JPH01186995A - Sounding board device and its attaching method and fish guide device using this device - Google Patents

Abstract

PURPOSE:To efficiently transmit oscillation to an object to which oscillation should be transmitted by providing two magnetic pole plates different in magnetic pole, a diaphragm consisting of a magnetic material fixed to magnetic pole plates, and a coil which is arranged on the outside of the diaphragm and to which an AC current is supplied. CONSTITUTION:When magnetic pole plates 8a and 8b of a permanent magnet 7 have N and S poles respectively, a magnetic field is generated in a coil 11 by the current flowing in one direction in the coil 11, and fixed-side and open- side end parts of a diaphragm 9 are polarized to S and N poles respectively, and the open-side end part of the diaphragm 9 is attracted to the magnetic pole plate 8b of the S pole. When the flow direction of the current to the coil 11 is inverted, the direction of the magnetic field generated in the coil 9 is inverted, and fixed-side and open-side end parts of the diaphragm 9 are polarized to N and S poles, and the open-side end part of the diaphragm 9 is attracted to the magnetic pole plate 8a of the N pole. This operation is repeated to oscillate the diaphragm 9. Thus, oscillation is efficiently transmitted to said object to obtain sound due to oscillation of this object.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transmission device array I that applies vibrations to transmitted objects such as window glass and walls, and generates sound by the vibrations of these transmitted objects. The present invention relates to a method for attaching the sound transmission device and a fish guiding device using the sound transmission device.

[Conventional technology]

Conventionally, electroacoustic transducers such as speakers have been used to efficiently convert mechanical vibrations of diaphragms, vibrating bodies, etc. into sound, but the purpose of this type of device is to generate mechanical vibrations using electrical signals. The purpose is to efficiently extract the generated mechanical vibration energy as sound energy.

By the way, with the recent rapid changes in lifestyles, not only conventional audio equipment using electroacoustic transducers such as radios, television receivers, and stereo equipment, but also lighting equipment, clocks, and various interior decoration items are becoming more popular. Efforts have been made to make it easier to pronounce.

However, in the past, in order to make sounds from objects such as various interior decoration items, it was necessary to attach a sounding device consisting of an electroacoustic transducer to these objects themselves, which resulted in the inconvenience of increasing the size of the objects themselves and spoiling their appearance. Furthermore, there is a problem in that the above-mentioned sound generating device cannot be easily installed or removed.

Therefore, it is conceivable to transmit the mechanical vibration of the vibrating piece directly to an object (ζ), such as a music box.

That is, as shown in FIG.
It is based on the principle that a protrusion (4) provided on a rotating drum (3) is repelled to vibrate, and this vibration is amplified by the resonance of a resonance box (5).

At this time, if the resonance box (5) is placed on a transmitted object (6) such as a table as shown in Figure 21, the resonance of the resonance box (5) will cause the resonance box (5) to By directly transmitting the vibration to the object (6), that is, by the sound conduction effect, it becomes possible to further amplify the vibration of the vibrating element (2) and transmit it to the transmitted object (6).

Therefore, it is conceivable to attach a sound transmission device that directly transmits the vibration of the vibrating element to an object using such a sound transmission effect to the above-mentioned interior decoration or the like.

[Problem to be solved by the invention]

However, such a sound transmission device has not existed in the past, and even if a sound transmission device with the same configuration as a music box as shown in Fig. 21 is attached to an object to be transmitted such as an interior decoration, the vibration element (2) Since the natural frequency is constant, the sound obtained from the transmitted object (6) remains a single tone, and in order to obtain a melody by combining many sounds, a large number of vibrating pieces are provided. This results in an increase in the size of the device, and there is a problem in that the sound transmission efficiency is poor and vibrations cannot be efficiently transmitted to the transmitted object.

Therefore, in this invention, an electrical signal such as a current or a voltage is converted into a mechanical vibration of a diaphragm having a frequency corresponding to the frequency of the electrical signal, and a transmission system that can transmit the vibration of the diaphragm to a transmitted object is developed. It is an object of the present invention to provide a method for attaching a sound transmission device so that vibrations of the sound transmission device can be efficiently transmitted.

Another object of the present invention is to provide a fish guiding device that uses such a sound transmission device to generate sound waves that guide fish underwater.

