WO2021120287A1

WO2021120287A1 - Sound production apparatus and electronic terminal

Info

Publication number: WO2021120287A1
Application number: PCT/CN2019/128999
Authority: WO
Inventors: 李承伟; 张庆一; 陈萌
Original assignee: 歌尔股份有限公司
Priority date: 2019-12-18
Filing date: 2019-12-27
Publication date: 2021-06-24
Also published as: CN111131971B; CN111131971A

Abstract

Disclosed is a sound production apparatus, comprising: a housing, in which a metal piece is embedded; a diaphragm and a voice coil. The housing is provided with an accommodating space, and the diaphragm and the voice coil are arranged within the accommodating space. A surface of the diaphragm is formed with a metal layer, and the metal layer is respectively connected to the voice coil and the metal piece. Heat produced by the voice coil and hot air around the voice coil can be conducted to the outside of the sound production apparatus via the metal layer and the steel piece, so that the temperature of the voice coil can be rapidly reduced.

Description

Sound generating device and electronic terminal

Technical field

The present invention relates to the technical field of electro-acoustic conversion, in particular to a sound generating device and an electronic terminal.

Background technique

The sounding device is the basic unit for realizing electro-acoustic conversion. The sounding device includes a shell, a vibration component and a magnetic circuit component. The vibration component includes a diaphragm and a voice coil connected to the diaphragm. The voice coil and the magnetic circuit component are both located in the rear acoustic cavity of the sound device. The voice coil is placed in the magnetic gap formed by the magnetic circuit component. In this way, the voice coil receives the communication In the case of electrical signals, it can drive the diaphragm to vibrate under the action of the magnetic field generated by the magnetic circuit component, thereby inspiring the surrounding air to produce sound.

Since the voice coil of the sound device is made of wire, the voice coil will generate heat when it receives an AC signal. The longer the working time, the more obvious the heat will be. If the voice coil cannot effectively dissipate heat for a long time, it will Affect the service life of the sound device and the maximum volume that can be provided.

In the prior art, both the voice coil and the magnetic circuit components are installed in the rear acoustic cavity of the sound generating device, and the rear acoustic cavity is a closed structure. This makes the heat dissipation of the voice coil a problem that the industry has always been difficult to solve. The integration of the electronic equipment of the device is getting higher and higher, and the size of the sounding device is getting smaller and smaller. The heating of the voice coil has a particularly prominent influence on the performance of the sounding device. Therefore, it is very necessary to provide a new sounding device structure to have Conducive to heat dissipation of the voice coil.

Summary of the invention

An object of the present invention is to provide a new technical solution for the sound generating device, so as to realize the heat dissipation of the voice coil without substantially affecting the original acoustic performance.

According to the first aspect of the present invention, a sound generating device is provided. The sound generating device includes:

A shell, the shell is embedded with a metal sheet;

A diaphragm and a voice coil; the housing has an accommodating space, and the diaphragm and the voice coil are arranged in the accommodating space;

A metal layer is provided on the surface of the diaphragm, and the metal layer is connected to the voice coil and the metal sheet respectively.

Optionally, the material of the metal layer includes any one of copper, zinc, chromium, and aluminum.

Optionally, the thickness of the metal layer ranges from 5 μm to 10 μm.

Optionally, the metal layer is disposed close to the surface of the diaphragm of the voice coil.

Optionally, the metal layer is configured to be deposited on the surface of the diaphragm by distillation or sputtering.

Optionally, the sound emitting device further includes a heat-conducting member, one end of the heat-conducting member is connected to the metal layer, and the other end is connected to the metal sheet.

Optionally, the diaphragm includes a central part located at a central position and a folding ring part located at an edge position;

The heat conducting member is connected with the edge position of the vibrating membrane.

Optionally, the heat conducting member is copper foil or graphite sheet.

Optionally, the two ends of the heat conducting member are respectively adhesively fixed to the metal layer and the metal sheet.

