JP2674566B2 - Cylindrical transducer and method for manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical transducer for transmitting and receiving sound waves in water and a method for manufacturing the same, and more particularly to a transducer having a structure capable of uniformly radiating sound waves in a horizontal direction and having an easy manufacture. Regarding vessels.

[0002]

2. Description of the Related Art The structure of a conventional cylindrical transducer is shown in FIG. This cylindrical transducer includes a plurality of cylindrical active structures 1a, 1b, 1c, 1d that vibrate in a radial direction.
Are laminated and adhered via cylindrical spacers 2a, 2b, 2c, 2d, 2e, the inner surface electrode E1 and the outer surface electrode E2 are respectively connected to the oscillation circuit block 6 by the lead wires 3a, 3b, and the outer peripheral surface is rubber boot. It has a structure in which the upper and lower end portions of the cylinder are covered with a resin 5 and metal lids 4a and 4b are made watertight.

In this cylindrical transducer, when a voltage is applied from the oscillation circuit block 6 to the active structures 1a, 1b, 1c, 1d via the leads 3a, 3b, a diametrical expansion vibration is caused and the resin on the outer peripheral portion is vibrated. Sound waves are emitted into the water through 5.

[0004]

In the above-mentioned conventional transducer, the resin 5 on the outer peripheral portion and the active structures 1a, 1 are provided.
The contact surfaces with b, 1c and 1d are bonded, but when air bubbles remain in this bonding layer, the active structures 1a, 1b,
The radial expansion vibrations generated in 1c and 1d are not uniformly emitted as sound waves from the peripheral surface of the transducer. In particular, air bubbles tend to remain around the lead wire 3b connecting the outer surface electrodes E2 of the active structures 1a, 1b, 1c, 1d, and the radiation level in the direction in which the lead wire 3b is provided decreases.
As shown in FIG. 7C, the horizontal directivity is not uniform.
The figure (a) is a theoretical value.

The spacers 2a, 2b, 2c, 2d,
If the thickness of the adhesive layer changes depending on the amount of the adhesive applied when the spacers and the active structures 1a, 1b, 1c, 1d are alternately laminated and adhered, the active structures 1a, 1b may have different dimensional tolerances. , 1c, 1d are not arranged at regular intervals, and as shown in the lower side of FIG. 7C, there is a problem that the vertical directivity sub-pole level P1 becomes large or a singular point appears.

Also, the wiring of the lead wire 3b, the active structures 1a, 1b, 1c, 1d, the spacers 2a, 2b,
Since 2c, 2d, 2e and the resin 5 on the outer peripheral portion are bonded, there is a problem that the manufacturing process is complicated and the number of steps is increased.

In Japanese Laid-Open Utility Model Publication No. 63-114588, one electrode provided on the inner and outer surfaces of a cylindrical piezoelectric vibrator is divided into four equal parts in the circumferential direction to connect a signal lead wire, and directivity is set. Although an electroacoustic muffler capable of changing a pattern has been proposed, it is different from the one that seeks to improve horizontal and vertical directivity as in the present invention.

The present invention has been proposed in order to solve the problems of the prior art as described above. The directivity can be brought close to the theoretical value, the number of manufacturing steps can be simplified, and variations in manufacturing can be prevented. An object of the present invention is to provide a cylindrical transducer and a manufacturing method thereof.

[0009]

In order to achieve this object, a cylindrical transducer according to the present invention has at least one cylindrical active structure having a piezoelectric element and electrodes on the inner and outer peripheral surfaces thereof. The axes are aligned, the metal lids are placed on both ends of the arrayed cylinders, the inner surface electrodes of each active structure are mutually lead-wired, and this lead wiring is built in the inner periphery of the active structure. Connected to one end of the output of the oscillation circuit block, the other end of the output of this oscillation circuit block is connected to the lid, except the outer peripheral surface of the active structure,
Each active structure and between the active structure and the lid are molded with a resin that is watertight and has a hardness that is sufficient to support the active structure and that does not hinder vibration of the active structure.

Further, in the method for manufacturing a cylindrical transducer according to the present invention, the inner surface electrodes of each active structure are mutually connected to each other for at least one cylindrical active structure having electrodes on the inner and outer peripheral surfaces by using a piezoelectric element. The lead wire to the inner cylinder, and connect this lead wire to one end of the output of the oscillation circuit block built in the inner peripheral part of the inner cylinder, and between the inner jig and the cylindrical jig with the same inner diameter as the outer diameter of the active structure. , At least three resin pins are horizontally passed at equal angular intervals in the circumferential direction, and the active structures are sequentially arranged on the resin pins between the cylindrical jig and the inner cylinder at equal intervals in the cylindrical axial direction. A metal lid with the same outer diameter as the above is attached to both ends of the inner cylinder, and the other end of the output of the oscillation circuit block is connected to one lid to support the active structure that is watertight during curing. Is enough and A solution of resin having a hardness that does not hinder the vibration of the active structure is poured from the resin injection port provided on the outer periphery of the cylindrical jig into the inside, and after the resin is cured, the cylindrical jig is removed to remove the active structure. Except for the outer peripheral surface, the resin is molded between the active structures and between the active structure and the lid and inner cylinder.

