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The present invention relates to an ultrasonic probe which is emitted from a pressure section
ceramic vibrator, enters ultrasonic waves into a living body, and reflects super tr 1) li reflected
from the living body into an electrical signal by means of a piezoelectric ceramic. . In this
conventional ultrasonic probe, ultrasonic waves emitted from a single piezoelectric ceramic
transducer having a single resonance frequency are refracted by an acoustic lens, and an
ultrasonic beam is focused to enter a living body. However, ultrasonic waves with high resonant
frequency are good for distance resolution + but have low sensitivity and are not suitable for
deep detection, and ultrasonic waves with low resonant frequency have good sensitivity and are
suitable for deep detection There is a low drawback for distance resolution. The present
invention solves the drawbacks of the above-mentioned conventional ultrasonic probe by
forming an ultrasonic probe provided with two or more piezoelectric ceramic vibrators having
different resonance frequencies in view of this point K. It is the purpose. Embodiments of the
present invention will be described with reference to the drawings. 1 and 2 are independent
piezoelectric ceramic vibrators having different resonance frequencies, and their resonance
frequencies are made of the respective materials and shapes (length L 1 ′ ′! s width '1' t
thickness T, 'r,) Wc determined. Reference numerals 6.4 and 5.6 denote surface electrodes
formed on the surfaces of the vibrators 1 and 2 by vapor deposition, plating, or the like.
Reference numeral 7 is a backing for collecting 1 μ of ultrasonic waves emitted to the rear of
the transducers 1 and 2. Reference numerals 8 and 9 are matching layers disposed in front of the
transducers 1 and 2, respectively, for curing the filling of a quarter of the wavelength of the
vibration at the resonance frequency VC of the transducer 1.2. 2. Align the distortion so that the
ultrasonic waves emitted from 2 can be efficiently emitted by a living person. Reference numeral
10 is an acoustic / focussed focusing ultrasonic wave that has passed through the matching layer
8.9. Note that although the acoustic lens 10 shown in the drawing is a convex lens, this is a case
in which the propagation speed of the ultrasonic wave during sound / image is I11 smaller than
the propagation speed in the living body, and is faster It is possible to use a concave lens for μcombination. When the acoustic lens 10 is in contact with the living body, the ultrasonic waves
are focused on the focal point C of the acoustic lens 10. A and B show the sound field of vibration
at the resonance frequency of the vibrators 1 and 2. A high frequency pulse having a resonance
frequency component of the vibrators 1 and 2 is applied to the surface electrodes 6.4 and 5.6 of
the vibrators 1 and 2 by lead wires not shown, respectively. The ultrasonic waves generated in
the transducers 1 and 2 by the high frequency pulse pass through the matching layers 8 and 9,
are focused by the acoustic lens 10, and enter the living body.
The ultrasound reflected by the living body takes the reverse course and enters the transducers 1
and 2 and is converted into an electrical signal. As described above, the ultrasonic probe
according to the present invention is characterized in that an acoustic lens for focusing on the
resonance circumference of two or more piezoelectric ceramic vibrators having different
resonance frequencies is provided on the surface of the plurality of piezoelectric ceramic
vibrators. I assume. Therefore, among ultrasonic waves emitted from a plurality of transducers,
an ultrasonic wave having a high resonance frequency performs a good search for distance
resolution in a shallow part of the living body, and an ultrasonic wave having a low resonance
frequency searches a deep part of the living body As a result, the function of the ultrasound
probe can be improved to achieve the object of the present invention described at the beginning.
Brief description of the drawings
Fig. 1 front side view of the embodiment of the present invention Fig. 2: 1111 view on the left
side of Fig. 1 Fig. 6: right side view of Fig. 1 [symbol] 1.2 ... oscillator, 6 .4.5.6: Surface electrode,
7: Backing, 8.9: Matching layer, 10: Acoustic lens,.
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