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DESCRIPTION JP2010042042

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DESCRIPTION JP2010042042
An ultrasonic diagnostic apparatus in which an ultrasonic probe including an ultrasonic
transducer is connected to a main device via a cable is provided to cope with an increase in the
number of piezoelectric elements. An ultrasonic probe 2 A / D converts a received signal of an
ultrasonic wave by an analog / digital converter 28 and obtains a plurality of digital signals of a
plurality of channels and a plurality of bits obtained by a parallel / serial converter 29. After the
/ S conversion, the electro-optical conversion element 30 converts the light signal into an optical
signal and transmits the optical signal through the optical fiber 52. In the main unit 3, the light
signal is converted into an electric signal by the photoelectric conversion element 31, converted
into parallel by the S / P converter 32, and then the normal processing after the beam former
circuit 33 is performed. Therefore, by using serial communication, it is possible to reduce the
number of wires, prevent the wire connection from becoming complicated, thin the cable 5 to
ensure flexibility, and improve the procedure operability. In addition, since the optical fiber 52 is
used only for the reception signal, the strength of the cable 5 can be prevented from decreasing.
[Selected figure] Figure 4
Ultrasonic diagnostic equipment
[0001]
The present invention relates to an ultrasonic diagnostic apparatus, and more particularly to an
ultrasonic diagnostic apparatus in which a main unit and an ultrasonic probe are connected via a
cable, and a large number of piezoelectric elements are arranged in an ultrasonic transducer.
[0002]
14-04-2019
1
An ultrasonic diagnostic apparatus is a medical imaging device which non-invasively obtains a
tomogram of soft tissue in a living body from a body surface by an ultrasonic pulse reflection
method.
This ultrasound diagnostic apparatus is smaller and cheaper than other medical imaging devices,
and it has high safety because it does not receive X-rays, etc., so it has cardiovascular (heart
coronary), digestive (gastrointestinal), It is widely used in internal medicine (liver, pancreas,
spleen), urology (kidney, bladder), and obstetrics and gynecology. In particular, in breast
diagnosis in recent years, ultrasound diagnosis has become highly diagnostic of masses and
tumors, and has become a major contribution to the discovery of breast cancer, and its
importance has been increasingly recognized.
[0003]
The ultrasonic probe used in such a medical ultrasonic diagnostic apparatus generally utilizes the
piezoelectric effect of a piezoelectric ceramic in order to transmit and receive ultrasonic waves
with high sensitivity and high resolution. In this case, as a vibration mode of the transmitting
piezoelectric vibrator (piezoelectric element), a single type probe which is a single piezoelectric
vibrator or an array type probe in which a plurality of piezoelectric vibrators are onedimensionally or two-dimensionally arranged is often used. . Two-dimensionally arrayed arrays
are widely used for medical ultrasound diagnosis because they can obtain fine images. However,
in an ultrasound probe in which piezoelectric transducers are arranged in one dimension, the
number of elements is, for example, about 128, and in the arithmetic processing for driving the
ultrasound probe, about 128 piezoelectric transducers. In the two-dimensional array ultrasonic
probe in which the piezoelectric transducers are arranged in the two-dimensional array, for
example, the number of elements in the case where the transducers are arranged in 64 × 64 is
4096 elements. In 128 × 128, it reaches 16384 pieces. Therefore, the arithmetic processing for
driving the two-dimensional array ultrasound probe drives as many as 4096 to 16384
transducers, and the processing of the received signal obtained therefrom is also added, resulting
in a heavy load of arithmetic processing. To increase.
[0004]
Moreover, in order to vibrate by applying a voltage (pulses of individual delay time) for obtaining
a desired beam profile to each piezoelectric vibrator, the number of signal lines is increased
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accordingly, and from the ultrasonic probe to the main unit There is a problem that the wiring of
signal wiring becomes very complicated. In addition, the thickness of the coaxial cable formed by
bundling the signal wiring becomes large, cable routing is difficult, and the operability of the
ultrasonic probe is inferior, and the capacity of the coaxial cable is large. Is a problem.
