Miniature loudspeaker, processing technology of metal inverter tube and electronic equipment

Abstract

The application discloses a micro loudspeaker, a processing technology of a metal reversing tube and electronic equipment, wherein the micro loudspeaker comprises a package body which is provided with a first sound outlet hole; a loudspeaker unit which is arranged in the package body and divides the package body into a front sound cavity and a rear sound cavity, and the front sound cavity is communicated with the first sound outlet hole; and a metal reversing tube which is communicated with the rear sound cavity at one end and communicated with the outside at the other end, and a waterproof coating is attached to the end face and / or the inner wall of the end of the metal reversing tube which is communicated with the outside. The application discloses a micro loudspeaker, a processing technology of a metal reversing tube and electronic equipment, and the waterproof coating is attached to the metal reversing tube, when water is encountered, water droplets are condensed on the tube opening, and the water continues to enter the metal reversing tube, so that the waterproof purpose is achieved, the waterproof performance of the micro loudspeaker is effectively enhanced, and the original acoustic performance of the micro loudspeaker is reserved.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic conversion, and in particular to a miniature loudspeaker, a metal bass reflex port manufacturing process, and an electronic device. Background Technology

[0002] With the continuous development of technology, bass reflex port technology has been gradually used in the design of miniature loudspeakers to improve the low-frequency response of loudspeaker systems.

[0003] Typically, one end of the bass reflex port connects to the rear acoustic chamber of the speaker, while the other end connects to the outside of the speaker. Because the front acoustic chamber has a relatively simple structure and shallow depth, water entering it can drain quickly without affecting the speaker's performance. However, due to the complex structure of the rear acoustic chamber and the length of the bass reflex port, water entering the rear acoustic chamber can damage internal components and may also accumulate inside, preventing timely drainage and causing the speaker to malfunction. Therefore, speakers equipped with bass reflex ports have much stricter requirements for their waterproof performance.

[0004] In existing technologies, a common solution is to modify the shape of the bass reflex port by creating a height difference between its two ends. Due to gravity, water can only remain at the inlet of the bass reflex port and cannot enter the rear acoustic cavity, thus preventing water splashing in from all directions. However, existing solutions only meet basic splash-proof requirements. When the speaker falls into water, it cannot effectively prevent water from entering and will still cause damage to the speaker. Summary of the Invention

[0005] The purpose of this invention is to provide a processing technology and electronic device for a miniature loudspeaker and a metal bass reflex port, which effectively enhances the waterproof performance of the miniature loudspeaker without affecting other acoustic properties.

[0006] To solve the above-mentioned technical problems, a miniature loudspeaker includes:

[0007] The package is equipped with a first sound outlet.

[0008] A speaker unit is disposed within the package, and the package is divided into a front acoustic cavity and a rear acoustic cavity, wherein the front acoustic cavity is connected to the first sound outlet.

[0009] A metal phase inverter tube, one end of which is connected to the rear acoustic cavity and the other end of which is connected to the outside, has a waterproof coating on the end face and / or inner wall of the end of the metal phase inverter tube that is connected to the outside.

[0010] Preferably, the waterproof coating is attached to the inner wall of the end of the metal phase inverter that communicates with the outside, and the attachment length of the waterproof coating is greater than 0.5 times the inner diameter of the metal phase inverter; or,

[0011] The waterproof coating adheres to the entire inner wall of the metal phase inverter.

[0012] Preferably, the waterproof coating is applied to a portion of the end face of the metal phase inverter that communicates with the outside; or...

[0013] The waterproof coating is attached to all end faces of the end of the metal phase inverter that is connected to the outside.

[0014] Preferably, the inner diameter of the metal phase inverter tube is in the range of 0.05-5mm.

[0015] Preferably, the thickness of the waterproof coating ranges from 0.01 to 10 μm.

[0016] Preferably, the contact angle between the surface of the waterproof coating and water is 90° to 180°.

[0017] Preferably, the contact angle is greater than 120°.

