KR100962734B1 - Resonator with multiple resonance frequencies and sound devices threreof - Google Patents

Abstract

PURPOSE: A resonator with multiple resonance frequencies and a sound system using the same are provided to improve an output by generating resonance in a natural frequency, and to absorb impact when a vehicle collision. CONSTITUTION: A resonator(20) with multiple resonance frequencies comprises a pipe member. Sound is input to one end of the pipe member. The pipe member is curved in a curved node which is separated from the input end. Multiple resonant frequencies are formed in the pipe member. A distance from the input end to the curved node is resonated in a natural frequency of each sound.

Description

Resonator with Multiple Resonance Frequencies and Sound Devices threreof

The present invention relates to a resonator having multiple resonant frequencies and an acoustic device using the same. More particularly, the resonator has a plurality of resonant frequencies by bending a tube provided with a predetermined length so as to resonate at natural frequencies of sounds constituting the input sound. It relates to a resonator having a multiple resonant frequency and an acoustic device using the same.

Generally, sound or sound wave at atmospheric pressure is defined as a phenomenon in which vibrations generated from a sound source propagate in the form of dense waves by periodically changing the atmospheric pressure.

Conventional sound waveforms exist in the form of complex sounds in which various frequencies are mixed. Here, the sound that is the fundamental frequency of the compound sound is defined as a fundamental tone, and the sound having an integer multiple of the frequency is defined as harmonics or overtones.

Sound devices such as speakers and earphones that output sound generate sound pressure by vibration of the diaphragm using the basic principles of sound waves described above, and the generated sound pressure is amplified by a predetermined resonance chamber formed inside the housing. To output sound.

A common resonance chamber is formed in a structure in which a cavity or the like is formed inside a housing to generate resonance with respect to a specific sound frequency.

By the way, the notes constituting the composite sound are a mixture of notes constituting a predetermined scale, where the height of the notes constituting the scale is determined by the fundamental frequency of the fundamental sound of the sound wave.

Representatively, referring to FIG. 1, in the 12th scale, the A sound of the piano vibrating in one second (the frequency of the A key in the center of the piano is set to 440 Hz, which is defined as an international pitch) has a pitch of 440 Hz. A note that vibrates 880 times a second is configured to produce an A note with a pitch of 880 Hz. Thus, a higher frequency sound is higher and a lower frequency sound is lower.

Also, the scale from 'low' to the next 'high' is defined as one octave. That is, one octave higher for any basic sound means that the sound has twice the frequency of the arbitrary basic sound, and two octaves higher means that the sound has four times the frequency of any basic sound.

In other words, the sound output from the sound device can be said to be faithful as the recorded sound is reproduced closer to the original sound. In general, the volume resonator (enclosure) is attached to the speaker driving unit for reproducing the sound to polish the sound.

This resonator is designed to resonate at various frequencies as much as possible in reproducing a sound source in which various frequencies are mixed, and is intended to avoid howling at a specific frequency by canceling the resonance frequency of the speaker drive unit itself. .

Another advantage of attaching the enclosure is that it blocks the speaker drive unit from the surroundings (walls, rear spaces) to ensure a consistent sound independently.

Among the sound reproducing devices that are closely used in our lives, earphones, headphones, small speakers, and automobile speakers are being used without securing resonance space due to physical size limitations or structural limitations of the device.

Therefore, if you develop a tubular resonator that can be attached in a narrow space and can achieve resonant performance similar to a volume resonator (enclosure), it can provide a great acoustic experience for many people.

It is already widely known that the resonance frequency changes depending on the length of the straight pipe in the case of the sound resonance in the pipe, but the bent portion, the inner jaw, the branch point, and the Helmholtz resonator are attached to the pipe. There was no technical explanation for the case where the shape is out of one dimension and the resonance phenomenon is complicated.

Through many experiments, analysis of results, and analysis of phenomena, multiple resonances corresponding to the function of stacking the lengths by analyzing the phenomenon in which sound waves return from the additional elements exist in the tube The fact that they have frequencies and their frequencies can be predicted.

