CN111901734B

CN111901734B - Sound generator and electronic product comprising same

Info

Publication number: CN111901734B
Application number: CN202011058048.XA
Authority: CN
Inventors: 朱熹; 周昌国; 刘光磊
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-02-09
Anticipated expiration: 2040-09-30
Also published as: WO2022068082A1; CN111901734A

Abstract

The invention discloses a sounder and an electronic product comprising the same, comprising: a housing; a magnetic circuit system located in the housing; the magnetic circuit system comprises a side magnetic part and a central magnetic part; the central magnetic part comprises a supporting plate positioned in the middle; and two central magnets respectively positioned at two sides of the supporting plate; the central magnetic part is of a hollow-out structure; two groups of vibration assemblies are respectively positioned on two sides of the supporting plate, and each group of vibration assemblies comprises a vibration diaphragm and a voice coil; the sounder further comprises a centering structure located on the inner side of the central hollow edge of the central magnetic part, the centering structure comprises two annular frameworks which are respectively connected and fixed on the central parts of the two vibrating diaphragms, the adjacent ends of the two annular frameworks are connected and fixed with elastic supporting parts, and the outer edges of the elastic supporting parts are connected and fixed on the central magnetic part at the hollow edge. The invention can reduce the polarization generated when the double vibrating diaphragms in the bidirectional sounder structure vibrate, reduce the product distortion and improve the performance and the stability of the product.

Description

Sound generator and electronic product comprising same

Technical Field

The invention relates to the technical field of electroacoustic conversion. And more particularly, to a sounder and an electronic product including the same.

Background

Currently, a sound generator is widely used as an important component of a terminal having an audio playing function. Some terminals, especially portable terminals such as mobile phones, tablet computers and earphones can provide a very limited installation space for the sound generator, so that the existing sound generator which can be applied to a narrow installation space usually adopts a structure that a single vibrating diaphragm sounds from the front side.

In recent years, with the rapid development of the related technologies of electronic products, in order to achieve better performance, those skilled in the art have improved the features of electronic products, such as structure.

The bidirectional sounder has the advantages that the sounder is formed by two sets of vibration systems and magnetic circuits and can sound bidirectionally, due to the structural design characteristics of the bidirectional sounder, when the bidirectional sounder works, the double vibrating diaphragms vibrate in different directions at the same time, the polarization condition of a product is very serious, the sounder has a peak value on a frequency response curve near the lowest resonant frequency of the sounder, and distortion is easily caused due to the fact that the amplitude of the vibrating diaphragms is too large.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a dual-diaphragm acoustic generator, which reduces the polarization generated when the dual diaphragm vibrates in the structure of the dual-diaphragm acoustic generator, reduces the distortion of the product, and improves the performance and stability of the product.

It is another object of the present invention to provide an electronic product including the sounder as described above to optimize the overall performance of the electronic product.

In order to achieve the purpose, the invention adopts the following technical scheme:

according to one aspect of the invention, there is provided a sounder comprising:

a housing;

a magnetic circuit system located in the housing; the magnetic circuit system comprises a side magnetic part and a central magnetic part;

the central magnetic portion includes:

the supporting plate is fixedly connected with the shell relatively and is positioned in the middle; and two central magnets respectively positioned at two sides of the supporting plate; the central magnetic part is of a hollow-out structure;

the side magnetic part surrounds the outer sides of the two central magnets; a magnetic gap is formed between the central magnet and the side magnet part;

two groups of vibration assemblies respectively positioned at two sides of the supporting plate, wherein each group of vibration assemblies comprises a vibrating diaphragm and a voice coil which is combined and fixed on the vibrating diaphragm, and the two voice coils are respectively suspended in the magnetic gaps;

the sounder further comprises a centering structure located on the inner side of the central hollow edge of the central magnetic part, the centering structure comprises two annular frameworks which are respectively connected and fixed on the central parts of the two vibrating diaphragms, the two annular frameworks are arranged along the vibrating direction of the vibrating diaphragm, the adjacent ends of the two annular frameworks are connected and fixed with elastic supporting parts, and the outer side edges of the elastic supporting parts are connected and fixed on the central magnetic part of the hollow edge.

In addition, it is preferable that the two annular frameworks are coaxially arranged in the vibration direction of the diaphragm.

In addition, preferably, the centering structure comprises two elastic supporting parts, the two elastic supporting parts are respectively located on two sides of the supporting plate, and the adjacent ends of the two annular frameworks are respectively connected and fixed on the central magnetic part at the hollowed-out edge through one elastic supporting part.