[0018] On the other hand, the present invention also proposes a processing technology for a metal bass reflex port used in the above-mentioned miniature loudspeaker, comprising:

[0019] Provide waterproof coating solutions;

[0020] Immerse the metal phase inverter tube completely or partially in the waterproof coating solution;

[0021] Remove the metal phase inverter tube and let it air dry naturally until it is completely dry, or put it in an oven until it is completely dry.

[0022] A metal phase inverter tube is obtained by uniformly attaching a waterproof coating to its inner wall and the end face that communicates with the outside.

[0023] On the other hand, the present invention also proposes a processing technology for a metal bass reflex port used in the above-mentioned miniature loudspeaker, comprising:

[0024] Provide waterproof coating solutions;

[0025] Apply the waterproof coating solution to the inner wall of the metal phase inverter tube and the end face that is connected to the outside by using a brush.

[0026] Allow the metal phase inverter tube to air dry naturally until it is completely dry, or place it in an oven until it is completely dried.

[0027] A metal phase inverter tube is obtained by uniformly attaching a waterproof coating to its inner wall and the end face that communicates with the outside.

[0028] On the other hand, the present invention also proposes an electronic device, characterized in that it includes a device housing and the aforementioned miniature speaker, wherein the miniature speaker is connected to the device housing.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] The miniature loudspeaker of this invention has a waterproof coating attached to the inner wall of the metal bass reflex tube that communicates with the rear acoustic cavity and to the end face that communicates with the outside. When the miniature loudspeaker comes into contact with water or falls into water, the water forms droplets upon contact with the waterproof coating and condenses at the tube opening, preventing water from continuing to enter the metal bass reflex tube, thereby achieving the purpose of waterproofing. This effectively enhances the waterproof performance of the miniature loudspeaker without changing the original structure of the loudspeaker or obstructing the sound outlet of the metal bass reflex tube, allowing the miniature loudspeaker to retain its original acoustic performance. Attached Figure Description

[0031] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances. In the drawings:

[0032] Figure 1 This is a schematic diagram of the structure of the miniature loudspeaker in this invention;

[0033] Figure 2 This is a cross-sectional view of the miniature loudspeaker in this invention;

[0034] Figure 3 This is a radiation path diagram of the sound waves generated in the front and rear acoustic cavities in this invention;

[0035] Figure 4 This is a cross-sectional view of a phase inverter tube in one embodiment of the present invention;

[0036] Figure 5 This is a cross-sectional view of a phase inverter tube in another embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the processing technology in which the metal phase inversion tube is completely immersed in the waterproof coating solution in this invention;

[0038] Figure 7 It was through Figure 6 A cross-sectional view of the metal phase inverter tube obtained after the process shown;

[0039] Figure 8 This is a schematic diagram of the process of immersing the metal phase inverter section into a waterproof coating solution in this invention;

[0040] Figure 9 It was through Figure 8 A cross-sectional view of the metal phase inverter tube obtained after the process shown;

[0041] Figure 10 This is a schematic diagram of the process of applying a waterproof coating solution to a metal phase inversion tube using a brush in this invention;

[0042] Figure 11 It was through Figure 10 A cross-sectional view of the metal phase inverter tube obtained after the process shown;

[0043] Figure 12 This is a schematic diagram illustrating the principle of contact angle in this invention;

[0044] Figure 13 This is a graph showing the test results of the waterproof performance of a metal phase inverter tube with an inner diameter of 0.5 mm coated with different waterproof coatings in this invention.

[0045] Figure 14 This is a graph showing the test results of the waterproof performance of the waterproof coating with a contact angle of 125° on metal phase inverters with different inner diameters.

[0046] As shown in the figure:

[0047] 1. Encapsulation body; 11. Front acoustic cavity; 12. Rear acoustic cavity; 13. First sound outlet; 2. Speaker driver; 21. Diaphragm assembly; 22. Voice coil assembly; 23. Magnetic circuit assembly; 6. Metal bass reflex port; 61. Port; 62. Inner wall; 63. End face; 7. Waterproof coating; 8. Waterproof coating solution; 9. Brush. Detailed Implementation

[0048] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0049] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0050] 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 in the specification of this invention 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.