[Means to solve the problem]

Next, means for achieving the above object will be explained using the drawings of FIGS. 1 to 20 corresponding to the embodiment.

That is, in the present invention, as shown in FIG.
) and two magnetic pole plates (8a), (8b) of different magnetic poles arranged parallel to the upper and lower surfaces of the magnetic pole plates (8a), (8b).
b) A fixed stand (1
A technology comprising: a diaphragm (9) made of a magnetic material fixed to the magnetic pole plate via a diaphragm (9); and a coil (11) arranged outside the diaphragm (9) and through which an alternating current is passed. We are taking appropriate measures.

Furthermore, as shown in FIGS. 4 to 8, two magnetic pole plates (16a) and (16b) of different magnetic poles are disposed parallel to the upper and lower surfaces of the magnet and have a substantially rectangular frame shape; A notch (17) formed at the center of the front end of each of the magnetic pole plates (1f3a) and (16b), and both magnetic pole plates (16a)
, (16b), the rear end of which is made of a magnetic material and fixed to the rear end of the magnetic pole plates (16a) and (16b) via a non-magnetic material. , attached to the front end of the diaphragm (19), and both the notches (1711
A vibrator (20) made of a magnetic material disposed on the diaphragm (19) and a coil (21) disposed outside the diaphragm (19) and through which an alternating current is passed may be provided.

Further, as shown in FIG. 9, a plate-shaped bimorph (25) may be provided, one end of which is fixed to the holder and to which an alternating current voltage is applied.

In order to efficiently transmit the vibrations of the sound transmission device to the transmitted object, the sound transmission device (28) is pressed against the transmitted object (30) using a permanent magnet 4 as a fixture, as shown in Fig. 11. It is best to install it by

Furthermore, as shown in FIGS. 14 to 18, a sound transmitting device (51) is attached to the grip part of the fishing rod G39), and the above-mentioned There is a fish guiding device that is provided with an underwater sound wave radiating means (43) that generates a sound wave for guiding fish from the vibration 1ζ of the sound transmission device (51) transmitted through a target rod 09) and a fishing line (40).

[Effect]

Therefore, according to the present invention, when an alternating current is passed through the coil (11), an alternating magnetic field whose direction changes depending on the direction of the current is generated inside the coil (11). (9) The polarization at both ends changes,
Depending on the polarity of the unfixed open end of the diaphragm (9), this open end is attracted to the N or S pole magnetic pole plate;
By repeating these operations, the diaphragm (9) vibrates,
This vibration is transmitted to the transmitted object via the magnetic pole plates (8a) and (8b).

In addition, both magnetic pole plates (16a), (16
b) A notch (17) is formed in the center of the front end, and when the vibrator (20) is disposed in both of the notches (17), the vibrator 2
Since there is no restriction on the 0+ vibration, it becomes possible to increase the amplitude of the vibrator -.

Furthermore, when transmitting vibrations to a transmitted object that is easily affected by the magnetic field generated by the coil (11) as described above, a sound conductive device equipped with a bimorph (25) can be used to reduce the influence of the magnetic field. Vibration is transmitted to the transmitted object without causing any
Effective.

In addition, when the sound transmission device is attached in pressure contact with the transmitted object (30) using a mounting tool such as a magnet or a suction cup, the sound transmission device (28
) to the transmitted object l, 30) can be improved.

Furthermore, a sound transmission device (51) and an underwater sound wave radiation means (43)
) generates sound waves in the water with the same frequency as the sound waves emitted by fish when they eat food (this makes it possible to easily guide fish.

〔Example〕

Next, the present invention will be explained in detail with reference to FIGS. 1 to 20 showing embodiments thereof.

(Example 1) First, FIG. 1 and FIG. 2 showing Example 1 will be explained.

In those drawings, (7) is a permanent magnet, (8a),
(8b) is two magnetic pole plates with different magnetic poles arranged parallel to the upper and lower surfaces of the permanent magnet (7), and (9) is both magnetic pole plates (8a).
, (8b), one end of which is made of a magnetic material such as mild steel and fixed to the lower magnetic pole plate (8b) via a fixed base (10) made of a non-magnetic material such as glass fiber. board,
(11) is a coil, both magnetic pole plates (8a), (8b)
An alternating current obtained by converting, for example, an audio signal into an electrical signal is passed through the coil (11) by a power source (not shown), which is disposed outside the diaphragm (9) between the coils.

