TWI513333B - Coil and loudspeaker using the same - Google Patents

Description

Voice coil and speaker using the voice coil

The present invention relates to a voice coil and a speaker using the same.

An electric speaker usually includes a voice coil, a voice coil bobbin, a magnetic circuit system, 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. During operation, the movement of the voice coil fixed on the voice coil bobbin in the magnetic field generated by the magnetic field system forces the diaphragm to vibrate and emit sound waves.

The voice coil is the drive unit of the speaker. The voice coil is in a magnetic field environment. When a current is applied to the voice coil, the voice coil will perform piston movement under the action of the magnetic field, thereby pushing and pulling the diaphragm to reciprocate back and forth, thereby pushing the surrounding air to move and emit sound waves. The voice coil is usually an enameled wire structure, that is, the wire is covered with an insulating material. The wires in the prior art are often made of a metal material such as copper. However, the metal is less flexible and easily oxidized, which affects the life of the voice coil, which in turn affects the normal operation of the entire speaker.

In view of this, it is indeed necessary to provide a voice coil with a good flexibility and a long life and a speaker using the voice coil.

A speaker includes a voice coil bobbin, a voice coil, a diaphragm, and a magnetic field system. The voice coil is disposed at an axial periphery of the voice coil bobbin. The diaphragm is coupled to the voice coil bobbin. The magnetic field system has a magnetic field gap in which the voice coil is disposed. The voice coil includes at least one wire knot wound around an outer surface of the voice coil bobbin The wire structure includes a wire and an insulating layer, and the insulating layer covers the outer surface of the wire. The wire includes a core wire and a nano carbon line structure, and the nano carbon line structure includes a plurality of carbon nanotubes.

a voice coil for arranging a periphery of a voice coil bobbin in a speaker, comprising at least one wire structure wound around an outer surface of the voice coil bobbin, the wire structure comprising a wire and an insulating layer, the insulating layer is coated on the An outer surface of the wire, wherein the wire comprises a core wire and a nanocarbon line-like structure, the nanocarbon line structure comprising a plurality of carbon nanotubes.

Compared with the prior art, the wire structure of the voice coil of the speaker provided by the present invention includes a nano carbon line structure, and the nano carbon line structure includes a plurality of carbon nanotubes, and the nano carbon line structure It has good conductivity and good flexibility and bending resistance. Therefore, the use of the nano carbon line structure can effectively improve the flexibility of the entire voice coil, making the voice coil less prone to breakage, thus making the voice coil and High speaker life.

140‧‧‧ voice coil skeleton

100‧‧‧Speakers

110‧‧‧ bracket

111‧‧‧ Cavity

112‧‧‧Bottom of the bracket

113‧‧‧ 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

132‧‧‧Wire

1322‧‧‧core

1324‧‧‧Nano carbon pipeline structure

134‧‧‧Insulation

136‧‧‧ voice coil leads

150‧‧‧Vibration film

160‧‧‧Centering piece

1 is a schematic exploded view of a speaker provided by an embodiment of the present invention.

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

FIG. 3 is a schematic structural view of a voice coil and a voice coil bobbin in the speaker of FIG. 1. FIG.

4 is a schematic cross-sectional view of a voice coil in the speaker of FIG. 1.

Fig. 5 is a schematic view showing the structure of a wire formed by spirally winding a nanocarbon line-like structure and a core wire.

Figure 6 is a surface structure of a core carbon wire-like structure spiral around the core wire Schematic diagram of the structure of the resulting wire.

Figure 7 is a scanning electron micrograph of a non-twisted nanocarbon line employed in a nanocarbon line-like structure in the voice coil of a loudspeaker.

Figure 8 is a scanning electron micrograph of a twisted nanocarbon line employed in a nanocarbon line-like structure in a voice coil of a loudspeaker.

