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DESCRIPTION JP2003135464

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DESCRIPTION JP2003135464
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transmitting and receiving apparatus for ultrasonic internal observation used in the
medical field and various industrial fields.
[0002]
2. Description of the Related Art In the medical field and various industrial fields, internal
observation of ultrasonic waves using an ultrasonic wave transmitting / receiving apparatus is
actively performed. In general, an ultrasonic transmitting and receiving apparatus for ultrasonic
internal observation transmits an ultrasonic wave to an object to be measured (for example, a
human body) and has an electric ultrasonic transducer for receiving an ultrasonic wave reflected
in the object to be measured. The signal processing apparatus comprises a sound wave probe and
an electric signal transceiver for supplying an electric signal to the electric ultrasonic transducer
and receiving an electronic signal converted by the electric ultrasonic transducer. Generally, an
array-type piezoelectric vibrator in which a plurality of piezoelectric vibrators are arranged in
parallel is used as an electric ultrasonic transducer of an ultrasonic transmitting and receiving
apparatus for ultrasonic internal observation.
[0003]
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1
In the ultrasonic transmitting and receiving apparatus using the array type piezoelectric vibrator,
in order to perform ultrasonic internal observation with high sensitivity, it is desirable that the
electric signal propagation efficiency between each piezoelectric vibrator and the electric signal
transmitter-receiver be high. However, the electrical impedance (usually 200 to 300 ohms)
between the upper and lower electrodes of the piezoelectric vibrator and the electrical
impedance (usually 50 to 75 ohms) of the electrical wiring connecting the piezoelectric vibrator
and the electrical signal transceiver Generally, the difference between the above and the above
tends to be large, so that reflection loss of an electrical signal is likely to occur between the
piezoelectric vibrator and the electrical wiring. Therefore, conventionally, a coil (matching coil) is
inserted into the electrical wiring connecting the piezoelectric vibrator and the electrical signal
transmitter-receiver, the electrical impedance is increased, and the electrical impedance between
the upper and lower electrodes of the piezoelectric vibrator is increased. The difference between
the two is being made smaller.
[0004]
Hereinafter, with reference to FIGS. 1 and 2 of the accompanying drawings, description will be
made of a typical ultrasonic transmitting and receiving apparatus according to the related art, in
which a coil is inserted in electrical wiring connecting the piezoelectric vibrator and the electrical
signal transceiver. FIG. 1 is an electrical wiring diagram of a conventional typical ultrasonic
transmitting and receiving apparatus. FIG. 2 is a schematic perspective view of an ultrasonic
probe used in the ultrasonic transmitting and receiving apparatus of FIG.
[0005]
In FIG. 1, the ultrasonic transmitting and receiving apparatus includes an ultrasonic probe 10, a
probe cable 11, and a signal processing apparatus 12. The ultrasonic probe 10 is composed of an
array type piezoelectric vibrator 13 and a flexible printed circuit board 14. As shown in FIG. 2,
the array type piezoelectric vibrator 13 is configured by arranging five piezoelectric vibrators 16
a to 16 e in parallel in a one-dimensional direction on the sound absorbing material 15. The
piezoelectric vibrator 16a is made of a piezoelectric material 18 provided with electrodes 17a
and 17b at the top and bottom. Similarly, the other piezoelectric vibrators 16b to 16e are also
made of a piezoelectric material provided with electrodes on the upper and lower sides. The
upper electrodes of the piezoelectric vibrators 16a to 16e are electrically connected by a ground
plate 19 made of metal foil such as copper foil.
10-04-2019
2
[0006]
The flexible printed circuit board 14 is connected to the lower surface electrodes of the
piezoelectric vibrators 16a to 16e for electrical signals and for grounding via the ground plate 19
to the upper electrodes of the piezoelectric vibrators 16a to 16e. A printed wiring 21 is provided.
The probe cable 11 has coaxial cables 22a to 22e for electric signal connected to the printed
wiring 20a to 20e for electric signal, and a coaxial cable 23 for grounding connected to the
printed wiring 21 for grounding. The signal processing device 12 has an electric signal
transceiver 24 connected to the electric signal coaxial cables 22a to 22e, and an earth wire 25
connected to the earth coaxial cable 23.
[0007]
Coils 26a to 26e having the same inductance are inserted in the printed wiring 20a to 20e for
electric signal. The coil 26a increases the electrical impedance of the electrical wiring (printed
wiring 20a for electrical signal and coaxial cable 22a for electrical signal) connecting the
piezoelectric vibrator 16a and the electrical signal transceiver 25 so that the upper and lower
electrodes of the piezoelectric vibrator 16a Function to reduce the difference between the
electrical impedance and The coils 26b to 26e also have the same function.
