WO2002047432A1

WO2002047432A1 - Wave transmitter/receiver capable of emitting a plurality of frequencies

Info

Publication number: WO2002047432A1
Application number: PCT/JP2001/010560
Authority: WO
Inventors: Sigeyasu Isida
Original assignee: Sigeyasu Isida
Priority date: 2000-12-05
Filing date: 2001-12-03
Publication date: 2002-06-13
Also published as: JP3538817B2; JP2002174679A

Abstract

Ultrasonic wave has conventionally been used in depth measuring or fish detecting in water, and a ceramic vibrator based on a piezo-effect principle is very often used as a device for emitting this ultrasonic wave. A ultrasonic wave emitting-wave transmitter/receiver by a ceramic vibrator based on this piezo principle and having a better emission efficiency than before. Almost all the ceramic vibrator-based ultrasonic vibrators currently available use one frequency as a frequency that can be efficiently emitted from one vibrator, because a ceramic vibrator has only one portion where the most efficient natural oscillation frequency is available. Improvement has been made so that a second natural oscillation frequency offered by a combination of a ceramic vibrator and a steel block is available, in addition to the best natural oscillation frequency provided by a ceramic vibrator, to coexist with the ceramic vibrator's natural oscillation frequency, whereby the improvement is such that two ultrasonic wave frequencies can be used with only one vibrator.

Description

Description Transceiver capable of transmitting multiple frequencies Technical field

The present invention relates to an improvement in a wave transmitting / receiving device that emits an ultrasonic pulse into a liquid such as seawater or water to perform sounding or fish school detection. That is, an ultrasonic sounding device or a fish finder used in seawater or underwater requires a wave transmitting / receiving device to emit ultrasonic waves. Ceramic vibrators have been widely used. The present invention relates to an improvement in an ultrasonic transmitting device of a transmitting / receiving device using the piezoelectric element. Background art

It has not been said that the efficient use of ceramic vibrators for ultrasonic emission used in these applications has been thoroughly studied, and even today, transducers for sounding or fish detection are large. The major drawback was the relatively heavy weight and low output. Thus, the present invention has made significant improvements in the performance of this part. That is, the conventional ceramic oscillator used for this purpose only emitted one ultrasonic wave because of the most efficient emission frequency of any one ceramic oscillator. At present, there was only one, and the output was lower than that of the others, so nobody else could use it. Although it was a ceramic vibrator, it succeeded in emitting a plurality of efficient ultrasonic waves, and completed a transducer that emits multiple ultrasonic waves while being a single transducer. As a proposal for improving the performance of the wave transmitting and receiving device, the applicant previously attached a heavy and large acoustic impedance object to the side opposite to the diaphragm side of the ceramic vibrator to increase the efficiency of sound emission and increase We applied for an improved version that would launch more powerful ultrasound. However, in this case, the bonding between the ceramic vibrator and the back object is generally the whole surface bonding, and the specific method is not mentioned.

However, as a result of conducting a number of experiments, it was found that there was no complex standing wave in one ceramic vibrator at low or high frequencies. In the case of a small ceramic vibrator, the entire surface may be connected between the ceramic vibrator and the back object, but if the frequency is high or if there is a complex standing wave in one vibrator, the standing It was found that performance would drop if not fixed at the nodes or belly of the waves. The applicant has now completed an improved wave transmitting and receiving device that can exhibit the maximum performance unless the performance can be slightly sacrificed. As a by-product, we have completed a transmitter / receiver that can efficiently emit multiple frequencies while using only one oscillator. Disclosure of the invention

As described above, when the frequency of the ultrasonic wave is very high or the size of the ceramic vibrator is more than a certain size, a complex standing wave is generated on the surface of one vibrator. And this standing wave generates concentric nodes and antinodes in the same part, and the node f fluctuates little and the antinodes vibrate greatly. If the ceramic vibrator is fixed by using the parts, the same vibrating part will be fixed and supported, so the present invention focuses on the place where the original vibration is repeated with little decrease in performance . Next, the reason why a heavy object such as an iron lump is provided on the back side is to make the acoustic impedance on the back side as large as possible. In the previous invention, the heavier the weight, the better. However, if the weight of this heavy object is properly selected, the natural vibration also exists in that object. This can also contribute to the output of ultrasonic waves if the natural frequency is appropriately selected. Therefore, the applicant has set the natural frequency to match the second and third natural frequencies of the ceramic vibrator so that a single ceramic vibrator can transmit and receive multiple ultrasonic waves. This is a completed wave device. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a typical sectional structural view showing the basic structure of the contents described in claims 1 and 2 of the present invention.

