Spherical dome and processing method thereof, sound production device

Abstract

The application discloses a spherical top, a processing technology thereof and a sound generating device, and is applied to the sound generating device. The spherical top comprises a base layer and an electrophoretic layer. A transition layer is formed on the surface of the base layer. The electrophoretic layer is formed on the side of the transition layer away from the base layer through an electrophoretic process. The application aims to provide a spherical top with good heat dissipation effect. The connection strength and stability between the electrophoretic layer and the base layer for realizing heat dissipation are effectively improved. Meanwhile, the electrophoretic layer can be uniformly coated on the base layer, and the heat dissipation efficiency of the spherical top is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electro-acoustic conversion, in particular to a ball top, a processing technology thereof and a sound production device using the ball top. BACKGROUND

[0002] With the rapid development of smart phones, the application scenarios of mobile phones are becoming more and more extensive, and users have higher and higher requirements for mobile phones in all aspects. Playing games, watching movies, and enjoying music all require high-quality sound effects. This puts higher requirements on the micro sound production device carried by the mobile phone. Large volume, stereo, small size, and excellent sound quality. To meet this demand, micro sound production devices with small cavities, large amplitudes, and high power have gradually become the mainstream design. Large volume and high loudness are often accompanied by high power. Currently, the power of micro sound production devices is getting higher and higher, and the sound efficiency of the micro sound production device itself is very low, only a few percent, and most of the input power is converted into heat.

[0003] The temperature resistance of each component of the micro sound production device is limited. In order to prevent the micro sound production device from being burned out by high temperature generated during its operation, an intelligent amplifier is usually used to limit and protect the temperature of the micro sound production device. However, this has caused two problems: 1. The capacity of the micro sound production device is limited, and the maximum loudness cannot be fully utilized; 2. Although there is protection, accidents are inevitable. Currently, there are cases where the micro sound production device fails due to excessive temperature on the whole machine. The soundlessness of the micro sound production device caused by such malfunctions is a very serious after-sales problem.

[0004] In the micro sound production device, the heat source is usually the voice coil, and the only direct physical connection with the voice coil is the ball top or the diaphragm. This is one of the main ways for the sound production device to dissipate heat through the ball top. In related technologies, the commonly used ball top is a metal alloy or a composite material of metal and foam. In the face of the increasingly stringent heat dissipation requirements at the present stage, the heat dissipation effect of the traditional material and structure is obviously insufficient. The heat dissipation layer (such as nano-carbon coating) made of high-thermal-conductivity filler and organic resin by coating or spraying will have poor thermal stability of the coating, large interface thermal resistance, and be prone to aging and falling off, especially when applied to irregular ball tops with concave and convex bumps, uniform coating cannot be achieved. SUMMARY

[0005] The main purpose of the present application is to provide a ball top and a processing technology thereof, and a sound production device, aiming to provide a ball top with good heat dissipation effect, which effectively provides the connection strength and stability between the electrophoretic layer and the base layer for improving heat dissipation, and also ensures uniform coating of the electrophoretic layer on the base layer.

[0006] To achieve the above-mentioned purpose, the present application provides a ball top applied to a sound production device, the ball top comprising:

[0007] a base layer, a transition layer is formed on the surface of the base layer; and

[0008] an electrophoretic layer formed on a side of the transition layer opposite to the base layer by an electrophoretic process.

[0009] In an embodiment, the transition layer comprises:

[0010] a frosted layer formed by roughening a surface of the base layer; and

[0011] a phosphating film covering a side of the frosted layer opposite to the base layer.

[0012] In an embodiment, the base layer has a first surface arranged opposite to a second surface, the first surface is configured to connect with a voice coil of the sound generating device, the second surface is formed with the transition layer, and the electrophoretic layer is arranged on a side of the transition layer opposite to the second surface.

[0013] In an embodiment, the transition layer covers an outer surface of the base layer, and the electrophoretic layer covers at least part of the transition layer.

[0014] In an embodiment, the base layer has a first surface arranged opposite to a second surface;

[0015] the electrophoretic layer is formed with a first avoiding hole on the first surface, the electrophoretic layer is formed with a second avoiding hole on the second surface, the first avoiding hole is configured to mount a voice coil of the sound generating device, and the second avoiding hole is configured to connect a diaphragm of the sound generating device.

[0016] In an embodiment, the first avoiding hole is arranged in a ring shape.

[0017] and / or, the second avoiding hole is arranged in a ring shape and located at a periphery of the second surface.

[0018] In an embodiment, the dome is provided with a convex structure, the base layer has a first surface arranged opposite to a second surface;

[0019] the first surface is convex towards a direction away from the second surface to form the convex structure;

[0020] or, the second surface is concave towards the first surface, so that the first surface forms the convex structure.

[0021] In an embodiment, the base layer is made of metal or alloy material.

[0022] The electrophoretic layer is made of structural resin.

[0023] In an embodiment, the structural resin is one or more of an epoxy resin, an acrylic resin, a polyurethane resin, a polyolefin resin, or a modified polymer.

[0024] Alternatively, the structural resin is a high-molecular resin modified to have a positive or negative electric charge.

[0025] In an embodiment, the thermal radiation coefficient of the electrophoretic layer is 0.8-1.

[0026] And / or, the glossiness of the electrophoretic layer is 20GU-80GU.

