A dome diaphragm and a loudspeaker

Abstract

The application relates to a dome diaphragm and a loudspeaker, the dome diaphragm comprising a first hard layer, a first epoxy foam film layer and a second hard layer which are sequentially stacked, wherein the first epoxy foam film layer is bonded to the first hard layer and the second hard layer respectively. By replacing the foam film layer in the dome diaphragm in the prior art with the first epoxy foam film layer, the first epoxy foam film layer is bonded to the first hard layer and the second hard layer, the risk of delamination of the dome diaphragm is reduced, and the overall stability and sound quality performance of the dome diaphragm when applied to the loudspeaker are improved.

Description

Technical Field

[0001] This application relates to the field of dome diaphragm technology, and more particularly to a dome diaphragm and a loudspeaker. Background Technology

[0002] Loudspeakers are crucial components in audio systems, responsible for converting electrical signals into sound waves to generate sound. They are widely used in home audio, car audio, headphones, and cinema systems, forming the foundation for reproducing high-quality audio experiences. The core working principle of a loudspeaker relies on the interaction between a magnetic field and vibration: the voice coil moves under the drive of an electric current, pushing the diaphragm to vibrate in the air, thereby generating sound waves. The diaphragm, as the "sound-producing surface," directly determines the clarity and realism of the sound.

[0003] In loudspeaker design, there are various types of diaphragms. Among them, the dome diaphragm is a common form designed specifically for tweeters, offering precise high-frequency response due to its compact and lightweight characteristics. Compared to other diaphragm shapes, the dome design better controls sound wave diffusion and reduces breakup vibration, effectively improving sound fidelity and transient response. The choice of dome diaphragm is particularly crucial.

[0004] Traditional dome diaphragms are typically formed by stacking a rigid layer (such as aluminum foil) and a foam film layer; the foam film layer is, for example, a PMI (Polymethacrylimide) foam film layer. The foam film layer provides a certain degree of elasticity and sound radiation, allowing the dome to transmit sound more effectively when vibrating.

[0005] However, the applicant of this application discovered that the adhesive strength between the rigid layer and the foam film layer is insufficient, which makes it easy for delamination to occur during use, affecting sound quality and speaker stability. Utility Model Content

[0006] In view of the above problems, embodiments of this application provide a dome diaphragm and a loudspeaker that overcome or at least partially solve the above problems.

[0007] According to one aspect of the embodiments of this application, a dome diaphragm is provided, comprising a first rigid layer, a first epoxy foam film layer and a second rigid layer stacked sequentially, wherein the first epoxy foam film layer is bonded to the first rigid layer and the second rigid layer respectively.

[0008] In one alternative embodiment, the dome diaphragm further includes a fiber cloth and a second epoxy foam film layer, wherein the first rigid layer, the first epoxy foam film layer, the fiber cloth, the second epoxy foam film layer and the second rigid layer are stacked sequentially; the first epoxy foam film layer is bonded to the first rigid layer and the fiber cloth respectively, and the second epoxy foam film layer is bonded to the second rigid layer and the fiber cloth respectively.

[0009] In one alternative embodiment, the fiber cloth is any one of glass fiber cloth, biaxial carbon fiber cloth, or ceramic fiber cloth.

[0010] In one alternative embodiment, the thickness of the fiber cloth is 10 μm to 30 μm.

[0011] In one alternative embodiment, the thickness of the first epoxy foam film layer is 10 μm to 30 μm, and / or the thickness of the second epoxy foam film layer is 10 μm to 30 μm.

[0012] In one alternative embodiment, the first rigid layer is aluminum foil or an aluminum-magnesium alloy, and / or the second rigid layer is aluminum foil or an aluminum-magnesium alloy.

[0013] In one alternative, the thickness of the first hard layer is 5 μm to 20 μm, and / or the thickness of the second hard layer is 5 μm to 20 μm.

