WO2015064871A1

WO2015064871A1 - Sound generation device

Info

Publication number: WO2015064871A1
Application number: PCT/KR2014/004417
Authority: WO
Inventors: 이영주; 이정수
Original assignee: 엘지전자 주식회사
Priority date: 2013-11-01
Filing date: 2014-05-16
Publication date: 2015-05-07
Also published as: KR20150050829A

Abstract

The present invention relates to a sound generation device having a graphene diaphragm, comprising: a diaphragm; and a driving unit for supporting the surroundings of the diaphragm and vibrating the diaphragm by generating a magnetic field proportional to an inputted current, wherein the diaphragm includes a graphene layer, and a curved direction of the diaphragm can be determined according to a magnetic field direction of the driving unit. Here, the driving unit can comprise: a first support frame for supporting the upper surface of the diaphragm; a second support frame for supporting the lower surface of the diaphragm; and a conductive coil surrounding the outer side surfaces of the first and second support frames, or the driving unit can comprise: a first support frame for supporting the upper surface of the diaphragm; a second support frame for supporting the lower surface of the diaphragm; a first fixed armature disposed on the first support frame; a second fixed armature disposed on the second support frame; a magnetic core structure for connecting one side of the first and second fixed armatures; and a conductive coil surrounding the outer surface of the magnetic core structure.

Description

Sound generator

The present invention relates to an acoustic generator, and more particularly, to an acoustic generator having a graphene diaphragm.

In general, a sound generating device such as a speaker is a device for converting an electrical signal into a voice signal, and has been applied to various acoustic devices such as earphones, mobile phones, MP3 players, and the like.

Such a speaker uses various driving methods, such as a voice coil driving method, a balanced armature driving method, an electrostatic driving method, and the like.

Here, the speaker using the voice coil drive system is a winding coil and a permanent magnet to drive the vibrating membrane, and while the price is low, there is a problem that the high frequency characteristics are not good.

In addition, the speaker using the balanced armature driving method is a method of driving the vibrating membrane by a displacement proportional to the magnetization of the balanced armature. However, the speaker can be miniaturized, but there is a problem that the high frequency characteristics are poor and the price is relatively expensive.

Subsequently, the speaker using the electrostatic driving method has a problem that the high frequency characteristic is good as the method of driving the vibrating membrane by the electric field change, while the low frequency characteristic is not good, and the speaker is driven at a high voltage of about 100 V or more.

1 is a cross-sectional view showing a speaker using an electrostatic driving method.

As shown in FIG. 1, the speaker may be composed of the first and second fixed electrodes 1a and 1b and the vibrating membrane 2, and a high alternating current is applied to the first and second fixed electrodes 1a and 1b. When a voltage is applied, the vibrating membrane 2 vibrates due to electric force between charges.

Here, the 1st, 2nd fixed electrode 1a, 1b can be arrange | positioned facing each other, and the diaphragm 2 can be arrange | positioned between them.

In this case, the vibrating membrane 2 is coated with a metal on a thin film of plastic, and may have a thickness of about 10-20 μm.

When a high alternating current voltage is applied to the first and second fixed electrodes 1a and 1b to form an electrostatic field, and then a voice signal is applied to the primary side of the modulation transformer 3, the voltage fluctuations are interrupted. By generating the following fluctuations, the vibration membrane 2 and the first and second fixed electrodes 1a and 1b can be converted into sound by the principle of being pushed and pulled.

Here, the vibrating membrane 2 is formed by coating a metal on a thin film of plastic. The vibrating membrane 2 has a thickness of about 10-20 μm, and is very thin, so that a delicate sound range, particularly a high frequency sound range, can be reproduced well.

However, there is still a problem that the low frequency characteristics are not good and are driven at a high voltage of about 100V or more.

Therefore, in the future, the development of a speaker capable of minimizing the distortion of sound quality by minimizing the thickness of the vibrating membrane to improve not only high frequency characteristics but also low frequency characteristics is required.

It is an object of the present invention to solve the above and other problems. It is another object of the present invention to provide a sound generating device capable of realizing distortion-free and high sound quality with a low driving voltage using a graphene acoustic vibration membrane.

According to an aspect of the present invention to achieve the above or another object, the vibration membrane and the driving unit for supporting the periphery of the vibration membrane, generating a magnetic field proportional to the input current, vibrating the vibration membrane, the vibration membrane, It includes a graphene layer, the bending direction can be determined according to the magnetic field direction of the drive unit.

