TWI455611B - Diaphragm, method for making the same and loudspeaker having the same - Google Patents

Description

Method for preparing diaphragm and diaphragm, and speaker having the same

The present invention relates to a vibrating membrane, a method of producing the vibrating membrane, and a speaker having the vibrating membrane.

The electric speaker moves the voice coil under the magnetic field to push the diaphragm to vibrate, and then the air around the diaphragm changes to generate an expansion wave and convert it into a sound wave that can be perceived by the human ear. It can be seen from the action of the vibrating membrane that the ideal vibrating membrane should not be easily deformed or even damaged when vibrating at a high frequency, and has a small inertia. That is, the diaphragm should have the characteristics of light weight and high specific strength to withstand high frequency and high power audio signals. However, conventional diaphragms are mostly made of polymer, paper or metal. Due to material limitations, the diaphragm cannot maintain or even increase the specific strength of the diaphragm while reducing the thickness and quality of the diaphragm. Therefore, the previous diaphragm has been unable to meet the development needs of the speaker.

In view of the above, it is necessary to provide a vibrating membrane having a further reduction in mass and an increase in specific strength, a method of producing the vibrating membrane, and a speaker having the vibrating membrane.

A vibrating membrane is a layered carbon nanotube composite structure. The layered carbon nanotube composite structure comprises a carbon nanotube film structure and an amorphous carbon structure. The carbon nanotube membrane structure comprises a plurality of carbon nanotube membrane structures having a plurality of micropores . The amorphous carbon structure includes a plurality of amorphous carbon particles filled in the pores of the carbon nanotube membrane structure. The plurality of amorphous carbon particles in the amorphous carbon structure are combined with a plurality of the carbon nanotubes by van der Waals and covalent bonds.

A vibrating membrane is a laminated carbon nanotube composite structure composed of a carbon nanotube membrane structure and a plurality of amorphous carbon particles, and the carbon nanotube membrane structure is formed by a plurality of carbon nanotubes.

A vibrating membrane is a layered carbon nanotube composite structure. The layered carbon nanotube composite structure comprises an amorphous carbon structure and a plurality of carbon nanotubes. The plurality of carbon nanotubes are disposed in the amorphous carbon structure in the form of a self-supporting carbon nanotube film structure. The amorphous carbon structure is combined with the plurality of carbon nanotubes by van der Waals and covalent bonds.

A method for preparing a vibrating membrane, comprising the steps of: providing a self-supporting carbon nanotube membrane structure and a polymer, the carbon nanotube membrane structure having a plurality of micropores; dissolving the polymer in a solvent, Forming a polymer solution; infiltrating the carbon nanotube film structure with the polymer solution; carbonizing the carbon nanotube film structure infiltrated with the polymer solution to carbonize the polymer into amorphous carbon.

A method for preparing a vibrating membrane, comprising the steps of: providing a self-supporting carbon nanotube membrane structure and a polymer monomer, the carbon nanotube membrane structure having a plurality of micropores; dissolving the polymer monomer in one In the solvent, a polymer monomer solution is formed; the polymer monomer solution is impregnated into the carbon nanotube film structure and the polymer monomer is polymerized, and the polymer monomer is polymerized to become a polymer; carbonization infiltration There is a polymeric carbon nanotube membrane structure to carbonize the polymer to amorphous carbon.

A speaker comprising a bracket, a magnetic field system, a voice coil, and a voice coil skeleton , a diaphragm and a certain heart piece. The magnetic field system, the voice coil, the voice coil bobbin, the diaphragm, and the centering piece are fixed by the bracket. The voice coil is received in the magnetic field system and disposed on an outer surface of the voice coil bobbin. One end of the diaphragm and the centering piece is fixed to the bracket, and the other end is fixed to the voice coil bobbin. The vibrating membrane is a layered carbon nanotube composite structure, and the lamellar carbon nanotube composite structure comprises a carbon nanotube membrane structure and an amorphous carbon structure. The carbon nanotube membrane structure has a plurality of micropores. The amorphous carbon structure includes a plurality of amorphous carbon particles filled in the pores of the carbon nanotube membrane structure.

Compared with the prior art, the carbon nanotube film structure and the amorphous carbon particles of the vibrating membrane are carbon materials, and the carbon material has a small density, so the carbon nanotube and the amorphous carbon particles are made. The diaphragm has good high temperature resistance and low quality. At the same time, since the carbon nanotube itself has excellent mechanical properties, the carbon nanotube film structure formed by the plurality of carbon nanotubes also has excellent mechanical properties; and the amorphous carbon particles are dispersed in the carbon nanotube film. In the structure, the compactness of the layered carbon nanotube composite structure and the bonding force between the carbon nanotubes can be increased, and the specific strength of the layered carbon nanotube composite structure is further increased. Therefore, when the vibrating membrane vibrates, the deformation, stress and tension formed by the vibration can be completely transmitted or shared to each of the carbon nanotubes and the amorphous carbon particles, so that the vibrating membrane has a good specific strength.