[0014] In one alternative embodiment, the thickness of the dome diaphragm is from 50 μm to 200 μm.

[0015] According to one aspect of the embodiments of this application, a loudspeaker is provided, including the aforementioned dome diaphragm.

[0016] The beneficial effects of this application embodiment are as follows: A dome diaphragm is provided, comprising a first rigid layer, a first epoxy foam film layer, and a second rigid layer stacked sequentially, wherein the first epoxy foam film layer is bonded to both the first rigid layer and the second rigid layer. By using the first epoxy foam film layer to replace the foam film layer in existing dome diaphragms, the bonding between the first epoxy foam film layer and the first and second rigid layers effectively improves the bonding strength and durability between the various layers of the dome diaphragm, reduces delamination caused by vibration, and enhances the sound quality output and long-term reliability of the dome diaphragm when applied to a loudspeaker. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a schematic diagram of one implementation of the dome diaphragm provided in the embodiments of this application.

[0019] Figure 2 This is a schematic diagram of another implementation of the dome diaphragm provided in the embodiments of this application.

[0020] The labels in the attached diagram are as follows:

[0021] 100. Dome diaphragm;

[0022] 10. First rigid layer; 20. First epoxy foam film layer; 30. Second rigid layer; 40. Fiber cloth; 50. Second epoxy foam film layer. Detailed Implementation

[0023] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0025] Please see Figure 1 This application provides a dome diaphragm 100, comprising a first rigid layer 10, a first epoxy foam film layer 20, and a second rigid layer 30 stacked sequentially, wherein the first epoxy foam film layer 20 is bonded to both the first rigid layer 10 and the second rigid layer 30. By introducing the first epoxy foam film layer 20 to replace the foam film layer in a conventional dome diaphragm 100, the bonding between the first epoxy foam film layer 20 and the first rigid layer 10 and the second rigid layer 30 is effectively enhanced, thereby improving the bonding strength and durability between the layers of the dome diaphragm 100. This structure significantly reduces the risk of delamination caused by vibration, thereby improving the sound quality output and long-term reliability of the dome diaphragm 100 when applied to a loudspeaker.

[0026] It is worth noting that in the fabrication of the dome diaphragm 100, the first rigid layer 10, the epoxy foam film, and the second rigid layer 30 are stacked sequentially. Then, foaming and bonding are performed under specific temperature and pressure conditions. On one hand, foaming increases the thickness of the dome diaphragm 100, reducing its weight; on the other hand, bonding ensures a tight bond between the layers. After foaming and bonding, the first rigid layer 10, the first epoxy foam film layer 20, and the second rigid layer 30 are formed in sequence. The temperature and pressure parameters during foaming and bonding must be precisely controlled to ensure the uniformity of the epoxy foam and the bonding strength, thereby further improving the overall performance and stability of the dome diaphragm 100. For example, the temperature during foaming and bonding can be set to 170℃ to 190℃, and the pressure controlled between 1MPa and 10MPa. In this embodiment, the first epoxy foam film layer 20, formed by integral molding of foaming and epoxy bonding, not only simplifies the manufacturing process but also eliminates the need for an additional adhesive layer, thereby saving raw materials and reducing production costs. A high-strength, lightweight dome diaphragm 100 can be obtained with lower production costs.

[0027] The epoxy foam film forming the first epoxy foam film layer 20 is prepared by coating process using the raw materials and formulation of epoxy foam film in the prior art. For example, the raw materials and formulation of epoxy foam film are in accordance with the technical solution disclosed in patent CN112662357 B.

[0028] The curing temperature of the epoxy foam film forming the first epoxy foam film layer 20 is 160°C to 180°C, and the foaming temperature is 150°C to 160°C. Therefore, the temperature for foaming and bonding is set to 170°C to 190°C.

[0029] It is worth noting that the epoxy resin in the epoxy foam film forming the first epoxy foam film layer 20, after curing, not only has excellent resistance to acids, alkalis, and solvents, but also has excellent weather resistance and water vapor resistance. It will not change after long-term use and its performance is very stable.