Accordingly, an object of the present invention is to solve such a conventional problem, by generating a resonance at the natural frequency of a plurality of sounds constituting the output sound to improve the output and polished the sound smooth sound resonance To provide a resonator with multiple resonant frequencies to produce

The object is, according to the present invention, in the resonator having a multi-resonance frequency is installed in the sound device for outputting sound, the tube is configured to receive the sound at one end; the tube is composed of the sound This is achieved by a resonator having multiple resonant frequencies characterized in that it is bent at at least one bending node spaced from the input end and has a plurality of resonant frequencies.

Here, the separation length from the input end to each bending node may be set to resonate at the natural frequency of the sounds constituting the scale.

In addition, the separation length may substantially correspond to the wavelength of the natural frequency of each sound constituting the musical scale.

In addition, the tubular body may be formed in a curved tube or a straight tube partially between each bending node.

In addition, the tubular body may be formed as a curved tube or a straight tube as a whole between each bending node.

In this case, the scale may be any one of a three-tone scale, a four-tone scale, a five-tone scale, a six-tone scale, a seven-tone scale, an 11-tone scale, and a 12-tone scale.

On the other hand, the object is another aspect of the present invention, the resonator having the multiple resonant frequency; And a housing having a coupling hole formed at a rear side thereof, and an acoustic unit configured to output a sound by varying the pressure of ambient air by the back and forth movement of the diaphragm in the housing, wherein the resonator is coupled to the coupling hole. This is achieved by an acoustic device using a resonator having multiple resonant frequencies.

Here, the acoustic unit is an earphone, and coils are coiled to insert a lead wire for supplying current to the speaker up to the first bending node of the resonator to form a guide hole.

In addition, the acoustic unit is a headphone or a speaker, it can be coiled along the back of the housing up to the first bending node of the resonator.

In addition, the sound unit is a vehicle speaker installed in the door or rear seat deck of the vehicle, the resonator is installed on the inside of the door or the rear seat deck, the resonator is the door or the rear seat so as to absorb the impact during the collision of the vehicle It may be bent to correspond to the left and right length of the deck.

According to the present invention, there is provided a resonator having multiple resonant frequencies for generating resonance at a natural frequency of a plurality of sounds constituting the output sound to improve the output and to polish the sound to produce a smooth resonance sound.

In addition, by providing a resonator having a multi-resonant frequency coupled to the back of the earphone or speaker is provided an acoustic device using a resonator having a multi-resonant frequency that can function as a handle and earphone ornament of the earphone.

In addition, a sound device using a resonator having a multi-resonant frequency absorbing a shock in a vehicle collision is provided by combining a resonator having a multi-resonant frequency and a speaker installed in the door or rear seat deck of the vehicle to act as an impact bar of the vehicle.

Prior to the description, in the various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, different configurations from the first embodiment will be described. do.

Hereinafter, a resonator having multiple resonance frequencies according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a standing wave wavelength diagram of sound waves. Referring to FIG. 2, a standing wave is a wave in which a waveform does not proceed further through a medium but stays at a constant place and vibrates, and a traveling wave and a reflected wave overlap each other and interfere with each other.

At this time, the position where the displacement is maximum in the standing wave is called a loop, and the position where the displacement becomes zero and does not vibrate is called a node.

 3 is a wavelength diagram of sound waves in an open tube, and FIG. 4 is a wavelength diagram of sound waves in a closed tube. Referring to Figures 3 and 4, the wavelength according to the sound wave input into the inside of the tube, the end of the tube is an open end of the air is free to move in the open end is doubled, if the end is closed tube closed end The movement of air in the air is blocked and cannot vibrate, forming a node.

In addition, the tube has a natural frequency determined according to the length of the tube, and when the incoming wave coincides with the natural frequency of the tube, the tube absorbs and vibrates the energy of the wave.

This is called 1: 1 resonance, and the frequency of the wave corresponding to the constant natural frequency of the tube is called the resonance frequency. In other words, it can be said that the tube has a resonant frequency determined according to the length of the tube.

In the case of an open end, the resonator also resonates at 1/2 and a quarter of the resonant frequency, and in the case of a closed end, the frequency is half the resonant frequency. Can resonate.

Thus, when resonance occurs in the tube, when the tube is bent or there is an additional element such as a jaw or branch point or a Helmholtz resonator attachment inside the tube, the sound wave corresponding to the resonance frequency is selectively returned at the point where the additional element is mounted. I will go.

