JPS62152297

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DESCRIPTION JPS62152297
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic probe for transmitting and receiving ultrasonic waves and a method of manufacturing
the same. [Technical Background of the Invention and Problems Thereof] A common ground wire
is used for grounding an ultrasonic probe formed by arranging a plurality of ultrasonic
transducers (hereinafter referred to as transducers) in an array. In recent years, in order to
prevent crosstalk between channels, a predetermined number of vibrators are divided into a
plurality of grounds as one set, and ground extraction is performed by a plurality of lead wires.
Has been tried. This is called earth division. However, in the earth division, since the number of
lead wires for grounding is increased, it takes time and effort in manufacturing, and there is a
problem that productivity can not be improved and manufacturing cost can not be reduced. In
addition, since the lead wire for ground extraction is usually treated as an east line, it lacks
flexibility, making it difficult to draw it in a desired direction, and an excessive force is likely to
be applied to the extraction location, which also causes problems in reliability. It becomes. In the
case of a convex or concave ultrasonic probe, in particular, it is extremely difficult technically to
pull out the ground in the ground division because the array surface of the plurality of
transducers is curved in a convex or concave shape. Improvement is strongly desired. SUMMARY
OF THE INVENTION The present invention has been made in view of the above circumstances,
and the object of the present invention is to provide a highly reliable ultrasonic wave capable of
performing the earth extraction in the earth division easily and appropriately. It is in providing a
probe, and also providing the manufacturing method which can aim at the improvement of
productivity of the ultrasonic probe, and the fall of manufacturing cost. SUMMARY OF THE
INVENTION The present invention applies a flexible printed circuit board having a plurality of
earth lines corresponding to the number of divisions of earth electrodes and providing a flexible
printed board so that the earth can be extracted. The reliability is improved by performing
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extraction easily and appropriately, and when manufacturing such an ultrasonic probe, a short
circuit portion shorting the ground lines in the printed circuit board is obtained before cutting.
The vibrator v1 is connected, the thin backing material is connected in advance, the thin backing
material is temporarily fixed to a fixing jig, and in this state, the vibrator is cut into an array at a
predetermined pitch. By cutting the short circuit portion of the printed circuit board at each
earth line, the productivity of the ultrasonic probe is improved and the manufacturing cost is
reduced.
The present invention will be described in more detail by way of the following examples. FIG. 1 is
an explanatory view showing the structure of an ultrasonic probe according to an embodiment of
the first invention, and ▪ indicates a thin backing material curved at a predetermined radius of
curvature, and 2 indicates the thin backing material l. A plurality of transducers arranged in an
array on the front surface, 3 is a thick banking material formed in a half moon shape and fixed to
the back of the thin backing material 1 It is a pass / fail matching layer fixed on the surface.
Reference numeral 5 denotes an earth lead member for dividing and extracting the ground
electrodes of the plurality of vibrators 2 into a plurality of sets of a predetermined number of
vibrators. A flexible printed circuit board (flexible printed circuit board: abbreviated as FPC)
having a plurality of earth lines EL corresponding to the number of divisions of the earth
electrode and having flexibility is applied to the earth drawing member 5. It is a feature of this
embodiment. One end of the ground line EL is connected to the ground electrode of a
corresponding predetermined number of vibrators, and the other end is formed in a ring shape
so that a connector or the like can be attached. Although the earth extraction member 5 is
separated for each earth line, it is desirable to fix the portion polymerized on the thick banking
material 3 with an adhesive. The FPC itself is known, and for example, the ground line EL is
formed of copper foil, and the ground line EL is insulated by covering it with a polyimide. The
FPC before assembly will be described in detail later. As described above, in the present
embodiment, since the FPC is applied as the ground drawing member 5, it is excellent in
flexibility and can be drawn in a desired direction, and an unreasonable force is applied to the
ground drawing portion. It is reliable because there is no Next, an embodiment of the second
invention manufacturing method will be described. FIG. 2 is a plan view of the ground lead-out
member (FPC) 5 before assembly. At one end of the FPC 5, there is formed a short circuiting
portion (sintering surface) 7 which shorts a plurality of ground lines, and the other end is radially
separated in advance. For example, perforations are provided to separate FPCs from one another
on each earth line El-. The vibrator (ceramic) 2 of the cut lI '+ j is connected to the short-circuit
portion 7 of the FPC 5 thus formed, and the backing material l of -W hand is connected to the
mud 1 and the I'JJ child 2. 3 and 4 are a plan view and a right side view showing the connection
state, respectively.
In FIG. 3, FIG. 4 and FIG. 4, reference numeral 8 denotes a hot side electrode lead-out member.
