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DESCRIPTION JP2015125110

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DESCRIPTION JP2015125110
An object of the present invention is to improve the pressure resistance of an ultrasonic
transducer held by a frame portion. An ultrasonic transducer 2 comprising an ultrasonic
transducer 10 and a frame portion 20 supporting one or both of a rear portion 16 of the
ultrasonic transducer 10 and piezoelectric elements 15a and 15b. I assume. The front portion 11
of the ultrasonic transducer 10 is a portion of the front portion rear end surface side in the front
and rear direction which is a direction along the front portion rear end surface 13 from the
transmission and reception wavefront 12, and the transmission and reception wavefront in the
front and rear direction It includes a cross-sectional area reduced portion 11a in which the crosssectional area of the cross section perpendicular to the front-rear direction is smaller than the
side portion. The ultrasonic transducer 2 further includes an elastic portion 25 provided between
the side surface 14 of the cross-sectional area reducing portion 11a in the front-rear direction
and the frame portion 20 and having elasticity that can be expanded and contracted in the frontrear direction. [Selected figure] Figure 4
Ultrasonic transducer, underwater detection device, and method of manufacturing ultrasonic
transducer
[0001]
The present invention relates to an ultrasonic transducer that transmits and receives ultrasonic
waves, an underwater detection device equipped with an ultrasonic transducer, and a method of
manufacturing an ultrasonic transducer.
[0002]
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1
Conventionally, a transducer having an ultrasonic transducer capable of transmitting and
receiving ultrasonic waves has been known.
For example, in Patent Document 1, a plurality of ultrasonic transducers are arranged with
respect to a frame by inserting an ultrasonic transducer into each of a plurality of holes in a back
plate (frame portion) formed in a honeycomb shape. A transducer is disclosed.
[0003]
Registered Utility Model No. 2561086
[0004]
However, when the ultrasonic transducer is inserted into the hole of the frame as described
above, the holding force of the ultrasonic transducer with respect to the frame may be
insufficient, and the pressure resistance of the ultrasonic transducer may not be ensured. .
[0005]
It is also conceivable to fix the ultrasonic transducer to the frame portion via an O-ring or the
like.
However, even with this configuration, the pressure resistance may be insufficient.
[0006]
The present invention is for solving the above-mentioned subject, and the object is to improve
the pressure resistance of the ultrasonic transducer held by the frame part.
[0007]
(1) In order to solve the above problems, an ultrasonic transducer according to one aspect of the
present invention is a front portion on which a transmission / reception wavefront for
transmitting / receiving an ultrasonic wave is formed, and an end face of the front portion on the
opposite side to the transmission / reception wavefront. An ultrasonic transducer having a
piezoelectric element disposed on the front end and a rear end face of the front end, and a rear
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2
portion holding the piezoelectric element between the front end and the rear end face; one of the
rear portion and the piezoelectric element And a frame portion for supporting both, and an
elastic portion having elasticity, and the front portion is a rear end face side in the front and rear
direction which is a direction along a direction from the transmission / reception wavefront to a
rear end face of the front portion A cross-sectional area reduction portion in which a crosssectional area of a cross section perpendicular to the front-rear direction is smaller than a
portion on the transmission / reception wavefront side in the front-rear direction; It provided
between the side and the frame portion of definitive sectional area decreasing portion, which is
extendable in the longitudinal direction.
[0008]
(2) Preferably, the side surface of the cross-sectional area reducing portion is a tapered surface
which spreads in an oblique direction from the rear end face of the front portion toward the
transmission / reception wavefront.
[0009]
(3) Preferably, the ultrasonic transducer further includes a sound insulation unit disposed
between the side surface of the cross-sectional area reduction unit and the elastic unit.
[0010]
(4) Preferably, the ultrasonic transducer further includes an insulating portion which is made of
an electrically insulating material and covers the transmission / reception wavefront.
[0011]
(5) More preferably, the elastic portion and the insulating portion are integrally formed of an
insulating and elastic material.
[0012]
(6) Preferably, the ultrasonic transducer further includes a plurality of the ultrasonic transducers.
[0013]
(7) More preferably, the transmission and reception wavefronts of each of the ultrasonic
transducers are formed in a rectangular shape, and the longitudinal directions of the
transmission and reception wavefronts of each of the plurality of ultrasonic transducers are
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linear. A plurality of ultrasonic transducer rows arranged along the line are configured, and in
the plurality of ultrasonic transducer rows, the short direction of the transmission / reception
wavefront of each ultrasonic transducer is arranged along the circumferential direction .