[0005]
On the other hand, digital signal processing technology has progressed, and small arithmetic
processing chips have been developed to carry out digital arithmetic processing within the
ultrasonic probe rather than digital processing within the main unit of the ultrasonic diagnostic
apparatus. By transmitting a signal from which noise has been removed, it is possible to avoid
mixing of noise in the coaxial cable communication described above. Therefore, in the ultrasound
diagnostic apparatus that converts received signals of ultrasonic waves generated in the living
body from analog signals to digital signals in the ultrasound probe and transmits the signals to
the main unit for processing, the received signals are converted to digital data. Generally, an
analog / digital converter for parallel output is used because the signal extraction speed is high.
Therefore, the number of signal lines between the ultrasonic probe and the main unit is
proportional to the product of the number of reception channels of the ultrasonic probe and the
number of output signals (bits) of the analog / digital converter. As the number of reception
channels (number of elements) and the number of bits of the analog / digital converter increase,
the number of digital signal lines increases.
[0006]
As described above, in the ultrasound diagnostic apparatus, the number of output bits of the
analog / digital converter and the number of reception channels of the apparatus tend to
increase in order to improve the image quality and enable three-dimensional imaging and the
like. In other words, in the circuits following the analog-to-digital converter, signal lines for
transmitting received data tend to increase. This causes problems such as the complexity of
board design, the increase in the number of pins of the inter-board connector, and the increase in
raw materials and manufacturing costs accompanying the increase in the number of wires in the
coaxial cable. Therefore, Patent Document 1 proposes a technique for converting a parallel signal
into a serial signal and transmitting it. JP 2003-10187 A
[0007]
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However, the power of the transmission signal is large, even for digital signals, against weak
reception signals, particularly harmonic signal components effective for the above-mentioned
image quality improvement, three-dimensional imaging, etc. (crosstalk Etc.). Therefore, a power
(power supply) line is separately provided, and both transmission and reception use optical
fibers, and the transmission signal actually given to the piezoelectric vibrator is also transmitted
as an optical signal from the main unit and converted into an electrical signal in the ultrasonic
probe. It is conceivable to avoid the influence of the aforementioned crosstalk and the like.
[0008]
However, the optical fiber is fragile and may be broken. In particular, when the refractive index is
increased to prevent light leakage (to improve the efficiency), the film becomes hard and the
tendency becomes strong.
[0009]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an ultrasonic
diagnostic apparatus in which a transmission signal does not affect a reception signal with
respect to an increase in the number of elements of a piezoelectric element, and a required
strength can be obtained for a cable. It is.
[0010]
An ultrasonic diagnostic apparatus according to the present invention is an ultrasonic diagnostic
apparatus in which an ultrasonic probe including an ultrasonic transducer in which a plurality of
piezoelectric elements are arranged is connected to a main device via a cable, wherein the cable
is From a coaxial cable provided with a plurality of electric signal lines for transmitting at least a
signal of transmission ultrasonic waves to be transmitted from the ultrasonic transducer, and an
optical fiber for transmitting a signal of reception ultrasonic waves received by the ultrasonic
transducer The ultrasonic probe comprises an analog / digital converter for analog / digital
converting a signal received by each piezoelectric element of the ultrasonic transducer, and
parallel / serial of a plurality of digital signals obtained It comprises: a parallel-to-serial converter
for converting; and an electro-optical conversion element for converting an obtained serial
electric signal into an optical signal to be incident on the optical fiber; The transmission circuit
for creating a transmission ultrasonic signal to each of the piezoelectric elements, the
photoelectric conversion element for converting the optical signal emitted from the optical fiber
into an electric signal, and the obtained serial signal are serialized. And a serial / parallel
converter for parallel conversion, and a signal processing unit for reconstructing a tomographic
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image from the obtained digital signals of plural channels and plural bits.
[0011]
According to the above configuration, in the ultrasonic diagnostic apparatus in which the
ultrasonic probe including the ultrasonic transducer in which the plurality of piezoelectric
elements are arranged is connected to the main device via the cable, the resolution is increased.
In order to reduce the number of lines connecting the main unit and the ultrasonic probe as the
number of elements of the piezoelectric element increases, on the ultrasonic probe side, a large
number of piezoelectric elements of the ultrasonic transducer are received The signal is
subjected to analog-to-digital conversion by an analog-to-digital converter, and the obtained
digital signals of multiple bits are parallel-to-serial converted by a parallel-to-serial converter to
be transmitted to the main device.