Furthermore, it is preferable that the elastic support member includes a central portion connected to the annular frame in an opposing manner and an elastic portion located outside the rim of the annular frame;

the central part comprises a plurality of air holes.

In addition, preferably, the centering structure comprises an elastic supporting piece, and the two annular frameworks comprise a large-diameter annular framework and a small-diameter annular framework;

the adjacent ends of the two annular frameworks are respectively connected and fixed on the surfaces of the two sides of the elastic supporting piece, and the outer side edges of the elastic supporting piece are connected and fixed on the central magnetic part at the hollowed-out edge.

Furthermore, it is preferable that the elastic support includes a central portion and an elastic portion located outside a rim of the central portion; the end part of the small-diameter annular framework, which is close to the elastic supporting part, is fixedly connected to the central part or the elastic part;

the end part of the large-diameter annular framework close to the elastic supporting part is fixedly connected to the elastic part.

In addition, it is preferable that the diaphragm, the annular skeleton and the elastic support member on one side of the support plate form a first chamber;

the vibrating diaphragm, the annular framework and the elastic supporting piece positioned on the other side of the supporting plate form a second chamber;

a third chamber is formed between the two elastic supporting pieces;

and acoustic materials are contained in the first cavity, the second cavity and/or the third cavity.

In addition, it is preferable that the diaphragm and the annular skeleton located on one side of the support plate form a fourth chamber with the elastic support member;

the vibrating diaphragm and the annular framework which are positioned on the other side of the supporting plate form a fifth chamber with the elastic supporting piece;

acoustic materials are contained in the fourth chamber and/or the fifth chamber;

the elastic supporting piece is provided with a plurality of air holes for communicating the fourth cavity and the fifth cavity.

In addition, preferably, the central hollow edge of the supporting plate includes an extending portion extending inwards for connecting and fixing with one end of the elastic portion far away from the central portion.

According to another aspect of the present invention, the present invention also provides an electronic product, comprising:

a product body, and a sounder as described above;

the sounder is fixedly combined in the product main body, and the product main body comprises a sound outlet which is used for transmitting the sound generated by the sounder.

The invention has the following beneficial effects:

1. compared with the existing bidirectional sounder structure, the sounder provided by the invention utilizes the design of the centering structure, and can effectively improve the polarization phenomenon generated when the double vibrating diaphragms in the bidirectional sounder structure vibrate.

2. The problem of asymmetric elastic distribution of the two vibrating diaphragms can be effectively solved by utilizing the configuration that the lengths of the annular frameworks in the vibrating direction of the vibrating diaphragms can be equal or unequal.

3. The sounder provided by the invention changes the size of a cavity formed by the vibrating diaphragm, the annular framework and the elastic supporting piece or between the two elastic supporting pieces by adjusting the forming style of the centering structure, fills or sets the acoustic materials with the same or different materials aiming at the cavities with the same or different volumes, can improve the polarization of products, improve the performance of products, optimize the airflow and pressure distribution of a rear sound cavity, and adjust the direct current bias of the two-way sounder, so that the vibration displacement amounts (opposite or reverse directions) of the two vibrating diaphragms of the two-way sounder are more symmetrical, the vibration states of the vibrating diaphragms of the two vibration systems are also closer, the vibration symmetry of the two vibrating diaphragms is effectively improved, and the low-frequency effect and the reliability of the sounder are improved.

4. The sounder provided by the invention adjusts the vibration states of the vibrating diaphragms of the two vibration systems to be closer through the design of the centering structure, and in addition to solving the polarization problem generated during the vibration of the double vibrating diaphragms, the sounder can not generate additional acting force to act on a product during positive and negative bidirectional sounding, and the product can not generate the condition that the sound production effect of the product is influenced by vibration sound and the like.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 shows a schematic side cross-sectional view of an embodiment of the sounder provided by the invention.

Fig. 2 shows a schematic side cross-sectional view of another embodiment of the sounder provided by the present invention.

Fig. 3 shows a schematic diagram of five mark points for diaphragm polarization test.

Fig. 4 is a diagram showing the vibration effect of the conventional bidirectional sounder diaphragm at five marked points as shown in fig. 3.

Fig. 5 is a diagram illustrating the vibration effect of the sounder diaphragm according to the present invention, as shown in fig. 3 at five marked points.