By the way, the polarity of the permanent magnet (7) is as shown in Fig. 2(a),
As shown in (b), the upper side is the N pole and the lower side is the S pole, and both magnetic pole plates (8a) and (8b) are N and S poles, respectively.
In the case of a pole, the current flowing in the coil (11) in one direction generates a magnetic field inside the coil (9), and this magnetic field causes the diaphragm to move as shown in FIG. 2(a). Assuming that the fixed side and open side ends of (9) are polarized to S and N poles, respectively, the open side end of diaphragm (9) is N pole, so the lower S pole magnetic pole plate (8b ) to the diaphragm (9
) is suctioned.

Next, when the direction of current flowing back to the coil (11) is reversed, the direction of the magnetic field generated inside the coil (9) is reversed, and as shown in Figure 2), the fixed side of the diaphragm (9) Since the open end is polarized to N and S poles, the open end of the diaphragm (9) is attracted to the upper N-pole magnetic pole plate (8a), contrary to the case in Figure (a). In this way, the open end of the diaphragm (9) is attracted to the magnetic pole plate (8a) or (8b) depending on the direction of current flow to the coil (11).

By repeating these operations, the diaphragm (9) vibrates, and the vibration of the diaphragm (9) causes the entire device to move as shown in Figure 2 (
a), (b) It vibrates in the direction shown by the arrow in the middle, and by attaching the lower magnetic pole plate (9) in pressure contact with the object to be transmitted, such as window glass, the vibration can be efficiently transmitted to the object to be transmitted. The sound produced by the vibration of the transmitted object is obtained.

Therefore, it can be used for transmitting voices through the window glass of buildings, trains, and automobiles, and transmitting voices through walls, and furthermore, it is possible to generate predetermined melodic sounds from lighting equipment and various interior decorations.

Note that an electromagnet may be provided instead of the permanent magnet (7).

(Example 2) Next, FIG. 3 showing the second embodiment will be explained.

Figure 3 (here, (12) is a permanent magnet with ε magnetic poles on the upper surface side and lower surface side, (13a) and (13b) are permanent magnets (12 + (7) upper and lower surfaces (these are arranged in parallel and have a rectangular shape) Different magnetic pole plates with frame shapes, +14) C double magnetic pole plates (
13a) and (13b), a diaphragm made of a magnetic material with one end fixed to both magnetic pole plates (13a) and (13b) via a non-magnetic material; (15) is a coil; It is disposed outside the diaphragm (14), and an alternating current is passed through it by a power source (not shown).

Then, by the same operation as in the first embodiment described above, the other end of the diaphragm (14) that is not fixed vibrates.
The same effect can be obtained. In addition, permanent magnet (1
It goes without saying that 2) may be used as an electromagnet.

(Embodiment 3) Furthermore, FIGS. 4 to 8 show Embodiment 3 (more details will be explained below).

In those drawings, (16a) and (16b) are the upper and lower surfaces of a permanent magnet (not shown).
17) is a notch formed at the center of the front end of both magnetic pole plates (16a) and (16b), and (18) is a notch formed at the front and rear ends of the cylindrical body (IZ) and the cylindrical body (I81') in the front and rear direction. It consists of 9 magnetic pole plates (16a), (1
The coil bobbin (+9) is inserted inside the cylindrical body (18) of the bobbin (18) and its rear end is connected to both magnetic pole plates (16a) through a non-magnetic material.

(16b) The rear end part (this is a fixed longitudinal diaphragm made of a magnetic material, shi0) is a vibrator made of a magnetic material,
It is attached at right angles to the front end of the diaphragm (19), and both cut-out parts j
17) (This is arranged.

(21) is a coil wound around the bobbin (a coil wound around the diaphragm (19), and through which an alternating current is passed by a power source (not shown); the rear end of the upper surface of the magnetic pole plate (16a) and the magnetic pole, respectively. Two plate-shaped spacers in the left and right direction made of magnetic material are disposed in contact with the rear end of the lower surface of the plate (16b), and (23) are four armatures made of magnetic material;
They are disposed in contact with the left and right end portions of the upper surface of the magnetic pole plate (16b) and the left and right end portions of the lower surface of the magnetic pole plate (16b), respectively.

