CN116074686A - Processing technology of miniature loudspeaker and metal phase inversion tube and electronic equipment - Google Patents

Abstract

The invention discloses a micro-speaker, a processing technology of a metal phase inversion tube and an electronic device, wherein the micro-speaker comprises: the packaging body is provided with a first sound outlet; the loudspeaker unit is arranged in the packaging body and divides the packaging body into a front sound cavity and a rear sound cavity, and the front sound cavity is communicated with the first sound outlet; one end of the metal phase inversion tube is communicated with the rear acoustic cavity, the other end of the metal phase inversion tube is communicated with the outside, and a waterproof coating is attached to the end face and/or the inner wall of one end of the metal phase inversion tube communicated with the outside. According to the processing technology of the miniature loudspeaker, the metal phase inversion tube and the electronic equipment, the waterproof coating is attached to the metal phase inversion tube, when water is encountered, water drops are condensed at the tube orifice, and water is prevented from continuously entering the metal phase inversion tube, so that the aim of waterproofing is achieved, the waterproof performance of the miniature loudspeaker is effectively enhanced, and meanwhile, the original acoustic performance of the miniature loudspeaker is reserved.

Description

Processing technology of miniature loudspeaker and metal phase inversion tube and electronic equipment

Technical Field

The invention relates to the field of electroacoustic conversion, in particular to a processing technology of a miniature loudspeaker and a metal phase inversion tube and electronic equipment.

Background

With the development of technology, inverter technology is increasingly used in the design of micro-speakers to improve the low frequency response of speaker systems.

Typically, the inverter tube opens at one end into the rear acoustic chamber of the speaker and at the other end into the speaker exterior. Because the structure of the front acoustic cavity is simpler and the depth is shallower, water can be discharged faster after entering the front acoustic cavity, and the performance of the loudspeaker is not affected. However, due to the complex structural design of the rear acoustic cavity and the length design of the phase inversion tube, when water enters the rear acoustic cavity, the rear acoustic cavity is damaged, and the rear acoustic cavity cannot be timely discharged, so that the loudspeaker is invalid in function. The speaker incorporating the inverter tube therefore has a more stringent requirement for its waterproof performance.

In the prior art, the commonly adopted technical scheme is to improve the shape of the phase inversion tube, and set the two ends of the phase inversion tube to have a certain height difference, because of the gravity action, water can only stay at the inlet part of the phase inversion tube and can not enter the rear acoustic cavity, thereby preventing water splashed in all directions from entering. However, the existing scheme can only meet the common splash-proof requirement, and when the loudspeaker falls into water, the loudspeaker cannot be effectively waterproof, and the loudspeaker is damaged.

Disclosure of Invention

The invention aims to provide a micro-speaker, a processing technology of a metal phase inversion tube and electronic equipment, which can effectively enhance the waterproof performance of the micro-speaker on the premise of not influencing other acoustic performances of the micro-speaker.

In order to solve the above technical problems, a micro speaker includes:

the packaging body is provided with a first sound outlet;

the loudspeaker unit is arranged in the packaging body and divides the packaging body into a front sound cavity and a rear sound cavity, and the front sound cavity is communicated with the first sound outlet;

one end of the metal phase inversion tube is communicated with the rear acoustic cavity, the other end of the metal phase inversion tube is communicated with the outside, and a waterproof coating is attached to the end face and/or the inner wall of one end of the metal phase inversion tube communicated with the outside.

Preferably, the waterproof coating is attached to the inner wall of one end of the metal inverter tube, which communicates with the outside, and the attaching length of the waterproof coating is greater than 0.5 times the inner diameter of the metal inverter tube; or alternatively, the process may be performed,

the waterproof coating is attached to the inner wall of the entire metal inverter tube.

Preferably, the waterproof coating is attached to a part of an end face of one end of the metal inverter tube which communicates with the outside; or alternatively, the process may be performed,

the waterproof coating is attached to all end surfaces of one end of the metal phase inversion tube communicated with the outside.

Preferably, the metal inverter tube has an inner diameter ranging from 0.05 to 5mm.

Preferably, the thickness of the waterproof coating layer is in the range of 0.01-10um.

Preferably, the contact angle of the waterproof coating surface with water is 90 ° to 180 °.

Preferably, the contact angle is greater than 120 °.

