TWI448168B - Damper and speaker using the same - Google Patents

Description

Centering piece and speaker using the centering piece

The present invention relates to a sound emitting device, and more particularly to a centering support and a speaker using the same.

A speaker is an electroacoustic device that converts an electrical signal into an acoustic signal. Specifically, the speaker can convert a range of audio electric power signals into a audible sound having a small distortion and a sufficient sound pressure level through a transducing mode. According to the working principle of the speaker, the previous speakers can be divided into electric, piezoelectric and electrostatic speakers. Among them, the electric speaker is simple in structure, excellent in sound quality and low in cost, so it is the most widely used.

The electric speaker usually includes a voice coil, a voice coil bobbin, a magnetic field system, a centering piece and a diaphragm. The voice coil is wound around the periphery of one end of the voice coil bobbin. The voice coil bobbin is connected to the diaphragm. The movement of the voice coil fixed on the voice coil bobbin under the magnetic field generated by the magnetic field system pushes the diaphragm to vibrate and emit sound waves.

The volume of the speaker is an important indicator of the performance of the speaker. The volume of the speaker is related to the input power and the electroacoustic conversion efficiency. When other conditions are met, the higher the input power, the higher the electro-acoustic conversion efficiency, and the louder the speaker emits. However, when the input power is increased, the components in the speaker such as the centering piece and the diaphragm connected to the centering piece are liable to be deformed or even broken, thereby causing distortion of the sound emitted by the speaker. Therefore, the strength of each component in the loudspeaker determines the determinant of its rated power. The rated power is the input power that does not distort the speaker. In addition, the speaker The electroacoustic conversion efficiency is related to the weight of the components in the speaker, in particular, the weight of the diaphragm per unit area and the weight of the centering piece for damping the diaphragm. Therefore, the strength and weight of the centering piece for buffering the diaphragm affects an important factor of the volume of the speaker. The weight of the centering piece is related to its thickness and density. Therefore, the greater the strength of the centering piece, the smaller the thickness and density, the greater the volume of the speaker. In general, the greater the specific strength (ratio of strength and density) of the centering piece, the smaller the thickness, the greater the volume of the speaker.

In the prior art, the centering pieces are mostly made of pure cotton cloth and blended cloth. However, the previous centering slab is limited by the specific strength of the material, and its input power cannot be further improved. The input power of a typical micro speaker is only 0.3W~0.5W. On the other hand, the previous centering piece wants to achieve a certain specific strength, which inevitably requires a large thickness, which in turn leads to a large weight of the centering piece, so that the electroacoustic conversion efficiency of the speaker cannot be further improved. Therefore, in order to increase the input power and conversion efficiency, and thereby increase the volume of the speaker, it is necessary to further increase the specific strength of the centering piece and reduce the weight of the centering piece.

In view of the above, it is necessary to provide a centering piece and a speaker using the centering piece which can solve the above problems, and the centering piece contains a carbon nanotube, and thus has a large specific strength and a small quality. .

a centering piece having a vibration pattern, and having a through hole at a center of the centering piece, wherein the centering piece includes at least one carbon nanotube structure and a base body, wherein The carbon nanotube structure includes a plurality of carbon nanotubes having a gap between the carbon nanotubes, and the matrix is filled in a gap between the carbon nanotubes.

A centering piece comprising at least one base, the base being a ring having a through hole a sheet body, and the cross section of the base body is a wave shape having a center of symmetry of the through hole, wherein the centering piece further includes a carbon nanotube structure, and the carbon nanotube structure includes a plurality of nano tubes There is a gap between the carbon tube and the carbon nanotube, and the substrate is filled in the gap between the carbon nanotubes.

A speaker using the centering piece includes: a bracket, a voice coil, a voice coil bobbin, a centering piece, a diaphragm, and a magnetic circuit system. The magnetic circuit system has a magnetic field gap in which the voice coil is disposed. One end of the centering piece is fixed to the bracket, and the other end is fixed on the voice coil bobbin. The centering piece includes at least one carbon nanotube structure and a substrate, the carbon nanotube structure includes a plurality of carbon nanotubes, and there is a gap between the carbon nanotubes, and the substrate is filled in the carbon nanotube Between the gaps.