Corresponding to this, in the main unit, the received serial signal is serial / parallel converted by
the serial / parallel converter, and the tomographic image is re-processed by the signal
processing unit from the obtained digital signal of plural channels and plural bits. Configure.
Thus, by transmitting a received signal with a large amount of information as a serial signal from
the ultrasonic probe to the main unit, the number of wires can be reduced, the complexity of the
connection can be prevented, and the cable can be made thin and flexible. Can be secured, and
the maneuverability can be improved.
[0012]
However, as for the transmission signal and the control signal as appropriate, an optical fiber is
used for transmission of the reception signal as opposed to transmission from the main unit to
the ultrasound probe through the electric signal line as it is. For this reason, the ultrasonic probe
is provided with an electro-optical conversion element, and the main device is provided with a
photoelectric conversion element.
[0013]
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Therefore, as in the case of using all electrical signal lines, the transmission signal of large power
does not affect the reception signal (crosstalk etc.), and as in the case of using an optical fiber for
both transmission and reception, The strength does not decrease and the optical fiber is not
broken. In this way, by performing transmission in a cable in a signal format suitable for an
ultrasonic diagnostic apparatus, that is, a transmission signal is an electrical signal and a
reception signal is an optical signal, it is possible to cope with the increase in the number of
piezoelectric elements.
[0014]
In the ultrasonic diagnostic apparatus according to the present invention, each piezoelectric
element in the ultrasonic transducer is characterized in that an organic piezoelectric layer for
reception is laminated on an inorganic piezoelectric layer for transmission.
[0015]
According to the above configuration, a piezoelectric polymer film such as vinylidene fluoride
suitable for receiving the above-mentioned harmonics in an inorganic ceramic element (inorganic
piezoelectric layer) such as PZT suitable for transmitting high power ultrasonic waves By
laminating (organic piezoelectric layer), it is possible to realize a piezoelectric element capable of
supplementing signal components of harmonics effective for image quality improvement, threedimensional imaging and the like with higher sensitivity.
And since this organic-inorganic laminated piezoelectric element requires signal lines of the
transmitting piezoelectric element (inorganic piezoelectric layer) and signal lines of the receiving
piezoelectric element (organic piezoelectric layer) in addition to the signal line for GND. Since the
number of signal lines is increased, the present invention for realizing the reduction in the
number of lines is particularly preferable.
[0016]
Furthermore, in the ultrasonic diagnostic apparatus of the present invention, the optical fiber is
an organic optical fiber.
[0017]
According to the above configuration, it is possible to use various types of materials such as
inorganic types such as quartz glass, types of organic polymers, etc. for the optical fiber, but
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those having organic flexibility are It is suitable for the procedure operability at the time of
sonographic diagnosis.
[0018]
Further, in the ultrasonic diagnostic apparatus of the present invention, the electro-optical
conversion element is formed of an optical device using an optical transmission photonic crystal.
[0019]
According to the above configuration, an optical device using an optical transmission photonic
crystal can be made several times as large as the wavelength of light to be guided, and compared
with the size of the diameter of the optical fiber. Small enough to reduce the diameter of the
optical fiber.
[0020]
An ultrasonic diagnostic apparatus according to the present invention is an ultrasonic diagnostic
apparatus in which an ultrasonic probe having an ultrasonic transducer in which a plurality of
piezoelectric elements are arranged is connected to a main device via a cable as described above.
In order to reduce the number of lines connecting the main unit and the ultrasonic probe as the
number of elements of the piezoelectric element increases with the increase in resolution, a large
number of ultrasonic transducers are used on the ultrasonic probe side. The signal received by
the piezoelectric element is analog / digital converted by an analog / digital converter, and the
obtained digital signals of multiple bits are parallel / serial converted by a parallel / serial
converter and transmitted to the main unit, Corresponding to this, in the main device, the
received serial signal is serial / parallel converted by the serial / parallel converter, and the signal
processing unit is obtained from the obtained digital signal of plural channels and plural bits. As
well as reconstructing a tomogram and transmitting signals and control signals as needed, it is
transmitted from the main unit to the ultrasound probe via electrical signal lines as it is in the
past, while transmission of received signals is The sound wave probe is provided with an electrooptical conversion element, the main device is provided with a photoelectric conversion element,
and an optical fiber is used.
