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DESCRIPTION JP2002325296

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DESCRIPTION JP2002325296
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic probe as an industrial technical field, and in particular, to a variable type ultrasonic
probe capable of dividing a piezoelectric element in the width direction and switching focus in
the depth direction To be a variable type probe).
[0002]
BACKGROUND OF THE INVENTION An ultrasonic probe is used as an ultrasonic wave
transmitting and receiving unit of an ultrasonic diagnostic apparatus in medical and the like. One
of such devices is a variable probe which switches and uses the focal point in the depth direction
from the surface of a living body (subject).
[0003]
(An example of the prior art) FIG. 2 is a view of a variable probe for explaining an example of the
prior art. The variable type probe is formed by arranging piezoelectric elements 1 having
excitation electrodes on upper and lower surfaces on a backing material 2. The piezoelectric
element 1 is composed of a piezoelectric element 1 (abc) divided into three in the width direction.
For example, the flexible substrate 3 (abc) as an electrode lead-out substrate is attached to the
center and both sides of the piezoelectric plate, and the backing material 2 is formed by pouring
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resin or the like. Then, a cut that reaches the backing material 2 from above the piezoelectric
plate is provided, and cut in the length direction to be divided into a plurality of piezoelectric
elements 1. Next, the piezoelectric plate is divided into three in the width direction, and each
piezoelectric element 1 is divided into three piezoelectric elements 1 (abc) at both ends and in
the center.
[0004]
In such a device, three piezoelectric elements 1 (abc) divided in the width direction are driven in
common. Alternatively, the focal distance from the surface of the living body can be varied by
driving only the piezoelectric element 1b of only the central portion. However, when the three
piezoelectric elements 1 (abc) are simultaneously driven, the focal length is long, and when only
the central piezoelectric element 1b is short, the focal length is short.
[0005]
(Problems to be Solved by the Invention) (Problems of the Prior Art) However, in the variable
probe having the above configuration, the flexible substrate 3b is vertically connected to the
piezoelectric element 1b at the central portion to make the lower surface electrode To derive.
Therefore, as shown in FIG. 3, there is a problem that it is difficult to form the so-called convex
type by curving the piezoelectric elements 1 in a curved shape in the arrangement direction
(longitudinal direction).
[0006]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a variable
probe which is easily curved in a curved shape.
[0007]
According to the present invention, a lead-out substrate having conductive paths on both
principal surfaces is provided on the lower surface of the piezoelectric element at one end and at
the center, and the lower electrode of the piezoelectric element at one end is used as the lead-out
substrate. The solution is realized by leading the lower surface electrode of the piezoelectric
element at the central portion by the lower surface conductive path of the lead-out substrate.
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[0008]
In the present invention, since the lower surface electrode of the piezoelectric element 1 (abc) in
the central portion is derived by the lead-out substrate having conductive paths on both main
surfaces, it can be derived in the horizontal direction.
Therefore, it tends to curve in the longitudinal direction.
Hereinafter, one embodiment of the present invention will be described.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a view of a variable type probe for
explaining an embodiment of the present invention. The same reference numerals are given to
the same parts as in the prior art example and the description thereof will be simplified or
omitted. The variable type probe is formed by arranging the piezoelectric element 1 composed of
the piezoelectric element 1 (abc) on the backing material 2 as described above. And in this
example, the lower surface electrode of each piezoelectric element 1 (abc) is derived | led-out by
two flexible substrates 4 (ab).
[0010]
One side 4a of the flexible substrate 4 (ab) has a multilayer structure in which conductive paths 5
(ab) are formed on both sides. However, the conductive path 5b on the back surface of the
multilayer flexible substrate 4a extends to the surface by a through hole at the tip end side. Then,
the other side 4b of the flexible substrate 4 (ab) has a single layer structure having the
conductive path 5 on the upper surface as in the prior art.
[0011]
In such a device, first, a multilayer flexible substrate 4a is connected to one side of a piezoelectric
plate having electrodes on both main surfaces, and a single layer flexible substrate 4b is
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connected to the other side by a conductive adhesive, solder or the like. Next, as described above,
the piezoelectric plate is fixed on the backing material 2. Then, a cut that reaches the backing
material 2 from above the piezoelectric plate is provided, and cut in the length direction to be
divided into a plurality of piezoelectric elements 1.
[0012]
Next, each piezoelectric element 1 is divided into three in the width direction on the piezoelectric
plate to form a piezoelectric element 3 (abc). At this time, the piezoelectric element 1 is cut by
providing a cut reaching the multilayer flexible substrate 4 a on one side of the piezoelectric
element 1. On the other side of the piezoelectric element 1, a cut reaching the backing material 2
is provided to cut the piezoelectric element 1.
[0013]
With such a configuration, the lower surface electrodes of the piezoelectric elements 1a and 1b
at one side and at the center can be derived by the conductive paths 5 on the upper and lower
surfaces of the flexible substrate 4a as a multilayer. Then, the flexible substrate 4 (ab) is
horizontally derived from each piezoelectric element 1. Therefore, it is easy to bend each
piezoelectric element 1 in the arrangement direction, and a convex type ultrasonic probe can be
easily obtained.
[0014]
In the above embodiment, the multilayer flexible substrate 4a is provided only on one side of the
piezoelectric element 1 and divided into three. However, for example, the multilayer flexible
substrate 4a may be provided on both sides and divided into four. Further, by increasing the
number of laminated layers of the flexible substrate 4 from two layers to three or more layers, it
can be divided into five or more. Further, although the electrode lead-out substrate is a flexible
substrate, it may be, for example, a simple printed substrate in which a conductive path is formed
on a resin substrate.
[0015]
According to the present invention, a lead-out substrate having conductive paths on both main
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surfaces is provided on the lower surface of the piezoelectric element at one end and center, and
the lower surface electrode of the piezoelectric element at one end is by the upper surface
conductive path of the lead-out substrate. Since it derived | led-out and derived | led-out and the
lower surface electrode of the piezoelectric element of the said center part was derived | led-out
by the lower surface conductive path of the said derivation | leading-out board | substrate, the
variable type probe which is easy to curve in curved surface shape can be provided.
[0016]
Brief description of the drawings
[0017]
1 is a side view of a variable probe illustrating an embodiment of the present invention.
[0018]
2 is a partial view of a variable probe to explain the conventional example.
[0019]
3 is a front view of a convex type for explaining the conventional example.
[0020]
Explanation of sign
[0021]
1 piezoelectric element 2 backing material 3 4 flexible substrate 5 conductive path.
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