According to another aspect of the present invention, an electronic terminal is provided. The electronic terminal includes the above-mentioned sound emitting device.

Beneficial effects of the present invention: The present invention provides a sounding device. The diaphragm of the sounding device is provided with a metal layer, and the voice coil is connected to the steel sheet through the metal layer; the heat generated by the voice coil and the hot air located around the voice coil can be The metal layer and the steel sheet are conducted to the outside of the sound device, which can quickly reduce the temperature of the voice coil.

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 an exploded view of the structure of the sound generating device of the present invention.

Fig. 2 is a schematic diagram of the structure of the sound generating device of the present invention.

Fig. 3 is a cross-sectional view of A-A shown in Fig. 2 of the present invention.

Fig. 4 is a heat conduction diagram of the sound generating device of the present invention.

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. 1 to 3, the sound generating device includes:

The shell is embedded with a metal sheet. In this embodiment, the metal sheet is actually a steel sheet 105; for example, an opening is formed on the outer surface of the shell, and the steel sheet 105 is embedded in the Opening. Wherein, the position of the shell corresponding to the diaphragm 106 is provided with the steel sheet 105. The steel sheet 105 on the one hand ensures the rigidity of the shell and reduces the thickness of the shell; on the other hand, it can increase the internal cavity space of the shell and improve the sound device Acoustic performance; as shown in FIG. 3, in this example, a steel sheet 105 is provided at the position of the upper shell 101 corresponding to the diaphragm 106.

The diaphragm 106 and the voice coil 107; the housing has an accommodating space, and the diaphragm 106 and the voice coil 107 are arranged in the accommodating space;

The voice coil 107 includes a voice coil body and a skeleton, and the voice coil body is wound outside the skeleton; the voice coil 107 is used to pass electrical signals. The voice coil 107 is fixedly connected to the diaphragm 106 to drive the diaphragm 106 to vibrate through the voice coil 107, thereby inspiring the surrounding air to produce sound.

The edge position of the diaphragm 106 is fixed in the sound emitting device. For example, the edge position of the diaphragm 106 is fixed in the housing of the sound emitting device. In this example, the surface of the diaphragm 106 is provided with a metal layer 1061,

The metal layer 1061 is connected to the voice coil 107 and the steel sheet 105 respectively. For example, the metal layer 1061 can extend beyond the edge of the diaphragm, and the metal layer 1061 is directly or indirectly connected to the steel sheet 105; or the end of the steel sheet 105 close to the diaphragm can extend upward to connect with the metal layer provided on the diaphragm, etc. .

In this example, a metal layer 1061 is provided on the surface of the diaphragm 106, wherein the metal layer 1061 has thermal conductivity; therefore, the voice coil 107 is connected to the steel sheet through the metal layer. When the voice coil 107 receives an electrical signal, the voice coil 107 will generate heat. The metal layer and the steel sheet will conduct the generated heat to the outside of the sound generating device to avoid heat accumulation in the sound generating device and affect the heat dissipation efficiency. The invention can improve the heat dissipation efficiency of the sound generating device, solves the problems of the vibration of the diaphragm that the vibration of the diaphragm is easily shifted and the diaphragm folds caused by the unbalanced air pressure of the front and rear sound chambers in the prior art, optimizes the parameter performance of the sound device and improves the sound generation The acoustic performance of the device.

In an optional embodiment, under vacuum conditions, the metal layer 1061 is deposited on the surface of the diaphragm by distillation or sputtering. This example uses vacuum coating to deposit the metal layer on the surface of the diaphragm. The thickness of the metal layer obtained by this method ranges from 5 μm to 10 μm. The inventor found that the thickness of the metal layer is within this range. When the heat of the sound generating device is conducted to the diaphragm, because the metal layer is deposited on the surface of the diaphragm (the metal layer has a heat insulation effect), the diaphragm will not be damaged due to heat conduction. On the other hand, the diaphragm will not affect the vibration performance of the diaphragm due to the metal layer deposited on its surface (such as the vibration frequency and vibration amplitude of the diaphragm, etc.), so the metal layer will not be deposited on the surface of the diaphragm. Will affect the acoustic performance of the sound device.

