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JPH0344200

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DESCRIPTION JPH0344200
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
bolted Langevin type ultrasonic transducer used as a high intensity ultrasonic wave source.
[Conventional art] Conventionally, in a bolt-clamped Langevin type vibrator, an electrode plate
provided between a metal block and a piezoelectric element and between a piezoelectric element
and a piezoelectric element is drawn out to connect a plurality of electrode plates on positive and
negative sides. Generally, the drive lead wire is bonded with solder or the like. [Problems to be
Solved by the Invention] However, when the bolt-clamped Langevin-type vibrator is incorporated
into various devices as a strong ultrasonic wave source, in the conventional bolt-clamped
Langevin-type vibrator, an electrode plate drawn out of the vibrator Determines the occupied
space, which is a major drawback for space saving and miniaturization. The present invention has
been made to solve the above-mentioned problems, and an object of the present invention is to
provide a bolted Langevin type ultrasonic transducer which is space-saving and miniaturized
when incorporated into various devices. [Means for Solving the Problems] In order to achieve this
object, the bolted Langevin type ultrasonic transducers of the present invention are each a
piezoelectric element. The electrode plate and metal block have one or more holes or notches,
and the drive lead wire sufficiently insulated is drawn out through the holes or notches provided
in the piezoelectric element, electrode plate, and metal block. . [Operation] In the present
invention having the above-described configuration, the electrode plate provided between the
metal block and the piezoelectric element and between the piezoelectric element and the
piezoelectric element is a hole or a notch space provided in the piezoelectric element and the
electrode plate A pair of positive and negative driving lead wires connected to the positive
electrode and the negative electrode are drawn through holes or notches provided in the metal
block. An embodiment of the present invention will now be described with reference to the
drawings. For comparison, FIG. 3 shows the structure of a general bolted Langevin type
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1
ultrasonic transducer. As is apparent from the drawing, the electrode plate for forming the
positive and negative electrodes is drawn out, and it is clearly understood that it is inconvenient
for space saving and miniaturization. An exemplary arrangement according to the invention is
shown in FIG. Through holes 10 are provided in the piezoelectric element 1, the electrode plate 2
and the backing plate metal block 3 as illustrated. The positive and negative electrode label wires
7 are bonded at the positions of the holes 10 provided in the electrode plate 2 using a method
such as soldering. The lead wires 7 are drawn through the through holes 10 provided in the
piezoelectric element 1 and the backing plate metal block 3. At this time, the insulation between
the lead wire 7 and the piezoelectric cable 1 and the backing plate metal block 3 is secured by
the installation of an insulating spacer, the filling of an insulating rubber, or the like.
In the figure, 4 is a nut, 5 is a bolt, 6 is a front metal block, and 8.9 is an insulator. An example of
the construction of yjet according to the present invention is shown in FIG. As shown, a notch 10
'is provided in the piezoelectric element 1 and the backing plate metal block 3, and the electrode
plate 2 is provided with a notch 10' and a projection 11 for electrode plate connection. The
electrode plate 2 which becomes positive and negative electrodes respectively at the electrode
plate connecting convex portion 11 is connected within the cutout space provided in the
piezoelectric element using a technique such as soldering, and a lead wire of the positive and
negative electrodes 7 are bonded using a technique such as soldering. The lead wire 7 is drawn
out through the notch space provided in the piezoelectric element 1 and the backing plate metal
block 3. At this time, the insulation between the lead wire 7 and the piezoelectric element 1 and
the backing plate metal block 3 is secured by a method such as filling the notch 10 'with an
insulating rubber. Although the two embodiments have been described above, for example, the
negative electrode side can be directly taken from the backing plate metal block, bolt, nut or the
like, and the position and shape of the hole and notch to be provided can be arbitrarily selected.
Needless to say. (Effects of the Invention) As is apparent from the above detailed description,
according to the present invention, the positive and negative electrodes are connected by the
holes or notches provided in the piezoelectric element, the electrode plate and the backing plate
metal. The drive lead wire for the negative electrode is a piezoelectric element or an electrode
plate. Since the insulation is secured and drawn through the holes or notches provided in the
backing plate metal block, a bolted Langevin type ultrasonic transducer suitable for space saving
and miniaturization can be obtained.
[0002]
Brief description of the drawings
[0003]
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2
1 to 2 show an embodiment embodying the present invention, and FIG. 1 is a view showing an
embodiment embodying the present invention, and FIG. 2 embodies the present invention FIG. 7
is a diagram showing another embodiment.
FIG. 3 is a view showing an example of the general configuration of a current bolted Langevin
type ultrasonic transducer. In the figure, 1 is a piezoelectric element, 2 is an electrode plate, 3 is
a metal block, 10 is a hole, 10 'is a notch, and 11 is a convex.
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