A method for manufacturing a loudspeaker diaphragm, the loudspeaker diaphragm, and the loudspeaker.

Abstract

This application discloses a method for manufacturing a loudspeaker diaphragm, the loudspeaker diaphragm itself, and a loudspeaker. The manufacturing method includes: molding a polymer to form a folded diaphragm substrate; placing the folded diaphragm substrate in a deposition chamber for cathodic arc deposition and thermal evaporation deposition to obtain a vapor-deposited diaphragm; selecting high-modulus carbon fiber prepreg and wet-winding it at a preset angle on a first mold to obtain a carbon fiber voice coil skeleton; bonding the vapor-deposited diaphragm to the carbon fiber voice coil skeleton with high-rigidity adhesive to obtain a diaphragm assembly; performing a frequency sweep test on the diaphragm assembly; adjusting the vibration characteristics of the diaphragm assembly based on the test results until the preset performance requirements are met to obtain a loudspeaker diaphragm assembly. This application significantly improves the performance and stability of the diaphragm assembly through a multi-step synergistic process, overcoming the shortcomings of existing technologies such as insufficient high-frequency vibration stability of the diaphragm, poor coating uniformity, and complex processes.

Description

Technical Field

[0001] This application relates to the field of loudspeaker technology, and in particular to a method for manufacturing a loudspeaker diaphragm, ... and a loudspeaker. Background Technology

[0002] The loudspeaker diaphragm is a component in a loudspeaker system that determines sound quality; its manufacturing method directly affects sound clarity, frequency response, and dynamic range. In existing technologies, loudspeaker diaphragms are typically manufactured using polymers, metals, or composite materials. The diaphragm substrate is formed through processes such as molding, injection molding, or hot pressing, followed by coating treatment or bonding to the voice coil frame to complete the diaphragm assembly. These methods are effective in achieving basic sound quality requirements, such as providing necessary vibration response and structural stability.

[0003] However, existing technologies generally suffer from a core technical problem in diaphragm manufacturing: insufficient stability of the diaphragm under high-frequency vibration. When the diaphragm is operating at high frequencies or high power output, it is prone to nonlinear vibration or local resonance, leading to sound quality distortion, especially in the high-frequency range, where it is difficult to achieve clear and stable sound output.

[0004] To improve the performance of diaphragms under high-frequency vibrations, existing technologies enhance their vibration resistance by introducing high-rigidity materials or optimizing surface treatment processes. For example, some technologies apply metal or ceramic coatings to a polymer matrix to enhance the diaphragm's rigidity and durability; others use carbon fiber composites to fabricate the diaphragm or voice coil frame to increase the overall structural modulus. However, while metal coatings can improve rigidity, the uniformity of the coating process is difficult to control, easily leading to uneven stress distribution on the diaphragm surface and subsequently causing localized deformation during high-frequency vibrations. The wet molding or bonding process for carbon fiber materials is complex and requires high equipment precision. If not properly controlled, micro-defects may appear at the junction of the diaphragm and voice coil frame, further exacerbating high-frequency vibration instability. Furthermore, existing coating technologies may experience peeling or fatigue damage during long-term use, reducing the diaphragm's reliability and lifespan. Summary of the Invention

[0005] The purpose of this application is to provide a method for manufacturing a loudspeaker diaphragm, thereby solving the technical problem of insufficient stability of the diaphragm under high-frequency vibration in the prior art.

[0006] To achieve this objective, the present application adopts the following technical solution:

[0007] A method for manufacturing a loudspeaker diaphragm, comprising:

[0008] A polymer is molded to form a folded structure diaphragm substrate, and the folded structure diaphragm substrate is placed in a deposition chamber for cathodic arc deposition to obtain a diamond-coated diaphragm.

[0009] In a vacuum environment, the diamond-coated diaphragm is placed in a thermal evaporation chamber, and the diamond-coated diaphragm is subjected to thermal evaporation deposition treatment to obtain a vapor-deposited diaphragm.

[0010] High-modulus carbon fiber prepreg is selected and wet-wound at a preset angle on the first mold to obtain a carbon fiber voice coil skeleton.

[0011] The vapor-deposited diaphragm and the carbon fiber voice coil skeleton are bonded together with high-rigidity adhesive to obtain a diaphragm assembly.

[0012] The diaphragm assembly is subjected to a frequency sweep test, and the vibration characteristics of the diaphragm assembly are adjusted according to the test results until the preset performance requirements are met, thus obtaining the speaker diaphragm assembly.

[0013] Furthermore, the polymer is any one or a mixture of polyimide, polyetheretherketone, polyethylene terephthalate, and polycarbonate.

[0014] Furthermore, the step of molding the polymer to form a folded-edge diaphragm substrate includes:

[0015] Under the conditions of a second mold temperature of 250~300°C and a pressure of 10~15MPa, the polymer is molded to obtain an initial folded matrix. The second mold adopts an asymmetric wavy design with a wave amplitude of 0.2~0.5mm and a wave pitch of 1.0~1.5mm.

[0016] The initial folded substrate is placed in an ultrasonic cleaning device for cleaning, using deionized water as the cleaning medium, with the ultrasonic frequency set to 40~60kHz and the cleaning time to 5~10 minutes, to obtain the initial diaphragm substrate.

[0017] The initial diaphragm substrate is subjected to vacuum drying to obtain a dried diaphragm substrate;

[0018] The folded edge structure of the dried diaphragm substrate is modified by laser to obtain a folded edge structure diaphragm substrate, wherein the laser wavelength is 532nm and the pulse width is 10~20ns.

[0019] Further, the step of placing the folded structure diaphragm substrate in a deposition cavity for cathodic arc deposition to obtain a diamond-coated diaphragm includes:

[0020] The folded structure diaphragm substrate is placed in the deposition chamber, the deposition chamber is evacuated to 10-5 Pa, hydrogen is introduced as a protective gas, and the deposition chamber is preheated to 80-100°C.

[0021] Using a high-purity graphite target as the cathode, a cathode arc discharge is initiated to perform low-speed pre-deposition on the surface of the folded structure diaphragm substrate. The DC voltage of the cathode arc discharge is 400V, the arc current is 40A, the deposition rate is 0.2~0.3nm / s, and the deposition time is 5~10 minutes.

[0022] The surface of the folded structure diaphragm substrate is subjected to a main deposition process. The arc current is adjusted to 50~80A and a -100V pulse bias voltage is applied. The deposition rate is increased to 0.5~1nm / s and deposition is continued for 20~30 minutes. At the same time, hydrogen gas is introduced into the deposition cavity to obtain a diamond-coated diaphragm.

[0023] Further, the step of placing the diamond-coated diaphragm in a vacuum environment within a thermal evaporation chamber and performing thermal evaporation deposition on the diamond-coated diaphragm to obtain a vapor-deposited diaphragm includes:

[0024] The diamond-coated diaphragm is placed in a thermal evaporation chamber, the vacuum level in the thermal evaporation chamber is adjusted to 10-7 Pa, and argon gas is introduced as a protective gas. At the same time, the temperature in the thermal evaporation chamber is raised to 200-220°C and kept constant.

[0025] Using a platinum target as the evaporation source, the platinum target is heated to 1800°C by an electron beam heating device, and the deposition rate is controlled at 0.2 nm / s. The surface of the diamond-coated diaphragm is subjected to thermal evaporation deposition treatment for 15 to 20 minutes to obtain a primary platinum-coated diaphragm.

[0026] Using a titanium target as an auxiliary evaporation source, the titanium target is heated to 1600°C by an electron beam heating device, and the deposition rate is controlled at 0.1 nm / s. A secondary thermal evaporation deposition treatment is performed on the surface of the primary platinum-plated diaphragm for 10 minutes to obtain the evaporated diaphragm.