Therefore, the metal layer in this example can conduct the heat generated by the voice coil and its surroundings to the steel sheet 105; at the same time, when the metal layer is deposited on the surface of the diaphragm by this method, the metal layer is formed quickly and the adhesion of the metal layer is strong, which is not easy It falls off from the surface of the diaphragm, prolonging the service life of the sound device.

For example, the material of the diaphragm includes silica gel, and the material of the metal layer includes gold, silver, copper, zinc, chromium, aluminum, and so on.

In an optional embodiment, a metal layer is provided on the surface of the diaphragm close to the voice coil; the inventor found that when the metal layer 1061 is provided on the surface of the diaphragm close to the voice coil 107, on the one hand, the metal layer 1061 and the steel sheet Connection, can conduct the heat generated by the voice coil to the outside of the sound generating device; on the other hand, the metal layer has a heat insulation effect, and the metal layer can protect the diaphragm and prevent damage to the structure of the diaphragm caused by excessive temperature Wait.

In this example, without affecting the internal structure of the sounding device and the acoustic performance of the sounding device, the heat generated inside the sounding device can be quickly discharged in time, and the service life of the sounding device is prolonged.

In an optional embodiment, the sound generating device further includes a heat-conducting member 104, one end of the heat-conducting member 104 is connected to the metal layer 1061, and the other end is connected to the steel sheet 105.

In this example, a metal layer 1061 is provided on the surface of the diaphragm 106, wherein the metal layer 1061 has thermal conductivity; therefore, the voice coil 107 is connected to the steel sheet through the metal layer and the thermally conductive member. When the voice coil 107 receives an electrical signal, the voice coil 107 will generate heat. The metal layer, the heat-conducting member and the steel sheet will conduct the generated heat to the outside of the sound generating device to avoid heat accumulation in the sound generating device and affect the heat dissipation efficiency. The invention can improve the heat dissipation efficiency of the sound generating device, solves the problems of the vibration of the diaphragm that the vibration of the diaphragm is easily shifted and the diaphragm folds caused by the unbalanced air pressure of the front and rear sound chambers in the prior art, optimizes the parameter performance of the sound device and improves the sound generation The acoustic performance of the device.

On the other hand, in this example, the connection between the metal layer 1061 and the steel sheet 105 is realized through the heat conducting member 104, which facilitates the fixation between the metal layer 1061 and the steel sheet 105.

For example, the heat-conducting element 104 has an I-shaped structure, one end of the heat-conducting element is bonded and fixed with the metal layer, and the other end of the heat-conducting element is bonded and fixed with the steel sheet. This example improves the firmness and reliability of the connection between the metal layer, the heat-conducting element, and the steel sheet.

For example, the diaphragm 106 includes a central portion at the center and a folding ring portion at the edge; the heat conducting member 104 is connected to the edge of the diaphragm. For example, the metal layer 1061 is provided on the folding ring portion located at the edge, and the heat-conducting member 104 is fixedly connected to the metal layer located at the edge of the diaphragm. The inventor found that when the thermal conductive member 104 is connected to the edge of the diaphragm, it does not affect the vibration frequency, vibration amplitude, etc. of the diaphragm. Therefore, the installation of the thermal conductive member does not affect the acoustic performance of the sound device.

In an optional embodiment, the heat conducting member 104 includes copper foil or graphite sheet. For example, when a graphite sheet is used as the heat-conducting member, the graphite sheet has a unique crystal grain orientation, so that the graphite sheet can conduct heat uniformly, and the graphite sheet has a layered structure, so that it can be adapted to any surface. For example, when copper foil is used for the heat-conducting element, the copper foil can quickly convert a point heat source into a surface heat source. For example, the heat generated by the copper foil can be dispersed and conducted to the steel sheet to improve the heat dissipation efficiency.

