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JPS49128723

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DESCRIPTION JPS49128723
Title of the invention "MV5 card 11 ■ JP 49-128723 @ published Japan. (1974) 12. i0 ■
Japanese Patent Application No. 4g-40443. Description of the Invention The Ultrasonic Focusing
Device The Invention Title of the Invention Ultrasonic Focusing Device
Address Marunouchi, Chiyoda-ku, Tokyo-Chome No. 5 No. 1 Hitachi, Ltd. [Phase] Japan Patent
Office Open Patent Bulletin
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for
focusing an ultra-high frequency wave, and is configured by combining a transducer, a concave
reflecting mirror, and a complex solid complex reading lens. A sound wave emitted from a small
'aperture transducer can be converged by a large diameter acoustic lens to obtain a sufficiently
narrow sound beam. Composite solid state acoustic lenses, while known, are effective only for
plane waves and require large diameter transducers. Since the present invention uses a spherical
wave emitted from a small-aperture transducer from a reflector mirror as a large-aperture plane
wave, it has the advantage that small-bore tigers can also be used in Y-sa Have. Hereinafter, the
configuration of the present invention will be described using the drawings. FIG. 1 shows a crosssectional view of the ultrasonic focusing device of the present invention, which is six. The sound
wave 5 emitted from the sound source T is reflected by the reflecting mirror M and becomes a
plane wave, and then refracted by each part A and B% C of the compound lens, and the point C
on the X axis. Converge on The sound source T is a spherical shell oscillator and is in a vibrating
state. Is in the form of respiratory oscillation and forms a spherical wave. The reflective surface
of the reflective node M is a paraboloid of revolution, and the focal point of the paraboloid. A
sphere so that the center of curvature of the spherical shell oscillator is located at point P. Install
a shell oscillator. The acoustic lens has a large effective aperture. As a thin compound lens as a
whole in order to make it clear. It is configured. Hl is a vibrator, 112 is a reflecting mirror. And
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an acoustic lens. For example, if sound ray 1 is transmitted through lens A and refracted at O □
0 plane and intersected at point 0, sound ray Z is refracted at B lens S10τ plane and O Parallel
to □ 9 (After becoming C5, it is refracted on the 0 □ 02 plane and intersects the 0 point.
Similarly, the ray 3 is refracted in the plane S, O, and after being refracted by the plane 90208
parallel to 02c and 2 ° EndPage: 1 after being refracted in the plane, it intersects at the point C.
By setting the thickness of the A% B% C lens to an appropriate value, it is possible to make the
phases of the sound waves emitted from the A and 8% C lenses coincide with each other at a
certain wavelength. The sound wave emitted from the sound source is converged through such a
trap. By using a compound lens, it is possible to make the F number (focal length / lens effective
aperture) about 1. In addition, an acoustic transmission body is inserted between the reflection
and the lens. Next, it is possible to configure a convergence device even in the case of using a flat
transducer, instead of using a spherical shell transducer as a sound source. The principle will be
described below with reference to FIG. The plane wave 4 radiated from the plane vibration
element T 'is converted to a spherical wave by the reflection plate M' and is incident on the
complex acoustic lens.
According to this method, although the number of reflecting mirrors is increased by one, it has
an advantage that a plane oscillator can be used. Next, although it has been described above that
the tumbling wave propagation liquid is contained between the reflecting mirror and the lens, the
following effects are exhibited by enclosing the scatterer having a high acoustic refractive index.
The material of the solid lens is plastic such as acrylic and styrene. The refractive index is smaller
than l. Here, the refractive index of water is 1. Therefore, the liquid to be enclosed is refracted
more than one. If the liquid has a ratio, the boundary between this liquid and the lens. The
relative refractive index at the interface is large. This is a B lens S □ 0; a plane, a C lens s, o; It
will reduce the inclination angle of the plane, B lens ". The opening of the C lens can be made
white. Thus, the effective aperture of the entire compound lens can be easily configured as a doglike, F / 1 focusing system. Next, embodiments of the present invention will be described. The
focal length OC of the compound lens is 20 cm, and the lens diameter is 24 crn. The sound
source is a spherical shell oscillator with a hollow radius of 1.5 and a resonance frequency of 2
MHz. In order to irradiate the spherical shell vibration, two vibrators are joined to form a sphere,
and the spherical shell portion which irradiates other than the reflection mirror surface is cut off.