Here, the vibrating membrane may include a substrate and a graphene layer disposed on the substrate.

The graphene layer may be a graphene single layer or a graphene plural layer.

In some cases, an organic layer may be formed between the substrate and the graphene layer.

Here, in the graphene layer and the organic layer, one or more organic layers and one or more graphene layers may be alternately formed to form an organic-inorganic composite layer.

In addition, a protective film in contact with at least one surface of the graphene layer and the substrate may be formed.

The driving unit may include a first support frame supporting the upper surface of the vibration membrane, a second support frame supporting the lower surface of the vibration membrane, and a conductive coil surrounding the outer surfaces of the first and second support frames. have.

Here, the first support frame is disposed along the peripheral region of the upper surface of the vibrating membrane, and includes a first through hole exposing the central region of the upper surface of the vibrating membrane, and the second supporting frame includes a peripheral portion of the lower surface of the vibrating membrane. A second through hole may be disposed along the region and expose a central region of the lower surface of the vibrating membrane.

Subsequently, the inner surfaces of the first and second support frames may be inclined with respect to the surface of the vibrating membrane, and the angle between the inner surfaces of the first and second supporting frames and the surface of the vibrating membrane may be an obtuse angle.

Next, the number of times of winding the outer side of the first support frame and the number of times of winding the outer side of the second support frame may be the same as that of the conductive coil.

The driving unit includes a first support frame for supporting the upper surface of the vibration membrane, a second support frame for supporting the lower surface of the vibration membrane, a first stator armature disposed on the first support frame, and a second It may include a second fixed armature disposed on the support frame, a magnetic core structure connecting one side of the first fixed armature and the second fixed armature, and a conductive coil surrounding the outer surface of the magnetic core structure.

Here, the first fixed armature has a peripheral region in contact with the first support frame, the central region is disposed at a first distance from the upper surface of the vibrating membrane, and the second fixed armature has a peripheral region in contact with the second support frame. The central region may be disposed apart from the lower surface of the vibrating membrane at a second interval.

Subsequently, a plurality of holes may be formed in the central region of the first fixed armature and the central region of the second fixed armature.

In addition, the conductive coils may be arranged to be spaced apart from the outer surfaces of the first and second support frames at a predetermined interval.

The vibrating membrane may generate an internal magnetic field by an external magnetic field generated from the driver, and the direction of the internal magnetic field of the vibrating membrane may be opposite to the direction of the external magnetic field generated by the driver.

Referring to the effects of the sound generating apparatus according to the present invention.

According to at least one of the embodiments of the present invention, by using the graphene acoustic vibration membrane, it is possible to minimize the thickness of the vibration membrane, and by driving the graphene acoustic vibration membrane in an electromagnetic drive method, there is an advantage that can be driven at a low voltage.

Therefore, the present invention can realize the best sound quality while minimizing distortion of sound quality with a low driving voltage.

Further scope of the applicability of the present invention will become apparent from the following detailed description. However, various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, and therefore, specific embodiments, such as the detailed description and the preferred embodiments of the present invention, should be understood as given by way of example only.

2 is a view schematically showing a sound generating apparatus according to the present invention.

3 and 4 are views illustrating a driving principle of the vibrating membrane of FIG. 2.

5 to 9 are cross-sectional views showing the structure of the vibration membrane of FIG.

FIG. 10 is a cross-sectional view illustrating the driving unit of FIG. 2 according to the first embodiment. FIG.

FIG. 11 is a cross-sectional view illustrating the supporting frame of FIG. 10.

12 to 14 are cross-sectional views illustrating the conductive coil of FIG. 10.

FIG. 15 is a cross-sectional view illustrating a driving part of FIG. 2 according to a second embodiment. FIG.

FIG. 16 is a cross-sectional view illustrating the supporting frame of FIG. 15.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and the same or similar components are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used in consideration of ease of specification, and do not have distinct meanings or roles from each other. In addition, in describing the embodiments disclosed herein, when it is determined that the detailed description of the related known technology may obscure the gist of the embodiments disclosed herein, the detailed description thereof will be omitted. In addition, the accompanying drawings are intended to facilitate understanding of the embodiments disclosed herein, but are not limited to the technical spirit disclosed herein by the accompanying drawings, all changes included in the spirit and scope of the present invention. It should be understood to include equivalents and substitutes.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

As shown in FIG. 2, the vibration membrane 100 and the driving unit 200 may be included.