On the other hand, the invention also provides a processing technology of the metal phase inversion tube applied to the micro-speaker, which comprises the following steps:

providing a water-repellent coating solution;

immersing the metal inverter tube completely or partially into the waterproof coating solution;

taking out the metal phase inversion tube, naturally airing until airing, or putting the metal phase inversion tube into a baking oven until baking;

the metal phase inversion tube with the waterproof coating uniformly attached to the end face of one end communicated with the outside is obtained.

On the other hand, the invention also provides a processing technology of the metal phase inversion tube applied to the micro-speaker, which comprises the following steps:

providing a water-repellent coating solution;

dipping waterproof coating solution by a brush, and coating the waterproof coating solution on the inner wall of the metal phase inversion tube and the end face of one end communicated with the outside;

naturally airing the metal phase inversion tube until airing or putting the metal phase inversion tube into an oven until drying;

the metal phase inversion tube with the waterproof coating uniformly attached to the end face of one end communicated with the outside is obtained.

On the other hand, the invention also provides electronic equipment which is characterized by comprising an equipment shell and the micro-speaker, wherein the micro-speaker is connected with the equipment shell.

Compared with the prior art, the invention has the following advantages:

according to the miniature loudspeaker, the waterproof coating is attached to the inner wall of the metal phase inversion tube communicated with the rear sound cavity and the end face of one end communicated with the outside, when the miniature loudspeaker meets water or falls into water, the water forms a water drop shape after contacting with the waterproof coating and is condensed at the tube orifice, so that the water is prevented from continuously entering the metal phase inversion tube, the waterproof performance of the miniature loudspeaker is effectively enhanced, the original structure of the loudspeaker is not changed, the sound outlet of the metal phase inversion tube is not blocked, and the original acoustic performance of the miniature loudspeaker is kept.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, proportional sizes, and the like of the respective components in the drawings are merely illustrative for aiding in understanding the present invention, and are not particularly limited. Those skilled in the art with access to the teachings of the present invention can select a variety of possible shapes and scale sizes to practice the present invention as the case may be. In the drawings:

fig. 1 is a schematic view of a micro-speaker according to the present invention;

fig. 2 is a cross-sectional view of a micro speaker of the present invention;

FIG. 3 is a radiation path diagram of sound waves generated in the front and rear acoustic chambers in the present invention;

FIG. 4 is a cross-sectional view of a gold inverter tube in one embodiment of the invention;

FIG. 5 is a cross-sectional view of a gold inverter tube in another embodiment of the invention;

FIG. 6 is a schematic illustration of the process of the present invention wherein the metal inverter tube is fully immersed in a water repellent coating solution;

FIG. 7 is a cross-sectional view of a metal inverter tube obtained after the process shown in FIG. 6;

FIG. 8 is a schematic view of a process for immersing a metal inverter tube portion in a water-repellent coating solution in accordance with the present invention;

FIG. 9 is a cross-sectional view of the metal inverter tube obtained after the process shown in FIG. 8;

FIG. 10 is a schematic view of the process of applying a water repellent coating solution to a metal inverter tube with a brush in accordance with the present invention;

FIG. 11 is a cross-sectional view of the metal inverter tube obtained after the process shown in FIG. 10;

FIG. 12 is a schematic diagram of the principle of contact angle in the present invention;

FIG. 13 is a graph showing the results of waterproof performance tests of a metal inverter tube of 0.5mm inside diameter coated with various waterproof coatings in accordance with the present invention;

FIG. 14 is a graph showing the results of the waterproof performance test of a waterproof coating layer having a contact angle of 125℃on metal inverter tubes having different inside diameters of the tube orifice according to the present invention.

The figure shows:

1. a package; 11. a front acoustic cavity; 12. a rear acoustic cavity; 13. a first sound outlet hole; 2. a speaker unit; 21. a diaphragm assembly; 22. a voice coil assembly; 23. a magnetic circuit assembly; 6. a metal inverter tube; 61. a port; 62. an inner wall; 63. an end face; 7. a waterproof coating; 8. a water-repellent coating solution; 9. a brush.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, 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 belongs. The terminology used herein in the description of the 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.

As shown in fig. 1, a micro-speaker according to a preferred embodiment of the present invention includes a package 1 and a speaker unit 2 provided in the package 1, and it is understood that in the micro-speaker field, the diameter of the speaker unit used is less than or equal to 40mm.