[0011]

According to the above-mentioned structure, the outer electrode of the active structure need not be lead-wired and the outer peripheral portion of the wave transmitter / receiver need not be covered with resin. When the body expands in diameter and vibrates, sound waves can be uniformly radiated into the water, and horizontal directivity error can be reduced. In addition, since the active structures are arrayed by resin molding instead of arranging them in the axial direction of the cylinder using spacers, they are not affected by the dimensional tolerances of the spacers and the variations in the thickness of the adhesive layer, and thus are aligned vertically. The sex error can be reduced.

Further, in the above-mentioned manufacturing method, it is possible to carry out collective assembly by the resin mold, and it is possible to shorten the manufacturing man-hour,
Less variation during manufacturing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a longitudinal sectional view of an embodiment of the cylindrical wave transceiver according to the present invention, FIG. 2 is a plan view, and FIG. 3 is a transverse sectional view. As shown in these figures, electrodes E1 and E2 are provided on the inner and outer peripheral surfaces, and the polarization directions are the same (for example, the inner surface electrode E1 is a positive pole and the outer surface electrode E2 is a negative pole). In this embodiment, for example, four active structures 1a, 1b, 1c, 1d are arranged with their cylindrical axes aligned. The active structure is composed of piezoelectric elements. These active structures 1a,
The inner surface electrodes E1 of 1b, 1c and 1d are connected to each other by the lead wires 3
The inner surface electrode E1 is connected to one end of the output of the oscillation circuit block 6 installed on the inner peripheral portion of the inner cylinder 7 while being wired at a.

Also, metal lids 4a and 4b having the same outer diameter as the outer diameter of the active structure are provided at the upper and lower ends of the wave transmitter / receiver. Except for the outer peripheral surfaces of the active structures 1a, 1b, 1c, 1d, the active structures 1a, 1b, 1c, 1d.
There is watertightness between the active structure and the upper and lower lids 4a and 4b and between the inner cylinder 7.
A resin 10 such as urethane having a hardness sufficient to support a, 1b, 1c and 1d is poured and resin-molded. The other end of the output of the oscillator circuit block 6 is connected to the inner surface of the upper lid 4a.

In this cylindrical transducer, when the transducer is immersed in water, the other end of the output of the oscillation circuit block 6 connected to the metallic lid 4a is connected to the active structure 1 through water.
It has the same potential as the outer surface electrodes E2 of a, 1b, 1c, and 1d.
FIG. 4 shows a circuit diagram of this cylindrical transducer. In the figure,
6a is an oscillation source, 6b and 6d are coupling transformers, and 6c is an amplifier.

When the oscillator circuit block 6 is driven in a state where the cylindrical transducer is immersed in water, the active structure 1
A voltage is applied between the inner and outer electrodes E1, E2 of a, 1b, 1c, 1d, and the active structures 1a, 1b, 1c, 1d expand and vibrate, and sound waves are radiated into the water from the outer peripheral surface of the transducer. It

In such a cylindrical type transducer, since there is no influence of the resin or the lead wire which has conventionally coated the outer peripheral portion of the active structure, the horizontal directivity has a theoretical value as shown in FIG. 7B. A uniform circular shape similar to can be obtained. Also,
Since the active structures 1a, 1b, 1c, 1d are resin-molded, the active structures 1a, 1b, 1c,
1d can be arranged at equal intervals in the axial direction of the cylinder, and vertical directivity can obtain a pattern similar to the theoretical value.

Next, a method of manufacturing the above-mentioned cylindrical transducer will be described with reference to FIGS. First, a plurality (four in this embodiment) of active structures 1a, 1b, 1
The inner surface electrodes E1 of c and 1d are connected by the lead wire 3a, and the inner surface electrode E1 of the uppermost active structure 1a is connected to one end of the output of the oscillation circuit block 6 installed on the inner peripheral upper part of the inner cylinder 7a. Connect with.

Subsequently, the active structures 1a, 1b, 1
The active structure is installed on the resin pins 11 attached at least at three positions at equal angular intervals in the circumferential direction of the cylindrical jig 12 having the same inner diameter as the outer diameters of c and 1d and the inner cylinder 7. The resin pin 11 is made of the same material as the molding resin 10. After arranging the lower active structure, the resin pin 11 is inserted from the outer peripheral side of the jig 12 into the inner cylinder 7 and attached, and the upper active structure is sequentially installed. The holes into which the resin pins 11 are inserted are preliminarily provided with the jig 12 and the inner cylinder 7.
Has been drilled.

