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JPH04185099

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DESCRIPTION JPH04185099
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
underwater receiver having an electroacoustic transducer in a case. (Prior Art) FIG. 1 shows an
example of a conventional underwater wave receiver. In the underwater wave receiver shown in
the figure, the cylindrical piezoelectrics 3 are concentrically attached to the outer peripheral
portion of the rod-like support structure 2 whose upper end is fixed at the center of the inner
surface of the lid plate 1 The upper end of the support structure 2 is fixed to the center of the
inner surface of the cover plate 1 by screwing or the like, and the cylindrical piezoelectric
electrons 3 are formed in the upper and lower annular shapes. It is fixed to the support structure
2 via the vibration isolation plate 8. The electrical output is derived from the cylindrical
piezoelectric 3 by a cable (not shown) passing through the cover plate 1. (Problems to be Solved
by the Invention) By the way, there are the following main conditions to be equipped with the
underwater wave receiver for measurement. (1) High delivery sensitivity (2) Flat response
sensitivity over a wide band (3) Non-directivity In the above conventional structure, the cover
plate 1, the support structure 2, the pressing plate The natural vibration such as 7 enters the
cylindrical piezoelectric electrons 3 through the vibration isolation plate 8 and has a drawback
that the characteristics of the underwater wave receiver are significantly deteriorated. In
particular, at deep depths, the anti-vibration effect of the anti-vibration plate 8 significantly
decreases with depth, resulting in an undesirable characteristic in use. It goes without saying that
it is a good measure in terms of measurement to receive underwater sound with a high sensitivity
underwater receiver, but in order to increase the delivery sensitivity, the conventional
underwater receiver shown in FIG. In this case, it becomes possible by adding one or more
cylindrical piezoelectric electrons in the longitudinal direction of the cylindrical piezoelectric
electrons 3 and electrically connecting each in series. However, due to the lengthening of the
whole, directivity is produced in a high frequency range and non-directivity can not be obtained.
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The present invention is intended to eliminate these drawbacks and to provide an underwater
receiver which has high delivery sensitivity, no directivity and flat delivery sensitivity frequency
characteristics over a wide band. (Means for Solving the Problems) Next, means for solving the
problems described above will be described with reference to FIG. 2 corresponding to the first
embodiment. That is, according to the present invention, a cylindrical piezoelectric (3), which is
an electroacoustic transducer, is provided via a buffer (6) having a buffer property in which an
insulating oil (4) is impregnated in a closed case (5). The present invention provides an
underwater wave receiver characterized in that a wave receiving sensor having a shape in which
a disk bulging electron (9) is attached to both end faces of is provided by a buffer structure.
(Embodiment) Hereinafter, an embodiment of the underwater wave receiver according to the
present invention will be described with reference to the drawings. 2 and 3 show a first
embodiment.
In FIG. 2, the wave receiving sensor of the underwater wave receiver has a disk bulging electron
9 having a receiving sensitivity Mo + on both end faces of a cylindrical piezoelectric 3 having a
delivery sensitivity MO yo in order to increase the sensitivity. It is a thing. As shown in FIG. 3, by
connecting the electrical outputs of each of the piezoelectric electrons in series, the delivery
sensitivity MO can be obtained by the sum of the cylindrical piezoelectric electrons and the two
disk bulging electrons. Mo = Mo + + Mow + MO + Here, in the case where the delivery sensitivity
of each piezoelectric electron is equal, three times the number of received waves of the
conventional underwater wave receiver (FIG. 1) in which the cylindrical piezoelectric 3 is one. It
becomes sensitivity. Further, since the thickness of the disk bulging electrons 9 is sufficiently
smaller than the height of the cylindrical piezoelectric electrons 3, the dimension in the length
direction of the sensing part does not become very large. Therefore, nondirectionality is
maintained up to a high frequency range. In the embodiment of the underwater wave receiver
shown in the figure, the inside of a closed case 5 made of rubber or other material is filled with a
foam 6 having a buffer property such as foam rubber, foam plastic, etc. A wave receiving sensor
as a sensing part of underwater sound, in which disc bulging electrons 9 are mounted on both
end faces of cylindrical piezoelectric electrons 3 and same piezoelectric electrons, is embedded
and foam 6 itself is used as a supporting structure Thus, the foam 6 is impregnated with the
insulating oil 4 to obtain a good acoustic medium. According to the configuration of the above
embodiment, the wave receiving sensor as an underwater sound sensing unit floats in the foam 6
and the insulating oil 4 and does not directly touch other solids, so the water wave receiving It is
not affected by vibration that deteriorates the characteristics of the device, and the broad band
reception sensitivity frequency characteristics are maintained. Figures 4A-F illustrate examples of
each. In the embodiment of FIGS. 4A and 4H, the disk bulging electrons 9a and 9b which are
slightly deformed are used as the wave receiving sensor. 4C, D, E, and F, through the diaphragm
10 at both end faces of the cylindrical piezoelectric electrons 3, the disk bulging electrons 9c, 9d,
9e, 9f as the wave receiving sensors. It is provided. In the embodiment of FIG. 4C, the diaphragm
10 may be absent. In the embodiment of the section 4A-F, the same reference numerals are
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attached to the same places as the embodiment of FIG. 2 and the detailed description thereof is
omitted. (Effects of the Invention) As described above, according to the present invention,
compared with the conventional underwater wave receiver, it has high sensitivity and delivers
nondirectionality and broad band delivery sensitivity frequency characteristics up to a high
frequency range. In addition to providing an underwater receiver in which the
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a schematic side sectional view of a conventional underwater wave receiver, FIG. 2 is a
side sectional schematic view showing a first embodiment of the underwater wave receiver
according to the present invention, and FIG. FIGS. 4A to 4F are schematic side sectional views of
the wave receiving sensor of the underwater wave receiving device according to another
embodiment.
DESCRIPTION OF SYMBOLS 1 ... Lid board, 2 ... Support structure, 3 ... Cylindrical piezoelectric, 4
... Insulation oil, 5 ... Case, 6 ... Foam, 7 ... Press board , 8: vibration isolation plate, 9: cylindrical
piezoelectric, 10: diaphragm. Patent Assignee Director, Technical Research Division, Defense
Agency, Ryozo Tsutsui Agent, Patent Attorney Manabu Nishimura Hikari Figure 1 Figure 2 Figure
3 Figure 41 (D) (F) (A)
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