[0027] And / or, the average roughness Ra of the electrophoretic layer is 0.1-1 μm.

[0028] And / or, the density of the electrophoretic layer is 1 g / cm 3 -1.5 g / cm 3 .

[0029] And / or, the hardness of the electrophoretic layer is ≥3H.

[0030] And / or, the adhesion of the electrophoretic layer to the substrate layer is ≥4b.

[0031] And / or, the thickness of the electrophoretic layer is 5-18 μm.

[0032] The present application also provides a processing method for the dome described above, the steps of which include:

[0033] providing a substrate layer;

[0034] preprocessing the surface of the substrate layer to form a transition layer on the surface of the substrate layer;

[0035] processing an electrophoretic layer on the transition layer using an electrophoretic process to obtain the dome.

[0036] In an embodiment, the step of preprocessing the surface of the substrate layer includes:

[0037] cleaning the surface of the substrate layer;

[0038] acid or alkali washing the surface of the substrate layer to form a frosted layer on the surface of the substrate layer;

[0039] phosphating the frosted layer to form a phosphating film on the frosted layer.

[0040] In an embodiment, the step of cleaning the surface of the substrate layer includes:

[0041] degreasing the surface of the substrate layer;

[0042] water washing the surface of the substrate layer.

[0043] In an embodiment, the step of acid washing or alkali washing the surface of the substrate layer further comprises: water washing the substrate layer after the step of acid washing or alkali washing the surface of the substrate layer.

[0044] In an embodiment, the step of phosphating the sanding layer further comprises: water washing the substrate layer after the step of phosphating the sanding layer.

[0045] In an embodiment, the step of forming the electrophoretic layer on the transition layer by the electrophoretic process further comprises:

[0046] water washing the dome;

[0047] drying the dome.

[0048] The present application further provides a sound generating device, which comprises a magnetic circuit system and a vibration system, the vibration system comprising a diaphragm, a dome and a voice coil, the dome being the dome as described above, the dome being connected to the diaphragm, and the voice coil being connected to the dome.

[0049] The dome of the present application is processed by pre-treating the surface of the substrate layer, so that the surface of the substrate layer is formed with a transition layer, which can ensure the removal of oil stains and impurities on the surface of the substrate layer, improve the characteristics of the surface of the substrate layer through the formed transition layer, and form an electrophoretic layer on the side of the transition layer away from the substrate layer by the electrophoretic process, so as to improve the heat dissipation performance of the surface of the substrate layer by the electrophoretic layer, and improve the adhesion of the electrophoretic layer to the surface of the substrate layer by the combination of the transition layer and the electrophoretic layer, so as to effectively enhance the connection stability between the electrophoretic layer and the substrate layer. At the same time, the electrophoretic layer formed on the side of the transition layer away from the substrate layer by the electrophoretic process is more uniform, so as to ensure the performance of the dome, and the electrophoretic layer has high radiation coefficient and low gloss, so as to effectively improve the heat dissipation performance when the dome is applied to the sound generating device, and ensure the acoustic performance of the sound generating device. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0051] Figure 1 It is a cross-sectional view of the dome in an embodiment of the present application.

[0052] Figure 2 It is a cross-sectional view of the dome in an embodiment of the present application.Figure 1 Structure diagram of the first surface of the middle ball top;

[0053] Figure 3 Structure diagram of the second surface of the middle ball top; Figure 1 Structure diagram of the second surface of the middle ball top;

[0054] Figure 4 Structure diagram of the second surface of the middle ball top;

[0055] Figure 5 Structure diagram of the second surface of the middle ball top;

[0056] Figure 6 Structure diagram of the second surface of the middle ball top;

[0057] Figure 7 Structure diagram of the second surface of the middle ball top;

[0058] BRIEF DESCRIPTION OF THE DRAWINGS

[0059]

[0060]

[0061] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0062] The technical solutions in the embodiments of the present application will be apparently and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work under the premise that the relative positions, movement conditions and the like between the components are explained in a certain posture (as shown in the drawings) belong to the protection scope of the present application.

[0063] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0064] Meanwhile, the meaning of "and / or" or "and / or" in the whole text is that three schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0065] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0066] The present application provides a ball top 1, which is applied to a sound generating device. It can be understood that the sound generating device comprises a magnetic circuit system and a vibration system 100, the vibration system 100 comprises a diaphragm 3, a ball top 1 connected to the diaphragm 3 and a voice coil 2 driving the diaphragm 3 and the ball top 1 to vibrate and generate sound, and the magnetic circuit system provides a magnetic field for the voice coil 2 to drive the voice coil 2 to drive the diaphragm 3 and the ball top 1 to vibrate and generate sound.

[0067] In the embodiment, the ball top 1 is arranged at the center of the diaphragm 3, so as to strengthen the structural strength of the diaphragm 3 by the ball top 1. It can be understood that in order to reduce the weight of the diaphragm 3, the center of the diaphragm 3 is provided with a hollow structure, and the ball top 1 is connected to the center of the diaphragm 3 and covers the hollow structure of the diaphragm 3, so as to strengthen the structural strength of the diaphragm 3 and also play a dustproof role.

