WO2020147540A1

WO2020147540A1 - Sound generation apparatus and electronic device

Info

Publication number: WO2020147540A1
Application number: PCT/CN2019/128432
Authority: WO
Inventors: 马江羽; 葛连山
Original assignee: 歌尔股份有限公司
Priority date: 2019-01-15
Filing date: 2019-12-25
Publication date: 2020-07-23
Also published as: CN209267799U

Abstract

Disclosed are a sound generation apparatus and an electronic device. The sound generation apparatus comprises: a housing, a cavity being formed inside the housing; a magnetic circuit system comprising a magnetic yoke, a central magnetic portion, and side magnetic portions, wherein the magnetic yoke comprises a first support portion, a second support portion, and a connecting portion, the second support portion is opposite to a through hole and is positioned on a different surface from the first support portion, the central magnetic portion is provided on the second support portion, the side magnetic portions are provided on the first support portion, a gap is formed between the central magnetic portion and each side magnetic portion, and at least two opposite sides, located in the gap, of the connecting portion are subjected to material removing treatment and a material removing space is configured to be at least used for reducing the local width of the gap.

Description

Sound generating device and electronic equipment

Technical field

The present invention relates to the field of electro-acoustic conversion technology, and more specifically, to a sound generating device and electronic equipment.

Background technique

In the existing double-sided sound generating device, a bowl-shaped magnetic yoke is usually used to support the central magnetic circuit assembly. The side wall of the bowl-shaped magnetic yoke is arranged around the central magnetic circuit assembly in a full circle. The two voice coils are respectively located inside and outside the side wall of the bowl-shaped yoke. The diameters of the two voice coils are different.

Since the side walls of the bowl-shaped magnetic yoke occupy the internal space of the double-sided sounding device, the gap between the central magnetic circuit and the side magnetic circuit components is large, and the volume of the central magnetic part and/or the side magnetic part is small. And/or the space utilization of the side magnetic part is low, so that the magnetic induction intensity of the magnetic gap is small, the driving force of the two voice coils is small, and the loudness of the double-sided sound device is small.

Therefore, it is necessary to provide a new technical solution to solve the above technical problems.

Summary of the invention

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

According to the first aspect of the present invention, a sound generating device is provided. The sound generating device includes: a housing, a cavity is formed in the housing; a magnetic circuit system, the magnetic circuit system includes a yoke, a central magnetic part and an edge magnetic part, the yoke includes a first support part, The second supporting part and the connecting part are provided with a through hole in the middle of the first supporting part, and the second supporting part is opposite to the through hole and is located on a different surface from the first supporting part. A central magnetic part is provided on a surface of the second support part close to the first support part, and the edge magnetic part is provided on a surface of the first support part close to the second support part, A first magnetic gap is formed between the central magnetic portion and the first support portion, a second magnetic gap is formed between the side magnetic portion and the second support portion, and the connecting portion connects the first The inner edge of the supporting portion and the outer edge of the second supporting portion, at least two opposite sides of the connecting portion are processed for material removal, and the material removal space is configured to at least reduce the central magnetic portion and the side magnetic portion The local width of the gap between them; a first vibration system, the first vibration system including a first voice coil, the first voice coil is inserted into the first magnetic gap; and a second vibration system, the first The two vibration system includes a second voice coil inserted into the second magnetic gap.

Optionally, at least two opposite sides of the connecting portion located in the magnetic gap are subjected to material removal processing to form a hollow structure.

Optionally, the connecting portion includes two opposite first sides parallel to each other and two opposite second sides for connecting the two first sides, and the at least two opposite sides include the The two opposite first sides and/or the two opposite second sides.

Optionally, the at least two opposite sides include the two opposite first sides, the connecting portion includes a connecting plate, and the connecting plate is formed on the two opposite second sides; or The at least two opposing sides include the two opposing second sides, the connecting portion includes a connecting plate, and the connecting plate is formed on the two opposing first sides.

Optionally, the at least two opposite sides include the two opposite first sides and the two opposite second sides, the two first sides and the two second sides Are connected to form four corners, and the connecting portion includes a connecting pillar, and the connecting pillars are two, and are located at two opposite corners, the middle of the two first sides, or the two first sides. The middle of the two sides; or the number of the connecting posts are four, and they are located at the four corners, or the middle of the two first sides and the middle of the two second sides.

Optionally, the one with the smaller outer diameter of the first voice coil and the second voice coil is recessed at a position corresponding to the connecting column to form an escape structure.