In this case as well, the front end of the diaphragm (19) and the vibrator (20) are vibrated by the same operation as in Examples 1 and 2, but the main difference from Examples 1 and 2 is that the vibrator (20) vibrates at the notch (1), so the vibrator (20) vibrates at the notch (1).
0) is not limited in amplitude, and as a result, large-amplitude vibrations can be obtained, making it possible to transmit large vibrations to the transmitted object, such as when transmitting a message through window glass. Very effective.

(Example 4) Next, FIGS. 9 and 10 showing Example 4 will be explained.
- It is a cut front view at A'.

In FIG. 9, reference numeral +241 denotes a holder, which has a shape in which two rectangular frame bodies are stacked at the front and rear ends of 9 with a spacer interposed therebetween. (2) and 5) are four plate-shaped bimorphs, which are arranged in the inner space of the holder circle, the rear end portions of which are fixed to the holder (24), and a power supply terminal portion (26a).

(26b) is applied with an AC voltage from a power source.

When no alternating current voltage is applied to each bimorph t25), as shown in FIG. 10(a), the front end outside each bimorph is not distorted, and each bimorph When a voltage of this polarity is applied, each bimorph (2
The front end of 5) is distorted upward, for example, and the power supply (b) causes each pymorph ■5)i? : When a voltage of opposite polarity is applied, each bimorph (2
) The front end of the uniform is distorted downward, and by repeating these steps,
Each bimorph fox vibrates, causing the holder (24) to vibrate, and the vibration of the holder (24) is transmitted to the transmitted object.

At this time, it goes without saying that the same effect as in the above-mentioned embodiments can be obtained, but also when the transmitted object is
This is very effective in cases where the magnetic field of the magnet must not be affected.

In addition, the number of bimorphs (25) is not limited to four,
1.2.It goes without saying that you can use 3 or 5 or more.

(Example 5 to Example 7) Next, FIG. 11 shows Examples 5 and 6.7, respectively.
FIG. 12 and FIG. 13 will be explained. However, in each figure, the reference character is a sound transmission device having the configuration of the first, second, third, or fourth embodiments described above.

First, in FIG. 11, 9) is a permanent magnet that is a fixture fixed to one side of the sound transmission device, and 30 is a transmitted object made of ferromagnetic material. From here,
The transmission device (30) is indirectly connected to the transmitted object (30) via the permanent magnet (29) which is attached by pressure contact, and the vibration of the transmission device (30) is solid.
transmitted to.

Next, in FIG. 12, (31) is an auxiliary root skin made of a ferromagnetic material such as iron fixed to one side of the sound transmission device, and a permanent magnet (33) removably provided on the auxiliary plate G2. ) and a magnet body (34) with a built-in magnet (34), (35) is a transmitted object made of weakly magnetic or non-magnetic material, While holding the object (3ω), the transmission device is attached to the transmitted object (35) in indirect pressure contact, and the transmission device (28
) is efficiently transmitted to the transmitted object (3) via the solid auxiliary plate (3 forces).

Furthermore, in Figure %13, (3Q is a suction cup as a fixture that is attached by a screw (371) that covers the minus side of the sound transmission device 28, and (38) is a transmitted object with a smooth surface. , regardless of the material of the transmitted PS □□
It is attached by direct pressure welding, and the sound transmission device (2
8) is efficiently transmitted to the transmitted object (38).

By the way, if the vibration intensity of the sound transmission device (c) is X, then between the sound transmission device (281) and the transmitted object (30), there is The force F (= f (X)
) occurs, so the transmitted object (
Depending on the material of 30), +35), (38),
By the mounting method shown in FIG. 11, FIG. 12, or FIG.
(It can be installed on the 351s H.

At this time, if the sound transmission efficiency is E, there is a relationship of E = f (F, K), so if the joining force K is less than or equal to the rejection force F, that is, ≦F, then the transmission efficiency E As the condition worsens, the hammer phenomenon appears as a pre-abnormal condition.

In addition, in Figure %12 (here, the auxiliary plate (321) and the magnet body example may be replaced and the magnet body (34) may be fixed to the sound transmission device panel, or the auxiliary plate (32 may be formed of a permanent magnet). Good too.

In addition, in Fig. 13, if the surface of the object to be transmitted (38) is not very smooth, the suction cup (inner surface marked with 3) should be coated with grease or the like to improve airtightness and suction power. You can.