Compared with the prior art, since the carbon nanotube has excellent mechanical strength and small density, the specific strength of the carbon nanotube structure composed of the carbon nanotubes is large, thereby improving the structure and the matrix from the carbon nanotubes. The specific strength of the centering piece formed, or the weight of the centering piece and the speaker using the centering piece, while maintaining or even increasing the specific strength of the centering piece and the speaker using the centering piece .

10, 20, 30 ‧ ‧ centering piece

100‧‧‧Speakers

101, 201, 301‧‧‧ through holes

102, 202, 302‧‧‧ base

104, 304‧‧‧Nano Carbon Tube Structure

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

160‧‧‧Centering piece

204‧‧‧Nano carbon pipeline structure

1 is a schematic perspective view of a centering piece provided by a first embodiment of the present invention.

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

3 is a scanning electron micrograph of a carbon nanotube film taken by a centering piece provided by a first embodiment of the present invention.

4 is a partial cross-sectional structural view of a centering piece provided by a second embodiment of the present invention.

FIG. 5 is a cross-sectional structural view of a centering piece provided by a third embodiment of the present invention.

Fig. 6 is a perspective view showing the structure of a speaker to which a centering piece of an embodiment of the invention is applied.

Figure 7 is a cross-sectional structural view of the speaker of Figure 6.

The centering piece of the embodiment of the present invention and the speaker using the centering piece will be described in detail below with reference to the drawings.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , a first embodiment of the present invention provides a centering support piece 10 , and the shape and size of the centering support piece 10 are not limited, and can be prepared according to actual needs. The centering support 10 may have a vibration pattern, and the geometry of the vibration pattern of the centering support 10 includes a zigzag shape, a wave shape, an involute shape, or the like. The centering piece 10 has a through hole 101 at the center thereof. In this embodiment, the centering piece 10 is a ring piece having a wave shape in which the peaks and the valleys alternate. Specifically, the centering piece 10 is a ring body composed of a plurality of concentric rings, and the through hole 101 is located at the center of the concentric ring. The size and shape of the through hole 101 correspond to the size of the voice coil bobbin in the speaker, so that the voice coil bobbin can pass through the through hole 101 when the speaker is assembled. The centering support 10 can be formed by hot pressing. The thickness of the centering piece 10 is 1 μm or more and 2 mm or less.

Further, the centering piece 10 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 support 10 by an adhesive. Fixing the wire on the centering piece 10 can reduce the tension applied to 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.

In this embodiment, the centering support 10 includes at least one carbon nanotube structure 104 and a base 102, wherein the carbon nanotube structure 104 is disposed in the base 102.

The substrate 102 includes a polymer film, paper, metal layer or metal sheet, and the like. Specifically, the substrate 102 may include a polyimide film, a polyester film, an aluminum film, or the like. In this embodiment, the substrate 102 is a polyimide film. The polyimine has a small density (only 1.35 g/cm 3 ), which is advantageous in reducing the weight of the centering support 10 and increasing its specific strength.

The manner in which the carbon nanotube structure 104 is disposed in the substrate 102 is related to the specific material of the substrate 102. For example, when the substrate 102 is a liquid polymer, the at least one carbon nanotube structure 104 can be immersed in a liquid polymerization. After the polymer is completely infiltrated with the carbon nanotube structure 104, the carbon nanotube structure 104 is taken out, and the polymer is solidified to form a composite structure of the substrate 102 and the carbon nanotube structure 104; when the substrate 102 is In the case of a solid polymer, the substrate 102 may be covered on the surface of the carbon nanotube structure 104, and the carbon nanotube structure 104 may be composited with the substrate 102 by heating and pressing, and then cooled to form a matrix 102 and a carbon nanotube structure. The composite structure of 104; when the substrate 102 is a metal, the substrate 102 may be deposited onto the surface of the carbon nanotube structure 104 by physical vapor deposition, and combined with the carbon nanotube structure 104. In the above process, the carbon nanotube structure 104 includes a plurality of carbon nanotubes having a gap between the carbon nanotubes, so that the matrix material 102 can penetrate into the carbon nanotube structure 104 and be filled in the adjacent naphthalene. The carbon nanotubes are coated or coated on the surface of the carbon nanotubes to form a composite structure. In the composite structure, the carbon nanotube structure 104 can be tightly bonded to the substrate 102.