[0014]
(8) More preferably, each of the ultrasonic transducers that constitute each of the ultrasonic
transducer rows corresponds to each of the ultrasonic transducers that constitutes an ultrasonic
transducer row that is adjacent in the circumferential direction. It is disposed offset in the
longitudinal direction of the transmission / reception wavefront.
[0015]
(9) Preferably, the ultrasonic transducer is made of an electrically insulating material and
disposed between one or both of the rear portion and the piezoelectric element and the frame
portion. And a covering member.
[0016]
(10) Preferably, the elastic portion is made of a resin material or a rubber material.
[0017]
(11) In order to solve the above problems, an underwater detection device according to an aspect
of the present invention is an underwater detection device for detecting a target in water, which
transmits or receives ultrasonic waves to or from water. An ultrasonic transducer, a signal
processing unit for processing an received signal obtained from the ultrasonic transducer to
generate an echo image, and a display for displaying the echo image generated by the signal
processing unit It has a department.
[0018]
(12) In addition, in order to solve the above problems, in the method of manufacturing an
ultrasonic transducer according to one aspect of the present invention, there is provided a front
portion on which a transmission / reception wavefront for transmitting / receiving ultrasonic
waves is formed; An ultrasonic transducer comprising: a piezoelectric element disposed on a rear
end face of a front part which is an end face on the opposite side of the front part; and a rear part
holding the piezoelectric element between the front part and the rear part In the manufacturing
method, the front portion is a portion on the rear end surface side of the front portion in the
front-rear direction which is a direction along the rear surface of the front portion from the
transmission / reception wavefront, and the transmission / reception wavefront in the front-rear
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direction And a cross-sectional area reduction portion in which the cross-sectional area of the
cross section perpendicular to the front-rear direction is reduced rather than the side portion,
and one or both of the rear portion and the piezoelectric element are supported by the frame
Comprising a step, between the side surface and the frame part of the area reduction portion in
the longitudinal direction, and providing a stretchable elastic portion to the front-rear direction
has elasticity, the.
[0019]
(13) Preferably, in the step of providing the elastic portion, the cross-sectional area reduction
portion of the ultrasonic transducer in a state in which one or both of the rear portion and the
piezoelectric element are supported by the frame portion. A material for forming the elastic
portion is filled between the side surface and the frame portion.
[0020]
According to the present invention, the pressure resistance of the ultrasonic transducer held by
the frame portion can be improved.
[0021]
It is a block diagram showing the composition of the underwater detection device concerning the
embodiment of the present invention.
It is a perspective view which shows typically the shape of the transducer shown in FIG.
FIG. 3 is a view showing a part of a developed view developed so that the outer peripheral
surface of the frame portion of the transducer shown in FIG. 2 is flat, and a plurality of vibrator
holes formed on the outer peripheral surface of the frame portion It is a figure which shows
arrangement | positioning typically.
It is the fragmentary sectional view which looked at the ultrasonic transducer | vibrator of the
state embedded in the flame | frame part and the mold part from the side.
It is a flowchart which shows the manufacturing process of a transducer.
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5
It is the figure which looked at the transducer which concerns on a modification from the radial
direction outward, Comprising: It is a figure for demonstrating the shape of the transmission /
reception wave-front of an ultrasonic transducer | vibrator.
It is the figure which looked at the transducer which concerns on a modification from the radial
direction outward, Comprising: It is a figure for demonstrating the arrangement | sequence of
several ultrasonic transducer | vibrator.
It is a figure for demonstrating the structure of the transmitter-receiver based on a modification,
Comprising: It is a figure made to respond | correspond to FIG.
It is a figure for demonstrating the structure of the transmitter-receiver based on a modification,
Comprising: It is a figure made to respond | correspond to FIG.
It is a figure for demonstrating the structure of the transmitter-receiver based on a modification,
Comprising: It is a figure made to respond | correspond to FIG.
[0022]
Hereinafter, an embodiment of an underwater detection device 1 having a transducer according
to the present invention will be described with reference to the drawings.
The underwater detection device 1 is mainly for detecting targets such as fish and fish schools,
and is fixed so as to be exposed to the sea at the bottom of a vessel such as a fishing boat.
[0023]
[Overall Configuration of Underwater Detection Device] FIG. 1 is a block diagram showing the
configuration of the underwater detection device 1 according to the embodiment of the present
invention.