Hereinafter, a speaker of an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to Figures 1 and 2, the present invention provides a speaker 100. 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 and the magnetic circuit system 120 are fixed to each other. The voice coil 130 is disposed on an axial outer surface of the voice coil bobbin 140 near one end of the magnetic circuit system 120 and is received in the magnetic circuit system 120. 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 can be a truncated cone structure having a cavity 111 and a bottom portion 112. The cavity 111 is used to accommodate 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 circuit system 120 includes a magnetically permeable lower plate 121, a magnetically permeable upper plate 122, a magnet 123, and a magnetic conductive core post 124. The opposite axial ends of the magnet 123 are respectively sandwiched by the concentric magnetic lower plate 121 and the magnetic conductive upper plate 122. 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, and the cylindrical space is a cylindrical structure. Space . 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 to accommodate 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 fixing method 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 bobbin 140 is a hollow cylindrical structure that is disposed concentrically with the magnetic core stud 124 and sleeved on the magnetic core stud 124 while being received in the magnetic field gap 125. An outer surface of the voice coil bobbin 140 is fixed to the voice coil 130, and an end thereof away from the magnetic circuit system 120 is fixedly coupled to a center position of the vibrating membrane 150. When the voice coil bobbin 140 vibrates with the voice coil 130, the vibrating membrane 150 is caused to vibrate, thereby moving the air around the vibrating membrane 150 to generate sound waves. The voice coil bobbin 140 is made of a material resistant to high temperature, high strength and low density. In the present embodiment, the voice coil bobbin 140 is a paper tube.

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 a large speaker, the diaphragm 150 may be a hollow cone structure; when the diaphragm 150 is applied to a micro speaker The diaphragm 150 may be a disk-like structure. The bottom end of the vibrating membrane 150 and the voice coil bobbin 140 can be connected by bonding, and the outer edge of the other end is connected to the bracket 110, that is, the end of the vibrating membrane 150 connected to the bracket 110 can move up and down. In order to achieve the effect of vibration and sound. In this embodiment, the diaphragm 150 is a hollow cone structure.

The centering piece 160 is a wave-shaped ring structure composed of a plurality of concentric ring groups to make. 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 the bracket 110 near the center hole. One end of 113. 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 120 touches and functions to fix the center of the diaphragm 150.

Referring to FIG. 3 together, the voice coil 130 is disposed at the periphery of the voice coil bobbin 140 and is located at one end of the voice coil bobbin 140 and is received in the magnetic field gap 125. The voice coil 130 is a drive unit of the speaker 100. The voice coil 130 is electrically connected to an external circuit through a voice coil lead 136 to allow an external circuit to input an audio signal to the voice coil 130. The voice coil 130 is a structure in which a wire structure (not shown) is wound around the outer surface of the voice coil bobbin 140. The voice coil 130 can be a single-layer multi-turn structure or a multi-layer multi-turn structure. The number of turns of the voice coil 130 is related to the power of the speaker 100. The more the number of turns of the voice coil 130, the greater the power of the speaker 100, the smaller the number of turns of the voice coil 130, and the smaller the power of the speaker 100. The larger the diameter of the voice coil 130 wire structure, the greater the current that the voice coil 130 can withstand. 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 occurs between the magnetic field generated by the magnetic field system 120 and the magnetic field gap 120. The interaction forces the voice coil 130 to produce piston motion along its axial direction. The voice coil 130 drives the voice coil bobbin 140 to perform piston movement. Since one end of the voice coil bobbin 140 is connected to the vibrating membrane 150, vibration of the vibrating membrane 150 is caused, and the vibrating membrane 150 pushes the surrounding air to cause the speaker 100 to emit sound.

Referring to FIG. 4, the wire structure of the voice coil 130 is composed of a wire 132 and an insulating layer 134 covering the outer surface of the wire 132, that is, the voice coil 130 is an enamel wire structure. Said The diameter of the voice coil 130 is substantially equal to the diameter of the voice coil bobbin 140. The diameter of the wire structure is substantially equal to the sum of the diameter of the conductive layer 132 and the thickness of the insulating layer 134. The wire 132 has a diameter of 0.1 mm to 50 mm. In this embodiment, the voice coil 130 has a diameter of 0.1 mm to 50 mm. The insulating layer 134 has a thickness of 10 micrometers to 0.1 millimeters. The insulating layer 134 is composed of an insulating varnish, which may include polyester, polyurethane, polyimine, polyamidimide, and the like. The insulating layer 134 can also be other insulating materials, including plastics, rubber, and the like.

The wire 132 includes a core wire 1322 and a nanocarbon line-like structure 1324 that is interconnected with the carbon nanotube structure. Both ends of the nanocarbon line-like structure 134 are connected to both ends of the core line 1322, respectively. The core wire 1322 and the carbon nanotube structure are disposed in parallel with each other or intertwined to form the wire 132. Referring to FIG. 5, the core wire 1322 and the nanocarbon line-like structure 1324 may be spirally wound with each other. Referring to FIG. 6, the nanocarbon line-like structure 1324 may also be an axis of the core wire 1322 wound around the surface of the core wire 1322. It can be understood that the core wire 1322 is also an axis of the nanocarbon line-like structure 1324 wound around the surface of the nanocarbon line-like structure 1324. When the length of the core wire 1322 is less than or equal to the length of the nanocarbon line-like structure 1324, the length of the voice coil 130 is equal to the length of the core wire 1322. When the length of the nanocarbon line-like structure 1324 is less than the length of the core line 1322, the length of the voice coil 130 is equal to the length of the nanocarbon line-like structure 1324.

