WO2021179665A1

WO2021179665A1 - Sound generation apparatus and electronic device

Info

Publication number: WO2021179665A1
Application number: PCT/CN2020/129587
Authority: WO
Inventors: 翟成祥; 郭翔
Original assignee: 歌尔股份有限公司
Priority date: 2020-03-13
Filing date: 2020-11-18
Publication date: 2021-09-16
Also published as: CN111294713A

Abstract

Disclosed are a sound generation apparatus and an electronic device. The sound generation apparatus comprises a magnetic circuit system and a vibration system, wherein the magnetic circuit system comprises a magnetic yoke, and a center magnetic circuit part and a side magnetic circuit part, which are arranged on the magnetic yoke, a magnetic gap being formed between the center magnetic circuit part and the side magnetic circuit part; and the vibration system comprises a voice coil, which is inserted in the magnetic gap. At least part of the surface of the magnetic circuit system is coated with a layer of thermal radiation material. One technical effect of the present invention lies in: good heat dissipation and cooling effects can be achieved on the sound generation apparatus during operation, so as to avoid the undesirable phenomenon of burning the voice coil.

Description

Sound generating device and electronic equipment

Technical field

The present invention relates to the technical field of acoustic devices, and more specifically, the present invention relates to a sound generating device and electronic equipment.

Background technique

In recent years, with the continuous improvement of people’s requirements for quality of life, high-quality music enjoyment has gradually become popular among the public, and sound generating devices used to play audio have been widely used in mobile phones, tablets, laptops, navigators, and smart wearable devices. In many different types of electronic products. The sounding device is a kind of transducer device that can convert an electric signal into an acoustic signal. The acoustic performance and reliability of the sounding device are very important and need to be paid attention to.

With the rapid development of smart phones, the applications of smart phones have become more and more extensive, and users have higher and higher requirements for all aspects of mobile phones. When using a smart phone, whether it is playing games, watching videos, or listening to music, usually high-quality sound effects are required, which puts higher requirements on the sound generating devices used in smart phones. Not only is the sounding device required to have the characteristics of large loudness, but also the sounding device is required to have both good sound quality effects. However, the high loudness of the sounding device is often accompanied by high power. As far as the existing sounding device is concerned, the current power has been increased to about 1W, but the sound efficiency of the sounding device itself is still relatively low, and most of the input power is converted For the heat. In fact, in the interior of the sound device, there are many parts that have poor temperature resistance, and the temperature that they can usually withstand is about 110°C. In order to prevent the components in the sounding device from being damaged or damaged due to high temperature, the temperature of the sounding device is usually limited and protected. However, the existing protection schemes usually bring about two serious drawbacks: one is that the acoustic performance of the sound device is limited, resulting in the failure of its maximum loudness. The second is that the protection effect is not ideal, and one of the heat sources-the voice coil is easily burned, which affects the service life of the sound generating device.

It can be seen that it is very necessary to study a new technology to solve the problems existing in the existing technology.

Summary of the invention

An object of the present invention is to provide a new technical solution for a sound generating device and electronic equipment.

According to the first aspect of the present invention, a sound generating device is provided, which includes a magnetic circuit system and a vibration system;

The magnetic circuit system includes a magnetic yoke, and a central magnetic circuit part and a side magnetic circuit part arranged on the magnetic yoke, and a magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part; the vibration The system includes a voice coil, and the voice coil is inserted in the magnetic gap;

Wherein, at least a partial surface of the magnetic circuit system is coated with a layer of heat radiation material.

Optionally, the heat radiation material layer is provided on at least one surface of the yoke.

Optionally, the heat radiation material layer is arranged on the surface of the magnetic gap.

Optionally, the central magnetic circuit part includes a central magnet and a first washer fixed on top of the central magnet, and the heat radiation material layer is provided on at least one of the central magnet and the first washer On the surface.

Optionally, the side magnetic circuit portion includes a side magnet and a second washer fixed on the top of the side magnet, and the heat radiation material layer is provided on at least one of the side magnet and the second washer On the surface.

Optionally, the material of the heat radiation material layer is a material with a heat radiation coefficient ≥ 0.7.

Optionally, the material of the heat radiation material layer is any one of carbon nano particles, graphene particles, carbon tubes, boron nitride particles, silicon carbide particles, and aluminum nitride particles.

