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The present invention is used in connection with an ultrasonic diagnostic apparatus, for
transmitting ultrasonic waves to a subject, receiving reflected waves from the subject, converting
them into electrical signals, and applying them to the ultrasonic diagnostic apparatus. The
present invention relates to an ultrasonic probe. Conventionally, in order to enlarge a test area
with an ultrasonic diagnostic apparatus of IJ near electron travel fm, a probe full phase in which
a plurality of transducers are arranged to be a convex curved surface with respect to a subject It
is known that a tomogram having a radially expanded trapezoidal shape is obtained. FIG. 1 is a
block diagram of a main part showing an example of this type of ultrasonic probe. In the figure,
reference numeral 10 is an array transducer in which a plurality of narrators are arranged in a
convex shape, the I! A backing material 20 is bonded to the surface. The array transducer 10 is
energized by an ultrasound diagnostic device 1 (not shown) so that an IJ near electronic scan is
performed. In this case, the ultrasonic beam transmitted and received to and from the object 60
spreads in a trapezoidal shape in the object 30, and as a result, the area to be detected expands
to the aperture width of the transducer 10. However, when such an ultrasound probe is in
contact with a convex part such as the abdomen or flank of a pregnant woman or a part having a
hard surface, the adhesion is bad as shown in FIG. There is a drawback that a gaping person
occurs and as a result, the image is adversely affected. In order to eliminate such a defect and to
widen the radial scanning angle by a large angle, an acoustic lens is formed on the surface of the
transducer 10 so that the contact surface with the object is flat. Things are emerging. However,
in such a probe, although the adhesion to the object 60 is improved, the transmitted and received
ultrasonic beams are transmitted at both ends of the transducer because the acoustic lens has a
propagation loss. There is a problem that the transmission loss becomes large as it goes to the
part, and as a result, the image quality is deteriorated due to the decrease of the sensitivity and
the unevenness of the sensitivity. The object of the present invention is to provide an ultrasonic
beam capable of transmitting and receiving all ultrasonic beams in a radial manner, which has
good adhesion to a subject due to noodles and a simple structure. All probes are to be provided.
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG.
2 is a block diagram of an essential part showing an embodiment of the ultrasonic probe
according to the present invention. In FIG. 2, a fundamentally different point from FIG. 1 is that
the acoustic filler is joined to the surface of the transducer 100. That is, the transducer 10 and
the backing material 20 joined to each other are attached in a sealing manner in the hollow
container 40, and provided at the lower end of the casing 40 from the surface portion of the
transducer 10 The acoustic filler 41 is filled in a portion up to the positive open end.
For the filler of the present invention, a material with very low propagation loss, such as water, is
used. Therefore, the variation in the transmission loss due to the difference in the filler thickness
between the central portion and the end portion of the transducer 10 can be almost ignored. A
thin film 42 is attached to the lower end opening end of the housing 40 in a sealing manner. The
thin film 42 is a subject, that is, usually a human body, but is very close to or substantially the
same as the acoustic impedance (generally 1.5 to t, ax 10 'Kg / m 2 -s) of the human body, and
has a thickness Thin flexible films (films) are used. When such a thin film 42 is used, interface
surface reflection at the contact surface with the body surface can be reduced, and dense layers
can be easily and reliably formed even if the body surface has some irregularities. The shape of
the case 40 can be any shape. The material of the housing 40 can also be plastic or any other
appropriate material. As described above, according to the present invention, the simple
structure improves the adhesion to the subject, and the propagation loss between the transducer
and the body surface is reduced, and there is no variation due to the location, Furthermore, it is
possible to reduce the interface reflection on the contact surface with the living body, and realize
an ultrasonic probe capable of guaranteeing a good quality #J image, and the effect is large for
practical use.
Brief description of the drawings
FIG. 1 is a block diagram of a main part of a conventional ultrasonic probe, and FIG. 2 is a block
diagram showing an embodiment of the ultrasonic probe according to the present invention.
DESCRIPTION OF SYMBOLS 10 ... Array transducer, 20 ... backing material, 30 ... object, 4o ...
housing | casing, 41 ... sound filler, 42 ... thin film. 8す□′
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