Here, the vibrating membrane 100 may include a graphene layer, the bending direction may be determined according to the magnetic field direction of the driving unit 200.

As such, the reason why the vibrating membrane 100 is formed of graphene is because the mechanical rigidity of the graphene is high, so that the vibrating membrane 100 may be manufactured to have a very thin thickness.

When the thickness of the vibrating membrane 100 is reduced, the spring constant k related to the driving direction of the vibrating membrane 100 is lowered and the sound quality distortion can be lowered so that the mass m of the vibrating membrane itself can be negligible. The phenomenon can be greatly reduced, and sound can be accurately reproduced.

Therefore, the thickness t1 of the vibration membrane 100 may be manufactured to about several nm-about several tens of nm.

For example, the thickness t1 of the vibration membrane 100 may be about 10 nm to about 600 nm, but is not limited thereto.

The vibrating membrane 100 may include a substrate and a graphene layer disposed on the substrate.

Here, in the graphene layer, a plurality of carbon atoms are covalently linked to each other, the graphene to form a polycyclic aromatic molecule may be formed in the form of a film or sheet.

In this case, the carbon atoms connected by covalent bonds, as a basic repeating unit, forms a 6-membered ring, but may further include a 5-membered and / or 7-membered.

In addition, the graphene layer may be, but is not limited to, a graphene monolayer or a graphene plural layer.

As another example, the graphene layer and the organic layer may be formed by alternately forming one or more organic layers and one or more graphene layers, respectively, to form an organic-inorganic composite layer.

The reason why the organic layer is formed is because the surface strength of the vibrating membrane 100 is increased, the moisture absorption barrier property is excellent, and the life of the vibrating membrane 100 can be extended.

As another case, a protective film in contact with at least one surface of the graphene layer and the substrate may be formed.

The reason for forming the protective film is to protect the graphene layer from external impact.

For example, the protective layer may be selected from the group consisting of PEDOT (poly (3,4-ethylenedioxythiophene)), thiophene polymer, polypyrrole, polyaniline, polyvinylidene fluoride (PVDF), PZT, and combinations thereof, but is not limited thereto. Does not.

In addition, the vibrating membrane 100 may generate an internal magnetic field by an external magnetic field generated from the driving unit 200.

Therefore, the direction of the internal magnetic field of the vibrating membrane 100 may be opposite to the direction of the external magnetic field generated from the driver 200.

As an example, when the direction of the external magnetic field generated from the driver 200 is in the upper direction, the direction of the internal magnetic field of the vibrating membrane 100 may be generated in the lower direction.

In addition, when the direction of the external magnetic field generated from the driving unit 200 is in the lower direction, the direction of the internal magnetic field of the vibration membrane 100 may be generated in the upper direction.

Therefore, due to the interaction force between the direction of the internal magnetic field of the vibrating membrane 100 and the direction of the external magnetic field generated from the driving unit 200, the bending direction of the vibrating membrane 100 may be the upper or lower direction. .

As described above, the vibrating membrane 100 may vibrate by the interaction force between the direction of the internal magnetic field of the vibrating membrane 100 and the direction of the external magnetic field of the driving unit 200.

Here, the amplitude of the vibration membrane 100 may be determined by the interaction force between the strength of the internal magnetic field of the vibration membrane 100 and the strength of the external magnetic field of the driving unit 200.

Next, the driving unit 200 may support the periphery of the vibrating membrane 100, generate a magnetic field proportional to the input current, and vibrate the vibrating membrane 100.

Here, the driving part 200 may include a support part 210 supporting a peripheral part of the vibrating membrane 100.

The support part 210 may be disposed at the periphery of the upper surface of the vibrating membrane 100 and the periphery of the lower surface of the vibrating membrane 100, and may expose the central portion of the vibrating membrane 100 to the outside.

In addition, the support unit 210 may be formed of a material capable of transmitting a magnetic field generated by the driving unit 200.

In some cases, the support unit 210 may be made of an insulating material through which the magnetic field generated by the driver 200 is not transmitted.

Subsequently, the driving unit 200 may be manufactured in various structures having an electromagnetic driving method.

In one embodiment, the driving unit 200 may include a first, a second support frame and a conductive coil.

Here, the first support frame can support the upper surface of the vibration membrane, and the second support frame can support the lower surface of the vibration membrane.

In this case, the first support frame may be disposed along a peripheral area of the upper surface of the vibrating membrane 100, and may include a first through hole exposing a central area of the upper surface of the vibrating membrane 100.

