CN108574923B - Preparation method of silicon-carbon vibrating diaphragm, carbon vibrating diaphragm and acoustic unit provided with vibrating diaphragm - Google Patents
Preparation method of silicon-carbon vibrating diaphragm, carbon vibrating diaphragm and acoustic unit provided with vibrating diaphragm Download PDFInfo
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- CN108574923B CN108574923B CN201810402162.6A CN201810402162A CN108574923B CN 108574923 B CN108574923 B CN 108574923B CN 201810402162 A CN201810402162 A CN 201810402162A CN 108574923 B CN108574923 B CN 108574923B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/003—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor for diaphragms or their outer suspension
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2231/00—Details of apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor covered by H04R31/00, not provided for in its subgroups
- H04R2231/001—Moulding aspects of diaphragm or surround
Abstract
The invention relates to the technical field of electroacoustic products, in particular to a silicon-carbon vibrating diaphragm, a preparation method of the silicon-carbon vibrating diaphragm and an acoustic unit provided with the vibrating diaphragm, wherein the preparation method comprises the following steps: preparing a carbon vibrating diaphragm; providing a prepared silica gel vibrating diaphragm; tightly connecting the carbonaceous vibrating diaphragm and the silica gel vibrating diaphragm together in a secondary forming mode; through preparing the silicon-carbon vibrating diaphragm, the silicon-carbon vibrating diaphragm of preparation has the matter light, the sound field is wide, elasticity and rigidity are good, and high temperature resistant, it is fatigue-resistant, receive external environment's such as moisture advantage such as little, adopt a post forming's mode to make a novel silicon-carbon vibrating diaphragm with silica gel vibrating diaphragm and carbonaceous vibrating diaphragm, thereby can be convenient install on electronic speaker's acoustics unit, also can with electronic speaker's the direct integrated into one piece of acoustics unit, compare in traditional technical scheme or pure carbon vibrating diaphragm or pure silica gel vibrating diaphragm, have higher sensitivity and distinguish the degree, technology easy operation, the shaping is convenient, can realize extensive preparation.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of electroacoustic products, in particular to a preparation method of a silicon-carbon vibrating diaphragm, the silicon-carbon vibrating diaphragm and an acoustic unit with the vibrating diaphragm.
[ background of the invention ]
As an important component of a loudspeaker, a diaphragm is a sensitive element to changes in an electromagnetic field, which changes when an electrical signal passes through a coil, causing the diaphragm to deform under force. Because the electric signal changes very fast, leads to the high-speed vibration of vibrating diaphragm, and the vibration transmission of rethread vibrating diaphragm is for the air to the sound wave has been produced. In this process, the acoustic properties of the diaphragm determine the overall performance of the earphone or speaker. The kind of vibrating diaphragm has a lot of, has paper vibrating diaphragm, wooden vibrating diaphragm, plastics vibrating diaphragm, metal vibrating diaphragm, biological vibrating diaphragm etc.. Carbon is considered to be a material of the acoustic diaphragm having excellent performance. The material is proved to have some excellent characteristics. The acoustic response curve of the diaphragm is obviously superior to the diaphragm technology of simple coatings such as aluminum diaphragms and titanium diaphragms, and is also superior to the multilayer diaphragm technology.
In the prior art, the purpose of improving the rigidity and high-frequency stability of the vibrating diaphragm is realized by a method of bonding a layer of metal aluminum film on the plastic vibrating diaphragm. However, since the bottom layer material is still plastic film and the weight of the film is not reduced, the space for improving the sound quality is limited, and especially in a wide frequency band and a high-pitch range, the crack distortion of the bonded amorphous carbon layer is easy to be large, and the original sound is difficult to be really restored.
The inventor discovers that in the process of implementing the invention: the existing aluminum diaphragm has the disadvantages of large weight, small inertia and insufficient rigidity, and the presented audio performance still needs to be improved and enhanced.
[ summary of the invention ]
An object of an embodiment of the present invention is to provide a method for preparing a silicon-carbon diaphragm, and an acoustic unit having the diaphragm, and aims to solve the technical problem that the existing aluminum diaphragm has poor audio performance.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a method for preparing a silicon-carbon diaphragm, where the method includes: preparing a carbon vibrating diaphragm; providing a prepared silica gel vibrating diaphragm; and tightly connecting the carbonaceous vibrating diaphragm and the silica gel vibrating diaphragm together in a secondary forming mode.