The package body 1 can be split, and a plurality of split parts are sealed and fixed into a whole in a welding, bonding, buckling, inserting and other modes during packaging, so that the micro-speaker can be conveniently disassembled and assembled; the loudspeaker unit can also be integrated, and the stability of the installation of the loudspeaker unit is improved by adopting injection molding and other modes for integrated forming. Whichever type of package is selected, it is necessary to ensure that the package has a high sealing performance, which is not limited herein.

As shown in fig. 2, the speaker unit 2 is disposed in the package 1, and divides the package 1 into a front sound chamber 11 and a rear sound chamber 12. Specifically, the speaker unit 2 includes a diaphragm assembly 21, a voice coil assembly 22, and a magnetic circuit assembly 23, where the voice coil assembly 22 and the magnetic circuit assembly 23 are disposed on the same side of the diaphragm assembly 21, and one end of the voice coil assembly 22 is connected to the diaphragm assembly 21, and the other end is embedded in a magnetic gap of the magnetic circuit assembly 23. The diaphragm assembly 21 is hermetically embedded in the package 1 to divide the package 1 into a front acoustic cavity 11 and a rear acoustic cavity 12, and in order to understand the front acoustic cavity 11 and the rear acoustic cavity 12 more clearly, in this embodiment, a side of the diaphragm assembly 21, on which the voice coil assembly 22 is not disposed, is defined to surround the package with the front acoustic cavity 11, and a side of the diaphragm assembly, on which the voice coil assembly 22 is disposed, surrounds the package 1 with the rear acoustic cavity 12.

As shown in fig. 3, the package 1 is provided with a first sound outlet 13 communicating with the outside, the front sound chamber 11 communicates with the first sound outlet 13, and sound waves generated in the front sound chamber 11 by the diaphragm assembly 21 for forced vibration are radiated to the outside through the front sound chamber 11 and the first sound outlet 13. When the diaphragm assembly 21 is forced to vibrate, not only sound waves are generated in the front sound chamber 11 but also sound waves are generated in the rear sound chamber 12, and in a conventional speaker, a part of the sound waves are generally abandoned, and in the present invention, the sound waves in the rear sound chamber 12 are guided to the outside by the metal inverter tube 6, thereby enhancing the loudness of the micro-speaker.

Specifically, the metal inverter tube 6 is an acoustic guide structure having a certain length, and its shape is not limited, and for example, its cross-sectional shape may be a circular, rectangular, elliptical, triangular, or other regular or irregular closed pattern. The metal inverter tube 6 is made of a metal material, and the metal material may be copper, aluminum, stainless steel, or other metal materials, so that the inverter tube has sufficient strength, is not easy to deform during resonance, reduces acoustic loss, and is not limited herein.

One end of the metal phase inversion tube 6 is communicated with the rear acoustic cavity 12, the other end is communicated with the outside, sound waves generated in the rear acoustic cavity 12 by the vibrating diaphragm assembly 21 subjected to forced vibration are radiated to the outside through the rear acoustic cavity 12 and the metal phase inversion tube 6, and sealing filler is arranged at the joint of the metal phase inversion tube 6 and the rear acoustic cavity 12 so as to ensure the tightness of the micro-speaker. The metal inverter tube 6 may be provided outside the package 1 or may be provided inside the package 1, and is not limited thereto. In fig. 3, a case is shown in which the metal inverter tube 6 is provided in the package 1, in which case the connection of the port 61 of the metal inverter tube 6 communicating with the outside and the package 1 is also provided with a sealing filler to secure the sealing property of the micro speaker.

Preferably, the distance between the center point of the port 61 where the metal phase inversion tube 6 is communicated with the outside and the center point of the first sound outlet 13 is smaller than 100mm, the positions of the port 61 where the metal phase inversion tube 6 is communicated with the outside and the first sound outlet 13 are not limited, and the metal phase inversion tube 6 and the first sound outlet 13 can be arranged on the same plane or can be staggered with each other, and the loudness performance can be improved only by the fact that the direction of the sound wave generated in the front sound cavity radiating to the outside is the same as or similar to the direction of the sound wave generated in the rear sound cavity radiating to the outside.

In order to improve the waterproof performance of the micro-speaker, particularly the waterproof performance of the metal inverter tube as shown in fig. 4 and 5, a waterproof coating 7 is attached to an end surface 63 and/or an inner wall 62 of the metal inverter tube 6 which is communicated with the outside to block water drops from entering the tube and the rear acoustic cavity, thereby achieving the purpose of axial waterproof.