The material of the core wire 1322 may be a conductive material or an insulating material. The conductive material includes a wire such as a copper wire, a silver wire, an aluminum wire or the like. Insulating materials include fibers, polymers, cotton or rubber. When the material of the core wire 1322 is a conductive material, the core wire 1322 functions as a conductive wire in the voice coil 130. When the core wire 1322 is broken, the nanocarbon line-like structure 1324 still has the function of conducting electricity and transmitting electrical signals, and can continue to work. Core When the line 1322 is an insulating material, the nanocarbon line-like structure 1324 functions as a conductive source for transmitting electrical signals.

The nanocarbon line-like structure 1324 includes a plurality of carbon nanotubes, and the plurality of carbon nanotubes are connected end to end. Since the plurality of carbon nanotubes are connected end to end, the nanocarbon line-like structure 1324 has good electrical conductivity. The length of the nanocarbon line-like structure 1324 is not limited, and the diameter is preferably 0.05 mm to 20 mm, and the length is not limited. The carbon nanotubes include one or more of a single-walled carbon nanotube, a double-walled carbon nanotube, and a multi-walled carbon nanotube. The single-walled carbon nanotube has a diameter of 0.5 nm to 50 nm, the double-walled carbon nanotube has a diameter of 1.0 nm to 50 nm, and the multi-walled carbon nanotube has a diameter of 1.5. Nano ~ 50 nm.

The nanocarbon line-like structure 1324 includes at least one nanocarbon line including a plurality of carbon nanotubes connected end to end. When the nanocarbon pipeline structure 1324 includes a plurality of nano carbon pipelines, the nanocarbon pipeline structure 1324 is a bundle structure in which a plurality of nano carbon pipelines are arranged in parallel or a plurality of nano carbon pipelines are spirally wound with each other. Stranded structure.

The nanocarbon line can be a non-twisted nanocarbon line or a twisted nanocarbon line. The non-twisted nano carbon line is obtained by treating a carbon nanotube film by an organic solvent. Referring to FIG. 7, the non-twisted nanocarbon pipeline includes a plurality of carbon nanotubes extending along the length of the nanocarbon pipeline and connected end to end. The plurality of carbon nanotubes are parallel to each other. Preferably, the non-twisted nanocarbon pipeline 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 comprises a plurality of mutually parallel and The carbon nanotubes are tightly combined by Van der Valli. 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. Referring to FIG. 8, the twisted nanocarbon pipeline includes a plurality of carbon nanotubes that are end-to-end and axially arranged around the nanocarbon pipeline. Preferably, the twisted nanocarbon pipeline 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 comprises a plurality of mutually parallel and The carbon nanotubes are tightly combined by Van der Valli. 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. The nano carbon pipeline and its preparation method can be found in Fan Shoushan et al., which was applied for on November 5, 1991. The announcement of the Republic of China on May 16, 1992 is No. I303239. Rope and its manufacturing method", applicant: Hong Fujin Precision Industry (Shenzhen) Co., Ltd., and Taiwan Patent Application No. 200724486, published on December 16, 1994, "Nano Carbon Tube Wire and Method of Making Same "Applicant: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. In order to save space, only the above is cited, but all the technical disclosures of the above application are also considered as part of the technical disclosure of the present application.

Further, the nanocarbon line can be treated with a volatile organic solvent. Under the action of the surface tension generated by the volatilization of volatile organic solvents, the adjacent carbon nanotubes in the treated nanocarbon pipeline are tightly bonded by van der Waals force, so that the diameter and specific surface area of the twisted nanocarbon pipeline Further reduced, thereby increasing its density and strength.