In addition, the second support frame may include a second through hole disposed along a peripheral area of the lower surface of the vibrating membrane 100 and exposing a central area of the lower surface of the vibrating membrane 100.

The conductive coils may be arranged to surround outer surfaces of the first and second support frames.

Therefore, when a current corresponding to the acoustic signal is applied, the driving unit 200 may induce a magnetic field inside the first and second support frames in which the conductive coil is wound.

Here, the direction of the magnetic field induced inside the first and second support frames may be determined according to the direction of the current input to the conductive coil.

As another case, the drive unit 200 may include a first and a second support frame, a first and a second stationary armature, a magnetic core structure, and a conductive coil.

In this case, the first and second support frames may be insulators.

And, the first fixed armature may be disposed on the first support frame, and the second fixed armature may be disposed on the second support frame.

Subsequently, the magnetic core structure may connect one side of the first fixed armature and the second fixed armature, and the conductive coil may be disposed to surround the outer surface of the magnetic core structure.

In addition, a plurality of holes may be formed in the central region of the first fixed armature and the central region of the second fixed armature.

Therefore, when a current corresponding to the acoustic signal is applied, the driving unit 200 may generate a magnetic field between the connected first and second fixed armatures through the magnetic core structure in which the conductive coil is wound.

As such, the vibration membrane 100 may be determined by the driving unit 200 configured according to the magnetic field direction and the intensity generated from the driving unit 200.

As such, the present invention can minimize the thickness of the vibration membrane by using the graphene acoustic vibration membrane, and drive the graphene acoustic vibration membrane by an electromagnetic driving method, thereby driving at a low voltage.

As shown in FIG. 3 and FIG. 4, the vibrating membrane may include a graphene layer 110.

Here, in the graphene layer 110, a plurality of carbon atoms are covalently connected to each other, the graphene to form a polycyclic aromatic molecule may be formed in a film or sheet form.

The graphene layer 110 may generate an internal magnetic field by an external magnetic field.

This is because the lattice structure of the graphene layer 110 has a lattice structure similar to the benzene ring.

That is, the induction current ig may be generated in the graphene layer 110 having a lattice structure similar to that of the benzene ring by the external magnetic field Bo, and the internal magnetic field Bg may be generated in the graphene layer 110 by the induction current ig.

Therefore, the external magnetic field Bo and the internal magnetic field Bg of the graphene layer 110 may generate displacement in the vibrating membrane including the graphene layer by an interaction force.

The sound pressure may be generated in proportion to the displacement of the vibration membrane.

That is, according to the present invention, since the size of the internal magnetic field induced in the vibrating membrane including the graphene layer is changed according to the size of the external magnetic field, the displacement of the vibrating membrane can be controlled by adjusting the size of the external magnetic field, so that the acoustic control It is possible.

Here, the direction of the internal magnetic field of the graphene layer 110 may be opposite to the direction of the external magnetic field.

For example, as shown in FIG. 3, when the direction of the external magnetic field Bo is upward, the induced current ig induced in the graphene layer 110 is generated in a clockwise direction on the plane, and the graphene layer 110 is induced by the induced current ig. The direction of the internal magnetic field Bg of) may be generated in the downward direction.

In addition, as shown in FIG. 4, when the direction of the external magnetic field Bo is downward, the induced current ig induced in the graphene layer 110 is generated counterclockwise on the plane, and the graphene layer 110 is induced by the induced current ig. The direction of the internal magnetic field Bg of, may be generated in the upper direction.

Therefore, due to the interaction force between the direction of the internal magnetic field of the graphene layer 110 and the direction of the external magnetic field, the bending direction of the vibration membrane may be the upper or lower direction.

Thus, the vibrating membrane can vibrate by the interaction force between the direction of the inner magnetic field of the vibrating membrane and the direction of the outer magnetic field.

Here, the amplitude of the vibration membrane can be determined by the interaction force between the strength of the internal magnetic field of the vibration membrane and the strength of the external magnetic field.

5 to 9 are cross-sectional views showing the structure of the vibration membrane of Figure 2, Figure 5 is a vibration membrane according to the first embodiment, Figure 6 is a vibration membrane according to the second embodiment, Figure 7 is a third embodiment 8 is a vibration membrane according to the fourth embodiment, and FIG. 9 is a vibration membrane according to the fifth embodiment.

As shown in FIG. 5, the vibrating membrane 100 according to the first embodiment may include a substrate 10 and a graphene layer 120 disposed on the substrate 110.