Optionally, there are two connecting posts and they are respectively located at two opposite corners, or there are four connecting posts and they are respectively located at four corners; the first voice coil and the second voice coil The coils form rounded corners at respective corners, and the connecting posts are located between the corresponding rounded corners of the first voice coil and the rounded corners of the second voice coil.

Optionally, the fillet radius of the outer one of the first voice coil and the second voice coil is smaller than the fillet radius of the inner one.

Optionally, the sound emitting device is rectangular or racetrack-shaped.

According to another aspect of the present disclosure, an electronic device is provided. The electronic device includes a casing and the above-mentioned sounding device, the sounding device is arranged in the casing, and a sounding hole is provided on the casing, and the sounding hole is communicated with the sounding hole of the sounding device.

According to an embodiment of the present disclosure, the sound generating device has the characteristic of high loudness.

Other features and advantages of the present invention will become clear by the following detailed description of exemplary embodiments of the present invention with reference to the drawings.

BRIEF DESCRIPTION

The drawings incorporated in and forming a part of the specification illustrate embodiments of the present invention, and together with the description serve to explain the principles of the present invention.

Fig. 1 is an exploded view of a sound emitting device according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a magnetic yoke according to an embodiment of the present disclosure.

Fig. 3 is a cross-sectional view along the long axis of the sound emitting device according to an embodiment of the present disclosure.

Fig. 4 is a cross-sectional view along a minor axis of a sound emitting device according to an embodiment of the present disclosure.

Fig. 5 is a schematic structural diagram of a second type of magnetic yoke according to an embodiment of the present disclosure.

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

Fig. 7 is a top view of a part of another sound emitting device according to an embodiment of the present disclosure.

Fig. 8 is a corrosion diagram of a part of still another sound emitting device according to an embodiment of the present disclosure.

Fig. 9 is a schematic structural diagram of an electronic device according to the present disclosure.

Description of reference signs:

13: first diaphragm; 14: first voice coil; 15: center magnet; 16: side magnet; 17: middle shell; 18: yoke; 19: lower magnetic plate; 20: second voice coil; 21: The second diaphragm; 22: the first support part; 23: the second support part; 24: hollow structure; 25: connecting plate; 26: connecting column; 27: material removal space; 28: fillet of the first voice coil ; 29: rounded corners of the second voice coil; 30: avoidance structure; 32: shell; 33: sound device; 34: sound hole.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that 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 unless specifically stated otherwise.

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

Techniques, methods and equipment known to those of ordinary skill in the related art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the specification.

In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not 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, therefore, once an item is defined in one drawing, there is no need to discuss it further in subsequent drawings.

According to an embodiment of the present disclosure, a sound emitting device 33 is provided. As shown in Figs. 1-4, the sound generating device 33 includes a housing, a magnetic circuit system, a first vibration system, and a second vibration system. The first vibration system and the second vibration system are respectively located on the upper and lower sides of the magnetic circuit system. The two vibration systems share a magnetic circuit system for sound production. The whole of the sounding device 33 may be, but not limited to, a circular structure, a rectangular structure or a racetrack-shaped structure. The following is an example of a rectangular structure or a racetrack-shaped structure.

A cavity is formed inside the housing. For example, the casing includes an upper casing, a middle casing 17 and a lower casing. The upper shell, middle shell 17 and lower shell are enclosed to form a cavity inside them. The first vibration system and the second vibration system are respectively suspended on the upper and lower ends of the magnetic circuit system.

The magnetic circuit system includes a central magnetic part and a side magnetic part. The magnetic circuit system is installed in the cavity through the yoke 18. The central magnetic part includes a central magnet 15 and an upper magnetic conductive plate. The side magnetic part includes a side magnet 16 and a lower magnetic conductive plate 19. The yoke 18, the upper magnetic conductive plate and the lower magnetic conductive plate 19 are made of magnetic conductive material, The role of gathering and guiding the direction of magnetic lines of force. For example, the middle shell 17 is a frame structure surrounded by side walls. The frame structure is hollow. The magnetic circuit system is fixed in the frame structure.

As shown in Fig. 2 or 5, the yoke 18 has a bowl shape as a whole. The yoke 18 includes a first support portion 22, a second support portion 23, and a connecting portion for connecting the first support portion 22 and the first support portion 22. A through hole 12 is provided in the middle of the first supporting portion 22. The second supporting portion 23 is disposed opposite to the through hole 12 and is located on a different surface from the first supporting portion 22. Since the first supporting portion 22 and the second supporting portion 23 are located on different planes, after the installation is completed, the outer side surface of the central magnetic portion and the inner side surface of the side magnetic portion can be arranged oppositely.