100, 200‧‧‧ speakers

110, 210‧‧‧ bracket

120, 220‧‧‧ magnetic field system

130, 230‧‧ ‧ voice coil

140, 240‧‧‧ voice coil skeleton

150, 250‧‧‧ vibrating membrane

160, 260‧‧‧ centering piece

111‧‧‧ Cavity

112‧‧‧ bottom

113‧‧‧ center hole

121‧‧‧Magnetic lower plate

122‧‧‧Magnetic upper plate

123‧‧‧ magnet

124‧‧‧magnetic core column

125‧‧‧ Magnetic field gap

151‧‧‧Nano Carbon Membrane Structure

152‧‧‧Amorphous carbon structure

1511‧‧‧Nano Carbon Tube

1512‧‧‧Micropores

1521‧‧‧Amorphous carbon particles

1 is a schematic structural view of a speaker according to an embodiment of the present invention.

2 is a cross-sectional structural view of the speaker of FIG. 1.

Figure 3 is a schematic view showing the structure of the diaphragm in the speaker of Figure 1.

Figure 4 is a cross-sectional view taken along line IV-IV of the diaphragm of Figure 3.

Figure 5 is a diagram showing the structure of the carbon nanotube film structure in Fig. 3 when the amorphous carbon particles are composited inside A schematic view of a partial enlarged structure.

Fig. 6 is a schematic view showing the structure of a speaker according to a second embodiment of the present invention.

Figure 7 is a schematic view showing the structure of the diaphragm in the speaker of Figure 6.

Fig. 8 is a flow chart showing a method of preparing a vibrating membrane according to a first embodiment of the present invention.

Fig. 9 is a flow chart showing another method of preparing a vibrating membrane according to a second embodiment of the present invention.

The invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2 , a first embodiment of the present invention provides a speaker 100 including a bracket 110 , a magnetic circuit system 120 , a voice coil 130 , a voice coil bobbin 140 , a diaphragm 150 , and a certain core branch . Slice 160. The magnetic field system 120, the voice coil 130, the voice coil bobbin 140, the vibrating membrane 150, and the centering support 160 are fixed by the bracket 110. The voice coil 130 is disposed on an outer surface of one end of the voice coil bobbin 140 and is housed in the magnetic circuit system 120 together with the voice coil bobbin 140. One end of the diaphragm 150 and the centering piece 160 is fixed to the bracket 110, and the other end is fixed to the voice coil bobbin 140.

The bracket 110 is a truncated cone structure with an open end and a cavity 111 and a bottom portion 112. The cavity 111 accommodates the diaphragm 150 and the centering piece 160. The bottom portion 112 also has a central aperture 113 for nesting the magnetic field system 120. The bracket 110 is relatively fixed to the magnetic field system 120 by the bottom portion 112.

The magnetic field system 120 includes a magnetically permeable lower plate 121, a magnetically permeable upper plate 122, a magnet 123, and a magnetic core post 124. The opposite ends of the magnet 123 are respectively concentrically disposed by the magnetically permeable lower plate 121 and magnetically permeable. The upper plate 122 is clamped. The magnetic conductive upper plate 122 and the magnet 123 are both annular structures, and the magnetic conductive upper plate 122 and the magnet 123 are surrounded by a cylindrical space in the magnetic field system. between. The magnetic core stud 124 is received in the cylindrical space and passes through the central hole 113. The magnetic core stud 124 extends from the magnetically permeable lower plate 121 to the magnetic conductive upper plate 122 and forms an annular magnetic field gap 125 with the magnet 123 for accommodating the voice coil 130. The magnetic field gap 125 has a constant magnetic field of a certain magnetic induction density. The magnetic field system 120 is fixed to the bottom portion 112 by the magnetic conductive upper plate 122, and the connection method thereof may be screwing, mating fixing, bonding, or the like. In this embodiment, the magnetic conductive upper plate 122 and the bottom portion 112 are fixed by screwing.

The voice coil 130 is received in the magnetic field gap 125, which is a driving unit of the speaker 100. The voice coil 130 is formed by winding a thin wire on the voice coil bobbin 140. Preferably, the wire is an enameled wire. When the voice coil 130 receives the audio signal, the voice coil 130 generates a magnetic field that varies with the audio current. The magnetic field of the change interacts with the constant magnetic field in the magnetic field gap 125, forcing the voice coil 130 to vibrate. .

The voice coil bobbin 140 is a hollow tubular structure disposed concentrically with the magnetic core stud 124 and spaced apart from the magnetic core stud 124 and partially received in the magnetic field gap 125 . The outer surface of the voice coil bobbin 140 is fixed to the voice coil 130, and is fixed to a center position of the vibrating membrane 150 away from one end of the magnetic field system 120. When the voice coil bobbin 140 vibrates with the voice coil 130, the vibrating membrane 150 is caused to vibrate, so that the air around the vibrating membrane 150 is expanded to generate sound waves.