[0008]
In the known ultrasonic transmitting and receiving apparatus, an acoustic matching layer and an
acoustic lens may be attached on the upper electrodes of the piezoelectric transducers 16a to
16e, but they are not directly related to the present invention. , The description is omitted.
Further, the signal processing device 12 may be provided with an image processing device that
performs image processing of an electric signal, and a monitor that displays the obtained image
signal, but this is omitted for the same reason.
[0009]
When ultrasonic ultrasonic observation is performed by a sector scanning method using an
ultrasonic transducer using an array-type piezoelectric transducer, a piezoelectric transducer
(16a in FIG. 1) is located at the end of the array-type piezoelectric transducer in the parallel
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3
direction. , 16e) may be detected as noise. For this reason, conventionally, weighting
(apodization) has been performed on ultrasonic signals transmitted from a piezoelectric vibrator
so that an ultrasonic signal that causes noise from the array-type piezoelectric vibrator is not
transmitted.
[0010]
As a method of weighting an ultrasonic signal, a piezoelectric vibrator in which the transmission
timing of the electric signal transmitted to each piezoelectric vibrator of the array type
piezoelectric vibrator is positioned at the center of the array type piezoelectric vibrator in the
parallel direction (FIG. There is known a method of delaying from the point 16c) to a
piezoelectric vibrator (16a, 16e in FIG. 1) located at the end thereof in the form of a quadratic
function. However, this method requires a delay circuit for delaying the transmission timing of
the electrical signal.
[0011]
As another method, it is known that the area of the upper and lower electrodes of the
piezoelectric vibrator is decreased from the piezoelectric vibrator located at the center in the
parallel direction toward the piezoelectric vibrator located at the end thereof. . However, in this
method, it is difficult to industrially manufacture an array-type piezoelectric vibrator in which
piezoelectric vibrators having different electrode areas are arranged in parallel.
[0012]
SUMMARY OF THE INVENTION An object of the present invention is to use an array-type
piezoelectric vibrator which is easily manufactured industrially, and in particular, an ultrasonic
signal transmitted from the array-type piezoelectric vibrator without providing a delay circuit. It
is an object of the present invention to provide an ultrasonic transmitting and receiving
apparatus which is weighted to enable highly sensitive ultrasonic internal observation.
[0013]
SUMMARY OF THE INVENTION The inventor of the present invention increases the electrical
signal propagation efficiency of a piezoelectric vibrator located at the center in the parallel
direction of an array type piezoelectric vibrator and an electrical signal transceiver, and is located
at the end thereof. The ultrasonic signal transmitted from the piezoelectric vibrator can be
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weighted by lowering the electric signal propagation efficiency of the piezoelectric vibrator and
the electric signal transceiver, that is, weighting the electric signal supplied to the piezoelectric
vibrator. I found it.
[0014]
According to the present invention, an array-type piezoelectric vibrator in which a plurality of
piezoelectric vibrators made of a piezoelectric material having electrodes at the top and bottom
are arranged in parallel, and a ground wire connected to one electrode of each piezoelectric
vibrator and the other An ultrasonic transmitting and receiving apparatus comprising a signal
processing apparatus including an electric signal transmitting / receiving device connected to an
electrode, wherein an electrical connection between upper and lower electrodes of the
piezoelectric vibrator located at the center in the parallel direction of the array type piezoelectric
vibrator The difference between the impedance and the electrical impedance of the electrical
wiring connecting the piezoelectric vibrator and the electrical signal transceiver is the electrical
connection between the upper and lower electrodes of the piezoelectric vibrator located at the
end of the array type piezoelectric vibrator in the parallel direction An ultrasonic transmitting
and receiving apparatus is characterized in that it is smaller than the difference between the
impedance and the electrical impedance of the electrical wiring connecting the piezoelectric
vibrator and the electrical signal transceiver.
[0015]
In the present invention, the piezoelectric vibrator positioned at the center in the parallel
direction of the array-type piezoelectric vibrators is a single piezoelectric vibration positioned at
the center in the parallel direction of the array-type piezoelectric vibrator when the number of
piezoelectric vibrators is odd. When the number of piezoelectric vibrators is an even number, it
means two piezoelectric vibrators located at the center in the parallel direction.