[0030] It is worth noting that after foaming and bonding, the epoxy foam film forms a first epoxy foam film layer 20, and the adhesive strength of the first epoxy foam film layer 20 is 3500gf / inch to 4500gf / inch.

[0031] It is worth noting that in some embodiments, please refer to [link / reference]. Figure 2The dome diaphragm 100 further includes a fiber cloth 40 and a second epoxy foam film layer 50. The first rigid layer 10, the first epoxy foam film layer 20, the fiber cloth 40, the second epoxy foam film layer 50, and the second rigid layer 30 are stacked sequentially. The first epoxy foam film layer 20 is bonded to the first rigid layer 10 and the fiber cloth 40, and the second epoxy foam film layer 50 is bonded to the second rigid layer 30 and the fiber cloth 40. The fiber cloth 40 provides support and reinforcement, allowing the dome diaphragm 100 to absorb energy during vibration and mitigating the risk of breakage of the first rigid layer 10 and / or the second rigid layer 30. Furthermore, the addition of the fiber cloth 40 effectively improves the diaphragm's flexibility and impact resistance, further extending the speaker's lifespan.

[0032] It is worth noting that in some embodiments, when preparing the dome diaphragm 100, the first rigid layer 10, epoxy foam film, fiber cloth 40, epoxy foam film, and second rigid layer 30 are stacked sequentially. Then, foaming and bonding are performed under specific temperature and pressure. On the one hand, foaming increases the thickness of the dome diaphragm 100 and reduces its weight; on the other hand, bonding ensures a tight bond between the layers. After foaming and bonding, the first rigid layer 10, the first epoxy foam film layer 20, the fiber cloth 40, the second epoxy foam film layer 50, and the second rigid layer 30 are formed in sequence. The temperature and pressure parameters during foaming and bonding need to be precisely controlled to ensure the uniformity of the epoxy foam and the bonding strength, thereby further improving the overall performance and stability of the dome diaphragm 100. For example, the temperature during foaming and bonding can be set to 170°C to 190°C, and the pressure controlled to 1 MPa to 10 MPa. In this embodiment, the first epoxy foam film layer 20 and the second epoxy foam film layer 50, integrally formed by foaming and epoxy bonding, not only simplify the manufacturing process but also eliminate the need for additional adhesive layers, thereby saving raw materials and reducing production costs. A high-strength, lightweight dome diaphragm 100 can be obtained with lower production costs. Furthermore, the addition of fiber cloth 40 as a reinforcing layer fully leverages the material's advantages, integrating excellent mechanical and acoustic properties, significantly improving the speaker's sound quality and durability.

[0033] The epoxy foam film forming the first epoxy foam film layer 20 or the second epoxy foam film layer 50 is prepared by coating process using the raw materials and formulation of epoxy foam film in the prior art. For example, the raw materials and formulation of epoxy foam film are in accordance with the technical solution disclosed in patent CN 112662357 B.

[0034] It is worth noting that the epoxy foam film forming the first epoxy foam film layer 20 and the epoxy foam film forming the second epoxy foam film layer 50 can be made of the same or different materials.

[0035] The curing temperature of the epoxy foam film forming the first epoxy foam film layer 20 or the second epoxy foam film layer 50 is 160°C to 180°C, and the foaming temperature is 150°C to 160°C. Therefore, the temperature for foaming and bonding is set to 170°C to 190°C.

[0036] It is worth noting that the epoxy resin in the epoxy foam film forming the first epoxy foam film layer 20 or the second epoxy foam film layer 50, after curing, not only has excellent resistance to acids, alkalis, and solvents, but also has excellent weather resistance and water vapor resistance. It will not change after long-term use and its performance is very stable.

