TWI383691B - Flexible sounding device - Google Patents

Description

Flexible sounding device

The invention relates to a flexible sounding device, in particular to a flexible sounding device based on a carbon nanotube.

The sounding device generally consists of a signal input device and a sounding element. An electrical signal is input to the sounding element through the signal input device to emit a sound. The sounding element of the prior art is typically a speaker. The speaker is an electroacoustic device that converts an electrical signal into a sound signal. Specifically, the speaker can convert a range of audio electric power signals into an audible sound having a small distortion and a sufficient sound pressure level through an exchangeable manner.

There are many types of speakers in the past, and according to their working principle, they are divided into: electric speakers, electromagnetic speakers, electrostatic speakers and piezoelectric speakers. Although they work in different ways, they generally convert the "air-force-sound" by generating mechanical vibrations to push the surrounding air and causing the air medium to fluctuate. Among them, electric speakers are the most widely used.

Referring to FIG. 1, a prior electric speaker 100 is generally composed of three parts: a voice coil 102, a magnet 104, and a diaphragm 106. The voice coil 102 generally employs an energized conductor. When an audio current signal is input to the voice coil 102, the voice coil 102 corresponds to a current carrying conductor. Due to the magnetic field generated by the magnet 104, the current-carrying conductor is subjected to the Lorentz force in the magnetic field, so that the voice coil 102 is subjected to a magnitude proportional to the audio current and a direction that varies with the direction of the audio current. The power of change. Therefore, the voice coil 102 generates vibration under the action of the magnetic field generated by the magnet 104, and drives the diaphragm. The vibration of 106, the air before and after the diaphragm 106 also vibrates, and the electrical signal is converted into sound waves to radiate around. However, the structure of the speaker 100 is relatively complicated and it must operate under magnetic conditions. Moreover, due to the complicated structure of the speaker 100, it is difficult to design the speaker 100 into a flexible device whose shape can be arbitrarily changed, which limits the application of the speaker 100 to some extent.

Since the early 1990s, nanomaterials represented by carbon nanotubes (see Helical microtubules of graphitic carbon, Nature, Sumio Iijima, vol 354, p56 (1991)) have caused people with their unique structure and properties. Great attention. In recent years, with the deepening of research on carbon nanotubes and nanomaterials, its broad application prospects are constantly emerging. The carbon nanotubes have unique electromagnetic, optical, mechanical, and chemical properties, so there are more and more researches on carbon nanotubes.

Although the performance of the carbon nanotubes is excellent, it has a wide application prospect. However, since the carbon nanotubes are nanometer-scale, a large number of carbon nanotubes are easily agglomerated and are not easily dispersed to form a uniform macroscopic carbon nanotube structure, thereby limiting the The application of carbon nanotubes in macroscopic fields. Among the macroscopic carbon nanotube structures, a thin film-like carbon nanotube structure is widely used.

In order to form a film-like carbon nanotube structure, the previous methods mainly include: direct growth method, spray method or Langmuir. Langmuir Blodgett (LB) method. Among them, the direct growth method generally obtains a carbon nanotube film structure by chemical vapor deposition directly by controlling reaction conditions, such as using sulfur as an additive or providing a multilayer catalyst. The spraying method generally forms a carbon nanotube film structure by drying a carbon nanotube solution into an aqueous solution and coating it on a surface of a substrate. LB method is generally By mixing a carbon nanotube solution into another solution of different density (such as an organic solvent), the molecular carbon self-assembly motion is used, and the carbon nanotubes float out of the surface of the solution to form a carbon nanotube film structure.

However, in the above-described carbon nanotube film structure obtained by the direct growth method or the spray coating method, the carbon nanotubes tend to aggregate easily, resulting in uneven thickness of the film. The structure of the carbon nanotube film prepared by the LB method is generally a uniform network structure, and the carbon nanotubes are uniformly dispersed and do not agglomerate. However, the carbon nanotubes are still disorderly arranged in the film, which is disadvantageous for fully utilizing the nanometer. The performance of carbon tubes is still limited in their application.

