TWI455610B - Damper and speaker using the same - Google Patents

Description

Centering piece and speaker using the centering piece

The present invention relates to a centering support and a speaker using the same.

Speakers are electronic components that convert electrical energy into mechanical energy, such as telephones, mobile communication terminals, computers, televisions, cassette tapes, sound equipment, and automobiles.

Most of the speakers in the prior art use electric speakers, which generally include a diaphragm, a voice coil, a voice coil bobbin, a centering piece, and a magnetic circuit system. The speaker pushes the diaphragm to vibrate and emit sound waves through the movement of the voice coil under the magnetic field. The centering piece in the speaker cushions the diaphragm. The centering piece is used to support the joint of the voice coil and the diaphragm to ensure that it is vertical without skew. The centering piece allows the voice coil to freely move up and down in the magnetic gap in the magnetic circuit system without lateral movement, ensuring that the voice coil does not collide with the magnetically permeable plate in the magnetic circuit system. In addition, the centering piece can prevent external dust and the like from falling into the magnetic gap, avoiding the friction between the dust and the voice coil, and causing the speaker to produce an abnormal sound.

Centering struts usually require good axial elasticity and high radial strength. In addition, the centering piece will do a lot of movement during the sounding of the speaker. Therefore, the centering piece should also have good fatigue resistance to ensure its long service life. Therefore, the material used to prepare the centering piece should have good elasticity, strength and fatigue resistance. However, the previous centering piece is usually composed of a material such as polymer, metal or paper, and its axial elasticity and radial strength are insufficient, so that the centering piece cannot adapt to the vibration of the voice coil, thereby affecting the sounding effect of the speaker. In addition, the previous centering piece is easily fatigue-deformed in repeated vibrations, resulting in collapse along the axial direction of the speaker, resulting in shortened life of the speaker and poor sound quality. Therefore, it is necessary to develop a centering piece with good axial elasticity, high radial strength and fatigue resistance.

In view of this, it is indeed necessary to provide a centering piece having good elasticity, strength, and fatigue resistance and a speaker using the same.

A centering support sheet, wherein the centering support piece comprises a paper base and a plurality of carbon nanotubes dispersed in the paper base.

A centering support sheet, wherein the centering support piece comprises a sheet-like structure composed of a carbon nanotube paper, and the sheet-like structure has a through hole at the center thereof.

A speaker comprising: a voice coil; a voice coil bobbin, the voice coil is disposed on the voice coil bobbin; a vibrating membrane, the vibrating membrane is connected to one end of the voice coil bobbin; a centering piece is sleeved on the voice coil bobbin; and a magnetic field system, the magnetic field system has a magnetic field gap, the voice coil is disposed in the magnetic field gap; wherein the centering piece includes a paper a matrix and a plurality of carbon nanotubes dispersed in the paper matrix.

A speaker comprising: a voice coil; a voice coil bobbin, the voice coil is disposed on the voice coil bobbin; a vibrating membrane, the vibrating membrane is connected to one end of the voice coil bobbin; a centering piece is sleeved on the voice coil bobbin; and a magnetic field system, the magnetic field system has a magnetic field gap, and the voice coil is disposed in the magnetic field gap; wherein the centering piece includes a The carbon nanotube paper has a sheet-like structure, and the sheet-like structure has a through hole at the center.

Compared with the prior art, the centering support piece provided by the present invention and the speaker using the same have the following advantages: First, since the carbon nanotube has excellent strength, the carbon nanotube is dispersed on the paper. In the matrix, the strength of the paper substrate can be increased, so that the centering piece composed of the paper substrate can better function as a buffer and a positioning. Secondly, because the carbon nanotubes have good flexibility, the carbon nanotubes are dispersed in the matrix of the centering piece, which can improve the fatigue resistance of the matrix, so that the centering piece is not easy to fatigue in repeated vibrations. The deformation, and thus the collapse of the axial direction of the speaker, is not easy to occur, thereby contributing to the improvement of the service life of the speaker using the centering piece. Third, since the carbon nanotubes have a small density, the carbon nanotubes are dispersed in the matrix of the centering piece, and the weight of the centering piece can be reduced while maintaining or even increasing the strength of the centering piece. To reduce the weight of the speaker. This effect is more pronounced especially in microspeakers.