[0027] Furthermore, the step of selecting high-modulus carbon fiber prepreg and performing wet winding molding at a preset angle on a first mold to obtain a carbon fiber voice coil skeleton includes:

[0028] The high-modulus carbon fiber prepreg is wet-wound to the first mold at a preset angle, wherein the preset angle is 40~50° and the number of winding layers is 3~6 layers, to obtain a primary wound body;

[0029] The primary winding body and the first mold are placed in a high-temperature curing oven for curing treatment. After being kept at a temperature of 120~125°C for 120~150 minutes, the temperature is raised to 180~190°C and kept for 200~230 minutes to obtain a cured carbon fiber skeleton.

[0030] The cured carbon fiber skeleton is placed in a deposition chamber, and a nanoscale silicon carbide coating is deposited on the surface of the cured carbon fiber skeleton. The target power is 200~300W, and the deposition time is 10~15 minutes to obtain the carbon fiber voice coil skeleton.

[0031] Further, the step of bonding the vapor-deposited diaphragm to the carbon fiber voice coil skeleton with high-rigidity adhesive to obtain the diaphragm assembly includes:

[0032] The vapor-deposited diaphragm and carbon fiber voice coil skeleton are placed in an ultraviolet ozone cleaning device to clean the surfaces of the vapor-deposited diaphragm and carbon fiber voice coil skeleton.

[0033] Epoxy resin and curing agent are mixed and stirred at a mass ratio of 10~9:1. Silica particles are added during the mixing process to obtain a high-rigidity adhesive.

[0034] The high-rigidity adhesive is applied at a dispensing amount of 0.015~0.025g to the bonding area of ​​the cleaned vapor-deposited diaphragm and carbon fiber voice coil skeleton, and then aligned and bonded to obtain a preliminary bonded assembly.

[0035] The preliminary bonding assembly is placed in a constant temperature curing oven and cured at a low temperature of 25~30°C for 1.5~2.5 hours to obtain the diaphragm assembly.

[0036] Further, the step of performing a frequency sweep test on the diaphragm assembly and adjusting the vibration characteristics of the diaphragm assembly based on the test results until the preset performance requirements are met, thereby obtaining the speaker diaphragm assembly, includes:

[0037] A sinusoidal excitation signal is applied to the diaphragm assembly within a preset frequency range, and the amplitude, phase, and frequency response characteristics of the diaphragm assembly are measured to obtain preliminary vibration characteristic data.

[0038] Determine whether the preliminary vibration characteristic data meets the preset performance requirements;

[0039] If not, based on the difference between the preliminary vibration characteristic data and the preset performance requirements, a polymer damping material is coated on the edge region of the diaphragm assembly to adjust the boundary vibration characteristics of the diaphragm assembly until the preliminary vibration characteristic data meets the preset performance requirements, thus obtaining the loudspeaker diaphragm assembly.

[0040] This application also discloses a loudspeaker diaphragm, which is manufactured using the loudspeaker diaphragm manufacturing method described in any of the above claims.

[0041] This application also discloses a loudspeaker, including the loudspeaker diaphragm described above, and a magnetic circuit system and a voice coil assembly connected to the loudspeaker diaphragm.

[0042] Compared with the prior art, this application has the following beneficial effects:

[0043] The method for manufacturing a loudspeaker diaphragm disclosed in this application involves molding a polymer to form a folded diaphragm substrate, and then using cathodic arc deposition technology to form a diamond-coated diaphragm on the substrate. The high hardness of diamond effectively enhances the rigidity of the diaphragm, reducing nonlinear deformation and local resonance during high-frequency vibration. The diaphragm surface is further optimized through thermal evaporation deposition in a vacuum environment, resulting in a vapor-deposited diaphragm that improves the diaphragm's stress resistance. A high-modulus carbon fiber prepreg is selected and wet-wound at a preset angle to create a carbon fiber voice coil skeleton, strengthening the vibration consistency and vibration resistance of the entire diaphragm assembly across a wide frequency range, especially in the high-frequency range. Frequency sweep testing is conducted, and the vibration characteristics of the diaphragm assembly are precisely adjusted based on the test results until the preset performance requirements are met, ensuring the final loudspeaker diaphragm assembly's performance in terms of sound clarity, frequency response, and dynamic range. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0046] Figure 1 This is a schematic diagram illustrating the overall steps of a loudspeaker diaphragm manufacturing process. Detailed Implementation

[0047] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In the description of this application, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0049] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] refer to Figure 1 This application provides a method for manufacturing a loudspeaker diaphragm, comprising:

[0051] S1: A polymer is molded to form a folded structure diaphragm substrate, and the folded structure diaphragm substrate is placed in a deposition cavity for cathodic arc deposition to obtain a diamond-coated diaphragm.

[0052] In step S1, polyimide is selected as the polymer, which provides sufficient initial rigidity to the diaphragm while possessing good processing adaptability. The molecular structure of polyimide allows it to remain stable under high temperature and pressure. The polyimide is molded into a diaphragm substrate with a specific geometric structure using a mold. The folded edge design employs an asymmetric wavy structure, with the amplitude controlled at 0.2–0.5 mm and the wavelength at 1.0–1.5 mm. The amplitude and wavelength parameters of the asymmetric wavy structure effectively disperse vibration stress, enhance the overall rigidity of the diaphragm, and optimize the vibration modes, resulting in smoother sound output. The mold temperature needs to be controlled at 250–300°C. This temperature range allows the polyimide to reach a suitable softening state, facilitating shaping while preventing overheating and degradation. The pressure is controlled at 10–15 MPa to ensure the material is fully filled in the mold and forms a flat surface with a flatness requirement of less than 0.1 μm. The initial Young's modulus of the resulting diaphragm substrate is approximately 100 GPa. After molding, the diaphragm substrate requires surface treatment. Ultrasonic cleaning removes impurities such as oil, particles, or processing residues from the substrate surface. Ultrasonic cleaning is performed in deionized water with an appropriate amount of cleaning agent for approximately 10-15 minutes to ensure surface cleanliness. After cleaning, the diaphragm substrate is placed in a vacuum drying oven and dried at 120°C for 2 hours to remove moisture and volatile substances, preventing bubbles or defects caused by volatiles during vacuum deposition. The dried substrate is then stored in an inert gas environment (such as nitrogen) to prevent oxidation or moisture absorption, thus maintaining surface stability. The diaphragm substrate is then placed in a vacuum cathodic arc deposition chamber. A high-hardness, high-rigidity nanodiamond coating is formed on the surface of the diaphragm substrate using cathodic arc deposition technology to significantly improve the acoustic performance of the diaphragm. The vacuum level of the deposition chamber needs to reach 10~ 5 To avoid interference from air molecules on the plasma, a high-purity carbon plasma was generated by applying a 500V DC voltage and controlling the arc current between 50 and 80A. This carbon plasma was deposited onto the diaphragm substrate surface under the influence of an electric field, forming a nanodiamond coating. During deposition, the substrate temperature was maintained at 100–150°C to prevent damage to the polyimide substrate from overheating, while ensuring effective carbon atom deposition. The deposition rate was controlled at 0.5–1 nm / s, forming a coating layer with a thickness of 500–800 nm. To further improve the coating quality, a pulsed bias technique was employed during deposition, with the bias voltage set to -100V and the frequency at 20kHz, which enhances the spp content of carbon atoms. 3 The bond ratio was adjusted to achieve a Young's modulus of 1050 GPa, approaching the hardness of natural diamond, thus significantly improving the rigidity and high-frequency response of the diaphragm. A trace amount of hydrogen gas (5 sccm flow rate) was introduced into the deposition chamber to optimize the crystal structure of the coating and reduce internal stress. The introduction of hydrogen gas effectively reduced sp...2 Bond formation promotes sp 3 The formation of bonds gives the coating higher hardness and lower surface roughness. Ultimately, the adhesion between the obtained nanodiamond coating and the substrate reaches 50 N / cm. 2 The surface roughness Ra is less than 2 nm.