[0016]
The preferred embodiments of the ultrasonic transmitting and receiving apparatus of the present
invention are as follows.
(1) From the end of the array type piezoelectric vibrator in the parallel direction toward the
center, the electrical impedance between the upper and lower electrodes of the piezoelectric
vibrator, and the electrical wiring connecting the piezoelectric vibrator and the electrical signal
transceiver The difference with the impedance is made to decrease.
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(2) The electrical impedance of the electrical wiring connecting the piezoelectric vibrator and the
electrical signal transceiver is adjusted by the coil inserted in the electrical wiring.
[0017]
The present invention also provides an array-type piezoelectric vibrator formed by arranging in
parallel a plurality of piezoelectric vibrators made of piezoelectric material having electrodes at
the top and bottom in parallel, and a ground wire and the other connected to one electrode of
each piezoelectric vibrator. An ultrasonic probe composed of electrical wiring connected to the
electrodes of the piezoelectric transducer, wherein the electrical impedance between the upper
and lower electrodes of the piezoelectric vibrator located at the center in the parallel direction of
the array type piezoelectric vibrator and the piezoelectric vibrator are connected The electrical
impedance between the upper and lower electrodes of the piezoelectric vibrator located at the
end of the array type piezoelectric vibrator in the parallel direction and the electrical impedance
of the electrical wiring connected to the piezoelectric vibrator There is also an ultrasonic probe
characterized by being smaller than the difference from the impedance.
[0018]
Furthermore, according to the present invention, an array-type piezoelectric vibrator in which a
plurality of piezoelectric vibrators made of a piezoelectric material having electrodes at the top
and bottom are arranged in parallel in a two-dimensional direction, and one electrode of each
piezoelectric vibrator is connected An ultrasonic transmitting and receiving apparatus
comprising a signal processing apparatus comprising a ground wire to be connected and an
electric signal transmitter / receiver connected to the other electrode, wherein the piezoelectric is
located at the center of at least one parallel direction of the array type piezoelectric vibrator A
piezoelectric element in which the difference between the electrical impedance between the
upper and lower electrodes of the vibrator and the electrical impedance of the electrical wiring
connecting the piezoelectric vibrator and the electrical signal transceiver is at the end of the
array type piezoelectric vibrator in the parallel direction Ultrasonic transmission characterized in
that it is smaller than the difference between the electrical impedance between the upper and
lower electrodes of the vibrator and the electrical impedance of the electrical wiring connecting
the piezoelectric vibrator and the electrical signal transceiver. There is also the communication
apparatus.
[0019]
The present invention further provides an array-type piezoelectric vibrator in which a plurality of
piezoelectric vibrators made of a piezoelectric material having electrodes at the top and bottom
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are arranged in parallel in a two-dimensional direction, and an earth connected to one electrode
of the piezoelectric vibrator. An ultrasonic probe comprising an electrical wiring connected to a
wire and the other electrode, wherein the electrical impedance between the upper and lower
electrodes of the piezoelectric vibrator positioned at the center of at least one parallel direction
of the array type piezoelectric vibrator; The difference between the electrical impedance of the
electrical wiring connected to the piezoelectric vibrator and the electrical impedance between the
upper and lower electrodes of the piezoelectric vibrator located at the end of the array type
piezoelectric vibrator in the parallel direction and the piezoelectric vibrator There is also an
ultrasonic probe characterized in that it is smaller than the difference in electrical impedance of
the electrical wiring.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION An ultrasonic transmitting and receiving
apparatus and an ultrasonic probe according to the present invention will be described with
reference to the attached drawings.
[0021]
FIG. 3 is an electrical wiring diagram of an example of an ultrasonic transmitting and receiving
apparatus according to the present invention.
FIG. 4 is a schematic perspective view of an ultrasonic probe used in the ultrasonic transmitting
and receiving apparatus of FIG.
In FIG. 3, the ultrasonic transmitting and receiving apparatus includes an ultrasonic probe 30, a
probe cable 31, and a signal processing apparatus 32.
The ultrasonic probe 30 is composed of an array type piezoelectric vibrator 33 and a flexible
printed board 34.
[0022]
As shown in FIG. 4, the array-type piezoelectric vibrator 33 is configured by arranging five
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piezoelectric vibrators 36 a to 36 e in parallel in a one-dimensional direction on the sound
absorbing material 35.
The piezoelectric vibrator 36a is made of a piezoelectric material 38 (for example, piezoelectric
ceramics such as lead zirconate titanate (PZT)) provided with electrodes 37a and 37b at the top
and bottom.
