WO2020181893A1

WO2020181893A1 - Sound generation device and electronic product

Info

Publication number: WO2020181893A1
Application number: PCT/CN2019/129737
Authority: WO
Inventors: 王兴龙; 马学敏; 葛连山
Original assignee: 歌尔股份有限公司
Priority date: 2019-03-14
Filing date: 2019-12-30
Publication date: 2020-09-17
Also published as: CN111698621A; CN111698621B

Abstract

The present invention discloses a sound generation device and an electronic product. The sound generation device comprising: a housing, and, disposed on the housing: a first vibration system, the first vibration system comprising a first diaphragm and, disposed at intervals on the first diaphragm, at least two first voice coils; a second vibration system, the second vibration system comprising a second diaphragm and, disposed on the second diaphragm, at least two second voice coils, the second diaphragm being disposed relative to the first diaphragm; a magnetic circuit system, the magnetic circuit system comprising a center magnet and a support member, the support member being disposed between the first vibration system and the second vibration system. A technical effect of the present invention is that the sound generation device is louder and has better acoustic performance.

Description

Sound devices and electronic products

Technical field

The present invention relates to the field of electroacoustic technology, and more specifically, to a sound generating device and an electronic product.

Background technique

The sound generating device is an important acoustic component in portable electronic equipment. It is a device used to realize the conversion of electrical signals and acoustic signals. It is often used in electronic equipment such as mobile phones and computers. With the rapid development of related technologies of electronic products, in order to achieve better performance, those skilled in the art have improved the structure and other characteristics of the sound generating device.

Inside the electronic product, due to the limited space for installing the sound device, the existing sound device installed on the electronic product usually adopts a structure where a single diaphragm produces sound on the front side. In order to further improve the acoustic performance of the sound-generating device, it is necessary to increase the vibration area and working amplitude of the sound-generating device to improve the performance. However, the increase in the vibration area will increase the size of the sound-generating device, which makes it difficult to assemble into electronic products with limited space. At the same time, the increase of the vibrating area will cause the working amplitude of the sound device to increase, which is likely to have an adverse effect on the acoustic performance of the sound device.

Therefore, it is necessary to propose a new type of sounding device to overcome the above-mentioned drawbacks.

Summary of the invention

An object of the present invention is to provide a new technical solution for a double-sided sound emitting device.

According to a first aspect of the present invention, there is provided a sound emitting device, which includes a housing and:

A first vibration system, the first vibration system comprising a first diaphragm and at least two first voice coils spaced apart on the first diaphragm;

A second vibration system, the second vibration system includes a second diaphragm and at least one second voice coil arranged on the second diaphragm, the second diaphragm being arranged opposite to the first diaphragm;

A magnetic circuit system, the magnetic circuit system includes a central magnet and a support, and the support is located between the first vibration system and the second vibration system.

Optionally, the magnetic circuit system further includes: a side magnet part, and the first voice coil and the second voice coil are suspended in a magnetic gap formed by the side magnet part and the center magnet.

Optionally, the central magnet includes: two first magnets;

The two first voice coils have the same size and are arranged side by side in the magnetic gap formed by the first magnet and the side magnet part.

Optionally, the support includes a frame portion adjacent to the first diaphragm and having a hollow, and a central portion adjacent to the second diaphragm; the central portion is relatively located in the central area of the frame portion and supported by the connecting portion On the frame portion, a gap is formed between the center portion and the frame portion;

The central magnet and the first washer are sequentially arranged on the surface of the central part facing the first diaphragm.

Optionally, the edge magnet part includes edge magnets and edge washers which are sequentially arranged on the surface of the frame body part facing the second diaphragm; the first voice coil is suspended by the center magnet and the second diaphragm. The second voice coil is suspended in the magnetic gap surrounded by the center magnet, the center part and the side magnets, and the side washer.

Optionally, the side magnet part includes a side magnet and a side washer; the housing includes a first housing and a second housing, the support member is injection molded on the first housing, and the side China The second shell is injection molded on the second shell.

Optionally, the magnetic circuit system further comprises: a second magnet, and the second voice coil is suspended in a magnetic gap formed by the second magnet and the side magnet part.