In an optional embodiment, the shell includes an upper shell 101 and a lower shell 103, and the upper shell and the lower shell enclose the accommodating space; the upper shell 101 is embedded with the steel sheet 105.

Specifically, the space enclosed by the upper shell 101 and the diaphragm 106 is a front acoustic cavity; the space enclosed by the lower shell 103 and the diaphragm 106 is a rear acoustic cavity; wherein the voice coil 107 is located in the rear acoustic cavity. Since the rear acoustic cavity formed by the enclosure of the lower shell 103 and the diaphragm 106 is a closed cavity, the heat generated by the voice coil cannot be discharged in time, which affects the acoustic performance of the sound generating device.

This example improves the structure of the front acoustic cavity of the sounding device. For example, the diaphragm, the heat-conducting member and the steel sheet constitute the front sound cavity of the sounding device; the voice coil and the steel sheet constituting the front sound cavity are connected by a metal layer and the heat-conducting member to make the rear sound cavity The heat is discharged in time through the metal layer, heat-conducting member and steel sheet to reduce the heat around the voice coil and the voice coil and increase the service life of the sound generating device.

In an optional embodiment, the casing further includes a middle casing 102, the middle casing 102 is opened at both ends along the vibration direction of the diaphragm, and the upper casing 101 and the lower casing 103 can cover the On the shell 102. The middle shell 102 is provided with a pressure relief hole; on the one hand, the pressure relief hole is configured to balance the air pressure of the front acoustic cavity and the rear acoustic cavity; on the other hand, the middle shell is located in the rear acoustic cavity of the sound device, and the pressure is generated in the rear acoustic cavity. The heat is conducted to the steel sheet through the pressure relief hole.

Optionally, the heat-conducting element is respectively welded and fixed with the metal layer and the steel sheet; this example improves the firmness of the heat-conducting element.

Referring to Fig. 4, the direction of the arrow shown therein is the direction of heat conduction inside the sound emitting device. For example, the voice coil 107 is connected to an electrical signal to generate heat, and its heat is conducted down to the metal layer 1061 along the axial direction of the voice coil; wherein the metal layer 1061 is deposited on the first surface of the diaphragm close to the voice coil 107, because the metal layer 1061 has A certain degree of ductility and thermal conductivity, so the heat conducted to the metal layer 1061 is conducted from the center of the diaphragm to the folded ring portion of the diaphragm; wherein the folded ring portion of the diaphragm is connected to the steel sheet 104 through the heat conducting member 104; therefore, conduction The heat to the fold ring of the diaphragm is conducted to the steel sheet 105 through the heat conducting member 104; the steel sheet is embedded in the housing of the sounding device, so this example can conduct the heat generated inside the sounding device to the outside of the sounding device, improving The heat dissipation efficiency of the sound device.

In an optional embodiment, the sound emitting device further includes a magnetic circuit system; the magnetic circuit system includes a magnetic yoke 109 and a magnetic circuit assembly 108 arranged on the magnetic yoke 109; the voice coil 107 is placed In the magnetic gap formed by the magnetic circuit assembly 108; the magnetic conductive yoke 109 has a through hole, and the through hole 109 communicates with the magnetic gap;

The magnetic circuit assembly includes side magnets 1082 and center magnets 1081. The center magnet 1081 and the side magnet 1082 are both arranged on the magnetic yoke 109, the side magnet 1081 surrounds the center magnet 1081, and the side magnet 1082 and the center magnet 1081 are located on the same plane. The magnetic gap is formed between the center magnet 1081 and the side magnets 1082.