[0068] It can be understood that in order to better dissipate the heat generated by the voice coil 2, the ball top 1 is arranged between the diaphragm 3 and the voice coil 2, so that the voice coil 2 is connected with the ball top 1, so as to realize rapid heat dissipation by the electrophoretic layer 13 of the ball top 1 and improve the heat dissipation effect. Of course, in other embodiments, the ball top 1 can also be arranged on the side of the diaphragm 3 away from the voice coil 2, which is not limited here.

[0069] Please refer to Figures 1 to 7 It can be understood that in order to better dissipate the heat generated by the voice coil 2, the ball top 1 is arranged between the diaphragm 3 and the voice coil 2, so that the voice coil 2 is connected with the ball top 1, so as to realize rapid heat dissipation by the electrophoretic layer 13 of the ball top 1 and improve the heat dissipation effect. Of course, in other embodiments, the ball top 1 can also be arranged on the side of the diaphragm 3 away from the voice coil 2, which is not limited here.

[0070] In the embodiment, the base layer 11 is the main structure of the ball top 1, and the base layer 11 can be a conductive material. The material of the base layer 11 can be metal or alloy material, such as aluminum magnesium alloy, etc., which is not limited here.

[0071] In the embodiment, the surface of the base layer 11 is pretreated to form the transition layer 12. Alternatively, the transition layer 12 is a part of the base layer 11. It is understood that the surface of the base layer 11 is subjected to degreasing and water washing to remove impurities or grease on the surface of the base layer 11, so as to improve the adhesion or bonding force between the surface of the base layer 11 and the electrophoretic layer 13, thereby improving the connection stability between the surface of the base layer 11 and the electrophoretic layer 13.

[0072] It is understood that the surface of the base layer 11 is subjected to pickling or alkaline washing, and the acid or alkali liquid on the surface of the base layer 11 is washed with water to adjust the surface of the base layer 11. It should be noted that when the surface of the base layer 11 is subjected to pickling or alkaline washing, the surface of the base layer 11 can be corroded or eroded by the acid or alkali liquid to produce a uniform erosion surface on the surface of the base layer 11, that is, to form a matte surface or a frosted surface, so that the oxide film on the surface of the base layer 11 can be completely removed after treatment to form a uniform activated surface, thereby making the surface of the base layer 11 flat and removing surface scratches and other marks, and improving the bonding force between the surface of the base layer 11 and the electrophoretic layer 13.

[0073] Of course, in order to further improve the bonding force between the surface of the base layer 11 and the electrophoretic layer 13, the surface of the base layer 11 subjected to pickling or alkaline washing can also be subjected to phosphating treatment in the embodiment, so that a very thin and dense phosphating film with fine grains is formed on the surface subjected to phosphating treatment, thereby further increasing the bonding force with the electrophoretic layer 13 by using the phosphating film, so that the electrophoretic layer 13 is not easy to peel off or separate from the surface of the base layer 11. The ball top 1 can be applied to various complex high and low temperature, high and low humidity environments and foreign object scratching and other various scenes.

[0074] In the embodiment, the electrophoretic layer 13 is formed on the side of the transition layer 12 away from the base layer 11 by an electrophoresis process. The electrophoretic layer 13 formed by the electrophoresis process can effectively ensure the uniformity of the electrophoretic layer 13, that is, the thickness of the electrophoretic layer 13 formed on the surface of the base layer 11 is uniform, thereby controlling the thickness of the electrophoretic layer 13 to improve the heat dissipation effect. At the same time, in the process of forming the electrophoretic layer 13 by the electrophoresis process, the base layer 11 of the ball top 1 is used as a cathode electrophoresis, so that the base layer 11 does not dissolve when the electrophoretic layer 13 is formed, and the adhesion force between the electrophoretic layer 13 and the base layer 11 is high. The greater the adhesion force, the better the bonding force between the electrophoretic layer 13 and the base layer 11, which is beneficial to the direct heat conduction between the base layer 11 and the electrophoretic layer 13 of the ball top 1.

[0075] Optionally, the material of the electrophoretic layer 13 is a structural resin. Optionally, the structural resin is one or more of an epoxy resin, an acrylic resin, a polyurethane resin, a polyolefin resin, or a modified polymer. Of course, the structural resin is a high-molecular resin modified to have a positive or negative electric charge.

[0076] As can be understood, the epoxy resin has high adhesion and excellent corrosion resistance as the structural resin. The electrophoretic layer 1 can be black, white, blue, yellow, etc. Optionally, the electrophoretic layer 1 is black. The black electrophoretic layer 1 composed of carbon black has high emissivity.

[0077] As can be understood, during the electrophoretic process, the surface of the base layer 11 undergoes an electrochemical reaction. Under the action of an applied current, the reaction first occurs at the edges and corners of the surface of the base layer 11. When the electrophoretic layer 13 reaches a certain thickness, the location has insulation, and the electric field moves with the coated surface until the entire surface of the base layer 11 has a uniform thickness of the electrophoretic layer 13.

[0078] It should be noted that when the electrophoretic layer 13 is thin, the emissivity increases rapidly with the increase in thickness. When the electrophoretic layer 13 continues to thicken, the emissivity is basically stable. If the thickness of the electrophoretic layer 13 is too thick, the overall thermal conductivity of the product decreases, which is not conducive to heat dissipation. In this embodiment, the thickness of the electrophoretic layer 13 is in the range of 5 μm to 18 μm. Optionally, the thickness of the electrophoretic layer 13 is 5 μm, 8 μm, 10 μm, 13 μm, 15 μm, 18 μm, etc., which is not limited herein.