[0053] S2: Under vacuum conditions, the diamond-coated diaphragm is placed in a thermal evaporation chamber, and the diamond-coated diaphragm is subjected to thermal evaporation deposition treatment to obtain a vapor-deposited diaphragm.

[0054] In step S2, the diamond-coated diaphragm is placed as a substrate inside a high-vacuum thermal evaporation chamber, and the vacuum level of the chamber can be 10. -6 In this process, high-purity platinum (Pt, 99.95% purity) is selected as the evaporation source material. Platinum can form a thin film layer with both damping and conductive properties on the diaphragm surface. During evaporation, the platinum material is placed in a crucible within the thermal evaporation chamber and heated to 1800-2000°C using electron beam heating, causing the platinum material to transform from a solid to a gaseous state. Electron beam heating has precise temperature control capabilities, enabling rapid heating of platinum above its melting point while avoiding contamination of the evaporation source by the crucible material, thus forming a platinum thin film layer with a thickness of 50-100 nm. During deposition, the diaphragm substrate rotates uniformly at a speed of 10 rpm, ensuring that the evaporated platinum atoms are uniformly deposited on the diaphragm surface, avoiding performance differences caused by uneven film thickness distribution. A trace amount of argon gas is introduced into the chamber at a flow rate controlled at 2 sccm (standard milliliters per minute) to regulate the pressure within the chamber, preventing oxidation of the platinum material at high temperatures and helping to maintain the stability of the evaporation process. The platinum layer, acting as a damping layer, effectively suppresses the resonance peaks of the diaphragm in the 60-70kHz high-frequency range. These high-frequency resonance peaks are undesirable vibrations produced by the speaker diaphragm at specific frequencies, which can lead to sound distortion or harshness. The addition of the platinum layer increases the damping characteristics of the diaphragm, rapidly attenuating these unwanted vibrations, thus resulting in a smoother, more natural sound. The platinum layer also possesses excellent electrical conductivity, with a surface resistivity controlled within 10 ohms. -8 The level of Ω·m helps stabilize the diaphragm's response under electromagnetic drive and reduces the impact of electrostatic accumulation on diaphragm performance.

[0055] S3: High-modulus carbon fiber prepreg is selected and wet-wound at a preset angle on the first mold to obtain a carbon fiber voice coil skeleton.

[0056] In step S3, the carbon fiber prepreg is a material composed of carbon fiber yarn and a resin matrix pre-impregnated composite. High-modulus carbon fiber refers to carbon fiber with an elastic modulus of over 300 GPa. Wet winding refers to the process where the carbon fiber prepreg, while still impregnated with resin, is directly wound onto the mold. The winding process is carried out on a cylindrical mold with a diameter of 5-10 mm, and the winding angle is set at 45°. This 45° winding angle achieves a balance between axial and circumferential mechanical properties, ensuring the tensile strength of the voice coil skeleton and enhancing its torsional resistance. The number of winding layers is 3-5, with a thickness controlled at 0.1-0.15 mm. After winding, the mold is cured in a curing oven at 180°C for 4 hours. The curing process causes the resin in the prepreg to undergo a cross-linking reaction, forming a robust composite material structure. The curing temperature of 180°C is suitable for most epoxy resin systems, allowing the curing reaction to be completed without excessive energy consumption. Residual resin on the surface is removed by 100W plasma cleaning for 5 minutes. Plasma cleaning utilizes high-energy plasma to bombard the surface of materials, effectively removing organic contaminants and trace amounts of resin, while also improving surface roughness and enhancing adhesion.

[0057] S4: The vapor-deposited diaphragm and the carbon fiber voice coil skeleton are bonded together with high-rigidity adhesive to obtain the diaphragm assembly;

[0058] In step S4, in a cleanroom environment, an adhesive with a hardness of 80D and a shear strength of 30MPa is selected. This adhesive is a high-performance epoxy or acrylic adhesive, possessing high hardness and excellent mechanical strength, ensuring a stable connection between the diaphragm and voice coil skeleton under high-frequency vibration. High hardness (80D) indicates high rigidity after curing, effectively transferring the diaphragm's vibrational energy to the voice coil skeleton. The shear strength of 30MPa ensures the shear resistance of the bonding interface, preventing peeling during long-term use. Before bonding, the Pt vapor-deposited diaphragm and carbon fiber voice coil skeleton are subjected to UV ozone cleaning for 10 minutes to increase the surface energy to 50mN / m. UV ozone cleaning is a surface modification technology that uses UV light to excite ozone molecules to generate highly active oxygen atoms, removing surface organic contaminants and increasing surface active sites, thereby improving the wettability and adhesion of the material surface. A surface energy of 50mN / m indicates that the material surface has reached a high polarity, suitable for forming a strong chemical and physical bond with the high-rigidity adhesive. Applying a pressure of 0.5 MPa during bonding ensures a tight fit between the diaphragm and voice coil frame, promoting thorough wetting and penetration of the adhesive at the interface, while also removing any potential micro-air bubbles. The bonded assembly is then cured for 2 hours at 25°C and 40% humidity. This temperature and humidity ensure smooth cross-linking of the adhesive, preventing excessive humidity from causing moisture absorption or insufficient humidity from leading to incomplete curing. The cured diaphragm assembly undergoes bond strength testing, such as measuring the interfacial peel force using a tensile testing machine, to ensure it meets the requirement of 40 N / cm².

[0059] S5: Perform a frequency sweep test on the diaphragm assembly, and adjust the vibration characteristics of the diaphragm assembly according to the test results until the preset performance requirements are met, thereby obtaining the speaker diaphragm assembly;

[0060] In step S5, after the manufacturing processes of steps S1 to S4 are completed, the diaphragm assembly, consisting of a diamond-coated diaphragm, a carbon fiber voice coil skeleton, and high-rigidity adhesive, possesses preliminary structural integrity and acoustic performance potential. A frequency sweep test is used to evaluate whether its vibration characteristics meet design requirements. The frequency sweep test is conducted in a laboratory environment, with the diaphragm assembly mounted on a speaker frame to simulate its operation in an actual speaker system. The testing equipment generates a series of continuously varying sine wave signals, covering a range from low to high frequencies, such as 20Hz to 20kHz, encompassing the audio frequency band perceptible to the human ear. By applying these sine wave excitations, the diaphragm assembly vibrates accordingly, and the testing equipment records parameters such as amplitude, phase, and frequency response, thereby generating the frequency response curve of the diaphragm assembly. This curve visually reflects the vibration behavior of the diaphragm assembly at different frequencies, such as the presence of resonance peaks and the flatness of the frequency response. For example, suppose the test finds a significant resonance peak in the diaphragm assembly at 500Hz, causing excessive sound output at that frequency, which may lead to sound distortion, thus requiring further adjustment. Based on the results of the frequency sweep test, the vibration characteristics of the diaphragm assembly are adjusted. These characteristics mainly include the diaphragm's rigidity, damping, mass distribution, and coupling effect with the voice coil skeleton. These factors directly affect the speaker's acoustic performance, such as clarity of sound, immersive low-frequency response, and detail in high frequencies. The adjustment process typically involves fine-tuning, i.e., making subtle modifications to the structural parameters or material properties of the diaphragm assembly. Adjustments to structural parameters may include changing the diaphragm's thickness, the geometry of the folded structure, or the distribution of adhesive points. For example, if the test reveals that the diaphragm's response in the mid-frequency range is not smooth enough, its vibration mode can be optimized by increasing the curvature of the folded structure or decreasing the thickness of the diaphragm's edges. Adjustments to material properties may involve fine-tuning the hardness or damping characteristics of the adhesive, such as using different adhesive formulations to change the coupling rigidity between the diaphragm and the voice coil skeleton. If the winding angle or fiber density of the carbon fiber voice coil skeleton has a significant impact on the vibration characteristics, the winding parameters of the prepreg can be readjusted and the skeleton can be remade. After adjustment, the diaphragm assembly needs to undergo another frequency sweep test to generate a new frequency response curve, which is then compared with the preset acoustic performance requirements. This process requires multiple iterations until the vibration characteristics of the diaphragm assembly meet the expected goals, such as a flat frequency response curve within the target frequency band without significant resonance peaks or attenuation.