As a result, another resonant frequency is generated which occurs based on the length from the inlet of the tube to the additional element.

That is, as shown in FIG. 5, when the tube is bent once at the point n ₁ , not only the resonance frequency corresponding to the length of L ₁ + L ₂ , which is the total length of the tube, is generated, and n ₁ at the input terminal (a) through which sound waves are input. A resonant frequency corresponding to the length of L _1, the length to the point, is also generated.

Therefore, six resonance frequencies are generated in the tube that is bent once.

L ₁ L ₁ + L ₂ 1: 1 resonance f ₁ f ₂ ½ resonance f _1/2 f _2/2 ¼ resonance f _1/4 f _2/4

As such, one bending point is formed in the tube body, and thus a plurality of resonant frequencies are generated, thereby extending the concept of forming two or more bending points.

6 is a schematic diagram of a resonator having multiple resonant frequencies according to a first embodiment of the present invention. Referring to FIG. 6, a resonator having multiple resonant frequencies according to the first embodiment of the present invention is formed as a tubular body 1 which is formed to be long in one direction and is open at both ends.

Here, the tube 1 is bent at a predetermined angle in at least one bending node spaced apart from the input terminal (a) to which sound is input, and is formed to have a plurality of resonant frequencies, as shown in the first and second bending nodes. It is shown that it is bent at (n ₁ , n ₂ ) to generate three resonant frequencies.

That is, when the tube 1 is bent at the first and second bend nodes n ₁ and n ₂ , the resonance frequency f ₁ is generated in the L ₁ section from the input terminal a to the first bend node n ₁ . In the section L ₁ + L ₂ from the input terminal a to the second bending node n ₂ , a resonance frequency f ₂ is generated, and L ₁ + L ₂ from the input terminal a to the terminal b. In the + L ₃ section, the resonance frequency f ₃ is generated.

As such, the principle of forming a plurality of resonance frequencies through the bending node can be confirmed through a wind instrument.

Except in the case of changing the tube length, a group of wind instruments form a plurality of holes at a predetermined portion, and when a wave is generated with an element (lead) for generating sound waves at one end, the plurality of wind instruments are inputted from the input terminal to which sound waves are input. According to the resonance frequency determined by the length to each hole, a sound wave (tone scale) corresponding to the frequency is generated.

In this concept, the tube 1 according to the present invention may resonate according to the sound waves inputted to the input terminal a from the input terminal a through which sound waves are input to each bending node.

In addition, since both ends are open in the form of an open end from the input terminal a to each bent node, the resonance is not performed even at frequencies of 1/2 and 1/4 of the resonance frequency determined according to the length of the tube 1. Occurs.

As a result, half of each resonant frequency in the L ₁ section, L ₁ + L ₂ section, and L ₁ + L ₂ + L ₃ section by the resonant frequencies f ₁ , f ₂ , and f ₃ generated by the two bending nodes , at 1/4 of the frequency of _{f 1/2, f 2/} 2, f 3/2 and _{f 1/4, f 2/} 4, f 3/4 can be resonant.

On the other hand, the length of the L ₁ section, the length of the L ₁ + L ₂ section, the length of the L ₁ + L ₂ + L ₃ section, which is the separation length from the input node (a) to each bending node, is a three-tone scale, a four-tone scale, One of the various scales, such as the 5-tone scale, the 6-scale scale, the 7-scale scale, and the 12-scale scale, is selected to be set to resonate at the natural frequency of the sounds constituting the scale.

Preferably, the length of the L ₁ section, the length of the L ₁ + L ₂ section, and the length of the L ₁ + L ₂ + L ₃ section are formed to substantially correspond to the wavelength of the natural frequency of each sound constituting the scale. Can be.

That is, the length of the tube may be set to appropriately correspond to the wavelength length of the frequencies of the sounds constituting the scale depending on which scale the input sound is.

In a typical musical scale, one octave lower note is 1/2 of the frequency of the arbitrary sound for any sound, and one octave higher sound is twice the frequency of the arbitrary sound.