Similarly, the other piezoelectric vibrators 36b to 36e are also made of a piezoelectric material
provided with electrodes at the top and bottom.
The upper electrodes of the piezoelectric vibrators 36a to 36e are electrically connected by a
ground plate 39 made of metal foil such as copper foil.
[0023]
For the flexible printed circuit board 34, electrical signal printed wiring 40a to 40e connected to
the lower electrodes of the piezoelectric vibrators 36a to 36e, and an earth plate connected to
the upper electrodes of the piezoelectric vibrators 36a to 36e via the ground plate 39 A printed
wiring 41 is provided. The probe cable 31 has electrical signal coaxial cables 42 a to 42 e
connected to the electrical signal printed wiring 40 a to 40 e and a grounding coaxial cable 43
connected to the ground printed wiring 41. The signal processing device 32 has electric signal
transceivers 44 connected to the electric signal coaxial cables 42 a to 42 e and an earth wire 45
connected to the earth coaxial cable 43.
[0024]
Coils 46a to 46e are inserted in the electric signal printed wiring 40a to 40e. The coil 46a and
the coil 46e, and the coil 46b and the coil 46d respectively have the same inductance. The
inductances of the coils 46a to 46e are larger in the order of the coils 46a and 46e, the coils 46b
and 46d, and the coil 46c (note that in FIGS. 3 and 4, the longer the coil length, the larger the
inductance of the coil Represents that. Hereinafter, the same applies to FIGS.
[0025]
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For this reason, the electrical impedance of the electrical wiring connecting the piezoelectric
vibrators 36a to 36e and the electrical signal transceiver 44 is the most electrical wiring of the
piezoelectric vibrator 36c (the printed wiring 40c for the electrical signal and the coaxial cable
42c for the electrical signal) Get higher. The next highest is the electrical wiring of the
piezoelectric vibrator 36b (the electrical signal printed wiring 40b and the electrical signal
coaxial cable 42b), and the electrical wiring of the piezoelectric vibrator 36d (the electrical signal
printed wiring 40d and the electrical signal coaxial cable 42d) ). The smallest one is the electrical
wiring of the piezoelectric vibrator 36a (the electrical signal printed wiring 40a and the electrical
signal coaxial cable 42a) and the electrical wiring of the piezoelectric vibrator 36e (the electrical
signal printed wiring 40e and the electrical signal coaxial cable 42e). That is, the difference
between the electrical impedance between the upper and lower electrodes of the piezoelectric
vibrators 36a to 36e and the electrical impedance of the electrical wiring connecting the
piezoelectric vibrators 36a to 36e and the electrical signal transceiver 44 is the piezoelectric
vibrator 36a and the piezoelectric vibration The element 36e, the piezoelectric vibrator 36b, the
piezoelectric vibrator 36d, and the piezoelectric vibrator 36c become smaller in this order.
[0026]
In the ultrasonic transmitting and receiving apparatus shown in FIG. 3, although the coil is
inserted in each of the printed wiring for electric signal of the flexible printed board, the
piezoelectric vibrator located at the end of the array type piezoelectric vibrator in the parallel
direction The coil may not necessarily be inserted into the printed wiring for electrical signal
connected to the lower electrode. An electrical wiring diagram of an example of the ultrasonic
transmitting and receiving apparatus having such a configuration is shown in FIG.
[0027]
In FIG. 5, the ultrasonic transmitting and receiving apparatus comprises an ultrasonic probe 50, a
probe cable 31, and a signal processing apparatus 32. Except for the ultrasonic probe 50, the
same configuration as the ultrasonic transmitting and receiving apparatus shown in FIG. It has
become. The ultrasonic probe 50 has the same configuration as the ultrasonic probe 30 shown in
FIG. 3 except that a coil is not inserted into the electric signal printed wiring 40 a and 40 e of the
flexible printed circuit 54. By not inserting a coil in the electric signal printed wiring 40a, 40e,
the electric impedance between the upper and lower electrodes of the piezoelectric vibrators
36a, 36e and the electric wiring connecting the piezoelectric vibrators 36a, 36e and the electric
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signal transceiver 44 The difference is larger than when the coil is inserted. For this reason,
compared with the case where the coil is inserted, the propagation efficiency of the electrical
signal of the piezoelectric vibrators 36 a and 36 e and the electrical signal transceiver 44 can be
adjusted to be lower.
