JPH0640675B2 - Underwater receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wave receiver used in water, in particular, an underwater wave receiving device that obtains a wave receiving output by the sum of outputs of two diaphragms supported at both ends of a cylinder. Regarding vessels.

[Conventional technology]

2. Description of the Related Art Conventionally, in a wave receiver used in water, a vibration plate is supported at both ends of a cylinder, outputs of the pair of vibration plates are electrically connected in parallel or in series, and a sum of two outputs is received by the wave receiver. There is one that was output.

This structure is to reduce the sensitivity to vibration applied to the wave receiver (hereinafter referred to as acceleration sensitivity). More specifically, each of the two diaphragms has a piezoelectric electron attached thereto. The polarity of is set so that the phase of the output of the diaphragm is opposite to the vibration applied to the wave receiver (hereinafter referred to as acceleration), and the same phase to the acoustic signal. As a result, if the output amplitude of the diaphragm with respect to acceleration is the same, the output with respect to acceleration of the wave receiver becomes zero.

FIG. 3 is a waveform diagram showing the ideal operation of such a wave receiver. In the figure, 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 output of the diaphragm at both ends. Shows the output of the receiver.

(Problems to be Solved by the Invention) However, in the conventional technique, since the acceleration is reduced only by the phase of the output of the diaphragm, the variation in the characteristics of each piezoelectric material and the output amplitude due to the supporting state of the diaphragm are reduced. It is not possible to suppress the occurrence of the difference between the two, and therefore, the output waveform as shown in FIG. 4 is obtained with respect to the ideal output waveform shown in FIG. There was a problem that sensitivity could not be obtained.

The present invention has been made to solve such a problem, and provides a submersible wave receiver capable of adjusting a tightening torque for a diaphragm to obtain an acceleration sensitivity close to an ideal output waveform. The purpose is.

[Means for solving problems]

In order to achieve this object, the present invention supports two disc-shaped vibrating plates to which disc-shaped piezoelectric electrons are attached at both ends of a cylinder so as to oppose each other, and the two piezoelectric plates are taken out by the respective piezoelectric electrons. In an underwater receiver that obtains a received output by the sum of the outputs of the diaphragm, the diameter of the piezoelectric electrons is set to be smaller than the diameter of the diaphragm, and the piezoelectric electrons are concentrically attached to the diaphragm. The outer peripheral edge of the diaphragm is sandwiched between both ends of the ring and a ring, and a plurality of screws are passed through each ring, and each screw is tightened into a screw hole provided at each end of the cylinder. It is characterized in that it is supported at both ends of the cylinder and that the tightening torque of each screw with respect to the diaphragm is adjusted so that the output amplitudes of the both diaphragms become equal.

[Action]

According to the present invention having the above-mentioned configuration, the piezoelectric electrons are concentrically attached to the diaphragm at the time of assembling the underwater wave receiver, the outer peripheral edge portion of the diaphragm is sandwiched between both ends of the cylinder and the ring, and each ring is Through a plurality of screws, by tightening each screw into the screw holes provided at both ends of the cylinder, while supporting both the diaphragms at both ends of the cylinder, adjusting the tightening torque of each screw, The output amplitude of the diaphragm is made equal.

Further, not only at the time of assembly but also when the acceleration sensitivity is lowered, the tightening torque of each screw is adjusted so that the output amplitude of the diaphragm becomes equal.

〔Example〕

 Embodiments will be described below with reference to the drawings.

FIG. 1 is a side sectional view showing an embodiment of the present invention, and FIG. 2 is a front view of the same. In the drawing, 4 is a cylinder, 5a and 5b are diaphragms supported at both ends of the cylinder 4, and 6 is a diaphragm. The vibrating plates 5a, 5
Rings 7a and 7b for supporting b are the diaphragm 5
These are piezoelectric electrons attached to a and 5b.

Here, the diameters of the piezoelectric electrons 7a and 7b are respectively the vibration plates 5a and 5b.
It is set smaller than the diameter of b, and the piezoelectric 7
The a and 7b are concentrically attached to the vibrating plates 5a and 5b, and the outer peripheral edge portions of the vibrating plates 5a and 5b are sandwiched between both ends of the cylinder 4 and the ring 6.