FIG. 2 is a view of an embodiment showing a specific method for supporting a separator (3) provided between the back object and the ceramic vibrator according to claims 1 and 2. FIG. 3 is a view showing a specific embodiment of the heavy object (4) provided on the back surface according to the third aspect, including an application example thereof.

FIG. 4 is a view showing a typical embodiment of the present invention in which a plurality of ceramic vibrators are provided on one diaphragm shown in claim 4 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

The specific structure will be described below with reference to the accompanying drawings so that the present invention can be more specifically understood.

A typical embodiment will be described with reference to FIG. 1. (1) shows a case where a ceramic vibrator which emits a desired ultrasonic frequency and which is the same as a conventionally used ceramic vibrator is used. The front surface of the ceramic vibrator shown in (1) above is provided with a vibrating plate (2) made of a material with good consistency with seawater made of urethane or plastic plates, etc. There is no difference between the object and the structure. The difference from the conventional structure is the structure of the back side. The back side of the ceramic vibrator (1) has an acoustic structure such as a ring-shaped or columnar-structured porcelain (ceramic) that supports one concentric or central part. By providing the rigid separator (3;), an object having a large acoustic impedance such as an iron lump (4) similar to that shown in the previous application is attached to the back surface. It is important at this time that the mechanical natural frequency obtained by combining the natural frequencies of the iron block (4) and the ceramic vibrator (1) provided on the back surface is the second and third of the ceramic vibrator (1). This oscillator (1) has the same natural frequency as that of the oscillator that can use both its fundamental frequency and the second or third natural frequency. It seems that there is no idea how to use the moving element.

For other structures, the conventional structure can be used as it is (6) is a material such as urethane foam that acoustically insulates the outside of the vibrator (1) or the iron ingot (4), or a simple air chamber or foam. (7) The outer case is made of urethane molding material.

Fig. 2 is an explanatory view showing the contents of the separator and the radiator (3) according to claims 1 and 2, and a separator for fixing the ceramic vibrator (1) and the iron ingot (4) specifically. 3) shows the support structure of (a) where the ring-shaped support is used, (b) where the concentric part is supported by a plurality of cylinders, and (c) where one center part is a single cylinder This is an example of the case where the support is made by the above. Above all, when it is supported at one central point, as shown in (c), it is an excellent one that can exhibit fairly high performance even when a single ultrasonic wave is emitted.

Fig. 3 is an explanatory view of the contents shown in claim 3. (a) When the back object is a simple iron ingot (4), (b) applies for the back object (4;) in Japanese Patent Application No. 1996-357460. (La) is a ceramic vibrator (lb) is an iron lump bonded to the back. (C) is the same as the conventionally used ceramic vibrator (1) except that the frequency is different from that of the first ceramic vibrator provided on the front. In this case, the frequency does not necessarily have to match the second and third natural frequencies of the vibrator (1) provided on the front surface, and any desired frequency can be used. Thus, the feature in this case has a great feature that the desired frequency is selected first and each frequency can be emitted.

FIG. 4 shows a concrete embodiment of the content of claim 4. This type of wave transmitting / receiving device is composed of a plurality of ceramic vibrators (1a) (lb) on one diaphragm (2). The transmitter / receiver with this structure has a disadvantage in that it has a single large diaphragm. (2) The ceramic vibrator (1a) (lb) However, there was a drawback in that the output was not greatly increased in proportion to the size because the result was small.

The present invention is intended to provide an epoch-making transmission / reception apparatus which can solve the above-mentioned drawbacks and can greatly increase the output and can emit a plurality of frequencies. Explaining the contents according to Fig. 4, (2) is a large vibrating plate on which a ceramic vibrator (1a) (lb) They are arranged according to their purpose. In the conventional structure, only the soundproofing material etc. is provided directly on the back side, and the back side is hardly loaded and the acoustic impedance is extremely low, so the output of this type of transmitting and receiving device is inefficient at present. there were. In the present invention, the output is increased by improving this, so that a ring-shaped or concentric circle similar to that shown in FIG. 2 is provided on the back of the ceramic vibrator shown by (1a) and (1b). Separator consisting of a plurality of columns at the position (3a) (3b) • 'is provided. The structure of the separators (3a) and (3b) is the same as that of FIG. Further, a heavy object consisting of a single large iron plate (4) covering the whole of the vibrators (1a) (1b) · · is fixed to the back surface.