The patent application No. TW091132618, filed on Sep. 24, 1997, to the Republic of China, discloses a carbon nanotube string comprising a bundle of carbon nanotube bundles connected end to end. Each of the carbon nanotube bundle segments includes a plurality of parallel carbon nanotubes. The carbon nanotubes in the carbon nanotube rope are connected end to end by Van der Waals force and are arranged substantially in the same direction. This nano carbon tube rope can conveniently use nano carbon tubes for macroscopic fields. The carbon nanotube rope can be used directly as a film-like carbon nanotube structure or a plurality of such carbon nanotube strings can be arranged side by side to obtain a film-like carbon nanotube structure.

A large number of applications on the application of carbon nanotubes in field emission electron sources, sensors, new optical materials, soft ferromagnetic materials, etc. have been reported. However, carbon nanotubes have not been found in the prior art for use in the field of acoustics.

In view of the above, it is necessary to provide a flexible sounding device that can operate under non-magnetic conditions and has a simple structure.

A flexible sounding device comprising: a sound emitting element; and a support body disposed on a surface of the support body; wherein the support body is a flexible support body, and the sound emitting element comprises a carbon nanotube structure.

A flexible sounding device comprising: a flexible support body and a carbon nanotube structure, the carbon nanotube structure being disposed on a surface of the flexible support.

Compared with the prior art, the flexible sounding device provided by the technical solution has the following differences: First, since the sounding element in the flexible sounding device includes only a carbon nanotube structure, and no other complicated structure such as a magnet is needed, The structure of the sounding device is relatively simple. Secondly, the flexible sounding device uses the input signal to cause the temperature of the sounding element to change, so that the surrounding gas medium rapidly expands and contracts, the density changes, and then the sound wave is emitted without a diaphragm, and the sounding device composed of the sounding element can be Work without magnetic conditions. Third, since the carbon nanotube structure has a small heat capacity and a large specific surface area, after the input signal, the sounding element composed of the carbon nanotube structure can be uniformly heated according to the change of the signal intensity (such as the current intensity). The surrounding gas medium, rapid temperature rise and fall, periodic temperature changes, and rapid heat exchange with the surrounding gas medium, so that the surrounding gas medium rapidly expands and contracts, emits a sound that can be perceived by the human ear, and the frequency of the sound emitted. The range is wider and the sounding effect is better. Fourth, since the carbon nanotubes have good mechanical strength and toughness, the carbon nanotube structure composed of carbon nanotubes has good mechanical strength and toughness, and has good durability, thereby facilitating the preparation of nanocarbon. Sounding devices of various shapes and sizes composed of tube structures are conveniently used in various fields. Fifth, since the sound emitting element is at least partially disposed in the flexibility The surface of the support body, the sound emitting element can withstand a high-intensity signal input, thereby enhancing the sounding effect of the sounding device. Sixth, since the flexible sounding device has a carbon nanotube structure as a sounding element, and the carbon nanotube structure is disposed on a flexible support body, the shape of the flexible sounding device can be arbitrarily changed without being damaged according to needs, and is convenient to use. A wide range of applications.

Hereinafter, the sound emitting device of the embodiment of the present technical solution will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2 , a first embodiment of the present invention provides a flexible sounding device 10 . The flexible sound emitting device 10 includes a sound emitting component 14 , a flexible support 16 , a first electrode 142 , and a second electrode 144 . The sound emitting element 14 is disposed on a surface of the flexible support body 16. The first electrode 142 and the second electrode 144 are spaced apart and electrically connected to the sound emitting element 14.

The flexible sounding device 10 further includes a signal input device 12, and the first electrode 142 and the second electrode 144 are electrically connected to both ends of the signal input device 12 through an external wire for inputting the signal input device 12 The alternating current signal is input to the sound emitting element 14.