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As shown in FIG. 1, the underwater detection device 1 includes a transducer 2, a transmission /
reception device 3, a signal processing unit 4, and an operation / display device 5 (display unit).
[0024]
The transducer 2 has a plurality of ultrasonic transducers 10.
In the transducer 2, each ultrasonic transducer 10 transmits the ultrasonic wave converted from
the electric signal into the water at predetermined timing, and converts the received ultrasonic
wave into an electric signal.
The configuration of the transducer 2 will be described later in detail.
[0025]
The transmission / reception device 3 includes a transmission / reception switching unit 6, a
transmission unit 7, and a reception unit 8.
During transmission, the transmission / reception switching unit 6 switches to a connection in
which a transmission signal is sent from the transmission unit 7 to the transmitter / receiver 2.
Further, at the time of reception, the transmission / reception switching unit 6 switches to a
connection in which the electric signal converted from the ultrasonic wave by the transmitter /
receiver 2 is sent from the transmitter / receiver 2 to the receiving unit 8.
[0026]
The transmitter 7 outputs a transmission signal generated based on the conditions set in the
operation / display device 5 to the transmitter / receiver 2 via the transmission / reception
switch 6.
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[0027]
The receiving unit 8 amplifies the signal received by the transmitter / receiver 2 and A / D
converts the amplified received signal.
Thereafter, the receiving unit 8 outputs the reception data converted into the digital signal to the
signal processing unit 4.
[0028]
The signal processing unit 4 processes the received data output from the receiving unit 8 to
generate a video signal of the target.
[0029]
The operation / display device 5 displays an image corresponding to the image signal output
from the signal processing unit 4 on the display screen.
The user can look at the display screen to estimate the state in the sea around the ship (such as
single fish, presence or absence of a school of fish, etc.).
In addition, the operation / display device 5 includes input means such as various input keys, and
is configured to be able to input various settings or various parameters necessary for
transmission / reception of sound waves, signal processing, or image display. ing.
[0030]
[Structure of Transducer] FIG. 2 is a perspective view schematically showing the structure of the
transducer 2. 3 is a view showing a part of a developed view in which the outer peripheral
surface 21 of the frame portion 20 of the transducer 2 shown in FIG. It is a figure which shows
typically arrangement | positioning of several hole 22 for vibrators formed in this. 4 is a partial
cross-sectional view of the ultrasonic transducer 10 embedded in the frame portion 20 and the
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mold portion 25 as viewed from the side. In the following, for convenience of explanation, in the
drawings from FIG. 2 onwards, the direction indicated by the arrow indicated by the upper side is
indicated as upper side or upper side, the direction indicated by the arrow indicated by the lower
side is indicated as lower side or lower, front side The direction indicated by the arrow may be
referred to as front or front, and the direction indicated by the arrow may be referred to as back
or back.
[0031]
The transducer 2 is formed in a substantially cylindrical shape as shown in FIG. The outer
diameter of the transducer 2 is, for example, about 530 mm. The transducer 2 is fixed to the
bottom of the ship or the like so that the center axis of the transducer 2 is exposed to the sea in
the vertical direction. As shown in FIGS. 2 and 4, the transmitter-receiver 2 includes a frame unit
20, a mold unit 25, and a plurality of ultrasonic transducers 10.
[0032]
The frame portion 20 is a substantially cylindrical member made of metal. As shown in FIGS. 3
and 4, a plurality of transducer holes 22 into which the ultrasonic transducers 10 are inserted
are formed on the outer peripheral surface 21 of the frame portion 20. Each transducer hole 22
is formed to extend radially inward of the frame portion 20 from the outer peripheral surface 21
of the frame portion 20. Further, the cross-sectional shape of the vibrator hole 22 perpendicular
to the extending direction of the vibrator hole 22 is circular.
[0033]
Referring to FIG. 3, on the outer peripheral surface 21 of the frame portion 20, vibrator hole
rows 23 linearly arranged at predetermined intervals in the vertical direction are formed at equal
intervals in the circumferential direction. ing. The plurality of transducer holes 22 are configured
by the plurality of transducer hole rows 23 arranged as described above. The plurality of vibrator
holes 22 are formed to be arranged in a straight line when viewed from radially outward in each
of the vertical direction and the circumferential direction. That is, the plurality of transducer
holes 22 are arranged in a lattice (matrix). The distance between the center points of the
transducer holes 22 adjacent in the circumferential direction is the distance at which grating
lobes described later do not occur (in the present embodiment, the half wavelength or less (0.5
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9
λ or less) of ultrasonic waves) ing.