In the present embodiment, the metal inverter tube 6 having a circular cross section is preferably used, and the inner diameter range of the metal inverter tube 6 is preferably any value between 0.05 and 5mm, and of course, when the cross section changes, the inner diameter range is also applicable to other cross section shapes having the same area.

Specifically, the waterproof coating 7 is attached to a part of the one end face 63 of the metal inverter tube 6 communicating with the outside, and/or another part is attached to the inner wall 62 of the metal inverter tube 6, where there are various positions for the waterproof coating attached to the end face 63, for example, the waterproof coating is attached to only a part of the end faces, or to all of the end faces; there are also various options for the water-repellent coating to be attached to the inner wall 62. An alternative is shown in fig. 5, in which a waterproof coating 7 may be applied to the entire inner wall of the metal inverter tube 6; alternatively, as shown in fig. 4, the waterproof coating 7 may be coated only on the inner wall of the end of the metal inverter tube 6 communicating with the outside, that is, on a part of the inner wall of the metal inverter tube 6 and may extend to the port 61 communicating with the outside, and the length of the waterproof coating 7 is greater than 2 times the inner diameter of the metal inverter tube 6, and when the cross section of the metal inverter tube is changed, the above-mentioned limitation of the length of the waterproof coating may be estimated according to the cross-sectional area. The thickness of the waterproof coating 7 is preferably 0.01-10um, and the sound output of the metal inverter tube is not affected while the waterproof purpose is achieved. Of course, the waterproof coating 7 can also be coated on the outer wall of the metal phase inversion tube 6 to achieve the purpose of radial waterproof, and will not be described in detail herein.

The contact angle of the surface of the waterproof coating 7 with water is preferably in the range of 90 ° to 180 °. As shown in FIG. 12, the contact angle refers to the tangent line L of the gas-liquid interface at the intersection of the gas g, liquid L and solid s _l-g Boundary line L with solid-liquid _s-l The angle θ between them is a measure of the degree of wetting. If theta is<90 °, the solid is lyophile, i.e. the liquid wets the solid, the smaller the angle, the better the wettability; if theta is>90 deg. the solid is lyophobic, i.e. the liquid does not wet the solid, is easily moved over the surface and cannot enter the capillary holes. The water-repellent coating 7 selected here may be any existing water-repellent coating.

It will be appreciated that in order to achieve a better water-repellent effect, it is preferred to use a hydrophobic coating having a contact angle of greater than 120 °. The inner wall 62 of the metal phase inversion tube of the micro-speaker and the end face 63 of one end communicated with the outside are coated with a waterproof coating 7, when the micro-speaker is placed in a normal environment, the air pressure in the rear acoustic cavity 12 and the metal phase inversion tube 6 is balanced with the air pressure of the outside; when the micro-speaker encounters water or falls into water, the external water pressure is gradually larger than the air pressure in the rear sound cavity 12 and the metal phase inversion tube 6 along with the increase of the water falling depth, the water has a trend of entering the metal phase inversion tube 6, and when the water contacts the surface of the waterproof coating, a contact angle larger than 120 degrees is formed according to the performance of the waterproof coating, so that water drops are formed and are condensed at the tube orifice, and the water is blocked from continuously entering the metal phase inversion tube, so that the aim of water prevention is fulfilled.