[0028]
In the ultrasonic transmitting and receiving apparatus shown in FIG. 3, the coil is inserted into
the printed wiring for electric signal of the flexible printed circuit board, but the installation
position of the coil is not limited to this. For example, the coil may be inserted into the electrical
signal coaxial cable, or may be inserted between the electrical signal coaxial cable and the signal
processing device. An electrical wiring diagram of an example of an ultrasonic transmitting and
receiving apparatus in which a coil is inserted in addition to the flexible printed circuit board is
shown in FIGS. 6 and 7.
[0029]
In FIG. 6, the ultrasonic transmitting and receiving apparatus includes an ultrasonic probe 60, a
probe cable 31, a circuit box 61, and a signal processing apparatus 32. The circuit box 61 is
disposed between the probe cable 31 and the signal processing device 32. The circuit box 61
includes coils 46a 'to 46e' connected to the electrical signal coaxial cables 42a to 42e. The coils
46a 'and 46e' and the coils 46b 'and 46d' have the same inductance. The inductances of the coils
46a 'to 46e' increase in the order of the coils 46a 'and 46e', the coils 46b 'and 46d', and the coil
46c '. The ultrasonic probe 60 has the same configuration as the ultrasonic probe 30 shown in
FIG. 3 except that a coil is not inserted into the electric signal printed wiring 40 a to 40 e of the
flexible printed circuit 64. By not inserting a coil in the electrical signal printed wiring 40 a to 40
e of the flexible printed circuit board 64, the shape of the ultrasonic probe 60 can be reduced.
[0030]
In FIG. 7, the ultrasonic transmitting and receiving apparatus includes an ultrasonic probe 30, a
probe cable 31, a circuit box 61, and a signal processing apparatus 32. The electrical impedance
of the electrical wiring connecting the piezoelectric vibrators 36a to 36e and the electrical signal
transceiver 44 is the coils 46a to 46e of the printed wiring for the electrical signal of the flexible
printed circuit 34 and the coils 46a 'to 46e' of the circuit box 61. And are adjusted by. Therefore,
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the electrical impedance of the electrical wiring connecting the piezoelectric vibrators 36 a to 36
e and the electrical signal transceiver 44 can be changed more largely.
[0031]
In FIGS. 3 to 7, the array-type piezoelectric vibrator is composed of five piezoelectric vibrators,
but the number of arrayed piezoelectric vibrators of the array-type piezoelectric vibrator is not
particularly limited. The number of piezoelectric vibrators of the array-type piezoelectric vibrator
is generally in the range of 5 to 200. When the number of arranged piezoelectric vibrators
exceeds five, the electrical impedance of the electrical wiring connecting the piezoelectric
vibrators and the electric signal transceiver may be adjusted for each of the piezoelectric
vibrators, or a plurality of piezoelectric vibrators may be used. The transducers (usually 2 to 10)
may be adjusted as a set for each set.
[0032]
In FIGS. 3 to 7, the array type piezoelectric vibrator in which the piezoelectric vibrators are
arranged in parallel in one dimension direction has been described, but in the present invention,
a two-dimensional array type in which the piezoelectric vibrators are arranged in parallel in two
dimensions It may be a piezoelectric vibrator. Hereinafter, an example of an ultrasonic
transmitting and receiving apparatus using a two-dimensional array type piezoelectric vibrator
will be described with reference to FIG. 8 and FIG.
[0033]
FIG. 8 is an electrical wiring diagram of an example of an ultrasonic transmitting and receiving
apparatus according to the present invention. In FIG. 8, the ultrasonic transmitting and receiving
apparatus comprises an ultrasonic probe 80, a probe cable 81, and a signal processing apparatus
82.
[0034]
The ultrasonic probe 80 is composed of a two-dimensional array type piezoelectric vibrator 83
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and a flexible printed board 84. The two-dimensional array type piezoelectric vibrator 83 is
configured by arranging five piezoelectric vibrators 86 in the longitudinal direction and three
piezoelectric vibrators 86 in the lateral direction in parallel. The piezoelectric vibrator 86 is made
of a piezoelectric material 88 provided with electrodes 87a and 87b at the top and bottom.
[0035]
The flexible printed circuit 84 is provided with a printed wiring 90 for electrical signals
connected to the lower electrode of the piezoelectric vibrator 86 and a printed wiring 91 for
grounding connected to the lower electrode of the piezoelectric vibrator 86. The probe cable 81
has an electrical signal coaxial cable 92 connected to the electrical signal printed wiring 90 and a
grounding coaxial cable 93 connected to the grounding printed wiring 91. The signal processing
device 82 has an electric signal transceiver 94 connected to the electric signal coaxial cable 92
and an earth wire 95 connected to the earth coaxial cable 93.