Preferably, the preparing of the carbonaceous diaphragm specifically includes: providing a precursor resin and a film;
uniformly coating the precursor resin on a film containing a release agent; covering a layer of film containing a release agent on the coated precursor resin; shaping at a preset temperature and a preset pressure to obtain a precursor resin film; mechanically cutting the precursor resin film into a film sheet with a predetermined shape; and (3) under the protection of inert gas, heating the diaphragm to over 1000 ℃ in a segmented manner under a preset pressure, and carbonizing to obtain the porous uniform and compact carbonaceous diaphragm.
Preferably, the precursor resin is one or a combination of more than two of phenolic resin, polyurethane resin, furan resin, silicon resin, unsaturated polyester, alkaline phenolic resin and epoxy resin.
Preferably, the precursor resin is a silicon-containing resin composite, wherein the content of silicon is 0.01% -100%.
Preferably, the precursor resin film thickness is 0.01-2 mm.
Preferably, the inert gas is one of nitrogen, argon, helium and carbon dioxide.
Preferably, the predetermined temperature is 70-250 ℃.
Preferably, the secondary forming mode adopts a laser mode, a plasma mode or an ultrasonic mode.
In a second aspect, an embodiment of the present invention provides a silicon-carbon diaphragm, which is manufactured by the manufacturing method of any one of the preceding claims.
In a third aspect, embodiments of the present invention provide an acoustic unit including a silicon carbon diaphragm as described above.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: make a novel silicon-carbon vibrating diaphragm through adopting post forming's mode with silica gel vibrating diaphragm and carbonaceous vibrating diaphragm, thereby can be convenient install on electronic loudspeaker's acoustics unit, also can with electronic loudspeaker's the direct integrated into one piece of acoustics unit, compare in traditional technical scheme or pure carbon vibrating diaphragm or pure silica gel vibrating diaphragm have higher sensitivity and distinguish the degree, easy process operation, the shaping is convenient, can realize extensive preparation, and simultaneously, the novel silicon-carbon vibrating diaphragm of preparation itself has matter light, the sound field is wide, elasticity and rigidity are better, and high temperature resistant, it is tired, receive external environment's such as moisture advantage such as influence is little.
[ description of the drawings ]
Fig. 1 is a schematic structural diagram of a silicon-carbon diaphragm according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an acoustic unit of a loudspeaker according to an embodiment of the present invention;
FIG. 3 is a scanning electron microscope image of a silicon carbon diaphragm pore structure provided by an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for manufacturing a silicon-carbon diaphragm according to an embodiment of the present invention.
In the figure: 100. a silicon-carbon diaphragm; 10. a pore; 200. an acoustic unit; 20. an acoustic unit body.
[ detailed description ] embodiments
In order to make the objects, aspects and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic structural diagram of a silicon-carbon diaphragm according to an embodiment of the present invention; as shown in fig. 1, a plurality of pores 10 are formed in the silicon-carbon diaphragm 100, the pores 10 are uniformly distributed in the entire silicon-carbon diaphragm 100 material, and the porosity of the silicon-carbon diaphragm 100 material is greater than 70%; the pore diameter of the pores 10 is 1 to 100. mu.m, and preferably the pore diameter of the pores 10 is 1 to 10 μm.
Fig. 2 is a schematic structural diagram of an acoustic unit of a speaker according to an embodiment of the present invention; as shown in fig. 2, the acoustic unit 200 includes the silicon carbon diaphragm 100 and the acoustic unit body 20, and the silicon carbon diaphragm 100 is directly connected to the acoustic unit body 20, which has the advantages of high sensitivity and high recognition.
The silicon-carbon vibrating diaphragm comprises an upper layer and a lower layer, the upper layer is a carbon vibrating diaphragm, the lower layer is a silica gel vibrating diaphragm, the carbon vibrating diaphragm and the silica gel vibrating diaphragm both have good high-temperature resistance, and the upper layer carbon vibrating diaphragm and the lower layer silica gel vibrating diaphragm are compounded to obtain the novel composite silicon-carbon vibrating diaphragm material which has high sensitivity and high identification degree, namely the silicon-carbon vibrating diaphragm.
FIG. 3 is a scanning electron microscope image of the pore structure of the silicon carbon diaphragm.
The silicon-carbon diaphragm provided by the embodiment can also be prepared in a large scale by using a simpler process, and has lower production and use costs. Fig. 4 is a schematic flow chart of a method for manufacturing a silicon-carbon diaphragm according to an embodiment of the present invention.
