WO2021127897A1

WO2021127897A1 - Voice coil bobbin

Info

Publication number: WO2021127897A1
Application number: PCT/CN2019/127578
Authority: WO
Inventors: 肖波; 周家盛
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2021-07-01

Abstract

The present utility model provides a voice coil bobbin, which is applied to a sound production device. The sound production device comprises a basket, a magnetic circuit system accommodated in the basket and a vibration system fixedly held in the basket. The vibration system comprises a diaphragm of which the periphery is fixedly held in the basket and a voice coil driving the diaphragm to vibrate, and the voice coil bobbin covers the voice coil and is connected to the voice coil and the diaphragm. The voice coil bobbin comprises a voice coil bobbin main body glued to the voice coil, two heat conduction force arms extending outwards from the two ends of the voice coil bobbin main body, and bobbin heat dissipation portions connected to the heat conduction force arms. The bobbin heat dissipation portions are embedded in the basket, and at least a part of each bobbin heat dissipation portion is exposed out of the basket. According to the present utility model, by means of the two heat conduction force arms, heat generated by the voice coil when the sound production device operates can be transmitted to the outside of the voice coil, thereby effectively controlling the temperature of the voice coil, and avoiding the problem that the voice coil generates heat to cause faults of the sound production device.

Description

A voice coil skeleton

Technical field

The utility model relates to an acoustic electric energy converter, in particular to a voice coil skeleton.

Background technique

The electric sound generating device in the prior art usually consists of a basin frame, a magnetic circuit system and a vibration system. When the sound device is working, the high-frequency current passes through the voice coil of the magnetic circuit system to generate a magnetic field, which drives the voice coil to vibrate, thereby driving the diaphragm of the vibration system to vibrate. When a high-frequency current passes through the voice coil to generate a magnetic field, the heating of the voice coil cannot be avoided. In addition, the high temperature caused by excessive power can easily cause various failures of the sound device, such as disconnection and silence. Moreover, if the voice coil is kept at a high temperature for a long time, it will also affect the life of the sound generating device.

Therefore, it is necessary to provide a heat dissipation device for the voice coil to reduce the degree of heat generation of the voice coil.

technical problem

The purpose of the utility model is to provide a voice coil skeleton to solve the problem that the voice coil heats up and causes the sound emitting device to malfunction when the sound emitting device in the prior art works.

Technical solutions

The technical scheme of the utility model is as follows: the utility model provides a voice coil skeleton, which is applied to a sound generating device, the sound generating device includes a basin frame, a magnetic circuit system housed in the basin frame, and a vibration system fixed on the basin frame, The vibration system includes a diaphragm with a periphery fixed on the frame and a voice coil that drives the diaphragm to vibrate, and is characterized in that:

The voice coil skeleton covers the voice coil and connects the voice coil and the diaphragm;

The voice coil skeleton includes a voice coil skeleton main body glued to the voice coil, two heat conduction arms extending outward from both ends of the voice coil skeleton main body, and a skeleton heat sink connected to the heat conduction arms, The frame heat dissipation part is embedded in the basin frame and is at least partially exposed from the basin frame.

Further, a hollow pattern is provided on the heat conduction arm.

Further, the heat dissipation portion of the frame is folded from an end of the heat conduction arm away from the main body of the voice coil frame, and is exposed on the side surface of the basin frame.

Further, the frame heat dissipation portion is perpendicular to the heat conduction arm.

Further, the frame heat dissipation part is injection molded into the basin frame.

Further, the main body of the voice coil skeleton includes a glued part that fixes the voice coil and a support part that supports the diaphragm and is connected to the glued part.

Further, the glued part has a ring structure and is arranged around the voice coil.

Further, the voice coil skeleton is a thin metal sheet.

Beneficial effect

The beneficial effect of the utility model is that the structure of the voice coil skeleton is expanded. The provided voice coil skeleton includes a main body of the voice coil skeleton, two heat conduction arms extending from the main body of the voice coil skeleton, and a skeleton connected with the heat conduction arms The heat dissipation part, the frame heat dissipation part is embedded in the basin frame and is at least partially exposed to the basin frame. The heat conduction arm and the heat dissipating part of the frame at both ends of the voice coil bobbin can transfer the heat generated by the voice coil to the outside of the voice coil when the generator is working, thereby effectively controlling the voice coil temperature.

Description of the drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a sound emitting device provided by an embodiment of the utility model;

2 is an exploded schematic diagram of the three-dimensional structure of the sound generating device provided by the embodiment of the utility model;

Figure 3 is a cross-sectional view in the direction of A-A in Figure 1;

4 is a schematic diagram of the three-dimensional structure of the assembled voice coil skeleton, voice coil, and basin frame provided by the embodiment of the utility model;

FIG. 5 is a schematic diagram of a three-dimensional structure of a voice coil bobbin provided by an embodiment of the present invention.