Optionally, the number and arrangement of the second voice coil and the first voice coil are the same.

Optionally, the support member has a flat plate structure, and the second magnet and the second washer are sequentially arranged on the surface of the support member.

Optionally, it further includes: two sets of centering support pieces, the two sets of centering support pieces are respectively arranged between the first vibration system and the second vibration system, and the centering support pieces are provided with welding Disk, the two sets of the centering support pieces are conducted through metal inserts to access external electrical signals.

According to a second aspect of the present invention, there is provided an electronic product, which is characterized by comprising:

The above-mentioned sound generating device;

The main body of an electronic product, wherein the sound generating device is arranged in the main body of the electronic product, and the main body of the electronic product has a sound outlet through which the sound generated by the sound generating device is transmitted.

The sound device provided by the present invention has two sets of vibration systems arranged in the shell, and at least one of the vibration systems is provided with multiple voice coils, and the two sets of vibration systems share the magnetic circuit system between the two diaphragms, which greatly saves The height space of the sounding device is reduced, and the size of the sounding device housing is reduced. The sounding device can be made lighter and thinner; at the same time, the two vibration systems do not interfere with each other, which makes the amplitude of the two vibration systems effective , The loudness of the sound device is greater and the acoustic performance is better.

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 thereof are used to explain the principle of the present invention.

FIG. 1 is a schematic structural diagram of a sound generating device provided by a specific embodiment of the present invention;

Figure 2 is a schematic cross-sectional view of Figure 1 along the A-A section;

Figure 3 is a schematic cross-sectional view taken along the B-B section of Figure 1;

4 is a schematic diagram of the structure of the supporting member in the sound generating device according to the specific embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of another sound emitting device according to a specific embodiment of the present invention;

6 is a schematic cross-sectional view of another sound emitting device provided by the specific embodiment of the present invention

Fig. 7 is an exploded view of a sound generating device provided by a specific embodiment of the present invention.

detailed description

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, numerical expressions and numerical values of the components and steps 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 the examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as limiting. 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, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

FIG. 1 is a schematic structural diagram of a sound generating device provided by a specific embodiment of the present invention, FIG. 2 is a schematic cross-sectional view along the AA section of FIG. 1, FIG. 3 is a schematic cross-sectional view along the BB section of FIG. 1, and FIG. 4 is a specific embodiment of the present invention Figure 5 is a schematic cross-sectional view of another sound generating device provided in the specific embodiment of the present invention. Figure 6 is a schematic cross-sectional view of another sound generating device provided in the specific embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An exploded view of the sound generating device provided. Now, taking FIGS. 1 to 7 as an example, the structure and principle of the sound generating device of the present invention will be described in detail.

The present invention provides a sound generating device, which includes a housing, a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system and the second vibration system are respectively located above and below the magnetic circuit system. The two vibration systems share a magnetic circuit system to produce sound. The whole sounding device can be, but is not limited to, a rectangular structure, a racetrack-shaped structure or a circular structure. The rectangular structure is taken as an example for description.

As shown in Figures 1 and 2, a cavity is formed inside the housing. The first vibration system and the second vibration system are respectively suspended on the upper and lower ends of the magnetic circuit system.

The first vibration system includes a first diaphragm 11 and at least two first voice coils 12 arranged on the first diaphragm 11 at intervals, and a plurality of the first voice coils 12 are arranged in the housing and located One side of the magnetic circuit system along the vibration direction. The vibration direction in this embodiment refers to the vibration direction of the first vibration system and the second vibration system. For example, when the number of first voice coils is two, the two first voice coils may be arranged side by side on the first diaphragm; or, the two first voice coils are one large voice coil and one small voice coil , The small voice coil and the large voice coil are sheathed together on the first diaphragm. Or, three identical first voice coils are arranged side by side on the first diaphragm, and this embodiment does not specifically limit the number and location of the first voice coils.