As shown in fig. 4, the preparation method of the silicon-carbon diaphragm includes the following steps:
s1: preparing a carbon vibrating diaphragm;
the preparation of the carbonaceous diaphragm specifically comprises the following steps: a precursor resin and a thin film are provided.
The precursor resin has preset concentration and viscosity, and is one or a composition of more than two of phenolic resin, polyurethane resin, furan resin, silicon resin, unsaturated polyester, alkaline phenolic resin and epoxy resin.
The precursor resin is a silicon-containing resin complex, the resin complex is one of silicon resin, silica sol, silica gel, silane and silica micropowder, wherein the silicon content is 0.01-100%, and in the embodiment, the silicon content is preferably 10-50%.
The film is one of polyethylene, polycarbonate, polyethylene terephthalate, polystyrene, polyether ether ketone, polyimide, liquid crystal polymer and polyphenylene sulfide, and the film in the embodiment is coated with a release agent.
And uniformly coating the precursor resin on a film containing a release agent.
The precursor resin is uniformly coated on the film containing the release agent through continuous film forming equipment. The continuous film forming equipment adopts casting roller film equipment.
And (3) passing the film carrying the precursor resin through a channel with a preset temperature, controlling the speed and the temperature of the film passing through the channel, and covering the film containing the release agent on the coated precursor resin after the film is treated at the preset temperature.
It is understood that the speed and temperature of the thin film passing through the channel are controlled, wherein the channel speed is 0.01-100 m/min; in the embodiment, the preferable channel speed is 1-60 m/min; the temperature of the channel in this embodiment is 50-180 deg.C, and the preferred temperature of the channel in this embodiment is 60-120 deg.C.
The channel is a metal box or a metal box.
And shaping at a preset temperature and pressure to obtain a precursor resin film.
It is understood that the predetermined temperature is 70-250 deg.C, and the predetermined temperature is preferably 120-200 deg.C in this embodiment; the predetermined pressure is 0.01MPa or more, and in the present embodiment, the predetermined pressure is preferably 14 to 16 MPa.
In this embodiment, the thickness of the precursor resin film is 0.01-2mm, and preferably 0.03-1 mm.
And cutting the precursor resin film into a film sheet with a preset shape by a machine.
The diaphragm may be circular, square or oval, and it is understood that the shape of the diaphragm can be arbitrarily set according to the application environment.
And (3) heating the diaphragm to above 1000 ℃ in a segmented manner under a preset pressure in an inert gas protection environment, and carbonizing to obtain the porous uniform and compact carbonaceous diaphragm material.
The inert gas is one of nitrogen, argon, helium and carbon dioxide; the predetermined pressure is understood to be a pressure applied to the precursor resin film during the carbon formation, and in the present embodiment, the predetermined pressure is 0.1MPa or more, and preferably the predetermined pressure is 0.4 to 1.5 MPa.
The temperature is raised to above 1000 ℃ in a segmented manner, which can be understood as the temperature rise rate and the carbonization temperature in the carbon forming process, wherein the temperature rise rate is 0.01-20 ℃/min, and the preferable temperature rise rate is 0.1-10 ℃/min; wherein the carbonization temperature is 500-1400 ℃, and the carbonization temperature is preferably 700-1200 ℃ in the embodiment.
In this embodiment, the carbonaceous diaphragm is a structural porous material of mixed crystalline carbon containing silicon.
S2: and providing the prepared silica gel diaphragm.
The silica gel vibrating diaphragm specifically comprises a formed silica gel film, and the silica gel film is continuously introduced into a die cavity of a molding press so as to keep the silica gel film flat in the die cavity;
closing the mold and controlling the temperature of the mold;
adjusting the mould pressing pressure, and maintaining the pressure for a period of time;
and (4) molding and taking out to prepare the silica gel vibrating diaphragm.
The temperature range of the mold temperature is 70-200 ℃, and the temperature of the mold temperature is preferably 150-180 ℃; the molding pressure is more than 0.01MPa, and preferably the molding pressure is 20-21 MPa; the dwell time is less than 20 minutes, and in the present example, the dwell time is preferably 1 to 2 minutes.
S3: and tightly connecting the silicon carbon film and the silicon vibration film together in a secondary forming mode.
The secondary forming mode is a laser, plasma or ultrasonic method and the like.