The flexible sounding device 10 further includes a flexible protective layer 18 that covers the surface of the sound emitting element 14 away from the flexible support 16. That is, the sounding element 14 is disposed between the support body 16 and the flexible protective layer 18. The main function of the flexible protective layer 18 is to prevent the sounding element from coming into contact with the outside world, and to prevent external impurities from contaminating the sound emitting element. The flexible protective layer 18 can also make the appearance of the flexible sound emitting device more beautiful, such as designing various patterns on the surface of the flexible protective layer 18. . The shape of the flexible protective layer 18 is not limited and can cover the hair Sound components are all right. The material of the flexible protective layer 18 is not limited and is a flexible material, which may be a fabric, a plastic, a rubber, a resin or a paper.

The flexible support body 16 is mainly used for supporting, and its shape is not limited, and may be a planar structure or a three-dimensional structure. The material of the flexible support body 16 is not limited and is a flexible material, and the flexible material is a material with poor insulation or conductivity. A fabric, plastic, resin, rubber or paper formed from animal or plant fibers or rayon. Preferably, the material of the flexible support body 16 should have better thermal insulation properties, so that the heat generated by the sound emitting element 14 is prevented from being excessively absorbed by the flexible support body 16, and the purpose of heating the surrounding gaseous medium and sounding is not achieved. In addition, the flexible support body 16 should have a relatively rough surface, so that the sound emitting element 14 disposed on the surface of the flexible support body 16 can have a larger contact area with air or other external medium, thereby improving to some extent. The sounding effect of the flexible sounding device 10. The sound emitting element 14 can be directly disposed and attached to the surface of the flexible support body 16. Since the sound emitting element 14 is entirely supported by the flexible support body 16, the sound emitting element 14 can withstand a high-intensity signal input, thereby having a high sounding intensity. In the embodiment of the technical solution, the flexible support body 16 is a cotton cloth.

The sounding element 14 includes a carbon nanotube structure. The carbon nanotube structure is layered or otherwise shaped and has a large specific surface area. The carbon nanotube structure includes uniformly distributed carbon nanotubes, and the carbon nanotubes are tightly coupled by van der Waals force. The carbon nanotubes in the carbon nanotube structure are disordered or ordered. Specifically, when the carbon nanotube structure includes a disordered arrangement of carbon nanotubes, the carbon nanotubes are entangled or isotropically arranged; when the carbon nanotube structure includes an ordered arrangement of carbon nanotubes, Rice carbon The tubes are arranged in a preferred orientation in one direction or in a plurality of directions. The carbon nanotube structure comprises at least one layer of carbon nanotube film, at least one nano carbon line structure or a composite structure of a carbon nanotube film and a nano carbon line structure.

The carbon nanotube film may be a carbon nanotube film, a carbon nanotube film or a carbon nanotube film. Referring to FIG. 3, the carbon nanotube flocculation membrane is isotropic, and includes a plurality of randomly arranged and uniformly distributed carbon nanotubes. The carbon nanotubes are attracted and intertwined by Van der Waals forces. Therefore, the carbon nanotube flocculation membrane has good flexibility, can be bent and folded into any shape without cracking, and has good self-supporting property, and can be self-supported without substrate support. The carbon nanotube film has a thickness of from 1 micron to 1 mm.

The carbon nanotube rolled film is obtained by rolling an array of carbon nanotubes in a certain direction or in different directions, which comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are arranged in the same direction or in different directions. The carbon nanotubes in the carbon nanotube rolled film form an angle α with the surface of the carbon nanotube rolled film, wherein α is greater than or equal to zero degrees and less than or equal to 15 degrees (0 α 15°). Preferably, the carbon nanotubes in the carbon nanotube rolled film are parallel to the surface of the carbon nanotube film. The carbon nanotubes in the carbon nanotube rolled film have different arrangements depending on the manner of rolling. Specifically, the carbon nanotubes can be arranged isotropically; when rolled in different directions, the carbon nanotubes are arranged in different orientations, see FIG. 4 and FIG. 5, and the carbon nanotubes are milled in the carbon nanotubes. The lamination film may be arranged in a preferred orientation along a fixed direction or in a preferred orientation in different directions. The carbon nanotubes in the carbon nanotube rolled film partially overlap. The carbon nanotubes in the carbon nanotube film are attracted to each other by van der Waals force, and are tightly combined to make the nano carbon The tube laminated film has good flexibility and can be bent and folded into any shape without breaking. And because the carbon nanotubes in the carbon nanotube film are attracted to each other through the van der Waals force, the carbon nanotube film is a self-supporting structure, which can be self-supported without substrate support. presence. The rolled film has a thickness of from 1 μm to 1 mm.