[0051] like Figure 1 As shown, a miniature loudspeaker corresponding to a preferred embodiment of the present invention includes a package 1 and a loudspeaker unit 2 disposed within the package 1. It can be understood that in the field of miniature loudspeakers, the diameter of the loudspeaker unit used is ≤40mm.

[0052] The package 1 can be a separate unit, where the several parts are sealed and fixed together as a whole using methods such as welding, bonding, snap-fit, or plug-in during packaging, facilitating the disassembly and assembly of the miniature speaker; or it can be a one-piece unit, molded in one piece using methods such as injection molding, improving the stability of the speaker unit installation. Regardless of the type of package chosen, it is necessary to ensure that the package has high sealing performance, which is not limited here.

[0053] like Figure 2 As shown, the loudspeaker unit 2 is disposed within the package 1, dividing the package 1 into a front acoustic cavity 11 and a rear acoustic cavity 12. Specifically, the loudspeaker unit 2 includes a diaphragm assembly 21, a voice coil assembly 22, and a magnetic circuit assembly 23. The voice coil assembly 22 and the magnetic circuit assembly 23 are disposed on the same side of the diaphragm assembly 21, wherein one end of the voice coil assembly 22 is connected to the diaphragm assembly 21, and the other end is embedded in the magnetic gap of the magnetic circuit assembly 23. The diaphragm assembly 21 is sealed and embedded within the package 1 to divide the package 1 into the front acoustic cavity 11 and the rear acoustic cavity 12. To better understand the front acoustic cavity 11 and the rear acoustic cavity 12, in this embodiment, the side of the diaphragm assembly 21 without the voice coil assembly 22 is defined to surround the package 1 to form the front acoustic cavity 11, and the side of the diaphragm assembly with the voice coil assembly 22 is defined to surround the package 1 to form the rear acoustic cavity 12.

[0054] like Figure 3 As shown, the package 1 is provided with a first sound outlet 13 that communicates with the outside. The front acoustic cavity 11 is connected to the first sound outlet 13. The sound waves generated by the forced vibration diaphragm assembly 21 in the front acoustic cavity 11 are radiated to the outside through the front acoustic cavity 11 and the first sound outlet 13. When the diaphragm assembly 21 is forced to vibrate, sound waves are generated not only in the front acoustic cavity 11 but also in the rear acoustic cavity 12. In conventional loudspeakers, this part of the sound waves is usually discarded. However, in this invention, a metal bass reflex port 6 is used to guide the sound waves in the rear acoustic cavity 12 to the outside, thereby improving the loudness of the miniature loudspeaker.

[0055] Specifically, the metal bass reflex tube 6 is a sound-conducting structure of a certain length, and its shape is not limited. For example, its cross-sectional shape can be a circle, rectangle, ellipse, triangle, or other regular or irregular closed shape. The metal bass reflex tube 6 is made of metal material, such as copper, aluminum, stainless steel, or other metal materials. This ensures that the bass reflex tube has sufficient strength and is not prone to deformation during resonance, thus reducing acoustic loss. No limitation is made here.

[0056] One end of the metal bass reflex tube 6 is connected to the rear acoustic cavity 12, and the other end is connected to the outside. The sound waves generated by the forced vibration diaphragm assembly 21 in the rear acoustic cavity 12 are radiated to the outside through the rear acoustic cavity 12 and the metal bass reflex tube 6. A sealing filler is provided at the connection between the metal bass reflex tube 6 and the rear acoustic cavity 12 to ensure the airtightness of the miniature loudspeaker. The metal bass reflex tube 6 can be disposed outside or inside the package 1, and there is no limitation on this. Figure 3 The diagram shows the case where the metal bass reflex tube 6 is installed inside the package 1. In this case, the port 61 where the metal bass reflex tube 6 communicates with the outside and the connection point of the package 1 are also provided with sealing filler to ensure the airtightness of the miniature speaker.

