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JPS57106295

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DESCRIPTION JPS57106295
Specification 1, Title of the Invention 2,%, v-F @ Desired Range In an ultrasonic transducer
provided with a piezoelectric body provided with an electrode of an ultrasonic wave oscillating
piece, and a lens for converging and transmitting ultrasonic waves An ultrasonic transducer
characterized in that a WLIX radiation prevention body with the piezoelectric body t lens is
provided, or an anti-reflection body is provided on the lens surface.
Ultrasonic transducer
3. Detailed description of the invention The present invention relates to an ultrasonic transducer
that reduces loss due to reflection occurring during transmission and reception of ultrasonic
waves. In a conventional ultrasonic transducer, two electrodes are attached and attached with an
adhesive or the like to both sides of a piezoelectric body having a shape suitable for ultrasonic
H'fr excitation of a predetermined frequency. An acoustic focusing lens is disposed in close
proximity to a piece of I-Ji-Ci of A-Ji-shi. When both high-frequency and low-temperature signals
are connected to the above-mentioned electrodes and a cable for reception is connected during
the daytime and the other end of the pre-symptoms cable is supplied with pulsed high-frequency
voltage. The high frequency voltage excites the piezoelectric body, and the excitation is
transmitted as a vc dense ultrasonic wave in a general direction vc by a focusing lens provided in
close contact with the electrode on the ground side. The ultrasonic waves transmitted in the
predetermined direction are attenuated by the propagation 9 and reflected by an object of
different acoustic impedance, and a part of the reflected wave is focused as an information signal
by the focusing lens to excite the piezoelectric body. . This excitation generates micro surface
frequency voltages at both electrodes, which are amplified by an amplifier through the cable and
reproduced in a cathode ray tube. In this case, the high frequency signal transmitted in a pulse
form, the time delay of the received signal, the waveform to be transmitted, and the change
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(height and spread) of the received waveform are provided in front of the convergent lens. We
can give information on the acoustic properties of matter. Therefore, close to Keito, which is
trying to test the convergence, closely press it so that ultrasonic waves propagate, check the
waveform of the reflected wave, etc. and know the condition of the affected part EndPage: 1 it
can. The (ultra) acoustic wave propagates in the medium, and has different specific acoustic
impedances (L, medium density t?, and its sound speed fc, it is PC. Reflect at the interface of the
medium with. In this conventional ultrasonic transducer, as described above, the focusing lens is
disposed close to the ground electrode provided on one side of the piezoelectric body, causing
noise. Therefore, when the piezoelectric body is excited by the high frequency voltage, the
difference in acoustic impedance at the interface between the converging lens and the mountain
reduces the amount of light that is partially reflected and transmitted. On the other hand, when
this lens #JVc is incident, it is also reflected due to the difference in acoustic impedance at the
interface when the lens #JVc is incident on the (micro) signal that should be countered in the
affected part of the living body etc. It is reflected at the interface between the piezoelectric
element and the piezoelectric element, and is less likely to be transmitted to the piezoelectric
element.