Here, the substrate is a polyethylene terephthalate (PET), polypropylene (PP), polymethyl methacrylate (PMMA), polycarbonate (PC), polyether sulfone (PES), It may be selected from the group consisting of polyvinylchloride (PVC), polypyrrole, polyimide, polyethylene (PE) and combinations thereof, but is not limited thereto.

In addition, in the graphene layer 120, a plurality of carbon atoms are covalently linked to each other, and thus, graphene, which forms polycyclic aromatic molecules, may be formed in a film or sheet form.

6, the vibrating membrane 100 according to the second embodiment may include a substrate 110 and a graphene layer 120 disposed on the substrate 110.

Here, the graphene layer 120 may be formed by stacking the first graphene layer 122 and the second graphene layer 124.

That is, the graphene layer 120 may be formed of a single graphene layer, but in some cases, may be formed of a plurality of graphene layers.

The vibrating membrane 100 including the graphene plural layers may have better mechanical rigidity 120 than the vibrating membrane 100 including the graphene single layer.

As shown in FIG. 7, the vibrating membrane 100 according to the third embodiment includes a substrate 110 and a graphene layer 120 disposed on the substrate 110. The organic layer 130 may be further formed between the graphene layers 120.

In addition, as shown in FIG. 7, the vibration membrane 100 according to the fourth embodiment may include a substrate 110 and a graphene layer 120 disposed on the substrate 110.

In addition, an organic layer 130 may be further formed between the substrate 110 and the first graphene layer 122 and between the first graphene layer 122 and the second graphene layer 124.

As such, the graphene layer 120 and the organic layer 130 may have one or more organic layers 130 and one or more graphene layers 120 alternately formed to form an organic-inorganic composite layer.

The reason why the organic layer 130 is formed is because the surface strength of the vibration membrane 100 is increased, the moisture absorption barrier property is excellent, and the life of the vibration membrane 100 can be extended.

As another case, as shown in FIG. 9, the vibrating membrane 100 according to the fifth embodiment includes a substrate 110 and a graphene layer 120 disposed on the substrate 110, and the graphene layer A protective layer 140 may be formed to contact at least one surface of the 120 and the substrate 110.

Here, the reason for forming the protective film 140 is to protect the graphene layer 120 from an external impact.

As such, the vibration membrane of the present invention including the graphene layer may be manufactured in various structures.

As shown in FIG. 10, the driving unit 200 may include first and second support frames 220 and 230 and a conductive coil 240.

Here, the first support frame 220 may support the upper surface 101 of the vibrating membrane 100.

The second support frame 230 may support the lower surface 102 of the vibrating membrane 100.

In this case, the first support frame 220 is disposed along the peripheral region of the upper surface 101 of the vibrating membrane 100, and exposes a first through hole exposing the central region of the upper surface 101 of the vibrating membrane 100. 221).

In addition, the second support frame 230 is disposed along the peripheral region of the lower surface 102 of the vibration membrane 100, and exposes a second through hole exposing the central region of the lower surface 102 of the vibration membrane 100. 231).

For example, the first and second support frames 220 and 230 may be bobbins.

The conductive coil 240 may be disposed to surround the outer side surface 224 of the first support frame 220 and the outer side surface 234 of the second support frame 230.

Subsequently, the inner side surface 222 of the first support frame 220 may be perpendicular to the upper surface 101 of the vibrating membrane 100.

In addition, the inner surface 232 of the second support frame 230 may be perpendicular to the lower surface 102 of the vibration membrane 100.

In some cases, the inner surface 222 of the first support frame 220 may be inclined with respect to the upper surface 101 of the vibrating membrane 100, and the inner surface 232 of the second support frame 230 may be inclined. ) May be inclined with respect to the lower surface 102 of the vibrating membrane 100.

In addition, the number of times of winding the outer surface 224 of the first support frame 220 and the number of times of winding the outer surface 234 of the second support frame 230 may be the same as the conductive coil 240. .

However, in some cases, the number of times that the conductive coil 240 is wound around the outer surface 224 of the first support frame 220 and the number of times that the outer surface 234 of the second support frame 230 is wound It may be different.

Therefore, when a current corresponding to the acoustic signal is applied, the driving unit 200 may induce a magnetic field inside the first and second support frames 220 and 230 in which the conductive coil 240 is wound.

Here, the direction of the magnetic field induced inside the first and second support frames 220 and 230 may be determined according to the direction of the current input to the conductive coil 240.