[0057] Preferably, the distance between the center point of the port 61 connecting the metal phase converter 6 to the outside and the center point of the first sound outlet 13 is less than 100mm. The positions of the port 61 connecting the metal phase converter 6 to the outside and the first sound outlet 13 are not limited. They can be set on the same plane or staggered. As long as the direction of the sound wave generated in the front acoustic cavity radiating to the outside is the same as or similar to the direction of the sound wave generated in the rear acoustic cavity radiating to the outside, the loudness performance can be improved.

[0058] like Figure 4 and Figure 5 To improve the waterproof performance of miniature loudspeakers, especially the waterproof performance of metal bass reflex tubes, a waterproof coating 7 is applied to the end face 63 and / or inner wall 62 of the metal bass reflex tube 6 that communicates with the outside world to prevent water droplets from entering the tube and the rear acoustic cavity, thereby achieving axial waterproofing.

[0059] In this embodiment, a metal phase inverter tube 6 with a circular cross-section is preferably used. The inner diameter of the metal phase inverter tube 6 is preferably any value between 0.05-5mm. Of course, when the cross-sectional shape changes, the above-mentioned inner diameter range is also applicable to other cross-sectional shapes with the same area.

[0060] Specifically, a portion of the waterproof coating 7 is attached to the end face 63 of the metal phase inverter 6 that communicates with the outside, and / or another portion is attached to the inner wall 62 of the metal phase inverter 6. For the waterproof coating attached to the end face 63, there are multiple possible locations; for example, the waterproof coating may be attached only to a portion of the end face, or it may be attached to the entire end face. Similarly, there are multiple possible locations for the waterproof coating attached to the inner wall 62. One option is as follows: Figure 5 As shown, the waterproof coating 7 can be applied to the entire inner wall of the metal phase inverter 6; another option is as follows: Figure 4 As shown, the waterproof coating 7 can be applied only to the inner wall of the end of the metal phase-reversing tube 6 that connects to the outside, i.e., applied to a portion of the inner wall of the metal phase-reversing tube 6, and can extend to the port 61 that connects to the outside. The length of the waterproof coating 7 is greater than twice the inner diameter of the metal phase-reversing tube 6. When the cross-section of the metal phase-reversing tube changes, the aforementioned limitation on the length of the waterproof coating can be calculated based on the cross-sectional area. The thickness range of the waterproof coating 7 is preferably 0.01-10 μm, achieving waterproofing without affecting the sound output of the metal phase-reversing tube. Of course, the waterproof coating 7 can also be applied to the outer wall of the metal phase-reversing tube 6 to achieve radial waterproofing, which will not be elaborated on here.

[0061] The contact angle between the surface of the waterproof coating 7 and water is preferably in the range of 90° to 180°. For example... Figure 12 As shown, the contact angle refers to the tangent L at the gas-liquid interface drawn at the intersection of the gas (g), liquid (l), and solid (s) phases. l-g L with solid-liquid interface s-l The angle θ between the two is a measure of the degree of wetting. If θ < 90°, the solid is hydrophilic, meaning the liquid can wet the solid; the smaller the angle, the better the wetting. If θ > 90°, the solid is hydrophobic, meaning the liquid does not wet the solid, easily moves on the surface, and cannot enter the capillaries. The waterproof coating 7 selected here can be any existing hydrophobic coating.

[0062] Understandably, to achieve better waterproofing, a hydrophobic coating with a contact angle greater than 120° is preferred. The inner wall 62 of the miniature speaker's metal bass reflex tube and the end face 63 communicating with the outside are coated with a waterproof coating 7. When the miniature speaker is placed in a normal environment, the air pressure inside the rear acoustic cavity 12 and the metal bass reflex tube 6 is equal to the external air pressure. When the miniature speaker encounters water or falls into water, as the depth of immersion increases, the external water pressure gradually exceeds the air pressure inside the rear acoustic cavity 12 and the metal bass reflex tube 6, causing water to tend to enter the metal bass reflex tube 6. When water contacts the surface of the waterproof coating, based on the performance of the waterproof coating, a contact angle greater than 120° is formed, resulting in water droplets that condense at the tube opening, preventing further water from entering the metal bass reflex tube, thus achieving the purpose of waterproofing.