Embodiments of the present invention

The present utility model will be further explained below in conjunction with the drawings and embodiments.

Please refer to FIG. 1, an embodiment of the present invention shows a three-dimensional structure of a sounding device 100. As shown in FIG. 1, the sounding device 100 includes a basin frame 10, a magnetic circuit system 20 housed in the basin frame 10, and a magnetic circuit system 20 held in the basin frame 10 The vibration system 30.

Please refer to FIG. 2. The embodiment of the present invention shows a three-dimensional structure of the sound generating device 100 after decomposition. As shown in FIG. 2, the above-mentioned vibration system 30 includes a diaphragm 31 that is fixed at the periphery of the frame 10 and drives the diaphragm 31 to vibrate. The voice coil 32, wherein the diaphragm 31 includes an annular folded ring portion 311 and a dome 312; the above-mentioned magnetic circuit system 20 includes a magnetic gap 21, and the voice coil 32 is inserted in the magnetic gap 21. In specific applications, the magnetic circuit system 30 is used to provide a drive for the voice coil 32 to vibrate the voice coil 32, thereby driving the diaphragm 31 to vibrate to produce sound.

Wherein, the voice coil 32 is covered with a voice coil skeleton 33.

In the embodiment of the present invention, the positional relationship among the voice coil 32, the voice coil bobbin 33, and the basin frame 10, and the detailed structure of the voice coil bobbin 33 will be described with FIGS. 3 to 5.

Please refer to FIGS. 3 and 4. FIG. 3 is a cross-sectional view in the direction of AA in FIG. 1, and FIG. 4 omits the magnetic circuit system 20 and the diaphragm 31 in the vibration system 30, and only shows the assembled voice coil skeleton 33. The three-dimensional structure of the voice coil 32 and the basin frame 10 facilitates the description of the positional relationship between the voice coil 32, the voice coil frame 33 and the basin frame 10. As shown in FIGS. 3 and 4, the voice coil 32 covers the voice coil frame 33, and the voice coil frame 33 is placed between the voice coil 32 and the diaphragm 31, and the voice coil frame 33 is installed in the basin frame 10.

Please refer to FIG. 5. FIG. 5 also separately shows the three-dimensional structure of the voice coil bobbin 33 to facilitate the description of the detailed structure of the voice coil bobbin 33.

3 to 5, it can be seen that the voice coil skeleton 33 includes a voice coil skeleton main body 331 glued to the voice coil 32, two thermally conductive arms 332 extending outward from both ends of the voice coil main body 331, and a thermally conductive arm 332. The frame heat dissipation portion 333 connected to the frame heat dissipation portion 333 is embedded in the basin frame 10 and is at least partially exposed from the basin frame 10.

In a specific application, the voice coil skeleton body 331 is a rectangular frame structure with two relatively short sides and two relatively long axes, and the skeleton heat dissipation portion 333, the heat conduction arm 332, and the voice coil skeleton body 331 are an integrated structure. When the sound generating device 100 works and heat is generated in the voice coil 32, the voice coil skeleton main body 331 transfers the heat of the voice coil 32 to the heat conduction arm 332, and then transfers the heat conduction arm 332 to the outside through the skeleton heat sink 333.

Therefore, by providing the bobbin heat dissipation portion 333, the heat conduction arm 332, and the voice coil bobbin main body 331, the heat dissipation area of the voice coil bobbin 33 can be increased, and the heat dissipation performance of the voice coil bobbin 33 can be improved. After the voice coil skeleton body 331 transfers the heat of the voice coil 32 to the heat conduction arm 332, the heat conduction arm 332 and the skeleton heat dissipation portion 333 can radiate the heat in the voice coil 32 in time, thereby reducing the temperature of the voice coil 32 in time to achieve The purpose of effectively controlling the temperature of the voice coil 32 is to prevent the voice coil 32 from heating and causing the sound generating device 100 to malfunction.

In one embodiment, the heat conduction arm 332 is provided with a hollow pattern, thereby increasing the heat dissipation area of the heat conduction arm 332 while increasing the heat dissipation performance of the heat conduction arm 332.

In FIG. 5, the embodiment of the present invention only exemplarily shows a type of hollow pattern, which is used to represent the specific shape of the heat conduction arm, and is not a specific limitation on the hollow pattern. In the embodiment of the utility model, the hollow pattern includes a closed line segment with irregular edges and an arc line segment placed in the closed line segment. One end of the closed line segment is connected to the main body of the voice coil skeleton, and the other end of the closed line segment is connected to the following skeleton The heat sink is connected.