When the carbon nanotube structure 104 is combined with the substrate 102 by heating and pressing, the heating temperature should be higher than the glass transition temperature of the polymer by 20 ° C to 50 ° C and lower than the decomposition temperature of the polymer. The polymer becomes a flowable liquid at this temperature. The pressure can be from 3 to 10 atmospheres.

The preparation method of the centering piece 10 is not limited. Specifically, the method for preparing the centering piece 10 may be a pleating process of forming a composite structure formed by the carbon nanotube structure 104 and a substrate 102. A wavy annular structure, the annular structure being a plurality of concentric rings. 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 101 is obtained by punching.

The carbon nanotube structure 104 includes a plurality of carbon nanotubes having a gap between the carbon nanotubes, and the matrix material may be filled in a gap between the carbon nanotubes or cover part or all of the carbon nanotubes. Additionally, the carbon nanotube structure 104 can also be disposed in the substrate 102.

Further, the surface of the carbon nanotube structure 104 may be coated or deposited with a material such as metal, diamond, boron carbide or ceramic to form a reinforcing layer. The reinforcing layer has the effect of tightly bonding the substrate 102 and the carbon nanotube structure 104 together. Preferably, the material of the reinforcing layer should be better combined with the substrate 102 or have better compatibility. For example, when the substrate 102 is made of metal, the material of the reinforcing layer may preferably be the same with the substrate 102. The same metal, such that the carbon nanotube structure 104 and the substrate 102 can be more tightly bonded.

The centering support 10 includes a plurality of the carbon nanotube structures 104. The carbon nanotube structures 104 are layered, and the plurality of carbon nanotube structures are attached or spaced apart from each other in the base material. The carbon nanotube structure 104 includes at least one carbon nanotube film. Specifically, the carbon nanotube structure 104 may include one or a plurality of laminated carbon nanotube membranes. The carbon nanotubes in the carbon nanotube structure 104 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, and the double-walled carbon nanotube has a diameter of 1.0 nm. ~50 nm, the multi-walled carbon nanotubes have a diameter of 1.5 nm to 50 nm.

The carbon nanotube membrane comprises uniformly distributed carbon nanotubes, and the carbon nanotubes are tightly bonded by van der Waals force. There is a gap between the carbon nanotubes. The carbon nanotubes in the carbon nanotube film are disordered or ordered. The so-called disordered arrangement means that the arrangement direction of the carbon nanotubes is irregular. The so-called ordered arrangement means that the arrangement direction of the carbon nanotubes is regular. Specifically, when the carbon nanotube structure 104 includes a disordered arrangement of carbon nanotubes, the carbon nanotubes are intertwined or isotropically aligned; when the carbon nanotube structure 104 includes an ordered array of carbon nanotubes The carbon nanotubes are arranged in a preferred orientation in one direction or in a plurality of directions. The carbon nanotube film comprises one or more of a carbon nanotube film, a carbon nanotube film, and a carbon nanotube disorder film.

The carbon nanotube film is directly obtained by drawing an array of carbon nanotubes. The carbon nanotube film comprises a plurality of carbon nanotubes arranged in a preferred orientation, and the carbon nanotubes are connected end to end by Van der Waals force. Specifically, each carbon nanotube film comprises a plurality of continuous and aligned carbon nanotube segments. The plurality of carbon nanotube segments are connected end to end by Van der Valli. Each carbon nanotube segment comprises a plurality of mutually parallel carbon nanotubes, and the plurality of parallel carbon nanotubes are tightly coupled by van der Waals force. The carbon nanotube segments have any width, thickness, uniformity, and shape. The carbon nanotubes in the carbon nanotube film are arranged in a preferred orientation in the same direction. There is a certain gap between adjacent carbon nanotube films or between adjacent carbon nanotubes in a carbon nanotube film. It can be understood that the carbon nanotube structures of different areas and thicknesses can be prepared by laying the plurality of carbon nanotube films in parallel and without gaps laying and/or laminating. When the carbon nanotube structure 104 includes a plurality of stacked carbon nanotube film, the arrangement direction of the carbon nanotubes in the adjacent carbon nanotube film forms an angle α, which is greater than or equal to 0 degrees and less than Equal to 90 degrees. Multi-layer laminated carbon nanotube film, especially multi-layer cross design The disposed carbon nanotube film has higher strength than the single-layer carbon nanotube film, thereby facilitating the improvement of the specific strength of the centering piece. For the structure of the carbon nanotube film and the preparation method thereof, please refer to the application of the patent application of the Republic of China on the Chinese patent application No. 200833862, which was filed on Feb. 12, 2007 by Fan Shoushan et al.