When a waterproof performance test is carried out, a plurality of metal phase inversion tubes with the same size specification can be taken, waterproof coatings with different contact angles are respectively coated, then the metal phase inversion tubes are respectively installed to the micro-speakers, the micro-speakers to be tested are placed at the same water depth position, the micro-speakers to be tested are taken out and are placed for a period of time and are dried in the air, the performance test is carried out on the micro-speakers after the drying, if the performance of the micro-speakers is unchanged, the waterproof performance test is carried out, the metal phase inversion tubes can be subjected to different water depths for a plurality of times, and the bearable water depth of each waterproof coating is obtained. As shown in FIG. 13, the waterproof performance and the bearable water depth test result graphs of different coatings applied to the metal inverter tube with the inner diameter of 0.5mm are shown, wherein the abscissa represents the contact angle of the waterproof coating, the ordinate represents the water depth, 4 different waterproof coatings are selected in the experiment, the contact angles of the waterproof coatings are 95 DEG, 110 DEG, 125 DEG and 150 DEG, and the water depths of the waterproof coatings are respectively selected to be 0.5m, 1m, 2m and 3m. Sequentially coating waterproof coatings with contact angles of 95 DEG, 110 DEG, 125 DEG and 150 DEG on 4 metal phase inversion tubes with the inner diameter of 0.5mm, respectively mounting the metal phase inversion tubes attached with the waterproof coatings on the micro speakers, simultaneously placing the 4 micro speakers at the position with the water depth of 0.5m for the first time, standing for one hour, taking out, naturally airing, and performing performance test on the four micro speakers, wherein the performance of the 4 micro speakers is not changed; the method comprises the steps of simultaneously placing 4 micro-speakers at the position with the water depth of 1m for the second time, standing for one hour, taking out, naturally airing, and performing performance test on the 4 micro-speakers, wherein the metal phase inversion tube attached with the waterproof coating with the contact angle of 95 degrees cannot be effectively waterproof when the water depth is 1m, the performance of the micro-speakers is damaged, and the other 3 materials can be used for effectively waterproof the metal phase inversion tube of the micro-speakers when the water depth is 1 m; thirdly, simultaneously placing 3 micro-speakers with the waterproof effect in the second test at the position of 2m in water depth, standing for one hour, taking out, naturally airing, and performing performance test on the 3 micro-speakers, wherein the metal phase inversion tube attached with the waterproof coating with the contact angle of 110 degrees cannot be effectively waterproof when the water depth is 2m, the performance of the micro-speakers is damaged, and the other 2 materials can effectively waterproof the metal phase inversion tube of the micro-speakers when the water depth is 2 m; and fourthly, simultaneously placing 2 micro-speakers with the waterproof effect in the third test at the position of 3m in water depth, standing for one hour, taking out, naturally airing, and performing performance test on the 2 micro-speakers, wherein the test result shows that the metal phase inversion tube attached with the waterproof coating with the contact angle of 125 degrees cannot be effectively waterproof when the water depth is 3m, the performance of the micro-speakers is damaged, and the metal phase inversion tube attached with the waterproof coating with the contact angle of 150 degrees still can be effectively waterproof when the water depth is 3m. According to the test results, the waterproof coating is coated on the end face and the inner wall of the pipe orifice at one end of the metal phase inversion pipe communicated with the outside, so that water can be effectively prevented from continuously entering the metal phase inversion pipe, the waterproof purpose is achieved, and meanwhile, the waterproof coating with better hydrophobic performance can bear deeper water depth.

When another waterproof performance test is performed, a plurality of metal phase inversion tubes with different sizes can be taken, waterproof coatings with the same contact angle are respectively coated, then the metal phase inversion tubes are respectively installed to the WeChat loudspeaker, the metal phase inversion tubes are placed at the same water depth position, the metal phase inversion tubes are taken out and are placed for a period of time, the metal phase inversion tubes are left to stand and air-dried, performance test is performed on the air-dried micro loudspeaker, if the performance of the micro loudspeaker is not changed, the metal phase inversion tubes with different sizes can be subjected to multiple times of different water depths through the waterproof performance test, and the bearable water depth of the metal phase inversion tubes with different specifications is obtained. As shown in FIG. 14, a graph of the waterproof performance and the sustainable water depth test results of the waterproof coating with the contact angle of 125 degrees on metal inverter tubes with different inner diameters of the tube orifice is shown, wherein the abscissa represents the size of the inner diameter of the tube orifice, and the ordinate represents the water depth. The experiment selects 4 metal phase inversion tubes with different specifications, the inner diameters of the tube orifices are respectively 0.2mm, 0.5mm, 1mm and 2mm, and the depths of water depth are respectively 0.5m, 1m, 2m and 3m. Respectively coating waterproof coatings with a contact angle of 125 ℃ on 4 metal phase inversion tubes with different specifications, respectively mounting the metal phase inversion tubes attached with the waterproof coatings on the micro-speakers, simultaneously placing the 4 micro-speakers at the position with the water depth of 0.5m for the first time, standing for one hour, taking out, naturally airing, and performing performance test on the four micro-speakers, wherein the performance of the 4 micro-speakers is unchanged; the method comprises the steps of simultaneously placing 4 micro-speakers at the position with the water depth of 1m for the second time, standing for one hour, taking out, naturally airing, and performing performance test on the 4 micro-speakers, wherein the metal phase inversion tube with the inner diameter of a tube orifice of 2mm is in the water depth of 1m, and even if the metal phase inversion tube is coated with a waterproof coating, the metal phase inversion tube cannot be effectively waterproof, the performance of the micro-speakers is damaged, and the other 3 metal phase inversion tubes still have waterproof performance in the water depth of 1 m; thirdly, simultaneously placing 3 micro-speakers with the waterproof effect in the second time at the position of 2m in water depth, standing for one hour, taking out, naturally airing, and performing performance test on the 3 micro-speakers, wherein the metal phase inversion tube with the inner diameter of the tube orifice of 1mm is obtained according to the test result, when the water depth of 2m is low, the water cannot be prevented, and the rest 2 metal phase inversion tubes still have waterproof performance; and fourthly, simultaneously placing 2 micro-speakers with waterproof performance in the third time at the position of 3m in water depth, standing for one hour, taking out, naturally airing, and performing performance test on the 2 micro-speakers, wherein the test result shows that the metal phase inversion tube with the inner diameter of 0.5mm cannot effectively perform waterproof when the water depth is 3m, the performance of the micro-speakers can be damaged, and the metal phase inversion tube with the inner diameter of 0.2mm still can effectively perform waterproof when the water depth is 3m. According to the test results, the inner diameter of the pipe orifice of the metal phase inversion pipe influences the waterproof performance of the micro-speaker, and on the premise of coating waterproof coatings with the same specification, the smaller the inner diameter of the pipe orifice is, the deeper the sustainable water depth is.