That is, when the current i corresponding to the sound signal to be output is input to the conductive coil 240 of the driving unit 200, the first and second external magnetic fields proportional to the input current i are wound by the conductive coil 240. It may be organic in the support frame (220, 230).

In the vibrating membrane 100 including the graphene layer, an induced current may be induced by an external magnetic field, and a diamagnetic magnetic field may be generated inside the vibrating membrane 100 by the induced current.

Subsequently, due to the interaction force between the external magnetic field and the internal diamagnetic magnetic field, the vibration membrane 100 may be displaced and vibrate up and down.

Therefore, a sound pressure may be generated in proportion to the displacement of the vibrating membrane 100.

FIG. 11 is a cross-sectional view illustrating the supporting frame of FIG. 10.

As illustrated in FIG. 11, the driving unit 200 may include first and second support frames 220 and 230 and a conductive coil 240.

Here, the first support frame 220 may support the upper surface 101 of the vibrating membrane 100, and the second support frame 230 supports the lower surface 102 of the vibrating membrane 100. can do.

In this case, the inner surface 222 of the first support frame 220 may be inclined with respect to the upper surface 101 of the vibrating membrane 100, and the inner surface 232 of the second support frame 230 may be inclined. , With respect to the lower surface 102 of the vibrating membrane 100.

For example, the inner side surface 222 of the first support frame 220 may be inclined at a first angle θ1 with respect to the upper surface 101 of the vibrating membrane 100.

The inner side surface 232 of the second support frame 230 may be inclined at a second angle θ2 with respect to the lower side surface 102 of the vibrating membrane 100.

Here, the first angle θ1 and the second angle θ2 may be the same, but may be different from each other in some cases.

Also, the first angle θ1 and the second angle θ2 may be obtuse angles.

As such, the reason why the first angle θ1 and the second angle θ2 are obtuse angles is to allow the generated sound to be better diffused to the outside by the displacement of the vibration membrane 100.

Subsequently, the rest of the configuration is the same as that of the driving unit of the first embodiment of the present invention, and thus detailed description thereof will be omitted.

12 to 14 are cross-sectional views illustrating the conductive coil of FIG. 10.

12 to 14, the conductive coil 240 may be disposed to surround the outer side surface 224 of the first support frame 220 and the outer side surface 234 of the second support frame 230. Can be.

Here, as shown in FIG. 12, the conductive coil 240 includes a first conductive coil 241 winding the outer surface 224 of the first support frame 220 and an outer surface 234 of the second support frame 230. ) May include a second conductive coil 242 wound.

The number of turns of the first conductive coil 241 winding the outer side surface 224 of the first support frame 220 and the second conductive coil 242 winding the outer side surface 234 of the second support frame 230. ), The number of turns may be the same.

In some cases, as shown in FIGS. 13 and 14, the conductive coil 240 may be wound around the outer surface 224 of the first support frame 220 and the outer surface 234 of the second support frame 230. ) The number of turns may be different.

For example, as shown in FIG. 13, the number of turns of the first conductive coil 241 wound around the outer surface 224 of the first support frame 220 may wind the outer surface 234 of the second support frame 230. It may be less than the number of turns of the second conductive coil 242.

In addition, as shown in FIG. 14, the number of windings of the first conductive coil 241 winding the outer surface 224 of the first supporting frame 220 may be the winding of the outer surface 234 of the second supporting frame 230. The number of turns of the two conductive coils 242 may be greater.

In this way, the number of turns of the first conductive coil 241 winding the outer surface 224 of the first support frame 220 and the second conductive coil winding the outer surface 234 of the second support frame 230 ( The number of turns of 242 may affect the strength of the internal magnetic field of the vibrating membrane, and may also affect the displacement of the vibrating membrane.

Therefore, based on the number of turns of the conductive coil, it is possible to adjust and correct the sound output.

As shown in FIG. 15, the driving unit 200 includes first and second support frames 250 and 260, first and second

fixed armatures

290a and 290b, magnetic core structure 270, and a conductive coil 280. ) May be included.

Here, the first support frame 250 may support the upper surface 101 of the vibrating membrane 100.

In addition, the second support frame 260 may support the lower surface 102 of the vibrating membrane 100.

Here, the first and second support frames 250 and 260 may be insulators.

In addition, the inner surface 252 of the first support frame 250 may be perpendicular to the upper surface 101 of the vibration membrane 100.