[0021]
Therefore, since the reception signal with a large amount of information is transmitted as a serial
signal from the ultrasonic probe to the main unit, the number of wires is reduced, the complexity
of the connection is prevented, and the cable is made thin and flexible. Can be secured, and the
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maneuverability can be improved.
Also, as in the case of using all electrical signal lines, the transmission signal of large power does
not affect the reception signal (crosstalk etc.), and as in the case of using an optical fiber for both
transmission and reception The strength does not decrease and the optical fiber is not broken.
In this way, by performing transmission in a cable in a signal format suitable for an ultrasonic
diagnostic apparatus, that is, a transmission signal is an electrical signal and a reception signal is
an optical signal, it is possible to cope with the increase in the number of piezoelectric elements.
[0022]
Hereinafter, an embodiment according to the present invention will be described based on the
drawings.
In addition, the structure which attached | subjected the same code | symbol in each figure
shows that it is the same structure, and abbreviate | omits the description.
[0023]
FIG. 1 is a view showing an appearance configuration of an ultrasonic diagnostic apparatus 1
according to an embodiment of the present invention.
The ultrasonic diagnostic apparatus 1 transmits an ultrasonic wave to a subject such as a
biological body (not shown) and receives an ultrasonic wave from the subject, and the ultrasonic
probe 2. Of the wired type connected to the main unit 3 for producing an ultrasonic tomographic
image in the subject by processing the received signal while creating a transmission signal at the
same time through the flexible coaxial cable 5 It is a diagnostic device.
[0024]
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FIG. 2 is a perspective view showing the structure of the ultrasonic transducer 20 in the
ultrasonic probe (ultrasound probe) 2.
The ultrasonic transducer 20 is configured by arranging a large number of piezoelectric elements
22 on a substrate 21 (in the example of FIG. 2, 6 × 4 = 24 two-dimensional arrays for
simplification of the drawing) There is. FIG. 3 is a sectional view of each of the piezoelectric
elements 22. FIG. 3 shows an example of the organic and inorganic composite piezoelectric
vibrator. In the piezoelectric element 22, from the top (the object side) of the element, the
acoustic lens 221, the first matching layer 222, the organic piezoelectric layer 223, the first
backing layer 224, the second matching layer 225, the inorganic piezoelectric layer 226, the
second It comprises a backing layer 227, a heat conductive layer 228, and the substrate 21. A
cooling layer 229 is formed on the substrate 21.
[0025]
This composite piezoelectric element uses an inorganic ceramic element (inorganic piezoelectric
layer 226) such as PZT for transmitting radiation of ultrasonic waves, and receives vinylidene
fluoride that receives second to higher harmonics from the primary wave from a living body By
laminating a piezoelectric polymer film (organic piezoelectric layer 223) like the above through
the matching layer 225 and the backing layer 224, signal components of harmonics effective for
image quality improvement, three-dimensional imaging, etc. are supplemented with higher
sensitivity. It is a piezoelectric element that can Therefore, since the signal line 24 of the
transmitting piezoelectric element (inorganic piezoelectric layer 226) and the signal line 25 of
the receiving piezoelectric element (organic piezoelectric layer 223) are required in addition to
the signal line 23 for GND, the number of signal lines , But high sensitivity tomographic images
can be obtained. As described above, in the two-dimensional arrangement of 128 × 128 with
three signal lines 23 to 25 per each piezoelectric element 22, it is necessary to wire 49,152 or
more signal lines to the coaxial cable 5. In the following description, the technique for reducing
the signal lines 23 to 25 which is the point of the present invention will be described in detail.
