Efficient device for coating FEP (fluorinated ethylene propylene) film on electret microphone

Abstract

The utility model discloses an efficient device for coating FEP film on electret microphone, which comprises a support table, a rear polar plate clamp, a heating module, a distance module and a vacuum module, an inner cavity is arranged in the support table, the rear polar plate clamp is arranged on the support table, and the distance module is arranged in the inner cavity. At least one through hole and a rear polar plate fixing groove are formed in the rear polar plate clamp in a combined mode, the through hole and the vacuum module are both connected with the inner cavity, and the distance fixing module is used for extruding a rear polar plate fixed to the rear polar plate clamp. The utility model aims to solve the technical problems in the prior art, and provides the efficient device for laminating the FEP thin film on the electret microphone, which can directly press and paste the FEP thin film without generating wrinkles and bubbles, and ensures that the thicknesses of the pasted films are the same.

Description

Technical Field

[0001] This utility model relates to the field of microphone technology, specifically to a device for coating a high-efficiency electret microphone with an FEP film. Background Technology

[0002] An electret microphone is a transducer that converts sound into electricity using electret materials and is widely used in acoustic testing equipment. Its core components include the electret diaphragm, back electrode, and diaphragm. The electret diaphragm is typically made of perfluoroethylene propylene (FEP) film due to its excellent mechanical strength and dielectric properties. Currently, the fabrication technology for FEP films is quite mature both domestically and internationally, capable of producing films of various specifications such as 12.5μm, 25μm, and 30μm with virtually no thickness deviation. Precisely attaching the FEP film to the surface of the electret material is a crucial step in the production process, directly affecting the microphone's sensitivity, frequency response, and lifespan.

[0003] In existing processes, FEP film lamination is mostly done manually or with simple mechanical equipment, which presents the following problems: First, the lamination firmness is low, and the film is prone to detachment from the back electrode plate; second, air bubbles or wrinkles are easily generated during the lamination process, leading to unstable acoustic performance; and third, the film thickness is uncontrollable. With the ever-increasing performance requirements of electronic products for microphones, existing technologies are no longer sufficient to meet the demands of high-precision and high-efficiency production. Therefore, there is an urgent need for a device and method that can automate, efficiently, and firmly laminate FEP films to optimize the manufacturing process of electret microphones and improve product quality and production efficiency. Utility Model Content

[0004] 1. Technical problem to be solved by the utility model

[0005] The purpose of this invention is to solve the technical problems existing in the prior art and provide a highly efficient device for bonding FEP film to electret microphones. It can directly press the FEP film without producing wrinkles or bubbles, and ensure that the film thickness is the same.

[0006] 2. Technical Solution

[0007] To solve the above problems, the technical solution provided by this utility model is as follows:

[0008] A high-efficiency electret microphone coated with an FEP film includes a support platform, a rear electrode clamp, a heating module, a spacing module, and a vacuum module. The support platform has an inner cavity. The rear electrode clamp is disposed on the support platform and has at least one through hole and a rear electrode fixing groove combined on it. The through hole and the vacuum module are both connected to the inner cavity. The spacing module is used to press and fix the rear electrode to the rear electrode clamp.

[0009] Optionally, the rear electrode plate clamp is located at the upper end of the support platform, and the rear electrode plate fixing groove is located at the upper end of the through hole.

[0010] Optionally, the support platform and the rear electrode clamp are in thermally conductive contact, and the heating module includes a ceramic heating coil wound around the support platform.

[0011] Optionally, the heating module further includes a temperature sensor for measuring the temperature of the rear electrode clamp.

[0012] Optionally, the vacuum module includes a vacuum generator and a heat dissipation structure, wherein the vacuum generator is connected to the inner cavity through the heat dissipation structure.

[0013] Optionally, the distance-fixing module includes a pressure plate and a cylinder, the cylinder being used to control the pressure plate to move back and forth relative to the rear electrode clamp.

[0014] Optionally, a high-temperature resistant pressure block is provided on the side of the pressure plate that contacts the rear electrode clamp.

[0015] Optionally, it also includes a bracket for lifting the support platform upwards.

[0016] 3. Beneficial effects

[0017] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0018] 1. Improved film adhesion enhances the performance and stability of electret microphones.

[0019] 2. Remove wrinkles and air bubbles generated during the film application process to improve microphone performance.

[0020] 3. Ensure the film thickness is consistent to improve product uniformity. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a device for coating an electret microphone with an FEP film, as proposed in an embodiment of this utility model.

[0022] Figure 2 A cross-sectional schematic diagram of a device for coating an electret microphone with an FEP film, as proposed in an embodiment of this utility model.

[0023] Figure 3 A cross-sectional schematic diagram of the rear electrode plate clamp in a device for coating an electret microphone with an FEP film, as proposed in an embodiment of this utility model.