As shown in FIGS. 3-4, the central magnetic part is arranged on the surface of the second supporting part 23 close to the first supporting part 22. For example, the surface is a flat surface and the central magnetic part is fixed by an adhesive.

The edge magnet part is provided on the surface of the first support part 22 close to the second support part 23. For example, the surface is a flat surface and the edge magnet part is fixed by an adhesive.

As shown in FIGS. 3, 4 and 6, a first magnetic gap is formed between the central magnetic portion and the first support portion 22, and a second magnetic gap is formed between the side magnetic portion and the second support portion 23. The first vibration system includes a first voice coil 14. The first voice coil 14 is inserted into the first magnetic gap via the through hole 12. The second vibration system includes a second voice coil 20. The second voice coil 20 is inserted into the second magnetic gap via the outside of the second support portion 23. The outer diameter of the first voice coil 14 is smaller than or equal to the inner diameter of the second voice coil 20. One end of the first voice coil 14 away from the magnetic circuit system is connected to the first diaphragm 13. The edge of the first diaphragm 13 is fixed around one end of the middle shell 17. The end of the second voice coil 20 away from the magnetic circuit system is connected to the second diaphragm 21. The edge of the second diaphragm 21 is fixed around the other end of the middle shell 17. The connecting portion is located between the first voice coil 14 and the second voice coil 20.

Preferably, the difference in the effective radiation area of the first diaphragm 13 and the second diaphragm 21 is ≤20%. The effective radiation area refers to the area of the effective vibration part of the diaphragm. For example, if the diaphragm is a folded ring diaphragm, the folded ring part and the central part are effectively vibrating. For example, if the diaphragm is a flat diaphragm, the part within the edge is the effective vibration part. When the difference in the effective radiation area of the first diaphragm 13 and the second diaphragm 21 is within the above range, the amplitudes of the two diaphragms are equivalent, and the effect of vibration superposition is more obvious.

For example, the sounding device 33 also includes two centering pieces. Two centering fins are respectively attached to the surfaces of the first diaphragm 13 and the second diaphragm 21, for example, the surfaces of the two diaphragms opposite to each other. The first voice coil 14 and the second voice coil 20 are respectively connected to an external circuit through two centering branches to receive electrical signals.

2 and 5, the connecting portion is connected between the inner edge of the first supporting portion 22 and the outer edge of the second supporting portion 23. At least two opposite sides of the connecting part are processed for material removal. Removal processing refers to removing at least part of the material located on two sides, for example, removing a part of the material along the thickness direction. The blanking space 27 is configured to at least reduce the partial width of the gap between the central magnetic part and the side magnetic part. Alternatively, the material removal process can also be understood as the lack of material in at least two opposite edges of the connecting portion.

In an example, as shown in FIGS. 2 and 5, at least two opposite sides of the connecting portion located in the gap between the central magnetic portion and the side magnetic portion are subjected to material removal processing to form a hollow structure 24. The hollow structure 24 refers to removing the two sides as a whole. In this way, the space inside the cavity can be utilized to the maximum, and the width of the gap between the central magnetic part and the side magnetic part can be made smaller.

Reducing the width of the gap between the central magnetic portion and the side magnetic portion generally includes: reducing the width of the gap by increasing the width of the central magnetic portion and/or the side magnetic portion. In this way, on the one hand, due to the increase in the mass of the magnet, the magnetic induction in the two magnetic gaps can be significantly increased; on the other hand, the reduction in the width of the gap itself can more effectively gather the magnetic field, thereby increasing the magnetic induction. .

Or, by moving the side magnetic part, the distance between at least part of the side magnetic part and the central magnetic part is reduced. In this way, since the distance between the central magnetic part and the side magnetic parts is reduced, the magnetic induction intensity of the magnetic fields in the two magnetic gaps can be significantly improved. In addition, because the space utilization rate in the cavity is improved, the volume of the sound generating device 33 with the same loudness can be made smaller.

Both of the above two methods can increase the loudness of the sound generating device 33.

In one example, the first vibration system and the second vibration system can work simultaneously. The two acoustic signals can be superimposed on each other, thereby further improving the loudness of the sound generating device 33. In another example, the first vibration system and the second vibration system can also selectively work in time periods and have independent functions.