[0026]
FIG. 4 is a block diagram showing an electrical configuration of the ultrasonic diagnostic
apparatus 1. It should be noted that, in the present embodiment, the number of wires is reduced
by transmitting the received signal having a large amount of information as a serial signal from
the ultrasonic probe 2 to the main unit 3, and the connection is complicated. In addition, the
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cable 5 is made thin to ensure flexibility and to improve the operability of the procedure. Next,
transmission signals and control signals (the control signal lines are omitted in FIG. 4), etc., are
transmitted from the main unit 3 to the ultrasound probe 2 through the electric signal lines 51 as
it is. On the other hand, for transmission of the reception signal, by using the optical fiber 52, the
influence (crosstalk etc.) of the transmission signal of large power on the reception signal is
eliminated, and the strength of the coaxial cable 5 is properly maintained. .
[0027]
Specifically, in the ultrasound probe 2, the transmission signal from the main device 3 is
transmitted from the electric signal line 51 of the coaxial cable 5 through the signal line 24 to
the transmission piezoelectric element of each piezoelectric element 22. (Inorganic piezoelectric
layer 226). The received signal at each receiving piezoelectric element (organic piezoelectric
layer 223) by this is inputted from the signal line 25 to the receiving circuit 26, and after being
amplified by the amplifier circuit 27, the analog / digital converter 28 Each 22 is converted into
a digital signal of a predetermined number of bits. The multi-bit digital signal is converted to a
serial signal by the parallel / serial converter 29 and then converted to an optical signal by the
electro-optical conversion device 30, and is incident on the optical fiber 52 of the coaxial cable 5.
The amplification circuit 27 also includes a variable gain adjustment circuit that amplifies the
received signal in accordance with the input range (dynamic range) of the analog / digital
converter 28.
[0028]
On the other hand, in the main unit 3, the optical signal from the optical fiber 52 is first
converted to an electric signal by the photoelectric conversion element 31, and converted to a
parallel signal by the serial / parallel converter 32, and then the beam former circuit 33 Is input
to In the beam former circuit 33, the signal of the address generated by the address generation
circuit 35 is converted at the timing created by the synchronization circuit 34, and the received
signal at each piezoelectric element 22 is adjusted by adding a delay time. Phase addition is
performed to form a beam of a desired shape at a desired depth. The beam-formed signal is
filtered by the filtering circuit 36 to a primary wave of the same frequency as the transmission
ultrasonic wave and high-order harmonics such as a secondary wave according to the frequency,
and further detected by the detection circuit 37, It is transmitted to a digital signal processing
circuit (DSP) 38, and the tomographic image is reconstructed. The tomographic image is imaged
by a display device 39 such as a liquid crystal display element or an EL display element. The
beam former circuit 33, the synchronization circuit 34, the address generation circuit 35, the
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filtering circuit 36, the detection circuit 37 and the DSP 38 constitute a signal processing unit
which reconstructs a tomographic image.
[0029]
The DSP 38 performs various arithmetic processing such as logarithmic conversion processing,
filter processing, and γ correction as pre-processing for imaging received beams. The digital
scan converter (not shown in the figure but between the DSP 38 and the display device 39) forms
image data according to the data output from the DSP 35 for each scan of the ultrasonic beam,
and the display device 39 is digital A digital display is used which can display the data as it is.
[0030]
On the other hand, from signal reception by the DSP 38 to image formation based on the
reception result, generation of a transmission signal is controlled by the central processing
circuit 41 in the transmission circuit 40 which is an overall control unit. Further, the central
processing circuit 41 controls the transmission control circuit 42 to form a beam of a desired
shape at the desired desired depth, and each piezoelectric element from the drive signal
generating circuit 43 via the electric signal line 51. 22. A transmission signal (pulse) of high
power is output.
[0031]
In diagnosis, in the ultrasonic diagnostic apparatus 1 configured as described above, the
ultrasonic probe 2 is brought into contact with the body surface of the test site of the subject,
and the scanning numerical value such as the transmission focal depth from the operation panel
44 After the input, when the ultrasonic scan start command is input, the central processing
circuit 41 controls each circuit to start an ultrasonic scan. First, the central processing circuit 41
outputs, to the transmission control circuit 42, a drive pulse output command and a command
for setting a delay time according to the transmission focal depth (beam shape). In response to
these commands, the transmission control circuit 42 causes the drive signal generation circuit 43
to generate drive signals (pulses) to the respective piezoelectric elements 22, and the drive
signals are transmitted to the respective piezoelectric elements 22 via the electric signal line 51.