[0079] The dome 1 of the present application is processed by pre-treating the surface of the base layer 11, so that the surface of the base layer 11 forms a transition layer 12. In this way, the oil stains and impurities on the surface of the base layer 11 can be removed, the properties of the surface of the base layer 11 are improved by the formed transition layer 12, and the electrophoretic layer 13 is formed on the side of the transition layer 12 away from the base layer 11 by the electrophoretic process. Thus, the heat dissipation performance of the surface of the base layer 11 is improved by the electrophoretic layer 13, and the adhesion of the electrophoretic layer 13 to the surface of the base layer 11 is improved by the combination of the transition layer 12 and the electrophoretic layer 13, thereby effectively enhancing the connection stability between the electrophoretic layer 13 and the base layer 11. At the same time, the electrophoretic layer 13 formed on the side of the transition layer 12 away from the base layer 11 is more uniform, which ensures the performance of the dome 1, and the electrophoretic layer 13 has high emissivity and low gloss. Thus, when the dome 1 is applied to a sound generating device, the heat dissipation performance is effectively improved, and the acoustic performance of the sound generating device is ensured.

[0080] In an embodiment, the thermal radiation coefficient of the electrophoretic layer 13 is 0.8-1. Alternatively, the thermal radiation coefficient of the electrophoretic layer 13 is 0.8, 0.85, 0.9, 0.95, 1, etc., which are not limited herein. It can be understood that the greater the thermal radiation coefficient of the electrophoretic layer 13, the better the heat dissipation performance of the material.

[0081] It can be understood that the electrophoretic layer 13 has the characteristics of low gloss, that is, the electrophoretic layer 13 has a lower gloss. In the embodiment, the gloss of the electrophoretic layer 13 is 20GU-80GU. Alternatively, the gloss of the electrophoretic layer 13 is 20GU, 25GU, 30GU, 35GU, 40GU, 45GU, 50GU, 55GU, 60GU, 65GU, 70GU, 75GU, 80GU, etc., which are not limited herein. The smaller the gloss, the less the infrared light is reflected, the more the infrared light is absorbed, the temperature is stable, the absorption and radiation are equal, the more the radiation, and the greater the thermal radiation coefficient.

[0082] In an embodiment, the average roughness Ra of the electrophoretic layer 13 is 0.1 μm-1 μm. Alternatively, the average roughness Ra of the electrophoretic layer 13 is 0.1 μm, 0.2 μm, 0.3 μm, 0.4 μm, 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, 0.9 μm, 1 μm, etc., which are not limited herein. It can be understood that a higher roughness, for a rough surface, electromagnetic waves are reflected multiple times on the uneven surface, increasing the opportunity for the object surface to absorb heat rays, thereby improving heat radiation.

[0083] Alternatively, the density of the electrophoretic layer 13 is 1 g / cm 3 -1.5 g / cm 3 . It can be understood that the smaller the density of the electrophoretic layer 13, the smaller the weight change of the ball top 1, thereby having a small effect on the performance. Alternatively, the density of the electrophoretic layer 13 is 1 g / cm 3 , 1.1 g / cm 3 , 1.2 g / cm 3 , 1.3 g / cm 3 , 1.4 g / cm 3 , 1.5 g / cm 3 , etc., which are not limited herein.

[0084] In an embodiment, the hardness of the electrophoretic layer 13 is ≥3H. It can be understood that the electrophoretic layer 13 has a higher hardness, good scratch resistance, and plays a surface protection role on the base layer 11 of the ball top 1, improves the overall rigidity of the ball top 1, and avoids scratching the base layer 11 by sharp objects.

[0085] In an embodiment, the adhesion between the electrophoretic layer 13 and the substrate layer 11 is greater than or equal to 4b. It can be appreciated that the transition layer 12 is formed by pre-treating the surface of the substrate layer 11, so that the surface of the substrate layer 11 is combined with the electrophoretic layer 13 by the transition layer 12, thereby ensuring the tightness of the combination between the substrate layer 11 and the electrophoretic layer 13.

[0086] It should be noted that the pre-treatment of the surface of the substrate layer 11 can remove the original oil stains, impurities, defects, etc. on the surface of the substrate layer 11, increase the surface roughness of the transition layer 12 on the surface of the substrate layer 11, and thus effectively avoid the influence of impurities on the heat transfer efficiency between the layers.

[0087] In an embodiment, the transition layer 12 includes a frosted layer 121 and a phosphating film 122, wherein the frosted layer 121 is formed by roughening the surface of the substrate layer 11, and the phosphating film 122 covers one side of the frosted layer 121 away from the substrate layer 11.

[0088] In the present embodiment, the frosted layer 121 is formed on the surface of the substrate layer 11 by roughening the surface of the substrate layer 11, that is, the frosted layer 121 is part of the substrate layer 11. It can be appreciated that the roughening of the surface of the substrate layer 11 can be a physical roughening process, for example, using a frosted workpiece to polish.

