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JP2005303885

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DESCRIPTION JP2005303885
[Purpose] By providing an ultrasonic wave propagation body, the beam width in the twodimensional direction (longitudinal direction of the piezoelectric element) can be made to a
specified value at a predetermined distance, and the beam width can be reduced to obtain
sharpness and fidelity To provide an ultrasonic wave delivery system that is improved. An
ultrasonic beam transmitting apparatus comprising an ultrasonic beam which converges in a
binary direction from a front surface of a piezoelectric element group in which a plurality of
piezoelectric elements are arranged in a one-dimensional direction. An ultrasonic wave
propagation body is provided in which the width in the two-dimensional direction decreases
toward the tip end. [Selected figure] Figure 1
Ultrasonic beam delivery system
[0001]
The present invention relates to an ultrasound beam delivery apparatus (hereinafter referred to
as an ultrasound delivery apparatus) for delivering an ultrasound beam, and more particularly to
an ultrasound delivery apparatus for printing for destroying microcapsules containing a coloring
material.
[0002]
BACKGROUND OF THE INVENTION An ultrasonic probe is generally known as an ultrasonic wave
transmitting / receiving source used for medical ultrasonic diagnostic equipment and
nondestructive inspection equipment for the industrial industry.
03-05-2019
1
In recent years, in place of this type of ultrasonic probe, an ultrasonic transmission device that
generates a small diameter ultrasonic beam and destroys a minute object is required.
[0003]
(An example of the prior art) FIG. 3 (ab) is a view of an ultrasonic wave transmitting apparatus
based on an existing ultrasonic probe, wherein FIG. 3 (a) is a front sectional view and FIG. 3 (b) is
a side sectional view It is.
[0004]
The ultrasonic beam delivery apparatus is provided with an acoustic lens 2 in front of the
piezoelectric element group 1.
The piezoelectric element group 1 includes a plurality of piezoelectric elements 1a in a
rectangular shape having drive electrodes (not shown) on both main surfaces, and arranged in a
one-dimensional direction (the width direction of the piezoelectric elements 1a). In general, a
backing material 3 having a braking function is provided on the rear surface of the piezoelectric
element group 1. The acoustic lens 2 is a convex curved surface in the longitudinal direction of
the piezoelectric element 1a, and is made of, for example, a silicon-based resin that has a lower
sound velocity than the medium to which the ultrasonic waves are sent.
[0005]
In such a device, for example, with the ultrasonic wave delivery device fixed, the ultrasonic wave
P is delivered to the printing paper 4 moving up and down (left and right in the figure) as shown
in FIG. The printing paper 4 is coated with, for example, microcapsules containing a coloring
material (not shown). The ultrasonic waves transmitted from the piezoelectric element group 1
are focused by the acoustic lens 2 in the two-dimensional direction (column direction) by the
electronic scanning of the piezoelectric elements 1a in the one-dimensional direction (row
direction) and transmitted. . In short, in the collision surface with the printing paper 4, it becomes
an ultrasonic beam.
03-05-2019
2
[0006]
Then, the microcapsules responsive to the frequency of the ultrasonic waves are broken and
develop color, which is sequentially printed in the matrix direction. Unexamined-Japanese-Patent
No. 2004-45660
[0007]
(Problems of the Prior Art) However, in the ultrasonic transmission apparatus having the above
configuration, ultrasonic waves in one dimension direction can be focused in a point by the pitch
(arrangement interval) of the piezoelectric elements 1a or electronic scanning. The ultrasonic
waves in the above-mentioned problem have the problem that they can not be sufficiently
narrowed at the focal point of the beam width W (FIG. 4) due to the acoustic lens 2. In this case,
for example, unnecessary microcapsules are destroyed to reduce the sharpness.
[0008]
SUMMARY OF THE INVENTION It is an object of the present invention to provide an ultrasonic
wave transmitting apparatus which makes the beam width in a two-dimensional direction
(longitudinal direction of the piezoelectric element) a prescribed value at a predetermined
distance.
[0009]
According to the present invention, as described in the appended claims (claim 1), an ultrasonic
wave is generated by transmitting an ultrasonic wave which converges in two directions from the
front surface of a piezoelectric element group in which a plurality of piezoelectric elements are
arranged in one dimension. In the sound wave beam transmitting apparatus, an ultrasonic wave
propagation body is provided on the front surface of the piezoelectric element group so that the
width in the two-dimensional direction becomes smaller toward the tip side.
[0010]
With such a configuration, the beam width of the ultrasonic wave can be basically determined
depending on the width of the tip surface of the ultrasonic wave propagation body.
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3
Therefore, the beam width of ultrasonic waves can be reduced.
[0011]
FIG. 1 is a side cross-sectional view of an ultrasonic wave transmitting apparatus for explaining
an embodiment of the present invention.
The same parts as in the prior art example are given the same reference numerals, and the
description thereof is simplified or omitted.
[0012]
The ultrasonic beam delivery apparatus has the piezoelectric element group 1 in which the
plurality of piezoelectric elements 1a are arranged in a one-dimensional direction on the backing
material 3 as described above. And here, instead of the acoustic lens 2 described above, an
ultrasonic wave propagation body 5 is provided on the front surface of the piezoelectric element
group 1.
[0013]
The ultrasonic wave propagation body 5 is made of, for example, a material close to water with
little attenuation (propagation loss) of ultrasonic waves, and the cross section in the binary
direction is formed into a substantially isosceles triangle, and the width becomes smaller toward
the tip. In this example, the outer periphery of the ultrasonic wave propagation body 5 is, for
example, air having a different acoustic impedance. Then, the distal end surface of the ultrasonic
wave propagation body 5 is brought into close contact with the printing paper 4 to send out the
ultrasonic wave, and the microcapsules containing the coloring material are broken.
[0014]
With such a configuration, the ultrasonic wave P from the piezoelectric element 1a is reflected at
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4
the interface with air and travels through the ultrasonic wave propagation body. Then, it is
delivered to the printing paper 4 from the front end surface of the ultrasonic wave propagation
body 5. Therefore, the ultrasonic wave has a beam width W depending on the tip surface. As a
result, the beam width W can be made smaller as the width of the tip surface becomes narrower,
and the sharpness and fidelity become better.
[0015]
(Other matters) In the above embodiment, although the outer periphery of the ultrasonic wave
propagation body 5 is air, basically, it may be a material which is different in acoustic impedance
and reflects ultrasonic waves, and as shown in FIG. It is sufficient if there is a guide 6 for
reflection. In addition, although the ultrasonic wave propagation body 5 is made of a material
having little attenuation of the ultrasonic wave, it may be air, for example, because the driving
level may be increased. However, even in this case, the guide 6 for reflection is required.
[0016]
It is a sectional side view of the ultrasonic wave transmission device which explains one example
of the present invention. FIG. 7 is a side cross-sectional view of an ultrasonic wave delivery
device illustrating another embodiment of the present invention. It is a figure of the ultrasonic
transmission apparatus which demonstrates a prior art example, the figure (a) is a front sectional
view, and the figure (b) is a sectional side view. It is a sectional side view of the ultrasonic wave
transmission device which explains a prior art example.
Explanation of sign
[0017]
1 piezoelectric element group 1a piezoelectric element 2 acoustic lens 3 backing material 4
printing paper 5 ultrasonic wave propagation body 6 guide.
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5
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