The centering piece 160 is a undulating ring structure composed of a plurality of concentric rings. The inner edge of the centering piece 160 is sleeved on the voice coil bobbin 140 for supporting the voice coil bobbin 140. The outer edge of the centering piece 160 is fixed to one end of the bracket 110 near the center hole 113. The centering piece 160 has a large radial rigidity and a small axial rigidity, so that the voice coil 130 can freely move up and down in the magnetic field gap 125 without lateral movement, thereby avoiding the voice coil 130 and the magnetic circuit system. 120 touches.

Referring to FIG. 3, the diaphragm 150 is a sounding unit of the speaker 100. The diaphragm The shape and structure of the 150 is not limited, and is related to its specific application. For example, when the diaphragm 150 is applied to the large speaker 100, the diaphragm 150 may be a hollow and inverted cone structure; when the diaphragm 150 is applied to the micro vibration When the film 150 is used, the diaphragm 150 may be a circular or elliptical sheet structure. In addition, the surface of the vibrating membrane 150 may be further provided with a patterned structure or with a graphical design such as a strip shape, a fan shape, etc., which can be used to improve the sound quality according to the application requirements. In this embodiment, the vibrating membrane 150 is a hollow and inverted cone structure, and the top end or the center thereof is fixedly bonded to the voice coil bobbin 140, and the outer edge of the vibrating membrane 150 is movably connected to the bracket 110. .

Referring to FIG. 4 and FIG. 5, the layered carbon nanotube composite structure comprises a carbon nanotube film structure 151 and an amorphous carbon structure 152. The carbon nanotube film structure 151 includes a plurality of carbon nanotubes 1511. Further, the carbon nanotube film structure 151 includes a plurality of micropores 1512 formed by the plurality of carbon nanotubes 1511. Specifically, the adjacent carbon nanotubes 1511 are combined by van der Waals to form the self-supporting carbon nanotube film structure. The plurality of amorphous carbon particles 1521 (Amorphous carbon) are combined by a covalent bond to form an amorphous carbon structure 152.

The so-called "self-supporting structure" means that the carbon nanotube film structure 151 can maintain its own specific shape without being supported by a support. Since the large number of carbon nanotubes 1511 in the self-supporting carbon nanotube film structure 151 are attracted to each other by the van der Waals force, the carbon nanotube film structure 151 has a specific shape to form a self-supporting structure. The carbon nanotube film structure 151 may be a film-like structure formed of at least one carbon nanotube film. When the carbon nanotube film structure 151 includes a plurality of carbon nanotube films, the plurality of carbon nanotube films are laminated. Set up, adjacent carbon nanotube membranes are combined by van der Waals force. The carbon nanotube film can be a carbon nanotube film, a carbon nanotube film or a carbon nanotube film.

The carbon nanotube film structure 151 may include at least one carbon nanotube film, the carbon nanotube The drawn film is a self-supporting carbon nanotube film obtained by directly pulling from the carbon nanotube array. Each carbon nanotube film comprises a plurality of carbon nanotubes 1511 arranged substantially parallel and parallel to the surface of the carbon nanotube film. Specifically, the plurality of carbon nanotubes are connected end to end by van der Waals force and are arranged in a preferred orientation substantially in the same direction. The preferred orientation refers to the fact that most of the carbon nanotubes in the carbon nanotube film have a large orientation probability in a certain direction, and the preferred orientation can also be understood that the axial direction of the majority of the carbon nanotubes extends substantially in the same direction. It can be understood that since the large number of carbon nanotubes 1511 in the self-supporting carbon nanotube film are attracted to each other by van der Waals force and connected end to end by van der Waals force, the carbon nanotube film is made specific. Shape to form a self-supporting structure. The carbon nanotube segments have any width, thickness, uniformity, and shape. The thickness of the carbon nanotube film is 0.5 nm to 100 μm, and the width is related to the size of the carbon nanotube array for pulling the carbon nanotube film, and the length is not limited.

When the carbon nanotube film structure 151 comprises a laminated multilayer carbon nanotube film, a preferred angle between the adjacent two layers of carbon nanotube film forming a cross angle α is formed between the carbon nanotubes 1511. , α is greater than or equal to 0 degrees and less than or equal to 90 degrees. There is a gap between the adjacent carbon nanotube film or between adjacent carbon nanotubes 1511 in a carbon nanotube film, thereby forming a plurality of micropores 1512 in the carbon nanotube film structure 151. The pores 1512 have a pore size of less than about 10 microns.

