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The present invention relates to an ultrasound probe used in an ultrasound diagnostic apparatus.
As an ultrasonic probe, a piezoelectric vibrator in which electromagnetic waves are formed on
both sides of a piezoelectric ceramic plate such as a zircon-lead titanate (PZT-based ceramic or
the like) is used for generation and detection of ultrasonic waves. However, when used for
ultrasonic diagnosis of a human body, for example, the acoustic impedances of the piezoelectric
ceramic and the human body are significantly different, so even if the vibrator is brought into
direct contact with the human body, ultrasonic waves can not be effectively transmitted
internally. Therefore, a material whose impedance is in the middle of the human body and the
pressure electromagnetic device is used on the vibrator as a sound matching layer. An epoxy
resin filled with an appropriate inorganic material is often used for this acoustic matching
material, and matching! It is formed so that thickness of-becomes wavelength 1 of a super-one
wave, and ?4 / 11 / C. This will be described below, for example, with reference to the structure
of an array probe of interpositional type. The piezoelectric ceramic plate 11 which has been
subjected to polarization treatment by the polarizations 12 and 13 as shown in FIG. That is, only
the portions 14 where the polarizations on both sides are facing each other are pressure-active. It
adheres to such a vibrator all backing material, and it cuts in the shape of a strip and leads 4!
After the t-attachment, as shown in FIG. 2, the acoustic matching no 15 is formed over the entire
surface of the moving element 21. Usually, this acoustic matching layer is produced by a process
such as pouring on the resin total loss element and solidifying, and then polishing to a
predetermined thickness. In addition, 16 is a back load material. However, in the conventional
ultrasonic probe, since the acoustic matching layer is formed on the entire surface of the
vibrator, even the piezoelectrically inactive both ends IIh to which the lead wire 24 is attached
are effective as sound waves. It is sent to the subject. The vibration at both ends is complicated
due to the thickness direction vibration of the piezoelectrically active central portion and
adversely affects the formation of an ultrasonic beam in the object. Therefore, an object of the
present invention is to provide an ultrasonic probe in which shadows # of complicated vibration
at both ends of the fR motion are removed. The ultrasonic probe according to the present
invention is characterized in that the acoustic matching no is selectively provided only in the
piezoelectrically active portion of the piezoelectric vibrator, that is, in the central portion where
the electrodes on both surfaces face each other. In this case, since the ends of the vibrator do not
match in acoustic impedance, the vibration of the end is not effectively transmitted as a sound
wave into the object. That is, since the ultrasonic wave is generated only from the
piezoelectrically active central portion vibrating in the thickness direction, the beam can be
formed substantially around the design.
Such an acoustic matching layer can be easily formed, for example, by screen printing. An
example of an actual sleeve of F-color light will be described with reference to FIG. Thickness
0.28 mm, width 12 mm as pressure dtri motion f. A lead titanate piezoelectric ceramic plate
having a length of 74 mm was used. The width of the part where the electrodes of the [1 il] are
interrogated is 9 mm C. After bonding this piezoelectric vibrator to E of hard rubber (back load
material 16) containing ferrite powder using an epoxy resin, it was cut into strips with a 0.5 mm
pinch. In addition, the groove | channel produced by cutting was filled with the organic
substance. Next, 250 mesonille screen printing on which a rectangular pattern of 9 mm О 74
mm was formed, and the tliitt composite material was printed only on the central portion where
the four poles were facing as shown in FIG. The sound # mixing material used what mixed am
powder of tungsten powder with epoxy resin. After the printed alignment 1-17 solidified, the PA
thickness was measured to be about 50 ?m. In addition, the uniformity of the revetment was
within ▒ 3 ?m. The film thickness is about 4/1 of the wavelength of the sound wave, since the
sound velocity of the matching no using the center circumference of the transducer is 7.5 A4 Hzx
is -1400 m / s. Finally, leads 4s24 were attached to the uncoated end portions of the composite.
The profile of the ultrasonic beam was compared with the ultrasonic probe having the composite
layer formed on the entire surface of the transducer by the conventional method, as compared
with the ultrasonic probe having the composite layer formed by the conventional method. It
became clear that the value is closer to 1iii. Furthermore, when the same acoustic lens is attached
to both of the probes, and one tomographic image of the abdomen and the thyroid section of the
human body is photographed, the present invention of d! The effect was that he probe was
superior. In the present embodiment, although the four-tone matching layer is described as a
single layer, it is obvious that the same effect can be obtained even in the case of many f-,
without being limited to one layer. In particular, alignment of the ultrasound probe of the present
invention by screen printing method etc.? When forming-, it is possible to easily form a multi-fbonding layer by mask alignment. FIG. 4 is a view for explaining a method of forming an acoustic
matching no by screen printing. The vibrator 41t in contact with the back load member 42 and
the vibrator portion cut off 4 is inserted into the fixing jig 43 whose height t is matched. Next,
the screen 45 cut from the predetermined pattern 44 is placed so that the pattern 44 is located
at the center of the vibrator 41 (right above the polarized part).
The putter 744 is a mesh of appropriate size, through which the composite is delivered onto the
transducer. As shown in Fig. J5, after installing the screen 45, the composite material is supplied
onto the screen, and the screen 45 is pressed against the pendulum 41 with an appropriate
pressure using a rubber-like 0 head 46, and the head 46 is patterned. Printing is performed by
moving at a constant speed along the.
Brief description of the drawings
Fig. 1 shows the pressure I! Used for the array type ultrasound probe.
FIG. 2 is a cross-sectional view of an array type ultrasound probe, and FIG. 3 is a view showing
one real axis example of the ultrasound probe according to the present invention, FIG. 4 and FIG.
Is a figure explaining the manufacturing method. 1, 1 иии Pressure porcelain plate, 12.13 и и и и и и и и и
15 continued on page 1 0 presenter Shigemura Sadamura Higashi Koi Kubo 1-chome address
Kotobuki 1-chome Hitachi, Ltd. Central Research In the office
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description, jps58198998
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