The centering piece provided by the embodiment of the present invention and the speaker using the centering piece 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 centering support piece 100. The centering support 100 includes a paper substrate 106 and a plurality of carbon nanotubes 108 dispersed in the paper substrate 106. The paper substrate 106 and a plurality of carbon nanotubes 108 dispersed in the paper substrate 106 form a carbon nanotube paper. The centering piece 100 may be a sheet-like structure composed of the carbon nanotube paper.

The paper substrate 106 includes various fibrous materials as well as additive materials. The fibrous material may include one or more of wood fiber, carbon fiber, glass fiber, nylon fiber, polypropylene fiber, cotton fiber, and bamboo fiber. The additive material may include one or more of hemicellulose, lignin, resin, pigment, pectin, and ash. It should be noted that any other fibrous material for papermaking, which is not described in the present application, and the additive material, which are intended to be used for the centering support 100, are all within the scope of the present invention.

The carbon nanotubes 108 are uniformly dispersed in the paper substrate 106. Further, the surface of the carbon nanotube 108 may have a functional group. The functional group includes one or more of a carboxyl group (-COOH), a hydroxyl group (-OH), an aldehyde group (-CHO), and an amino group (-NH ₂ ). This functional group can be formed on the wall of the carbon nanotube 108. It can be understood that the functional group is a hydrophilic functional group, so that the carbon nanotubes 108 can be better dispersed in the pulp during the foaming process. The carbon nanotubes 108 may be one of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube, or any combination thereof. Wherein, 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 nm. ~50 nm. The length of the carbon nanotubes 108 is not limited. Preferably, the carbon nanotubes 108 have a length greater than 200 microns. It can be understood that the use of the carbon nanotubes 108 having a length of more than 200 micrometers can effectively exert the reinforcing effect of the carbon nanotubes 108 and improve the strength of the centering fins 100. In this embodiment, the carbon nanotubes 108 have a length of 200 micrometers to 900 micrometers.

The paper substrate 106 has a mass percentage of 10% to 99.9% in the entire centering piece 100, and the carbon nanotubes 108 has a mass percentage of 0.1% to 90% in the entire centering piece 100. Preferably, the paper substrate 106 has a mass percentage of 60% to 90%. The carbon nanotubes 108 have a mass percentage of 10% to 40%. For example, the material of the paper substrate 106 is wood fiber and pectin. The paper substrate 106 may have a mass percentage of 70% in the whole centering piece 100, and the carbon nanotubes 108 are in the centering branch. The mass percentage content in the sheet 100 may be 30%; the material of the paper base 106 is carbon fiber and resin, and the mass percentage of the paper base 106 in the entire centering piece 100 may be 80%, the nanometer The mass percentage of the carbon tube 108 in the entire centering piece 100 may be 20%; the material of the paper substrate 106 is polypropylene fiber and pectin, and the quality of the paper substrate 106 in the entire centering piece 100 The percentage content may be 90%, and the mass percentage of the carbon nanotubes 108 in the entire centering piece 100 may be 10%. In this embodiment, the paper substrate 106 is wood fiber, the paper base 106 has a mass percentage of 85% in the entire centering piece 100, and the carbon nanotubes 108 are in the entire centering piece 100. The mass percentage can be 15%.

The shape and size of the centering piece 100 are not limited, and can be prepared according to actual needs. The centering piece 100 may have a vibration pattern, and the geometry of the centering piece 100 includes a zigzag shape, a wave shape, an involute shape, or the like. In this embodiment, the centering piece 100 is a wave-shaped annular piece having a cross section alternated with a wave and a valley, and the centering piece 100 has a through hole 102 at the center thereof. The size and shape of the through hole 102 correspond to the size of the voice coil bobbin in the speaker so that the voice coil bobbin can pass through the through hole 102 when the speaker is assembled. The centering piece 100 can be formed by hot pressing. The thickness of the centering piece 100 is 1 μm or more and 2 mm or less.

Further, the centering piece 100 may be provided with a plurality of wires (not shown). The wire is used to supply current to the voice coil to move the voice coil in the magnetic field. The wire is fixed to the surface of the centering piece 100 by a bonding agent. Fixing the wire on the centering piece 100 can reduce the tension of the wire during the vibration process, so that the connection between the wire and the component such as the voice coil is not easily broken.

Referring to FIG. 3, the present invention further provides a method for preparing the centering support piece 100, which specifically includes the following steps:

Step 1: Beat the pulp.

