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JPS63232699

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DESCRIPTION JPS63232699
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
receiver used in water, and more particularly to a submersible receiver which obtains a receiver
output by the sum of the outputs of two diaphragms supported at both ends of a cylinder.
[Background Art] Conventionally, in a receiver used in water, a diaphragm is supported at both
ends of a cylinder, and the outputs of the pair of diaphragms are electrically connected in parallel
or in series, and two outputs are provided. There is one in which the sum of That is, this structure
is intended to reduce the sensitivity (hereinafter referred to as acceleration sensitivity) to the
vibration applied to the receiver, and in detail, piezoelectric electrons are attached to each of the
two diaphragms, and the pressure is reduced. The polarity of the electrons is set so that the
phase of the output of the diaphragm is opposite to that of the vibration (hereinafter referred to
as acceleration) applied to the receiver, and the phase is the same as that of the acoustic signal.
Thus, if the output amplitude of the diaphragm for the acceleration is the same, the output for
the acceleration of the receiver will be zero. Fig. 3 is a waveform diagram showing the ideal
operation of such a receiver, in which 1 is the output of the diaphragm at one end, 2 is the output
of the diaphragm at the other end, and 3 is the diaphragm of the both ends. The sum of outputs =
the output of the receiver. [Problems to be Solved by the Invention] However, the waveform as
shown in FIG. 3, that is, the effect that the output with respect to the acceleration of the wave
receiver becomes zero is the ideal, as described above. According to the prior art, the acceleration
sensitivity is reduced to a technically satisfactory level because the output amplitudes at both
ends have a slight difference depending on the variation of piezoelectric characteristics and the
support condition of the diaphragm. Instead, the actual action was as shown in FIG. The present
invention has been made in view of the above problems. However, by reducing the difference
between the output amplitudes of the diaphragms at both ends, it is possible to obtain a highly
reliable underwater wave receiver with reduced acceleration sensitivity. To aim. [Means for
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Solving the Problems] In order to achieve the above object, according to the present invention,
the tightening torques of the diaphragms at both ends can be adjusted separately at both ends,
and the difference in output amplitude can be eliminated as needed. Make it That is, according to
the present invention, in the underwater wave receiver which obtains the received wave output
by the sum of the outputs of the two diaphragms supported at both ends of the cylinder, the
respective supporting means of the diaphragms are each provided with independent tightening
torque adjustment functions. And a clamping type supporting means. [Operation] With the above
configuration, the present invention adjusts the tightening torque while attaching each
diaphragm by the clamping type supporting means, and makes the output amplitudes of two
diaphragms having different characteristics approach each other, and the difference is zero. Can
be closer to Furthermore, according to the present invention, when there is a deviation in the
output amplitudes of the two diaphragms, the attachment is not limited at times, and it is
possible to adjust and correct each tightening torque.
An embodiment will be described below with reference to the drawings. FIG. 1 is a side sectional
view showing one embodiment of the present invention, FIG. 5b is a diaphragm supported at
both ends of the cylinder 4; 6 is a ring for supporting the diaphragm 5a, 5b; 7a. Reference
numeral 7b denotes piezoelectric electrons attached to the diaphragms 5a and 5b. The cylinder 4
is provided with six screw holes 8 in the present embodiment, while the ring 6 is provided with
screw through holes 9 corresponding to the screw holes 8. 10 is a screw which is inserted into
the through hole 9 for screw and screwed into the screw hole 8 of the cylinder 4. The tightening
torque adjustment is performed by the screw hole 8, the ring 6, the through hole 9 for screw and
the screw 1o A clamping type supporting means having a function is configured. The outputs of
the diaphragms 5a and 5b are connected in parallel in this embodiment, and the polarities of the
piezoelectric electrons 7a and 7b are negative with respect to the adhesive surface with the
diaphragm. According to the above configuration, at the time of assembly, the screw 10 is
inserted to the screw hole 8 through the screw through hole 9 until it reaches the screw hole 8
from the outer side of the ring 6, and the screw is fixed. Subsequently, the tightening torques of
the six screws 10 supporting one diaphragm, for example, the diaphragm 5a, are adjusted, the
reference value of the output amplitude is set, and then the six diaphragms 5b are supported The
tightening torque of the screw 10 is adjusted to make the output amplitude of the diaphragm 5b
equal to the output amplitude of the diaphragm 5a. The relationship between the tightening
torque and the output amplitude is such that the change range of the output amplitude is about 4
to 10 dB with respect to the change of the tightening torque within the range of 1 to 5 kgf-m.
The adjustment at the time of assembly has been described above, but if tightening or the like
occurs when tightening the screw 10 set in this way and a difference occurs in the output
amplitude of the diaphragms 5a and 5b, the above-mentioned tightening torque adjustment Do
the work and correct this. Although another phase difference can be considered as the difference
between the outputs of the diaphragms 5a and 5b, since the phase difference can be regarded as
a rigid body of the cylinder, the phase of the output with respect to the acceleration does not
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have a phase difference. The same applies to the conventional example. [Effect of the Invention]
As described above in detail, according to the present invention, in the underwater receiver for
obtaining the receiving output by the sum of the outputs of the two diaphragms supported at
both ends of the cylinder, each of the diaphragms Since the support means is a tightening type
support means having an independent tightening torque adjustment function and the output
amplitudes of the diaphragms at both ends can be adjusted separately at both ends, adjustment
of the difference in output amplitude of the diaphragms at both ends is possible It becomes
possible. As a result, the difference between the output amplitudes of the diaphragms at both
ends can always be removed, and the highly reliable underwater wave receiver with reduced
acceleration sensitivity can be obtained by always holding the ideal waveform shown in FIG. It
has the effect of gaining.
[0002]
Brief description of the drawings
[0003]
1 is a side sectional view showing one embodiment of the present invention, FIG. 2 is a front view
thereof, FIG. 3 is a waveform diagram showing an ideal operation common to the prior art and
this embodiment, and FIG. 4 is a prior art It is a wave form diagram which shows the actual effect
of. .
DESCRIPTION OF SYMBOLS 4 ... Cylinder 5a, 5b ... Diaphragm 6 ... Ring 7a, 7b ... Piezoelectrics 8
... Screw hole 9 ... Through-hole for screw 10 ... Screw patent applicant Oki Industrial Co., Ltd.
Attorneys Patent Attorney Kanekura Shoko Side cross section sleeve 1 l @ 2 b
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