[0063] In a waterproof performance test, multiple metal bass reflex tubes of the same size can be taken, coated with waterproof coatings of different contact angles, and then installed on miniature speakers. The miniature speakers under test are placed in the same water depth, and after a period of time, they are simultaneously removed and allowed to dry. The performance of the dried miniature speakers is then tested. If the performance remains unchanged, the waterproof performance test is successful. Multiple metal bass reflex tubes can be subjected to various water depths to determine the maximum water depth that each waterproof coating can withstand. Figure 13The figure shows the waterproof performance and water depth tolerance test results of a metal phase inverter pipe with an inner diameter of 0.5 mm coated with different coatings. The horizontal axis of the figure represents the contact angle of the waterproof coating, and the vertical axis represents the water depth. Four different waterproof coatings were selected for this experiment, with contact angles of 95°, 110°, 125° and 150°, and water depths of 0.5m, 1m, 2m and 3m were selected respectively. Four metal bass reflex tubes with an inner diameter of 0.5mm were sequentially coated with waterproof coatings with contact angles of 95°, 110°, 125°, and 150°. The coated metal bass reflex tubes were then installed on miniature loudspeakers. In the first test, all four miniature loudspeakers were simultaneously placed in water at a depth of 0.5m. After one hour of settling, they were removed and allowed to air dry before performance testing. The results showed that the performance of all four loudspeakers remained unchanged. In the second test, all four loudspeakers were simultaneously placed in water at a depth of 1m. After one hour of settling, they were removed and allowed to air dry before performance testing. The results showed that the metal bass reflex tube with the 95° contact angle waterproof coating was ineffective at a depth of 1m, damaging the performance of the miniature loudspeakers. The other three materials effectively waterproofed the metal bass reflex tubes at a depth of 1m. In the third test, the coatings used in the second test were also applied to the metal bass reflex tubes. Three waterproof miniature speakers were placed simultaneously in water at a depth of 2 meters. After one hour, they were removed and allowed to air dry. Performance tests were then conducted on the three miniature speakers. The results showed that the metal bass reflex port with a waterproof coating of 110° contact angle was not effectively waterproofed at a depth of 2 meters, damaging the performance of the miniature speaker. The other two materials were able to effectively waterproof the metal bass reflex port of the miniature speaker at a depth of 2 meters. In the fourth test, two miniature speakers that were also waterproof in the third test were placed simultaneously in water at a depth of 3 meters. After one hour, they were removed and allowed to air dry. Performance tests were then conducted on the two miniature speakers. The results showed that the metal bass reflex port with a waterproof coating of 125° contact angle was not effectively waterproofed at a depth of 3 meters, damaging the performance of the miniature speaker. However, the metal bass reflex port with a waterproof coating of 150° contact angle was still effectively waterproofed at a depth of 3 meters. The test results above show that applying a waterproof coating to the end face and inner wall of the metal phase inverter pipe at the end that connects to the outside can effectively prevent water from continuing to enter the metal phase inverter pipe, thereby achieving the purpose of waterproofing. At the same time, the better the hydrophobicity of the waterproof coating, the deeper the water it can withstand.