[0089] Of course, the roughening of the surface of the substrate layer 11 can also be carried out by a chemical process, for example, by using an acid pickling or alkaline pickling step. It can be appreciated that when the surface of the substrate layer 11 is treated by acid pickling or alkaline pickling, the surface of the substrate layer 11 can be corroded or eroded by an acid or an alkali, so as to produce a uniform eroded surface on the surface of the substrate layer 11, that is, to form a matte surface or a frosted surface, so that the oxide film on the surface of the substrate layer 11 can be completely removed after treatment, forming a uniform activated surface, thereby making the surface of the substrate layer 11 smooth and removing surface scratches and other marks, and improving the adhesion between the surface of the substrate layer 11 and the electrophoretic layer 13.

[0090] In the present embodiment, the phosphating film 122 can be formed by a phosphating process and covers one side of the frosted layer 121 away from the substrate layer 11. It can be appreciated that the surface treated by phosphating forms a very thin and dense phosphating film with fine grains, thereby further increasing the adhesion between the phosphating film and the electrophoretic layer 13, so that the electrophoretic layer 13 is not easy to peel off or separate from the surface of the substrate layer 11.

[0091] In an embodiment, the transition layer 12 is coated on the outer surface of the base layer 11, and the electrophoretic layer 13 covers at least part of the transition layer 12. It can be understood that by coating the surface of the base layer 11 of the dome 1 in contact with air with the electrophoretic layer 13, the high thermal radiation coefficient and high heat dissipation effect of the electrophoretic layer 13 are utilized, and the electrophoretic layer 13 is not arranged in the area in contact with the heat source (voice coil), thereby enhancing the heat conduction of the voice coil 2 in direct contact with the base layer 11 of the dome 1, so that the heat dissipation effect is further improved.

[0092] In an embodiment, as shown in Figure 4 and Figure 5 , the base layer 11 has a first surface 111 arranged opposite and a second surface 112, the first surface 111 is used to connect with the voice coil 2 of the sound generating device, and the second surface 112 is formed with the transition layer 12, and the electrophoretic layer 13 is arranged on the side of the transition layer 12 away from the second surface 112.

[0093] It can be understood that the base layer 11 can be a plate structure, and the two surfaces of the base layer 11 are the first surface 111 and the second surface 112, respectively. By forming the transition layer 12 on the second surface 112 and arranging the electrophoretic layer 13 on the side of the transition layer 12 away from the second surface 112, and connecting the first surface 111 with the voice coil 2 of the sound generating device, the heat generated by the voice coil 2 can be conducted to the base layer 11, and then the heat can be radiated outward by the transition layer 12 and the electrophoretic layer 13 on the second surface 112, so as to achieve the effect and purpose of rapid heat dissipation.

[0094] In another embodiment, as shown in Figures 1 to 3 , Figure 6 and Figure 7 , the base layer 11 has a first surface 111 arranged opposite and a second surface 112; the electrophoretic layer 13 is formed with a first avoiding hole 1111 on the first surface 111, and the electrophoretic layer 13 is formed with a second avoiding hole 1121 on the second surface 112, the first avoiding hole 1111 is used to install the voice coil 2 of the sound generating device, and the second avoiding hole 1121 is used to connect the diaphragm 3 of the sound generating device.

[0095] In this embodiment, the electrophoretic layer 13 completely covers the outside of the base layer 11. The base layer 11 can be a plate structure, and at this time, the first surface 111 (lower surface), the second surface 112 (upper surface) of the base layer 11 and the side surface connecting the first surface 111 and the second surface 112 are all formed with the transition layer 12, and the electrophoretic layer 13 completely covers the first surface 111, the second surface 112 and the side surface.

[0096] It can be understood that by forming the electrophoretic layer 13 with the first avoiding hole 1111 on the first surface 111, the first avoiding hole 1111 is used for mounting the voice coil 2 of the sound generating device, so that the voice coil 2 is in direct contact with the base layer 11 of the ball top 1 through the first avoiding hole 1111 for heat conduction. By forming the electrophoretic layer 13 with the second avoiding hole 1121 on the second surface 112, the second avoiding hole 1121 is used for connecting the diaphragm 3 of the sound generating device, so that the diaphragm 3 is in direct contact with the base layer 11 of the ball top 1 through the second avoiding hole 1121 for heat conduction, which not only increases the radiation area of the electrophoretic layer 13, but also further improves the heat dissipation effect.

[0097] In the embodiment, the transition layer 12 is formed on the surface of the base layer 11, so that the transition layer 12 is exposed to the first avoiding hole 1111 and the second avoiding hole 1121, and the voice coil 2 and the diaphragm 3 are bonded to the transition layer 12 by glue to realize connection and fixation with the base layer 11. It can be understood that the surface of the base layer 11 is preprocessed to form the transition layer 12, so that the transition layer 12 effectively removes oil stains, impurities, material defects and the like on the surface of the base layer 11, which helps the connection of the voice coil 2 and the diaphragm 3 and the like to the base layer 1111 by glue and the like to improve the bonding effect and improve the bonding force.

[0098] Optionally, the first avoiding hole 1111 is annularly arranged. The shape profile of the first avoiding hole 1111 is the same as the shape profile of the voice coil 2. Optionally, the first avoiding hole 1111 is a circular ring structure, an elliptical ring structure, a square ring structure, etc., which is not limited herein.