[0034]
As shown in FIG. 4, the ultrasonic transducer 10 includes a transducer body 10 a and a covering
member 19.
[0035]
The vibrator body 10a has a front mass 11 (front portion), two piezoelectric elements 15a and
15b, and a rear mass 16 (rear portion).
The vibrator body 10a is provided as a so-called bolt-clamped Langevin vibrator (BLT vibrator) in
which the front mass 11, the piezoelectric elements 15a and 15b, and the rear mass 16 are fixed
to each other by bolting. In the vibrator main body 10a, as shown in FIG. 4, in a state in which
the rear mass 16 is fixed to the frame portion 20, from the radially inner side in the transducer 2
toward the radially outer side (back to front in FIG. 4) The rear mass 16, the piezoelectric
elements 15b and 15a, and the front mass 11 are arranged in order.
[0036]
The front mass 11 is a block-like member formed of a metal material such as aluminum, for
example, and, as shown in FIG. 4, the diameter of the transmitter 2 from the rear (inward in the
radial direction of the transmitter 2) It is provided to spread toward the direction (outward
direction). An end face on the front side of the front mass 11 is provided as a transmission /
reception wavefront 12 on which transmission / reception of ultrasonic waves is performed.
Further, the rear end face of the front mass 11 is provided as a front mass rear end face 13.
[0037]
The transmission and reception wavefront 12 is formed flat and provided forward. Further, the
transmission / reception wavefront 12 is formed in a rectangular shape elongated in the vertical
direction as viewed from the front (see FIG. 2). The length in the vertical direction of the
transmission / reception wavefront 12 is, for example, about 47 mm as an example, and the
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10
length in the width direction is, for example, about 26 mm as an example.
[0038]
The front mass 11 includes a cross-sectional area reduction portion 11 a whose cross-sectional
area decreases from the transmission / reception wavefront 12 toward the front mass rear end
surface 13. The side surface of the cross-sectional area reducing portion 11 a is provided as a
curved tapered surface 14 which is formed to extend forward from the front mass rear end
surface 13. The tapered surface 14 is provided to face the frame portion 20 in a state in which
the ultrasonic transducer 10 is fixed to the frame portion 20.
[0039]
The two piezoelectric elements 15a and 15b are formed in a substantially annular shape having
the same outer diameter and thickness, and are configured to expand and contract by an
externally applied voltage and vibrate in the axial direction. While the two piezoelectric elements
15a and 15b are coaxially stacked on each other as shown in FIG. 4, the end face on one side
(front side) is in close contact with the rear mass end face 13 on the other side, The (rear) end
face is in close contact with the front end face 17 of the rear mass 16.
[0040]
The rear mass 16 is formed in a substantially cylindrical shape having a slightly larger outer
diameter and a longer length than the piezoelectric elements 15a and 15b. The rear mass 16 is
made of, for example, a metal such as stainless steel (SUS) as an example. The rear mass 16 is
provided coaxially with the piezoelectric elements 15a and 15b, and the front end face 17 is in
close contact with the rear end face of the piezoelectric element 15b. Further, a connector 18
fixed to the frame portion 20 is connected to a rear end portion of the rear mass 16. The
connector 18 is for applying a voltage to the piezoelectric elements 15a and 15b via a cable (not
shown) connected to the piezoelectric elements 15a and 15b.
[0041]
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11
The covering member 19 is constituted by a member (for example, a sponge, a cork, etc.) having
electrical insulation and sound insulation. As shown in FIG. 4, the covering member 19 is
provided so as to cover a portion of the surface of the vibrator main body 10a excluding the
transmission / reception wavefront 12 and the rear end face of the rear mass 16. The covering
member 19 is a member formed in a band shape, and is in a state of being wound around the
vibrator main body 10 a. The portion covering the tapered surface 14 in the covering member
19 is provided as a sound insulating portion for securing the sound insulation between the
tapered surface 14 and the mold portion 25. As a result, the ultrasonic waves generated by the
ultrasonic transducer 10 can be prevented from being transmitted to the outside through the
tapered surface 14, and the ultrasonic waves can be transmitted from the transmission /
reception wavefront 12.
[0042]
The plurality of ultrasonic transducers 10 configured as described above are respectively held in
transducer holes 22 formed in the frame portion 20. Specifically, in each of the ultrasonic
transducers 10, a portion of the rear mass 16 is inserted into the transducer hole 22 such that
the long side of the transmission / reception wavefront 12 extends in the vertical direction. Since
the outer circumferential surface of the rear mass 16 is covered by the sponge-like covering
member 19, the frame portion 20 holds the rear mass 16 via the covering member 19. Moreover,
the covering member 19 is comprised by the member which has insulation as mentioned above.