The carbon nanotube film comprises a plurality of carbon nanotubes connected end to end and arranged in a preferred orientation in the same direction. The carbon nanotube film can be obtained by pulling directly from an array of carbon nanotubes. Referring to FIG. 6 and FIG. 7, preferably, the carbon nanotube film comprises a plurality of end-to-end and aligned carbon nanotube segments 143, each of the carbon nanotube segments 143 having substantially the same length, and The carbon nanotube segments 143 are connected to each other by Van der Waals force. The carbon nanotube section 143 includes a plurality of carbon nanotubes 145 of equal length and arranged in parallel with each other. The nano carbon tube drawn film obtained by directly pulling from a carbon nanotube array can be further treated by a volatile organic solvent, and the surface volume ratio of the treated carbon nanotube film is reduced, and the viscosity is reduced. And its mechanical strength and toughness are enhanced. The carbon nanotube film has a thickness of 0.5 nm to 100 μm. Further, when the carbon nanotube structure comprises at least two layers of carbon nanotube film which are arranged in an overlapping manner, the adjacent carbon nanotube film is tightly bonded by van der Waals force. The number of layers of the carbon nanotube film in the carbon nanotube structure is not limited, and the arrangement direction of the carbon nanotubes 145 in the adjacent two layers of carbon nanotube film has an intersection angle β, β It is greater than or equal to 0 degrees and less than or equal to 90 degrees, and can be prepared according to actual needs. When the carbon nanotube structure comprises a multi-layered carbon nanotube film, since the adjacent two layers of carbon nanotube film are tightly bonded by van der Waals force, the carbon nanotube structure itself is very good. Self-supporting can.

The nanocarbon pipeline-like structure includes at least one nanocarbon pipeline, and the nanocarbon pipeline structure is a stranded structure or a bundle structure. The nano-carbon pipeline structure of the bundle structure comprises a plurality of carbon nanotubes arranged side by side, and the nano carbon pipeline structure of the strand structure comprises a plurality of intertwined nano carbon pipelines. The nanocarbon pipeline includes a plurality of carbon nanotubes arranged end to end and arranged in a preferred orientation, and the nanocarbon pipeline is a bundle structure or a stranded structure. The carbon nanotubes in the bundle-structured nanocarbon pipeline are arranged along the axial direction of the nanocarbon pipeline, and the carbon nanotubes in the nanowire pipeline of the stranded structure are along the axis of the nanocarbon pipeline Arranged in a spiral. When the carbon nanotube structure comprises a nano carbon line structure, the nano carbon line structure can be directly used as a sounding element, and the nano carbon line structure can also be spirally arranged to form a planar structure for use as a sounding element. When the carbon nanotube structure includes a plurality of nanocarbon line-like structures, the plurality of nanocarbon line-like structures are arranged side by side or spaced apart from each other, or a plurality of nanocarbon line-like structures may be cross-shaped. The nano carbon line has a diameter of 1 micrometer to 100 micrometers and a length of 50 mm to 100 mm.

In an embodiment of the technical solution, the carbon nanotube structure comprises a layer of carbon nanotube film, and the arrangement direction of the carbon nanotubes extends from the first electrode to the second electrode. The carbon nanotube structure has a length and a width of 30 cm and a thickness of 50 nm, and the heat capacity per unit area is 1.7×10 ^-6 joules/cm 2 Kelvin.

The carbon nanotube structure has a thickness of 0.5 nm to 1 mm. If the thickness of the carbon nanotube structure is too large, the specific surface area is reduced and the heat capacity is increased; if the thickness of the carbon nanotube structure is too small, the mechanical strength is poor and the durability is not good enough. In the embodiment of the technical solution, the thickness of the carbon nanotube structure is 50 nm. When the thickness of the carbon nanotube structure is small, it can have good transparency. For example, when the thickness of the carbon nanotube film is 50 nm, the transmittance of the carbon nanotube film is 67% to 82. %. The carbon nanotubes in the carbon nanotube structure include one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. The single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm, the double-walled carbon nanotube has a diameter of 1.0 nm to 50 nm, and the multi-walled carbon nanotube has a diameter of 1.5. Nano ~ 50 nm.