The invention also provides a processing technology of the metal phase inversion tube, which is applied to the micro-speaker, the specific structure of the metal phase inversion tube refers to the embodiment, and the metal phase inversion tube 6 adopts all the technical schemes of all the embodiments, so that the metal phase inversion tube has all the beneficial effects brought by the technical schemes of the embodiments and is not repeated herein.

As shown in fig. 6-9, in one embodiment, the process of manufacturing the metal inverter tube includes the steps of:

providing a waterproof coating solution 8, and placing in a container;

the contact angle of the water with the surface coated with the water-repellent coating solution is preferably in the range of 90 ° to 180 °, and in particular, a water-repellent coating solution having a contact angle of more than 120 ° is used.

Immersing the metal inverter tube 6 completely or partially in the waterproof coating solution 8;

wherein, complete immersion is understood to mean that the metal inverter tube 6 is directly placed in a container containing a waterproof coating solution (as shown in fig. 6); partial immersion is understood to mean that the end of the metal inverter tube 6 which communicates with the outside is placed in a container containing a waterproof coating solution, and the immersion depth is greater than 2 times the inner diameter of the metal inverter tube 6 (as shown in fig. 8). So soaking, waterproof coating 7 can not only adhere to the inner wall of metal phase inversion tube 6 and the terminal surface of one end that communicates with the external world, still can adhere to on the outer wall of metal phase inversion tube 6, reaches axial waterproof and radial waterproof's effect simultaneously. The soaking time can be adjusted according to the actual situation, and the waterproof coating solution can be taken out when being uniformly adhered to the metal inverter tube 6, and the method is not limited herein.

Taking out the metal phase inversion tube 6, naturally airing until airing, or putting the metal phase inversion tube into a baking oven until baking;

the open time can be adjusted according to actual conditions, and the waterproof coating is dried; the temperature and time of drying by adopting the oven can be adjusted according to actual conditions, and the temperature and time can be adjusted when the waterproof coating is dried, and the method is not limited.

As shown in fig. 7 and 9, a metal inverter tube having a waterproof coating uniformly attached to one end face of the outer wall, the inner wall and the end face communicating with the outside is obtained.

As shown in fig. 10 and 11, in another embodiment, the process of manufacturing the metal inverter tube includes the steps of:

providing a waterproof coating solution 8, and placing in a container;

the contact angle of the water with the surface coated with the water-repellent coating solution is preferably in the range of 90 ° to 180 °, and in particular, a water-repellent coating solution having a contact angle of more than 120 ° is used.