The fiber material for papermaking is placed in a beater containing water, and the pulp is refined to obtain a pulp. The beating refining time may be greater than 5 hours. In this example, 20 grams of wood fiber and 1500 grams of water were placed in a beater for pulping and refining for 10 hours. It can be understood that the fiber material can be cooked by using a mixture of sodium hydroxide and sodium sulfide before beating. In the cooking process, since the action of the liquid is relatively mild, the fiber is not strongly eroded, so it is strong and strong, and the made paper has excellent folding resistance, breakage resistance and tear resistance. Further, in the embodiment, the pulp after refining can be placed in a closed container to apply a high pressure, and then the closed container is instantaneously opened to a normal pressure, and the pressure is sharply changed to promote fiber cracking and refinement in the pulp.

Step 2: Foaming.

The pulp which has been beaten and refined is placed in a bubble pool, and after adding the carbon nanotubes and adding materials, it is immersed for a while.

The carbon nanotubes can be prepared by an arc discharge method, a laser evaporation method, or a chemical vapor deposition method. In this embodiment, the carbon nanotube array is grown by chemical vapor deposition, and then the carbon nanotubes in the carbon nanotube array are scraped off. Since the carbon nanotubes in the carbon nanotube array are aligned and are not entangled with each other, it is advantageous for the carbon nanotubes to be dispersed in the solution. In this embodiment, 3.53 grams of carbon nanotubes are added to the pulp after pulping and refining for 1 day to 3 days.

In addition, a step of purifying a pair of the above carbon nanotubes may be further included before the carbon nanotubes are added to the slurry. The method for purifying a carbon nanotube includes the steps of: heating a carbon nanotube in an air stream to remove amorphous carbon; soaking the carbon nanotube with a concentrated acid to remove a metal catalyst; and repeatedly washing and filtering to obtain a purified naphthalene Carbon tube.

In this embodiment, the carbon nanotubes are placed in a furnace at 350 ° C, heated in an air stream for 2 hours to remove residual amorphous carbon in the carbon nanotubes; the carbon nanotubes are immersed in 36% concentrated hydrochloric acid About one day, the metal catalyst remaining in the carbon nanotubes is removed; the carbon nanotubes after the hydrochloric acid immersion are centrifuged; the separated carbon nanotube precipitates are repeatedly washed with deionized water; The carbon nanotube precipitate was filtered through a 0.2 mm pore size polytetrafluoroethylene membrane to obtain a purified carbon nanotube.

The purpose of purification is mainly to remove impurities such as amorphous carbon and metal catalyst remaining in the carbon nanotubes. By purifying, a pure carbon nanotube can be obtained.

Further, after purifying the carbon nanotubes, a step of functionalizing a pair of carbon nanotubes is also included. The method for functionalizing the carbon nanotubes comprises the steps of: refluxing the purified carbon nanotubes in a strong acid and washing and filtering to obtain a carbon nanotube with a functional group.

The strong acid includes one or more of concentrated sulfuric acid, concentrated nitric acid or concentrated hydrochloric acid. The purpose of the functionalization process is to introduce a functional group into the surface of the carbon nanotube. The carbon nanotubes treated by the above functionalization method introduce a hydrophilic functional group on the tube wall. The functional group includes one or more of a carboxyl group (-COOH), a hydroxyl group (-OH), an aldehyde group (-CHO), and an amino group (-NH ₂ ). The carbon nanotubes after introducing a hydrophilic functional group on the wall of the carbon nanotube tube can be uniformly dispersed in the pulp during the foaming process.

In this embodiment, the purified carbon nanotubes were placed in a 500 ml round bottom flask, and 150 ml of a concentrated sulfuric acid and concentrated nitric acid mixture (the volume of concentrated sulfuric acid and concentrated nitric acid was 3:1) was weighed into a round bottom flask. , reflux reaction for 4 hours to 20 hours. This refluxing reaction process imparts a functional group to the surface of the carbon nanotube. Then, the reacted liquid was poured into water, and then filtered through a filter paper to obtain a carbon nanotube filter cake. Finally, the carbon nanotube filter cake was washed with deionized water to a neutral pH to obtain a carboxylated carbon nanotube.

Step 3: Papermaking.