[0037] It is worth noting that after foaming and bonding, the epoxy foam film forms a first epoxy foam film layer 20 or a second epoxy foam film layer 50, and the bonding force of the first epoxy foam film layer 20 or the second epoxy foam film layer 50 is 3500gf / inch to 4500gf / inch.

[0038] In some embodiments, the fiber cloth 40 is any one of glass fiber cloth (which may be woven glass fiber yarn cloth), biaxial carbon fiber cloth, or ceramic fiber cloth.

[0039] In some embodiments, the thickness of the fiber cloth 40 is 10 μm to 30 μm.

[0040] In some embodiments, the thickness of the first epoxy foam film layer 20 is 10 μm to 30 μm, and / or the thickness of the second epoxy foam film layer 50 is 10 μm to 30 μm. This design can effectively improve the mechanical strength and durability of the dome diaphragm 100 while maintaining its lightweight characteristics and ensuring its stable performance under high load conditions.

[0041] In some embodiments, the first rigid layer 10 is aluminum foil or an aluminum-magnesium alloy, and / or the second rigid layer 30 is aluminum foil or an aluminum-magnesium alloy. The aluminum foil or aluminum-magnesium alloy has good conductivity and ductility, and is lightweight, which helps to reduce the weight of the speaker.

[0042] It is worth noting that the first hard layer 10 and the second hard layer 30 may be made of the same or different materials.

[0043] It is worth noting that in some embodiments, the thickness of the first hard layer 10 is 5 μm to 20 μm, and / or the thickness of the second hard layer 30 is 5 μm to 20 μm.

[0044] It is worth noting that in some embodiments, the thickness of the dome diaphragm 100 is 50 μm to 200 μm. This design optimizes the acoustic performance and mechanical stability of the dome diaphragm 100, ensuring excellent performance in high-frequency response and low distortion.

[0045] This application also provides an embodiment of a loudspeaker, which includes the dome diaphragm 100. The specific structure and function of the dome diaphragm 100 can be found in the above embodiments, and will not be repeated here.

[0046] It should be noted that while preferred embodiments of this application are provided in the specification and accompanying drawings, this application can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this application; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this application. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this application's specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A dome diaphragm, characterized in that, include: A first rigid layer, a first epoxy foam film layer, and a second rigid layer are stacked sequentially, wherein the first epoxy foam film layer bonds the first rigid layer and the second rigid layer respectively.

2. The dome diaphragm according to claim 1, characterized in that, The dome diaphragm further includes a fiber cloth and a second epoxy foam film layer. The first rigid layer, the first epoxy foam film layer, the fiber cloth, the second epoxy foam film layer and the second rigid layer are stacked in sequence. The first epoxy foam film layer is bonded to the first rigid layer and the fiber cloth, and the second epoxy foam film layer is bonded to the second rigid layer and the fiber cloth.

3. The dome diaphragm according to claim 2, characterized in that, The fiber cloth is any one of glass fiber cloth, biaxial carbon fiber cloth, or ceramic fiber cloth.

4. The dome diaphragm according to claim 2, characterized in that, The thickness of the fiber cloth is 10 μm to 30 μm.

5. The dome diaphragm according to claim 2, characterized in that, The thickness of the first epoxy foam film layer is 10 μm to 30 μm, and / or the thickness of the second epoxy foam film layer is 10 μm to 30 μm.

6. The dome diaphragm according to claim 1 or 2, characterized in that, The first hard layer is aluminum foil or aluminum-magnesium alloy, and / or the second hard layer is aluminum foil or aluminum-magnesium alloy.

7. The dome diaphragm according to claim 1 or 2, characterized in that, The thickness of the first hard layer is 5 μm to 20 μm, and / or the thickness of the second hard layer is 5 μm to 20 μm.

8. The dome diaphragm according to claim 1 or 2, characterized in that, The thickness of the dome diaphragm is 50 μm to 200 μm.

9. A loudspeaker, characterized in that, Including the dome diaphragm as described in any one of claims 1-8.

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