Subsequently, metal lids 4a, 4b having the same outer diameter as the outer diameters of the active structures 1a, 1b, 1c, 1d are attached to the upper and lower ends of the inner cylinder 7. At this time, the other end of the output of the oscillation circuit block 6 is connected to the upper lid 4a.

Subsequently, a solution of a resin such as urethane is poured between the cylindrical jig 12 and the inner cylinder 7 through a resin injection port 13 provided on the upper portion of the cylindrical jig 12.

After the injected resin 10 is cured, the cylindrical jig 12 is removed. As a result, the active structure 1
Except for the outer peripheral surfaces of a, 1b, 1c and 1d, resin 10 is provided between the active structures 1a, 1b, 1c and 1d, between the active structure and the upper and lower lids 4a and 4b and between the inner cylinders 7.
1 is molded into a completed state shown in FIG.

In the above-mentioned embodiment, the cylindrical transducer is formed by using the four active structures 1a, 1b, 1c, 1d, but the number of active structures is not limited.

[0024]

As described above, according to the present invention, the lead wire for connecting the outer surface electrode of the active structure is unnecessary, and the coating resin is not provided on the outer peripheral portion of the transducer. , Unlike the conventional case, there is no effect of air bubbles mixed in the coating resin on the outer peripheral portion, sound waves can be uniformly radiated into the water from the active structure over the entire circumference, and uniform directivity in the horizontal direction can be obtained. .

In addition, since the active structures which are positioned in the vertical direction in advance are molded by molding with a resin such as urethane, they are arrayed, the arrayed positions are at equal intervals, and there is no disturbance in the vertical polar sub-polar level. You can get sex.

Further, in the manufacturing method according to the present invention, the resin mold can be collectively assembled, and the wiring of the outer surface electrode of the active structure can be omitted. Therefore, the manufacturing process can be shortened, and the variation of the products at the time of manufacturing can be eliminated. The advantage is that

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a cylindrical transducer according to the present invention.

FIG. 2 is a plan view of the cylindrical transducer.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a circuit diagram of the cylindrical transducer.

FIG. 5 is a partially cutaway perspective view for explaining a method of manufacturing the cylindrical transducer.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

FIG. 7A is a pattern diagram showing theoretical values of horizontal and vertical directivities of a cylindrical transducer, and FIG. 7B is a pattern diagram showing horizontal and vertical directivities of a cylindrical transducer according to the present invention. (C) is a pattern diagram showing horizontal and vertical directivities of a conventional cylindrical transducer.

FIG. 8 is a vertical cross-sectional view showing a conventional cylindrical transducer.

[Explanation of symbols]

 1a, 1b, 1c, 1d Active structure 3a Lead wire 4a, 4b Lid 6 Oscillation circuit block 7 Inner cylinder 10 Resin 11 Resin pin 12 Cylindrical jig 13 Resin injection port E1 Inner surface electrode E2 Outer surface electrode

Claims (2)

(57) [Claims] 1. A cylindrical active structure having electrodes on its inner and outer peripheral surfaces using piezoelectric elements is arranged with at least one cylindrical axis aligned, and metal lids are arranged at both ends of the arranged cylinders. Then, the inner surface electrodes of each active structure are mutually lead-wired, and this lead wire is connected to one end of the output of the oscillation circuit block built in the inner periphery of the active structure, and the other end of the output of this oscillation circuit block is connected. To the lid, except for the outer peripheral surface of the active structure, between the active structures and between the active structure and the lid are watertight enough to support the active structure and of the active structure. A cylindrical transducer that is molded with a resin that does not interfere with vibration. 2. An inner surface electrode of each active structure is mutually lead-wired with respect to at least one cylindrical active structure having electrodes on the inner and outer peripheral surfaces using a piezoelectric element, and the lead wiring is used in the inner cylinder. Connected to one end of the output of the oscillation circuit block built in the peripheral part, and at least three resin pieces at equal angular intervals in the circumferential direction between the inner jig and the cylindrical jig having the same inner diameter as the outer diameter of the active structure. The pins are passed horizontally, the active structures are sequentially arranged on the resin pins between the cylindrical jig and the inner cylinder at equal intervals in the axial direction of the cylinder, and a metal lid with the same outer diameter as the active structure is placed. It is attached to both ends of the inner cylinder, and the other end of the output of the oscillation circuit block is connected to one lid, which is water-tight when curing and is sufficient to support the active structure and does not hinder the vibration of the active structure. Hardness resin solution , The active jig is removed from the active structure by pouring the resin from the resin injection port provided on the outer periphery of the cylindrical jig, and removing the cylindrical jig after the resin has hardened. A method of manufacturing a cylindrical transducer, comprising molding a resin between a body, a lid, and an inner cylinder.