It can be understood that the specific structure of the carbon nanotube structure is not limited. Preferably, the carbon nanotube structure satisfies the following three conditions, namely, a layer or other shape, and the thickness is 0.5 nm to 1 mm. And has a large specific surface area and a small heat capacity per unit area (less than 2 × 10 ^-4 Joules / cm 2 Kelvin); and includes a uniform distribution of carbon nanotubes.

Since the carbon nanotube has a large specific surface area, the carbon nanotube structure itself has good adhesion under the action of the van der Waals force, so when the carbon nanotube structure is used as the sounding element 14, the The sound emitting element 14 and the flexible support body 16 can be directly adhered and fixed. Further, a bonding layer (not shown) may be further included between the sound emitting element 14 and the flexible support body 16. The bonding layer may be disposed on a surface of the sound emitting element 14. The bonding layer can better secure the sounding element 14 to the surface of the flexible support 16. The material of the adhesive layer may be an insulating material or a material having a certain conductive property. Preferably, the bonding layer is a layer of silver glue. In this embodiment, the carbon nanotube structure is a carbon nanotube film, which adheres directly to the surface of the flexible support 16 by its own viscosity.

The first electrode 142 and the second electrode 144 are formed of a conductive material, which should Has a certain toughness or flexibility. Its specific shape structure is not limited. Specifically, the first electrode 142 and the second electrode 144 may be selected as a layer, a rod, a block or other shapes. The material of the first electrode 142 and the second electrode 144 may be selected from a metal, an alloy, a conductive paste, a metallic carbon nanotube, an indium tin oxide (ITO), or the like. The first electrode 142 and the second electrode 144 are used to implement an electrical connection between the signal input device 12 and the sound emitting element 14. The first electrode 142 and the second electrode 144 are electrically connected to the sound emitting element 14, respectively. Since the sound emitting element 14 is disposed on the surface of the flexible support body 16, the first electrode 142 and the second electrode 144 may also be fixedly disposed at both ends or surfaces of the sound emitting element 14. The arrangement of the first electrode 142 and the second electrode 144 is related to the arrangement direction of the carbon nanotubes in the sound emitting element 14, and preferably, the arrangement direction of the carbon nanotubes in the carbon nanotube structure is from the first The electrode 142 extends toward the second electrode 144. In the embodiment of the technical solution, the first electrode 142 and the second electrode 144 are rod-shaped platinum electrodes, and the first electrode 142 and the second electrode 144 are fixedly disposed at two ends of the sound emitting element 14 , and the The row direction of the carbon nanotubes in the sound emitting element 14 extends in the direction of the first electrode 142 to the second electrode 144. Since the first electrode 142 and the second electrode 144 are spaced apart, the sound emitting element 14 can be applied to the flexible sounding device 10 to access a certain resistance value to avoid short circuit phenomenon. Since the carbon nanotube has a large specific surface area, the carbon nanotube structure itself has good adhesion under the action of the van der Waals force, so when the carbon nanotube structure is used as the sounding element 14, the The first electrode 142 and the second electrode 144 are directly adhered to the sound emitting element 14 and form a good electrical contact.

In addition, the first electrode 142 and the second electrode 144 and the sound emitting element A conductive bonding layer (not shown) may be further included between the 14 layers. The conductive bonding layer may be disposed on a surface of the sound emitting element 14. The conductive bonding layer ensures that the first electrode 142 and the second electrode 144 are in electrical contact with the sound emitting element 14, and the first electrode 142 and the second electrode 144 are better fixed to the sounding element 14. In this embodiment, the conductive bonding layer is a layer of silver glue.