Optionally, the thickness of the heat radiation material layer is 3 μm-20 μm.

Optionally, the thickness of the heat radiation material layer is 5 μm.

According to a second aspect of the present invention, an electronic device is provided. The electronic equipment includes the sound emitting device as described in any one of the above.

In the sound generating device provided by the embodiment of the present invention, the magnetic circuit system is improved. At least part of the surface of the magnetic circuit system is coated with a material with a higher thermal radiation coefficient, which can significantly improve the thermal radiation coefficient on the surface of the magnetic circuit system. , In order to achieve the purpose of accelerating heat dissipation. This design helps the sound device to have a good heat dissipation effect under long-term working conditions, and will not damage the internal parts-such as the voice coil, etc. due to excessive temperature, so as to extend the service life of the sound device. The technical task to be achieved or the technical problem to be solved by the present invention has never been thought of or anticipated by those skilled in the art, so the present invention is a new technical solution.

Through the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings, other features and advantages of the present invention will become clear.

Description of the drawings

The drawings incorporated in the specification and constituting a part of the specification illustrate the embodiments of the present invention, and together with the description are used to explain the principle of the present invention.

Fig. 1 is a schematic diagram of the structure of a conventional sound generating device.

Fig. 2 is a cross-sectional view of a sound generating device according to an embodiment of the present disclosure.

FIG. 3 is a schematic diagram of FIG. 2 from another perspective.

Fig. 4 is a top view of a sound emitting device according to another embodiment of the present disclosure.

Fig. 5 is a partial cross-sectional view of Fig. 4.

Fig. 6 is a cross-sectional view of a sound emitting device according to another embodiment of the present disclosure.

Fig. 7 is a temperature rise curve diagram of a conventional sound generating device and the sound generating device of the present disclosure.

Description of reference signs:

1-first washer, 2-second washer, 3-center magnet, 4-side magnet, 5-yoke, 6-magnetic gap, 7-voice coil, 8-heat radiation material layer.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.

The following description of at least one exemplary embodiment is actually only illustrative, and in no way serves as any limitation to the present invention and its application or use.

The technologies, methods, and equipment known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be regarded as part of the specification.

In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiment may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

According to an embodiment of the present invention, a sound generating device is provided. The sound generating device can be used in many different types of electronic products such as smart phones, notebook computers, tablet computers, navigators, smart watches, VR devices, AR devices, etc., and its applications are relatively wide.

The specific structure of the sound generating device provided by the embodiment of the present invention will be described in detail below.

The sound generating device provided by the embodiment of the present invention includes a device housing, and a containing cavity is formed inside the device housing; the sound generating device further includes a magnetic circuit system and a vibration system, and the magnetic circuit system and the vibration system are together It is contained in the containing cavity. As shown in FIG. 1, the magnetic circuit system includes a magnetic yoke 5, and a central magnetic circuit part and a side magnetic circuit part arranged on the magnetic yoke 5. A magnetic gap 6 is formed between the central magnetic circuit part and the side magnetic circuit part. The vibration system includes a voice coil 7 and a diaphragm, and the voice coil 7 is inserted in the magnetic gap 6, and the diaphragm is arranged on the voice coil 7. Wherein, at least a partial surface of the magnetic circuit system is coated with a layer of heat radiation material 8.

When the sound device is in working condition, the voice coil 7 in the vibration system will generate a lot of heat as a heat source. As shown in Figure 1, the unmarked arrow in Figure 1 indicates the heat dissipation direction of the voice coil 7, and the heat of the voice coil 7 After radiating to the inner surface of the magnetic circuit system, it will first be absorbed by the surface of the components in the magnetic circuit system, and then the heat is radiated into the air through the outer surface of the magnetic circuit system, so as to realize the heat dissipation and cooling of the entire sound generating device. However, in the existing sounding device, the magnetic circuit system itself has a poor heat dissipation effect due to factors such as materials, and cannot quickly and timely dissipate the heat generated in the sounding device into the air, which will cause the sounding device The temperature inside is too high, even burning the voice coil.