[0061] In one scenario embodiment, it is assumed that the diaphragm assembly needs to meet the following preset performance requirements: within the range of 20Hz to 20kHz, the frequency response curve deviation does not exceed ±3dB, and there is no obvious resonance peak. In step S5, the diaphragm assembly is installed on the headphone frame, and a sine wave excitation of 20Hz to 20kHz is applied using a frequency sweep test device, and the frequency response of the diaphragm is recorded. The test results show that there is a resonance peak of +5dB at 2kHz, which will cause the high-frequency sound to be too sharp and affect the listening experience. Analysis suggests that this is due to insufficient rigidity of the folded edge structure of the diaphragm, resulting in excessive local vibration of the diaphragm at a specific frequency. To solve this problem, the curvature of the folded edge structure is finely adjusted to increase its curvature to enhance edge rigidity. At the same time, the adhesive is optimized, and an adhesive with higher damping characteristics is selected to suppress local vibration. After adjustment, the frequency sweep test is performed again, and the new frequency response curve shows that the resonance peak at 2kHz is effectively suppressed, and the deviation is reduced to within +2dB, meeting the preset requirements. However, the tests also revealed a slight attenuation in the low-frequency response (below 50Hz). Further adjustments were made to the winding angle of the carbon fiber voice coil skeleton to increase vibration efficiency in the low-frequency range. After three iterations of adjustment and testing, the frequency response of the diaphragm assembly finally met the ±3dB requirement, achieving the expected acoustic performance. Optimization was then complete, resulting in the speaker diaphragm assembly.

[0062] In one embodiment, the polymer is any one or a mixture of polyimide, polyetheretherketone, polyethylene terephthalate, and polycarbonate.

[0063] In one embodiment, the step of molding the polymer to form a folded diaphragm substrate includes:

[0064] Under the conditions of a second mold temperature of 250~300°C and a pressure of 10~15MPa, the polymer is molded to obtain an initial folded matrix. The second mold adopts an asymmetric wavy design with a wave amplitude of 0.2~0.5mm and a wave pitch of 1.0~1.5mm.

[0065] The initial folded substrate is placed in an ultrasonic cleaning device for cleaning, using deionized water as the cleaning medium, with the ultrasonic frequency set to 40~60kHz and the cleaning time to 5~10 minutes, to obtain the initial diaphragm substrate.

[0066] The initial diaphragm substrate is subjected to vacuum drying to obtain a dried diaphragm substrate;

[0067] The folded edge structure of the dried diaphragm substrate is modified by laser to obtain a folded edge structure diaphragm substrate, wherein the laser wavelength is 532nm and the pulse width is 10~20ns.

[0068] In this embodiment, during the molding process, the temperature of the second mold is set to 250-300°C. This temperature range allows the polymer to reach a suitable softened state, facilitating flow and molding. The pressure range is 10-15 MPa, enabling the polymer to fully fill the microstructure of the mold and form a precise folded shape. The asymmetric wavy mold has an amplitude of 0.2-0.5 mm and a wavelength of 1.0-1.5 mm. This design imparts specific geometric properties to the diaphragm substrate, giving it an optimized balance of flexibility and rigidity during vibration. For example, the wavy folded structure can increase the elasticity of the diaphragm, thereby improving the low-frequency response, while avoiding excessive rigidity that leads to high-frequency distortion. Deionized water is used as the cleaning medium, the ultrasonic frequency is 40-60 kHz, and the cleaning time is 5-10 minutes. Deionized water, due to its high purity, does not introduce new impurities. Ultrasonic cleaning, through high-frequency vibration generating microbubbles that burst instantaneously, effectively removes microscopic contaminants from the substrate surface. The initial diaphragm substrate requires vacuum drying to remove residual moisture or other volatile substances from the cleaning process. Vacuum drying is performed in a vacuum oven, with temperature and vacuum levels precisely controlled according to the characteristics of the polymer. For example, drying at a low-temperature vacuum environment of 80-100°C for 2-4 hours is used to avoid affecting the geometry of the folded structure due to high temperatures. Through vacuum drying, the moisture content of the initial diaphragm substrate can be reduced to below 0.1%, ensuring its surface and interior dryness. The folded structure of the dried diaphragm substrate is then laser-corrected to further optimize its geometric accuracy and surface quality, resulting in the final folded structure diaphragm substrate. Laser correction uses a 532nm wavelength laser with a pulse width of 10-20ns. This green laser features high precision and low thermal impact, making it suitable for processing the fine structures of polymers. The purpose of laser correction is to correct minor deviations in the folded structure, such as edge burrs or non-uniformity of the wavy structure that may occur during molding, thereby ensuring that the vibration characteristics of the diaphragm substrate meet design requirements. For example, if the folded edge amplitude formed by molding slightly exceeds 0.5 mm in some areas, laser correction can precisely ablate and remove excess material, keeping the amplitude precisely controlled within 0.3 mm while maintaining the smoothness of the folded edge surface. In practice, a laser processing system can be used, with a computer-controlled laser beam scanning along the folding path. The pulse width is set to 15 ns, and each correction removes approximately 1~2 μm of material thickness. After multiple scans, the geometric accuracy of the folded edge structure reaches a tolerance of ±0.01 mm.

[0069] In one embodiment, the step of placing the folded structure diaphragm substrate in a deposition cavity for cathodic arc deposition to obtain a diamond-coated diaphragm includes:

[0070] The folded structure diaphragm substrate is placed in the deposition chamber, the deposition chamber is evacuated to 10-5 Pa, hydrogen is introduced as a protective gas, and the deposition chamber is preheated to 80-100°C.

[0071] Using a high-purity graphite target as the cathode, a cathode arc discharge is initiated to perform low-speed pre-deposition on the surface of the folded structure diaphragm substrate. The DC voltage of the cathode arc discharge is 400V, the arc current is 40A, the deposition rate is 0.2~0.3nm / s, and the deposition time is 5~10 minutes.

[0072] The surface of the folded structure diaphragm substrate is subjected to a main deposition process. The arc current is adjusted to 50~80A and a -100V pulse bias voltage is applied. The deposition rate is increased to 0.5~1nm / s and deposition is continued for 20~30 minutes. At the same time, hydrogen gas is introduced into the deposition cavity to obtain a diamond-coated diaphragm.

