Earphone rear cavity waterproof structure

Abstract

The utility model discloses a kind of earphone back cavity waterproof structure, it includes earphone cavity, waterproof net and waterproof sheet, and it is equipped with tuning hole on earphone cavity, the position of the inner wall of earphone cavity corresponding tuning hole is equipped with circular cylinder, waterproof net is located in the circular cylinder, and waterproof sheet is enclosed in the end of the circular cylinder.The utility model structure design is reasonable, cleverly add circular cylinder on tuning hole, so that tuning hole is lengthened and sealed treatment is carried out using waterproof sheet to change the direction of tuning hole, when water enters from tuning hole, it is blocked by waterproof net, most kinetic energy is attenuated, if still a small amount of water penetrates, temporarily store in circular cylinder;Water into circular cylinder forms water film or water bolt in cylinder due to surface tension, forms physical structure water resistance, to realize waterproof purpose;And when waterproof fails, due to air hole is far away from PCBA in earphone cavity, so that water outflow direction and PCBA space are dislocated, avoid direct impact, and waterproof effect is good.

Description

Technical Field

[0001] This utility model relates to the field of headphone technology, specifically to a waterproof structure for the rear cavity of a headphone. Background Technology

[0002] With the rapid popularization of Bluetooth headsets, users have placed higher demands on their reliability in everyday water-related scenarios (sweat during exercise, rain splashes, and even short-term immersion). Most Bluetooth headsets on the market have a direct-through tuning port on the rear cavity, using a waterproof mesh to achieve both acoustic pressure relief and waterproofing. However, while this traditional structure achieves a certain degree of waterproofing, the direct-through tuning port is directly facing the electronic components inside the rear cavity, such as the PCBA or battery. When subjected to sudden water pressure or a large water droplet impact, water can easily penetrate the waterproof mesh and splash directly onto the PCBA, potentially causing a short circuit, burning out components, and rendering the headset malfunction. Utility Model Content

[0003] To address the aforementioned shortcomings, the purpose of this utility model is to provide a waterproof structure for the rear cavity of an earphone with a reasonable structural design and good waterproof performance.

[0004] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0005] A waterproof structure for the rear cavity of an earphone includes an earphone cavity and a tuning hole, a waterproof mesh, and a waterproof sheet disposed on the earphone cavity. A circular cylinder is provided on the inner wall of the earphone cavity corresponding to the position of the tuning hole. The circular cylinder is connected to the tuning hole. The waterproof mesh is located inside the circular cylinder. The waterproof sheet is closed at the end of the circular cylinder. A vent hole is provided on the cylindrical wall of the circular cylinder away from the electronic components located inside the earphone cavity.

[0006] In a preferred embodiment of this invention, there is a gap between the waterproof mesh and the waterproof sheet. The gap can temporarily store water, using the surface tension of the water to form a water film or condensation, which temporarily blocks subsequent water droplets. Moreover, after passing through the waterproof mesh, the water droplets need to travel a certain distance before reaching the waterproof sheet, further reducing their kinetic energy and thus improving the waterproof effect.

[0007] As a preferred embodiment of this utility model, a step is provided in the middle of the cylindrical body, and the edge of the waterproof mesh is attached to the step with adhesive backing to achieve axial positioning. The installation and assembly process is simple and has a high yield.

[0008] As a preferred embodiment of this utility model, the volume of the circular cylinder is ≥ 3 times the volume of the sphere calculated from the permeable area radius of the waterproof mesh, which can better utilize the surface tension of water to form a stable water film or water plug, thereby achieving physical waterproofing.

[0009] As a preferred embodiment of this utility model, the vent is located at the end of the cylindrical wall of the cylindrical body, which ensures acoustic ventilation while reducing the possibility of water splashing onto the PCBA.

[0010] As a preferred embodiment of this utility model, the waterproof mesh is a nylon mesh, which has both breathability and waterproof properties.

[0011] As a preferred embodiment of this utility model, the waterproof sheet is a PET sheet, PP sheet, PC sheet or PI sheet, which is impermeable to water and has a good waterproof effect.

[0012] The beneficial effects of this utility model are as follows: The structure of this utility model is reasonably designed. A circular cylinder is cleverly added to the tuning hole, which elongates the tuning hole and uses a waterproof sheet for sealing, thereby changing the direction of the tuning hole. When water enters from the tuning hole, it is blocked by the waterproof mesh, and most of its kinetic energy is attenuated. If a small amount of water still penetrates, it is temporarily stored in the circular cylinder. The water entering the circular cylinder forms a water film or water plug inside the cylinder due to surface tension, forming a physical structure that resists water, thereby achieving the purpose of waterproofing. Moreover, when the waterproofing fails, because the vent is far away from the PCBA inside the earphone cavity, the direction of water flow is misaligned with the PCBA space, avoiding direct impact and achieving good waterproofing effect.

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 1 .

[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of this utility model. Figure 2 .

[0016] Figure 3 This is an exploded structural diagram of the present invention.

[0017] Figure 4 This is a schematic diagram of the structure of this utility model in use.

[0018] Figure 5 This is a schematic diagram of the waterproof mesh structure in this utility model. Detailed Implementation

[0019] See Figures 1 to 4 This embodiment provides a waterproof structure for the rear cavity of an earphone, which includes an earphone cavity 1, a waterproof mesh 2, and a waterproof sheet 3. The earphone cavity 1 is provided with a tuning hole 11.