The wire of the voice coil 130 provided by the present invention comprises a composite structure formed by the nanocarbon line-like structure 1324 and the core wire 1322. When the core wire 1322 is a conductive material, the core wire 1322 functions as a conductor even if the core wire 1322 is broken due to poor flexibility. The nanocarbon line-like structure 1324 can continue to conduct electricity, thereby making the voice coil 130 longer. The life of the voice coil 130 is improved when the core wire 1322 is an insulating material, and the nano carbon line structure 1324 is electrically conductive, and the composite structure formed by the core wire 1322 and the nano carbon line structure 1324 further enhances the strength of the wire 132. The strength, because the nano carbon line structure 1324 has high flexibility, the use of the nano carbon line structure 1324 can effectively improve the strength and bending resistance of the entire voice coil 130, making the voice coil 130 less prone to occur. The breakage causes the speaker 100 to have a long life.

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.

140‧‧‧ voice coil skeleton

100‧‧‧Speakers

110‧‧‧ bracket

111‧‧‧ Cavity

112‧‧‧Bottom of the bracket

113‧‧‧ center hole

120‧‧‧ Magnetic circuit system

121‧‧‧Magnetic lower plate

122‧‧‧Magnetic upper plate

123‧‧‧ magnet

124‧‧‧magnetic core column

130‧‧‧ voice coil

150‧‧‧Vibration film

160‧‧‧Centering piece

Claims (20)

A speaker includes: a voice coil bobbin; a voice coil disposed at an axial periphery of the voice coil bobbin, the voice coil including at least one wire structure wound around a periphery of the voice coil bobbin, the wire The structure includes a wire and an insulating layer covering the outer surface of the wire; a vibrating film connected to the voice coil bobbin; and a magnetic circuit system having a magnetic field gap, the sound a ring is disposed in the magnetic field gap; the improvement is that the wire comprises at least one nano carbon line structure and at least one conductive core, the at least one carbon line and the at least one core are interconnected to form the wire, The nanocarbon pipeline structure consists of a plurality of carbon nanotubes connected end to end. The speaker of claim 1, wherein the plurality of carbon nanotubes are connected end to end by Van der Waals force. The speaker according to claim 1, wherein the nanocarbon line-like structure has a diameter of 0.05 mm to 50 mm. The speaker of claim 1, wherein the nanocarbon line-like structure comprises at least one nanocarbon line. The speaker of claim 4, wherein the nanocarbon line-like structure comprises a plurality of nanocarbon pipelines arranged in parallel to form a bundle structure. The speaker of claim 4, wherein the nanocarbon line-like structure comprises a plurality of nanocarbon lines that are twisted to each other to form a stranded structure. The speaker of claim 4, wherein the plurality of carbon nanotubes in the carbon nanotube line The tails are connected and the axial direction of the plurality of carbon nanotubes is substantially parallel to the axial direction of the nanocarbon line. The speaker according to claim 4, wherein a plurality of carbon nanotubes in the nanocarbon line are connected end to end and the axial direction of the plurality of carbon nanotubes extends along an axial spiral of the carbon nanotube. The speaker according to claim 4, wherein the nano carbon line has a diameter of 0.5 nm to 100 μm. The speaker according to claim 1, wherein the insulating layer has a thickness of 10 μm to 0.1 mm. The speaker according to claim 1, wherein the material of the insulating layer is polyester, polyurethane, polyimine or polyamidolimine. The speaker of claim 1, wherein the core wire is a conductive material or an insulating material. The speaker of claim 12, wherein the core wire comprises a copper wire, a silver wire or an aluminum wire. The speaker according to claim 1, wherein the at least one nanocarbon line-like structure and the at least one core are spirally wound with each other. The speaker according to claim 1, wherein the at least one core wire is spirally wound on a surface of the nanocarbon line-like structure with an inner carbon line structure as an axis. The speaker according to claim 1, wherein the at least one nanocarbon line-like structure is spirally wound on a surface of the core wire with a core line as an axis. The speaker according to claim 1, wherein the voice coil is a single-layer multi-turn structure or a multi-layer multi-turn structure composed of the wire wound around an outer surface of the voice coil bobbin. The speaker according to claim 1, wherein the nanocarbon line-like structure and both ends of the core wire are connected to each other to constitute the wire. The speaker according to claim 1, wherein the nanocarbon line-like structure and the core are parallel or intertwined with each other. a voice coil for arranging a periphery of a voice coil bobbin in a speaker, comprising at least one wire structure wound around an outer surface of the voice coil bobbin, the wire structure comprising a wire and an insulating layer, the insulating layer is coated on the An outer surface of the wire, the improvement being that the wire comprises at least one carbon nanotube The wire structure and the at least one core wire, the at least one nano carbon line and the at least one conductive core are interconnected to form the wire, and the nanocarbon line structure is composed of a plurality of carbon nanotubes connected end to end.