The carbon nanotube membrane structure 151 can be a carbon nanotube flocculation membrane, and the carbon nanotube membrane is a self-supporting carbon nanotube membrane obtained by flocculation of a carbon nanotube raw material. The carbon nanotube flocculation membrane comprises carbon nanotubes which are intertwined and uniformly distributed. The length of the carbon nanotubes is greater than 10 microns, preferably between 200 and 900 microns, such that the carbon nanotubes are intertwined with each other. The carbon nanotubes are attracted and distributed by van der Waals forces to form a network structure. Due to the large amount of nano-particles in the self-supporting carbon nanotube flocculation membrane The carbon tubes 1511 are mutually attracted by the van der Waals force and intertwined with each other, so that the carbon nanotube film of the carbon nanotubes has a specific shape to form a self-supporting structure. The carbon nanotube film is isotropic. The carbon nanotubes in the carbon nanotube flocculation membrane are uniformly distributed and randomly arranged to form a large number of microporous 1512 structures, and the pores of the micropores 1512 are less than about 10 micrometers. The length and width of the carbon nanotube film are not limited. In the carbon nanotube flocculation film, the carbon nanotubes are intertwined with each other, so the carbon nanotube flocculation film has good flexibility and is a self-supporting structure, which can be bent and folded into any shape without breaking. . The area and thickness of the carbon nanotube flocculation membrane are not limited, and the thickness is from 1 micrometer to 1 millimeter, preferably 100 micrometers. The specific structure of the carbon nanotube flocculation membrane and the preparation method thereof are described in Taiwan Patent Application No. 200844041, published on Nov. 6, 2008. To save space, reference is made only to this, and all technical disclosures of the application should be considered as part of the technical disclosure of the present application.

The carbon nanotube membrane structure 151 can be a carbon nanotube rolled membrane, which is a self-supporting carbon nanotube membrane obtained by rolling a carbon nanotube array. . The carbon nanotube rolled film comprises a uniformly distributed carbon nanotube 1511, and the carbon nanotubes 1511 are arranged in a preferred orientation in the same direction or in different directions. The carbon nanotubes in the carbon nanotube rolled film partially overlap each other and are attracted to each other by the van der Waals force, so that the carbon nanotube film structure 151 has good flexibility and can be bent and folded. In any shape without breaking. Moreover, since the carbon nanotubes 1511 in the carbon nanotube rolled film are mutually attracted by the van der Waals force and tightly combined, the carbon nanotube rolled film is a self-supporting structure. The carbon nanotubes in the carbon nanotube rolled film form an angle β with the surface of the growth substrate forming the carbon nanotube array, wherein β is greater than or equal to 0 degrees and less than or equal to 15 degrees, and the angle β is applied to The pressure on the carbon nanotube array is related. The larger the pressure, the smaller the angle. Preferably, the carbon nanotubes 1511 in the carbon nanotube rolled film are arranged parallel to the growth substrate. The carbon nanotube rolled film is passed through a crushing one The carbon nanotube array is obtained, and the carbon nanotubes in the carbon nanotube rolled film have different arrangement forms depending on the manner of rolling. Specifically, the carbon nanotubes 1511 may be disorderly arranged; when rolled in different directions, the carbon nanotubes 1511 are preferentially oriented in different directions; when rolled in the same direction, the carbon nanotubes 1511 are in a fixed direction. Preferred orientation. The length of the carbon nanotube 1511 in the carbon nanotube rolled film is greater than 50 microns.

The area and thickness of the carbon nanotube rolled film are not limited, and can be selected according to actual needs. The area of the carbon nanotube rolled film is substantially the same as the size of the carbon nanotube array. The thickness of the carbon nanotube film is related to the height of the carbon nanotube array and the pressure of the rolling, and may be 1 micrometer to 1 millimeter. It can be understood that the larger the height of the carbon nanotube array and the lower the pressure applied, the greater the thickness of the prepared carbon nanotube rolled film; on the contrary, the smaller the height of the carbon nanotube array, the more the applied pressure Large, the smaller the thickness of the prepared carbon nanotube rolled film. A gap is formed between the adjacent carbon nanotubes 1511 in the carbon nanotube rolled film, thereby forming a plurality of micropores 1512 in the carbon nanotube rolled film, and the pore diameter of the micropores 1512 is less than 10 micrometers. .

When the carbon nanotubes 1511 are arranged in a regular order, in the direction in which the carbon nanotubes are arranged, the carbon nanotube film can fully utilize the large strength and Young's modulus of the carbon nanotubes in the axial direction, thereby The carbon nanotube film has a large strength and a Young's modulus along the axial direction of the carbon nanotube 1511 therein. Therefore, the intensity and Young's modulus of the vibrating membrane 150 in different directions can be changed according to the position and direction of the vibrating membrane 150 to increase the strength and the Young's modulus, thereby adapting to different directions. The application of the speaker is required.

