JP3324541B2 - Cylindrical transmitter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroacoustic transducer that emits sound waves into water, and more particularly, to a cylindrical transmission device that emits sound waves using a respiratory vibration mode of a cylinder in which a plurality of vibrating elements are arranged in a cylindrical shape. About the vessel.

[0002]

2. Description of the Related Art Conventionally, this type of cylindrical transmitter has been disclosed, for example, in Japanese Utility Model Laid-Open No. 5-88094 or Japanese Patent Laid-Open No. 5-1499.
As disclosed in Japanese Patent Application Publication No. 8 (1999), a cylindrical transmitter is used for the purpose of efficiently emitting low-frequency sound waves by lowering the resonance frequency using a cylindrical respiratory vibration mode.

FIG. 5 is a schematic diagram showing an example of a conventional cylindrical transmitter. The conventional cylindrical transmitter includes one rectangular piezoelectric ceramics 11 and two connection fittings 1 as shown in FIG.
A plurality of drive units 14 each having a unit 2 are arranged in a cylindrical shape, and a bolt 13 is provided between each drive unit 14.
Are connected by bolts. The inner and outer circumferences of the cylindrical shape are water-tightly treated by rubber boots 16, and have an oil 15 inside covered by the rubber boots 16 on the inner and outer circumferences.

Next, the operation of the conventional cylindrical transmitter will be described. When an electric signal having the same frequency as the mechanical resonance frequency (fr) generated in the entire cylindrical shape is applied to the rectangular piezoelectric ceramics 11, a high-efficiency sound output is obtained by mechanical resonance in the respiratory vibration mode of the cylindrical transmitter. Can be. The mechanical resonance frequency (fr) indicates the sound speed of the drive unit 14 as C
And when the average radius of the cylindrical shape is d, approximately fr
≒ C / 2πd: expressed as Equation (1). Therefore, if the average radius d of the cylindrical shape is made sufficiently large, the mechanical resonance frequency can be lowered.

[0005]

A problem with the prior art described above is that the cylindrical transmitter is large and has poor storage. The reason is that when transmitting a low frequency with high transmission efficiency, it is necessary to increase the diameter and obtain a low mechanical resonance frequency in the respiratory vibration mode of the cylinder, and it is not possible to reduce the size and the storage is poor. was there.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cylindrical transmission device which can obtain a low mechanical resonance frequency in a respiratory vibration mode of a cylinder and obtain a high transmission drive efficiency while improving the storage capacity with a compact structure. It is to wave.

[0007]

SUMMARY OF THE INVENTION A cylindrical transmitter according to the present invention comprises a plurality of fan-shaped piezoelectric ceramics, which are alternately arranged on a circumference, and a hardening resin present in a rubber bag having a partition therebetween. The two-component curable resin before, a shape memory rigid ring that shrinks inside the cylindrical shape and changes to a large diameter due to heat, and a shape memory rigid ring that shrinks on the outer circumference and increases in accordance with the change in the overall shape It consists of a rigid ring that changes in diameter and a rubber boot that covers the whole. The shape changing force of the shape memory rigid ring that changes to a large diameter due to heat, and the curing of the two-component curable resin. There is provided a means of forming a cylindrical transmitter by being formed into a cylindrical shape by the action of a rigid ring on the outer periphery that presses the whole from the outer periphery.

According to the present invention, when not used, a two-part curable resin before curing present in a rubber bag having a partition, which constitutes a cylindrical transmitter when not in use, is shrunk into a cylindrical shape. The shape memory rigid ring that exists and changes to a large diameter due to heat, the rigid ring that exists in a contracted state on the outer circumference and changes to a large diameter according to the change in the overall shape, and the rubber boot that covers the whole are free shapes Can exist. Therefore, a large-diameter cylindrical transmitter capable of obtaining a low mechanical resonance frequency in a cylindrical respiratory vibration mode can be housed compactly in order to transmit a wave with high transmission efficiency.

[0009]

Next, embodiments of the present invention will be described in detail with reference to the drawings. Referring to FIG.
An embodiment of the present invention relates to a plurality of fan-shaped piezoelectric ceramics 1.
And a two-part curable resin 3 before curing that is present in a rubber bag 2 with a partition between a plurality of parts, and exists in a cylindrical shape inside in a contracted state like a spring, and changes to a large diameter due to heat. Shape memory rigid ring 4, a rigid ring 5 that exists in a contracted state like a spring on the outer periphery and changes to a large diameter according to a change in the overall shape, and a fixing metal 9 for positioning the shape memory rigid ring 4. And a rubber boot 6 covering the whole. Further, the rubber boot 6 may contain oil which is insulative and has good sound transmission.