The inner surface 262 of the second support frame 260 may be perpendicular to the lower surface 102 of the vibrating membrane 100.

In some cases, the inner surface 252 of the first support frame 250 may be inclined with respect to the upper surface 101 of the vibrating membrane 100, and the inner surface 262 of the second support frame 260 may be inclined. ) May be inclined with respect to the lower surface 102 of the vibrating membrane 100.

Next, the first fixed armature 290a may be disposed on the first support frame 250, and the second fixed armature 290b may be disposed on the second support frame 260.

Subsequently, the magnetic core structure 270 may connect one side of the first fixed armature 290a and the second fixed armature 290b.

That is, one end of the magnetic core structure 270 may be connected to one end of the first fixed armature 290a, and the other end of the magnetic core structure 270 may be connected to one end of the second fixed armature 290b. .

In addition, the conductive coil 280 may be disposed to surround the outer surface of the magnetic core structure 270.

The conductive coils 280 may be spaced apart from the outer surfaces of the first and second support frames 250 and 260 at predetermined intervals.

That is, the conductive coils 280 may be disposed at regular intervals from the outer surface 254 of the first support frame 250, and may be spaced apart from the outer surface 264 of the second support frame 260 at regular intervals. Can be arranged.

Next, the first fixed armature 290a may have a peripheral area in contact with the first support frame 250 and a central area may be disposed at a first interval from the upper surface 101 of the vibrating membrane 100.

In addition, the second fixed armature 290b may have a peripheral area in contact with the second support frame 260, and a central area of the second fixed armature 290b spaced apart from the lower surface 102 of the vibrating membrane 100 at a second interval.

Here, the first interval and the second interval may be identical to each other, but may be different from each other in some cases.

In addition, a plurality of holes 300 may be formed in the central region of the first fixed armature 290a and the central region of the second fixed armature 290b.

Here, the size of the hole 300 formed in the center region of the first fixed armature 290a and the size of the hole 300 formed in the center region of the second fixed armature 290b may be the same. In some cases, they may be different.

In addition, the size of the hole 300 may increase gradually from the central area of the first fixed armature 290a to the edge area, and the hole (rear) from the central area of the second fixed armature 290b to the edge area. The size of 300 may be gradually increased.

The reason is to make the intensity of the sound pressure output to the outside through the hole 300 uniform.

For example, since the sound pressure generated in the center region of the vibrating membrane 100 is greater than the sound pressure generated in the edge region of the vibrating membrane 100, a hole located above the center region of the vibrating membrane 100 ( By decreasing the size of 300 and increasing the size of the hole 300 located above the edge region of the vibrating membrane 100, the intensity of the sound pressure output to the outside through the hole 300 may be uniform throughout. .

Accordingly, when the current i corresponding to the acoustic signal is applied, the driving unit 200 connects the first and second

fixed armatures

290a and 290b through the magnetic core structure 270 in which the conductive coil 280 is wound. A magnetic field can be generated in between.

Here, the direction of the magnetic field generated between the first and second

fixed armatures

290a and 290b may be determined according to the direction of the current input to the conductive coil 280.

That is, when the current i corresponding to the acoustic signal to be output is input to the conductive coil 280 of the driving unit 200, an external magnetic field proportional to the input current i is connected through the magnetic core structure 270. It can be generated between the second fixed armature (290a, 290b).

FIG. 16 is a cross-sectional view illustrating the supporting frame of FIG. 15.

As shown in FIG. 16, the driving unit 200 includes the first and second support frames 250 and 260, the first and second

fixed armatures

290a and 290b, the magnetic core structure 270, and the conductive coil 280. ) May be included.

Here, the first support frame 250 may support the upper surface 101 of the vibrating membrane 100, and the second support frame 260 supports the lower surface 102 of the vibrating membrane 100. can do.

In this case, the inner surface 252 of the first support frame 250 may be inclined with respect to the upper surface 101 of the vibrating membrane 100, and the inner surface 262 of the second support frame 260 may be inclined. , With respect to the lower surface 102 of the vibrating membrane 100.

For example, the inner side surface 252 of the first support frame 250 may be inclined at a first angle θ1 with respect to the upper surface 101 of the vibrating membrane 100.

The inner side surface 262 of the second support frame 260 may be inclined at a second angle θ2 with respect to the lower surface 102 of the vibrating membrane 100.

Also, the first angle θ1 and the second angle θ2 may be obtuse angles.

Subsequently, the rest of the configuration is the same as that of the driving unit of the second embodiment of the present invention, and thus detailed description thereof is omitted.

