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DESCRIPTION JPH01169382

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DESCRIPTION JPH01169382
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
elliptical-tube bending transducer for transmitting and receiving sound waves in water as an
electroacoustic transducer. [Description of the Related Art] A conventional elliptical-tube bending
transducer is available from Sanders, USA. This will be described with reference to FIGS. 5 to 7. In
the figure, reference numeral 1 denotes a hollow elliptical cylinder, and flat portions 13 are
provided at both ends of the major axis of the inner surface of the elliptic cylinder 1. A flange 10
is watertightly attached to both end openings of the oval cylinder 1 with a backing 11 interposed
therebetween, and an air chamber 12 is defined by the oval cylinder 1 and the flange 11.
Reference numeral 2 is a piezoelectric element group formed by bonding a plurality of
piezoelectric elements of zirconate and lead titanate-based ceramic to each other, and the
pressure of the element 1FF1 in the air chamber 12 is the length of the elliptic cylinder 1 It is
fixed in the long axis direction of the elliptic cylinder 1 so as to be orthogonal to the axis X. That
is, both ends of the piezoelectric element group 1, as well as the rust 30 and the spacer 31, are
firmly fixed to the flat portion 13 of the elliptic cylinder 1. Pressure 1! The element group 1 is
disposed in a plurality of stages up and down, for example, in two stages up and down, with
respect to the central axis of the elliptic cylinder 1. Leads: IfM 20 and e lead 21 are connected to
the piezoelectric element group 1 and the lead @ 20 and O lead 21 are pulled out from the air
chamber 12 through the flange 10 by the transmission cable 22. Thus, one vessel is put in water
(under water), and the pressure is applied to the element group 2. Then pressure! Due to the
electrostriction phenomenon of the element group 2, the piezoelectric element group 2 vibrates
in the long axis direction of the elliptic cylinder 1, the vibration is transmitted to the elliptic
cylinder 1, and the elliptic cylinder 1 vibrates in the short axis direction accordingly. In the
elliptical cylinder 1, the amplitude in the major axis direction and the vibration @S in the minor
axis direction are generated, and the sound wave is sent out into the water. When an acoustic
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wave from the water is received by the elliptic cylinder 1 in the reverse K direction, electric
output is generated in the transmission cable 22 through the piezoelectric element group 2. In
such a transducer, since the piezoelectric element group 2 is applied in advance in the direction
of the arrow A along the major axis direction X of the elliptic cylinder 1 since it is used at a low
frequency and a large output. It is necessary to prevent tensile stress from being applied to the
piezoelectric element group at the time of motion excitation. Further, both ends of the
piezoelectric element group 2 need to be completely in close contact with the flat portion 16 of
the inner surface of the elliptic cylinder 1. And the fixing means of the elliptic cylinder 1 and the
piezoelectric element group 2 in the above-mentioned conventional elliptic cylinder bending type
transducer. And a spacer 51 set on the flat portion 13 of the elliptical cylinder 1. The wedges 60
are inserted between the ends of the piezoelectric element group 20 in the direction of arrow B
to fix the piezoelectric element group 2 to the elliptical cylinder 1. However, since the abovementioned conventional elliptic cylinder bending transducer is used to fix the piezoelectric
element group 2 to the elliptic cylinder 1 by the wedge 30, it is necessary to drive a plurality of,
for example, four wedges 60 uniformly and simultaneously. There is.
For this purpose, it is technically difficult to drive a plurality of wedges 30 uniformly and
simultaneously, requiring high precision component dimensions, and also requiring expensive
equipment to insert the wedges 30 simultaneously and uniformly. . Further, an adhesive is used
to bring the piezoelectric element group 2 into close contact with the entire surface. For this
reason, when the wedge 30 is driven in and inserted, the compressive force may be relaxed and
become smaller due to the deformation of the adhesive. Thus, non-uniform compression forces
cause variations in acoustic performance. In addition, when the compression force is small, there
is a problem that a breakage accident due to a tensile force is likely to occur at the time of high
power transmission. Therefore, the present applicant has previously filed an elliptic cylinder
bending type transducer (Japanese Utility Model Application No. 57-160298) that solves the
above-mentioned problems. Hereinafter, this transducer will be described with reference to FIGS.
3 and 4. In the drawings, the same reference numerals as in FIGS. 5 to 7 denote the same
components. In the figure, 40 is a holding plate with a bolt. The bolted holding plate 40 is
electrically insulated and fixed (bonded) to both ends of the piezoelectric element group 2. The
nut 42 is screwed into the bolt 41 of the holding plate 40 with a bolt so that the nut 42 abuts on
the flat portion 13 of the elliptical cylinder 1. Reference numeral 14 is a 0 ring interposed
between the elliptic cylinder 1 and the flange 10, and 15 is a bolt for attaching a 7-range 10 to
the opening at both ends of the elliptic cylinder 1. In such a transducer, a uniform compressive
force A can be applied to the piezoelectric element group 2 by rotating the nut 42. [Problems to
be Solved by the Invention] However, the above-mentioned elliptical cylinder bending type
transducer is used for the pressure plate 40 with the bolt 41 and the bolt 41 of the pressure
plate 40 in the elliptic cylinder 1 (in the air chamber 12). Since the screwed nut 42 is disposed, a
uniform compressive force A can be applied to the piezoelectric element group 2, but when
adjusting the compressive force A, the 7 range 10 must be removed from the elliptical cylinder 1.