In view of the defects in the prior art, the sound generating device provided by the embodiment of the present invention appropriately improves the magnetic circuit system therein. Specifically, at least a partial surface of the magnetic circuit system is coated with a material with a higher thermal radiation coefficient, which helps to increase the thermal radiation coefficient on the surface of the magnetic circuit system, thereby achieving the purpose of accelerating heat dissipation. The design of the present invention helps the sound generating device to have a good heat dissipation effect under a long-term working state, and will not damage the internal parts-such as the voice coil 7 and the like, due to excessive temperature. Since the heat radiation material layer 8 is preformed on at least part of the surface of the magnetic circuit system, the magnetic circuit system has good heat conduction and heat dissipation capabilities, and can quickly and timely conduct the heat inside the sound generating device to the outside of the sound generating device. , And disperse into the air to achieve a good cooling effect on the sound device. It can avoid the phenomenon of voice coil burning.

The sound generating device provided by the embodiment of the present invention has a good heat dissipation effect, and will not cause the internal parts of the sound generating device to be burned due to excessively high internal temperature due to the long-term working state. In addition, the design of the present invention does not affect the acoustic performance of the sound generating device, so that the sound generating device has the characteristics of large loudness and good sound quality.

In the sound generating device provided by the embodiment of the present invention, the heat radiation material is attached to at least a part of the surface of the magnetic circuit system by coating to form the heat radiation material layer 8. Specifically: the material with relatively high thermal emissivity is made into nano-particles, and then mixed with the corresponding solvent (for example, using volatile materials) to form a mixture, and then the formed mixture is coated Cover it on the surface of the endothermic, and finally bake it to evaporate the solvent. The coating method adopted in the embodiment of the present invention is relatively simple, easy to operate, and will not cause difficulty in production, and can firmly combine the heat radiation material and the surface of the heat absorber to form an integral structure. Of course, in addition to the above-mentioned coating method, other combining methods well known to those skilled in the art can also be used, which is not limited by the present invention.

In the sound generating device provided by the embodiment of the present invention, at least a partial surface of the magnetic circuit system is coated with a layer of heat radiation material 8. That is to say, the heat radiation material layer 8 can be selectively coated on the appropriate part of the magnetic circuit system, of course, the heat radiation material layer 8 can also be coated on the surface of the entire magnetic circuit system to maximize the heat dissipation effect. . Those skilled in the art can flexibly choose the specific position for coating the heat radiation material 8 on the magnetic circuit system according to actual needs, and there is no limitation on this.

For example, the heat radiation material layer 8 is provided on at least one surface of the yoke 5. The yoke 5 carries the central magnetic circuit part and the side magnetic circuit part. It has a large surface area, which helps to coat the heat radiation material layer 8 on its surface in a large range. The heat generated by the voice coil 7 during operation can be transferred by the magnetic The heat radiation material layer 8 on the yoke 5 is quickly and timely dissipated to reduce the temperature of the voice coil 7, so as to avoid the bad phenomenon of voice coil burning.

In a specific embodiment of the present invention, as shown in FIG. 2, a heat radiation material layer 8 is coated on the side of the yoke 5 facing the central magnetic circuit portion. In another specific embodiment of the present invention, as shown in Fig. 3, a heat radiation material layer 8 is coated on the side of the yoke 5 facing away from the central magnetic circuit portion. Of course, in addition to the above-mentioned two methods, the heat radiation material layer 8 can also be coated on the side of the yoke 5 facing the central magnetic circuit part and the side facing away from the central magnetic circuit part, respectively. Good to improve heat dissipation performance. Those skilled in the art can make adjustments flexibly according to actual needs, and there is no limitation on this.

In addition, in order not to increase the size of the yoke 5 in the thickness direction, a method may also be adopted, that is, a recessed area is formed in advance on at least one surface of the yoke 5. At this time, the heat radiation material is embedded in the recessed area. This method of arranging the heat radiation material layer 8 does not occupy the space in the thickness direction of the yoke 5, and therefore does not increase the thickness of the yoke 5.

For another example, as shown in FIGS. 4 and 5, the heat radiation material layer 8 is disposed on the surface of the magnetic gap 6. The voice coil 7 in the vibration system is suspended in the magnetic gap 6 of the magnetic circuit system, and the heat radiation material layer 8 is coated on the surface of the magnetic gap 6 to quickly radiate the heat generated by the voice coil 7 to the outside. In this way, the voice coil 7 can also have a good cooling effect. In addition, it should be noted that, as shown in FIG. 4, when the heat radiation material layer 8 is coated on the surface of the magnetic gap 6, the trajectory of the heat radiation material layer 8 is preferably along the entire magnetic gap 6 to achieve uniformity, Quickly dissipate heat to avoid the situation that local temperature is not suitable for dissipating.