The carbon nanotube rolled film includes a uniformly distributed carbon nanotube. The carbon nanotube rolled film may be isotropic or include carbon nanotubes arranged in the same direction or in different directions. The carbon nanotubes in the carbon nanotube rolled film overlap each other. The carbon nanotube rolled film can be obtained by rolling an array of carbon nanotubes. The carbon nanotube array is formed on a surface of the substrate, and the carbon nanotubes in the prepared carbon nanotube rolled film form an angle β with the surface of the substrate of the carbon nanotube array, wherein β is greater than or equal to 0 degrees. And less than or equal to 15 degrees. Preferably, the carbon nanotubes in the carbon nanotube rolled film are parallel to the surface of the carbon nanotube rolled film or the substrate. The carbon nanotubes in the carbon nanotube rolled film have different arrangements depending on the manner of rolling. Since the carbon nanotubes in the carbon nanotube film are attracted to each other by the van der Waals force, the carbon nanotube film is a self-supporting structure, which can be self-supported without substrate support. Support exists. For the carbon nanotube rolled film and the preparation method thereof, please refer to the Patent Application No. 200900348 of the Republic of China, which was filed on Jan. 29, 2007 by Fan Shoushan et al.

The carbon nanotube disorder film comprises a carbon nanotube flocculation membrane and a carbon nanotube membrane formed by a spray coating method. The length, width and thickness of the carbon nanotube disorder film are not limited, and may be selected according to actual needs. The carbon nanotube flocculation membrane comprises intertwined carbon nanotubes, and the carbon nanotubes may be longer than 10 microns. The carbon nanotubes are attracted and entangled by van der Waals forces to form a network structure. The carbon nanotube flocculation membrane is isotropic. The carbon nanotubes in the carbon nanotube flocculation membrane are uniformly distributed, and the irregular rows are arranged. Columns form a large number of microporous structures with a pore size of from 1 nm to 0.5 μm. For the carbon nanotube flocculation membrane and the preparation method thereof, please refer to the patent application of the Republic of China patent No. 200844041, which was filed on May 11, 2007, by Fan Shoushan et al. The carbon nanotubes in the carbon nanotube film formed by the spray coating method are bonded to each other by a binder. The carbon nanotubes are randomly arranged in the carbon nanotube film.

Referring to FIG. 4, a second embodiment of the present invention provides a centering support piece 20, which is a wave-shaped annular piece body, and the plurality of circular rings in the annular piece body are a plurality of concentric rings. The core support 20 has a through hole 201, wherein the centering support 20 includes at least one carbon nanotube structure and a base 202, wherein the carbon nanotube structure is disposed in the base 202.

The structure of the centering support piece 20 in the second embodiment of the present invention is substantially similar to the structure of the centering support piece 10 in the first embodiment of the present invention, except that the carbon nanotube structure includes a plurality of nano carbons. Pipeline structure 204. The plurality of nanocarbon line-like structures 204 may be disposed in parallel, crosswise, or interwoven in the base 202. The material of the substrate 202 may be filled in a gap between a plurality of parallel arranged, cross-arranged or interwoven nanocarbon line-like structures 204, in a gap between the carbon nanotubes in the nanocarbon line-like structure 204. Or / and cover a portion of the carbon nanotubes in the nanocarbon line structure 204. Specifically, the plurality of nanocarbon line-like structures 204 may be disposed in parallel, intersected, or woven together to form a planar structure, and then the planar structure is composited with the substrate 202. This composite method is similar to the method in which the carbon nanotube structure 204 and the matrix 202 are combined in the first embodiment.