The amorphous carbon structure 152 includes a plurality of amorphous carbon particles 1521 filled in the micropores of the carbon nanotube film structure 151 and uniformly distributed in the micropores, and the amorphous carbon particles 1521 are distributed in the plurality of nano carbons. In the gap between the tubes 1511. Further, the The plurality of amorphous carbon particles 1521 are attached to the wall of the carbon nanotube 1511 or coated on a part of the surface of the carbon nanotube. In the present embodiment, the amorphous carbon structure 152 further includes a plurality of amorphous carbon particles 1521 disposed on both sides of the carbon nanotube film structure 151 to form two amorphous carbon layers. That is, the carbon nanotube film structure 151 is completely coated by the amorphous carbon structure 152 and is composited inside the amorphous carbon structure 152.

The amorphous carbon particles 1521 and the carbon nanotubes 1511 are bonded to each other by van der Waals and covalent bonds. Specifically, the covalent bond includes an sp ² or sp ³ bond formed between carbon-carbon atoms. The plurality of amorphous carbon particles 1521 in the amorphous carbon structure 152 are bonded to each other by a covalent bond and form a unitary structure. Specifically, the covalent bond includes an sp ² or sp ³ bond formed between carbon-carbon atoms. Therefore, from a macroscopic point, the amorphous carbon structure 152 has a sponge-like structure, and the carbon nanotube film structure 151 is buried therein. In other words, the plurality of carbon nanotubes 1511 are disposed in the amorphous carbon structure 152 in the form of a self-supporting carbon nanotube film structure 151, and the amorphous carbon structure 152 and the plurality of carbon nanotubes pass through The combination of tile and covalent bonds.

The amorphous carbon particle 1521 is one of carbon materials, and its external structure is not limited, but its internal structure has the same crystal structure as graphite, and the layered structure formed only by the hexagonal annular plane of carbon atoms is disorderly and irregular. . The amorphous carbon particles 1521 include bone charcoal, carbon black, and the like. The amorphous carbon particles 1521 can be obtained by low-temperature carbonization of a polymer material such as polyacrylonitrile fiber, pitch fiber, viscose or phenolic fiber. In the present embodiment, the amorphous carbon particles 1521 are produced by carbonizing the polyacrylonitrile fibers at about 1000. Further, the method for preparing the layered carbon nanotube composite structure comprises the following steps: First, a polymer material is formulated into a solution and infiltrated into the carbon nanotube film structure 151, the polymer material and the nanometer The carbon nanotube 1511 in the carbon film structure 151 can be bonded by a covalent bond and a van der Waals force. Second, carbonation dip The carbon nanotube film structure 151 moistened with the polymer material solution causes the polymer material to lose part of nitrogen, hydrogen and oxygen to form an amorphous carbon structure 152, and the carbon nanotube film structure 151 is embedded therein. The amorphous carbon structure 152 is a unitary structure, and a part of the amorphous carbon particles 1521 in the amorphous carbon structure 152 is filled in the carbon nanotube film structure 151; a part of the amorphous carbon particles 1521 is disposed on the carbon nanotube film structure. 151 sides.

The vibrating membrane comprises a carbon nanotube membrane structure formed of a plurality of carbon nanotubes and a plurality of amorphous carbon particles dispersed in the carbon nanotube membrane structure. The carbon nanotubes and the amorphous carbon particles have a small density, so that the diaphragm made of the carbon nanotubes and the amorphous carbon particles has a smaller mass. At the same time, since the carbon nanotube itself has excellent mechanical properties, the carbon nanotube film structure formed by the plurality of carbon nanotubes also has excellent mechanical properties; and the amorphous carbon particles are dispersed in the carbon nanotube film. In the structure, the compactness of the layered carbon nanotube composite structure and the bonding force between the carbon nanotubes can be increased, and the specific strength of the layered carbon nanotube composite structure is further increased. Therefore, when the vibrating membrane vibrates, the deformation, stress and tension formed by the vibration can be completely transmitted or shared to each of the carbon nanotubes and the amorphous carbon particles, so that the vibrating membrane has a good specific strength. Further, the carbon nanotubes and the amorphous carbon particles are all carbon materials, so the diaphragm has the advantages of corrosion resistance, moisture resistance and the like.

Referring to FIG. 6 , a second embodiment of the present invention provides a speaker 200 including a bracket 210 , a magnetic field system 220 , a voice coil 230 , a voice coil bobbin 240 , a diaphragm 250 , and a centering piece 260 . The magnetic field system 220, the voice coil 230, the voice coil bobbin 240, the diaphragm 250, and the centering piece 260 are fixed by the bracket 210. The voice coil 230 is disposed on an outer surface of one end of the voice coil bobbin 240 and is housed in the magnetic field system 220 together with the voice coil bobbin 240. One end of the diaphragm 250 and the centering piece 260 is fixed to the bracket 210, the other end is fixed on the voice coil bobbin 240.