The cylinder 4 is provided with six screw holes 8 in this embodiment, while the ring 6 is provided with screw through holes 9 corresponding to the screw holes 8.

Reference numeral 10 denotes a screw that is inserted into the screw through hole 9 and screwed into the screw hole 8 of the cylinder 4. The screw hole 8, the ring 6, the screw through hole 9 and the screw 10 have a tightening torque adjusting function. A fastening type support means having the same is configured.

In this embodiment, the outputs of the diaphragms 5a and 5b are connected in parallel, and the polarities of the piezoelectric electrons 7a and 7b are both negative on the surface to which the diaphragm is attached.

With the above configuration, at the time of assembly, the screw 10 is inserted from the outside of the ring 6 through the screw through hole 9 until it reaches the screw hole 8, and the screw 10 is tightened and fixed.

Then, one of the diaphragms, for example, the diaphragm 5a is supported 6
The tightening torque of the screws 10 is adjusted, the reference value of the output amplitude is set, and then the tightening torques of the six screws 10 that support the other diaphragm 5b are adjusted, and the output of the diaphragm 5b is adjusted. The amplitude is made equal to the output amplitude of the diaphragm 5a.

The relationship between tightening torque and output amplitude is 1 to 5 kg of tightening torque.
The change range of output amplitude is 4 to 1 with respect to the change of f ・ cm range.
It is about 0 dB.

Although the adjustment at the time of assembly has been described above, loosening or the like occurs in the tightening of the screw 10 thus set, and the vibration plate
If there is a difference between the output amplitudes of a and 5b, the above-described tightening torque adjustment work is performed at any time to correct it.

It should be noted that another phase difference can be considered as a difference between the outputs of the vibration plates 5a and 5b. However, since the phase difference can be regarded as a rigid cylinder, the phase of the output with respect to the acceleration is opposite and does not shift.
This also applies to the conventional example.

〔The invention's effect〕

As described above, in the present invention, the diameter of the piezoelectric electrons is set to be smaller than the diameter of the diaphragm, the piezoelectric electrons are concentrically attached to the diaphragm, and the diaphragm of the diaphragm is provided between both ends of the cylinder and the ring. While sandwiching the outer peripheral edge portion, passing a plurality of screws in each ring, by tightening each screw into a screw hole provided at both ends of the cylinder, while supporting both the diaphragms at both ends of the cylinder,
The tightening torque of each screw with respect to the diaphragm is adjusted so that the output amplitudes of the both diaphragms are equal.

Therefore, according to this, variations in the characteristics of each piezoelectric electron,
Generation of a difference in output amplitude due to the supporting state of the diaphragm is significantly suppressed, and an output waveform close to the ideal output waveform shown in FIG. 3 is obtained. The effect that a high-performance underwater receiver that can be applied to a configuration using a vibrator and has extremely low acceleration sensitivity can be realized can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a waveform diagram showing an ideal action common to a conventional example and this example, and FIG. 4 is a conventional example. FIG. 7 is a waveform chart showing the actual action of FIG. 4 ... Cylinder, 5a, 5b ... Vibration plate, 6 ... Ring, 7
a, 7b ... Piezoelectric, 8 ... Screw hole, 9 ... Screw through hole, 10 ... Screw

Claims (1)

[Claims] 1. A sum of outputs of both vibrating plates which are supported by two disc-shaped vibrating plates having disc-shaped piezoelectric electrons attached to opposite ends of a cylinder so as to oppose each other. In an underwater receiver that obtains a received output by, by setting the diameter of the piezoelectric electrons smaller than the diameter of the diaphragm,
The piezoelectric electrons are concentrically attached to the vibrating plate, the outer peripheral edge of the vibrating plate is sandwiched between both ends of the cylinder and a ring, a plurality of screws are passed through each ring, and each screw is attached to both ends of the cylinder. By supporting the both diaphragms at both ends of the cylinder by tightening the screw holes provided, it is possible to adjust the tightening torque of each screw to the diaphragm so that the output amplitudes of the both diaphragms become equal. Underwater wave receiver featuring.