The nanocarbon line-like structure 204 includes at least one nanocarbon line. The nanocarbon line-like structure 204 has a diameter of 0.5 nm to 1 mm. The nanocarbon line-like structure 204 includes a bundle structure composed of a plurality of carbon nanotubes arranged in parallel or by a plurality A twisted wire structure in which nano carbon pipes are twisted to each other. The nanocarbon line can be a non-twisted nano carbon line or a twisted nano carbon line.

The non-twisted nanocarbon pipeline includes a plurality of carbon nanotubes arranged along the length of the non-twisted nanocarbon pipeline. The non-twisted nano carbon line can be obtained by treating the carbon nanotube film with an organic solvent. Specifically, the carbon nanotube film comprises a plurality of carbon nanotube segments, and the plurality of carbon nanotube segments are connected end to end by Van der Waals force, and each of the carbon nanotube segments includes a plurality of parallel and through Van der Waals force Tightly bonded carbon nanotubes. There is a gap between adjacent carbon nanotubes in the nanocarbon pipeline. The carbon nanotube segments have any length, thickness, uniformity, and shape. The non-twisted nanocarbon line is not limited in length and has a diameter of 0.5 nm to 100 μm. Specifically, the organic solvent may be immersed in the entire surface of the carbon nanotube film, and the parallel carbon nanometer carbon in the carbon nanotube film may be pulled under the surface tension generated by the volatile organic solvent volatilization. The tube is tightly bonded by van der Waals force, thereby shrinking the carbon nanotube film into a non-twisted nano carbon line. The organic solvent is a volatile organic solvent such as ethanol, methanol, acetone, dichloroethane or chloroform, and ethanol is used in this embodiment. The non-twisted nanocarbon line treated by the organic solvent has a smaller specific surface area and a lower viscosity than the carbon nanotube film which is not treated with the organic solvent.

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 axially arranged around the twisted nanocarbon pipeline. Further, the twisted nanocarbon line can be treated with a volatile organic solvent. Under the action of the surface tension generated by the volatilization of the volatile organic solvent, the adjacent carbon nanotubes in the treated twisted nanocarbon pipeline are tightly bonded by the van der Waals force, so that the specific surface area of the twisted nanocarbon pipeline Decrease, increase in density and strength. Adjacent nanocarbon in the twisted nanocarbon pipeline There is a gap between the tubes.

For the nano carbon pipeline and its preparation method, please refer to the patent filed by Fan Shoushan et al. on November 5, 2002, and announced on November 21, 2008, the publication number is I303239; and in 2005 12 The application for the month of July 16, 2009, announced on July 21, 2009, the announcement number is I312337 of the Republic of China patent.

It can be understood that the carbon nanotube structure 204 can also include a carbon nanotube mixed linear structure (not shown). The carbon nanotube hybrid linear structure comprises a bundle structure in which at least one nano carbon pipeline is arranged in parallel with at least one linear matrix or a twisted wire structure composed of at least one nano carbon pipeline and at least one linear matrix twisted with each other. . The material of the linear substrate may be the same as the material of the substrate 202. Preferably, the linear matrix needs to have better specific strength and a lower density. In addition, the linear substrate also needs to have good high temperature resistance, and preferably, it needs to withstand a high temperature of 250 ° C or higher.

The at least one nanocarbon line-like structure 204 may also be disposed in parallel with the at least one linear substrate, disposed in a crosswise manner or interwoven in the base body 202, and tightly bonded to the base body 202 by adhesive or heat pressing.

Referring to FIG. 5, a third embodiment of the present invention provides a centering piece 30. The centering support piece 30 includes a base body 302 and at least two carbon nanotube structures 304 composited with a carbon nanotube composite structure formed in the base body 302. The centering piece 30 has a through hole 301.