That is, if the resonant frequencies f ₁ , f ₂ , and f ₃ generated by the two bending nodes described above are set to the wavelength lengths corresponding to the frequencies of the three sounds constituting the scale, the tubular body set to the three sections is divided into three sections. Branches may resonate at frequencies corresponding to three resonant frequencies, one octave lower and two octaves lower.

Therefore, one resonance frequency can be set to resonate at a corresponding frequency over three octaves.

Fig. 7 is an example of the first embodiment of the present invention, in which the most used 12 scales (12 pure scales or 12 average scales or 12 scales by other tuning methods) are selected and correspond to the wavelength length corresponding to each 12 sounds. It is shown that the tube is bent through eleven bending nodes.

Through this, 12 resonant frequencies are generated, and practically, they can be bent to correspond to the frequencies of the sounds that make up the musical scale, which can be used to generate resonance according to the equal temperament, or just intonation. In some cases, resonance may occur.

The table below shows the length of each section to which 12 frequency wavelength length is applied.

section a ~ n ₁ a ~ n ₂ a ~ n ₃ a ~ n ₄ a ~ n ₅ a ~ n ₆ Wave length length (mm) 433.673 459.459 487.106 515.933 5446.624 579.216 Frequency (Hz) 784 740 698 659 622 587 The sound brush wave# wave beauty re# re

section a ~ n ₇ a ~ n ₈ a ~ n ₉ a ~ n ₁₀ a ~ n ₁₁ a ~ b Wave length length (mm) 613.718 650.096 688.259 729.614 772.727 818.291 Frequency (Hz) 554 523 494 466 440 416 The sound Degree# Degree city la# la brush#

Here, the wavelength is calculated by applying λ = v / f (λ: wavelength, v: sound velocity, f: frequency) by applying approximately 340 m / s, which is a sound wave velocity delivered in 15 ° C. air.

Thus, the tube 1 having 12 resonance frequencies bent to correspond to 12 sounds resonates at a frequency corresponding to 12 sounds, and also resonates at 12 sounds below 1 octave whose frequency is reduced to 1/2, and the frequency is 1 It can also be resonated at 12 notes below 2 octaves down to / 4.

That is, when the resonant frequency is determined as shown in the above table, it may resonate in the corresponding section even at the frequency as shown in the following table.

section a ~ n ₁ a ~ n ₂ a ~ n ₃ a ~ n ₄ a ~ n ₅ a ~ n ₆ 1: 1 resonance (Hz) 784 740 698 659 622 587 ½ resonance (Hz) 382 370 349 329.5 311 293.5 ¼ resonance (Hz) 196 185 174.5 164.8 155.5 146.8 The sound brush wave# wave beauty re# re

section a ~ n ₇ a ~ n ₈ a ~ n ₉ a ~ n ₁₀ a ~ n ₁₁ a ~ b 1: 1 resonance (Hz) 554 523 494 466 440 416 ½ resonance (Hz) 277 261.5 247 233 220 208 ¼ resonance (Hz) 138.5 130.8 123.5 116.5 110 104 The sound Degree# Degree city la# la brush#

That is, based on the octave including 440 Hz, which corresponds to the international pitch, it may resonate at the frequencies of the sounds constituting the 1-octave low scale and the 2-octave low scale.

Through this, a resonator capable of resonating in all notes of three octaves in the 12th scale can be implemented.

8 is an experimental graph of a resonator having multiple resonance frequencies according to a first embodiment of the present invention. Referring to FIG. 8, the experimental group A shows a resonator having 12 resonance frequencies by bending 11 times. The resonance frequencies set to generate 1: 1 resonance are 416 Hz, 440 Hz, 466 Hz, 494 Hz, 523 Hz, and 554 Hz. , 587Hz, 622Hz, 659Hz, 740Hz, 784Hz.

And, control group 1 (B) is shown when there is no resonator, control group 2 (C) is shown when using a straight tube having a resonance frequency of 764 Hz.

The control group 1 (B) is a microphone recorded by generating a pure wave (sine wave) without a resonator as a speaker, the experimental group (A) and the control group 2 (C) generates a pure wave from one end to the speaker, and each resonator provided with the generated sound The decibel (dB) at each frequency of each note is measured by inputting to the input terminal of.