Therefore, by providing the covering member 19 between the rear mass 16 and the frame
portion 20, the rear mass 16 and the frame portion 20 can be electrically insulated.
[0043]
Each ultrasonic transducer 10 is inserted and fixed to each of the plurality of transducer holes 22
as described above. As a result, in the ultrasonic transducer 10, the arrangement viewed from the
outer side in the radial direction of the transducer 2 becomes the same as the arrangement of the
plurality of transducer holes 22.
[0044]
Specifically, as shown in FIG. 2, in the plurality of ultrasonic transducers 10, the ultrasonic
transducer rows 9 linearly arranged at predetermined intervals in the vertical direction are
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equally spaced in the circumferential direction. Are arranged relative to the frame portion 20.
And each ultrasonic transducer 10 which comprises each ultrasonic transducer row 9 is arranged
in the shape of a lattice (matrix) arranged in a straight line in each of the up-and-down direction
and the circumferential direction. The distance between the center points of the ultrasonic
transducers 10 adjacent in the circumferential direction is equal to or less than half the
wavelength (0.5 λ or less) of ultrasonic waves. In this manner, the ultrasonic transducers 10 are
arranged at relatively close intervals, particularly in the circumferential direction.
[0045]
The mold part 25 is a substantially cylindrical part provided in the outer peripheral surface side
of the flame | frame part 20, as shown to FIG. 2 and FIG. The mold portion 25 is provided as an
elastic portion made of a material having elasticity and electrical insulation. Moreover, as a
material used for the mold part 25, the material close | similar to the acoustic impedance of
water (seawater) is preferable. Thereby, the ultrasonic wave from the ultrasonic transducer 10
can be efficiently transmitted to water. Examples of the material used for the mold portion 25
include stretchable materials such as urethane foam, rubber material, and epoxy resin.
[0046]
The mold portion 25 is provided so as to extend from the outer peripheral surface 21 of the
frame portion 20 to the outside of the transmitted / received wave surface 12, as shown in FIG.
Thus, the mold portion 25 is provided between the tapered surface 14 and the frame portion 20
in the front-rear direction so as to hold the tapered surface 14 from the rear side in the front-rear
direction with respect to the frame portion 20 .
[0047]
In addition, the mold unit 25 covers the transmission and reception wavefronts 12 of the
plurality of ultrasonic transducers 10. That is, the part covering the transmission / reception
wave surface 12 in the mold part 25 is provided as an insulating part having electrical insulation.
Thereby, the electrical insulation between the transmission / reception wavefront 12 and the
outside (seawater) can be secured.
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13
[0048]
[Method of Manufacturing Transducer] FIG. 5 is a flowchart showing the manufacturing process
of the transducer 2. A method of manufacturing the transducer 2 will be described with
reference to FIG.
[0049]
First, in step S1, the vibrator main body 10a is assembled. Specifically, referring to FIG. 4, in a
state in which the piezoelectric elements 15 a and 15 b stacked on each other are held between
the front mass rear end surface 13 and the front end surface 17 of the rear mass 16, bolts (not
shown) Through each other. Thereafter, in step S2, the covering member 19 is wound around the
vibrator main body 10a, whereby the ultrasonic vibrator 10 is completed.
[0050]
Next, at step S3, the ultrasonic transducer 10 is attached to the frame portion 20. Specifically, the
rear mass 16 of each ultrasonic transducer 10 is press-fit into each transducer hole 22 of the
frame portion 20. At this time, the long side of the transmission / reception wavefront 12 is
made to be along the vertical direction. In step S3, all of the plurality of ultrasonic transducers 10
are fixed to the respective transducer holes 22.
[0051]
Next, in step S4, the frame portion 20 to which all the ultrasonic transducers 10 are attached is
set in a mold (not shown). At this time, a gap having a shape corresponding to the mold portion
25 is formed between the mold and the frame portion 20 to which the ultrasonic transducer 10
is attached. Then, a urethane liquid is filled in the space and the space is foamed (step S5) to
form the mold portion 25. Then, the mold portion 25 is taken out from the mold (step S6), and
the transducer 2 is completed.