Similarly, the second vibration system includes a second diaphragm 21 and at least one second voice coil 22 arranged on the second diaphragm, and the second diaphragm 21 is opposite to the first diaphragm 11. Set, located on the other side of the magnetic circuit system along the vibration direction. The number of the second voice coil 22 can be one, two or more. Those skilled in the art can arrange at least one second voice coil 22 on the second diaphragm 21 according to requirements, so that the first The vibration system and the second vibration system simultaneously vibrate and sound in the same or opposite directions.

In particular, the magnetic circuit system includes a central magnet and a support 32, and the support 32 is located between the first vibration system and the second vibration system. The supporting member 32 can be arranged in different shapes as required, so that the first vibration system and the second vibration system share the magnetic circuit system. Those skilled in the art can understand that the first voice coil 12 and the second voice coil 22 are respectively suspended in the magnetic gap of the magnetic circuit system to drive the first diaphragm 11 and the second diaphragm 21 Vibration sounds. Wherein, the magnetic circuit system may be a single magnetic circuit system, a three magnetic circuit system, a five magnetic circuit system or a ring magnetic circuit system, which is not limited in this embodiment.

The sound device provided by the present invention has two sets of vibration systems arranged in the shell, and at least one of the vibration systems is provided with multiple voice coils, and the two sets of vibration systems share the magnetic circuit system between the two diaphragms, which greatly saves The height space of the sounding device is reduced, and the size of the sounding device housing is reduced. The sounding device can be made lighter and thinner; at the same time, the two vibration systems do not interfere with each other, which makes the amplitude of the two vibration systems effective , The loudness of the sound device is greater.

Optionally, the magnetic circuit system further includes: side magnetic parts, the number and form of the side magnetic parts are not limited by the shape of the housing of the sounding device. For example, the edge magnet part may be composed of a ring magnet and a ring washer, or may be composed of a bar magnet and a washer. The first voice coil 12 and the second voice coil 22 are suspended in a magnetic gap formed by the side magnet part and the center magnet. In the embodiment shown in FIG. 3, the first voice coil 12 and the second voice coil 22 are respectively inserted into the magnetic gap formed by the center magnet and the side magnet part from the upper side and the lower side of the magnetic circuit system. in.

Specifically, the central magnet includes: two first magnets 311. When the number of the first voice coils 12 is two, the two first voice coils 12 have the same size and are arranged side by side in the magnetic gap formed by the first magnet 311 and the side magnet part. In this way, the two energized first voice coils 12 vibrate in a magnetic field, and the two vibrating first voice coils 12 jointly drive the first diaphragm 11 to produce sound, which converts mechanical energy into sound energy. Since the two first voice coils 12 are of the same size and arranged side by side, the structure is more compact, the magnetic gap between the two first voice coils 12 is smaller, and higher magnetic performance can be obtained, which helps to improve the acoustic performance of the sound generating device.

In a possible implementation, the support 32 includes a frame portion 321 adjacent to the first diaphragm 11 and having a hollow, and a central portion 322 adjacent to the second diaphragm 21. As shown in Fig. 4, the hollow area is located in the central area of the frame body 321. The shape and size of the frame body 321 can be adapted according to the size of the sound generating device. The shape and size of the hollow area and the central part 322 can be adapted according to the magnetic circuit system. Make a selection. In this embodiment, the shapes of the frame body portion 321, the hollow area and the central portion 322 are all rectangular. The central portion 322 is arranged relative to the central area of the frame portion 321. For example, the central portion 322 is located above or below the frame portion 321, and the central portion 322 is supported on the frame portion 321 through the connecting portion 323. The connecting portion 323 may It has a sheet-like or strip-like structure, and the connecting portion 323 is connected to the frame portion 321 so that a gap is formed between the central portion 322 and the frame portion 321.

As shown in FIGS. 2 and 3, the support 32 is located in the magnetic circuit system, and the central portion 322 is provided with the first magnet 311 and the first washer 34 on the surface facing the first diaphragm 11 in sequence. . The height difference between the central portion 322 and the frame portion 321 can just accommodate the first magnet 311 and the first washer 34. At the same time, the second voice coil 22 is inserted into the gap between the central portion 322 and the frame portion 321 to share a magnetic circuit system with the first voice coil 12. In this way, the first voice coil and the second voice coil located in the magnetic gap obtain higher magnetic performance, and the acoustic performance of the sound device is better.