In the experimental group (A) it can be seen that the resonance occurs over the entire range of 400Hz ~ 800Hz to improve the output (dB) compared to the control group (B, C), 200Hz ~ 400Hz and half of the resonance frequency of each section and Resonance occurs in 100Hz ~ 200Hz, which is 1/4 of the resonance frequency of each section, and it can be seen that the output (dB) is improved compared to the control groups.

That is, it can be seen that a higher output (dB) was obtained than the control over the entire period of three octaves.

As described above, the resonator having a multiple resonant frequency of the present invention can be generated over the entire range of 20Hz ~ 20,000Hz of the human audible frequency of the sound generated from the speaker, but is designed to match the speaker unit that generates the sound, As long as the output sound output from the speaker is input to one end, the output sound may be resonated at the intended frequency to improve the output.

In addition, according to the sound output from the sound system, the sound is resonated at frequencies of various scales such as not only 12 scales but also 3 scales, 4 scales, 5 scales, 6 scales, 7 scales, 11 scales, etc. You can set up multiple bending nodes to improve the output.

In addition, by using a resonator having a multiple resonant frequency according to the present invention can overcome the limitation of the output of the sound device itself, it is possible to simply improve the output without adding a separate output enhancer.

In addition, in the case of a speaker which can be generally seen, the volume resonator called an enclosure is physically constrained in the case of sound reproducing equipment such as earphones, headphones, small speakers, automobile speakers, etc. When the resonator is attached, a soft and rich resonant sound can be obtained, thereby improving the listener's hearing.

On the other hand, resonators having multiple resonant frequencies coupled with sound reproducing equipment that are physically limited to attach the volume resonator described above are often limited in physical size and installed space.

At this time, as can be seen in brass instruments such as cornet (cornet) may have a configuration of the shape of the curved pipe bent several times (bending), the shape of the curved pipe has no effect on the resonant frequency characteristics of the resonator.

That is, although the straight pipe is most preferable to the first bending node in this embodiment, as described above, the bending node is not formed in all sections, and the bending of the tubular body itself is independent of the resonance frequency. It may be formed of the same curved tube, may be formed by partially including a curved tube and a straight tube, or may be formed as a straight tube as a whole.

On the other hand, in the present embodiment is given a specific example only for the opening, but if the end is formed of a closed tube to be resonated at 1: 1 resonance frequency and 1/2 resonance frequency may be configured to resonate over two octaves.

Next, a second embodiment of the present invention will be described. 9 is an exploded view of an acoustic device using a resonator having multiple resonant frequencies according to a second embodiment of the present invention, and FIG. 10 is a combined view of FIG. 9.

11 and 12, an acoustic device 1 using a resonator having multiple resonance frequencies according to a second embodiment of the present invention includes a sound unit 10 including a housing 11 and a speaker unit (not shown). And a resonator 20. Here, the sound unit 10 is an earphone.

Inside the housing 11 there is a built-in speaker unit to be described later. Typically, the housing is composed of a front housing and a rear housing are coupled to each other, the speaker unit is installed inside.

In addition, the rear housing 11 is formed with a coupling hole 11a into which the lead wire 12 for supplying current to the speaker unit is inserted.

Here, the speaker unit is a unit for generating a sound built in a conventional earphone, the magnet, voice coil, bobbin, diaphragm, damper and the like is provided, the edge of the diaphragm is fixed to the front housing of the housing 11, the lead wire 13 In accordance with the electrical signal supplied through the) to vibrate back and forth to change the air pressure of the surrounding portion is configured to output sound forward.

The resonator 20 is a resonator having the above-described multiple resonant frequencies. In the present embodiment, the resonator 20 is bent through 11 bending nodes n ₁ , n ₂ , n ₃ ...., N ₁₁ according to 12 scales. interval _{(L 1, L 2, L} 3. ..., L 12) to be described, for example the resonator is formed.

The resonator 20 is coupled to the coupling hole (11a) formed in the rear housing the input end to resonate the sound emitted from the speaker unit.

In addition, the L ₁ section from the coupling hole 11a to the first bending node is formed with a guide hole coiled to guide the lead wire 13 drawn from the rear housing while receiving the lead wire 13 therein.

Here, the L ₁ section forming the guide hole can function as a handle that allows the user to grip the earphone when using the earphone, L ₂ ~ L ₁₂ section can be bent into a suitable shape to improve the aesthetic appearance of bending when bending can function as a decoration.