[0073] In this embodiment, the folded-edge diaphragm substrate is placed in the deposition cavity, and the cavity is evacuated to 10°C. -5 A vacuum of 10 Pa was established, and hydrogen gas was introduced as a protective gas. The chamber was preheated to 80-100°C to create a clean and stable environment for cathodic arc deposition. After the substrate was placed in the deposition chamber, a vacuum of 10 Pa was applied. -5The ultra-high vacuum state of Pa effectively removes residual gases and impurities within the chamber, preventing interference from oxygen or moisture in the formation of the diamond coating. Hydrogen, as a protective gas, maintains a low-oxygen environment within the chamber and reacts with carbon atoms during deposition, promoting the formation of diamond-like carbon (DLC) or diamond films. Preheating the chamber to a temperature range of 80-100°C helps improve the activity of the substrate surface and enhances the adhesion of the deposited material. High-purity graphite targets are used as cathodes, and low-speed pre-deposition is initiated by cathode arc discharge, with specific parameters of 400V DC voltage, 40A arc current, deposition rate of 0.2-0.3 nm / s, and deposition time of 5-10 minutes. Cathode arc deposition is a physical vapor deposition (PVD) technique that uses arc discharge to generate plasma on the surface of the graphite target, releasing carbon atoms which are then deposited onto the substrate surface to form a diamond-like carbon or diamond film. The purpose of low-speed pre-deposition is to form a uniform initial carbon film on the substrate surface, improving the adhesion and film quality of subsequent main deposition. The high purity of the graphite target (typically ≥99.99%) ensures the purity of carbon atoms in the deposited film, preventing impurities from affecting the film's hardness and optical properties. The combination of a DC voltage of 400V and an arc current of 40A generates a stable arc discharge, producing an appropriate amount of carbon plasma, while a low deposition rate of 0.2~0.3 nm / s ensures the uniformity and density of the initial film. For example, assuming an engineer selects an 8-minute deposition time and a deposition rate of 0.25 nm / s in a certain production process, an initial carbon film of approximately 100~150 nm thick is formed on the surface of the folded structure diaphragm substrate during pre-deposition. This thin film not only covers the wavy area of ​​the folded structure but also reduces stress accumulation through low-speed deposition, avoiding the risk of film cracking or peeling. The successful implementation of low-speed pre-deposition provides a high-quality transition layer for subsequent main deposition, ensuring the overall performance of the diamond coating. By adjusting the arc current to 50-80A and applying a -100V pulsed bias, the deposition rate was increased to 0.5-1 nm / s, and deposition continued for 20-30 minutes while hydrogen gas was continuously introduced, ultimately resulting in a diamond-coated diaphragm. Increasing the arc current during the main deposition stage enhances plasma density and accelerates the deposition rate of carbon atoms, thus forming a thicker film in a shorter time. The application of the -100V pulsed bias guides carbon ions to deposit directionally on the substrate surface through the electric field, improving the film's density and surface smoothness while reducing defects within the film. The increased deposition rate of 0.5-1 nm / s allows the film thickness to reach 500-1800 nm within 20-30 minutes, meeting the diaphragm's requirements for hardness and acoustic performance. The continuous introduction of hydrogen gas reacts with the non-sp³ hybridized bonds in the carbon atoms, removing amorphous carbon components and thus increasing the sp³ hybridization of the film. 3 The bond ratio is adjusted to more closely resemble the crystal structure of diamond, and a diamond coating is formed on the surface of the folded structure diaphragm substrate.

[0074] In one embodiment, the step of placing the diamond-coated diaphragm in a thermal evaporation chamber under a vacuum environment and performing thermal evaporation deposition on the diamond-coated diaphragm to obtain a vapor-deposited diaphragm includes:

[0075] The diamond-coated diaphragm is placed in a thermal evaporation chamber, the vacuum level in the thermal evaporation chamber is adjusted to 10-7 Pa, and argon gas is introduced as a protective gas. At the same time, the temperature in the thermal evaporation chamber is raised to 200-220°C and kept constant.

[0076] Using a platinum target as the evaporation source, the platinum target is heated to 1800°C by an electron beam heating device, and the deposition rate is controlled at 0.2 nm / s. The surface of the diamond-coated diaphragm is subjected to thermal evaporation deposition treatment for 15 to 20 minutes to obtain a primary platinum-coated diaphragm.

[0077] Using a titanium target as an auxiliary evaporation source, the titanium target is heated to 1600°C by an electron beam heating device, and the deposition rate is controlled at 0.1 nm / s. A secondary thermal evaporation deposition treatment is performed on the surface of the primary platinum-plated diaphragm for 10 minutes to obtain the evaporated diaphragm.

[0078] In this embodiment, the diamond-coated diaphragm is placed inside the thermal evaporation chamber, and the vacuum level inside the chamber is adjusted to 10. -7 At the same time, argon gas is introduced as a protective gas, and the temperature inside the chamber is raised to 200~220°C and kept constant. The vacuum level is adjusted to 10. -7The ultra-high vacuum state of Pa significantly reduces the presence of residual gas molecules (such as oxygen or water vapor) within the cavity, thus preventing these impurities from reacting with the evaporation material during high-temperature deposition and affecting the coating quality. Maintaining a constant temperature of 200-220°C within the cavity enhances the thermal activity of the diaphragm surface, promoting the adhesion of the evaporation material and the uniformity of the film formation. Using a platinum target as the evaporation source, a high-energy electron beam heats the target, allowing its surface atoms to gain sufficient energy to evaporate, subsequently depositing onto the substrate surface in a vacuum environment to form a thin film. The electron beam heating device can control the temperature of the platinum target, heating it to 1800°C, causing platinum atoms to be released in gaseous form from the target surface, enter the cavity, and deposit onto the diaphragm surface. Controlling the deposition rate at a low speed of 0.2 nm / s helps form a uniform and dense platinum film, avoiding film defects or stress accumulation caused by excessively rapid deposition. The deposition time of 15-20 minutes ensures that the platinum coating reaches an appropriate thickness (approximately 180-240 nm), covering the surface of the diamond-coated diaphragm while maintaining its original geometry and acoustic properties. Titanium's melting point (approximately 1668°C) is lower than platinum's; heating to 1600°C ensures stable evaporation of the titanium target while avoiding excessive thermal stress on the primary platinum or diamond coating. The deposition rate is controlled at 0.1 nm / s, lower than platinum deposition, primarily to form an extremely thin and uniform titanium film (approximately 60 nm) on the platinum coating surface. This further improves the diaphragm's surface hardness and wear resistance while maintaining its flexibility and acoustic response. The introduction of the titanium film may form a composite coating structure through interfacial interaction with the platinum film, thereby further enhancing its mechanical properties and environmental adaptability while maintaining the diaphragm's conductivity. The continuous introduction of argon gas is equally important in the secondary deposition process. Its inert protective effect prevents titanium atoms from being oxidized during evaporation and deposition, ensuring the purity and quality of the titanium film, thereby obtaining the vapor-deposited diaphragm.

[0079] In one embodiment, the step of selecting high-modulus carbon fiber prepreg and wet-winding it at a preset angle on a first mold to obtain a carbon fiber voice coil skeleton includes:

[0080] The high-modulus carbon fiber prepreg is wet-wound to the first mold at a preset angle, wherein the preset angle is 40~50° and the number of winding layers is 3~6 layers, to obtain a primary wound body;

[0081] The primary winding body and the first mold are placed in a high-temperature curing oven for curing treatment. After being kept at a temperature of 120~125°C for 120~150 minutes, the temperature is raised to 180~190°C and kept for 200~230 minutes to obtain a cured carbon fiber skeleton.

[0082] The cured carbon fiber skeleton is placed in a deposition chamber, and a nanoscale silicon carbide coating is deposited on the surface of the cured carbon fiber skeleton. The target power is 200~300W, and the deposition time is 10~15 minutes to obtain the carbon fiber voice coil skeleton.