[0024] 1. Support platform; 1a. Inner cavity; 2. Rear electrode plate clamp; 2a. Through hole; 2b. Rear electrode plate fixing groove; 3. Heating module; 31. Ceramic heating ring; 32. Temperature sensor; 4. Distance module; 41. Pressure plate; 42. Cylinder; 43. High temperature resistant pressure block; 5. Vacuum module; 51. Vacuum generator; 52. Heat dissipation structure; 6. Bracket. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and do not limit the scope of protection of this utility model.

[0026] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component. Furthermore, when a component is considered to be "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in the prior art and will not be elaborated further here. When a component is perpendicular or approximately perpendicular to another component, it means that the ideal state is perpendicularity, but due to manufacturing and assembly effects, there may be a certain degree of perpendicularity error. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only and do not represent the only possible implementation.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] The terms "first" and "second" in this utility model do not represent specific quantities or orders, but are merely used to distinguish names.

[0029] Combined with appendix Figures 1-3This embodiment of a device for coating an electret microphone with an FEP film includes a support platform 1, a rear electrode plate clamp 2, a heating module 3, a spacing module 4, and a vacuum module 5. The support platform 1 is a cylindrical structure with a hollow interior forming an inner cavity 1a. The rear electrode plate clamp 2 is disposed on the support platform 1, and at least one through hole 2a and a rear electrode plate fixing groove 2b are combined on the rear electrode plate clamp 2. The through hole 2a and the rear electrode plate fixing groove 2b are coaxially arranged, and the rear electrode plate fixing groove 2b is located on the outer side of the rear electrode plate clamp 2. The through hole 2a and the vacuum module 5 are both connected to the inner cavity 1a. The spacing module 4 is used to press and fix the rear electrode plate on the rear electrode plate clamp 2.

[0030] Before lamination, the following steps are performed on the apparatus for bonding the FEP film to this high-efficiency electret microphone: The rear electrode plate is installed into the rear electrode plate fixture, and then the entire rear electrode plate fixture is installed into the support platform. The cut FEP film is then placed on the surface of the rear electrode plate, covering all of it. Afterwards, the heating module 3 starts working, and the vacuum module 5 is simultaneously activated, adsorbing the rear electrode plate onto the rear electrode plate fixture 2, and then adsorbing the FEP film onto the rear electrode plate, further fixing the rear electrode plate and the FEP film. Once the FEP film melts, the spacing module 4 applies pressure to adhere the FEP film to the rear electrode plate.

[0031] This high-efficiency electret microphone coating FEP film device achieves film coating spacing through a special cooperative structure between the rear electrode clamp 2 and the spacing module 4, ensuring consistent thickness of the FEP film after compression. Furthermore, the pressing method improves the film adhesion, enhancing the performance and stability of the electret microphone, while also removing wrinkles and air bubbles generated during the film coating process, further improving microphone performance.

[0032] As a preferred embodiment of this utility model, the rear electrode plate clamp 2 is disposed at the upper end of the support platform 1. The upper end of the support platform 1 is open and sealed to the rear electrode plate clamp 2. The rear electrode plate clamp 2 is a circular plate. The rear electrode plate fixing groove 2b is disposed at the upper end of the through hole 2a. The groove diameter of the rear electrode plate fixing groove 2b is larger than the hole diameter of the through hole 2a, so that the rear electrode plate can be fixed in the rear electrode plate fixing groove 2b. The through hole 2a is a channel for connecting the rear electrode plate fixing groove 2b and the inner cavity 1a.

[0033] As a preferred embodiment of this utility model, the support platform 1 and the rear electrode clamp 2 are in thermally conductive contact. The heating module 3 includes a ceramic heating ring 31 wound around the support platform 1. The ceramic heating ring 31 provides a high-temperature environment for the FEP coating. During heating, the support platform 1 is first heated to a preset temperature, and the rear electrode clamp 2 is heated through heat transfer between the support platform 1 and the rear electrode clamp 2. This method facilitates the arrangement of the ceramic heating ring 31 and makes the heating more uniform.

[0034] As a preferred embodiment of this utility model, the heating module 3 also includes a temperature sensor 32 for measuring the temperature of the rear electrode clamp 2. The temperature sensor 32 directly monitors the temperature of the rear electrode clamp 2 and displays it in real time on the display, which makes it easy for the operator to judge whether the temperature meets the requirements.

[0035] As a preferred embodiment of this utility model, the vacuum module 5 includes a vacuum generator 51 and a heat dissipation structure 52. The vacuum generator 51 is connected to the inner cavity 1a through the heat dissipation structure 52. The vacuum generator 51 provides a vacuum space inside the support platform to unclog the damping holes blocked after film application. Simultaneously, it provides adsorption force to the rear electrode plate and FEP film during film pressing, thus fixing them in place. Furthermore, the heat dissipation structure 52 isolates the support platform 1 from the vacuum generator 51, preventing damage to the vacuum generator 51. In this embodiment, the heat dissipation structure 52 is a heat dissipation pipe. After the gas in the inner cavity 1 passes through the heat dissipation pipe, its temperature drops to below 100°C.