Please refer to FIGS. 3 to 5, the embodiment of the present invention provides a detailed description of the structural relationship between the heat conduction arm 332 and the frame heat dissipation portion 333. As shown in FIGS. 3 to 5, the frame heat dissipation portion 333 is turned over from the heat conduction arm 332 away from the voice coil frame main body 331 and is exposed on the side surface of the basin frame 10. Taking FIG. 4 as an example, the heat conduction arm 332 placed on the left side includes a direction away from the voice coil frame body 331, that is, the frame heat dissipation portion 333 extending to the left and folded; the heat conduction arm 332 placed on the right side includes a direction away from The direction of the main body 331 of the voice coil frame is the frame heat dissipation part 333 that extends to the right and is folded. The folded frame heat dissipation part 333 and the heat conduction arm 332 are perpendicular to each other, and the frame heat dissipation part 333 is injection molded into the basin frame 10. The frame heat dissipation portion 333 is exposed on the side of the frame 10. Therefore, the frame heat dissipation portion 333 can introduce heat into the frame 10 and increase the contact area between the heat conduction arm 332 and the outside, thereby improving the heat transfer effect of the voice coil 32.

Please refer to FIG. 5, the embodiment of the present invention also describes the detailed structure of the voice coil skeleton body 331. As shown in FIG. 5, the voice coil skeleton body 331 is a rectangular frame with two relatively short sides and two relatively long axes. The structure includes a glued portion 3311 for fixing the voice coil 32 and a support portion 3312 for supporting the diaphragm 31 and connected to the glued portion 3311. The glued portion 3311 is a ring structure and is arranged around the voice coil 32 so that the glued portion 3311 The shape matches the voice coil 32, and the voice coil 32 can be embedded in and glued to the glue part 3311.

In the embodiment of the present invention, the voice coil skeleton 33 is a thin metal sheet. It is conceivable that the voice coil skeleton main body 331, the heat conduction arm 332, and the skeleton heat dissipation portion 333 are also thin metal sheets of the same material.

In the embodiment of the present invention, the voice coil frame 33 is used to fix the voice coil 32 and control the temperature of the voice coil 32, the voice coil frame main body 331 is the contact part of the voice coil frame 33 and the voice coil 32, the heat conduction arm 332 and the frame The heat dissipation part 333 is the part of the voice coil skeleton 33 for dissipating the heat of the voice coil 32, and the glue part 3311 of the voice coil skeleton body 331 is in contact with the voice coil 32, the support part 3312 is in contact with the diaphragm 31, and the magnetic circuit system 30 drives the voice coil. At 32 o'clock, the voice coil 32 and the voice coil frame 33 vibrate, and the support portion 3312 drives the diaphragm 31 to vibrate to generate sound.

The voice coil skeleton provided by the embodiment of the utility model expands the structure of the voice coil skeleton. The provided voice coil skeleton includes a voice coil skeleton body, two heat conduction arms extending from the voice coil skeleton body, and a heat conduction force arm The frame heat dissipation part is connected, and the frame heat dissipation part is embedded in the basin frame and is at least partially exposed to the basin frame. The heat conduction arm and the heat dissipating part of the frame at both ends of the voice coil bobbin can transfer the heat generated by the voice coil to the outside of the voice coil when the generator is working, thereby effectively controlling the voice coil temperature.

The above are only the embodiments of the present utility model. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these all belong to The scope of protection of the utility model.

Claims

A voice coil skeleton, applied to a sounding device, the sounding device includes a basin frame, a magnetic circuit system contained in the basin frame, and a vibration system fixed on the basin frame, the vibration system including a diaphragm fixed on the periphery of the basin frame And a voice coil that drives the diaphragm to vibrate, characterized in that:

The voice coil skeleton covers the voice coil and connects the voice coil and the diaphragm;

The voice coil skeleton includes a voice coil skeleton main body glued to the voice coil, two heat conduction arms extending outward from both ends of the voice coil skeleton main body, and a skeleton heat sink connected to the heat conduction arms, The frame heat dissipation part is embedded in the basin frame and is at least partially exposed from the basin frame.
The voice coil skeleton according to claim 1, wherein the heat conduction arm is provided with a hollow pattern.
The voice coil skeleton according to claim 1, wherein the heat dissipating portion of the skeleton is folded from an end of the heat conduction arm away from the main body of the voice coil skeleton, and is exposed on the side surface of the basin frame.
4. The voice coil bobbin of claim 3, wherein the heat dissipation portion of the bobbin is perpendicular to the heat conduction arm.
3. The voice coil skeleton of claim 3, wherein the heat dissipation portion of the skeleton is injection molded into the basin frame.
5. The voice coil bobbin according to claim 1, wherein the main body of the voice coil bobbin comprises a glued part that fixes the voice coil and a support part that supports the diaphragm and is connected to the glued part.
7. The voice coil bobbin according to claim 6, wherein the glued part has a ring structure and is arranged around the voice coil.
The voice coil bobbin according to claim 1, wherein the voice coil bobbin is a thin metal sheet.