[0083] In this embodiment, high-modulus carbon fiber prepreg is selected and wet-wound at a preset angle of 40-50° on a first mold, with 3-6 winding layers to obtain a primary wound body. High-modulus carbon fiber prepreg is a material pre-impregnated with high-strength, high-modulus carbon fibers and resin (such as epoxy resin), possessing excellent mechanical properties, including high tensile strength, rigidity, and low density. Wet winding involves winding the prepreg at a specific angle onto a mold to form the desired shape. The preset angle of 40-50° is chosen based on the need for the voice coil skeleton to withstand complex stresses in acoustic devices. This angle range optimizes the distribution of fiber mechanical properties in the axial and circumferential directions, ensuring good tensile and torsional resistance during dynamic vibration. The setting of 3-6 winding layers balances the thickness and weight of the skeleton; too few layers may lead to insufficient strength, while too many layers increase mass and affect the voice coil's response speed. The first mold can be cylindrical or conical to accommodate the voice coil's assembly requirements in the loudspeaker. During wet winding, the resin in the prepreg remains moist during winding. Tension control equipment ensures the fibers adhere tightly to the mold surface, preventing defects such as bubbles or folds, thus forming a uniform primary winding. The primary winding, along with the first mold, is placed in a high-temperature curing oven for curing. Initially, it is held at 120-125°C for 120-150 minutes, then the temperature is increased to 180-190°C and held for 200-230 minutes, resulting in a cured carbon fiber skeleton. High-temperature curing causes a cross-linking reaction in the prepreg, forming a robust matrix structure and firmly locking the carbon fibers in their predetermined positions. The initial low-temperature curing at 120-125°C allows the resin to cure slowly, releasing any residual internal stress from the winding process and preventing uneven resin flow or bubble formation caused by rapid heating. Holding the curing time for 120-150 minutes ensures the resin fully penetrates the fiber gaps, forming a uniform matrix structure. The temperature is then raised to 180-190°C and maintained for 200-230 minutes to complete the deep cross-linking reaction of the resin, further enhancing the mechanical strength and thermal stability of the cured carbon fiber skeleton. This temperature control strategy not only optimizes the degree of resin curing but also prevents potential damage to the carbon fiber performance from high temperatures. During curing, the first mold continues to play a shaping role, ensuring that the primary winding does not deform at high temperatures. Simultaneously, the mold's thermal conductivity helps to evenly transfer heat, promoting the uniformity of the curing reaction. After curing, the primary winding transforms into a cured carbon fiber skeleton with high strength and rigidity. The cured carbon fiber skeleton is placed in a deposition chamber, and a nanoscale silicon carbide coating is deposited on its surface. The target power is 200-300W, and the deposition time is 10-15 minutes, ultimately yielding a carbon fiber voice coil skeleton. Silicon carbide is a high-hardness, wear-resistant, and high-temperature-resistant ceramic material; its nanoscale coating can significantly improve the surface properties of the carbon fiber skeleton and extend the lifespan of the voice coil.The deposition process can employ physical vapor deposition (PVD) techniques, such as magnetron sputtering or ion beam deposition. High-energy particles bombard a silicon carbide target, causing surface atoms to sputter and deposit onto the carbon fiber skeleton surface. Setting the target power to 200-300W controls the sputtering rate, ensuring silicon carbide atoms are deposited onto the substrate surface with appropriate energy, forming a uniform and dense nanoscale coating. A deposition time of 10-15 minutes controls the coating thickness, allowing it to range from tens to hundreds of nanometers. This significantly improves surface hardness and wear resistance without significantly increasing the skeleton's mass or altering its geometry. The introduction of the silicon carbide coating not only enhances the skeleton's wear resistance but also strengthens its stability under high-temperature or high-frequency vibration environments, thereby optimizing the dynamic performance of the voice coil skeleton in the loudspeaker.

[0084] In one embodiment, the step of bonding the vapor-deposited diaphragm to the carbon fiber voice coil skeleton with high-rigidity adhesive to obtain the diaphragm assembly includes:

[0085] The vapor-deposited diaphragm and carbon fiber voice coil skeleton are placed in an ultraviolet ozone cleaning device to clean the surfaces of the vapor-deposited diaphragm and carbon fiber voice coil skeleton.

[0086] Epoxy resin and curing agent are mixed and stirred at a mass ratio of 10~9:1. Silica particles are added during the mixing process to obtain a high-rigidity adhesive.

[0087] The high-rigidity adhesive is applied at a dispensing amount of 0.015~0.025g to the bonding area of ​​the cleaned vapor-deposited diaphragm and carbon fiber voice coil skeleton, and then aligned and bonded to obtain a preliminary bonded assembly.

[0088] The preliminary bonding assembly is placed in a constant temperature curing oven and cured at a low temperature of 25~30°C for 1.5~2.5 hours to obtain the diaphragm assembly.

[0089] In this embodiment, the vapor-deposited diaphragm and carbon fiber voice coil skeleton are placed in an ultraviolet ozone cleaning device for surface cleaning. The ultraviolet ozone cleaning device uses ultraviolet light to excite oxygen in the air to generate ozone, which is further decomposed into active oxygen atoms. These active oxygen atoms can effectively oxidize and remove organic contaminants from the surface, while simultaneously introducing hydroxyl groups or other active groups onto the material surface, thereby improving surface wettability and chemical activity. This surface modification not only enhances the bonding force between the material and the adhesive but also ensures the uniformity and stability of the bonding interface. The cleaning process is carried out at room temperature for several minutes to over ten minutes, the specific time depending on the degree of surface contamination and the power of the equipment, to ensure the surface reaches the optimal bonding state. Epoxy resin and curing agent are mixed and stirred at a mass ratio of 10~9:1, and silica particles are added during the mixing process to obtain a high-rigidity adhesive. Epoxy resin is a commonly used high-performance adhesive with excellent bonding strength, chemical resistance, and mechanical stability. Curing agents (such as amines or anhydrides) react with epoxy groups to form a three-dimensional cross-linked network, giving the adhesive high hardness and rigidity after curing. Silica, as an inorganic filler, has high hardness and a low coefficient of thermal expansion. Its particle size is in the micrometer or nanometer range, significantly improving the mechanical properties and shear resistance of the adhesive. Adding silica slightly increases the viscosity of the adhesive, but appropriate fluidity must still be maintained for subsequent dispensing operations. The high-rigidity adhesive is applied at a dispensing rate of 0.015~0.025g to the bonding area of ​​the cleaned vapor-deposited diaphragm and carbon fiber voice coil frame, followed by alignment bonding to obtain a preliminary bonded assembly. The dispensing process can be performed using dispensing equipment, such as a pneumatic or electric dispensing machine, controlling the needle size and pressure to achieve uniform application of a small amount of adhesive. The selection of the bonding area needs to be determined based on the structural design of the diaphragm and voice coil skeleton. It can be the edge of the diaphragm and the connection point of the voice coil skeleton to ensure efficient vibration transmission and structural stability. Alignment bonding requires precise spatial alignment of the vapor-deposited diaphragm and carbon fiber voice coil skeleton, which can be achieved using clamps or a visual alignment system to ensure the geometric accuracy of the bonded assembly. Appropriate pressure needs to be applied during bonding to ensure the adhesive is evenly distributed at the bonding interface, while avoiding excessive pressure that could cause adhesive overflow or diaphragm deformation. The pre-bonded assembly is placed in a constant-temperature curing oven for low-temperature curing at 25-30°C for 1.5-2.5 hours to obtain the diaphragm assembly. Low-temperature curing allows the epoxy resin and hardener to react slowly, forming a uniform cross-linked network, avoiding thermal stress or material deformation that may occur with high-temperature curing. The constant-temperature curing oven provides a stable temperature environment, avoiding interference from temperature fluctuations on the curing reaction. Furthermore, low-temperature curing poses no risk of damage to the thin-film structure of the vapor-deposited diaphragm and the composite material of the carbon fiber voice coil skeleton, ensuring the acoustic and mechanical properties of the assembly.After curing, the epoxy resin in the high-rigidity adhesive forms a robust three-dimensional cross-linked structure, and the silica particles further enhance the hardness and fatigue resistance of the adhesive layer, giving the diaphragm assembly excellent vibration transmission efficiency and long-term reliability.

[0090] In one embodiment, the step of performing a frequency sweep test on the diaphragm assembly and adjusting the vibration characteristics of the diaphragm assembly according to the test results until a preset performance requirement is met, thereby obtaining the speaker diaphragm assembly, includes:

[0091] A sinusoidal excitation signal is applied to the diaphragm assembly within a preset frequency range, and the amplitude, phase, and frequency response characteristics of the diaphragm assembly are measured to obtain preliminary vibration characteristic data.

