Vibrating diaphragm

Abstract

The utility model provides a vibrating diaphragm, which belongs to the technical field of vibrating diaphragms, and comprises at least one bonding layer, at least one side of each bonding layer is provided with a conductive layer, the connecting surface of the conductive layer and the bonding layer is a roughening treatment surface or a surface activation treatment surface, and the bonding layer and the conductive layer are in hot-pressing composite connection or bonding connection. According to the utility model, the bonding layer and the conductive layer are directly compounded, so that the requirement of bonding strength is met, the process is simplified, the problem of insufficient thickness of a magnetron sputtering coating can be effectively solved, and the negative influence of a glue bonding process on the compliance of the vibrating diaphragm can be avoided; therefore, the light weight of the planar diaphragm structure, the high sensitivity of the performance and the simplification of the manufacturing process are realized.

Description

Technical Field

[0001] This utility model relates to a diaphragm. Background Technology

[0002] Planar diaphragm loudspeakers are widely used in the field of high-fidelity loudspeakers due to their wider frequency response, lower distortion, and higher transient response.

[0003] However, current planar diaphragm manufacturing technology faces several bottlenecks. For example, magnetron sputtering is often used to manufacture the conductive layer of the diaphragm, but the high temperature inside the magnetron sputtering equipment has a significant impact on the thin film substrate. Therefore, to prevent problems such as burns and wrinkles on the thin film, the thickness of the sputtered conductive metal layer is very thin, making it difficult to meet the ideal circuit design thickness requirements. This results in a lower sensitivity design value for planar diaphragm loudspeakers, which must rely on a dedicated power amplifier to meet usage requirements. Furthermore, magnetron sputtering coating also has several other drawbacks, such as high equipment costs, slow diaphragm preparation speed, and low utilization rate of metal targets, leading to high diaphragm manufacturing costs.

[0004] In addition, traditional processes typically involve spin-coating metal foil with adhesive or attaching it to a thin film using double-sided tape to increase the thickness of the conductive layer. However, this method, due to the use of adhesive or double-sided tape and the cumbersome operation process, has an adverse effect on the quality, compliance, and performance consistency of the diaphragm, thereby affecting the sound quality of the speaker. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the above-mentioned traditional technologies and provide a diaphragm.

[0006] The purpose of this utility model is achieved through the following technical measures: a diaphragm, characterized in that: it includes at least one adhesive layer, each adhesive layer has a conductive layer on at least one side, the surface where the conductive layer is connected to the adhesive layer is a roughened surface or a surface activated surface, the adhesive layer and the conductive layer are thermo-pressed composite connection or adhesive connection, and the adhesive layer is a thermoplastic polyurethane layer.

[0007] As an improvement, the surface activation treatment surface is either a surface activation area coated with a silane coupling agent or a surface activation area treated with plasma.

[0008] As a further improvement, the ratio of the thickness of the conductive layer to the thickness of the adhesive layer is less than or equal to 5 times.

[0009] As a further improvement, a core reinforcing layer is also included, which is located on one side of the adhesive layer. The core reinforcing layer is a polyethylene terephthalate layer, a polyphenylene sulfide layer, a polyimide layer, a polyether ether ketone layer, a polyethylene naphthalate layer, or a polyetherimide layer. The thickness of the core reinforcing layer is less than or equal to 5 times the thickness of the adhesive layer.

[0010] As a further improvement, the adhesive layer is included, with one side of the adhesive layer being the conductive layer and the other side of the adhesive layer being the core reinforcement layer.

[0011] As a further improvement, it includes two adhesive layers, with the core reinforcing layer between the two adhesive layers, and the conductive layer on the side of each adhesive layer away from the core reinforcing layer.

[0012] As a further improvement, the adhesive layer includes two layers, one of which is connected to the other adhesive layer, and the outer sides of both adhesive layers are the conductive layer.

[0013] As a further improvement, the adhesive layer is included, with the conductive layer on both sides of the adhesive layer.

[0014] As a further improvement, the thickness of the adhesive layer is 1-25 μm.

[0015] As a further improvement, the conductive layer is a metal foil layer, which may be an aluminum foil layer, a copper foil layer, a silver foil layer, or a gold foil layer.

[0016] Due to the adoption of the above technical solution, the advantages of this utility model compared with the prior art are:

[0017] First: This utility model allows for free switching between single-sided and double-sided circuit designs.

[0018] Second: The conductive layer has a controllable thickness and excellent electrical performance, which solves the problem of low speaker sensitivity and difficulty in driving caused by insufficient magnetron sputtering coating thickness;

[0019] Third: The adhesive layer replaces traditional glue, avoiding the problems of decreased diaphragm compliance and increased mass caused by glue hardening, and ensuring the diaphragm's flexibility, lightweight, and consistency.

[0020] Fourth: The core reinforcing layer enhances the overall mechanical strength and fatigue resistance of this utility model, while maintaining its lightweight characteristics;

[0021] Fifth: The conductive layer, the adhesive layer, and the core reinforcing layer can be selected according to actual needs, and different structural modes can be used to meet the requirements of different speakers in terms of performance, weight, cost, and other aspects.

