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Description 1, title of the invention
Ultrasound probe
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasound
probe because it has a vibrating element, and more particularly to its acoustic matching layer. It
is desirable that an ultrasonic probe that transmits and receives pulse ultrasonic waves have a
wide frequency band in order to transmit and receive pulses in a faithful manner. Although
various methods can be considered as means for meeting this demand, there is a method of
attaching a matching layer to a piezoelectric vibrator as a commonly used method. As an example
conventionally performed, as shown in ts 1, the acoustic matching plates 3 and 4 having a
thickness of 1⁄4 of the wavelength of the ultrasonic wave to be emitted are attached to the
electrode 5 of the piezoelectric vibrator 1 to transmit and receive ultrasonic waves. There is a
method of transmitting and receiving an ultrasonic wave to the medium 2 of a human body or a
water town as a face. In this example, two acoustic matching layers are provided. In addition to
EndPage: 1, this may be a single layer or a multiple layer. According to this method, a desired
frequency band can be obtained by changing the acoustic impedance of the / 4 m long matching
plate between the piezoelectric transducer 10 acoustic impedance value and the acoustic
impedance value of the medium 2 gradually while changing it repeatedly become. However, the
manufacturing technology of the multilayer / 4 wavelength matching layer is difficult, and what
is put to practical use at present is only the one in which the 1/4 wavelength acoustic matching
plate is made into two layers. Therefore, it is a fact that there is a limit to wide band. The present
invention solves this problem and aims to provide a broadband matching layer. Next, the present
invention will be described in detail with reference to the drawings. FIG. 2 is a view showing a
cross section of a probe according to the present invention. As shown, the piezoelectric vibrator
11 has an electrode 1! ! , 14 ', and the electrode 15 has a matching plate with a thickness of 1⁄4
wavelength of the emitted ultrasonic wave and a matching plate with a thickness of 2
wavelengths, and 9 pieces of them are mounted to form a matching layer The characteristics will
be explained. The wave number characteristics of the piezoelectric vibrator having the plywood
made of the piezoelectric vibrator having the matching plate having the thickness of / 4
wavelength has a peak at the center as shown in FIG. 5). From this, the overall frequency
characteristic of the matching layer in which the two matching plates are superimposed is a riff
as shown in FIG. 3 (C). Flat with few pulls. In addition, the characteristics of the same band as
that of the band possessed by the matching plate of 4 wavelength thickness are obtained.
Therefore, if a matching plate with a thickness of 4 and a matching plate with a thickness of 1
and 2 are stacked on top of each other as described above, a gold plating layer is used as the
acoustic matching layer of the ultrasonic probe. A child is obtained. As an example of the present
invention, in the case where a piezoelectric ceramic (acoustic impedance 55.times.5.times.10'kg /
G0 1) is used as a piezoelectric vibrator and an ultrasonic wave is radiated into water as a
medium, the acoustic impedance is applied to a 1/4 wavelength thick matching plate. A 15/1 to
1/9 rts material (eg fused silica), a half-wave thick matching plate 4.5 x 10 '/ C1?
With the material of / 11t8, the target number y is obtained. Alternatively, for a further wide
band, it is necessary to use an acoustic impedance of 45 × 10 @ kg / body S (for example, one
with larger acoustic impedance as a quarter wave matching plate). It is better to select it and set
it to the piezoelectric vibrator side. If the material used for the 14-wavelength thick matching
plate is a material having a relatively large ultrasonic attenuation, the transmission and reception
gain characteristics of the crane S can be made broadband. In the history, a damper material as
conventionally used can be attached to the back of the piezoelectric vibrator. As described above
in detail, according to the present invention QAK, an ultrasonic probe having a flat, broad-band
transmission / reception gain characteristic which is used as a gold layer and which compensates
for the defects of both transmission / reception gain characteristics of 9 is obtained.
4. Brief description of the drawings Fig. 1 is a cross-sectional view of a conventional ultrasonic
probe, Fig. 2 is a cross-sectional view of an ultrasonic probe according to the present invention,
and Fig. 6 is a transmission and reception gain of an acoustic matching layer. It is a figure which
shows a characteristic, and is a figure which shows the synthetic ¦ combination transmission /
reception gain characteristic which put together. 1.11: piezoelectric vibrator, 2.12: medium, 5 °
4.13.14: matching layer, electrode patent applicant Nippon Radio Industries, Ltd.
Company Agent Attorney Attorney Outside 2 EndPage: 2 Figure 3 EndPage: 3
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