On one hand, the silicon-carbon diaphragm provided by the embodiment of the invention is used for an acoustic unit of an electronic loudspeaker, and has the advantages of light weight, good elasticity, large rigidity, difficult deformation, good high temperature resistance and high-frequency stability; on the other hand, adopt the mode of post forming to make a novel silicon carbon vibrating diaphragm with silica gel vibrating diaphragm and carbonaceous vibrating diaphragm to can be convenient install on electronic loudspeaker's acoustics unit, also can with electronic loudspeaker's the direct integrated into one piece of acoustics unit, compare in traditional technical scheme or pure carbon vibrating diaphragm, have higher sensitivity and distinguish degree, technology easy operation, the shaping is convenient, can realize extensive preparation.
The following describes in detail the preparation process and performance of the silicon-carbon diaphragm provided by the embodiment of the present invention with reference to a plurality of specific embodiments.
Example 1:
silane and polyurethane resin are uniformly mixed to obtain precursor resin, and particularly, the silicon content is controlled to be 14%. The polyurethane precursor resin is uniformly coated on a polyethylene terephthalate film containing a release agent by a device of a series of casting roller films, and the thickness of the polyurethane precursor resin on the film is controlled to be 0.05 mm. Then, the control film carrying the urethane precursor resin was passed through a hot air-containing metal box, specifically, the hot air temperature was controlled at 75 ℃ and the film advancing speed was 5 m/min. After being treated at a predetermined temperature, the coated precursor resin is covered with a polyethylene terephthalate film containing a release agent. Shaping at 150 deg.C under 21MPa to obtain precursor resin film. The precursor resin film is mechanically cut into a film sheet of a predetermined shape.
Loading the membrane cut into the preset shape to 0.6MPa in the protection of helium atmosphere, heating to 1000 ℃ at the speed of 3 ℃/min for carbonization, and carbonizing to obtain the silicon-containing mixed crystalline carbon structural porous material with uniform and compact pores, wherein the pore diameter is 4 mu m, and the porosity is 78%.
The embodiment provides a preparation method of a silica gel diaphragm, which includes: providing a molded silicone membrane;
introducing the silicone membrane into a mold cavity of a mold press in a continuous mode, and keeping the silicone membrane flat in the mold cavity;
and (3) closing the die, controlling the die temperature at 155 ℃, adjusting the die pressing pressure to 20MPa, maintaining the pressure for 2min, forming and taking out to prepare the silica gel diaphragm.
The silica gel vibrating diaphragm and the carbon vibrating diaphragm prepared by the method are firmly bonded together in an ultrasonic secondary forming mode, so that the novel silica carbon vibrating diaphragm with high sensitivity, high identification degree, wide sound field, elasticity, light weight, rigidity and high use temperature is prepared.
Example 2
Uniformly mixing the silica gel and the phenolic resin according to a preset proportion to obtain precursor resin, and particularly, controlling the content of silicon to be 11%. The phenolic resin is uniformly coated on the polyethylene terephthalate film containing the release agent by an apparatus containing a series of casting roller films, and the thickness of the polyurethane precursor resin on the film is controlled to be 0.08 mm. Then, the control film carrying the phenolic resin precursor resin was passed through a hot air-containing metal box, specifically, the hot air temperature was controlled at 90 ℃ and the film advancing speed was 7 m/min. After being treated at a predetermined temperature, the coated precursor resin is covered with a polyethylene terephthalate film containing a release agent. Shaping at 157 deg.C under 15.5MPa to obtain precursor resin film. The precursor resin film is mechanically cut into a film sheet of a predetermined shape.
Loading the membrane cut into the preset shape to 0.7MPa in the protection of helium atmosphere, heating to 1100 ℃ at the speed of 2 ℃/min for carbonization, and carbonizing to obtain the silicon-containing mixed crystalline carbon structural porous material with uniform and compact pores, wherein the pore diameter is 3 mu m, and the porosity is 76%.
The preparation method of the silica gel diaphragm comprises the following steps: providing a molded silicone membrane;
introducing the silicone membrane into a mold cavity of a mold press in a continuous mode, and keeping the silicone membrane flat in the mold cavity;
and (3) closing the die, controlling the die temperature to 160 ℃, adjusting the die pressing pressure to 20MPa, maintaining the pressure for 1min, forming and taking out to prepare the silica gel diaphragm.
The silica gel vibrating diaphragm and the carbon vibrating diaphragm prepared by the method are firmly bonded together in an ultrasonic secondary forming mode, so that the novel silica carbon vibrating diaphragm with high sensitivity, high identification degree, wide sound field, elasticity, light weight, rigidity and high use temperature is prepared.