As shown in Figures 1 and 6, for another example, the central magnetic circuit part includes a central magnet 3 and a first washer 1 fixed on top of the central magnet 3, and the heat radiation material layer 8 is arranged on the At least one of the central magnet 3 and the first washer 1 is on the surface. That is to say, when coating the heat radiation material layer 8 on the central magnetic circuit part of the magnetic circuit system, you can choose to coat the heat radiation material layer 8 on the surface of the central magnet 3, or you can coat the heat radiation material layer 8 on the surface of the first washer 1. The surface of is coated with a heat radiation material layer 8, of course, a heat radiation material layer can also be coated on the surfaces of the central magnet 3 and the first washer 1 respectively. The heat generated during the operation of the voice coil 7 can be quickly dissipated to the outside through the central magnetic circuit part to achieve the purpose of cooling down.

For another example, in the sound generating device provided by the embodiment of the present invention, in addition to the central magnetic circuit part, the yoke 5 is also provided with side magnetic circuit parts around the central magnetic circuit part. As shown in Fig. 1, the side magnetic circuit part includes a side magnet 4 and a second washer 2 fixed on the top of the side magnet 4. The heat radiation material layer 8 is formed between the side magnet 4 and the side magnet 4 and the second washer 2 At least one of the second washers 2 is on the surface. That is to say, when coating the heat radiation material layer 8 on the side magnetic circuit part, you can choose to coat the heat radiation material layer 8 on the surface of the side magnet 4, or coat the surface of the second washer 2 The heat radiating material layer 8 can also be coated with a heat radiating material layer 8 on the surface of the side magnet 4 and the second washer 2 respectively. In this case, the heat produced by the voice coil 7 can be quickly dissipated to the outside through the side magnetic circuit part, so as to achieve the purpose of cooling down and avoiding coil burning.

It should be noted that when coating the radiation material layer 8 on the central magnetic circuit part and the side magnetic circuit parts, you can choose to coat only the central magnetic circuit part, or you can choose to coat only the side magnetic circuit part. Of course, you can also choose to coat the central magnetic circuit part and the side magnetic circuit part separately. Generally speaking, the larger the coated area, the better the heat dissipation effect. Those skilled in the art can flexibly adjust the coating position according to the specific situation, and there is no restriction on this.

In the embodiment of the present invention, the position where the heat radiation material layer 8 can be coated on the magnetic circuit system includes the magnetic gap 6, the central magnetic circuit part, the side magnetic circuit part and the yoke 5. One or more of them can be individually selected to be coated with the heat radiation material layer 8. Those skilled in the art can make adjustments flexibly according to needs, and there is no restriction on this.

In the sound emitting device provided by the embodiment of the present invention, the material used for the heat radiation material layer 8 is a material with a relatively high heat radiation coefficient. For example, a material with a thermal radiation coefficient ≥ 0.7 can be used.

Optionally, the material of the heat radiation material layer 8 is nano carbon particles. The reasons why nano-carbon can improve the heat radiation efficiency are: (1) The color of nano-carbon is black. Black is good for absorbing/emitting infrared light and heat radiation. The operating temperature of the sound device is about 100°C, which belongs to infrared light and heat. radiation. (2) The thermal radiation coefficient of nano-carbon itself is relatively high, for example, the thermal radiation coefficient can reach 0.98, while the thermal radiation coefficient of the electroplated nickel/zinc on the surface of the existing magnetic circuit system is only 0.05. (3) The particle size of the nano-carbon particles is relatively small, which helps to increase the heat dissipation surface area and finally achieve a good heat dissipation effect.

In addition, in the embodiment provided by the present invention, the heat radiation material layer 8 is not limited to the use of the aforementioned nano-carbon particles, and other materials with a relatively high heat radiation coefficient, for example, heat radiation coefficient ≥ 0.7 can also be used. Specifically, the material of the heat radiation material layer 8 may also be any one of graphene particles, carbon tubes, boron nitride particles, silicon carbide particles, and aluminum nitride particles, for example. Those skilled in the art can flexibly choose according to the heat dissipation requirements, and there is no restriction on this.