[0052]
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14
By the way, a transducer that transmits and receives ultrasonic waves to water, particularly a
transducer attached to the bottom of a ship, is a pressure (slamming pressure) at the time of
collision with a sea surface by a ship moving up and down during navigation An impact or the
like at the time of collision with a floating object acts. Therefore, the transmitter / receiver is
required to be resistant to these external forces. In this regard, when fixed to the frame portion
via an O-ring or the like as in the related art, the resistance to the external force as described
above becomes insufficient.
[0053]
On the other hand, in the transducer 2 according to the present embodiment, the side surface
(tapered surface 14) of the cross-sectional area decreasing portion 11a whose cross-sectional
area decreases from the transmission / reception wavefront 12 toward the front mass rear end
surface 13 and the frame portion 20 Between the elastic parts (mold parts 25). In this way, the
external force on the transducer 2 as described above can be absorbed by the mold unit 25
supported by the frame unit 20. Thereby, the pressure resistance of the transducer 2 can be
improved.
[0054]
[Effects] As described above, in the transducer 2 of the underwater detection device 1 according
to the present embodiment, the mold portion 25 is provided between the frame portion 20 and
the tapered surface 14 in the front-rear direction. Thereby, the external pressure and impact
force on the transducer 2 can be absorbed by the mold portion 25 supported by the frame
portion 20.
[0055]
Therefore, in the transducer 2, the pressure resistance of the ultrasonic transducer 10 held by
the frame unit 20 can be improved.
[0056]
Further, in the transducer 2, since the entire tapered surface 14 is held by the mold portion 25,
the pressure resistance of the ultrasonic transducer 10 can be further improved.
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[0057]
Further, in the transducer 2, the frame portion 20 in a state in which the rear mass 16 of the
ultrasonic transducer 10 is held is set in a mold, and a urethane liquid is filled and foamed to
form the mold portion 25.
Thereby, the mold portion 25 can be formed relatively easily.
In addition, since the mold portion 25 can be sufficiently in close contact with the tapered
surface 14 and the frame portion 20, the ultrasonic transducer 10 can be held with respect to
the frame portion 20 without rattling. And, by holding the ultrasonic transducer 10 without
rattling in this way, it is possible to prevent the positional deviation and deformation of the
ultrasonic transducer 10 with respect to the frame portion 20 caused by the external force acting
on the transducer 2. As a result, the risk that the characteristics of the ultrasonic wave
transmitted from the ultrasonic transducer 10 greatly fluctuate can be reduced.
[0058]
Further, in the transmitter / receiver 2, since the resin material, specifically, urethane foam is
used as the elastic portion, the mold portion 25 can be easily formed by molding, and the
external force acting on the ultrasonic transducer 10 Can be absorbed effectively. In addition,
even if it uses resin materials other than foaming urethane, or a rubber material as an elastic
part, the same effect can be acquired.
[0059]
Moreover, in the transducer 2, since the sound insulation part is provided between the taper
surface 14 and the mold part 25, the ultrasonic wave generated by the piezoelectric elements
15a and 15b is prevented from leaking from the taper surface 14 to the outside. it can.
Therefore, ultrasonic waves can be efficiently transmitted from the transmission / reception wave
surface 12.
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16
[0060]
Moreover, in the transmitter-receiver 2, since the transmission / reception wave surface 12 is
covered with the mold part 25 which has insulation, the insulation between the transmission /
reception wave surface 12 and the exterior (seawater) is securable.
[0061]
Further, in the transmitter-receiver 2, both the elastic portion provided between the frame
portion 20 and the tapered surface 14 and the insulating portion covering the transmission /
reception wave surface 12 are formed by the mold portion 25, so that the elastic portion The
insulation can be formed at one time.
[0062]
Moreover, in the conventional transducer, for example, the outer peripheral side of each of the
plurality of ultrasonic transducers is fixed to the frame portion via the O-ring.
In this way, when a plurality of ultrasonic transducers are fixed to the frame, a space for
attaching an O-ring between the outer portion of the ultrasonic transducers and the frame
portion is required, and thus between adjacent ultrasonic transducers. The distance gets longer.
Then, when the distance between adjacent ultrasonic transducers becomes long and becomes
half wavelength of ultrasonic waves or more, grating lobes causing a virtual image in the
underwater detection device are generated.
[0063]
On the other hand, in the transmitter-receiver 2, the mold portion 25 is provided so as to extend
in the front-rear direction from the frame portion 20 to the tapered surface 14. This eliminates
the need for a space for attaching the O-ring as in the prior art, so the distance between adjacent
ultrasonic transducers 10 can be narrowed accordingly. As a result, the distance between the
adjacent ultrasonic transducers 10 can be easily reduced to, for example, a half wavelength (0.5
λ) or less, so that the generation of grating lobes can be suppressed.