The parabolic mirror has an effective diameter of 24 cm. For the constituent material, the
acoustic lens is polymethyl methacrylate, and the parabolic mirror is true cast. The liquid
enclosed between the lens and the reflector is Fluorinert FC-43, the property obtained with a
configuration of 0 or more, the refractive index to water being 2.1, is a focal point in water at 2
MH 2 frequency The beam width of the beam was IIIII ++ 8 degrees. In this way, a small aperture
mover, reflector, composite
BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view of the ultrasound
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focusing device of the brief description of the drawings. T: vibrator, M: reflecting mirror, A, B, O:
solid acoustic lens. Agent patent attorney thin ... separate room. EndPage: List of documents
attached to (2) documents ,! 1 1 (2) Drawing 1 (3) Commissioner 'f-like direct (4) patent
application deputy 4: 1 other than the above -1-2- "" 49 procedure correction book Showa 4 90
90 Showa 4t? Year Patent Application No. y0 Gug No. 2, Name of Invention Ultrasonic Focusing
Device 2, Name of Invention Ultrasonic Focusing Device 3, Relationship with Persons Who Make
Corrections Patent Applicant Address Chiyoda Ward, Tokyo Inner 5-1 of Marunouchi No. Name
(510) Hitachi, Ltd. 6, the number 07 ° correction target specification full-text full-text correction
specification 1, invention title ultrasonic focusing device 1, title ultrasonic focusing device
Address Marunouchi, Chiyoda-ku, Tokyo-Chome No. 5 No. 1 Hitachi, Ltd. [Phase] Japan Patent
Office Open Patent Bulletin
3. Detailed Description of the Invention The present invention relates to an apparatus for
focusing ultrasonic waves, which comprises a combination of a transducer, a concave reflector,
and a Fresnel solid acoustic lens. A sound wave emitted from a small diameter transducer can be
focused by a large diameter acoustic lens to obtain a sufficiently narrow sound beam. Although
Fresnel type solid acoustic lenses are known, they are effective only for plane waves and require
large diameter transducers. EndPage: 3 The present invention uses a reflecting mirror to convert
a spherical wave emitted from a small aperture transducer into a large aperture plane wave, and
has the advantage that it can be used in a small aperture transducer. Hereinafter, the
configuration of the present invention will be described using the drawings. FIG. 1 shows a crosssectional view of an embodiment of an ultrasound focusing device according to the invention.
The ultrasonic wave emitted from the sound source T is reflected by the reflecting mirror M and
becomes a plane wave, and is refracted by the lens portions A, B and C of the Fresnel type solid
acoustic lens and converges to the zero point on the X axis . Here, the sound source T is a
spherical shell transducer, the vibration posture is in the form of respiratory vibration, and the
ultrasonic waves transmitted from this form a spherical wave. The reflecting surface of the
reflecting mirror M is a paraboloid of revolution, and the spherical shell oscillator is installed so
that its center of curvature is located at the focal point P of the paraboloid of revolution. As
described above, the solid acoustic lens used for this purpose is configured as a thin Fresnel lens
as described above in order to increase the effective aperture. Note that H □ is a supporting
device of the vibrator, H2 is a state in which the ultrasonic waves of the reflecting mirror and the
acoustic lens are converged, for example, after the sound ray 1 passes through the central A lens
portion of the Fresnel solid acoustic lens If it refracts at the 0 surface and intersects at the 0
point, the sound ray 2 is refracted at the next ring-shaped B lens S and q surface and becomes
parallel to the OIC, and then is refracted at the O processing 0 □ surface, 0 Cross the points.
