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DESCRIPTION JPH05284599

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DESCRIPTION JPH05284599
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transducer, and more particularly to a structure for preventing external noise such as
electromagnetic waves from intruding into an internal resonator.
[0002]
2. Description of the Related Art An ultrasonic transducer of this type is known to have a
structure as shown in FIG. In this ultrasonic transducer, for example, a disc-shaped resonator 2
smaller than the outer diameter of the matching layer 1 is bonded to the central portion of the
back surface of the insulating disc-shaped matching layer 1 such as epoxy, and the matching
layer A metal cylindrical tube (for example, made of aluminum) 3 having the same size as the
outer diameter of 1 is placed on the resonator 2 and the upper end surface of the metal
cylindrical tube 3 is bonded to the back surface of the matching layer. The positive electrode lead
wire 4 and the negative electrode lead wire 5 are drawn out from the lower surface (positive
electrode) and the upper surface (negative electrode) of the resonator 2, respectively. Further,
the negative electrode is electrically connected to the metal cylindrical tube 3 by the connecting
lead wire 6 to constitute a ground electrode.
[0003]
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1
In this ultrasonic transducer, since the front surface (the upper surface in the figure) of the
matching layer 1 is not shielded by the metal material, noise such as electromagnetic waves from
the outside penetrates to the resonator and the resonator There is a risk of disturbing the
received electrical signal obtained by converting the minute reflected wave received in the above.
An object of the present invention is, in view of the above-mentioned problems, to provide an
ultrasonic transducer having a structure in which noise such as electromagnetic waves from the
outside does not intrude from the front surface of the matching layer.
[0004]
SUMMARY OF THE INVENTION In the present invention, the back surface side central portion of
the matching layer is formed in a disc shape smaller than the outline of the disc shaped matching
layer so that external noise does not intrude from the front surface of the matching layer. And a
metal cylindrical tube provided on the back side of the matching layer so as to cover the
resonator with a cylindrical shape having the same diameter as the outer diameter of the
matching layer. A thin metal plate was attached to the matching layer in an ultrasonic transducer
which was constructed and from which the positive electrode and negative electrode lead wires
of the resonator were drawn out, and this was connected to the ground.
[0005]
Mounting of the thin metal plate is performed by embedding in the matching layer and
sandwiching in a sandwich, sticking to the back surface side of the matching layer, or covering
the upper end surface and the side peripheral surface of the matching layer, Connected to
[0006]
In the present invention, since the thin metal plate is attached to the front surface, the back
surface, or the middle layer of the matching layer and this is connected to the earth, the
resonator is shielded and noises such as electromagnetic waves from the outside come to the
earth It does not flow and invade inside.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a side sectional view of an
embodiment of the present invention.
In this embodiment, the thin metal plate 7 is inserted in the middle layer of the matching layer 1
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2
and sandwiched between them, and the peripheral end of the thin metal plate 7 and the outer
peripheral wall of the metal cylindrical tube 3 are connected by the lead wire 8 It is a thing.
[0008]
FIG. 2 is a side cross-sectional view of a second embodiment of the present invention, in which
the same reference numerals as in FIG.
In this embodiment, the thin metal plate 7 was placed between the back surface of the matching
layer 1 and the upper end surface of the metal cylindrical tube 3, and the thin metal plate 7 was
connected with the terminal of the negative electrode lead wire by the connecting lead wire 6.
If a conductive adhesive is used to bond the back surface of thin metal plate 7 to the upper end
surface of metal cylindrical tube 3, connection lead wire 6 conventionally used can be omitted
(metal cylindrical tube 3 is thin metal plate 7). Connected to the negative electrode lead wire 5).
[0009]
FIG. 3 shows a third embodiment of the present invention, in which the same reference numerals
as in FIG. 1 denote the same parts. In this embodiment, the thin metal plate 7 is mounted so as to
cover the upper end surface and the side peripheral surface of the matching layer 1. Then, the
side peripheral surface of the thin metal plate 7 and the outer peripheral wall of the metal
cylindrical tube 3 were connected by the connecting wire 8.
[0010]
According to the present invention, since the thin metal plate is attached to any one of the front
surface, the back surface, and the intermediate layer of the matching layer and this is connected
to the negative electrode, the resonator is in a shielding state. All noise flows to ground, and the
ultrasonic transducer always operates normally.
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