[0022] In summary, this invention, through the direct composite of the adhesive layer and the conductive layer, not only satisfies the requirements for bonding strength but also simplifies the process. It effectively solves the problem of insufficient thickness in magnetron sputtering coating and avoids the negative impact of adhesive bonding on diaphragm compliance. Thus, it achieves lightweight planar diaphragm structure, high performance sensitivity, and simplified manufacturing process.

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Appendix Figure 1 This is a structural schematic diagram of Embodiment 1;

[0025] Appendix Figure 2 This is a structural schematic diagram of Embodiment 2;

[0026] Appendix Figure 3 This is a structural schematic diagram of Embodiment 3;

[0027] Appendix Figure 4 This is a schematic diagram of the structure of Embodiment 4. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component 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 utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] Example 1: A diaphragm includes an adhesive layer 1, one side of which is the conductive layer 2, and the other side of which is the core reinforcing layer 3.

[0033] The adhesive layer 1 is a thermoplastic polyurethane layer, i.e., a TPU layer. The thickness of the adhesive layer 1 is 1-50 μm. The adhesive layer 1 is not limited to a TPU layer and can be other viscous elastomers. The TPU can be a solvent-based TPU adhesive, a hot melt TPU adhesive, a water-based TPU adhesive, or a TPU film, etc. At the same time, tackifiers or crosslinking agents can be added to each type of TPU to improve the adhesion and meet the needs of different products.

[0034] The conductive layer 2 is a metal foil layer with a thickness of 1-50 μm. The metal foil layer is made of conductive materials such as aluminum foil, copper foil, silver foil, or gold foil.

[0035] The core reinforcing layer 3 is a polyethylene terephthalate layer, a polyphenylene sulfide layer, a polyimide layer, a polyetheretherketone layer, a polyethylene naphthalate layer, or a polyetherimide layer (PET layer, PPS layer, PI layer, PEEK layer, PEN layer, or PEI layer), with a thickness selectable from 0.5µm to 15µm. It features ultra-thinness, high strength, and lightweight properties. The core reinforcing layer 3 provides the composite film with mechanical strength and stability, and suitable materials can be selected based on mechanical and acoustic properties.

[0036] This structure is simple and lightweight, and can withstand long-term vibration and temperature changes during operation. It has excellent fatigue resistance and durability, and is suitable for speaker designs that have high requirements for high frequency response.

[0037] Example 2: A diaphragm comprising two adhesive layers 1, with a core reinforcing layer 3 between the two adhesive layers 1, and conductive layers 2 on the side of each adhesive layer 1 away from the core reinforcing layer 3. The adhesive layer 1 is a thermoplastic polyurethane layer, i.e., a TPU layer, with a thickness of 1-50 μm. The adhesive layer 1 is not limited to TPU and can be other viscous elastomers. The TPU can be solvent-based TPU adhesive, hot-melt TPU adhesive, water-based TPU adhesive, or TPU film, etc. Tackifiers or crosslinking agents may be added to various types of TPU to improve adhesion and meet the needs of different products.

[0038] The conductive layer 2 is a metal foil layer with a thickness of 1-50 μm. The metal foil layer is made of conductive materials such as aluminum foil, copper foil, silver foil, or gold foil.

[0039] The core reinforcing layer 3 is a polyethylene terephthalate layer, a polyphenylene sulfide layer, a polyimide layer, a polyetheretherketone layer, a polyethylene naphthalate layer, or a polyetherimide layer (PET layer, PPS layer, PI layer, PEEK layer, PEN layer, or PEI layer), with a thickness selectable from 0.5um to 15um. The core reinforcing layer 3 provides mechanical strength and stability to the composite membrane, and suitable materials can be selected according to mechanical and acoustic properties.

[0040] This double-sided circuit design offers superior mechanical balance and vibration stability, along with longer circuitry to meet the high sensitivity requirements of products, making it suitable for high-power, high-sensitivity loudspeakers.

[0041] Example 3: A diaphragm includes two adhesive layers 1, wherein the adhesive layer 1 is connected to another adhesive layer 1, and the outer sides of both adhesive layers 1 are the conductive layers 2.

[0042] The adhesive layer 1 is a thermoplastic polyurethane layer, i.e., a TPU layer. The thickness of the adhesive layer 1 is 1-50 μm. The adhesive layer 1 is not limited to a TPU layer and can be other viscous elastomers. The TPU can be a solvent-based TPU adhesive, a hot melt TPU adhesive, a water-based TPU adhesive, or a TPU film, etc. At the same time, tackifiers or crosslinking agents can be added to each type of TPU to improve the adhesion and meet the needs of different products.

[0043] The conductive layer 2 is a metal foil layer with a thickness of 1-50 μm. The metal foil layer is made of conductive materials such as aluminum foil, copper foil, silver foil, or gold foil.

[0044] This structure provides high compliance, making it suitable for speaker applications that enhance low frequencies.