The centering support piece 30 of the third embodiment of the present invention is substantially similar in structure to the centering support piece 10 of the first embodiment, except that the centering support piece 30 includes at least two laminated carbon nanotube structures. 304 and two layers of carbon nanotube structures 304 are spaced apart. The carbon nanotube structure 304 may include at least one carbon nanotube film in the first embodiment, in the second embodiment A nanocarbon line-like structure and its combination. The composite of the substrate 302 and the carbon nanotube structure 304 can be achieved by repeating the above steps a plurality of times, or can be realized in one step, such as when the centering support 30 includes two spaced and stacked carbon nanotube structures 304. When the substrate 302 is a liquid polymer, the two carbon nanotube structures 304 can be disposed in the liquid polymer. After the liquid polymer infiltrates the two carbon nanotube structures 304, the polymer is cured. , get a composite structure. In addition, the gas between the carbon nanotubes in the carbon nanotube structure 304 can be further discharged by vacuuming the carbon nanotube structure 304 and the liquid polymer before curing, thereby making the liquid polymer better. The ground is immersed in the gap between the carbon nanotubes.

Alternatively, the at least two carbon nanotube structures 304 may be stacked, coplanar, or parallel in the substrate, and the adjacent two carbon nanotube structures 304 may be spaced or conformed in the substrate. .

In this embodiment, the centering support piece 30 includes two carbon nanotube structures 304 that are spaced apart and compounded in the base body 302.

Referring to Figures 6 and 7, the present invention further provides a speaker 100 to which the above-described centering piece is applied. The speaker 100 includes a bracket 110, a magnetic circuit system 120, a voice coil 130, a voice coil bobbin 140, a diaphragm 150, and a centering piece 160. The bracket 110 is fixed to the magnetic circuit system 120. The voice coil 130 is disposed on an outer surface of one end of the voice coil bobbin 140 and is received in the magnetic circuit system 120. The outer edge of the diaphragm 150 is fixed to the bracket 110, and the diaphragm 150 is connected to one end of the voice coil bobbin 140.

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 120. The magnetic core block 124 is received in the cylindrical space, and extends from the magnetic conductive 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 circuit system 120 is sleeved and fixed to the central hole 111 of the bracket 110 near one end of the magnetic conductive upper plate 122.

The voice coil 130 disposed on the voice coil bobbin 140 is received in the magnetic field gap 125, which is a driving unit of the speaker 100, and the voice coil 130 is wound on the voice coil bobbin 10 by a thin wire. And formed. Preferably, the wire may be an enameled wire. When the voice coil 130 receives the audio signal, the voice coil 130 generates a magnetic field that varies with the intensity of the audio signal, and the changed magnetic field is between the magnetic field generated by the magnetic circuit system 120 in the magnetic field gap 125. An interaction occurs that forces the voice coil 130 to vibrate.

The diaphragm 150 is a sounding unit of the speaker 100. 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 100, the diaphragm 150 may be a hollow cone structure; when the diaphragm 150 is applied to the micro speaker At 100 o'clock, the diaphragm 150 may have a disk-like structure. The top end of the diaphragm 150 is fixed 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 160 is a circular piece having a wavy cross section, which is composed of a plurality of concentric The ring is composed. The centering support piece 160 includes any of the centering pieces of the first to third embodiments. The through hole 101 of the centering piece 160 is sleeved on the voice coil bobbin 140, and the outer edge of the centering piece 160 is fixed at one end of the bracket 110 near the center hole 111 of the bracket 110. The centering piece 160 has large radial rigidity and small axial rigidity, so that the voice coil 130 can freely move up and down in the magnetic field gap 125 without lateral movement, avoiding the voice coil 130 and magnetic The road system 110 is in contact, so that the speaker has good mechanical strength and electroacoustic characteristics. Since the centering piece 160 has a plurality of ring-shaped vibrating lines, the centering piece 160 has good elasticity, and is connected to the diaphragm 150, and functions to buffer the vibration of the diaphragm 150. Another function of the centering struts 160 is to prevent external dust from entering the magnetic field gap 125.

The centering support 10 also affects the resonant frequency of the diaphragm 150 and the voice coil 130 in the speaker 100. Specifically, the centering support 10 and the diaphragm 150 and the voice coil 130 collectively determine the resonant frequency of the speaker 100. Influencing factors of the resonant frequency include the geometry of the centering support 10 in addition to the properties of the material of the centering support 10.

It can be understood that the speaker 100 to which the centering piece 160 is applied is not limited to the above structure, and the centering piece 160 provided by the present invention can be used in any speaker having a centering piece.