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: the relative arrangement of the components and steps, the 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 merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

The present invention provides a sounder, as shown in conjunction with fig. 1 or 2, comprising:

a housing 1;

a magnetic circuit system located in the housing 1; the magnetic circuit system comprises a side magnetic part 4 and a central magnetic part;

the central magnetic part includes: a support plate 2 which is fixedly connected with the shell relatively and is positioned at the middle position; and two central magnets 3 respectively positioned at both sides of the support plate 2; the central magnetic part is of a hollow-out structure. In the invention, the support plate 2 is of a flat plate structure and is used for supporting the central magnet, in the structure shown in the figure, two central magnets 3 are respectively arranged at the upper side and the lower side of the edge of a central hollow 21 of the support plate 2, the central magnets 3 are of an annular structure, the support plate 2 is used for supporting and fixing the central magnets 3, optionally, the outer edge of the support plate 2 is fixedly connected with the sounder shell 1 to provide a supporting function, and the support plate 2 can be made of a magnetic conductive material or a non-magnetic conductive material. In particular, the magnetizing directions of the two central magnets 3 are perpendicular to the plate surface of the support plate 2, namely the magnetic pole directions are perpendicular to the plate surface of the support plate.

The supporting plate 2 is a magnetic conduction structure, and the magnetic poles of the two central magnets 3 close to the supporting plate 2 are the same-polarity magnetic poles. That is, the magnetic pole direction of the central magnet 3 located above the support plate 2 is up N down S, the magnetic pole direction of the central magnet 3 located below the support plate 2 is up S down N, and the two central magnets 3 are close to each other and have the same magnetic pole as the magnetic pole of the support plate 2. In another embodiment, the magnetic pole direction of the central magnet located above the support plate is up S down N, the magnetic pole direction of the central magnet located below the support plate is up N down S, and the magnetic poles close to the support plate are like magnetic poles, which is not limited in the present invention. Through the design mode, the upper central magnet and the lower central magnet can be combined into a whole magnet, and the continuity and the integrity of a magnetic circuit in the double-sided sound production device are improved. The magnetic field utilization rate in the double-sided sound production device can be improved. Alternatively, in other embodiments, the magnetic poles of the two central magnets near the support plate are opposite magnetic poles. That is, the magnetic pole direction of the central magnet above the supporting plate is up N down S, the magnetic pole direction of the central magnet below the supporting plate is up N down S, and the two central magnets are close to each other and have opposite magnetic poles with the magnetic poles of the supporting plate. In another embodiment, the magnetic pole direction of the central magnet located above the support plate is up S down N, the magnetic pole direction of the central magnet located below the support plate is up S down N, and the magnetic poles of the two central magnets close to the support plate are opposite magnetic poles, which is not limited in the present invention.

The side magnetic part 4 surrounds the two central magnets 3, and a magnetic gap is formed between the central magnets 3 and the side magnetic part 4. The sounder structure provided by the invention comprises two groups of vibration assemblies which are respectively positioned at two sides of the supporting plate 2, each group of vibration assemblies comprises a vibrating diaphragm 5 and a voice coil 6 which is combined and fixed on the vibrating diaphragm 5, and the two voice coils 6 are respectively suspended in the magnetic gap.

In this embodiment, the two center magnets may have the same size and shape, and further, the magnetic gap formed corresponding to the two center magnets may have the same shape and size based on the same shape and size of the two center magnets. The two voice coils are the same in size and shape and are respectively suspended in the two magnetic gaps. The voice coil with the same size design is adopted, so that the space is saved, and the space utilization rate of the double-sided sound production device is improved. And, through the configuration to the magnetic pole direction of center magnet, can effectively improve the magnetic field utilization ratio in the two-sided sound production device, provide stronger magnetic field for the voice coil loudspeaker voice coil, and then improve the vibration performance of voice coil loudspeaker voice coil and vibrating diaphragm.

Preferably, the voice coil 6 and the diaphragm 5 of the two vibration assemblies are configured to be capable of vibrating in opposite directions at the same time. For example, when the voice coil 6 and the diaphragm 5 located above the support plate 2 vibrate upward, the voice coil 6 and the diaphragm 5 located below the support plate 2 vibrate downward. Such an embodiment can increase acoustic pressure of the acoustic generator. Under the condition that the two paths of current signals which are introduced into the sound generator and used for generating sound are the same, the two groups of vibration assemblies can generate the same amplitude, so that the sound pressure of the sounder can be superposed in a doubling mode, and the loudness of the sounder is greatly increased.

Optionally, the winding direction of the two voice coils assembled in the sound generator and the direction of the supplied current cooperate with the magnetic field direction in the sound generator so that the voice coils 6 and the diaphragms 5 of the two vibration assemblies are configured to vibrate in opposite directions at the same time, which is not limited by the present invention.