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[0064]
Further, in the transmitter / receiver 2, the shape of the transmission / reception wavefront 12 is
rectangular. Then, in the transducer 2, the ultrasonic transducers 10 are arrayed with intervals in
the circumferential direction such that the short direction of the transmission / reception
wavefront 12 follows the circumferential direction. Thereby, since the pitch between the
ultrasonic transducers 10 arranged in the circumferential direction can be shortened, generation
of grating lobes in the circumferential direction can be suppressed.
[0065]
Further, in the transducer 2, since the covering member 19 having the electrical insulation
property is provided between the rear mass 16 and the frame portion 20, the space between the
rear mass 16 and the frame portion 20 can be easily electrically made. It can be insulated.
[0066]
Further, in the transducer 2, the side surface of the cross-sectional area reducing portion 11 a is
configured by the tapered surface 14.
As a result, the cross-sectional area perpendicular to the front-rear direction of the front mass 11
can be gradually increased from the front mass rear end surface 13 toward the transmission /
reception wavefront 12, so that the band characteristics of ultrasonic waves transmitted from the
transmission / reception wavefront 12 can be secured.
[0067]
[Modifications] Although the embodiments of the present invention have been described above,
the present invention is not limited to these, and various modifications can be made without
departing from the spirit of the present invention.
[0068]
(1) FIG. 6 is a view of a transducer 2a according to a modification viewed from the outer side in
the radial direction, and is a view for explaining the shape of the transmission / reception
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wavefront 12a of the ultrasonic transducer.
In the ultrasonic transducer 10 of the above embodiment, the shape of the transmission /
reception wavefront 12 is a rectangular shape, but it is not limited to this. Specifically, as shown
in FIG. 6, the shape of the transmitted / received wave surface 12a may be circular, and further,
it may be another shape, for example, a polygonal shape such as a square shape or a hexagonal
shape, an elliptical shape, etc. May be
[0069]
(2) FIG. 7 is a view of a transducer 2b according to a modification viewed from the radial
direction, and is a view for explaining the arrangement of a plurality of ultrasonic transducers 10.
In the said embodiment, as shown in FIG. 2, although several ultrasonic transducer | vibrator 10
is arranged in the grid | lattice form, it does not restrict to this. Specifically, as shown in FIG. 7, a
plurality of ultrasonic transducers 10 constituting an ultrasonic transducer array linearly
arranged in the vertical direction are divided into ultrasonic transducer arrays adjacent in the
circumferential direction. The ultrasonic transducers 10 may be vertically displaced. As a result,
as shown in FIG. 7, the distance between the center points of the transmission / reception
wavefronts of the ultrasonic transducer 10 in which the distance is the shortest in the vertical
direction can be easily made equal to or less than half wavelength (0.5 λ or less) of ultrasonic
waves. Then, the generation of grating lobes in the vertical direction can be suppressed.
[0070]
(3) FIG. 8 is a diagram for explaining the configuration of the transducer 2c according to the
modification, and is a diagram corresponding to FIG. The present modification is different from
the above embodiment in the shape of the mold portion 25a. Moreover, the transmitter-receiver
2c which concerns on this modification has the insulating oil 26 for electrically insulating the
transmission / reception wave-front 12 of the ultrasonic transducer | vibrator 10 from the
exterior.
[0071]
As in the case of the above-described embodiment, the mold portion 25a of this modification is a
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substantially cylindrical portion made of an elastic and electrically insulating material provided
on the outer peripheral side of the frame portion 20. However, unlike the case of the abovedescribed embodiment, the mold portion 25a is provided so as to extend from the outer
peripheral surface 21 of the frame portion 20 to the transmission / reception wavefront 12 as
shown in FIG. That is, in the present modification, the transmission / reception wavefront 12 is
not covered by the mold portion 25a.
[0072]
The insulating oil 26 is filled in a casing 27 spaced apart from the mold portion 25 a and the
transmission / reception wavefront 12. Thereby, the insulation between the transmission /
reception wavefront 12 and the outside (seawater) can be secured.
[0073]
[Method of Manufacturing a Transducer] The mold 25a according to this modification can be
formed in the same manner as in the above embodiment. Specifically, the mold portion 25a is
formed by setting the frame portion 20 in a state in which the plurality of ultrasonic transducers
10 are attached to a mold, filling the urethane solution in the mold and foaming it. be able to. By
accommodating the frame portion 20 in which the mold portion 25a is thus formed and the
ultrasonic transducer 10 in the casing 27 and filling the insulating oil 26 in the casing 27, the
transmitter / receiver 2c according to the modification is obtained. Complete.