The through hole A is configured to be able to discharge the heat generated in the sound emitting device to the outside of the sound emitting device. The magnetic circuit system of this example is set in the rear acoustic cavity of the sounding device. The magnetic yoke 109 is partially provided with a through hole A, and at the same time the through hole A communicates with the magnetic gap formed by the magnetic circuit assembly 108; The through hole A is opened to make the rear acoustic cavity of the sounding device communicate with the outside of the sounding device. Therefore, the heat generated by the electric signal of the voice coil 107 located in the magnetic gap can be conducted to the outside of the sounding device through the magnetic gap and through holes, which improves The heat dissipation efficiency of the sound device.

Referring to Figure 3, the magnetic circuit system of this example includes two magnetically conductive yokes, and a waterproof and breathable membrane is arranged between the two magnetically conductive yokes;

Two of the magnetically conductive yokes respectively include a magnetically conductive yoke 1091 and a magnetically conductive yoke 1092; wherein the two magnetically conductive yokes are arranged in parallel along the vibration direction of the sound device, and both magnetically conductive yokes are provided with the through holes; for example, the magnetically conductive yoke is During the fixed installation process, the through holes of the two magnetic yokes are connected to each other, so as to improve the heat dissipation efficiency of the sound generating device.

The waterproof and breathable membrane 110 prevents impurities and humid air in the external environment of the sound generating device from entering the inside of the sound generating device to affect its acoustic performance.

Optionally, the area of the through hole formed by one magnetic yoke 1091 far from the magnetic circuit assembly is larger than the area of the through hole formed by the other magnetic yoke 1092. For example, in the installation process of the sound device, first install the magnetic yoke 1092 close to the magnetic circuit assembly; after installing and fixing the magnetic yoke 1092 close to the magnetic circuit assembly, install the magnetic yoke 1091 away from the magnetic circuit assembly; To overcome the structural failure of the two through holes opened due to installation errors to communicate with each other, in this example, the area of one magnetic yoke 1091 that is far away from the magnetic circuit assembly is larger than that of the other magnetic yoke 1092. In order to avoid this structural error, the heat generated inside the sound device is discharged in time through the magnetic gap and the through hole.

According to another aspect of the present invention, an electronic terminal is provided. The electronic terminal includes the above-mentioned sound emitting device. When the sound emitting device is applied to an electronic terminal, the heat dissipation efficiency of the electronic terminal can be improved, and the electronic terminal can be prevented from easily generating heat when the electronic terminal is used for a long time, which affects its service life.

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, characterized in that the sounding device comprises:

A shell, the shell is embedded with a metal sheet;

A diaphragm and a voice coil; the housing has an accommodating space, and the diaphragm and the voice coil are arranged in the accommodating space;

A metal layer is formed on the surface of the diaphragm, and the metal layer is connected to the voice coil and the metal sheet respectively.
The sounding device according to claim 1, wherein the material of the metal layer includes any one of copper, zinc, chromium, and aluminum.
The sound emitting device according to claim 1, wherein the thickness of the metal layer ranges from 5 μm to 10 μm.
The sound emitting device according to claim 1, wherein the metal layer is provided close to the surface of the diaphragm of the voice coil.
The sound generating device according to claim 1, wherein the metal layer is configured to be deposited on the surface of the diaphragm by distillation or sputtering.
The sound emitting device according to claim 1, wherein the sound emitting device further comprises a heat conducting member, one end of the heat conducting member is connected to the metal layer, and the other end is connected to the metal sheet.
The sounding device according to claim 6, wherein the diaphragm includes a central part located at a central position and a folding ring part located at an edge position;

The heat conducting member is connected with the edge position of the vibrating membrane.
The sound generating device according to claim 6, wherein the heat conducting member is copper foil or graphite sheet.
7. The sound emitting device according to claim 6, wherein the two ends of the heat conducting member are respectively adhesively fixed to the metal layer and the metal sheet.
An electronic terminal, characterized in that the electronic terminal comprises the sound emitting device according to any one of claims 1-9.