In addition, the back side is covered with styrofoam (6), which is an acoustic shield in the same manner as before, and the purpose and structure of this styrofoam are the same as those of conventional ones. The description is omitted because it is good, and the drawing display is also omitted. The above is an example showing a specific structure of the present invention.

The features and advantages of the present invention will be described below. First, a heavy object (4) such as an iron plate with a large acoustic impedance is attached to the back of the ceramic vibrator (1a) (1b). As a result, the acoustic energy of the ultrasonic waves emitted to the rear side is not wasted, and more ultrasonic waves are emitted to the diaphragm side (2). Details of this period are described in Japanese Patent Application No. 1996-357460. Second, as explained in the example shown in Fig. 1, the natural vibrations of ceramic resonators (1a) and (1b) etc. and the heavy objects such as iron plate (4) provided on the back side are included. Since there is a total natural vibration, the second and third ultrasonic vibrations can be obtained using this natural vibration. The two effects described here are major features that have not been seen in conventional transmitter / receivers.

As a precautionary measure, the member indicated by (5) throughout shows the cable drawn from the ceramic vibrator. Potential for industrial use

The ultrasonic transmission / reception device according to the present invention is an invention developed as an improved type of Japanese Patent Application No. 1996-357460, and is capable of emitting an unprecedented powerful ultrasonic wave while being a single transmission / reception device. It can emit multiple ultrasonic waves.If multiple ultrasonic transmitters are prepared in one fish finder or sounding device, it can be used immediately without having to replace the transmitter and receiver for each frequency. It provides a convenient transmitting and receiving device. Conventionally, two fish finder or sounding equipment had to be prepared and placed in a troublesome way, but the epoch-making transmission and reception that can achieve the purpose only by preparing one fish finder or sounding equipment It provides a wave device. T JP01 / 10560

6 To add further, the concept of the transmitter / receiver for multiple frequency emission is not limited to sounding equipment and fish finder, but is also applicable to increasing the output of ultrasonic cleaners and ultrasonic detectors using ultrasonic waves used for medical treatment. Can be used as is.

Claims

The scope of the claims

1. An application in which an object with a large acoustic impedance such as an iron lump is provided on the back of a ceramic vibrator in order to increase the output of a ceramic-based ultrasonic wave transmitter / receiver used in seawater or underwater. A further improvement was made in accordance with Japanese Patent Application No. 1996-357460, which is a separation made of a newly acoustically rigid porcelain (ceramic) between an iron ingot and a ceramic vibrator. The iron block and the ceramic vibrator are fixed in a state where a plurality of vibrators are scattered at ring-shaped or concentric positions so that multiple natural vibrations exist in one vibrator. Thus, a plurality of resonance frequencies are provided in one vibrator.

2. In the transmitting / receiving device for multi-frequency emission according to claim 1, the method of supporting the separator provided between the iron block provided on the back surface and the ceramic vibrator is a method of supporting the antinode or node of the vibration of the ceramic vibrator. A transmitting / receiving device for multi-frequency emission, characterized in that it is supported at a portion or a central portion.

3. In the transmitting / receiving device for multi-frequency emission according to claim 1, another ceramic vibrator having a frequency different from that of the ceramic vibrator provided on the front is used instead of the iron block provided on the back, or A multi-frequency transmitting / receiving device characterized by being used in place of a vibrator according to Japanese Patent Application No. 1996 357460, in which an iron lump is carried on the back of a ceramic vibrator.

4. Transmitter / receiver for ultrasonic emission used in seawater or underwater Among them, a plurality of ceramics are used in a transmitter / receiver in which a plurality of ceramic vibrators are mounted on the diaphragm of one transmitter / receiver. A high acoustic impedance object such as a single iron plate is provided to cover the entire back surface of the vibrator, and an acoustically rigid porcelain (ceramic) similar to that shown in claim 1 is provided here. An object consisting of the same is scattered at multiple locations in a ring or concentric shape on the back of each element, and multiple natural vibrations of the element and the entire natural vibration including the iron lump provided on the back are used. And transmitting a plurality of resonance frequencies while being a single vibrator.