In addition, the first embodiment of the present technical solution may further provide that a plurality of electrodes are electrically connected to the sound emitting element 14 respectively, the number of which is not limited, and any two of the plurality of electrodes are respectively associated with the signal input device 12 The terminals are electrically connected to enable the signal input device to form an electrical signal between the two electrodes to operate the sounding element 14 electrically coupled between the two electrodes. Preferably, the two electrodes are positioned adjacent to each other. Specifically, any two adjacent electrodes of the plurality of electrodes are electrically connected to both ends of the signal input device 12 through external wires (not shown), and an external audio electrical signal is input to the sound emitting element 14 . .

It can be understood that since the sound emitting element 14 is disposed on the surface of the flexible support 16, the first electrode 142 and the second electrode 144 are optional structures. The signal input device 12 can be electrically connected to the sound emitting element 14 directly by wires or electrode leads or the like. It is only necessary to ensure that the signal input device 12 can input an electrical signal to the sounding element 14. Any manner in which the electrical connection between the signal input device 12 and the sound producing element 14 can be achieved is within the scope of the present technical solution.

The signal input by the signal input device 12 includes an alternating current signal, an audio electric signal, and the like. The signal input device 12 is electrically connected to the first electrode 142 and the second electrode 144 through a wire 149 and passes through the first electrode 142 and second electrode 144 input signals into the sound emitting element 14.

When the flexible sound generating device 10 is in use, since the carbon nanotube structure is layered, has a large specific surface area, and has a small thickness, the carbon nanotube structure has a small heat capacity per unit area and a large heat dissipating surface. . The carbon nanotube film can obtain a more uniform and smaller carbon nanotube structure, and the heat capacity can be as small as 1.7×10-6 joules/cm 2 Kelvin, which has better effect. After inputting the signal, according to the change of signal intensity (such as current intensity), the carbon nanotube structure can rapidly rise and fall, generate periodic temperature changes, and quickly exchange heat with the surrounding gas medium, so that the surrounding gas medium rapidly expands and Shrinkage, the density of the gas changes, and the sound that the human ear can perceive is emitted, and the frequency of the emitted sound has a wide frequency range, and the sounding effect is good. Therefore, in the embodiment of the technical solution, the sounding principle of the sounding element 14 is "electric-thermal-acoustic" conversion, and the sounding frequency ranges from 1 Hz to 100,000 Hz (ie, 1 Hz to 100 kHz), and has a wide range of applications. .

Fig. 8 is a graph showing the frequency response characteristic of the flexible sound generating device 10 when the carbon nanotube structure of this embodiment is employed. As can be seen from FIG. 9, the vocal intensity of the flexible sounding device 10 can reach a sound pressure level of 105 decibels, and the sounding frequency ranges from 1 Hz to 100,000 Hz. The flexible sounding device 10 has a good sounding effect. In addition, the carbon nanotube structure in the embodiment of the present technical solution has better toughness and mechanical strength, and is attached to the flexible support body 16 and can be repeatedly folded together with the flexible support body 16 without being broken. The carbon nanotube structure can be conveniently fabricated into flexible sounding devices 10 of various shapes and sizes, and the flexible sounding device 10 can be conveniently applied to various sound-emitting devices, such as when the flexible support 16 is made of fabric. Made into a vocal clothing, shoes and hats, etc.; when the flexible support 16 is made of paper, it can be made into a sound books. In addition, the flexible sounding device 10 can also be combined with flexible electronic components to make audible flexible electronic components, such as MP3, radio, etc., which can be folded freely.

Referring to FIG. 9 , a second embodiment of the present invention provides an audible flag using a flexible sounding device. The vocal flag includes a flag surface and a flag pole 42 , and the flag surface is connected to the flag pole 42 .

The flag surface is a flexible sounding device, and the flexible sounding device includes a sound emitting element 34, a flexible support body 36, a first electrode 342, and a second electrode 344. The sounding device in the second embodiment of the present technical solution is basically the same as the structure of the flexible sounding device 10 in the first embodiment. The flexible sounding device further includes a flexible protective layer 38 disposed on a surface of the sound emitting element 34 remote from the flexible support 36. In this embodiment, the flexible support body 36 and the flexible protective layer 38 are both a planar cloth, and the sound emitting element 34 is disposed between the flexible support body 36 and the flexible protective layer 38.