The soaked pulp is salvaged to a metal mold or placed on a screen of a metal mold by a papermaking process to remove moisture and build up materials to form a centering piece preform. Referring to FIG. 4, in the present embodiment, the soaked pulp 202 is loaded into the metering tank 200 of a papermaking device 20. The pulp 202 is introduced into a papermaking slot 206 through a supply tube 204. The amount of pulp 202 entering the papermaking slot 206 can be controlled by the first control valve 208 to control the thickness of the centering segment preform. An appropriate amount of water was added to the papermaking tank 206 to dilute the pulp 202, and the mixture was stirred uniformly. The pulp 202 can be more uniformly dispersed by dilution and uniformly deposited on the papermaking mold 214 in the subsequent step. The second control valve 210 is opened to allow water to exit the papermaking tray 206 through the drain pipe 212 while the pulp 202 is deposited on the papermaking mold 214 in the papermaking tray 206. Centering segment preforms of different shapes and sizes can be obtained by selecting different papermaking dies 214. It can be understood that in this embodiment, the diluted pulp 202 can be directly loaded into a metering tank 200, and then controlled by the first control valve 208 to allow a certain amount of pulp 202 to enter the papermaking slot 206.

It can be understood that in this embodiment, the pulp 202 can be diluted with water and then placed in a container (not shown), and a paper net (not shown) is placed in the container and then taken out, so that the pulp 202 is deposited thereon. A paper web is formed to form a centering piece preform.

Step 4: Forming.

The centering piece preform is heated and pressurized by a hot pressing process to evaporate the remaining water. In this embodiment, the papermaking mold is heated to a range of 100 ° C to 200 ° C, and a pressure of 1000 Newtons to 6000 Newtons is applied for 10 seconds to 100 seconds. It can be understood that in this embodiment, the stacked centering piece preforms can be naturally dried or dried without the step of hot pressing.

In the molding process, a centering support preform having a through hole 102 can be directly prepared by selecting a papermaking mold 214. It can be understood that in the embodiment, the centering piece preform without the through hole can be prepared first, and then the through hole 102 is obtained by punching.

Step 5: Follow-up processing.

The centering piece 100 is obtained by a punching process. In addition, a pattern can be further printed on the prepared centering piece 100. The printing pattern refers to forming a polymer ink or paint on the surface of the centering piece 100 to improve the waterproofness and beauty of the centering piece 100.

Referring to FIG. 5 and FIG. 6 , an embodiment of the present invention further provides a speaker 10 to which the centering support 100 is applied. The speaker 10 includes a bracket 110, a magnetic circuit system 120, a voice coil 130, a centering piece 100, a diaphragm 150, and a voice coil bobbin 140. The bracket 110 is fixed to the magnetic circuit system 120. An edge of the diaphragm 150 is fixed to the bracket 110 and is fixed to the voice coil bobbin 140 at the center. The edge of the centering piece 100 is fixed to the bracket 110, and the through hole 102 is sleeved on the voice coil bobbin 140. The voice coil 130 is disposed on an outer surface of the voice coil bobbin 140 adjacent to one end of the magnetic circuit system 120 and is received in the magnetic circuit system 120.

The bracket 110 can be a pyramid structure having a central hole 111 for arranging the magnetic circuit system 120 such that the bracket 110 is relatively fixed to the magnetic circuit system 120.

The magnetic circuit 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 the magnetic conductive 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 enclose a cylindrical space in the magnetic circuit system. The magnetic core stud 124 is received in the cylindrical space. The magnetic core stud 124 is integral with the magnetic conductive lower plate 121 and extends from the magnetic conductive lower plate 121 to the magnetic conductive upper plate 122. An annular magnetic field gap 125 is formed between the magnetic core stud 124 and the magnet 123 for accommodating the voice coil 130. The magnetic core stud 124 extends into the central bore 111.

The voice coil 130 is a driving unit of the speaker 10 and is disposed on the voice coil bobbin 140. The voice coil 130 disposed on the voice coil bobbin 140 can be received in the magnetic field gap 125 and moved up and down in the magnetic field gap 125. The voice coil 130 is formed by winding a thinner wire on the voice coil bobbin 140. Preferably, the wire may be an enameled wire. When the voice coil 130 receives an audio electrical signal, the voice coil 130 produces a magnetic field that varies with the intensity of the audio electrical signal that occurs between the magnetic field generated by the magnetic circuit system 120 and the magnetic field gap 125. The interaction forces the voice coil 130 to vibrate.

The voice coil bobbin 140 is a hollow tubular structure that is disposed concentrically with the magnetic core stud 124 and spaced apart from the magnetic core stud 124 . The voice coil bobbin 140 can be received in the magnetic field gap 125. The voice coil bobbin 140 is fixedly connected to the voice coil 130, and one end of the voice coil bobbin 140 away from the magnetic circuit system 120 is fixedly connected to a center position of the vibrating membrane 150, so that when the voice coil bobbin 140 is sounded When the ring 130 vibrates, the diaphragm 150 is driven to vibrate, thereby moving the air around the diaphragm 150 to generate sound waves.

