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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a conventional
underwater ultrasonic wave receiver, and FIG. 2 is a diagram showing parts common to the
longitudinal cross section of the underwater ultrasonic wave transmitter and receiver of the
present invention with the same reference numerals. The 1 · · · · · · · · Piezoelectric element, 1a, · · ·
· · · · · · · · · · · · · · · · · · · Insulated wire, 3 · · · · · · · · · · · · · · · · · Insulating sheath, 4a · · · · · · · · · Bottom
cover, 4b · · · · · · · · base of large diameter · · · · · · · · · · protective tube portion, 5 · · · · · · · · · · · · · · · · ·
· · · · · · · · · ..... Airtight sealing material.
DETAILED DESCRIPTION OF THE INVENTION As shown in FIG. 1, a conventional underwater
ultrasonic transducer comprises a pair of electrode surfaces / a, / b formed by silver baking on
both surfaces, with insulation on both electrodes. Type (1), I! Lead zirconate zirconate based
piezoelectric element / and a 1% tir of the piezoelectric element l and a sponge resin covering the
upper surface, and a vibration absorbing material 3 such as cork, Similarly, a bottom cover 4 '6
joined with an electrode / b on the lower surface of the piezoelectric element by an adhesive, and
a large-sized base plate b closely fitted to the bottom cover and accommodating the piezoelectric
cable / and the motion absorbing material 3 Outer insulation l of synthetic resin consisting of a
small diameter storage section C extending from the base and loosely inserting the abovementioned insulated wire-. ! ! And a waterproof cap made of rubber, synthetic resin, etc., fitted in
the upper end of the holding tube and tightly fitted to the insulated wire core, and the electrode d
/ a, / b of the endogenous flll [l] is insulated in advance. Connect to 2-2a. After attaching the
piezoelectric element to the insulating cover * aμa at the electrode surface / b on the other side
with an adhesive, the outer surface and the upper surface of the piezoelectric element are
covered with iron film II to form a bottom. ≠ a fitted to this ■ 4 parts of the outer ring fit into
the b from brass tube section ≠ C! l!! Make a 鍬 Wi 匣 絶 縁 突出 突出 、 底 前 、 匣 嵌合 嵌
合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌
合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌
合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合 嵌合). キャップ! Is fitted to the upper end
of the holding cylinder portion of the insulating casing (:; The large diameter portion 4 of the
insulating jacket which becomes the wave portion (When b is allowed to travel in ice, the large
diameter portion receives a large water pressure and is bent with the fixing portion with the
medical support member H as a fulcrum and Since vibration is applied, the cap is loosened, and
as a result, seawater intrudes from between the insulated wire λ and the protective tube portion
c of the insulated jacket due to long-term use, and the insulation of the piezoelectric element l is
degraded. Nine. SUMMARY OF THE INVENTION The embodiment of FIG. 2 will be described
which has been rounded to eliminate the above-mentioned drawbacks. In the figure, 1 is a
piezoelectric element, 2 is an insulated wire connected to the electrode surface / a, / bK of the
both sides of the piezoelectric element, 3 is a vibration base material, 3 is a back cover, and a
large base is attached. The figure shows the waterproof cap inserted in the upper end of the
insulating tube consisting of the minimum holding + aW + part C, jFi and the holding cylinder
part C of the insulating cover, and the above configuration is the same as that of the 15th AK In
the present invention, the sealing material 6 represented from a soft elastic material such as
rubber is elastically formed at the end portion of the outer diameter direction of the insulated
wire core and the end of the inner diameter (j) surface of the insulation outer sheath It is
characterized by enclosing.
Thus, the new sealing material 1 is connected to the piezoelectric element l prior to bonding the
piezoelectric element l and assembling the back cover a of the insulating cover to the largediameter base sb of the insulating cover. The sealing material 6 is fixed to the insulating wire
core to be sealed by a water-resistant adhesive, while the inner cover of the protective cylindrical
portion #C of the insulating shell is the back cover 4 (a diameter of the insulating shell is also
large Assembling is made easy by providing a crotch seat ac + at the end portion of the fitting
portion which engages with the sealing material 4 at the base of the. In addition, the sealing
position of the sealing material crucible is as shown in the figure from the surface that maintains
the thickness of the holding cylinder unit aa near the end of the inner diameter surface that
contacts the vibration absorbing material J of the protective cylinder unit ≠ C of the insulating
outer cylinder as shown in a circle. Although it is preferable, the other side waterproof cap jOFilK
may be provided. As described above, the underwater ultrasonic transducer according to the
present invention has rubber, etc. for the outer diameter surface of the insulated wire connected
to the electrode surface of the piezoelectric element and the end portion of the inner diameter
surface of the insulation jacket encircling this. Excellent sealing effect by sealing the elastic
sealing material and keeping the liquid pipe firmly for 9 to 15 years of long-term use, eliminating
the accustomed insulation deterioration of the piezoelectric element due to the intrusion of
seawater or moisture .
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description, jps5617782
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