Through this, it is possible to secure not only the output and hearing improvement of the earphone but also the external aesthetic improvement of the earphone user.

On the other hand, Figure 11 is a first modified example of the second embodiment of the present invention, it is coupled to the back of the earphone housing, it is shown that the resonator having a multiple resonant frequency provided in the shape of the earrings in the L ₁ section up to the first bending node is coupled It is.

At this time, the lead wire 12 is drawn out through the predetermined portion of the housing 11, the input end of the resonator 20 is coupled to the coupling hole (11a) formed in the rear housing.

Fig. 12 shows a second modification of the second embodiment of the present invention in which the acoustic unit is a headphone. The bar shown is only one side of the headphones.

Here, the headphone 10A is also a conventional headphone 10A, and a speaker unit such as the earphone described above is installed inside the housing 10A in which the front and rear housings are mutually coupled.

At this time, a coupling hole (11a) is formed in the rear housing, the resonator group 20 is coupled to the coupling hole (11a).

Here, the L ₁ section to the first bending node of the resonator 20 is coiled along the outer side of the rear housing of the headphone, the section after the L ₁ section to form a predetermined shape as in the earphone described above when bending. It can be bent to improve the overall aesthetics of the headphones.

Fig. 13 shows a third modified example of the second embodiment of the present invention in which the acoustic unit is a desktop speaker 10B. Referring to FIG. 15, a coupling hole is formed in the rear housing of the desktop speaker 10B, and an input terminal of the resonator 20 having multiple resonance frequencies is coupled to the coupling hole.

In this case, the L ₁ section up to the first bending node may be coiled as if enclosing the rear housing and partially straightened vertically downward so that the desktop speaker is spaced at a predetermined distance from the floor.

In addition, the section after the L ₁ section may be bent to serve as a support for supporting the desktop speakers spaced upwardly.

14 shows an application example of the third modification in which the acoustic unit 10c is a satellite speaker of a multichannel speaker of 5 channels or more. Here, in the coupling hole formed in the rear housing L ₁ interval, as shown in another modified example of the resonator is described above is coiled to surround the rear housing, the section after the L ₁ region to form a predetermined shape as in the aforementioned earphone Can be bent to.

15 is a fourth modified example of the second embodiment of the present invention, in which a coupling hole is formed in a rear housing of a speaker 10d installed in a door of a vehicle, and a resonator 20 is coupled to the coupling hole. The bar is shown bent in seven sections (L ₁ ~ L ₂ ).

At this time, the resonator 20 may be fixed by a predetermined fixing means inside the door. An impact bar that absorbs a shock in a vehicle crash is installed inside a typical vehicle door, which is configured to only absorb shock in a crash.

However, by installing the above-described resonator inside the door, it is possible to replace the conventional impact bar as well as to improve the output and hearing of the speaker, so that it is also possible to absorb shock during a collision.

FIG. 16 shows an application of the fourth modified example in which a resonator and a speaker installed in the rear seat deck of the vehicle are combined. Here, the resonator 20 is a resonator that is bent to be divided into 12 sections, is coupled to the coupling hole formed in the rear housing of the speaker 10e, and bent to correspond to the left and right length of the rear seat when the bending is bent by a predetermined fixing means It is fixed to the inside of the deck.

When installed in this way, when the other vehicle collides from the rear, the shock is absorbed through the resonator 20 to ensure the safety of the passengers, it may not be installed a separate impact bar.

Meanwhile, as shown in FIG. 17, a speaker that is an acoustic unit 10 is installed in a rear hatch door of a van, and a resonator 20 is coupled to the speaker to correspond to the left and right lengths of the rear hatch door. If it is fixed to the shock absorber can be absorbed in the crash.

The distal end of the resonator installed in the door, the rear seat deck and the rear hatch of the vehicle described above may be coupled to communicate with the interior of the vehicle, or a separate pipe may be coupled to allow the sound output from the rear of the vehicle speaker to be introduced into the interior.

As described above, by combining a resonator having a multi-resonant frequency, such as speakers and earphones can improve the output and sound, as well as to improve the visual aesthetics of the earphones or speakers and to ensure the safety of the passengers.