[0099] Optionally, the second avoiding hole 1121 is annularly arranged and located at the periphery of the second surface 112. The shape profile of the second avoiding hole 1121 is the same as the shape profile of the hollow structure of the diaphragm 3. Optionally, the second avoiding hole 1121 is a circular ring structure, an elliptical ring structure, a square ring structure, etc., which is not limited herein. It can be understood that by arranging the second avoiding hole 1121 at the periphery of the second surface 112, the diaphragm 3 is conveniently connected with the ball top 1, and the electrophoretic layer 13 of the ball top 1 is maximally contacted with air, thereby improving the heat dissipation effect.

[0100] In an embodiment, the ball top 1 is provided with a protruding structure 14. It can be understood that by forming the protruding structure 14 on the ball top 1, the structure strength of the ball top 1 is strengthened by the protruding structure 14.

[0101] In the embodiment, the base layer 11 has a first surface 111 and a second surface 112 arranged oppositely. Optionally, the first surface 111 is protruded towards the direction away from the second surface 112 to form the protruding structure 14. It can be understood that the thickness of the ball top 1 at the protruding structure 14 is greater than the thickness of other parts.

[0102] As shown in Figures 1 to 7 The second surface 112 is concave towards the first surface 111, so that the first surface 111 forms a convex structure 14. It can be understood that the thickness of the ball top 1 is uniform at different positions.

[0103] The application further provides a processing technology of the ball top 1. The ball top 1 is specifically configured as the above-mentioned embodiments. The processing technology of the ball top 1 adopts all the technical solutions of the above-mentioned embodiments, and thus has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0104] The processing technology of the ball top 1 comprises the following steps:

[0105] providing a base layer 11;

[0106] preprocessing the surface of the base layer 11 to form a transition layer 12 on the surface of the base layer 11;

[0107] adopting an electrophoresis process to process and form an electrophoresis layer 13 on the transition layer 12 to obtain the ball top 1.

[0108] In the embodiment, the base layer 11 is the main structure of the ball top 1. The base layer 11 can be made of metal. The material of the base layer 11 is metal or alloy material, for example, aluminum-magnesium alloy, which is not limited here. It can be understood that the base layer 11 can be a single-layer structure or a multi-layer structure, which is not limited here.

[0109] It can be understood that the surface of the base layer 11 is preprocessed to form the transition layer 12. Alternatively, the transition layer 12 is part of the base layer 11. In the embodiment, the step of preprocessing the surface of the base layer 11 comprises degreasing treatment and water washing treatment, which removes impurities or grease on the surface of the base layer 11, so as to improve the adhesion or bonding force between the surface of the base layer 11 and the electrophoresis layer 13, thereby improving the connection stability between the surface of the base layer 11 and the electrophoresis layer 13.

[0110] In the embodiment, the step of pre-treating the surface of the base layer 11 further comprises: performing an acid washing or alkali washing treatment. It can be understood that by acid washing or alkali washing the surface of the base layer 11, the surface of the base layer 11 is cleaned by the acid or alkali solution to adjust the surface of the base layer 11. It should be noted that when the surface of the base layer 11 is acid washed or alkali washed, the surface of the base layer 11 can be corroded or eroded by the acid or alkali solution to produce a uniform erosion surface on the surface of the base layer 11, that is, to form a matte surface or a frosted surface, so that after the treatment, the oxide film on the surface of the base layer 11 can be completely removed to form a uniform activated surface, thereby making the surface of the base layer 11 flat and removing surface scratches and other marks, and improving the adhesion of the surface of the base layer 11 to the electrophoretic layer 13.

[0111] It can be understood that the step of pre-treating the surface of the base layer 11 further comprises: phosphating treatment. The surface of the base layer 11 after acid washing or alkali washing treatment is subjected to phosphating treatment, so that a very thin and fine-grained and dense phosphating film is formed on the surface after phosphating treatment, thereby further increasing the adhesion to the electrophoretic layer 13 by the phosphating film, so that the electrophoretic layer 13 is not easily peeled or separated from the surface of the base layer 11. The ball 1 can be applied to various complex high and low temperature, high and low humidity environments and foreign object scratching and other various scenes.

[0112] In the embodiment, the transition layer 12 formed on the surface of the base layer 11 comprises a frosted layer 121 and a phosphating film 122. It can be understood that the frosted layer 121 is formed on the surface of the base layer 11 by roughening the surface of the base layer 11, that is, the frosted layer 121 is part of the base layer 11. Roughening the surface of the base layer 11 can be physical roughening, such as using a frosted workpiece to polish.

[0113] Of course, roughening the surface of the base layer 11 can also be performed by a chemical process, such as an acid washing or alkali washing step. It can be understood that when the surface of the base layer 11 is acid washed or alkali washed, the surface of the base layer 11 can be corroded or eroded by the acid or alkali solution to produce a uniform erosion surface on the surface of the base layer 11, that is, to form a matte surface or a frosted surface, so that after the treatment, the oxide film on the surface of the base layer 11 can be completely removed to form a uniform activated surface, thereby making the surface of the base layer 11 flat and removing surface scratches and other marks, and improving the adhesion of the surface of the base layer 11 to the electrophoretic layer 13.

[0114] In the embodiment, the phosphating film 122 can be formed by a phosphating process and covers the side of the frosted layer 121 away from the substrate layer 11. It can be understood that the surface after phosphating treatment forms an extremely thin and dense phosphating film with fine grains, thereby further increasing the adhesion with the electrophoretic layer 13, so that the electrophoretic layer 13 is not easy to peel off or separate from the surface of the substrate layer 11.