The sounding element 34 includes a carbon nanotube structure including a plurality of uniformly distributed carbon nanotubes, and the carbon nanotubes are arranged in an ordered or disordered arrangement. Preferably, the arrangement direction of the carbon nanotubes in the carbon nanotube structure extends from the first electrode 342 to the second electrode 344.

The sounding device further includes a signal input device 32, a first electrode lead 346 and a second electrode lead 348. One end of the first wire 346 is electrically connected to the first electrode 342, and the other end is electrically connected to the signal input device 32. One end of the second wire 348 is electrically connected to the second electrode 344, and the other end is electrically connected to the signal input device 32.

The specific shape of the flagpole 42 is not limited and may be long, cylindrical or empty. The heart rod shape, the material of the flagpole 42 is not limited, and may be plastic, wood, metal or rubber.

In this embodiment, the flagpole 42 is a plastic hollow rod. The first wire 346 and the second wire 348 in the flexible sounding device are electrically connected to both ends of the signal input device 32 through the hollow of the flagpole 42.

It can be understood that the pattern can be further designed on the surface of the flexible support 36 or the flexible protective layer 38, and the vocal flag can be raised and lowered by the flagpole 42 of the vocal banner to meet various needs.

The flexible sounding device provided by the embodiment of the present technical solution has the following advantages: First, since the sound emitting element in the flexible sounding device includes only a carbon nanotube structure, and no other complicated structure such as a magnet is needed, the structure of the flexible sounding device is relatively Simple, it is beneficial to reduce the cost of the flexible sounding device. Secondly, the flexible sound generating device uses the input signal to cause the temperature of the sounding element to change, thereby rapidly expanding and contracting the surrounding gas medium, thereby generating sound waves without a diaphragm, and the flexible sounding device composed of the sounding element can be non-magnetic. Work under conditions. Third, since the carbon nanotube structure has a small heat capacity and a large specific surface area, after the input signal, the sounding element composed of the carbon nanotube structure can be uniformly heated according to the change of the signal intensity (such as the current intensity). The surrounding gas medium, rapid temperature rise and fall, periodic temperature changes, and rapid heat exchange with the surrounding gas medium, so that the surrounding gas medium rapidly expands and contracts, emits a sound that can be perceived by the human ear, and the frequency of the sound emitted. The range is wide (1Hz~100kHz), and the sounding effect is better. Fourth, since the carbon nanotubes have good mechanical strength and toughness, the sounding element composed of the carbon nanotube structure has good mechanical strength and toughness, and has good durability, thereby being advantageous. In order to prepare a sounding device of various shapes and sizes composed of sounding elements, it is conveniently applied to various fields. Fifthly, when the flexible support body is a flat surface, the sound emitting element is directly disposed and attached to the surface of the flexible support body, so the sound emitting element can withstand high-intensity signal input, thereby having high sound generation. strength. Sixth, since the flexible sounding device is disposed on the flexible support body with the carbon nanotube structure as the sounding element, the shape of the flexible sounding device can be arbitrarily changed without being damaged according to needs, and the utility model has the advantages of convenient use and wide application range.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Speakers

102‧‧‧ voice coil

104‧‧‧ Magnet

106‧‧‧Densor

10‧‧‧Flexible sounding device

12,32‧‧‧Signal input device

142,342‧‧‧first electrode

144,344‧‧‧second electrode

143‧‧‧Nano carbon nanotube fragments

145‧‧・Nano carbon tube

14,34‧‧‧ Sounding components

346‧‧‧First wire

348‧‧‧second wire

16,36‧‧‧Flexible support

18,38‧‧‧Flexible protective layer

42‧‧‧ flagpole

1 is a schematic structural view of a speaker in the prior art.

2 is a schematic structural view of a flexible sounding device according to a first embodiment of the present technical solution.

Fig. 3 is a photograph of a carbon nanotube flocculation film of the first embodiment of the present technical solution.

4 is a scanning electron micrograph of a carbon nanotube rolled film including a plurality of carbon nanotubes arranged in a preferred orientation in the same direction in the first embodiment of the present technical solution.