Therefore, in the conventional ultrasonic transducer, it is f not good to obtain the necessary
information because the loss due to reflection is considerably large lv when transmitting and
receiving ultrasonic waves. The present invention has been made based on the circumstances of
the past, and the objective is to reduce the reflection loss caused by the members constituting the
ultrasonic transducer, and to enhance the efficiency of the oscillation and reception substantially
higher than VC. It is VC to provide an ultrasonic transducer. An embodiment of the present
invention will be described below with reference to the entire drawings. In the drawing, an
ultrasonic transducer ?, a piezoelectric body 4 provided on all sides of the signal electrode 2
and the ground electrode 3 in a housing case 1 for storage, a focusing lens 5 for transmitting an
ultrasonic wave ffk, and a piezoelectric body The rc anti-reflection member 6 is disposed in close
contact with both the lens 4 and the converging lens 5, and the anti-reflection member 7 is
disposed in close contact with the concave surface of the front surface of the converging lens 5 It
is done. Further, a backing 6 material 8 for absorbing a sound wave is attached closely in close
contact with the signal electrode 2 attached to the inside of the case 1 and the signal electrode 2
attached to the piezoelectric body 4, and the signal transmission / reception cable 9 is
converged. In the ground electrode 3 @ connected to the outside I IQ a-gland of the H cable 9,
the gold practice part VC I of the case 1 for storing the entire ultrasonic transducer is transmitted
and applied to the human body by the high voltage signal at the time of transmission. It is
supposed to prevent the impact. The ground of the piezoelectric body 4 is disposed on the side of
the anti-reflection body 6 and the convergent lens 5 following the anti-reflection body 6 in order
to prevent the influence on the human body as described in @. It is a thing of-. Generally, the
materials of the piezoelectric body 4 and the focusing lens 5 are different, and hence the specific
acoustic impedances of both are different. Therefore, if the two are placed in close contact with
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each other as described in q), reflection occurs when ultrasonic waves propagate. In the present
invention, rJ, in order to reduce this reflection, a unique anti-reflection member 6 disposed
between the acoustic impedances of the two is disposed unique l'ij VC, and is brought into
contact with the converging lens 5 and the converging lens 5 An anti-reflection member 7 having
an intermediate value of the folding impedance of the object is attached to the surface of the
converging lens 5 as a major feature. The arrangement and use of these antireflectors 6 and 7
still produce reflections, but because the reflectance is approximately equivalent to the square of
the difference between their acoustic impedances, it is especially possible to use them between
members having a large difference between their impedances. Mid value of impedance of both
parts and members? A: When the anti-reflection body 6 or ri 7 is provided, it has an effect of
reducing attenuation due to reflection.
Accordingly, the acoustic impedances of the piezoelectric body 4 and the converging lens 5 are
equal to t, for example, in these antireflectors 6 and 7, and they are not necessarily required for
the antireflector 6 when selected. Also, when the acoustic impedances of the object brought into
close contact with the convergent lens 5 are equal [i is not necessarily required for the
antireflector 7. Converging lens 5 is supersonic ff? The main function is to converge and
transmit, but ?tf 41% of the piezoelectric body 4 and the object?! When the difference in
impedance is large, the value is set to an intermediate value between the acoustic impedance of
the convergent lens 5 and the anti-reflectors 6 and 7 as described above, the convergent lens 5'-!
Antireflection 8?! Is it better to know v? : Working pressure ? It will be b. Needless to say, it is
possible to reduce the EndPage: 2 loss, which is not provided at all, even if only one of the
antireflective members 6 and 7 is provided. In the above description, the antireflector 6 is made
of a material having a single acoustic impedance, or is inserted between the antireflector 6 whose
acoustic impedance is formed in layers. If the difference with the acoustic impedance on both
sides is made smaller stepwise, loss due to reflection will be lost! ll @ I can do something similar
K. Furthermore, if the acoustic impedance of the antireflector 6 or 7 is changed (substantially)
continuously so that the vc can be connected (continuously) continuously with the acoustic
impedance on its both sides, it is an effective 9M effect. Step by step different things of acoustic
impedance ? form b! In the case of the interval i, j + the wavelength of the ultrasonic wave
which is j is increased, it can be said to work effectively on the above function if it is increased.
As described above, according to the present invention, ultrasonic vibration-+-1 / ILbk blood,
where the antireflector is inserted-(, k! There is an effect that it is possible to reduce the entire
loss due to the reflection occurring between the Sumura and the ultrasound transducer with
excellent sensitivity.
FIG. 4 is a cross-sectional view showing one example cap of the ultrasonic transducer of the
present invention in the simple explanatory drawing of the drawings. l и и и и и и и и и и и и и и и и и и и и и и и и
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и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и ?l иииииииии Antireflection EndPage: ?
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