In one example, the connecting portion includes two opposite first sides parallel to each other and two opposite second sides for connecting the two first sides. For example, as shown in FIG. 2, when the sound emitting device 33 is rectangular, the two sides parallel to the long axis (as shown in A in FIG. 1) are the two first sides, and the short axis (as shown in B in FIG. 1) Show) The two parallel sides are the two second sides. In other examples, the two sides parallel to the long axis are two second sides, and the two sides parallel to the short axis are two first sides.

When the sounding device body is in the shape of a racetrack, the whole of the magnetic yoke is in a racetrack shape. The two straight sides are two first sides, and the two arc-shaped sides are two second sides.

At least two opposite sides include two opposite first sides and/or two opposite second sides.

As shown in Figure 3-4, when removing the material on the two first sides parallel to the long axis. The connecting part includes a connecting plate 25. The two second sides are connected to the first supporting portion 22 and the second supporting portion 23 through two connecting plates 25 respectively. The length of the connecting plate 25 is equal to the length of the first side or the second side, and the connecting plate 25 penetrates the entire first side or the second side. It may also be that the length of the connecting plate 25 is smaller than the length of the first side or the second side, and the connecting plate 25 is provided on a part of the first side or the second side.

In this example, since the length of the first side is greater than the length of the second side, the gap between the central magnetic part and the side magnetic part can be minimized, so it is compared with the two sides parallel to the minor axis. The material removal process, the magnetic field strength in the two magnetic gaps of the sound generating device 33 formed in this way is higher, the driving force is greater, and the loudness is greater.

When cutting the material on the two first sides parallel to the short axis. The connecting part includes a connecting plate 25. The two second sides are respectively used to connect the first supporting portion 22 and the second supporting portion 23 through two connecting plates 25. This way can also increase the loudness of the sounding device 33.

As shown in Figures 3, 5, and 6, when the two first sides and two second sides parallel to the long axis and the short axis are processed, the width of the gap between the central magnetic part and the side magnetic part is It can be reduced in all directions. This method can further increase the magnetic induction intensity of the magnetic field in the two magnetic gaps.

In one example, at least two opposite sides include two opposite first sides and two opposite second sides. The two first sides and the two second sides are connected to form four corners. The connection part includes a connection post 26. There are two connecting posts 26, and they are respectively located at two opposite corners, the middle of the two first sides, or the middle of the two second sides. The two connecting posts 26 are arranged symmetrically. This makes the vibration of the first vibration system and the second vibration system more balanced.

or

There are four connecting posts 26, and they are located at the four corners, or at the middle of the two first sides and the middle of the two second sides. The four connecting posts 26 are arranged symmetrically in pairs. This makes the vibration of the first vibration system and the second vibration system more balanced.

The shape of the voice coil (for example, the first voice coil 14 or the second voice coil 20) is configured to be able to form an escape from the plurality of connecting posts 26. For example, the connecting column 26 is located on the first side and/or the second side, and the first side and/or the second side of the voice coil (for example, the first voice coil 14 or the second voice coil 20) correspond to the side The corresponding position of the connecting pillar 26 protrudes outward or recesses inward to form the avoidance structure 30.

In an example, the one with the smaller outer diameter of the first voice coil 14 and the second voice coil 20 is recessed at a position corresponding to the connecting column 26 to form the avoiding structure 30. For example, as shown in FIG. 8, the outer diameter of the first voice coil 14 is smaller than the inner diameter of the second voice coil 20. When vibrating, the two voice coils can interlace in the direction of vibration. The first voice coil 14 has a special-shaped structure. In this way, the amplitude of the first vibration system and the second vibration system can be significantly increased.

For example, the connecting posts 26 are located at four corners. The first voice coil 14 is recessed at the four corners to form the avoidance structure 30, compared to the way the second voice coil 20 protrudes to form the avoidance structure 30, in this way, the first voice coil 14 and the second voice coil The ring 20 can have a larger volume, which makes the driving force of the first vibration system and the second vibration system greater.

In other examples, as shown in FIG. 7, there are two connecting posts 26 and located at two opposite corners, or four connecting posts 26 are located at four corners, respectively. The first voice coil 14 and the second voice coil 20 are rounded at respective corners. The connecting post 26 is located between the corresponding rounded corner 28 of the first voice coil and the rounded corner 29 of the second voice coil. For example, the plurality of connecting posts 26 are respectively located between the outer side of the round corner 28 of the first voice coil and the inner side of the round corner 29 of the second voice coil. In this way, the structures of the first voice coil 14 and the second voice coil 20 are simpler, the winding process of the voice coil is simpler, and the yield is high.