The diaphragm 150 is a sounding unit of the speaker 10. The shape of the diaphragm 150 is not limited, and is related to its specific application. For example, when the diaphragm 150 is applied to the large speaker 10, the diaphragm 150 may be a hollow cone structure; when the diaphragm 150 is applied to the micro speaker At 10 o'clock, the diaphragm 150 may have a disk-like structure. The top end of the diaphragm 150 is fixedly coupled to the voice coil bobbin 140 by bonding, and the outer edge of the other end is movably connected to the bracket 110. In this embodiment, the diaphragm 150 is a hollow cone structure.

The centering piece 100 is sleeved on the voice coil bobbin 140 by a through hole 102, and an outer edge of the centering piece 100 is fixed to an end of the centering bracket 110 near the center hole 111. The centering support piece 100 is for supporting the voice coil bobbin 140 and functions as a lateral limit on the voice coil bobbin 140. The centering piece 100 has greater elasticity and strength. Since the voice coil 130 is wound around the voice coil bobbin 140, the voice coil 130 can freely move up and down in the magnetic field gap 125 without lateral direction. Move to prevent the voice coil 130 from touching the magnetic circuit system 120. Since the centering piece 100 is disposed between the magnetic circuit system 120 and the diaphragm 150 and covers the magnetic field gap 125, the centering piece 100 also has a function of preventing dust from entering the magnetic field gap 125. .

The centering piece 100 also affects the resonant frequency of the diaphragm 150 and the voice coil 130 in the speaker 10. Specifically, the centering piece 100 cooperates with the diaphragm 150 and the voice coil 130 to determine the resonant frequency of the speaker 10. The factors affecting the resonant frequency include the geometry of the centering struts 100 in addition to the properties of the material of the centering struts 100.

It is to be understood that the speaker 10 to which the centering piece 100 is applied is not limited to the above structure, and the centering piece 100 can also be applied to a microspeaker using a planar diaphragm.

The centering support piece and the speaker using the same are provided with the following advantages: First, since the carbon nanotube has excellent strength, dispersing the carbon nanotube in the paper base can improve The strength of the paper substrate, so that the centering piece composed of the paper base can better cushion and position the voice coil skeleton. Secondly, because the carbon nanotubes have good flexibility, the carbon nanotubes are dispersed in the matrix of the centering support, which can improve the fatigue resistance of the matrix, so that the centering fins are not easily fatigued in repeated vibrations. The deformation, and thus the collapse of the axial direction of the speaker, is not easy to occur, thereby contributing to the improvement of the service life of the speaker using the centering piece. Third, since the carbon nanotubes have a small density, the carbon nanotubes are dispersed in the matrix of the centering piece, and the weight of the centering piece can be reduced while maintaining or even increasing the strength of the centering piece. To reduce the weight of the speaker. This effect is more pronounced especially in microspeakers. Fourthly, since the carbon nanotubes have good moisture resistance and flame resistance, the carbon nanotubes are uniformly dispersed in the matrix of the centering piece, so that the centering piece provided by the embodiment of the invention also has good resistance. Wet and flame resistant.

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 persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧ Speaker
100‧‧‧ Centering piece
102‧‧‧through hole
106‧‧‧paper base
108‧‧‧Nano Carbon Tube
110‧‧‧ bracket
111‧‧‧ center hole
120‧‧‧ Magnetic circuit system
121‧‧‧Magnetic lower plate
122‧‧‧Magnetic upper plate
123‧‧‧ magnet
124‧‧‧magnetic core column
125‧‧‧ Magnetic field gap
130‧‧‧ voice coil
140‧‧‧ voice coil skeleton
150‧‧‧Vibration film
20‧‧‧Papering device
200‧‧‧ metering tank
202‧‧‧Pulp
204‧‧‧Supply tube
206‧‧‧Paper slot
208‧‧‧First control valve
210‧‧‧Second control valve
212‧‧‧Drainage pipe
214‧‧‧Paper mold

FIG. 1 is a schematic structural diagram of a centering piece according to an embodiment of the present invention.

Figure 2 is a cross-sectional view of the centering gusset of Figure 1 taken along line II-II.

FIG. 3 is a flow chart of a method for preparing a centering piece according to an embodiment of the present invention.

Fig. 4 is a schematic view showing the structure of a papermaking device used in the papermaking step of Fig. 3.