[0064] In another waterproof performance test, multiple metal bass reflex tubes of different sizes can be taken, coated with a waterproof coating of the same contact angle, and then installed on a WeChat speaker. They are then placed in the same water depth and left for a period of time. Afterward, they are removed and allowed to air dry. The performance of the dried miniature speaker is then tested. If the performance remains unchanged, the waterproof performance test is successful. Multiple metal bass reflex tubes of different sizes can be subjected to various water depths to determine the maximum water depth that each size of metal bass reflex tube can withstand. (See figure). Figure 14 The graph shows the waterproof performance and withstandable water depth of a waterproof coating with a contact angle of 125° on metal phase inverters with different pipe diameters. The horizontal axis represents the pipe diameter, and the vertical axis represents the water depth. Four different specifications of metal phase inverters were selected for this experiment, with pipe diameters of 0.2mm, 0.5mm, 1mm, and 2mm, and water depths of 0.5m, 1m, 2m, and 3m, respectively. A waterproof coating with a contact angle of 125° was applied to four different sizes of metal bass reflex tubes. Each tube with the waterproof coating was then installed on a miniature speaker. In the first test, all four miniature speakers were simultaneously placed in water at a depth of 0.5m. After one hour of settling, they were removed and allowed to air dry before performance testing. The results showed that the performance of all four speakers remained unchanged. In the second test, all four speakers were simultaneously placed in water at a depth of 1m. After one hour of settling, they were removed and allowed to air dry before performance testing. The results showed that the metal bass reflex tube with an inner diameter of 2mm, even with the waterproof coating, was not effectively waterproofed at a depth of 1m, thus damaging its performance. The other three sizes of metal bass reflex tubes still performed well at a depth of 1m. The first test involved placing three miniature speakers, all of which were waterproof in the second test, simultaneously in water at a depth of 2 meters. After one hour of settling and air-drying, the speakers were tested. The results showed that the metal bass reflex tube with an inner diameter of 1 mm was not waterproof at 2 meters, while the other two types of metal bass reflex tubes remained waterproof. The second test involved placing two of the waterproof miniature speakers in water at a depth of 3 meters. After one hour of settling and air-drying, the speakers were tested again. The results showed that the metal bass reflex tube with an inner diameter of 0.5 mm was not effectively waterproof at 3 meters, damaging its performance. The metal bass reflex tube with an inner diameter of 0.2 mm remained effectively waterproof at 3 meters. These test results indicate that the inner diameter of the metal bass reflex tube affects the waterproof performance of the miniature speaker. With the same waterproof coating, a smaller inner diameter allows for greater water depth.

[0065] The present invention also proposes a processing technology for a metal bass reflex tube, which is applied in the above-mentioned miniature loudspeaker. The specific structure of the metal bass reflex tube is described in the above embodiments. Since the metal bass reflex tube 6 adopts all the technical solutions of all the above embodiments, it has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0066] like Figures 6-9 As shown, in one embodiment, the processing technology of the metal phase inverter includes the following steps:

[0067] Provide waterproof coating solution 8, placed in a container;

[0068] The preferred range for the contact angle between the surface and water after applying the waterproof coating solution is 90° to 180°, especially a waterproof coating solution with a contact angle greater than 120°.

[0069] Immerse the metal phase inverter 6 completely or partially in the waterproof coating solution 8;

[0070] Here, "complete immersion" can be understood as directly placing the metal phase inverter 6 into the container holding the waterproof coating solution (e.g., Figure 6 (As shown); partial immersion can be understood as placing the end of the metal phase inverter 6 that is connected to the outside into a container holding the waterproof coating solution, with an immersion depth greater than twice the inner diameter of the metal phase inverter 6 (e.g., Figure 8 (As shown). Through this soaking process, the waterproof coating 7 will adhere not only to the inner wall of the metal phase inverter 6 and the end face communicating with the outside, but also to the outer wall of the metal phase inverter 6, achieving both axial and radial waterproofing. The soaking time can be adjusted according to actual conditions; it can be removed when the waterproof coating solution is evenly adhered to the metal phase inverter 6, and there is no fixed timeframe.

[0071] Remove the metal phase inverter tube 6 and let it air dry naturally or put it in an oven until it is dry.

[0072] The air-drying time can be adjusted according to the actual situation, until the waterproof coating is partially dry; the temperature and time of oven drying can also be adjusted according to the actual situation, again until the waterproof coating is partially dry, and no limit is set here.

[0073] As shown in the figure, a metal phase-reversing pipe with a uniform waterproof coating applied to its outer wall, inner wall, and one end face connected to the outside is obtained (e.g., Figure 7 and Figure 9 (As shown).