In the sound generating device provided by the embodiment of the present invention, by reasonably coating the thermal radiation material layer 8 on the magnetic circuit system, the heat dissipation efficiency and effect of the magnetic circuit system can be significantly improved, and the heat generated by the voice coil 7 can be dissipated in time. In turn, the temperature of the entire sounding device in the working state is reduced, and the temperature of the sounding device is prevented from being too high.

In the sound generating device provided by the embodiment of the present invention, the thickness of the heat radiation material layer 8 should be reasonably controlled to avoid the thickness of the heat radiation material layer 8 formed being too thick, which would cause the entire magnetic circuit system to be unfavorable for assembly.

Optionally, the thickness range of the heat radiation material layer 8 can be controlled to be 3 μm-20 μm. Those skilled in the art can determine the actual thickness of the heat radiation material layer 8 according to the sensitivity of different positions in the magnetic circuit system to the thickness. Taking the magnetic gap 6 as an example, generally speaking, the minimum dimension of the width of the magnetic gap 6 is about 0.4 mm, so the heat radiation material layer 8 basically does not affect the space. In addition, according to the experimental results, coating the heat radiation material layer 8 on at least part of the surface of the magnetic circuit system, for example, coating the surface of the first washer 1 with a layer of nano-carbon material with a thickness of 3 μm-20 μm. Reduce the temperature rise of the sound device by about 3°C.

More preferably, the thickness of the heat radiation material layer 8 is 5 μm.

It should be noted that, in specific applications, those skilled in the art can flexibly adjust the thickness of the heat radiation material layer 8 as required, and there is no limitation on this.

As shown in Figure 7, two sets of comparison curves are shown. Curve a is the temperature rise curve of the magnetic circuit system in the conventional sounding device. Curve b is the temperature rise curve of the magnetic circuit system in the sound generating device provided by the embodiment of the present invention. The comparison shows that curve b is significantly lower than curve a. In other words, the temperature of the magnetic circuit system provided with the heat radiation material layer 8 is relatively low, and it has a good heat dissipation effect.

In the sound generating device provided by the embodiment of the present invention, the voice coil is used as a heat source, and the heat generated by the voice coil can be quickly and timely discharged through the magnetic circuit system to avoid the phenomenon of the voice coil being overheated and burned, and the service life of the voice coil can be improved , Which in turn helps to increase the service life of the entire sounding device.

According to the second aspect of the present invention, an electronic device is also provided. The electronic equipment includes the sound emitting device as described in any one of the above.

The electronic device may be, for example, a mobile phone, a notebook computer, a tablet computer, a navigator, a VR device, an AR device, a smart watch, etc., which is not limited in the present invention.

Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims

A sounding device, which is characterized in that it comprises a magnetic circuit system and a vibration system;

The magnetic circuit system includes a magnetic yoke, and a central magnetic circuit part and a side magnetic circuit part arranged on the magnetic yoke, and a magnetic gap is formed between the central magnetic circuit part and the side magnetic circuit part; the vibration The system includes a voice coil, and the voice coil is inserted in the magnetic gap;

Wherein, at least a partial surface of the magnetic circuit system is coated with a layer of heat radiation material.
The sound emitting device according to claim 1, wherein the heat radiation material layer is provided on at least one surface of the yoke.
The sound emitting device according to claim 1, wherein the heat radiation material layer is provided on the surface of the magnetic gap.
The sounding device according to claim 1, wherein the central magnetic circuit part includes a central magnet and a first washer fixed on the top of the central magnet, and the heat radiation material layer is provided on the central magnet and At least one of the first washers is on the surface.
The sounding device according to claim 1, wherein the side magnetic circuit part includes a side magnet and a second washer fixed on the top of the side magnet, and the heat radiation material layer is provided on the side magnet and At least one of the second washer is on the surface.
The sound emitting device according to claim 1, wherein the material of the heat radiation material layer is a material with a heat radiation coefficient ≥ 0.7.
The sound emitting device according to claim 1, wherein the material of the heat radiation material layer is any of carbon nano particles, graphene particles, carbon tubes, boron nitride particles, silicon carbide particles, and aluminum nitride particles. A sort of.
The sound emitting device according to claim 1, wherein the thickness of the heat radiation material layer is 3 μm-20 μm.
The sound emitting device according to claim 1, wherein the thickness of the heat radiation material layer is 5 μm.
An electronic device, characterized in that it comprises the sound emitting device according to any one of claims 1-9.