[0036] As a preferred embodiment of this utility model, the distance-fixing module 4 includes a pressure plate 41 and a cylinder 42. The pressure plate 41 and the rear electrode plate clamp 2 are arranged parallel to and opposite to each other. The cylinder 42 is used to control the back-and-forth movement of the pressure plate 41 relative to the rear electrode plate clamp 2. When the pressure plate 41 approaches the rear electrode plate clamp 2, it performs a squeezing action on the rear electrode plate on the rear electrode plate clamp 2.

[0037] As a preferred embodiment of this utility model, a high-temperature resistant pressure block 43 is provided on the side of the pressure plate 41 that contacts the rear electrode clamp 2.

[0038] As a preferred embodiment of this utility model, the high-temperature resistant pressure block 43 is detachably connected to the pressure plate 41. For the use of FEP films of different thicknesses, pressure modules of different thicknesses are designed. This method makes the movement stroke of the cylinder fixed, and only the high-temperature resistant pressure block 43 needs to be replaced to achieve the coating of FEP films of different thicknesses.

[0039] As a preferred embodiment of this utility model, it also includes a bracket 6 for lifting the support platform 1 upward. The bracket 6 is a multi-column structure used to suspend the support platform 1 in the air, thereby avoiding the high temperature of the support platform 1 during operation from affecting the table below. In this embodiment, all structures are fixed on the same base to form an integral unit, which is convenient for movement.

[0040] The specific operation method of this high-efficiency electret microphone coated with FEP film is as follows:

[0041] Before laminating the film, perform the following operations: first, install the rear electrode plate into the rear electrode plate fixture, then install the entire rear electrode plate fixture into the support platform, and then place the cut FEP film on the rear electrode plate surface to cover all the rear electrode plates.

[0042] During the lamination process, the ceramic heating coil controller is turned on to heat the interior of the support platform 1 and the rear electrode clamp to 350°C, which can be monitored by the temperature sensor 32. Simultaneously, the bottom vacuum module 5 is turned on, allowing the rear electrode plate to be adsorbed onto the rear electrode clamp 2, and the FEP film to be adsorbed onto the rear electrode plate, further fixing the rear electrode plate and the FEP film. After the FEP film melts (FEP film melting point 320°C), the cylinder is activated to press down the high-temperature resistant pressure block 43, causing the FEP film to adhere to the rear electrode plate under certain pressure. The fixed-distance structure between the electrode clamp 2 and the high-temperature resistant pressure block 43 ensures a consistent thickness of the FEP film after compression. The high-temperature pressing state is maintained for ten minutes. During this time, the ceramic heating coil controller is adjusted to allow the entire fixture to slowly cool down to 150℃-200℃ in a normal environment. Then, the control cylinder retracts, and the high-temperature resistant pressure block 43 naturally separates from the FEP film. Since the FEP film is still softened at this point, the vacuum space at the bottom clears the damping holes on the rear electrode plate that were blocked by the FEP, meeting the specifications. Finally, the ceramic heating coil is turned off, and the rear electrode plate can be removed after the entire fixture has naturally cooled to room temperature, completing the entire film application process.

[0043] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A device for coating a high-efficiency electret microphone with an FEP film, characterized in that: The application relates to a rear pole plate fixing device, which comprises a support table, a rear pole plate clamp, a heating module, a distance fixing module and a vacuum module, wherein an inner cavity is arranged in the support table, the rear pole plate clamp is arranged on the support table, at least one through hole and a rear pole plate fixing groove are combined on the rear pole plate clamp, the through hole and the vacuum module are connected with the inner cavity, and the distance fixing module is used for extruding a rear pole plate fixed on the rear pole plate clamp.

2. The device for coating FEP film on electret microphone according to claim 1, wherein: The rear pole plate clamp is arranged at the upper end of the support table, and the rear pole plate fixing groove is arranged at the upper end of the through hole.

3. The device for coating FEP film on electret microphone according to claim 1, wherein: The support table and the rear pole plate clamp are in heat-conducting contact, and the heating module comprises a ceramic heating ring wound on the support table.

4. The device for coating FEP film on an electret microphone according to claim 3, characterized in that: The heating module further comprises a temperature sensor for measuring the temperature of the rear pole plate clamp.

5. The device for coating FEP film on an electret microphone according to claim 1, wherein: The vacuum module comprises a vacuum generator and a heat dissipation structure, and the vacuum generator is connected with the inner cavity through the heat dissipation structure.

6. A device for efficiently coating FEP film for electret microphone according to any one of claims 1-5, characterized in that: The distance fixing module comprises a pressing plate and a gas cylinder, and the gas cylinder is used for controlling the back-and-forth movement of the pressing plate relative to the rear pole plate clamp.

7. The device for coating FEP film on an electret microphone according to claim 6, wherein: One side of the pressing plate in contact with the rear pole plate clamp is provided with a high-temperature-resistant pressing block.

8. A device for efficiently coating FEP film for electret microphone according to any one of claims 1-5, characterized in that: The application further comprises a support for lifting the support table upward.

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