The diaphragm 250 is made of a carbon material including a plurality of carbon nanotubes and a plurality of amorphous carbon particles. The plurality of carbon nanotubes form a carbon nanotube film structure, and the plurality of amorphous carbon particles form an amorphous carbon structure. The carbon nanotube film structure comprises a plurality of nano carbon line-like structures, and the plurality of carbon-carbon line structures form a one-sided carbon nanotube film structure by weaving or the like. A portion of the amorphous carbon particles in the amorphous carbon structure are dispersed in the carbon nanotube film structure.

The structure and working principle of the speaker 200 provided by the embodiment of the present invention are substantially the same as those of the speaker 100 provided by the first embodiment, except that the carbon nanotube film structure in the diaphragm 250 is composed of at least one carbon nanowire structure. Composition, each carbon nanowire structure comprises a plurality of carbon nanotubes connected end to end by van der Waals force and arranged axially along the nanocarbon line structure. The carbon nanotube membrane structure may be formed by bending, winding, and weaving a nano carbon line-like structure, or may be arranged in parallel, cross-arranged or woven into a network structure by a plurality of nano carbon line-like structures. The plurality of nano carbon pipelines may be arranged in parallel to each other to form a bundle structure, or twisted to each other to form a stranded structure. The method of weaving is not limited, for example, by dividing the plurality of nanocarbon line-like structures into mutually perpendicular rows of nanocarbon line-like structures and columnar carbon line-like structures, and then performing the nanocarbon line structure and The columnar carbon-like structure is woven with each other; referring to FIG. 7, the plurality of carbon-carbon line-like structures may be further divided into a ring-shaped nanocarbon line-like structure corresponding to an arc of the annular structure of the centering piece and the The circular arc directly corresponds to the radial nanocarbon pipeline-like structure, and the annular nanocarbon pipeline-like structure is woven with the radial nanocarbon pipeline-like structure. The nanocarbon pipeline structure may be a single carbon carbon pipeline or a strand formed by a plurality of nanocarbon pipelines. The plurality of nano carbon pipelines may be arranged in parallel to each other to form a bundle structure, or twisted to each other to form a stranded structure. The nanocarbon line can be a non-twisted nano carbon line or a twisted nano carbon line.

The non-twisted nano carbon pipeline is obtained by treating a carbon nanotube film by an organic solvent. The non-twisted nanocarbon pipeline includes a plurality of carbon nanotubes arranged along the length of the nanocarbon pipeline. Specifically, the non-twisted nanocarbon pipeline includes a plurality of carbon nanotubes connected end to end by van der Waals force and arranged in an axially preferred orientation along the nanocarbon pipeline. The carbon nanotube segments have any length, thickness, uniformity, and shape. The non-twisted nano carbon line is not limited in length and has a diameter of 0.5 nm to 100 μm.

The twisted nanocarbon pipeline is obtained by twisting both ends of the carbon nanotube film in the opposite direction by a mechanical force. The twisted nanocarbon pipeline includes a plurality of carbon nanotubes arranged in an axial spiral arrangement around the carbon nanotubes. Specifically, the twisted nanocarbon pipeline includes a plurality of carbon nanotubes connected end to end by van der Waals force and extending helically along the axial direction of the carbon nanotubes. The carbon nanotube segments have any length, thickness, uniformity, and shape. The twisted nanocarbon line is not limited in length and has a diameter of 0.5 nm to 100 μm. Since the nano carbon pipeline is obtained by treating the above carbon nanotube film with an organic solvent or mechanical force, the carbon nanotube film is a self-supporting structure, so the nano carbon pipeline is a self-supporting structure. In addition, there is a gap between adjacent carbon nanotubes in the nanocarbon pipeline, so the nanocarbon pipeline has a large number of micropores, and the pore diameter of the micropores is less than about 10 micrometers.

With respect to the speaker 100 in the first embodiment, in the speaker 200 of the present embodiment, the carbon nanotube film structure in the diaphragm 250 is formed of a plurality of carbon nanowire structures. Since the carbon nanotubes in the carbon nanowire structure are arranged substantially parallel or spirally along the length direction of the nanocarbon line, the carbon nanowire structure has a large strength and a Young's modulus in the longitudinal direction. The strength and Young's modulus of the direction can be increased by designing the orientation of the nanocarbon line-like structure.

Referring to FIG. 8, a method for preparing a vibrating membrane according to a first embodiment of the present invention is provided. It includes the following steps.

Step S101: providing a self-supporting carbon nanotube film structure and a polymer, the carbon nanotube film structure having a plurality of micropores. The carbon nanotube membrane structure comprises a plurality of carbon nanotubes, and the adjacent carbon nanotubes are combined by van der Waals and form a plurality of micropores. The polymer includes one or a combination of polyacrylonitrile, asphalt, viscose and phenolic fibers. In this embodiment, the polymer is polyacrylonitrile.

