical surface, but instead, it can be changed to an arrangement on a plane or
an arrangement on a cylindrical surface.
[0071]
The snap portion 25 of the holding member 23 can be changed to a snap portion without slit 31
in which the slit 31 is omitted.
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19
[0072]
Further, the washer 21 can be omitted in the holding structure 20, and the nut 11 can be
changed into a configuration in which the nut 11 is in direct contact with the cork member 22
and sandwiched with the holding member 23.
In this case, in order to reliably receive the end face of the cork member 22, it is preferable to
change the nut 11 for tightening the BLT element 1 to a slightly larger diameter.
[0073]
The method of adjusting the position of the holding member 23 is not limited to the use of the
position adjusting device 40 configured as shown in FIG. 2, and various other methods can be
used.
The point is that any method can be used as long as the position of the holding member 23 can
be adjusted to be a predetermined position determined in advance by rotating the holding
member 23.
[0074]
Explanatory drawing which shows a mode that a holding structure is attached with respect to a
BLT element.
The side view showing the composition of a position adjustment device. The figure which shows
a mode that the position of a holding member is adjusted. The cross-sectional enlarged view
which shows a mode that BLT element is attached to a flame | frame. The cross-sectional
enlarged view which shows a mode that the BLT element was attached to the flame | frame and
the ultrasonic transducer was completed. The cross-sectional enlarged view which shows the
modification of a holding member. FIG. 10 is a conceptual diagram for explaining the case where
the beam is inclined by an angle θ0 when beam combining is performed by arranging a plurality
of BLT elements. FIG. 14 is a graph showing simulation results of influence of the third BLT
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20
element on the directivity characteristics due to the projection / recession in a case where nine
BLT elements are arranged and the beam tilt angle θ0 = 30 °.
Explanation of sign
[0075]
DESCRIPTION OF SYMBOLS 1 BLT element 2 front mass 3 rear mass 4/5 piezoelectric element
(vibrating element) 6 electrode 7 lead wire (lead) 8 ultrasonic radiation surface 10 screw shaft
11 nut 15 frame (reference member) 17 set hole 21 washer 22 cork member 23 Holding
member 25 Snap portion 26 Shaft hole (Lead wire path) 29 Insertion hole (Lead wire path) 30
Convex part of snap part (contacting portion) 50 Rotating jig 60 Ultrasonic transducer
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