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JPS54131380

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DESCRIPTION JPS54131380
Description 1, title of the invention
Array type ultrasound probe
3. Detailed Description of the Invention The present invention relates to an array-type ultrasound
probe in an electronic scanning ultrasound tomography apparatus. In general, an array-type
ultrasonic probe consists of a plurality of narrow rectangular transducers arranged at equal
intervals, and the structure is as shown in FIGS. 1 and 2, on a sound absorbing material (1). After
bonding the vibrator plate (3) with the electrodes (2) deposited or baked on both sides, the
vibrator plate (31 is cut into equal parts at a desired width and interval (d) to form a vibrator
element (4 Group), and a single layer or plural intermediate layers (5) are adhered thereon. As
well known, when such an ultrasonic wave is emitted to a living body, such a probe is
acoustically mismatched (because of acoustic impedance mismatch, and most of the acoustic
energy EndPage: 1 is reflected to the inside of the transducer). So that the medium 7 is about a7
X 1 G 7 n? It is required to have a 5LaO value and a small amount of attenuation, and a hard
material is generally used. However, in the array-type ultrasonic probe, the direction of the
ultrasonic wave emitted from the probe is due to the synthesis of the sound wave that regards
the transducer element as a point sound source, so a rectangular and narrow transducer element
It is required that the ultrasonic wave emitted from a near non-directionality, but when using a
hard material as the intermediate layer (5), the interference between each transducer element
will have directionality. , There is a problem. That is, when an ultrasonic wave is scanned in a fanlike manner, the efficiency of transmission and reception becomes worse as the scanning angle
becomes larger, resulting in the disadvantage that the transmission output and the reception
sensitivity are lowered. The present invention solves such a drawback, and the following
description will be made based on the embodiment shown in FIG. 8 and FIG. 4 below: # 54-
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431380 0 (11 is a sound absorbing material, (2) is a vibrator After bonding the vibrator plate 1
(3) on the sound absorbing material (1) with the plate (the vibrator plate (3; deposited or ripped
on both sides of 31), the intermediate layer (6) is stuck thereon And finish the flatness of the
surface. As described above, the intermediate layer (6) has an acoustic impedance which is an
intermediate value between the living body and the vibrator, for example, about 6.7 × 10 Kp / m
′ ′ 5jcO, and a hard material having a desired thickness of, eg, k (λ) Is the wavelength of the
ultrasonic wave propagating in the intermediate layer), or it is finished as a flat plate with good
flatness, or the material finished with one with good flatness is bonded to the above-mentioned
transducer plate (3) The surface is polished and finished to a desired thickness. Next, this
vibrator plate (3) is cut along with the intermediate layer (6) with a desired width and distance to
form an array of vibrating four elements (4) on which the intermediate layer pieces (7) are fixed.
After each transducer element to be connected is soldered with conducting wire +91 + 91 to the
connection terminal + 81 + 81 of double-sided electrode + 21 [21 by many etc., soft resin 11a)
For example, the same material is used as a covering material (12 &) at the same time as filling
with an epoxy-based soft resin having a hardness of 90 (, rxs-A) or less and an acoustic
impedance of 15 to 10 XIOK fz 曾 at C at final curing. Intermediate layer (7) Group 0 covers the
surface and forms 1 probe 6 · 1 ‒ 4 shows another embodiment, a vibrator element (with +21
+21 deposited or baked on both sides 1) A sound absorbing material (1) is bonded to one surface
2 of 4 and an intermediate layer piece (7) is bonded to the other surface in n stages on the other
surface. In each intermediate layer in this case, the acoustic impedance is a value between the
vibrator plate and the bioacoustic impedance, and has a value of PR type which decreases from
the imaging and moving plate side in a linear manner, and a hard material is preliminarily made
Use a material that has a desired thickness, for example, each intermediate layer, and is finished
in a flat plate with good flatness, or a material with a finish that is tightened in a flat surface with
good flatness, from the moving plate side Then, bonding is sequentially performed, and after
fixing, polishing is sequentially repeated to form an intermediate layer of n. Hereinafter, the
formation of the transducer element (4), between the transducer elements (filling of 1 G, and
coating of the surface of the intermediate layer form a probe in the same manner as in the
embodiment described above. In the array-type ultrasonic probe according to the present
invention as described above, the acoustic interference between adjacent transducer elements is
reduced, and both of the vibrator having a large acoustic impedance value and the living body
having a small acoustic impedance value are used. Proper impedance matching can be obtained
between them, and it has the effect that efficient transmission and reception can be performed.
4. Brief description of the drawings FIG. 1 is a perspective view of a conventional array-type
ultrasonic probe, FIG. 2 is an explanatory view showing the order in which the transducers of
FIG. 1 are formed, and FIG. FIG. 4 is a partially cut away perspective view showing an example of
the assembly structure of FIG. 4, and FIG. 4 is a perspective view showing another example. (1) ...
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sound absorbing material, (2) ... electrode, (3) ... vibrator plate, (4 振動 子 vibrator element, + 51
tel ... middle layer, (7) ... middle layer piece, .alpha.F · · gap, (ttg) ... filler, (11 &) ... dressing
EndPage: 1 Figure 2 acid second self Liao 4 Figure EndPage: 3
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