As shown in FIG. 3, electrodes 10A and 10B having different polarities are provided on a plurality of piezoelectric ceramics 1, respectively.
Although the electrode 10A is not visible due to the figure, it is located on the side surface of the piezoelectric ceramics 1, and each of the electrodes is partially drawn to the inner peripheral side of the cylindrical shape. The electrode 10A of the adjacent piezoelectric ceramics 1 in FIG.
Are connected and electrically connected to each other with the same polarity by a lead 20B.
In B, these connected terminals are drawn out of the rubber boot 6.

As shown in FIG. 4, the rubber bag 2 having a partition therebetween is bonded to the adjacent piezoelectric ceramics 1 by an adhesive layer 50.
The partitioning of the curing agent 32 is performed by bonding with an adhesive layer 40 so as to connect the inner diameter side and the outer diameter side of the cylindrical transmitter. In addition, the adhesive force of the adhesive layer 40 is weaker than the tensile force of the shape memory rigid ring 4 at the time of shape deformation, and one of the partitioned bag rooms (for example, the portion where the hardener 32 is present)
The internal pressure of the partitioned bag is higher than that of the other room. When the adhesive layer 40 is peeled off and the main agent 31 and the hardener 32 constituting the two-component curable resin 3 are mixed and cured, a block 8 (FIG. 2) is formed. Main agent 3 constituting two-component curable resin 3
As the curing agent 1 and the curing agent 32, there is Araldite (registered trademark) adhesive sold by CIBA-GEIGY, and a room temperature curing type adhesive can be used.

The shape memory rigid ring 4 has a large diameter cylindrical shape stored in advance, and when stored, exists in a shape reduced like a spring by pre-processing (FIG. 1).
It is connected to the power supply 7 via the lead 21. In addition, the shape memory rigid ring 4 is made of a material that is electrically insulated and has a rigidity equivalent to that of the shape memory rigid ring 4 at one portion other than a portion reduced like a spring by pre-processing. The mechanical connection of the ring 4 is maintained and an electrically insulating part is formed.

The inside of the lead 21 has a paired wire structure divided into a positive electrode and a negative electrode. The positive electrode and the negative electrode are connected to both ends of an electrically insulated portion of the shape memory rigid ring 4 inside the rubber boot 6. Connected to the shape memory rigid ring 4 via a lead 21 drawn from the power supply 7 to the outside of the rubber boot 6.

When the rigid ring 5 is fully extended, it conforms to the outer diameter of the cylindrical transmitter having a large-diameter cylindrical shape, and exists in a contracted state like a spring when stored (FIG. 1). )are doing.

As shown in FIG. 1, the fixing bracket 9 is attached to each of the piezoelectric ceramics 1 so as to be orthogonal to the cylindrical circumference, and fixes the shape memory rigid ring 4.

FIG. 2 shows an embodiment of the present invention in which the shape memory rigid ring 4 changes to a large diameter,
Is a block diagram showing a schematic diagram in which a block 8 is cured to form a cylindrical cylindrical transmitter. The average radius of the cylindrical transmitter is adapted to the desired mechanical resonance frequency.

The fan-shaped piezoelectric ceramics 1 used here has a structure in which one or more rectangular piezoelectric ceramics 11 as shown in FIG. The unit 14 may be used.

Next, the operation of the embodiment of the present invention will be described with reference to the drawings. Now, heat is applied to the shape memory rigid ring 4 by passing an electric current from the power supply 7 to the shape memory rigid ring 4 shown in FIG. The shape memory rigid ring 4 expands a spring-like portion to a large diameter stored in advance by heat, and the rubber bag 2 with a partition therebetween is pulled by a tensile force due to this deformation, and the partition between the partitions is pulled. The adhesive layer 40 (FIG. 4), which is a partition of a certain rubber bag 2, is set to have an adhesive force lower than the tensile force due to the deformation of the shape memory rigid ring 4, and thus is torn off. When peeled off, the main component 31 constituting the two-component mixed resin 3
And the hardener 32 (FIG. 4) are mixed vigorously because the internal pressure of one of the partitioned bags (for example, the portion where the hardener 32 is present) is high, and the two-component mixed resin 3 is hardened,
It becomes block 8 (FIG. 2).