Similarly, the sound ray 3 is refracted at the 8202 plane, becomes parallel to -Q 2 C, is refracted
at the 0203 plane, and intersects at 0 point. In this case, if the thicknesses of the A, B, C, and lens
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portions are set to appropriate values, the phases of the ultrasonic waves emitted from the A, B,
and C lens portions are mutually It can be matched. The ultrasonic waves emitted from the sound
source are converged through the process described above. As described above, it is possible to
make the F value (focal length / 1 / 1s effective aperture) about 1 by using the Fresnel type solid
body acoustic lens. -A liquid as a sound wave propagation medium described later is contained
between the reflecting mirror and the lens.
Next, the ultrasonic wave focusing device can be configured even in the case of using a plane
vibration ′ ′ moving element without using a spherical shell transducer as a sound source. The
principle will be described below with reference to FIG. The plane wave 4 emitted from the plane
oscillator T 'becomes a spherical wave by the convex reflecting mirror M' and enters the Fresnel
solid acoustic lens. According to this method, although the number of reflecting mirrors is
increased by one, it has an advantage that a planar vibrator can be used. Next, as described
above, a liquid as a sound wave propagation medium is contained between the reflector and the
lens, but by using a liquid with a high sound wave refractive index, the following effects can be
obtained. Show. That is, acrylic is the material of Fresnel type solid acoustic lens. Although a
plastic such as polystyrene is used, its refractive index is smaller than 1. Here, the refractive
index of water is 1. Therefore, if the liquid to be enclosed is a liquid having a refractive index
greater than 1, the relative refractive index at the interface between the liquid and the acoustic
lens becomes large. This means that the inclination angles of the 8101 surface of the B lens unit
and the 820 1 2 surface of the C lens unit can be reduced, and the apertures of the B lens and
the C lens can be enlarged. In this way, the effective aperture of the entire Fresnel type lens in
which each lens portion is combined becomes large, and an ultrasonic focusing system of about F
/ l can be easily configured. Next, an actual numerical value of the present invention will be
described. In FIG. 1, the focal length OC of the Fresnel type solid acoustic lens is 20 cjn, and the
lens diameter is 24 (7). The sound source is a spherical shell oscillator with a curvature radius of
1.5 (1) and a resonance frequency of 2 MHz. In addition, two hemispherical vibrators are joined
to form a spherical shape so that the spherical wave radiated from the spherical shell oscillator
effectively irradiates the entire surface of the reflecting mirror, and other than the reflecting
mirror surface among the spherical oscillators. Cut and remove the spherical shell part that
irradiates. The paraboloid that forms the reflecting surface of the reflecting mirror has an
effective diameter of 24 cIn. The material of these components is polymethyl methacrylate,
which is a Fresnel type solid acoustic lens, and brass, which is a parabolic mirror. The liquid
enclosed between the lens and the reflector is Fluorinert FC-43, which has an acoustic refractive
index to water of 2.1. EndPage: With the ultrasonic focusing device having a configuration of 4 or
more, the beam width of the focal point in water at a frequency of 2 MHz was about IH, and
excellent characteristics could be obtained. In this way, narrow beam width convergence
characteristics can be obtained by using the small-aperture vibrator 1 reflector and the Fresnel
solid-state acoustic lens.
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Although the above description has been made of the case where a Fresnel solid acoustic lens is
used as the acoustic lens, it is acceptable to use a normal acoustic lens as well as the fresnel
acoustic lens if a drop in the convergence characteristic is acceptable. The same effect can be
obtained.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of an embodiment of an
ultrasonic focusing device 9 using a spherical shell transducer, and FIG. 2 is a cross-sectional
view of an embodiment using a flat transducer. . 1, 2, 3: Sound ray, 4: Plane-plane wave, A, B, C:
Lens parts of Fresnel type solid acoustic lens M, M ': Reflecting mirror, T, T': Vibrator (Sound
EndPage: 5
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