In other examples, only one connecting column is provided. For example, the connecting post is located at a corner or any position on the first side and the second side. Only one connection board is provided. For example, the connecting plate is located on the first side or the second side.

In one example, the yoke 18 is integrally formed. For example, the yoke 18 is integrally formed from sheet metal by stamping. For example, the yoke 18 is made of plastic material and is integrally formed by injection molding.

According to another embodiment of the present disclosure, an electronic device is provided. Electronic devices can be, but are not limited to, mobile phones, laptops, tablets, game consoles, smart watches, televisions, walkie-talkies, etc.

As shown in FIG. 9, the electronic device includes a housing 32 and the aforementioned sounding device 33. The sound emitting device 33 is provided in the housing 32. A sounding hole 34 is provided on the housing 32. The sound hole 34 communicates with the sound hole of the sound device 33. For example, the housing 32 includes side frames. A sounding hole 34 is opened on the side frame. The sound emitting device 33 is fixed on the inner side of the side frame.

The electronic device has the characteristics of good sound effect.

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 it comprises:

A housing, forming a cavity inside the housing;

A magnetic circuit system, the magnetic circuit system includes a magnetic yoke, a central magnetic part and a side magnetic part, the magnetic yoke comprises a first supporting part, a second supporting part and a connecting part, and a central part of the first supporting part is provided A through hole, the second support portion is opposite to the through hole and is located on a different surface from the first support portion,

The central magnetic portion is provided on a surface of the second support portion close to the first support portion, and the edge magnetic portion is provided on a surface of the first support portion close to the second support portion Above, a first magnetic gap is formed between the central magnetic portion and the first support portion, and a second magnetic gap is formed between the side magnetic portion and the second support portion,

The connecting portion connects the inner edge of the first support portion and the outer edge of the second support portion, and at least two opposite sides of the connecting portion are processed for material removal, and the material removal space is configured for at least Reduce the local width of the gap between the central magnetic part and the side magnetic part;

A first vibration system, the first vibration system includes a first voice coil, the first voice coil is inserted into the first magnetic gap; and

The second vibration system includes a second voice coil, and the second voice coil is inserted into the second magnetic gap.
The sounding device according to claim 1, wherein at least two opposite sides of the connecting portion are processed to form a hollow structure.
The sounding device according to claim 1, wherein the connecting portion comprises two opposite first sides parallel to each other and two opposite second sides for connecting the two first sides, so The at least two opposite sides include the two opposite first sides and/or the two opposite second sides.
The sounding device according to claim 3, wherein the at least two opposite sides include the two opposite first sides, the connecting portion includes a connecting plate, and the connecting plate is formed on the opposite side. On the two second sides of; or

The at least two opposite sides include the two opposing second sides, and the connecting portion includes a connecting plate formed on the two opposite first sides.
The sounding device according to claim 3, wherein the at least two opposite sides include the two opposite first sides and the two opposite second sides, and the two first sides One side is connected to the two second sides to form four corners, the connecting portion includes a connecting column, and the connecting column is two, and they are respectively located at two opposite corners and the two first The middle of one side or the middle of the two second sides; or

There are four connecting posts, and they are located at four corners, or at the middle of the two first sides and the middle of the two second sides.
5. The sound emitting device according to claim 5, wherein the one with the smaller outer diameter of the first voice coil and the second voice coil is recessed at a position corresponding to the connecting column to form an escape structure.
The sound generating device according to claim 5, wherein there are two connecting posts and are respectively located at two opposite corners, or there are four connecting posts and they are respectively located at four corners; The first voice coil and the second voice coil form rounded corners at respective corners, and the connecting post is located between the corresponding rounded corners of the first voice coil and the second voice coil.
7. The sound generating device according to claim 7, wherein the round radius of the outer one of the first voice coil and the second voice coil is smaller than the round radius of the inner one.
The sounding device according to claim 1, wherein the sounding device is rectangular or racetrack-shaped.
An electronic device, comprising a housing and the sounding device according to any one of claims 1-9, the sounding device is arranged in the housing, and a sounding hole is provided on the housing , The sound hole is communicated with the sound hole of the sound device.