By a series of operations caused by the deformation of the shape memory rigid ring 4, the outer peripheral rigid ring 5 is also stretched, the shape portion like a spring expands, changes to a large diameter, and in a fully expanded state, a large-diameter cylinder is formed. A cylindrical transmitter with a shape
It will be fixed from outside. Rubber boots,
By these series of operations, the shape changes according to the cylindrical transmitter shape which changes to a large diameter.

FIG. 2 is a schematic diagram of a cylindrical transmitter having a large cylindrical shape after the above-described series of operations has been completed. At this time, an electric signal having the same frequency as the mechanical resonance frequency fr (Equation 1) of the cylindrical transmitter is input from each of the leads 20A and 20B. The input electric signal causes the cylindrical transmitter to vibrate and emit sound waves.

[0021]

The effect of the present invention is that, when used, a large cylindrical transmitter with a high transmission efficiency that can obtain a low mechanical resonance frequency in a cylindrical respiratory vibration mode can be housed in a small size when not in use. That is, the storage property can be improved.

The reason is that the rubber bag 2 with a partition between
And a two-liquid mixed resin 3 which is not cured therein, a shape memory rigid ring 4 which has a large diameter shape stored in advance and which is compressed like a spring when stored, and a spring outside the cylindrical shape. By using the rigid ring 5 which is contracted as in the above, a cylindrical transmitter can be formed in a free shape.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a cylindrical transmitter when stored according to an embodiment of the present invention.

FIG. 2 is a schematic view of a cylindrical transmitter after forming a cylindrical shape according to one embodiment of the present invention.

FIG. 3 is an external view of a piezoelectric ceramic used in the present invention.

FIG. 4 is a cross-sectional view of a rubber bag with partitions during use in the present invention.

FIG. 5 is a diagram showing a conventional cylindrical transmitter.

FIG. 6 is an external view of a drive unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Piezoelectric ceramics 2 ... Rubber bag 3 ... Two-liquid mixed resin 4 ... Shape memory rigid ring 5 ... Rigid ring 6 ... Rubber boot 7 ... Power supply 8 ... Block 9 ... Fixing fittings 10A, 10B ... Electrode 11 ... Rectangular piezoelectric ceramics 12 ... Connecting bracket 13 ... Bolt 14 ... Drive unit 15 ... Oil 16 ... Rubber boot 20A, 20B ... Lead 21 ... Lead 31 ... Main agent 32 ... Curing agent 40 ... Adhesive layer 50 ... Adhesive layer 60 ... Prestress bolt

Claims (6)

(57) [Claims] 1. A two-part curable resin before curing, which is present in a rubber bag having a plurality of fan-shaped piezoelectric ceramics and a partition between them.
The cylindrical wave transmitter, characterized in that with a structure in which alternately on a circumference. 2. A shape memory rigid ring which is present in a cylindrical state in a contracted state and changes to a large diameter by heat, and a partition in a rubber bag is formed by the large diameter of the shape memory rigid ring. 2. The cylindrical wave transmitter according to claim 1, wherein the two-part curable resin is cured. 3. The cylinder according to claim 2, further comprising: a rigid ring that exists in a contracted state on the outer periphery and changes to a large diameter according to a change in the overall shape; and a rubber boot that covers the entire shape. Type transmitter. 4. A cylindrical transmitter that emits sound waves into water using a respiratory vibration mode of a cylinder, wherein a plurality of sector-shaped piezoelectric ceramics alternately arranged on a circumference and a rubber having a partition therebetween. Two-part curable resin before curing present in the bag-making, shape memory rigid ring which is shrunk inside cylindrical shape and changes to large diameter by heat, and overall shape which shrinks on outer periphery A rigid ring that changes to a large diameter according to the change in
It consists of a rubber boot that covers the entire shape, and the shape changing force of the shape memory rigid ring that changes to a large diameter due to heat, the curing of the two-component curable resin, and the large diameter according to the change in these shapes. Cylindrical transmitter characterized by being formed into a cylindrical shape by the action of a rigid ring. 5. A partition for separating a main component and a curing agent constituting a two-component curable resin in a rubber bag having a partition between them, is bonded so as to connect an inner diameter side and an outer diameter side of the cylindrical transmitter. Have been
The adhesion Yes set weaker than the tensile force at the time of the shape change of the shape memory rigid ring further partitioned one rubber bag room according to claim 4, characterized in that the internal pressure are raised Cylindrical transmitter. 6. The cylindrical wave transmitter of claim 5, characterized in that the existing portion of the partitioned rubber bag internal pressure is high Citea Ru part of the room the curing agent.