Step S102: dissolving the polymer in a solvent to form a polymer solution. The solvent is a solvent which is volatile and has a strong dissolving power for the polymer, such as tetrahydrofuran or carbon tetrachloride.

Step S103: The polymer solution is allowed to infiltrate the carbon nanotube film structure. Since the carbon nanotube membrane structure is a self-supporting structure, the carbon nanotube membrane structure can be immersed in the polymer solution to infiltrate the carbon nanotube membrane structure. After the polymer solution infiltrates the carbon nanotube membrane structure, a portion of the polymer solution will penetrate into the micropores of the carbon nanotube membrane structure and be in intimate contact with the carbon nanotubes in the carbon nanotube membrane structure.

Step S104: carbonizing the carbon nanotube film structure infiltrated with the polymer solution to carbonize the polymer into amorphous carbon. The carbonization temperature is 500 degrees or less at normal temperature and 1000 degrees or less under high vacuum. Due to the good heat resistance of the carbon nanotubes, the structure and properties of the carbon nanotube membrane structure do not change under the carbonization environment. The polymer, by carbonization, removes most of the nitrogen, hydrogen and oxygen to form amorphous carbon. Wherein a part of the polymer solution penetrating into the micropores of the carbon nanotube membrane structure forms part of amorphous carbon filled in the micropores, and a part of the polymer solution immersed in the entire carbon nanotube membrane structure forms part of the amorphous carbon Distributed on the opposite surface of the carbon nanotube membrane structure. The amorphous carbon and the carbon nanotube are bonded by van der Waals and covalent bonds, and the covalent bond includes sp ² or sp ³ bonds formed between carbon-carbon atoms. And the plurality of amorphous carbons form a monolithic amorphous carbon structure by covalent bonding. Thereby forming a layered carbon nanotube composite structure.

The preparation process of the vibrating membrane does not need to involve a complicated chemical reaction process, and the reaction conditions are relatively mild. Therefore, the preparation method of the vibrating membrane is simple and the cost is low.

Referring to FIG. 9, a method for preparing a vibrating membrane according to a second embodiment of the present invention includes the following steps.

Step S201: providing a self-supporting carbon nanotube film structure and a polymer monomer having a plurality of micropores. The polymer monomer is a compound capable of undergoing polymerization such as a double bond, a hydroxyl group, a carboxyl group or an epoxy group. In this embodiment, the polymer monomer is polypropylene having a double bond.

Step S202: dissolving the polymer monomer in a solvent to form a polymer monomer solution. The solvent employs a solvent which is volatile and has a strong dissolving power for the polymer monomer, such as tetrahydrofuran or carbon tetrachloride.

Step S203: infiltrating the carbon nanotube film structure by the polymer monomer solution and polymerizing the polymer monomer, and the polymer monomer is polymerized after polymerization. The polymer monomer solution penetrates into the interior of the carbon nanotube membrane structure, and after polymerization, the polymer monomer is polymerized in situ in the solution to form a polymer, wherein the polymer penetrates into the inner structure of the carbon nanotube membrane structure. The polymer formed by in-situ polymerization of the monomer solution is also combined with the carbon nanotube film structure to form a composite structure. In this embodiment, the polymer monomer is polypropylene, which is polymerized in situ to form polyacrylonitrile.

Step S204: carbonizing the composite structure of the carbon nanotube film structure and the polymer to make the The polymer is carbonized to amorphous carbon.

Compared with the method for preparing the vibrating membrane provided in the first embodiment, the present embodiment is made by infiltrating the polymer monomer into the carbon nanotube membrane structure and in-situ polymerization of the carbon nanotube membrane structure. The material can be complexed in the structure of the carbon nanotube membrane. The polymer can be selected to a wider range even if the carbon nanotube film structure is capable of infiltrating a polymer which is poorly soluble in a solvent.

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.

1511‧‧‧Nano Carbon Tube

1512‧‧‧Micropores

1521‧‧‧Amorphous carbon particles

Claims (22)