(Embodiment 8) Next, FIGS. 14 to 18 showing Embodiment 8 will be explained.

In those drawings, (39) is a fishing rod, the seagull is a fishing line,
(41) is a reel installed in the grip of the fishing rod (39); (4) is a reel installed in the grip of the fishing rod (39) and has the configuration of the above-mentioned embodiment 4; and its drive circuit. (C) is a fishing line (40
) is an underwater sound wave emitting means provided near the tip of the
It consists of a sonic radiator made of one or more plate-shaped metal or resin, and a sonic reflector (4) that also serves as a weight. At this time, the reflector (45) has a curved surface. It has a smooth spherical surface and reflects and diffuses the underwater sound waves produced by the radiator @brown.

Next, the 15th section shows the configuration of the fish guidance control device (42).
The figure and %16 figure will be explained.

In those drawings, (461 is a case, @Riki is a case (461 houses various circuit elements that constitute an oscillation circuit, which will be described later).
49) is the batch IJ stored in the case (46), (
50) is a metal plate partially exposed at the bottom of the case (46); ), and an oscillation signal generated by an oscillation circuit (described later) is applied to the bimorph.

Attachment bands (52) are provided at two locations at the bottom of the case (461), and as shown in FIG. 16, fix the case (A) to the grip of the fishing rod (39).

Furthermore, the oscillation circuit built into the printed circuit board (47) has the block configuration shown in Figure 17, and in the figure, (53) is a memory that stores multiple sound wave waveform data for guiding fish. and D of subsequent data from the memory.
/A conversion section, (54) is a start switch for reading data from the storage section (53), (,5
5) is an address switch for selecting the address of the memory in the storage section (53), (56) is a clock oscillation section for the read clock, and (57) and (58) are a preamplifier and a main amplifier. The output signal from the D/A converter is amplified and applied to the bimorph of the sound transmission device (51).

In addition, each part (53), (56) from the battery (49) country
, (57), and (58).

As shown in FIG. 18, when the bimorph of the sound transmission device (51) is applied with the output signal of the oscillation circuit described above, the bimorph vibrates in accordance with the output frequency of the oscillation circuit and transmits the sound. The entire device (51) vibrates, and the metal plate φ
The vibration of the sound transmission device (51) is transmitted through the fishing rod (39f
T? : This vibration is further transmitted to the radiator (44) via the fishing line (4 homs), and the radiator (44) is transmitted to the first
The underwater sound wave for guiding fish is generated by vibration in the direction of the arrow in Fig. 8, and this underwater sound wave is reflected and diffused by the surface of the reflector (45) which also serves as a weight.

At this time, by determining in advance the waveform of the sound waves emitted when the fish eats food and storing the determined waveform data in the memory of the storage section (53), underwater sound waves for guiding the fish can be generated. It becomes possible to guide fish easily and effectively.

Therefore, regardless of the level of fishing proficiency, it becomes possible to catch a large number of fish by gathering them together.

In addition, instead of the sound wave reflector (45) shown in FIG. 14, a spherical sound wave reflector (59) that also serves as a weight as shown in FIG. 19 as Example 9, or as shown in FIG. A conical sound wave reflector (60) that also serves as a weight may be used, in which case the sound wave reflector (59) shown in FIG.
is a completely diffused type, and the sound wave reflector (60
) is a parallel reflection type that maintains some degree of directivity.

〔Effect of the invention〕

As described above, according to the sound transmission device, its mounting method, and the fish guidance device using the sound transmission device of the present invention, it is possible to vibrate the other end of the diaphragm with one end fixed. It is now possible to transmit this vibration to objects such as window glass, wood decorations, and door decorations through the magnetic pole plate, and it is possible to transmit vibrations through the window glass of buildings, trains, and automobiles. It can be used to transmit messages through walls, and it can also generate melodic sounds from lighting fixtures and various interior decorations that have not been produced before.

In addition, by arranging the vibrator in the notch formed in the center of the front end of the square frame-shaped magnetic pole plates, it is possible to increase the amplitude of the vibrator. It can be transmitted to the transmitted object.

Furthermore, when transmitting vibrations to an object that is easily affected by the magnetic field generated by the coil as described above, it is recommended to use a bimorph-based transmission device or to avoid the influence of the magnetic field. It is very effective in transmitting vibrations to the target object.