Thus, the present invention is configured, by using the graphene acoustic vibration membrane can minimize the thickness of the vibration membrane, by driving the graphene acoustic vibration membrane by the electromagnetic drive method, it is possible to drive at a low voltage.

The sound generating apparatus according to the present invention is not limited to the configuration and method of the embodiments described as described above, but the embodiments are a combination of all or part of each embodiment selectively so that various modifications can be made. It may be configured.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

The present invention relates to an acoustic generator having a graphene diaphragm. Therefore, the present invention has industrial applicability.

Claims

Vibration membrane; And,

And a driving unit supporting the periphery of the vibrating membrane and generating a magnetic field proportional to an input current to vibrate the vibrating membrane.

The vibration membrane,

Including a graphene layer,

The bending direction is determined according to the magnetic field direction of the drive unit.
The vibration membrane of claim 1,

Board;

A sound generating device comprising a graphene layer disposed on the substrate.
The method of claim 2, wherein the graphene layer,

An acoustic generator, characterized in that the graphene monolayer or graphene plural layers.
According to claim 2, Between the substrate and the graphene layer,

An acoustic generator, characterized in that the organic layer is formed.
The method of claim 4, wherein the graphene layer and the organic layer,

The at least one organic layer and at least one graphene layer are formed alternately to form an organic-inorganic composite layer.
The sound generating device according to claim 2, wherein a protective film is formed in contact with at least one surface of the graphene layer and the substrate.
The method of claim 6, wherein the protective film,

A sound generating device selected from the group consisting of poly (3,4-ethylenedioxythiophene) (PEDOT), thiophene-based polymer, polypyrrole, polyaniline, polyvinylidene fluoride (PVDF), PZT and combinations thereof.
The method of claim 2, wherein the substrate,

Polyethylene terephthalate (PET), polypropylene (PP), polymethylmethacrylate (PMMA), polycarbonate (PC), polyethersulfone (PES), polyvinylchloride : PVC), polypyrrole, polyimide, polyethylene (PE), and a combination thereof.
The method of claim 1, wherein the driving unit,

A first support frame supporting an upper surface of the vibrating membrane;

A second support frame supporting a lower surface of the vibrating membrane; And,

And a conductive coil surrounding outer surfaces of the first and second support frames.
The method of claim 9, wherein the first support frame,

A first through hole disposed along a peripheral area of the upper surface of the vibration membrane and exposing a central area of the upper surface of the vibration membrane;

The second support frame,

And a second through hole disposed along a peripheral area of the lower surface of the vibration membrane and exposing a central area of the lower surface of the vibration membrane.
The method of claim 9, wherein the inner surface of the first and second support frames,

And an incline with respect to the surface of the vibrating membrane.
The sound generating device according to claim 11, wherein an angle between the inner surfaces of the first and second support frames and the surface of the vibration membrane is an obtuse angle.
The method of claim 9, wherein the conductive coil,

And a number of turns of an outer side of the first support frame and a number of turns of an outer side of the second support frame are the same.
The method of claim 1, wherein the driving unit,

A first support frame supporting an upper surface of the vibrating membrane;

A second support frame supporting a lower surface of the vibrating membrane;

A first stator armature disposed over the first support frame;

A second stationary armature disposed over the second support frame;

A magnetic core structure connecting one side of the first fixed armature and the second fixed armature; And,

And a conductive coil surrounding an outer surface of the magnetic core structure.
The method of claim 14, wherein the first and second support frames,

An acoustic generator, characterized in that the insulator.
The method of claim 14, wherein the first fixed armature,

A peripheral region is in contact with the first support frame, a central region is disposed at a first interval away from an upper surface of the vibrating membrane,

The second fixed armature,

And a peripheral region is in contact with the second support frame, and a central region is disposed at a second interval from a lower surface of the vibrating membrane.
The sound generating device according to claim 16, wherein the first interval and the second interval are the same.
The sound generating apparatus of claim 16, wherein a plurality of holes are formed in a central region of the first fixed armature and a central region of the second fixed armature.
The method of claim 14, wherein the conductive coil,

The sound generating device, characterized in that spaced apart from the outer surface of the first, second support frame at a predetermined interval.
The vibration membrane of claim 1,

An internal magnetic field is generated by an external magnetic field generated from the driving unit,

The direction of the internal magnetic field of the vibrating membrane is

And a direction opposite to the direction of the external magnetic field generated from the driving unit.