[0092] Determine whether the preliminary vibration characteristic data meets the preset performance requirements;

[0093] If not, based on the difference between the preliminary vibration characteristic data and the preset performance requirements, a polymer damping material is coated on the edge region of the diaphragm assembly to adjust the boundary vibration characteristics of the diaphragm assembly until the preliminary vibration characteristic data meets the preset performance requirements, thus obtaining the loudspeaker diaphragm assembly.

[0094] In this embodiment, the initial frequency sweep test involves comprehensively acquiring preliminary vibration characteristic data of the diaphragm assembly by applying a sinusoidal excitation signal. Specifically, within a preset frequency range, typically covering the operating frequency range of the loudspeaker (e.g., 20 Hz to 20 kHz), a sinusoidal signal is applied to the diaphragm assembly using a high-precision audio analysis device. This signal acts on the diaphragm at progressively increasing frequencies, and the device records the amplitude, phase, and frequency response characteristics of the diaphragm at each frequency in real time, thus forming a set of detailed preliminary vibration characteristic data. After obtaining the preliminary vibration characteristic data, the vibration behavior of the diaphragm is further analyzed through finite element simulation. Finite element simulation is a computation-based analysis method that establishes a three-dimensional digital model of the diaphragm assembly and inputs the preliminary vibration characteristic data into the model to simulate the vibration modes of the diaphragm under different frequency excitations. This process can be handled by a high-performance computing platform to handle complex numerical calculation tasks. The simulation model combines the material properties of the diaphragm (such as Young's modulus, density, Poisson's ratio, etc.) and geometric parameters (such as thickness, shape, edge constraints, etc.) to calculate the modal shape, nodal line position, and resonance peak characteristics of the diaphragm at each frequency. By analyzing the vibration modal distribution, it is possible to identify whether the diaphragm exhibits excessive amplitude or unwanted resonance at specific frequencies. For example, if simulation results show that the amplitude in the central region of the diaphragm is too large at a certain frequency, it may be necessary to adjust the mass distribution or rigidity of that region to suppress abnormal vibrations. Based on the analysis results of the vibration modal distribution, local mass distribution adjustments are made to the diaphragm assembly to optimize its vibration characteristics. This process is achieved by adding or removing trace amounts of high-density material, such as using metal films or polymer composites, in specific areas of the diaphragm. The adjustment process typically employs precision laser etching or micromaterial deposition techniques to ensure the accuracy of material addition or removal. For example, if simulations show that the vibration modes in a certain region result in excessively high resonance peaks, local mass can be increased by depositing trace amounts of high-density material in that region, thereby altering the vibration characteristics of that region. Conversely, if the amplitude in a certain region is insufficient, some material can be removed by laser etching to reduce mass. The goal of the adjustment is to balance the vibration modes of the diaphragm, suppress unwanted resonance peaks, and maintain the overall rigidity and lightweight characteristics of the diaphragm to ensure its acoustic performance and mechanical durability in the loudspeaker. This process requires repeated verification of the adjustment effects to ensure that each fine-tuning gradually approaches the preset performance requirements. After completing the mass distribution adjustment, a secondary frequency sweep test is performed on the optimized diaphragm assembly to evaluate the adjustment effect and obtain optimized vibration characteristic data. The conditions for the secondary frequency sweep test are consistent with the initial test, using the same frequency range and sinusoidal excitation signal. The amplitude, phase, and frequency response characteristics of the diaphragm are measured using a high-precision sensor and a spectrum analyzer. Compared with the initial test, the focus of the secondary test is to verify whether the mass distribution adjustment effectively improves the vibration behavior of the diaphragm, such as whether it successfully suppresses abnormal resonance or optimizes the frequency response curve.The test results will generate a set of optimized vibration characteristic data. Comparing this data with the initial data provides a clear picture of the adjustment effect. If the data indicates that the diaphragm's vibration characteristics have significantly improved but still do not fully meet the preset requirements, further optimization is needed. Based on the analysis of the optimized vibration characteristic data, boundary damping treatment is applied to the diaphragm assembly to further adjust its vibration characteristics. This process mainly focuses on the edge region of the diaphragm, altering the boundary vibration characteristics by coating with polymer damping materials or bonding flexible damping layers. Polymer damping materials typically have high internal friction characteristics, effectively absorbing vibration energy and reducing vibration interference caused by boundary reflections. The coating process uses automated coating equipment to ensure uniform thickness and distribution of the damping material and good adhesion. For example, the damping coefficient of the diaphragm can be precisely adjusted by controlling the thickness of the damping layer (between 0.1 mm and 0.5 mm) and the range of the coating area, thereby optimizing its acoustic stability. The purpose of boundary damping treatment is to reduce vibration reflections at the diaphragm edges, improve the smoothness of the frequency response, and avoid excessive damping affecting the diaphragm's sensitivity. This process involves multiple experiments using optimized vibration characteristic data to ensure the damping effect matches the preset performance requirements. A final performance verification test is then conducted on the optimized diaphragm assembly to confirm its compliance with the speaker's performance requirements. This test is performed in an acoustic testing chamber simulating a real-world usage environment. The diaphragm assembly is assembled into the speaker frame, and its sound pressure level (SPL), distortion rate, and frequency response characteristics are measured using a multi-band sweep test. The testing equipment typically includes a multi-channel audio analysis system capable of comprehensively evaluating the diaphragm's acoustic performance and mechanical stability. For example, the SPL test verifies the diaphragm's output capability at different frequencies, the distortion rate test assesses its nonlinear distortion level, and the frequency response test confirms whether its overall acoustic performance is smooth and meets design requirements. If the test results show that the diaphragm assembly's performance has met the preset standards, such as stable SPL, distortion rate below 1%, and a smooth frequency response curve, it can be confirmed as the final speaker diaphragm assembly. If deficiencies remain, the previous steps must be repeated to further adjust the specific issues until the requirements are met.

[0095] In another embodiment, the calculation expression of the above embodiment is:

[0096] ;in, To optimize vibration characteristics, the score represents the overall vibration characteristics of the diaphragm assembly after optimization. The lower the value, the closer the diaphragm performance is to the preset requirements. Integrating over the frequency range, with respect to the frequency range [ , Integrate the frequencies covered by the loudspeaker's operating frequency (e.g., 20 Hz to 20 kHz). Φ(f) is the amplitude response, representing the amplitude response of the diaphragm at frequency f, reflecting the vibration intensity of the diaphragm; Φ(f) is the phase response, representing the phase response of the diaphragm at frequency f, representing the phase difference between the vibration signal and the excitation signal; R(f) is the actual frequency response, representing the actual frequency response of the diaphragm at frequency ff. The reference frequency response represents the preset ideal frequency response curve, i.e., the target acoustic performance. Frequency response deviation represents the absolute deviation between the actual frequency response and the reference response; The mass distribution adjustment factor represents the degree of adjustment to the local mass distribution of the diaphragm at frequency f, which is achieved by adding or removing material. The boundary damping factor represents the damping characteristics of the diaphragm edge region at frequency f, which is adjusted by coating with a polymer damping material. , and These are the weighting coefficients, representing the weighting coefficients for amplitude, phase, and frequency response deviation, respectively, used to balance the contributions of these three factors in the optimization process. and , where is the damping influence coefficient, and are the exponential influence coefficients of mass adjustment and boundary damping on vibration characteristics, respectively; The exponential decay term represents the combined suppression effect of mass adjustment and boundary damping on vibration characteristics. This calculation expression comprehensively considers the amplitude, phase, and frequency response deviations of the diaphragm across the entire frequency range through integral form, and balances the contributions of the three through weighting coefficients. The exponential term introduces the nonlinear effects of mass adjustment and boundary damping, simulating the complex dynamic behavior in the actual optimization process. The formula output serves as the optimization objective, guiding the iterative adjustment of the diaphragm until the preset performance requirements (such as distortion rate <1% and smooth frequency response) are met. It is worth noting that this formula expression is a further optimization based on the original implementation embodiment and does not affect the original technical effects and core of this application.