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The electrode lead-out member 8 has a plurality of electrode lines HL short-circuited by the short
circuit portion 11 as shown in the plan view of FIG. 5, and the end is separated for each of the
plurality of electrode lines HL. The same FPC as the ground lead-out member 5 is applied. 9 is a
separation line, for example, a perforation. The hot-side electrode lead-out member 8 largely
differs from the ground lead-out member 5 in that it has a large number of electrode lines
(copper 7t3) HL corresponding to the number of the arranged vibrators 2 cut. Next, the ground
lead-out member 5 and the hot-side electrode lead-out member 8 are bent 90 degrees toward the
thin backing material 1 side. Fig. 6 and Fig. 7 show the clasp after bending, and Fig. 6: from the
side of the ground lead out part A5. Arrows in Fig. 6: <Hello! , I +] saw more! . のである。 Then
the cutting edge f of the vibrator 2! 7) In this cutting step, a fixing jig 11 as shown in FIG. 8 is
used in this cutting step. Fixing / 1 tool 11: 3 having a hard rubber Ila formed in a rectangular
parallelepiped shape, and a reinforcing member with a rubber 11a5 and affixing 'J' for
reinforcing this rubber lla, for example, glass fffl 1 l b Become. The short side length β2 of the
glass plate 11b is slightly shorter than the short side length 11 of the rubber lla. The reason for
this is to prevent a dicer blade, which will be described later, from contacting the glass plate 11
b. Such a fixing jig 11 is temporarily fixed to the thin backing material l. This temporary fixing is
performed by bonding a thin banking material l with electron wax or the like on the surface of
the rubber lla opposite to the surface to which the glass plate 11b is bonded, as shown in FIG. As
the electron wax, for example, one which melts at about 70 ° C. is used. In this state, the
vibrator 2 is cut into a predetermined number of channels (for example, 128) by the dicer blade
I3. This cutting is performed corresponding to the arrangement pitch of the electrode lines HL of
the electrode drawing member 8 shown in FIG. 5, and the shorted portion 11 of the electrode
drawing member 8 and the shorted portion 7 of the ground drawing member 5 are
simultaneously cut. However, cutting of the short circuit portion 7 of the ground lead-out
member 5 is only a portion indicated by C3 in FIG. Therefore, the earth lines EL are still shortcircuited by the portion indicated by C2 (see FIG. 6). Thereafter, as shown in FIG. The Fi moving
element 2 and the fixing jig 11 are rotated by 90 ° so that the ground extraction member 5
faces the dicer blade 13.
Then, the C2 portion (see FIGS. 2 and 6) in the short circuit portion 7 of the ground lead-out
member 5 is cut by the dicer blade 13. This cutting is performed on the extension of the
separation line 6 of 7 trees, and the earth is divided into 8 by dust. In addition, the length 11 of
the short side of the glass plate 11b! Since 2 is slightly shortened, it is possible to prevent the tscar of the dicer blade 13 from being damaged. Next, the bonding portion between the thin
backing material 1 and the fixing jig 11 is heated to 70 ° C. or more to dissolve the electron
wax, and the thin backing material 1 and the fixing jig 11 are separated. Thereafter, the ground
lead-out member 5 and the hot side electrode lead-out member 8 are separated at a separation
line (for example, perforation) 6.9, and the thin backing material 1 is curved with a
predetermined radius of curvature, and FIG. As shown in FIG. 4, the matching layer 4 is fixed on
the surface of the vibrator 2 and the backing material 3 of 11 hands is fixed to the back surface
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of the thin backing material I. According to the above manufacturing process, by using the fixing
jig 11, the vibrator 2 and the ground lead-out portion + A5 can be easily and accurately cut.
Therefore, the ultrasonic probe shown in FIG. There is an advantage that it is possible to improve
the productivity and reduce the manufacturing cost. Further, since the fixing jig 11 is made of the
rubber 11a and the glass + N1tb, it can be obtained at low cost, and since it can be reused, it is
extremely economical. Then, by temporarily fixing the thin backing material l to the fixing jig 11
using, for example, electron wax which is dissolved at 70 ° C., the thin backing material 1 can be
smoothly attached and detached. There is also an advantage of. As mentioned above, although
one Example of 2nd invention was described, this invention is not limited to the said Example, It
can not be overemphasized that various deformation ¦ transformation implementation is possible.
For example, in the embodiment described above, the fixing member 11 is made of the rubber Ila
and the glass plate (reinforcing member) 11b, but the point is that it is a member that does not
damage the dicer blade I3 and has appropriate hardness. Of course, other than rubber and glass
plates are naturally applicable. As described above, according to the first aspect of the present
invention, a highly reliable ultrasonic probe can be provided since the ground can be extracted
easily and properly in the ground division. Further, according to the second aspect of the
invention, it is possible to provide a manufacturing method capable of improving the productivity
of the ultrasonic probe and reducing the manufacturing cost.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an explanatory view showing a configuration of an ultrasonic probe according to an
embodiment of the first invention, and FIGS. 2 to 10 are for explaining an embodiment of the
second invention, and FIG. The figure is a plan view of the ground lead member before assembly,
and FIGS. 3 and 4 are vibrators (ceramics) before cutting.
A plan view and a right side view showing the connection state of the ground lead-out member,
the phone 1-side electrode lead-out member, and the thin backing material, FIG. 5 is a plan view
of the hot side electrode lead-out member, and FIG. Fig. 7 is an explanatory view seen from the X
direction of Fig. 6, Fig. 8 is a perspective view of a fixing jig, Fig. 9 and Fig. 10 are cutting steps
of a vibrator etc. It is an explanatory view 1 ... thin backing material (backing material), 2 ...
vibrator, 5 ... earth extraction member, 7 ... short circuit part, 11 ... fixing jig, EL · · · · · Earth line.
Figure 4 Figure 5
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