[0020] In this embodiment, the waterproof mesh 2 is preferably a nylon mesh with a thickness of 0.15mm, which combines breathability and waterproofness. The waterproof sheet 3 is preferably a PET sheet, which is low in cost and has high chemical stability. In other embodiments, the waterproof sheet 3 can also be a PP sheet, PC sheet, or PI sheet.

[0021] A circular cylindrical body 4 is provided on the inner wall of the earphone cavity 1 at the position corresponding to the tuning hole 11. The circular cylindrical body 4 is connected to the tuning hole 11. Preferably, the circular cylindrical body 4 and the earphone cavity 1 are integrally formed, i.e., integrally injection molded. Of course, adhesive bonding can also be used for fixing and connecting.

[0022] The waterproof mesh 2 is located inside the cylindrical body 4. Specifically, a step 41 is provided in the middle of the cylindrical body 4. The edge of the waterproof mesh 2 is attached to the step 41 with adhesive backing to achieve axial positioning. The installation and assembly process is simple and has a high yield.

[0023] The waterproof sheet 3 is sealed at the end of the cylindrical body 4 by adhesive backing. A certain gap exists between the waterproof mesh 2 and the waterproof sheet 3. This gap allows for temporary water storage, utilizing the surface tension of water to form a water film or condensation, temporarily blocking subsequent water droplets. Furthermore, water droplets need to travel a further distance after passing through the waterproof mesh 2 before reaching the waterproof sheet 3, further reducing their kinetic energy and thus improving the waterproofing effect. The distance is the height of the cylindrical body 4. Preferably, the volume of the cylindrical body 4 is greater than or equal to the volume of a sphere calculated using three times the permeable area radius of the waterproof mesh. This is because water forms droplets, roughly spherical, when it permeates the waterproof mesh, so the volume of a sphere is calculated using the formula for sphere volume. Specifically, because the edges of the waterproof mesh 2 are adhered with adhesive backing 21, the edges are not breathable; only the middle of the waterproof mesh 2 is breathable. The diameter d of the breathable middle section 22 of the waterproof mesh 2 is taken as... Let's illustrate with examples.

[0024] Using the formula for the volume of a sphere, V = 4 / 3 × π × r 3 Calculate: 4 / 3 × π × (1.9 / 2) 3 The volume of the sphere is calculated to be 0.00359 cm³. 3 The diameter D inside the circular cylinder 4 is... The area is 0.08cm² 2 If the height of the cylindrical body 4 is 3 times the volume of the sphere / area, then the height of the cylindrical body 4 needs to be 1.34 mm.

[0025] A vent 42 is provided on the cylindrical wall of the cylindrical body 4 at a position away from the electronic components (such as PCBA) located inside the earphone cavity 1. Preferably, the vent 42 is located at the end of the cylindrical wall of the cylindrical body 4, so that the water flow direction is offset from the PCBA space, reducing the possibility of water splashing onto the PCBA 5.

[0026] In use, a complete tuning channel is formed through the tuning hole 11, the cylindrical body 4, and the vent 42. When encountering water, water enters through the tuning hole 11 and is blocked by the waterproof mesh 2, with most of its kinetic energy being attenuated. If a small amount of water still penetrates, it is temporarily stored inside the cylindrical body 4. The water entering the cylindrical body 4 forms a water film or water plug inside the cylinder due to surface tension, forming a physical structure that resists water, thereby achieving the purpose of waterproofing. Moreover, when the waterproofing fails, because the vent 42 is far away from the PCBA5 inside the headphone cavity 1, the direction of water flow is misaligned with the PCBA space, avoiding direct impact. This can effectively enhance the failure of water to PCBA5 at the IXP4 / TPX5 level, thereby enhancing the waterproofing of the headphones.

[0027] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. Other structures obtained by adopting the same or similar structures are all within the protection scope of this utility model.

Claims

1. A waterproof structure for the rear cavity of an earphone, comprising an earphone cavity and a tuning port disposed on the earphone cavity, characterized in that: It also includes a waterproof mesh and a waterproof sheet. The inner wall of the earphone cavity is provided with a circular cylinder corresponding to the position of the tuning hole. The circular cylinder is connected to the tuning hole. The waterproof mesh is located inside the circular cylinder. The waterproof sheet is closed at the end of the circular cylinder. The cylindrical wall of the circular cylinder is provided with a vent hole away from the position of the electronic components located inside the earphone cavity.

2. The waterproof structure for the rear cavity of the earphone according to claim 1, characterized in that, There is a gap between the waterproof mesh and the waterproof sheet.

3. The waterproof structure for the rear cavity of the earphone according to claim 1, characterized in that, A step is provided in the middle of the cylindrical body, and the edge of the waterproof mesh is attached to the step with adhesive backing.

4. The waterproof structure for the rear cavity of the earphone according to claim 1, characterized in that, The volume of the cylindrical body is ≥ 3 times the volume of the sphere calculated from the permeable area radius of the waterproof mesh.

5. The waterproof structure for the rear cavity of the earphone according to claim 1, characterized in that, The vent hole is located at the end of the cylindrical wall of the cylindrical body.

6. The waterproof structure for the rear cavity of the earphone according to any one of claims 1-5, characterized in that, The waterproof mesh is made of nylon.

7. The waterproof structure for the rear cavity of the earphone according to any one of claims 1-5, characterized in that, The waterproof sheet is made of PET, PP, PC, or PI.

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