Further, by attaching the sound transmission device in pressure contact with the object to be transmitted using a mounting tool such as a magnet or a suction cup, it is possible to improve the sound transmission efficiency between the transmission device and the object to be transmitted.

Furthermore, the sound transmission device and the underwater sound wave emitting means can generate sound waves in the water that have the same frequency as the sound waves emitted by fish when they eat food, making it possible to easily guide fish.

[Brief explanation of the drawing]

1 to 20 show an embodiment of the sound transmission device of the present invention, its mounting method, and a fish guiding device using the sound transmission device, and FIGS. 1 and 2 show Example 1, and FIG. 1 is a side view, FIGS. 2(a) and 2(b) are side views in different states, FIG. 3 is a perspective view of the second embodiment, FIGS. 4 to 8 show the third embodiment, and FIGS. Figure 4 is a perspective view, Figure 5 (a
), (b), and (C) are partial plan views. Front view and left side view, Figure 6 is a plan view of the magnetic pole plate, %7
Figures (a) and (b) are a plan view and a front view of the coil bobbin, Figures 8 (a) and (b) are a top view and left side view of the diaphragm and vibrator combined, and Figures 9 and 8 are a left side view of the coil bobbin. 1
Figure 0 shows Example 4, Figures 9 (a) and (b) are a plan view and cutaway front view, and Figures 10 (a), (b),
(C) is an explanatory diagram of the operation, FIG. 11, FIG. 12, and FIG. 13 are partially cutaway side views of embodiments 5, 6, and 7, respectively, and FIGS. 14 to 18 show embodiment 8, 1st
4 is a perspective view, FIGS. 15 and 16 are a partially cutaway plan view and cutaway front view of the guidance control device, FIG. 17 is a partial block configuration diagram, FIG. 18 is an operation explanatory diagram, and FIG. 19 and second
Figure 0 is a front view of a part of Examples 9 and 10, respectively.
Figure 1 is an explanatory diagram of the principle of a general music box. +7+ $ ++2)--Permanent magnet, (8a), (8
b), (13a), (13b), (16a), (16b
)...magnetic pole plate, +9+, (14), (+9+
-...Diaphragm, (1o)...Fixed stand, IL (15+
, (21+...coil, (17)...notch, (
2o)... Vibrator, Portrait)... Holder, (20...
Bimorph, anger transmission device, n91 p +33+...
・Permanent magnet, (3Ql 9 (35), (38)・
... Transmitted object, (36) ... Suction cup, (39) ... Fishing rod, (40) ... Fishing line, (43) ... Underwater sound wave emission means, (51) - Sound transmission device.

Claims (5)

[Claims] (1) Two different magnetic poles arranged parallel to the upper and lower surfaces of the magnet
a diaphragm made of a magnetic material disposed between the two magnetic pole plates and having one end fixed to the magnetic pole plate via a non-magnetic material; What is claimed is: 1. A sound transmission device comprising: a coil through which a current is passed. (2) two magnetic pole plates of different magnetic poles arranged parallel to the upper and lower surfaces of the magnet and having a substantially rectangular frame shape; a notch formed in the center of the front end of each of the two magnetic pole plates; and both the magnetic poles. a longitudinal diaphragm made of a magnetic material disposed between the plates and whose rear end is fixed to the rear end of the magnetic pole plate through a non-magnetic material; What is claimed is: 1. A sound transmission device comprising: a vibrator made of a magnetic material disposed at the diaphragm; and a coil disposed outside the diaphragm and through which an alternating current is passed. (3) A sound transmission device comprising a plate-shaped bimorph whose one end is fixed to a holder and to which an alternating current voltage is applied. (4) A method for mounting a sound transmission device, which comprises mounting the sound transmission device according to claim 1, 2, or 3 on an object to which vibrations are transmitted by being pressed into contact with a mounting device such as a magnet or a suction cup. (5) The sound transmission device according to claim 1, 2 or 3 is attached to a gripping portion of a fishing rod, and the sound transmission device is transmitted through the fishing rod and the fishing line near the tip of the fishing line of the fishing rod. 1. A fish guidance device using a sound transmission device, characterized in that it is provided with an underwater sound wave radiating means that generates a sound wave for guiding fish through vibrations.