FIG. 5 is a scanning electron micrograph of a carbon nanotube rolled film including a plurality of carbon nanotubes arranged in different orientations in a preferred orientation according to a first embodiment of the present technical solution.

Fig. 6 is a scanning electron micrograph of a carbon nanotube drawn film of the first embodiment of the present technical solution.

Fig. 7 is a schematic view showing a carbon nanotube film drawn by a first embodiment of the present technical solution.

FIG. 8 is a frequency response characteristic curve of the flexible sounding device of the first embodiment of the present technical solution.

FIG. 9 is a schematic structural view of a flexible sounding device according to a second embodiment of the present technical solution.

10‧‧‧ Sounding device

12‧‧‧Signal input device

14‧‧‧ Sounding components

142‧‧‧First electrode

144‧‧‧second electrode

16‧‧‧Support structure

Claims (20)

A flexible sounding device comprising: a sound emitting element; and a support body disposed on a surface of the support body; the improvement is that the support body is a flexible support body, and the sound emitting element comprises a nano carbon In the tube structure, the carbon nanotube structure converts an audio electrical signal into thermal energy, thereby changing the density of the medium surrounding the carbon nanotube structure to emit sound waves. The flexible sounding device of claim 1, wherein the carbon nanotube structure has a heat capacity per unit area of less than 2 x 10 ^-4 joules per square centimeter Kelvin. The flexible sounding device of claim 2, wherein the carbon nanotube structure has a heat capacity per unit area of 1.7 x 10 ^-6 joules per square centimeter Kelvin. The flexible sounding device of claim 1, wherein the sound emitting element is directly disposed and attached to a surface of the flexible support. The flexible sounding device of claim 1, wherein the flexible support is made of fabric, plastic, resin, rubber or paper. The flexible sounding device of claim 1, wherein the carbon nanotube structure is a layered structure having a thickness of 0.5 nm to 1 mm. The flexible sounding device of claim 1, wherein the carbon nanotube structure comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are disordered or ordered. The flexible sounding device of claim 7, wherein the carbon nanotubes in the carbon nanotube structure are connected end to end and are arranged in a preferred orientation in the same direction. The flexible sounding device of claim 1, wherein the sound emitting element has a sounding frequency of 1 Hz to 100 kHz. The flexible sounding device of claim 1, wherein the flexible sounding device further comprises a flexible protective layer disposed on a surface of the sound emitting element opposite to the flexible support and covering the sound emitting element. The sounding device of claim 1, wherein the sounding device further comprises a signal input device, and two ends of the signal input device are respectively electrically connected to the sound emitting element. The sounding device of claim 11, wherein the sounding device further comprises at least two electrodes, and both ends of the signal input device are electrically connected to the sound emitting element through the at least two electrodes. The sounding device of claim 12, wherein the carbon nanotubes in the carbon nanotube structure extend from one electrode to the other. The sounding device of claim 11, wherein the sounding device comprises a plurality of electrodes, the plurality of electrodes are spaced apart and electrically connected to the sound emitting element, and any two of the plurality of electrodes They are electrically connected to both ends of the signal input device, respectively. The sounding device of claim 14, wherein any two adjacent electrodes of the plurality of electrodes are electrically connected to both ends of the signal input device. The sounding device of claim 12, wherein the material of the electrode is metal, conductive paste, metallic carbon nanotube or indium tin oxide. A flexible sounding device comprising: a flexible support; A carbon nanotube structure, the carbon nanotube structure is disposed on a surface of the flexible support, and the carbon nanotube structure converts an audio electrical signal into heat energy, thereby changing a medium density around the carbon nanotube structure to emit sound waves. The sounding device of claim 17, wherein the sounding flag further comprises a first electrode and a second electrode electrically connected to the carbon nanotube structure, respectively. The sounding device of claim 18, wherein the carbon nanotube structure comprises a plurality of uniformly distributed carbon nanotubes, and the carbon nanotubes are arranged in an ordered or disordered arrangement. The sounding device of claim 19, wherein the carbon nanotube extends from the first electrode to the second electrode.