Example 3
Uniformly mixing the silicon micropowder and furan resin according to a predetermined proportion to obtain precursor resin, and particularly, controlling the silicon content to be 21%. The furan resin precursor resin is uniformly coated on a polystyrene film containing a release agent by passing the resin through an apparatus containing a series of casting roll films, and the thickness of the furan resin precursor resin on the film is controlled to be 0.1 mm. Then, the control film carrying the furan resin precursor resin was passed through a hot air-containing metal box, specifically, the hot air temperature was controlled to 86 ℃ and the film advancing speed was 10 m/min. After being treated at a predetermined temperature, the coated precursor resin is covered with a polystyrene film containing a release agent. Shaping at 150 deg.C under 15MPa to obtain precursor resin film. The precursor resin film is mechanically cut into a film sheet of a predetermined shape.
Loading the membrane cut into the preset shape to 0.6MPa in the protection of helium atmosphere, heating to 500 ℃ at the speed of 5 ℃/min for carbonization, and carbonizing to obtain the silicon-containing mixed crystalline carbon structural porous material with uniform and compact pores, wherein the pore diameter is 2 mu m, and the porosity is 83%.
The preparation method of the silica gel diaphragm comprises the following steps: providing a molded silicone membrane;
introducing the silicone membrane into a mold cavity of a mold press in a continuous mode, and keeping the silicone membrane flat in the mold cavity;
and (3) closing the die, controlling the die temperature to 160 ℃, adjusting the die pressing pressure to 20MPa, maintaining the pressure for 2min, forming and taking out to prepare the silica gel diaphragm.
The silica gel vibrating diaphragm and the carbon vibrating diaphragm prepared by the method are firmly bonded together in an ultrasonic secondary forming mode, so that the novel silica carbon vibrating diaphragm with high sensitivity, high identification degree, wide sound field, elasticity, light weight, rigidity and high use temperature is prepared.
Example 4
Uniformly mixing silicon resin and epoxy resin according to a predetermined proportion to obtain precursor resin, and particularly, controlling the silicon content to be 30%. The silicon-epoxy precursor resin was uniformly coated on the polyimide film containing the release agent by an apparatus containing a series of casting roll films, with the thickness of the epoxy precursor resin on the film controlled to 0.07 mm. Then, the control film carrying the epoxy precursor resin was passed through a hot air-containing metal box, specifically, the hot air temperature was controlled at 77 ℃ and the film advancing speed was 6 m/min. After a predetermined temperature treatment, a polyimide film containing a release agent is applied on the coated precursor resin. And (3) shaping at 170 ℃ under the pressure of 16MPa to obtain the epoxy resin precursor resin film. The epoxy resin precursor resin film is mechanically cut into a film sheet of a predetermined shape.
Loading the membrane cut into the preset shape to 0.5MPa in the protection of nitrogen atmosphere, heating to 1000 ℃ at the speed of 1 ℃/min for carbonization, and carbonizing to obtain the silicon-containing mixed crystal carbon structure porous structure material with uniform and compact pores, wherein the pore diameter is 4 mu m, and the porosity is 75%.
The preparation method of the silica gel diaphragm comprises the following steps: providing a molded silicone membrane;
introducing the silicone membrane into a mold cavity of a mold press in a continuous mode, and keeping the silicone membrane flat in the mold cavity;
and (3) closing the die, controlling the die temperature at 155 ℃, adjusting the die pressing pressure to 21MPa, maintaining the pressure for 2min, forming and taking out to prepare the silica gel diaphragm.
The silica gel vibrating diaphragm and the carbon vibrating diaphragm prepared by the method are firmly bonded together in an ultrasonic secondary forming mode, so that the novel silica carbon vibrating diaphragm which has high sensitivity and identification degree, wide sound field, good elasticity and rigidity, light weight and high use temperature is prepared.
Comparative example 1
The preparation method comprises the steps of preparing a carbonaceous diaphragm material, uniformly mixing silicon micropowder with furan resin to obtain precursor resin, and particularly, controlling the silicon content to be 14%. The furan resin precursor resin is uniformly coated on a polystyrene film containing a release agent by passing the resin through an apparatus containing a series of casting roll films, and the thickness of the furan resin precursor resin on the film is controlled to be 0.1 mm. Then, the control film carrying the furan resin precursor resin was passed through a hot air-containing metal box, specifically, the hot air temperature was controlled to 86 ℃ and the film advancing speed was 10 m/min. After being treated at a predetermined temperature, the coated precursor resin is covered with a polystyrene film containing a release agent. Shaping at 150 deg.C under 15MPa to obtain precursor resin film. The precursor resin film is mechanically cut into a film sheet of a predetermined shape.