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There is a problem that the work is somewhat troublesome because it must be done. An object of
the present invention is to provide an elliptical-tube bending transducer capable of easily
adjusting the compression force. [Means for Solving the Problems] The present invention is
characterized in that the elliptical cylinder is provided with a bolt for adjusting the compressive
stress penetrating in the long axis direction of the elliptic cylinder. [Operation] According to the
present invention, the compression stress uniformly applied to the piezoelectric element group in
the elliptic cylinder from the outside of the elliptic cylinder simply by rotating the bolt by means
of the bolt provided penetrating in the long axis direction of the elliptic cylinder. Adjustments can
be made. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the
transducer according to the present invention will be described with reference to FIGS. 1 and 2.
FIG.
In the drawings, the same reference numerals as in FIGS. 6 to 7 denote the same components. In
the figure, reference numeral 50 denotes a compressive stress adjustment bolt, and reference
numeral 51 denotes a nut screwed into the bolt 50. A stepped through hole 16 is provided in the
major axis X direction of the elliptical cylinder 1 substantially in the middle of the central axis of
the elliptic cylinder 1. The through hole 16 has a large diameter portion on the outer side and a
small diameter portion on the inner side and a stepped portion in the middle portion. Thus, the
bolt 50 is passed through the elliptic cylinder 10 through hole 16 and the head of the bolt 500 is
brought into contact with the through hole 16 at the step. Screw the nut 51 into the bolt 50. The
nut 51 is applied to the through hole 160 step. The reference numeral 17 denotes an O-ring
interposed between the bolt 50 and the through hole 16 of the elliptic cylinder 1, and 23 denotes
a spacer interposed between the piezoelectric element group 2 and the flat portion 13 of the
elliptic cylinder 1. When the elliptical cylinder 1 is made of metal, an insulating spacer 23 is
used. The elliptical tube bending type transducer according to the present invention in this
embodiment is configured as one or more. Therefore, when the bolt 50 is turned in the direction
of arrow C from the outside of the elliptical tube 1, the bolts 50. The tightening force of the nut
51 acts uniformly as a compressive force A on the piezoelectric element group 1 via the step
portion of the through hole 16 of the elliptic cylinder 1 and the spacer 23. Therefore, the flange
is removed in comparison with the conventional elliptical cylinder bending type transducer in
which the bolted holding plate and the nut screwed into the bolt of the holding plate are disposed
in the oval cylinder 1. The adjustment operation of the compression force A of the piezoelectric
element group 2 is easy because there is no attachment. In particular, after the long-term use,
when the compression force A decreases, the bolt 50 can be tightened again, which is effective
for maintenance. [Effects of the Invention] As is apparent from the above, in the elliptical cylinder
bending transducer of the present invention, a bolt for compressive stress adjustment is provided
by penetrating the elliptical cylinder in the major axis direction of the elliptic cylinder. Thus, the
compressive force applied uniformly to the piezoelectric elements in the elliptical cylinder can be
adjusted by rotating the bolt from the outside of the elliptic cylinder. Therefore, the adjustment
of the compression force is simple as compared to the conventional one in which the flange is
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removed and the bolt is turned.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view showing an example of an elliptical tube bending amount
transducer according to the present invention, and FIG. 2 is an n-n1 sectional view in FIG.
FIG. 3 is a longitudinal sectional view of a bolted pressure plate and a nut-type conventional
elliptical cylinder bending transducer, and FIG. 4 is a sectional view taken along the line II--IV in
FIG. Fig. 5 is a longitudinal sectional view of a wedge type conventional elliptical cylinder
bending current transducer, Fig. 6 is a sectional view taken along vt--i in Fig. 5, and Fig. 7 is an
explanatory view showing a state in which the wedge is driven. is there. 1
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии и Stepped through hole 2 иииииииииииии Piezoelectric element group
20.21 иииииииииииииииииииииииииииии transmission cable 50 ........... - ... bolt 51 ............... nut + ? attorney Attorney
small river wins man ',. h ? ? 3 solid drawing clean 7 (no change to 1 и j) ? 4Z procedure
correction (type)% formula% title of the invention elliptic cylinder bend type transducer
correction person with f ?? patent application Person и и (The date of the ceremony is 5101.
The date of the correction of the date of correction. Date of March 29, 1988 (t it El) correction
target Figure 4 of the drawing
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