[0074] like Figure 10 and Figure 11 As shown, in another embodiment, the processing technology of the metal phase inverter includes the following steps:

[0075] Provide waterproof coating solution 8, placed in a container;

[0076] The preferred range for the contact angle between the surface and water after applying the waterproof coating solution is 90° to 180°, especially a waterproof coating solution with a contact angle greater than 120°.

[0077] Apply the waterproof coating solution 8 to the inner wall of the metal phase inverter 6 and the end face that connects to the outside using a brush 9. Figure 10 As shown;

[0078] The inner wall coating extends inward from the end of the metal phase-reversing tube 6 that connects to the outside by at least twice the inner diameter of the metal phase-reversing tube 6 to ensure reliable waterproofing. Furthermore, depending on the option, the entire inner wall of the metal phase-reversing tube 6 can be coated. When the cross-section of the metal phase-reversing tube changes, the aforementioned length limit for the waterproof coating can be calculated based on the cross-sectional area.

[0079] Allow the metal phase inverter tube 6 to air dry naturally until it is dry, or put it in an oven until it is dry.

[0080] The air-drying time can be adjusted according to the actual situation, until the waterproof coating is partially dry; the temperature and time of oven drying can also be adjusted according to the actual situation, again until the waterproof coating is partially dry, and no limit is set here.

[0081] A metal phase inverter tube (e.g.) with a uniform waterproof coating on its outer wall, inner wall, and the end face communicating with the outside is obtained. Figure 11 (As shown).

[0082] It is understandable that a waterproof coating can also be applied to the metal bass reflex tube using other processing techniques, and no further limitations are made here. After processing, one end of the metal bass reflex tube 6 is installed into the rear acoustic cavity 12 of the miniature speaker, and the end coated with the waterproof coating is connected to the outside. When the miniature speaker comes into contact with water or falls into water, the water forms droplets on the surface of the waterproof coating and condenses at the tube opening, preventing water from continuing to enter the metal bass reflex tube, thereby effectively achieving the purpose of waterproofing.

[0083] The present invention also proposes an electronic device, which includes a device housing and the aforementioned miniature speaker. The miniature speaker is connected to the device housing. For the specific structure of the miniature speaker, please refer to the above embodiments. Since the electronic device adopts all the technical solutions of all the above embodiments, it has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0084] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A miniature loudspeaker, characterized in that, include: The package is equipped with a first sound outlet. A speaker unit is disposed within the package, and the package is divided into a front acoustic cavity and a rear acoustic cavity, wherein the front acoustic cavity is connected to the first sound outlet. A metal bass reflex tube is independently disposed within the package, with both ends being open ports. The end of the metal bass reflex tube is connected to the rear acoustic cavity, and the front end of the metal bass reflex tube is connected to the outside. The front end of the metal bass reflex tube and the first sound outlet are disposed on the same plane. A waterproof coating is attached to the entire end face, the entire inner wall, and the entire outer wall of the front end of the metal bass reflex tube.

2. The miniature loudspeaker according to claim 1, characterized in that, The inner diameter of the metal phase inverter tube ranges from 0.05 to 5 mm.

3. The miniature loudspeaker according to claim 1, characterized in that, The thickness of the waterproof coating ranges from 0.01 to 10 μm.

4. The miniature loudspeaker according to any one of claims 1 to 3, characterized in that, The contact angle between the surface of the waterproof coating and water is 90° to 180°.

5. The miniature loudspeaker according to claim 4, characterized in that, The contact angle is greater than 120°.

6. A processing method for a metal bass reflex port used in a miniature loudspeaker as described in any one of claims 1-5, characterized in that, include: Provide waterproof coating solutions; The metal phase inverter tube is completely immersed in the waterproof coating solution; Remove the metal phase inverter tube and let it air dry naturally until it is completely dry, or put it in an oven until it is completely dry. A metal phase inverter tube having a waterproof coating uniformly applied to all end faces, including the inner wall, outer wall, and the end connected to the outside.

7. An electronic device, characterized in that, It includes a device housing and a miniature speaker as described in any one of claims 1 to 5, wherein the miniature speaker is connected to the device housing.

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