Loading the membrane cut into the preset shape to 0.6MPa in the protection of helium atmosphere, heating to 1000 ℃ at the speed of 5 ℃/min for carbonization, and carbonizing to obtain the silicon-containing mixed crystalline carbon structural porous material with uniform and compact pores, wherein the pore diameter is 2 mu m, and the porosity is 83%.
Comparative example 2
The embodiment provides a preparation method of a silica gel diaphragm, which includes: providing a molded silicone membrane;
introducing the silicone membrane into a mold cavity of a mold press in a continuous mode, and keeping the silicone membrane flat in the mold cavity;
and (3) closing the die, controlling the die temperature at 155 ℃, adjusting the die pressing pressure to 20MPa, maintaining the pressure for 2min, forming and taking out to prepare the silica gel diaphragm.
According to the technical scheme, the carbon-based vibrating diaphragm is provided in the comparative example 1, the bottom layer of the carbon-based vibrating diaphragm still adopts the polyethylene terephthalate film as the bottom material, the mass is not reduced, the inertia is high, and the vibrating diaphragm is applied to an acoustic unit, so that the carbon layer is easy to crack and distort, and sound signals cannot be reasonably restored/played back; while comparative example 2 only provides a silica gel diaphragm, the elasticity and the rigidity of this silica gel diaphragm are relatively poor, and its vibration dynamics is not good in this diaphragm application in the acoustic unit, and its audio frequency performance is unbalanced too.
In the embodiment of the invention, the silica gel vibrating diaphragm and the carbon vibrating diaphragm are manufactured into the novel silicon-carbon vibrating diaphragm in a secondary forming mode, so that the novel silicon-carbon vibrating diaphragm can be conveniently installed on an acoustic unit of an electronic loudspeaker and can also be directly and integrally formed with the acoustic unit of the electronic loudspeaker.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A preparation method of a silicon-carbon diaphragm is characterized by comprising the following steps:
providing a precursor resin and a film;
uniformly coating the precursor resin on a film containing a release agent;
covering a layer of film containing a release agent on the coated precursor resin;
shaping at a preset temperature and a preset pressure to obtain a precursor resin film;
mechanically cutting the precursor resin film into a film sheet with a predetermined shape;
under the protection of inert gas, the membrane is heated to over 1000 ℃ in sections under a preset pressure and carbonized to obtain a porous uniform and compact carbonaceous diaphragm;
providing a prepared silica gel vibrating diaphragm;
and tightly connecting the carbonaceous vibrating diaphragm and the silica gel vibrating diaphragm together in a secondary forming mode.
2. The method according to claim 1, wherein the precursor resin is one or a combination of two or more of a phenol resin, a polyurethane resin, a furan resin, a silicone resin, an unsaturated polyester, an alkaline phenol resin, and an epoxy resin.
3. The method according to claim 1, wherein the precursor resin is a silicon-containing resin composite in which the silicon content is 0.01% to 100%.
4. The production method according to claim 1, wherein the precursor resin film has a thickness of 0.01 to 2 mm.
5. The method of claim 1, wherein the inert gas is one of nitrogen, argon, helium, and carbon dioxide.
6. The method of claim 1, wherein the predetermined temperature is 70-250 ℃.
7. The method of claim 1, wherein the secondary molding is performed by laser, plasma, or ultrasonic.
8. A silicon-carbon diaphragm, characterized in that the silicon-carbon diaphragm is manufactured by the manufacturing method of any one of claims 1 to 7.
9. An acoustic unit, comprising: the silicon carbon diaphragm of claim 8.
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| CN110049425A (en) * | 2019-03-13 | 2019-07-23 | 东莞涌韵音膜有限公司 | Moving-coil speaker unit formation technique with miniature vibrating diaphragm |
| CN114105667B (en) * | 2020-08-28 | 2023-04-11 | 常州驰科光电科技有限公司 | Ball top material and preparation method thereof |
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| US5072806A (en) * | 1988-11-25 | 1991-12-17 | Mitsubishi Pencil Co., Ltd. | Diaphragm for acoustic equipment |
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