[0036]
A coil 96 is inserted in each of the electrical signal printed wiring lines 90. In the coils 96a1 to
96a3 of the electrical signal printed wiring 90a1 to 90a3 connected to the piezoelectric vibrators
86a1 to 86a3 arranged in parallel in the lateral direction of the two-dimensional array type
piezoelectric vibrator 83, the inductances of the coil 96a1 and the coil 96a3 are the same, The
inductance of the coil 90a2 is larger than the inductance of the coils 96a1 and 96a3. On the
other hand, the coils 96a1 to 96e1 of the electrical signal printed wiring 90a1 to 90e1 connected
to the piezoelectric vibrators 86a1 to 86e1 arranged in parallel in the vertical direction of the
two-dimensional array type piezoelectric vibrator 83 have the same inductance. That is, the
piezoelectric vibrators arranged in parallel in the lateral direction of the two-dimensional array
type piezoelectric vibrator 83 are weighted.
[0037]
FIG. 9 is an electrical wiring diagram of another example of the ultrasonic transmitting and
receiving apparatus. In FIG. 9, the ultrasonic transmitting and receiving apparatus comprises an
ultrasonic probe 100, a probe cable 81, and a signal processing apparatus 82. Except for the
ultrasonic probe 100, the same configuration as the ultrasonic transmitting and receiving
apparatus shown in FIG. It has become. The ultrasonic probe 100 has the same configuration as
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the ultrasonic probe 80 shown in FIG. 8 except that a coil 96 'is inserted in the electric signal
printed wiring 90 of the flexible printed board 104.
[0038]
The coils 96a1 'to 96a3' of the electric signal printed wiring 90a1 to 90a3 connected to the
piezoelectric vibrators 86a1 to 86a3 arranged in parallel in the lateral direction of the twodimensional array type piezoelectric vibrator 83 have inductances of the coil 96a1 'and the coil
96a3' The same is true, and the inductance of the coil 96a2 'is larger than the inductance of the
coils 96a1', 96a3 '. On the other hand, the coils 96a1 'to 96a3' of the electric signal printed
wiring 90a1 to 90e1 connected to the piezoelectric vibrators 86a1 to 86e1 arranged in parallel
in the vertical direction of the two-dimensional array type piezoelectric vibrator 83 are a coil
96a1 'and a coil 96e1', The coil 96b1 'and the coil 96d1' respectively have the same inductance,
but the inductance is larger in the order of the coil 96a1 'and the coil 96e1', the coil 96b1 'and
the coil 96d1', and the coil 96c1 '. That is, the piezoelectric vibrators arranged in parallel in the
vertical and horizontal directions of the two-dimensional array piezoelectric vibrator 83 are
weighted.
[0039]
In FIGS. 8 and 9, the two-dimensional array type piezoelectric vibrator is configured such that
five piezoelectric vibrators 86 are arranged in parallel in the longitudinal direction and three
piezoelectric vibrators 86 in the lateral direction. The number is not particularly limited. The
number of piezoelectric vibrators of the two-dimensional array type piezoelectric vibrator is
generally in the range of 5 to 200 in the longitudinal direction. In the lateral direction, it is
generally in the range of 3 to 200. When the number of arranged piezoelectric vibrators exceeds
five, the electrical impedance of the electrical wiring connecting the piezoelectric vibrators and
the electric signal transceiver may be adjusted for each of the piezoelectric vibrators, or a
plurality of piezoelectric vibrators may be used. The transducers (usually 2 to 10) may be
adjusted as a set for each set.
[0040]
In the ultrasonic transmitting and receiving apparatus described above, the coil is used to adjust
the electrical impedance of the electrical wiring connecting the piezoelectric vibrator and the
electrical signal transceiver, but instead of using the coil, the material of the electrical wiring is
changed It is also possible to adjust its electrical impedance.
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[0041]
In the present invention, the shape of the piezoelectric vibrator is not particularly limited, and
various shapes can be used.
For example, the piezoelectric vibrator may have a plate shape, or the upper electrode may have
a concave shape.
[0042]
According to the ultrasonic transmitting and receiving apparatus of the present invention, only
the necessary ultrasonic signals can be obtained by lowering the detection sensitivity of the side
lobe that causes noise. Therefore, by using the ultrasonic transmitting and receiving apparatus of
the present invention, ultrasonic internal observation with high accuracy can be performed.
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