Given to The piezoelectric element selected by the selection command in the ultrasound probe 2
vibrates at a predetermined fundamental frequency when a drive signal (pulse) is input, and
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sequentially transmits ultrasound waves into the object.
[0032]
In this way, the ultrasonic waves transmitted into the object are partially reflected by the
different surfaces of the acoustic impedance of the tissue or organ in the living body, generating
a fundamental reflected wave and high-order harmonics to perform ultrasonic wave detection.
Reach the tactile element 2. In order to receive this arrival wave, the central processing circuit 41
controls the receiving system through the DSP 38. At this time, the piezoelectric element used for
reception is selected by the DSP 38 controlled by the central processing circuit 41 by the beam
former circuit 33 according to the scanning numerical value condition inputted from the control
panel 44, and the beam former circuit 33 is further selected. Beamforming is performed by
controlling and adding the delay time of the reception signal from the selected piezoelectric
element. By these controls, the ultrasonic waves generated as the ultrasonic waves propagate
from the shallow site to the deep site in the subject are received.
[0033]
At this time, the signal received by the ultrasonic probe 2 is converted into a digital signal by the
analog / digital converter 28, and then the number of output bits of the analog / digital converter
28 by the parallel / serial converter 29. The signal is transmitted to the serial / parallel converter
32 in the main unit 3 via the smaller number of optical fibers 52. For example, if the output of
the analog-to-digital converter 28 is 8 bits, the parallel-to-serial converter 29 is a single optical
fiber including 8 bits, or the 8 bits are per element of the piezoelectric element 22 In the case of
grouping a plurality of elements, bits of the element number multiple are collected and
transmitted by one optical fiber.
[0034]
As a result, the number of lines connecting the main unit 3 and the ultrasonic probe 2 can be
reduced even with an increase in the number of elements of the piezoelectric element 22 due to
the increase in resolution, preventing the wiring from becoming complicated. Also, the coaxial
cable 5 can be made thin to ensure flexibility, and the operability of the procedure can be
improved. Moreover, since the optical fiber 52 is used for transmission by using the electrooptical conversion element 30 and the photoelectric conversion element 31 for the reception
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signal with respect to the electric signal line 51 of the transmission signal of large power, the
coaxial cable Even if the transmission signal and the reception signal move close to each other
within 5, it is possible to prevent the occurrence of crosstalk of the signal current and to
eliminate the need for impedance control of reception. In addition, when the optical fiber 52 is
used for both transmission and reception, the strength of the coaxial cable may be reduced and
the optical fiber may be broken. Therefore, it is possible to cope with an increase in the number
of elements of the piezoelectric element 22 by performing transmission on the coaxial cable 5 in
a signal format suitable for the ultrasonic diagnostic apparatus 1 in which the transmission
signal is an electrical signal and the reception signal is an optical signal. it can.
[0035]
As the optical fiber 52, various types of materials such as inorganic types such as quartz glass
and types of organic polymers can be used, but organic flexible ones having operability during
ultrasonic diagnosis Preferred. In the above description, the electrical signal line 51 and the
optical fiber 52 are bundled in the coaxial cable 5, but the thin optical fiber 52 may be attached
to the thick electrical signal line 51. However, it is preferable to combine them into a single cable
in view of the procedure operability. At that time, whether or not to twist may be appropriately
selected according to the thickness of the cable and the number of wires.
[0036]
On the other hand, it is preferable to use an optical device using an optical transmission photonic
crystal as the electro-optical conversion element 30. A photonic crystal is an optical device
obtained by arranging a periodic change in refractive index in a light-transparent material such
as silicon dioxide, and for example, periodically laminating holes in the material Can be created
by The photonic crystal has a wavelength region in which light can not enter due to the
refractive index control layer, and has the property of strongly reflecting light in this region. The
size of an optical device using this photonic crystal can be several times the size of the
wavelength of light to be guided. For example, the size of the optical device using quartz glass
can be about 40 to 80 μm because the wavelength of light used for optical communication is
about 1.6 μm and the refractive index of quartz glass is about 2 . As described above, the optical
device using the photonic crystal is sufficiently small compared to the size of the diameter of the
optical fiber, and the diameter of the optical fiber 52 can be reduced to about 100 μm.