A vibrating membrane is improved in that the vibrating membrane is a layered carbon nanotube composite structure, and the layered carbon nanotube composite structure comprises: a carbon nanotube membrane structure, and the carbon nanotube membrane structure comprises plural a carbon nanotube membrane having a plurality of micropores; and an amorphous carbon structure comprising a plurality of amorphous carbon particles filled in the pores of the carbon nanotube membrane structure, The plurality of amorphous carbon particles in the amorphous carbon structure are combined with the plurality of carbon nanotubes by van der Waals and covalent bonds. The vibrating membrane of claim 1, wherein the amorphous carbon particles are uniformly distributed in the micropores of the carbon nanotube membrane structure. The vibrating membrane according to claim 1, wherein the plurality of amorphous carbon particles are distributed on the wall of the carbon nanotube or coated on a part of the surface of the carbon nanotube. The vibrating membrane of claim 1, wherein the amorphous carbon structure further comprises a plurality of amorphous carbon particles attached to surfaces on both sides of the carbon nanotube membrane structure to form two amorphous carbon layers. The vibrating membrane according to claim 1, wherein the plurality of amorphous carbon particles in the amorphous carbon structure are bonded to each other by a covalent bond. The vibrating membrane of claim 1, wherein the amorphous carbon structure is a sponge-like structure, and the carbon nanotube membrane structure is embedded in the amorphous carbon structure. The vibrating membrane of claim 4 or 5, wherein the covalent bond comprises a sp ² or sp ³ bond between carbon-carbon atoms. The vibrating membrane of claim 1, wherein the carbon nanotube membrane structure is a self-supporting structure. The vibrating membrane of claim 8, wherein the carbon nanotube membrane structure comprises a plurality of carbon nanotubes bonded to each other by van der Waals force. The vibrating membrane of claim 8, wherein the carbon nanotube membrane structure is composed of at least one nanocarbon line-like structure including a plurality of carbon nanotubes connected end to end by van der Waals force And arranged along the axial direction of the nanocarbon pipeline structure. The vibrating membrane of claim 1, wherein the carbon nanotube membrane structure comprises a plurality of nanocarbon line-like structures. The vibrating membrane of claim 11, wherein the carbon nanotube membrane structure comprises a plurality of nanocarbon line-like structures disposed in parallel with each other, cross-arranged or woven into a network structure. The vibrating membrane of claim 1, wherein the carbon nanotube membrane structure comprises at least one carbon nanotube membrane comprising a plurality of carbon nanotube membranes. The vibrating membrane of claim 13, wherein the carbon nanotube membrane structure comprises a plurality of carbon nanotube membrane laminates disposed adjacent to each other by a vanguard force. The vibrating membrane according to claim 13, wherein the carbon nanotube membrane is isotropic, and the plurality of carbon nanotubes in the carbon nanotube membrane are uniformly distributed. The vibrating membrane of claim 13, wherein the plurality of carbon nanotubes in the carbon nanotube membrane are substantially parallel to each other and substantially parallel to the surface of the carbon nanotube membrane. The vibrating membrane of claim 16, wherein the plurality of carbon nanotubes are connected end to end by van der Waals force and are arranged in a preferred orientation substantially in the same direction. A vibrating membrane is improved in that the vibrating membrane is a laminated carbon nanotube composite structure composed of a carbon nanotube membrane structure and a plurality of amorphous carbon particles, and the carbon nanotube membrane structure is composed of a plurality of nanocarbons Tube formation. A vibrating membrane is improved in that the vibrating membrane is a layered carbon nanotube composite structure, and the lamellar carbon nanotube composite structure comprises an amorphous carbon structure and a plurality of carbon nanotubes, and the plurality of carbon nanotubes The amorphous carbon structure is disposed in the form of a self-supporting carbon nanotube film structure, and the amorphous carbon structure is combined with the complex carbon nanotubes by van der Waals and covalent bonds. A method for preparing a vibrating membrane, comprising the steps of: providing a self-supporting carbon nanotube membrane structure and a polymer, the carbon nanotube membrane structure having a plurality of micropores; dissolving the polymer in a solvent, Forming a polymer solution; infiltrating the carbon nanotube film structure with the polymer solution; and carbonizing the carbon nanotube film structure infiltrated with the polymer solution to carbonize the polymer into amorphous carbon. A method for preparing a vibrating membrane, comprising the steps of: providing a self-supporting carbon nanotube membrane structure and a polymer monomer, the carbon nanotube membrane structure having a plurality of micropores; dissolving the polymer monomer in one Forming a polymer monomer solution in the solvent; infiltrating the carbon nanotube film structure by the polymer monomer solution and causing polymerization of the polymer monomer, the polymer monomer is polymerized to become a polymer; The composite structure of the carbon nanotube film structure and the polymer is carbonized to carbonize the polymer into amorphous carbon. A speaker includes a bracket, a magnetic field system, a voice coil, a voice coil bobbin, a vibrating membrane and a centring support, and the magnetic field system, the voice coil, the voice coil bobbin, the vibrating membrane and the centering fin pass through the The voice coil is fixed in the magnetic field system and disposed on the outer surface of the voice coil bobbin, one end of the vibrating membrane and the centering piece is fixed to the bracket, and the other end is fixed to the voice coil bobbin, and the improvement is that The vibrating membrane is a layered carbon nanotube composite structure, and the lamellar carbon nanotube composite structure comprises a carbon nanotube membrane structure and an amorphous carbon structure, and the carbon nanotube membrane structure has a plurality of micropores, The amorphous carbon structure includes a plurality of amorphous carbons filled in the pores of the carbon nanotube membrane structure.