[0115] In the embodiment, the electrophoretic layer 13 is formed on the side of the transition layer 12 away from the substrate layer 11 by an electrophoresis process. The electrophoretic layer 13 formed by the electrophoresis process can effectively ensure the uniformity of the electrophoretic layer 13, that is, the thickness of the electrophoretic layer 13 formed on the surface of the substrate layer 11 is uniform, thereby controlling the thickness of the electrophoretic layer 13 to improve the heat dissipation effect. At the same time, in the process of forming the electrophoretic layer 13 by the electrophoresis process, the substrate layer 11 of the ball top 1 is used as a cathode electrophoresis, so that no dissolution of the substrate layer 11 occurs when the electrophoretic layer 13 is formed, and the adhesion of the electrophoretic layer 13 to the substrate layer 11 is high. The greater the adhesion, the better the adhesion of the electrophoretic layer 13 to the substrate layer 11, which is beneficial to the direct heat conduction between the substrate layer 11 and the electrophoretic layer 13 of the ball top 1.

[0116] It can be understood that the electrophoretic paint in the electrophoresis tank during the electrophoresis process mainly consists of structural resin, crosslinking resin, neutralizing agent, solvent, deionized water and pigment or dye. Optionally, the structural resin is a high molecular resin modified with positive or negative charges, and the proportion of the structural resin is 10-30 wt.%. The pigment or dye of the electrophoretic paint can be black, white, blue, yellow, etc. The black electrophoretic layer 13 composed of carbon black has a high emissivity.

[0117] In an embodiment, the step of pretreating the surface of the substrate layer 11 includes:

[0118] cleaning the surface of the substrate layer 11;

[0119] acid or alkali washing the surface of the substrate layer 11 to form a frosted layer 121 on the surface of the substrate layer 11;

[0120] phosphating the frosted layer 121 to form a phosphating film 122 on the frosted layer 121.

[0121] It can be understood that cleaning the surface of the substrate layer 11 removes impurities or grease on the surface of the substrate layer 11, thereby improving the adhesion or bonding force between the surface of the substrate layer 11 and the electrophoretic layer 13, and improving the connection stability between the surface of the substrate layer 11 and the electrophoretic layer 13. In the embodiment, the step of cleaning the surface of the substrate layer 11 includes: degreasing the surface of the substrate layer 11; and washing the surface of the substrate layer 11. In this way, impurities or grease on the surface of the substrate layer 11 can be effectively removed.

[0122] In the embodiment, the surface of the base layer 11 is subjected to acid or alkali washing treatment, and the surface of the base layer 11 is corroded or eroded by acid or alkali solution to form a uniform eroded surface on the surface of the base layer 11, i.e. a matte surface. After the treatment, the oxide film on the surface of the base layer 11 is completely removed to form a uniform activated surface, so that the surface of the base layer 11 is leveled and surface scratches are removed, and the adhesion between the surface of the base layer 11 and the electrophoretic layer 13 is improved.

[0123] In an embodiment, the step of subjecting the surface of the base layer 11 to acid or alkali washing treatment further comprises: subjecting the base layer 11 to water washing treatment. It can be understood that in this way, the acid or alkali solution remaining in the acid or alkali washing process can be washed away by water.

[0124] In the embodiment, the matte layer 121 is subjected to phosphating treatment, so that the surface after phosphating treatment forms a very thin and dense phosphating film with fine grains, thereby further increasing the adhesion between the phosphating film and the electrophoretic layer 13, so that the electrophoretic layer 13 is not easy to peel off or separate from the surface of the base layer 11. The ball top 1 can be applied to various complex high and low temperature, high and low humidity environments and foreign object scratching and other various scenes.

[0125] In an embodiment, the step of subjecting the matte layer 121 to phosphating treatment further comprises: subjecting the base layer 11 to water washing treatment. It can be understood that in this way, the liquid or treatment substance remaining in the phosphating process can be washed away by water, which is not limited here.

[0126] In an embodiment, the step of forming the electrophoretic layer 13 on the transition layer 12 by electrophoresis further comprises:

[0127] water washing treatment of the ball top 1;

[0128] drying treatment of the ball top 1.

[0129] In the embodiment, after the electrophoretic layer 13 is formed by the electrophoresis process, the water washing process is used to effectively remove the excess liquid or treatment substance on the surface of the ball top 1. Then, drying is performed to further solidify the electrophoretic layer 13 and strengthen the connection stability between the electrophoretic layer 13 and the base layer 11.

[0130] The application also provides a sound generating device comprising the ball top 1 described above. The specific structure of the ball top 1 is referred to the foregoing embodiments. Since the sound generating device adopts all the technical solutions of the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be repeated here.

[0131] In the embodiment, as shown in Figure 6 and Figure 7As shown, the sound production device comprises a magnetic circuit system and a vibration system 100, the vibration system 100 comprises a diaphragm 3, a dome 1 and a voice coil 2, the dome 1 is connected to the diaphragm 3, the voice coil 2 is connected to the dome 1, the magnetic circuit system provides a magnetic field for the voice coil 2, so that the voice coil 2 vibrates in the magnetic field formed by the magnetic circuit system, to drive the dome 1 and the diaphragm 3 to vibrate and produce sound. It can be understood that the magnetic circuit system is provided with a magnetic gap, and one end of the voice coil 2 away from the dome 1 is suspended in the magnetic gap.

