Classifications

• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
  • G10K11/006—Transducer mounting in underwater equipment, e.g. sonobuoys
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
  • G01S15/88—Sonar systems specially adapted for specific applications
  • G01S15/96—Sonar systems specially adapted for specific applications for locating fish
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
  • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
  • G01S7/523—Details of pulse systems
  • G01S7/524—Transmitters
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
  • H04R17/04—Gramophone pick-ups using a stylus; Recorders using a stylus
  • H04R17/08—Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Definitions

• the present invention relates to a wave transmitting device that emits an ultrasonic pulse into a liquid such as seawater or underwater to detect sounding or detect a school of fish. More specifically, the present invention relates to a ceramic device using an electrostriction phenomenon called a piezoelectric element. This relates to a vibrator.
• ultrasonic sounding devices used in seawater or underwater, fish finders, etc. require a transmission device to emit ultrasonic waves, and this transmission device has conventionally been barium titanate zirconate titanate. Ceramic oscillators made of lead or the like have been widely used.
• the present invention relates to an ultrasonic wave emitting method for a wave transmitting device using the piezoelectric element.
• the primary function as an ultrasonic wave transmitting device can be sufficiently performed.
• the structure was almost completely satisfactory.
• the styrofoam (4), air chamber (5), etc. are installed directly on the back of the ceramic vibrator (1) in order to prevent the emission of ultrasonic waves, the following problems can easily occur. I understand. In other words, in the structure shown above, the energy of ultrasonic waves emitted into the water is supposed to be largely emitted to the depth side and hardly emitted to the water surface side, so it seems that the purpose has been achieved for the time being.
• the acoustic impedance on the diaphragm (2) side is relatively large, and the foam foam port (4) and the air chamber (5) on the opposing side are relatively large.
• the acoustic impedance of the ceramic vibrator (1) is extremely small, so the load balance on both sides of the ceramic vibrator (1) is very poor and more ultrasonic waves should normally be emitted on the diaphragm (2) side. Since the sound emission energy is emitted in inverse proportion to the acoustic impedance, most of the sound energy is consumed on the styrofoam (4) or air chamber (5) side rather than on the diaphragm side. Diaphragm (2) side Hardly ever fired.
• the weight of the vibrating plate (2) with respect to the vibrator (1) is more than that of the styrofoam (4) and the air chamber (5). Because it is much heavier, the easiness of vibration against mechanical vibration is also emitted more toward the styrene foam (4) side in view of the law of inertia.
• the contents will be much easier to understand.
• the acoustic circuit (A) of the transmitting device is replaced with an electrical equivalent circuit (B)
• the content of the ceramic oscillator ( ⁇ is electrically battery) Or, it is a power source (a) and is a source of energy, whereas the diaphragm (2), styrofoam (4), air chamber (5), etc. are electrically connected to the volume resistivity.
• (B), (c), and (d) are equivalent to loads connected in parallel with each other, and the acoustic energy emitted there is electrically consumed by the power. Is equivalent to
• the electrical load impedances (b), (c), and (d) show that the load ( b) and the load (c) and (d) on the Styrofoam side are the same as being connected in parallel to the power supply (a), and the magnitude of the load impedance is the same as that of the diaphragm ( b)
• the styrofoam side is much larger and higher than the (c) (d) side. The result is. In this case, most of the electric power is consumed on the styrofoam (c) (d) side in inverse proportion to the magnitude of the load.
• the same concept as that of an electric circuit is applied to audio equipment, and even if an attempt is made to apply a large load to a device with a poor load balance, no load is applied to a target location and only useless power is consumed. It is consumed in the equipment. What can be considered is to improve the load balance so that the acoustic impedance of the ceramic vibrator (1) on the styrofoam (4) (5) side is greater than the acoustic impedance on the diaphragm (2) side. Specifically, connect a material with a large acoustic impedance specific to the material. If you can't do that, place the largest possible value for them there.
• a substance (3) having a high acoustic impedance may be bonded between the surface of the vibrator (1) on the styrofoam side and the surface of the styrofoam (4).
• the present invention has been developed from such a viewpoint.
• the acoustic impedance of a diaphragm is quite large, and if the material exceeds that value, the material is considerably restricted. Furthermore, considering the conventional device, even if the acoustic impedance is not so large, even if it is at an intermediate stage between these and the conventional device, it may be sufficiently practical. Therefore, we decided to consider these intermediate stages. In other words, even if the object has the same acoustic impedance as the diaphragm, if the weight of the object provided there is made as heavy as possible and the weight on the diaphragm side is made as light as possible, on the diaphragm side by the law of inertia, Ultrasonic waves are emitted. This is a significant improvement in the apparent acoustic impedance, which is also a major improvement. Take one or both of the above measures It is understood that the efficiency of sound emission is greatly improved. BRIEF DESCRIPTION OF THE FIGURES