Specifically, the side magnet part includes a side magnet 331 and a side washer 332 which are sequentially arranged on the surface of the frame body part facing the second diaphragm 21. As shown in FIG. 3, the first voice coil 12 is suspended in the magnetic gap formed by the first magnet 311, the first washer 34, the side magnet 331 and the frame portion 321, and the support 32 is on the long axis. The frame portion 321 of the direction is at the same height as the first washer 34 located in the middle of the magnetic circuit system. The first magnet 311 is located on the side of the first washer 34 away from the first diaphragm 11. The first magnet 311 and the side The magnets 331 are arranged opposite to the two sides of the first voice coil 12. It can be understood that the gap reserved for the first voice coil 12 between the frame portion 321 of the support 32 and the first washer 34 is small, which further modifies the magnetic field lines and enhances the magnetic efficiency. The second voice coil 22 is suspended in a magnetic gap surrounded by the first magnet 311, the central part 322, the side magnets 331 and the side washers 332. The frame body part and the center part of the support member cooperate with the first washer and the side washer in the first vibration system and the second vibration system respectively to correct the magnetic field lines.

As shown in FIG. 3, the central part 322 of the support 32 stably arranges the first magnet 311 and the first washer 34 in the magnetic circuit system and is shared by the upper and lower first vibration system and the second vibration system. In the first vibration system, the multiple voice coil drive mode helps to reduce the aspect ratio of the side magnets, center magnets, etc. in the magnetic circuit system. It saves materials and reduces costs, while also helping to reduce process difficulty and improve Yield.

In another possible implementation manner, the side magnet part includes a side magnet 331 and a side washer 332. The housing includes a first housing 41 and a second housing 42, and the first housing 41 and the second housing 42 are used to support and fix the components in the sound generating device. As shown in FIG. 3, the support 32 is injection molded on the first housing 41, and the frame portion 321 of the support 32 can be used as a side washer, which saves materials. In the second vibration system, the edge washer 332 is injection molded into the second housing 42. Compared with the traditional bonding process, the support member and the edge washer fixed by the injection molding process are used for the sound device. The structural strength and stability have been improved.

In this embodiment, the magnetic circuit system further includes: a second magnet 35, and the second voice coil 22 is suspended in a magnetic gap formed by the second magnet 35 and the side magnet portion. In this embodiment, the second magnet 35 and the two side-by-side first magnets 311 are arranged directly opposite to each other. When the two vibration systems work at the same time, they have better effects of resisting swing and polarization. At the same time, the two first voice coils 12 in the first vibration system cooperate with the first diaphragm 11 to reduce the amplitude of vibration and increase the loudness of the sound generating device.

In the embodiment shown in FIG. 5, the side magnets 331 in the first vibration system and the second vibration system are arranged on both sides of the support 32 in the vibration direction, and the side magnets 331 in the two vibration systems have the same size. , It is convenient for large-scale production and reduces the difficulty of assembly.

Further, the number and arrangement of the second voice coil 22 and the first voice coil 12 are the same. That is, the number and orientation of the first voice coil, the second voice coil, the first diaphragm, and the second diaphragm in the first vibration system and the second vibration system are the same.

For example, as shown in FIG. 6, in this embodiment, two first voice coils 12 and two second voice coils 22 are provided in the first vibration system and the second vibration system, respectively, and there are two vibrations with the voice coil. Matching multiple magnets and washers, etc. In this sounding device, the two vibration systems are arranged in the same manner, and the vibration balance of the vibration system is better. When the vibration systems on both sides of the support vibrate in the opposite direction, the overall vibration problem of the sounding device can be significantly offset.

On the one hand, this kind of sounding device produces sound on both sides, and the first voice coil and the second voice coil can be connected in parallel or in series to jointly drive the vibration system to work. On the other hand, the first voice coil and the second voice coil in the two vibration systems can be independently connected to electrical signals and controlled separately. By adjusting the electrical signal, the purpose of suppressing the polarization of the sound device and improving the vibration can be achieved.