[0097] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for manufacturing a loudspeaker diaphragm, characterized in that, include: A polymer is molded to form a folded structure diaphragm substrate, and the folded structure diaphragm substrate is placed in a deposition chamber for cathodic arc deposition to obtain a diamond-coated diaphragm. In a vacuum environment, the diamond-coated diaphragm is placed in a thermal evaporation chamber, and the diamond-coated diaphragm is subjected to thermal evaporation deposition treatment to obtain a vapor-deposited diaphragm. High-modulus carbon fiber prepreg is selected and wet-wound at a preset angle on the first mold to obtain a carbon fiber voice coil skeleton. The vapor-deposited diaphragm and the carbon fiber voice coil skeleton are bonded together with high-rigidity adhesive to obtain a diaphragm assembly. The diaphragm assembly is subjected to a frequency sweep test, and the vibration characteristics of the diaphragm assembly are adjusted according to the test results until the preset performance requirements are met, thus obtaining the speaker diaphragm assembly.

2. The method for manufacturing a loudspeaker diaphragm according to claim 1, characterized in that, The polymer is any one or a mixture of polyimide, polyetheretherketone, polyethylene terephthalate, and polycarbonate.

3. The method for manufacturing a loudspeaker diaphragm according to claim 1, characterized in that, The step of molding the polymer to form a folded diaphragm substrate includes: Under the conditions of a second mold temperature of 250~300°C and a pressure of 10~15MPa, the polymer is molded to obtain an initial folded matrix. The second mold adopts an asymmetric wavy design with a wave amplitude of 0.2~0.5mm and a wave pitch of 1.0~1.5mm. The initial folded substrate is placed in an ultrasonic cleaning device for cleaning, using deionized water as the cleaning medium, with the ultrasonic frequency set to 40~60kHz and the cleaning time to 5~10 minutes, to obtain the initial diaphragm substrate. The initial diaphragm substrate is subjected to vacuum drying to obtain a dried diaphragm substrate; The folded edge structure of the dried diaphragm substrate is modified by laser to obtain a folded edge structure diaphragm substrate, wherein the laser wavelength is 532nm and the pulse width is 10~20ns.

4. The method for manufacturing a loudspeaker diaphragm according to claim 1, characterized in that, The step of placing the folded structure diaphragm substrate in a deposition cavity for cathodic arc deposition to obtain a diamond-coated diaphragm includes: The folded structure diaphragm substrate is placed in the deposition chamber, the deposition chamber is evacuated to 10-5 Pa, hydrogen is introduced as a protective gas, and the deposition chamber is preheated to 80-100°C. Using a high-purity graphite target as the cathode, a cathode arc discharge is initiated to perform low-speed pre-deposition on the surface of the folded structure diaphragm substrate. The DC voltage of the cathode arc discharge is 400V, the arc current is 40A, the deposition rate is 0.2~0.3nm / s, and the deposition time is 5~10 minutes. The surface of the folded structure diaphragm substrate is subjected to a main deposition process. The arc current is adjusted to 50~80A and a -100V pulse bias voltage is applied. The deposition rate is increased to 0.5~1nm / s and deposition is continued for 20~30 minutes. At the same time, hydrogen gas is introduced into the deposition cavity to obtain a diamond-coated diaphragm.

5. The method for manufacturing a loudspeaker diaphragm according to claim 1, characterized in that, The step of placing the diamond-coated diaphragm in a thermal evaporation chamber under vacuum and performing thermal evaporation deposition on the diamond-coated diaphragm to obtain the vapor-deposited diaphragm includes: The diamond-coated diaphragm is placed in a thermal evaporation chamber, the vacuum level in the thermal evaporation chamber is adjusted to 10-7 Pa, and argon gas is introduced as a protective gas. At the same time, the temperature in the thermal evaporation chamber is raised to 200-220°C and kept constant. Using a platinum target as the evaporation source, the platinum target is heated to 1800°C by an electron beam heating device, and the deposition rate is controlled at 0.2 nm / s. The surface of the diamond-coated diaphragm is subjected to thermal evaporation deposition treatment for 15 to 20 minutes to obtain a primary platinum-coated diaphragm. Using a titanium target as an auxiliary evaporation source, the titanium target is heated to 1600°C by an electron beam heating device, and the deposition rate is controlled at 0.1 nm / s. A secondary thermal evaporation deposition treatment is performed on the surface of the primary platinum-plated diaphragm for 10 minutes to obtain the evaporated diaphragm.

6. The method for manufacturing a loudspeaker diaphragm according to claim 1, characterized in that, The step of selecting high-modulus carbon fiber prepreg and wet-winding it at a preset angle on a first mold to obtain a carbon fiber voice coil skeleton includes: The high-modulus carbon fiber prepreg is wet-wound to the first mold at a preset angle, wherein the preset angle is 40~50° and the number of winding layers is 3~6 layers, to obtain a primary wound body; The primary winding body and the first mold are placed in a high-temperature curing oven for curing treatment. After being kept at a temperature of 120~125°C for 120~150 minutes, the temperature is raised to 180~190°C and kept for 200~230 minutes to obtain a cured carbon fiber skeleton. The cured carbon fiber skeleton is placed in a deposition chamber, and a nanoscale silicon carbide coating is deposited on the surface of the cured carbon fiber skeleton. The target power is 200~300W, and the deposition time is 10~15 minutes to obtain the carbon fiber voice coil skeleton.

7. The method for manufacturing a loudspeaker diaphragm according to claim 1, characterized in that, The step of bonding the vapor-deposited diaphragm to the carbon fiber voice coil skeleton with high-rigidity adhesive to obtain the diaphragm assembly includes: The vapor-deposited diaphragm and carbon fiber voice coil skeleton are placed in an ultraviolet ozone cleaning device to clean the surfaces of the vapor-deposited diaphragm and carbon fiber voice coil skeleton. Epoxy resin and curing agent are mixed and stirred at a mass ratio of 10~9:

1. Silica particles are added during the mixing process to obtain a high-rigidity adhesive. The high-rigidity adhesive is applied at a dispensing amount of 0.015~0.025g to the bonding area of ​​the cleaned vapor-deposited diaphragm and carbon fiber voice coil skeleton, and then aligned and bonded to obtain a preliminary bonded assembly. The preliminary bonding assembly is placed in a constant temperature curing oven and cured at a low temperature of 25~30°C for 1.5~2.5 hours to obtain the diaphragm assembly.

8. The method for manufacturing a loudspeaker diaphragm according to claim 1, characterized in that, The step of performing a frequency sweep test on the diaphragm assembly and adjusting the vibration characteristics of the diaphragm assembly according to the test results until the preset performance requirements are met, thereby obtaining the speaker diaphragm assembly, includes: A sinusoidal excitation signal is applied to the diaphragm assembly within a preset frequency range, and the amplitude, phase, and frequency response characteristics of the diaphragm assembly are measured to obtain preliminary vibration characteristic data. Determine whether the preliminary vibration characteristic data meets the preset performance requirements; If not, based on the difference between the preliminary vibration characteristic data and the preset performance requirements, a polymer damping material is coated on the edge region of the diaphragm assembly to adjust the boundary vibration characteristics of the diaphragm assembly until the preliminary vibration characteristic data meets the preset performance requirements, thus obtaining the loudspeaker diaphragm assembly.

9. A loudspeaker diaphragm, characterized in that, It is manufactured using the method for manufacturing a loudspeaker diaphragm according to any one of claims 1 to 8.

10. A loudspeaker, characterized in that, It includes the loudspeaker diaphragm as described in claim 9, as well as the magnetic circuit system and voice coil assembly connected to the loudspeaker diaphragm.

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