[0074]
In addition, the transducer 2c which concerns on this modification can also be manufactured by
another method. Specifically, the mold portion 25 a formed in advance is mounted on the outer
peripheral surface 21 of the frame portion 20. Thereafter, the ultrasonic transducers 10 are
inserted into and fixed to the through holes 25b formed in the mold portion 25a and the vibrator
holes 22 of the frame portion 20, and the ultrasonic transducers 10 are accommodated in the
casing 27 and then filled with the insulating oil 26. Do. Also in this case, a transmitter-receiver
having the same configuration as that described above can be manufactured.
[0075]
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(4) FIG. 9 is a view for explaining the configuration of the transducer 2d according to the
modification, and is a view corresponding to FIG. In the above-mentioned embodiment, although
frame part 20 supports a portion of rear mass 16 in ultrasonic transducer 10, not only this but
as shown in Drawing 9, frame part 20a, rear mass 16, and piezoelectric element 15a , 15b may
be supported. Furthermore, not only this but only the piezoelectric elements 15a and 15b may be
supported. Thereby, in the present modification, the mold portion 25c is formed to extend
forward (outward in the radial direction of the transducer 2d) from the vicinity of the front mass
rear end surface 13 in the front-rear direction.
[0076]
(5) FIG. 10 is a diagram for explaining the configuration of the transducer 2e according to the
modification, and is a diagram corresponding to FIG. In the above embodiment, although both the
elastic portion and the insulating portion covering the transmission / reception wave face 12 are
configured by the mold portion 25, the present invention is not limited to this. Specifically, as
shown in FIG. 10, an elastic portion 28 is provided between the tapered surface 14 and the frame
portion 20 in the front-rear direction, and the area covering the transmission / reception
wavefront 12 is made of a material different from the elastic portion 28. The insulating portion
29 may be provided.
[0077]
(6) In the above embodiment, the transducer 2 is described as an example applied to the
underwater detection device 1 for detecting a target in water, but the present invention is not
limited to this, and other devices having a transducer ( The present invention can also be applied
to ultrasonic diagnostic apparatuses and the like.
[0078]
(7) In the above embodiment, although the transducer 2 having a plurality of ultrasonic
transducers 10 is described, the present invention is not limited to this, and the present invention
is applied to a transducer having one ultrasonic transducer. You can also
[0079]
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(8) In the above embodiment, the ultrasonic transducers 10 are arranged such that the long side
of the transmission / reception wave front 12 formed in a rectangular shape is along the vertical
direction and the short side is along the circumferential direction. It is not limited to this.
Specifically, the ultrasonic transducers 10 may be arranged such that the short side of the
transmission / reception wave front 12 extends in the vertical direction and the long side extends
in the circumferential direction.
In this case, a plurality of ultrasonic transducer arrays, in which the short sides of the
transmission / reception wavefronts 12 are linearly arranged in the vertical direction, are
arranged along the circumferential direction.
[0080]
(9) In the above embodiment, the side surface of the cross-sectional area reducing portion 11a of
the ultrasonic transducer 10 is a tapered surface 14 that spreads in an oblique direction from the
front mass rear end surface 13 toward the transmitting / receiving wavefront 12 The side
surface is a side surface (that is, a surface provided substantially parallel to the outer peripheral
surface 21 of the frame portion 20) along a direction substantially perpendicular to the frontrear direction which is a direction from the transmission / reception wavefront 12 to the front
mass rear end surface 13. May be
[0081]
INDUSTRIAL APPLICABILITY The present invention can be widely applied as an ultrasonic
transducer that transmits and receives ultrasonic waves, an underwater detection device
equipped with an ultrasonic transducer, and a method of manufacturing an ultrasonic transducer.
[0082]
Reference Signs List 1 underwater detection device 2, 2a, 2b, 2c, 2d transducer (ultrasonic
transducer) 10 ultrasonic transducer 11 front mass (front portion) 12, 12a transmission /
reception wavefront 13 front mass rear end surface (front portion) Rear end surface) 14 Tapered
surface (side surface of cross-sectional area reduced portion) 15a, 15b Piezoelectric element 16
Rear mass (rear portion) 20, 20a Frame portion 25, 25a, 25c Mold portion (elastic portion) 28
Elastic portion
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