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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibration element, and more particularly to a vibration element characterized by a connecting
structure of a vibrator for a low frequency sound source used in water.
2. Description of the Related Art FIG. 3 is a schematic perspective view with a partial cross
section showing the structure of a vibration element of a conventional high power sound source.
FIG. 4 is an explanatory perspective view showing a state in which two of the divided
piezoelectric ceramic vibrators shown in FIG. 3 are not yet attached.
In both drawings, 31 is a piezoelectric ceramic vibrator, 32 is a glass fiber thread, 33 is an
electrode provided on the piezoelectric ceramic vibrator 31, and 34 is a lead wire of the electrode
33. As shown in FIG. 4, the piezoelectric ceramic vibrator 31 divides the cylindrical piezoelectric
ceramic into N equal parts (N ≧ 8) in the circumferential direction, and again brings the N equal
parts back to back with the same electrodes back to back. The electrode 33 is provided on the
divided surface in the form of an annular shape collected. The lead wires 34 are taken out from
the positive and negative poles, respectively, and voltage is applied between the lead wires 34 to
supply voltage to all the divided vibrators.
The vibrating element thus configured displaces between the electrodes 33 by applying a voltage
to the lead wire 34 connected to the electrodes 33. In this case, as shown in the figure, since the
piezoelectric ceramic vibrators 31 are arranged in a cylindrical shape of N pieces and firmly fixed
by the glass fiber yarn 32, the displacement in the circumferential direction due to the voltage
described above is Since all the transducers arranged on the circumference are performed, this
displacement is converted to a displacement in the diametrical direction. For this reason, by
applying an alternating voltage to the lead wire 34, the vibrator is caused to make a breathing
movement in the diametrical direction, and it is used as a vibration element of a high output
sound source (transmitter) using this .
In the conventional vibration element as described above, when the angle of the divided surface
forming the end face in the connecting direction of the divided piezoelectric vibrators is not
accurate, many piezoelectric vibrators are used. When combining the piezoelectric vibrators, the
contact surfaces of the piezoelectric vibrators are not parallel to each other, and therefore, those
which are in contact with each other at a line or a point also appear. When a large power is
applied through the lead wire in this state, there is a problem that the piezoelectric vibrator itself
is broken. Moreover, although it is not impossible to try to form the angle of the division plane
accurately, in this case, there has been a problem that it takes time and effort, which increases
the cost.
The present invention has been made to solve the above-mentioned problems, and it is possible
to connect a piezoelectric vibrator by using a connecting block whose angle of contact with the
divided surface of the piezoelectric vibrator is variable, and it is strong against a large output. It
is an object of the present invention to provide a vibrating element.
SUMMARY OF THE INVENTION In the vibration element according to the present invention, the
side surfaces of two substantially flat spacers are flat surfaces, and the back surfaces of the flat
surfaces are close to each other. A plurality of connection blocks which are arranged in a state
and which are composed of a combination block having a combination of angle adjustment
means provided with a mechanism for adjusting the angle of intersection of flat surfaces, and a
plurality of positive and negative electrodes disposed on both end faces in the connection
direction. The electrodes are connected in a back-to-back manner to a connecting block having
the above-mentioned angle of curvature as an apex angle, and are integrally connected in a ring
shape (cylinder). It is molded.
In the present invention, the vibrating element is formed by connecting the divided piezoelectric
vibrators in a cylindrical shape again, but at this time, an assembly of spacers provided between
adjacent end faces to which electrodes are added. Since the apex angle of the connection block
can be freely adjusted as the crossing angle formed by the outer flat surface according to the
surface angle formed by the end face of the vibrator, the stress applied to the piezoelectric
vibrator by the voltage application to the electrode is It will be received and transmitted by the
surface (flat surface outside the connection block).
For this reason, the surface area which receives stress becomes larger than before, and the
transmission of stress without loss becomes possible.
And the output increase according to the connection of the vibrator
view showing the basic structure of an embodiment of a vibration element according to the
present invention. 2 is an exploded perspective view showing the details of an example of the
connection block shown in FIG.