The scope of the present invention is not limited to the above-described embodiment, but may be embodied in various forms of embodiments within the scope of the appended claims. Without departing from the gist of the invention claimed in the claims, it is intended that any person skilled in the art to which the present invention pertains falls within the scope of the claims described in the present invention to various extents which can be modified.

1 is a relationship between the height of the sound and the octave,

2 is a standing wave wavelength diagram of sound waves;

3 is a wavelength diagram of sound waves in an overview;

4 is a wavelength diagram of sound waves in a closed tube

5 is a schematic diagram of a bent tube,

6 is a schematic diagram of a resonator having multiple resonant frequencies according to a first embodiment of the present invention;

7 is a schematic diagram of a resonator having multiple resonant frequencies in accordance with an example of the first embodiment of the present invention;

8 is an experimental graph of a resonator having multiple resonance frequencies according to a first embodiment of the present invention;

9 is an exploded view of an acoustic device using a resonator having multiple resonant frequencies according to a second embodiment of the present invention;

10 is a coupling diagram of FIG. 9,

11 is a schematic diagram of an acoustic device using a resonator having multiple resonant frequencies according to a first modification of the second embodiment of the present invention;

12 is a schematic diagram of an acoustic device using a resonator having multiple resonance frequencies according to a second modification of the second embodiment of the present invention;

13 is a schematic diagram of an acoustic device using a resonator having multiple resonant frequencies according to a third modification of the second embodiment of the present invention;

14 is a schematic diagram of an acoustic device using a resonator having multiple resonant frequencies according to an application example of the third modification of the second embodiment of the present invention;

15 is a schematic diagram of an acoustic device using a resonator having multiple resonant frequencies according to a fourth modification of the second embodiment of the present invention;

16 and 17 are schematic diagrams of an acoustic device using a resonator having multiple resonant frequencies according to an application example of the fourth modified example of the second embodiment of the present invention.

<Description of reference numerals used in drawings>

10: sound unit 11: housing 11a: coupling hole

12: lead wire

Claims (10)

In a resonator having multiple resonant frequencies installed in an acoustic device for outputting sound, Consists of a pipe (pipe body) that the sound is input to one end, The tubular body is bent at at least one bending node spaced apart from an input terminal to which the sound is input, and is formed to have a plurality of resonant frequencies. And a separation length from the input end to each bending node is set to be resonant at a natural frequency of the sounds constituting the scale. delete The method of claim 1, The separation length is a resonator having a multiple resonant frequency, characterized in that substantially corresponding to the wavelength of the natural frequency of each sound constituting the scale. The method of claim 1, The tube is a resonator having a multiple resonant frequency, characterized in that formed in a curved tube or a straight tube between each bending node. The method of claim 1, The tube is a resonator having a multiple resonant frequency, characterized in that formed as a curved tube or a straight tube as a whole between each bending node. The method of claim 1, The scale is a three-tone scale, four-tone scale, five-tone scale, six-tone scale, seven-tone scale, 11-tone scale and 12-tone scale, characterized in that the resonator having a multiple resonance frequency. Resonators having a multiple resonant frequency according to any one of claims 1 to 3; And a housing in which a coupling hole is formed at a rear side, and an acoustic unit for outputting sound by changing the pressure of ambient air by the back and forth movement of the diaphragm in the housing. The resonator is a sound device using a resonator having a multiple resonant frequency, characterized in that coupled to the coupling hole. The method of claim 7, wherein The acoustic unit is an earphone, and coils are coiled to insert a lead wire for supplying current to the acoustic unit up to the first bending node of the resonator to form a guide hole, using a resonator having multiple resonant frequencies. Sound system. The method of claim 7, wherein The acoustic unit is a headphone or a speaker, the sound device using a resonator having multiple resonant frequency, characterized in that coiled along the back of the housing to the first bending node of the resonator. The method of claim 7, wherein The acoustic unit is a vehicle speaker installed in the door or the rear seat deck of the vehicle, the resonator is installed inside the door or the rear seat deck, the resonator is the resonator of the door or the rear seat deck to absorb the impact in the event of a vehicle collision A sound device using a resonator having multiple resonant frequencies, characterized in that bent to correspond to the left and right length.

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