FIG. 5 is a schematic structural view of a speaker to which a centering piece of an embodiment of the present invention is applied.

Figure 6 is a cross-sectional view of the speaker shown in Figure 5.

100‧‧‧ Centering piece

106‧‧‧paper base

108‧‧‧Nano Carbon Tube

Claims (24)

A centering support sheet is improved in that the centering support piece comprises a paper base and a plurality of carbon nanotubes dispersed in the paper base. The centering slab of claim 1, wherein the paper substrate comprises a fibrous material and an additive material. The centering piece according to claim 2, wherein the fiber material comprises one or more of wood fiber, carbon fiber, glass fiber, nylon fiber, polypropylene fiber, cotton fiber, and bamboo fiber. The centering piece according to claim 2, wherein the additive material comprises one or more of hemicellulose, lignin, resin, pigment, pectin and ash. The centering piece according to claim 1, wherein the paper substrate has a mass percentage of 10% to 99.9% in the entire centering piece. The centering piece according to claim 5, wherein the paper substrate has a mass percentage of 60% to 90% in the entire centering piece. The centering piece according to claim 1, wherein the carbon nanotube comprises one of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube, or any combination. The centering segment of claim 1, wherein the carbon nanotubes have a length greater than 200 microns. The centering piece according to claim 1, wherein the carbon nanotubes have a mass percentage of 0.1% to 90% in the entire centering piece. The centering piece according to claim 9, wherein the carbon nanotubes have a mass percentage of 10% to 40% in the entire centering piece. The centering piece according to claim 1, wherein the surface of the carbon nanotube has a functional group, and the functional group includes one or more of a carboxyl group, a hydroxyl group, an aldehyde group, and an amino group. The centering piece according to claim 1, wherein the paper substrate is made of wood fiber and pectin, and the mass percentage of the whole centering piece is 70%, the nano carbon The mass percentage of the tube in the entire centering piece is 30%. The centering piece according to claim 1, wherein the paper substrate is made of carbon fiber and resin, and the mass percentage of the whole centering piece is 80%, and the carbon nanotube is The mass percentage in the entire centering piece is 20%. The centering piece according to claim 1, wherein the paper substrate is made of polypropylene fiber and pectin, and the mass percentage of the whole centering piece is 90%, the nanometer. The carbon tube has a mass percentage of 10% in the entire centering piece. The centering piece according to claim 1, wherein the paper substrate is wood fiber, and the mass percentage of the whole centering piece is 85%, and the carbon nanotube is centered. The mass percentage in the support can be 15%. The centering piece according to claim 1, wherein the centering piece has a vibration pattern. The centering segment of claim 1, wherein the geometry of the centering segment surface comprises a zigzag shape, a wave shape or an involute shape. The centering piece according to claim 17, wherein the centering piece having a wave shape is a ring piece having a cross section alternating with a wave peak and a wave valley, and the centering piece is There is a through hole in the center. The centering piece according to claim 1, wherein the centering piece has a thickness of 1 μm or more and 2 mm or less. A centering support piece is improved in that the centering support piece comprises a sheet-like structure composed of a carbon nanotube paper, and the sheet-like structure has a through hole at the center thereof. The centering piece according to claim 20, wherein the carbon nanotube paper comprises a paper substrate and a plurality of carbon nanotubes dispersed in the paper substrate. A speaker comprising:
a voice coil;
a voice coil skeleton, the voice coil is disposed on the voice coil skeleton;
a vibrating membrane connected to one end of the voice coil bobbin;
a centering piece, the centering piece is sleeved on the voice coil bobbin; and a magnetic field system, the magnetic field system has a magnetic field gap, and the voice coil is disposed in the magnetic field gap;
The improvement is that the centering support comprises a paper substrate and a plurality of carbon nanotubes dispersed in the paper substrate. A speaker comprising:
a voice coil;
a voice coil skeleton, the voice coil is disposed on the voice coil skeleton;
a vibrating membrane connected to one end of the voice coil bobbin;
a centering piece, the centering piece is sleeved on the voice coil bobbin; and a magnetic field system, the magnetic field system has a magnetic field gap, and the voice coil is disposed in the magnetic field gap;
The improvement is that the centering piece comprises a sheet-like structure composed of a carbon nanotube paper, and the sheet-like structure has a through hole at the center. The speaker of claim 23, wherein the carbon nanotube paper comprises a paper substrate and a plurality of carbon nanotubes dispersed in the paper substrate.