Since the carbon nanotubes have excellent mechanical strength and small density, the specific strength of the carbon nanotube structure composed of carbon nanotubes is large, thereby improving the centering support composed of the carbon nanotube structure and the matrix. The specific strength, or the weight of the centering piece and the speaker using the centering piece, while maintaining or even increasing the specific strength of the centering piece and the speaker using the centering piece.

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 is only a preferred embodiment of the present invention, and cannot be limited by this. The scope of the patent application in this case. 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‧‧‧ Centering piece

101‧‧‧through hole

Claims (18)

a centering piece having a vibration pattern, and having a through hole at a center of the centering piece, wherein the centering piece includes at least one carbon nanotube structure and a base, The carbon nanotube structure includes a plurality of carbon nanotubes having a gap between the carbon nanotubes, the matrix being filled in a gap between the carbon nanotubes. The centering piece according to claim 1, wherein the carbon nanotube structure comprises a plurality of carbon nanotubes, and the base material is coated on a surface of the carbon nanotube. The centering piece according to claim 1, wherein the centering piece comprises a plurality of carbon nanotube structures, the carbon nanotube structure is layered, and the plurality of carbon nanotube structures are The base materials are attached to each other or spaced apart. The centering segment of claim 1, wherein the carbon nanotube structure comprises at least one carbon nanotube film, at least one nanocarbon line structure, or any combination thereof. The centering slab of claim 4, wherein the carbon nanotube structure comprises a plurality of laminated carbon nanotube membranes. The centering piece according to claim 5, wherein the carbon nanotube film comprises a plurality of carbon nanotubes connected end to end and arranged in a preferred orientation in one direction, and the vanadium force is passed between the carbon nanotubes Connected to each other. The centering piece according to claim 5, wherein the carbon nanotube film comprises a plurality of carbon nanotubes connected end to end and arranged in a preferred orientation along a plurality of directions, and the vanadium force is passed between the carbon nanotubes Connected to each other. The centering piece according to claim 5, wherein the carbon nanotube film comprises a plurality of carbon nanotubes, and the plurality of carbon nanotubes are entangled or isotropically aligned. The centering segment of claim 4, wherein the carbon nanotube structure comprises a plurality of nanometers a carbon line-like structure, wherein the plurality of carbon-carbon line-like structures are disposed in parallel, intersected, or interwoven in the base material. The centering segment of claim 4, wherein the nanocarbon line-like structure comprises at least one twisted nanocarbon line, at least one non-twisted nanocarbon line, or any combination thereof. The centering piece according to claim 10, wherein the nanocarbon line-like structure comprises a plurality of carbon nanotubes arranged in parallel to form a bundle structure or twisted by a plurality of nano carbon lines to form a strand structure. The centering segment of claim 4, wherein the nanocarbon line-like structure comprises at least one nanocarbon line disposed in parallel with at least one linear substrate to form a bundle structure. The centering segment of claim 4, wherein the nanocarbon line-like structure comprises at least one nanocarbon line and at least one linear matrix twisted to each other to form a stranded structure. The centering piece according to claim 4, wherein the carbon nanotube structure comprises at least one nanocarbon line-like structure disposed in parallel with at least one linear substrate, disposed at an intersection or interwoven with the substrate. Among them. The centering slab of claim 1, wherein the substrate comprises a polymer film, a paper, a metal layer or a metal sheet. The centering piece of claim 1, wherein the centering piece has a zigzag shape, a wavy shape or an involute shape. A centering piece comprising a base body, wherein the base body is a ring-shaped annular body having a cross-section, the base body has a through hole in the center, wherein the centering piece further comprises a nano carbon In the tube structure, the carbon nanotube structure comprises a plurality of carbon nanotubes having a gap between the carbon nanotubes, the matrix being filled in a gap between the carbon nanotubes. A speaker comprising: a bracket, a voice coil, a voice coil bobbin, a centring piece, a diaphragm and a magnetic circuit system, the magnetic field system having a magnetic field gap, the voice coil being disposed in the magnetic field gap The centering piece is sleeved on the voice coil skeleton, wherein the centering piece package The carbon nanotube structure includes at least one carbon nanotube structure and a matrix, and the carbon nanotube structure includes a plurality of carbon nanotubes having a gap between the carbon nanotubes, and the substrate is filled in a gap between the carbon nanotubes.