[0132] It can be understood that the magnetic circuit system comprises a magnetic yoke, a center magnetic circuit part and a side magnetic circuit part arranged on the magnetic yoke, the side magnetic circuit part is located outside the center magnetic circuit part and is spaced from the center magnetic circuit part to form a magnetic gap. Alternatively, the center magnetic circuit part and the side magnetic circuit part each comprise a magnet and a mu-metal arranged in layers.

[0133] In the embodiment, the sound production device comprises a shell accommodating and fixing the magnetic circuit system and the vibration system 100. The magnetic circuit system and the vibration system 100 are connected to the shell, and the diaphragm 3 of the vibration system 100 is opposite to and spaced from the magnetic circuit system.

[0134] The application also provides an electronic device, which comprises a device shell and the sound production device described above, and the sound production device is arranged in the device shell. The specific structure of the sound production device is referred to the foregoing embodiments. Since the electronic device adopts all the technical solutions of the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be repeated here.

[0135] It can be understood that the electronic device can be a mobile phone, a headset, a sound box, a smart TV, etc., which is not limited here.

[0136] The above is only an optional embodiment of the application, and does not limit the patent scope of the application. Any equivalent structural transformation made according to the content of the application specification and drawings, or direct / indirect application in other related technical fields within the concept of the application is included in the patent protection scope of the application.

Claims

1. A sound producing device, characterized by, The sound production device comprises a magnetic circuit system and a vibration system, the vibration system comprises a diaphragm, a dome and a voice coil, the dome is connected to the diaphragm, the voice coil is connected to the dome, the magnetic circuit system is provided with a magnetic gap, and one end of the voice coil away from the dome is suspended in the magnetic gap; The dome comprises: a base layer made of conductive material, a transition layer formed on the surface of the base layer, the transition layer comprising a frosted layer and a phosphating film, the frosted layer being formed by roughening the surface of the base layer, the phosphating film being covered on the side of the frosted layer away from the base layer, the base layer having a first surface and a second surface arranged oppositely; and an electrophoretic layer formed on the side of the transition layer away from the base layer by an electrophoresis process, the electrophoretic layer being made of a structural resin, the structural resin being a modified high-molecular resin with positive charge; the electrophoretic layer completely covering the outside of the base layer, the electrophoretic layer having a first avoiding hole formed on the first surface and a second avoiding hole formed on the second surface, the first avoiding hole being used for mounting the voice coil of the sound production device, and the second avoiding hole being used for connecting the diaphragm of the sound production device; wherein, in the process of forming the electrophoretic layer by the electrophoresis process, the base layer serves as a cathode electrophoresis; wherein, the frosted layer is formed by pickling or alkaline cleaning the surface of the base layer, the dome is provided with a convex structure, the first surface is convex in the direction away from the second surface to form the convex structure; or, the second surface is concave towards the first surface, so that the first surface forms the convex structure.

2. The sound production device of claim 1, wherein, The first avoiding hole is arranged in a ring shape; and / or, the second avoiding hole is arranged in a ring shape and located at the circumference of the second surface.

3. Sound production device according to claim 1 or 2, characterized in that The base layer is made of metal or alloy material.

4. The sound production device of claim 3, wherein, The structural resin is one or more of epoxy resin, acrylic resin, polyurethane resin, polyolefin resin or modified polymer.

5. The sound production device of claim 1 or 2, wherein The heat radiation coefficient of the electrophoretic layer is 0.8-1; and / or, the glossiness of the electrophoretic layer is 20GU-80GU; and / or, the average roughness Ra of the electrophoretic layer is 0.1-1μm; and / or, the density of the electrophoretic layer is 1-1.5g / cm3; and / or, the hardness of the electrophoretic layer is ≥3H; and / or, the adhesion of the electrophoretic layer to the base layer is ≥4b; and / or, the thickness of the electrophoretic layer is 5-18μm.

6. A process for machining a ball tip of a sound producing device as claimed in any one of claims 1 to 5, characterized in that, The steps of the processing process comprise: providing a base layer; pretreating the surface of the base layer to form a transition layer on the surface of the base layer; processing and forming an electrophoretic layer on the transition layer by an electrophoresis process, the electrophoretic layer being made of a structural resin to obtain a dome; wherein, the step of pretreating the surface of the base layer comprises: cleaning the surface of the base layer; pickling or alkaline cleaning the surface of the base layer to form a frosted layer on the surface of the base layer; phosphating the frosted layer to form a phosphating film on the frosted layer.

7. The process of machining a ball nose of a sound producing device as claimed in claim 6, wherein, The step of cleaning the surface of the base layer comprises: performing a degreasing treatment on the surface of the base layer; performing a water washing treatment on the surface of the base layer.

8. The process of machining a ball nose of a sound producing device as claimed in claim 6, wherein, The step of performing an acid or alkali washing treatment on the surface of the base layer further comprises: performing a water washing treatment on the base layer after the step of performing a phosphating treatment on the surface of the sanding layer.

9. The process of machining a ball nose of a sound producing device as claimed in claim 6, wherein, The step of forming an electrophoretic layer on the transition layer by using an electrophoretic process further comprises: performing a water washing treatment on the ball top; performing a drying treatment on the ball top.

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