Dipping the waterproof coating solution 8 by a brush 9 and uniformly coating the inner wall of the metal inverter tube 6 and the end face of one end communicating with the outside as shown in fig. 10;

wherein the inner wall coating range extends inward by at least 2 times the inner diameter of the metal inverter tube 6 from the end port of the metal inverter tube 6 communicating with the outside, to ensure the reliability of waterproofing. Further, the entire inner wall of the metal inverter tube 6 may be coated as an option. The length limitation of the waterproof coating can be estimated from the cross-sectional area when the metal inverter tube cross-section changes.

Naturally airing the metal phase inversion tube 6 until airing or putting the metal phase inversion tube into an oven until drying;

the open time can be adjusted according to actual conditions, and the waterproof coating is dried; the temperature and time of drying by adopting the oven can be adjusted according to actual conditions, and the temperature and time can be adjusted when the waterproof coating is dried, and the method is not limited.

A metal inverter tube (as shown in fig. 11) having a waterproof coating uniformly attached to one end face of the outer wall, the inner wall and the outside is obtained.

It will be appreciated that the metal inverter tube may also be coated with a water-repellent coating by other processes, not further limited herein. One end of the processed metal phase inversion tube 6 is mounted on the rear acoustic cavity 12 of the micro-speaker, one end coated with the waterproof coating is communicated with the outside, when the micro-speaker encounters water or falls into water, water contacts the surface of the waterproof coating to form water drops, the water drops are condensed on the tube orifice, and water is blocked from continuously entering the metal phase inversion tube, so that the aim of water prevention is effectively achieved.

The invention also provides an electronic device, which comprises a device shell and the micro-speaker, wherein the micro-speaker is connected with the device shell, and the specific structure of the micro-speaker refers to the embodiment.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but instead should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of completeness. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to forego such subject matter, nor should the applicant be deemed to have such subject matter not considered to be part of the disclosed subject matter.

Claims (10)

1. A micro-speaker, comprising:

the packaging body is provided with a first sound outlet;

the loudspeaker unit is arranged in the packaging body and divides the packaging body into a front sound cavity and a rear sound cavity, and the front sound cavity is communicated with the first sound outlet;

one end of the metal phase inversion tube is communicated with the rear acoustic cavity, the other end of the metal phase inversion tube is communicated with the outside, and a waterproof coating is attached to the end face and/or the inner wall of one end of the metal phase inversion tube communicated with the outside.

2. The micro speaker as set forth in claim 1, wherein the waterproof coating is attached to an inner wall of one end of the metal inverter tube communicating with the outside, and an attachment length of the waterproof coating is greater than 0.5 times an inner diameter of the metal inverter tube; or alternatively, the process may be performed,

the waterproof coating is attached to the inner wall of the entire metal inverter tube.

3. The micro-speaker as set forth in claim 1, wherein the waterproof coating is attached to a part of an end face of one end of the metal inverter tube which communicates with the outside; or alternatively, the process may be performed,

the waterproof coating is attached to all end surfaces of one end of the metal phase inversion tube communicated with the outside.

4. The micro-speaker of claim 1, wherein the metal inverter tube has an inner diameter ranging from 0.05 to 5mm.

5. The micro-speaker of claim 1, wherein the waterproof coating has a thickness ranging from 0.01 to 10um.

6. The micro-speaker of any one of claims 1 to 5, wherein the water-repellent coating surface has a contact angle with water of 90 ° to 180 °.

7. The micro-speaker of claim 6, wherein the contact angle is greater than 120 °.

8. A process for manufacturing a metal inverter tube for use in a micro-speaker as claimed in any one of claims 1 to 7, comprising:

providing a water-repellent coating solution;

immersing the metal inverter tube completely or partially into the waterproof coating solution;

taking out the metal phase inversion tube, naturally airing until airing, or putting the metal phase inversion tube into a baking oven until baking;

the metal phase inversion tube with the waterproof coating uniformly attached to the end face of one end communicated with the outside is obtained.

9. A process for manufacturing a metal inverter tube for use in a micro-speaker as claimed in any one of claims 1 to 7, comprising:

providing a water-repellent coating solution;

dipping waterproof coating solution by a brush, and coating the waterproof coating solution on the inner wall of the metal phase inversion tube and the end face of one end communicated with the outside;

naturally airing the metal phase inversion tube until airing or putting the metal phase inversion tube into an oven until drying;

the metal phase inversion tube with the waterproof coating uniformly attached to the end face of one end communicated with the outside is obtained.

10. An electronic device comprising a device housing and a micro-speaker according to any one of claims 1 to 7, wherein the micro-speaker is connected to the device housing.

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