In FIG. 1, 11 is a piezoelectric vibrator having an electrode (not shown) provided on the end face
in the connecting direction, divided in substantially the same manner as in the conventional
example of FIG. The connection block is included for the purpose of describing the structure in
detail in the description of FIG. Further, reference numeral 13 denotes a glass fiber thread used
to fasten a plurality of piezoelectric vibrators 11 assembled in a ring shape at the outside of the
whole in order to fix and integrally form them. In the drawing, the lead wires and their
connections and the like are the same as the conventional example of FIG. 3 except that the
connecting block 12 is interposed, and therefore the illustration is omitted.
Referring to FIG. 2, the connection block 12 is a mechanical combination of approximately planar
plate-like members of a spacer A 21 and a spacer B 22 having the same planar area, but one side
of each spacer ) Indicate flat surface 21a and flat surface 22a, respectively. However, although
the notch part 30 is provided in each square at flat surface 22a, it can be regarded as a
substantially flat surface as a whole.
The mechanical combination of each spacer described above is carried out in such a manner that
the male adapter 25 provided on the back surface of the flat surface 21a and the female adapter
26 provided on the rear surface side of the flat surface 22a are loosely fitted. This is done by
inserting pin 23 into 28. However, also in this case, as in the above-mentioned loose fitting of the
adapter, it is slightly irregular, and the hole diameter of the pin hole 27 is larger than the hole
diameter of the pin hole 28. The male adapter 25 is formed in a semicylindrical shape, as seen in
the figure, in which the cylinder is cut in the longitudinal direction. Further, the female adapter
26 opposed to this is formed in a shape and position cut out in a mold shape in which the male
adapter 25 can substantially fit when the back surfaces of both adapters are in contact with each
Next, how to assemble the element shown in FIG. 1 will be described. First, with the male adapter
25 fitted to the female adapter 26 with the spacer A 21 and the spacer B 22 from the
arrangement position of FIG. 2, the pin 23 is inserted into the pin hole 28 and the pin hole 27
and connected. In this state, the adjusting bolt 24 is screwed into the screw hole 29 of the spacer
B22 so that the spacer A21 and the spacer B22 move slightly. In this state, the head of the
adjusting bolt 24 is accommodated in the inside of the notch 30, so that it can not be pulled out
of the flat surface 22a.
Next, as shown in FIG. 1, the glass fiber yarn 13 is wound around the piezoelectric vibrator 11 as
shown in FIG.
Then, since the connecting block 12 stops in surface contact with the piezoelectric vibrator 11,
the adjusting bolt 24 is tightened to mechanically stop the connecting block 12 from moving.
In this way, after fixing the connection block 12, the whole is further tightened with the glass
fiber yarn 13 with a predetermined compression force to complete the formation of the vibration
As described above in the embodiments, the present vibration element has a structure in which
the connection block having the angle adjusting means is provided between the plurality of
piezoelectric vibrators, and the whole is connected by tightening the glass fiber thread.
Therefore, surface contact is completely achieved between the connection end surface of the
piezoelectric vibrator and the flat surface located outside the connection block. このため。 Since
the stress received by the piezoelectric vibrator can be received on the surface, the piezoelectric
vibrator will not be broken even if the transmission force is increased. Therefore, since the
output loss is eliminated, it can be used as a vibrating element with higher output than before.
Needless to say, the means for adjusting the angle in the connection block according to the
present invention is not limited to the means of the embodiment.
As described above, according to the present invention, in the vibration element for low
frequency sound source, the connection block whose angle can be adjusted is provided between
the piezoelectric vibrators, and the whole is clamped with the glass fiber thread Because of this,
the contact between the end face of the piezoelectric vibrator and the contact surface of the
connecting block is improved, and the piezoelectric vibrator can receive the stress without fail.
Therefore, there is no risk that the piezoelectric vibrator will be destroyed even if the
transmission power is increased, and it is possible to output higher output.