• FIG. 1 is a central sectional view showing a basic structure of a wave transmitting device for an ultrasonic wave emitting device according to the present invention.
• Fig. 2 shows the acoustic circuit diagram of the wave transmitting device used for the ultrasonic launch equipment and the equivalent electric circuit diagram.
• FIG. 3 is a central cross-sectional structure diagram showing a typical example of a conventionally used transmitting device for an ultrasonic wave emitting device.
• FIG. 1 is a first embodiment for effectively implementing the present invention, and is an embodiment of the invention which simultaneously satisfies claims 1 and 2.
• Claims 1 and 2 are related to each other, and (1) is an ultrasonic emission source called a ceramic vibrator, which is generally a ceramic such as barium titanate or lead zirconate titanate. Ultrasonic waves are emitted using the principle of electrostriction in a disk-shaped element made of a material.
• a disk-shaped vibrating plate (2) made of a nylon resin or an ABS resin is bonded to one side of the vibrator (1), that is, a deep side surface.
• the reason for using nylon or ABS resin is that the specific gravity is almost the same as water and the acoustic impedance is also close to water, so it is considered that ultrasonic waves can be effectively emitted into water.
• the material of this portion is not limited to this, and may be a plate material such as glass or stainless steel.
• the structure up to this point is basically the same as the conventional one, but the diaphragm should be as light as possible if possible.
• a stainless steel block (3) which is as heavy as possible and has a large acoustic impedance, is attached.
• the material of the object to be bonded preferably has a large material-specific acoustic impedance, and the greater the material-specific acoustic impedance, the more difficult it is to transmit ultrasonic waves in this direction.
• the shape of the back object (3) is not particularly specified, but generally the outer diameter is almost the same as the outer diameter of the vibrator (1) and the thickness is 1/4 ⁇ which does not disturb the waveform of the ultrasonic wave to be emitted. Let X ⁇ be normal.
• the above is the basic structure of the ultrasonic wave transmitting device according to the present invention, which is different from the conventional transmitting device in that the vibrator (the acoustic impedance which did not exist conventionally on the back of ⁇ ) is heavy in weight.
• the ultrasonic wave is emitted more toward the diaphragm (2) as described in the section of “Disclosure of the Invention.”
• the ultrasonic wave is applied to the back surface of the vibrator (1).
• the material of the object (3) to be combined is the same ceramic material as other vibrators and other metals that are not easily corroded by seawater, such as stainless steel lump and copper lump, etc. at present.
• the ceramic material is the second largest acoustic impedance material after the metal, but the ceramic material does not need to be the same material as the vibrator, and has the same high density and texture as the vibrator. If it is a dense material, a general porcelain material may be used.
• the material of the second embodiment has a large acoustic impedance inherent in the substance and satisfies the factors for obtaining a large acoustic impedance.
• the invention of the second embodiment is exactly the same in appearance and the like as the first embodiment, but only The major difference from the first embodiment is that, as in the first embodiment, the weight of the object to be bonded to the back of the vibrator is ideally heavy and the acoustic impedance is large.
• the lower limit of the body material is to be specified, and the lower limit is intended to be a material such as nylon or ABS resin that has the same or slightly higher acoustic impedance as the diaphragm (2) material.
• plastic materials such as nylon and BS resin
• admixtures obtained by mixing these plastic materials with quartz powder are also included.
• Other materials include pottery, porcelain, glass, and depending on the method of use, in addition to these, for example, gypsum * cement etc.
• the reason for the expansion is that plaster-cement can be freely molded in the future, and it is expected that a transmitter with a considerably higher degree of freedom will be manufactured in the future.
• the present invention significantly improves the load balance of the acoustic impedance and increases the acoustic impedance on the styrene foam side as much as possible. Was completed.

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Multimedia (AREA)
• Transducers For Ultrasonic Waves (AREA)
• Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (2)

Families Citing this family (4)

Citations (4)

• 1996
  • 1996-12-06 JP JP35746096A patent/JP3564613B2/ja not_active Expired - Fee Related
• 1998
  • 1998-01-21 WO PCT/JP1998/000252 patent/WO1999038027A1/ja not_active Ceased

Patent Citations (4)

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