In this embodiment, the support plate has a flat structure. As shown in FIGS. 5 and 6, the support separates the first vibration system and the second vibration system, and the second magnet and the second washer are sequentially arranged on the surface of the support.

Optionally, the sound emitting device further includes: two sets of centering support pieces. As shown in Figure 7, two sets of centering support pieces 50 are respectively arranged between the first vibration system and the second vibration system, and pads are also provided on the centering support pieces 50, and the first A voice coil 12 and the second voice coil 22 are respectively connected to the pads on the centering support piece 50, and the two sets of centering support pieces are connected through the metal insert to access external electrical signals. In this way, the first vibration system and the second vibration system can respectively access external signals and work independently. For example, you can choose to let only one of the vibration systems work to realize the single-sided sound of the sounding device; or, choose the vibration system on one side to vibrate in the opposite direction to compensate the acoustic performance of the vibration system on the other side.

In another aspect of the present invention, an electronic product is also provided. The electronic product includes the above-mentioned sound emitting device and an electronic product main body, the sound emitting device is arranged in the electronic product main body, the electronic product main body has a sound outlet, and the sound outlet is used for transmitting the sound generated by the sound emitting device. Out.

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 sound generating device is characterized by comprising: a housing and: arranged on the housing:

A first vibration system, the first vibration system comprising a first diaphragm and at least two first voice coils spaced apart on the first diaphragm;

A second vibration system, the second vibration system includes a second diaphragm and at least one second voice coil arranged on the second diaphragm, the second diaphragm being arranged opposite to the first diaphragm;

A magnetic circuit system, the magnetic circuit system includes a central magnet and a support, and the support is located between the first vibration system and the second vibration system.
The sounding device according to claim 1, wherein the magnetic circuit system further comprises: a side magnet part, and the first voice coil and the second voice coil are suspended on the side magnet part and the side magnet part. In the magnetic gap formed by the center magnet.
The sound emitting device according to claim 2, wherein the central magnet comprises: two first magnets;

The two first voice coils have the same size and are arranged side by side in the magnetic gap formed by the first magnet and the side magnet part.
The sound generating device according to claim 2, wherein the supporting member comprises a frame portion adjacent to the first diaphragm and having a hollow, and a central portion adjacent to the second diaphragm; the central portion is relatively located on the frame The central area of the part, and is supported on the frame body part by the connecting part, and a gap is formed between the central part and the frame body part;

The central magnet and the first washer are sequentially arranged on the surface of the central part facing the first diaphragm.
The sounding device according to claim 4, wherein the side magnet part comprises a side magnet and a side washer which are sequentially arranged on the surface of the frame body part facing the second diaphragm; the first voice coil Suspended in the magnetic gap formed by the center magnet, the first washer and the side magnets and the frame; the second voice coil is suspended in the center magnet, the center and the side magnets, and the side washer In the magnetic gap.
The sounding device according to claim 2, wherein the side magnet part includes a side magnet and a side washer; the housing includes a first housing and a second housing, and the support member is injection molded on the On the first shell, the edge washers are injection molded on the second shell.
The sounding device according to claim 6, wherein the magnetic circuit system further comprises: a second magnet, and the second voice coil is suspended in a magnetic gap formed by the second magnet and the side magnet part in.
7. The sound generating device according to claim 7, wherein the number and arrangement of the second voice coil and the first voice coil are the same.
The sound generating device according to any one of claims 7 or 8, wherein the supporting member has a flat structure, and the second magnet and the second washer are sequentially arranged on the surface of the supporting member.
The sounding device according to claim 1, further comprising: two sets of centering support pieces, the two sets of centering support pieces are respectively arranged between the first vibration system and the second vibration system , The centering support piece is provided with a pad, and the two sets of the centering support piece are conducted through a metal insert to access an external electric signal.
An electronic product, characterized in that it includes:

The sound generating device of any one of claims 1-10;

The main body of an electronic product, wherein the sound generating device is arranged in the main body of the electronic product, and the main body of the electronic product has a sound outlet through which the sound generated by the sound generating device is transmitted.