[0045] Example 4: A diaphragm, comprising an adhesive layer 1, wherein both sides of the adhesive layer 1 are the conductive layers 2.

[0046] The adhesive layer 1 is a thermoplastic polyurethane layer, i.e., a TPU layer. The thickness of the adhesive layer 1 is 1-50 μm. The adhesive layer 1 is not limited to a TPU layer and can be other viscous elastomers. The TPU can be a solvent-based TPU adhesive, a hot melt TPU adhesive, a water-based TPU adhesive, or a TPU film, etc. At the same time, tackifiers or crosslinking agents can be added to each type of TPU to improve the adhesion and meet the needs of different products.

[0047] The conductive layer 2 is a metal foil layer with a thickness of 1-50 μm. The metal foil layer is made of conductive materials such as aluminum foil, copper foil, silver foil, or gold foil.

[0048] This structure provides high compliance, making it suitable for speaker applications that enhance low frequencies.

[0049] In Examples 1 to 4, the ratio of the thickness of the conductive layer 2 to the thickness of the adhesive layer 1 is less than or equal to 5 times, and the ratio of the thickness of the core reinforcing layer 3 to the thickness of the adhesive layer 1 is less than or equal to 5 times.

[0050] This novel invention is manufactured through the following steps:

[0051] Step 1: First, clean the surface of the metal foil layer by wiping the aluminum foil surface with a lint-free cloth soaked in acetone to remove grease and oxides;

[0052] Step 2: Roughen or activate the surface of the metal foil layer to prevent bonding interface failure.

[0053] Step 3: Heat the TPU to a molten state (approximately 120-200°C) using a heating device. Optionally, an tackifier can be added to enhance adhesion. The liquid TPU is then evenly coated onto the surface of the metal foil layer using a coating process. The metal foil layer and the TPU layer are then pressed together using hot pressing, heat curing, or room temperature curing. Alternatively, the metal foil layer and the TPU layer are placed in a stacked order and hot-pressed together using a roller press. Hot pressing parameters: temperature: 100-200°C, pressure: 0.1-2MPa. Alternatively, a solvent-based TPU adhesive can be used. Optionally, an tackifier can be added to enhance adhesion. The solvent-based TPU adhesive is then applied to the surface of the metal foil layer and dried with hot air at 60-100°C for 3-30 minutes. Optionally, a secondary curing process is performed in an oven at 60-100°C for 3-30 minutes.

[0054] Step 4: Clean the core reinforcement layer by using an ion air gun to blow away the dust attracted by electrostatic charge.

[0055] Step 5: Place the core reinforcing layer in the appropriate position according to the stacking order, and then hot press composite it by a roller press; Hot pressing parameters: temperature: 100-200°C, pressure: 0.1-2MPa.

[0056] In the above steps:

[0057] Surface roughening treatment includes:

[0058] Mechanical polishing: Use sandpaper or sandblasting to increase surface roughness (Ra value can be controlled between 0.5-2μm);

[0059] Alternatively, chemical etching (for aluminum foil layers): use a NaOH solution (5%-10%) to lightly etch the surface, forming a microporous structure.

[0060] Surface activation treatment includes:

[0061] Plasma treatment: By treating with low-temperature plasma (oxygen or argon), polar groups (-OH, -COOH) are introduced to enhance surface energy;

[0062] Alternatively, a primer can be applied: a silane coupling agent (such as KH-550 or KH-560) is applied to enhance the chemical bonding between TPU and metal; the silane coupling agent is a 1%-3% silane coupling agent ethanol solution, and then dried at 80°C for 5 minutes.

[0063] The structure of this invention can be widely used in: planar loudspeakers, planar diaphragm headphones, high-fidelity audio systems, and portable loudspeaker units in consumer electronics.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A diaphragm characterized by: The adhesive layer is thermoplastic polyurethane layer.

2. A diaphragm according to claim 1, wherein: The surface activation treatment surface is the surface activation treatment surface by coating silane coupling agent or the surface activation treatment surface by plasma treatment.

3. A diaphragm according to claim 2, wherein: The ratio of the thickness of the conductive layer to the thickness of the adhesive layer is less than or equal to 5 times.

4. The diaphragm of any one of claims 1-3, wherein: The core reinforcing layer is polyethylene terephthalate layer or polyphenylene sulfide layer or polyimide layer or polyether ether ketone layer or polyethylene naphthalate layer or polyetherimide layer.

5. A diaphragm according to claim 4, wherein: The adhesive layer is connected to another adhesive layer, and the outer sides of the two adhesive layers are the conductive layer.

6. A diaphragm according to claim 4, wherein: The thickness of the adhesive layer is 1-25um.

7. The vibrating diaphragm of claim 3 wherein: The conductive layer is metal foil layer, and the metal foil layer is aluminum foil layer, copper foil layer, silver foil layer or gold foil layer.

8. The vibrating diaphragm of claim 3 wherein: ​ 9. The vibrating diaphragm of claim 1 wherein: ​ 10. The vibrating diaphragm of claim 1, wherein: ​

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