[0037]
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By the way, in order to configure the system, it is necessary to optically couple the electro-optical
conversion element 30 and the optical fiber 52. Therefore, there are various methods of optically
coupling the electro-optical conversion device 30 and the optical fiber 52, but for example, a
method of optically coupling the electro-optical conversion device 30 and the optical fiber 52
using an optical lens There is a method of processing the end of the optical fiber 52 to be
tapered so as to give the function of the optical lens to the end and optically couple the electrooptical conversion element 30 and the optical fiber 52. The optical coupling is performed
between the element 30 and the optical fiber 52 with optical alignment. In order to couple the
electro-optical conversion element 30 and the optical fiber 52 by such a method, the core portion
and the clad portion of the optical fiber 52 are structurally processed directly in order to give
freedom in alignment of coupling. Alternatively, a configuration method of an optical fiber as a
photonic crystal may be adopted.
[0038]
FIG. 5 is a cross-sectional view showing a specific structural example of the coaxial cable 5. As
described above, in disposing the optical fiber 52 and the metal electrical signal line 51 such as
copper in the same cable 5 to reduce the crosstalk of the electrical signal, the coaxial cable 5a of
FIG. An example in which the optical fiber 52 is disposed outside the signal line 51 is shown. The
coaxial cable 5b of FIG. 5 (b) shows an example in which the optical fiber 52 is disposed also on
the inner core side. The coaxial cable 5c shown in FIG. 5C shows an example in which the optical
fiber 52 and the electrical signal line 51 are arranged so as to be sparse, and the influence of the
interference with the transmission signal itself is reduced. The electrical signal lines 51 are
preferably arranged so as not to be adjacent to each other as much as possible, and the
arrangement as shown in FIG. There are other arrangements for avoiding mutual interference,
but they can be selected as appropriate.
[0039]
In the example of FIG. 5, the number of lines of the electrical signal line 51 and the optical fiber
52 is drawn approximately equal, that is, except for the common GND line, the electrical signal
line 51 and the optical fiber 52 A buffer memory is provided in front of the parallel / serial
converter 29, and the number of optical fibers 52 is increased by performing time axis
compression and multiplexing for a plurality of channels as described above. It can be greatly
reduced.
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[0040]
The invention made by the inventor of the present invention has been specifically described
based on the embodiment of the invention, but the invention is not limited to the embodiment of
the invention, and the scope of the invention is not deviated from the gist of the invention. Of
course, various modifications are possible.
[0041]
It is a figure which shows the external appearance structure of the ultrasound diagnosing device
which concerns on one Embodiment of this invention.
It is a perspective view which shows the structure of the ultrasonic transducer | vibrator in an
ultrasonic probe (ultrasonic probe).
It is sectional drawing of the piezoelectric element in the said ultrasonic transducer | vibrator. It
is a block diagram which shows the electric constitution of the said ultrasound diagnosing device.
It is sectional drawing which shows the specific structural example of a coaxial cable.
Explanation of sign
[0042]
Reference Signs List 1 ultrasonic diagnostic apparatus 2 ultrasonic probe 3 main unit 5 coaxial
cable 20 ultrasonic transducer 21 substrate 22 piezoelectric element 221 acoustic lens 222 first
matching layer 223 organic piezoelectric layer 224 first backing layer 225 second matching
layer 226 Inorganic piezoelectric layer 227 Second backing layer 228 Thermal conductive layer
229 Cooling layer 23 Signal line for GND 24 Signal line for transmission 25 Signal line for
reception 26 Reception circuit 27 Amplifier circuit 28 Analog / digital converter 29 Parallel /
serial conversion 30: Electro-optical conversion device 31: Photoelectric conversion device 32:
Serial / parallel converter 33: Beam former circuit 34: Synchronization circuit 35: Address
generation circuit 36: Filtering circuit 37: Detection circuit 38: Digital signal processing circuit
(DSP) 39: Display device 40: Transmission circuit 41: Central arithmetic circuit 42 Transmission
control circuit 43 Drive signal Generator circuit 51 electrical signal line 52 optical fiber
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