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Description 1, title of the invention
High water pressure transducer
3. Detailed Description of the Invention The present invention relates to the structure of a
transducer using a cylindrical vibrator. Conventionally, as shown in FIG. 1, this type of transducer
has a structure in which the cylindrical vibrator 1 is supported by the end caps 3 and 4 via the
cushion 2 and the periphery is covered with the rubber boot 5. In order to prevent mechanical
connection between the cylindrical vibrator 1 and the end cap 3.4, a cork or the like having a
small acoustic impedance is used as the cushion 2. However, in the case of a transducer with
such a structure, the rubber boot 5 is pushed into the inside of the vibrator 1 under high water
pressure because the rubber boot 5 is inserted into the cork 2 used as a cussian so that the
rubber boot 5 is broken. There was a drawback to cause. In addition, if the thickness of the
cushion is reduced to reduce the amount of penetration of the rubber boot, the electrical
insulation is reduced, so that the effect of preventing dielectric breakdown and the coupling
vibration with the end cap is reduced. There is a disadvantage that performance can not be
obtained. An object of the present invention is to provide a high water pressure EndPage: 1
transducer that eliminates the above-mentioned drawbacks. That is, in the transducer according
to the present invention, in order to ensure electrical insulation, an insulating spacer having
water pressure resistance strength is inserted between the vibrator and the end cap, and a part of
the spacer is cut away to be thick. Using a cooker, while preventing coupling vibration with the
end cap, and by providing a minute gap between the vibrator and the spacer which is an
insulator, the penetration of rubber boots can be limited and it can be used even under high
water pressure It is a structure. Next, one embodiment of the present invention will be described
with reference to FIG. In the transducer according to the present invention, an insulator spacer
10 for maintaining water pressure resistance and electrical insulation is provided between the
cylindrical vibrator 1 and the end cap 2, and a part of the spacer 10 is cut out to end The cushion
2 for preventing coupling vibration with the cap 3.4 is inserted into the notch 10 'of the spacer
and covered with the rubber boot 5. The feature of this structure is that a notch 10 'is provided
in the spacer 10 and a cook 1 is fitted in the notch. In this structure, by setting the relationship
between the depth l of the notch 10 'and the thickness t of the cushion to t> l, the micro-lit gap
20 of any dimension is made between the vibrator 1 and the spacer 10. As it is possible to make,
it is possible to control the penetration of the rubber boot by water pressure and to prevent the
vibration transmitted from the vibrator 1 to the end cap 3.4 via the spacer 10 by having one gap.
can do.
Further, by providing the support 11 against the water pressure in the direction to compress the
cushion 2, it is possible to prevent the cushion 2 from being compressed by the water pressure
and thereby reducing the effect of preventing the joint vibration. The invention is effective. It is
not necessary for the support 11 to be an insulator in particular, as long as the water pressure
resistance can be secured. Although the above description is based on the structure in which the
insulating spacer 10 is provided with a notch, the gap 20 can be relatively large when the water
pressure is relatively low, so the insulator need not necessarily be used. The end cap 3, 4 may be
provided with a notch 10 ′ to insert the cushion 2. Although the transmission of the electrical
signal is performed using a watertight cable, it is omitted in the figure. Further, the same effect
can be obtained even when the vibrator 1 is not a cylindrical type but a polygonal type vibrator.
As described above, according to the present invention, a transducer excellent in characteristics
up to high water pressure, in particular, a high water pressure wave transmitter to which high
voltage is applied can be obtained.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of a conventional cylindrical
transducer, and FIG. 2 is a cross-sectional view of a transducer according to the present
invention. 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · spacer 10 ′
························ Clearance; 5−EndPage: 2