In order to solve the above problems, in combination with fig. 1 or fig. 2, the sounder provided by the present invention further includes a centering structure located inside the central hollow edge of the central magnetic part, and the polarization phenomenon generated when the dual diaphragms vibrate in the bidirectional sounder structure can be effectively improved by using the design of the centering structure. Specifically, the centering structure includes two

annular skeletons

71, 72 that are annular structures that are fixed in respectively connecting on two vibrating diaphragms 5 central parts, and two

annular skeletons

71, 72 set up along vibrating diaphragm 5 vibration direction, and the end connection that is close to of two

annular skeletons

71, 72 is fixed with elastic support 8, and elastic support 8's outside edge connection is fixed on the central magnetism portion at fretwork edge.

Fig. 1 shows an embodiment of the sounder according to the present invention, in which the centering structure includes two elastic supporting

members

81, 82, the two elastic supporting

members

81, 82 are respectively located at two sides of the supporting plate 2, and the adjacent ends of the two

annular frameworks

71, 72 are respectively connected and fixed to the central magnetic portion or the supporting plate through one elastic supporting

member

81, 82. Specifically, the elastic support 81 on the upper side of the support plate 2 is correspondingly and oppositely connected with the annular framework 71 on the upper side of the support plate 2, and the elastic support 82 on the lower side of the support plate 2 is correspondingly and oppositely connected with the annular framework 72 on the lower side of the support plate 2. The elastic supporting piece provides support for the vibrating diaphragm, the annular framework is utilized to provide centering for the vibrating diaphragm so as to improve the polarization effect of the vibrating diaphragm, and the elastic supporting piece further comprises a deformable elastic part with elasticity. Specifically, in the sounder structure shown in fig. 1, a central magnetic conductive plate 31 is further disposed on a surface of the central magnet 3 away from the support plate 2. In this embodiment, the end of the elastic portion far from the central portion is connected and fixed to the central magnetic conductive plate 31, that is, the annular frame 71 located on the upper side of the support plate 2 is connected and fixed to the central portion 811 of the elastic support 81 located on the upper side of the support plate 2, and the end of the elastic portion 812 of the elastic support 81 far from the central portion 811 is connected and fixed to the central magnetic conductive plate 31. Correspondingly, the annular frame 72 located at the lower side of the support plate 2 is fixedly connected to the central portion 821 of the elastic support 82 located at the lower side of the support plate 2, and an end portion of the elastic portion 822 of the elastic support 82 far from the central portion 821 is fixedly connected to the central magnetic conducting plate 31. In the embodiment shown in fig. 1, the elastic supporting

members

81 and 82 are symmetrically disposed with respect to the supporting plate 2, and in other embodiments, the elastic supporting

members

81 and 82 may also be asymmetrically disposed with respect to the supporting plate 2, that is, the lengths of the annular frame 71 and the annular frame 72 in the vibrating direction of the vibrating diaphragm are not equal, for example, the end of the elastic portion of the elastic supporting member above the supporting plate far from the central portion is connected and fixed to the central magnet above the central hollow edge of the supporting plate, or the end of the elastic portion of the elastic supporting member below the supporting plate far from the central portion is connected and fixed to the central magnet below the central hollow edge of the supporting plate. Above-mentioned structural design can solve two vibrating diaphragms elasticity and distribute asymmetric problem to further effectively improve two vibrating diaphragms vibration polarization serious problem.

Alternatively, the material of the ring frames 71, 72 includes, but is not limited to, Paper, Kapton (polyimide (PI) film material), foam, carbon fiber material, metal material such as aluminum foil/magnesium aluminum alloy/magnesium lithium alloy, plastic material such as PEN (polyethylene naphthalate)/PI (polyimide)/LCP (Liquid Crystal Polymer)/PC (polycarbonate)/PPA (Polyphthalamide), or porous material. The elastic supporting

members

81 and 82 are made of metal, and in an alternative embodiment, the elastic supporting members may be made of mesh.

In the present invention, the central magnetic conductive plate 31 is configured to play a role of restraining and concentrating the magnetic field generated by the central magnet 3, and guide the magnetic field to the magnetic gap and the position of the peripheral edge magnetic part. Optionally, in an embodiment that the edge magnet is used, edge magnetic conductive plates may be further disposed on the upper and lower end surfaces of the edge magnet. The side magnetic conducting plate is configured to play a role in restraining and concentrating a magnetic field generated by the side magnet, guide the magnetic field to the magnetic gap and the position of the central magnet in the central area, increase the concentration of magnetic lines of force in the magnetic gap, and enhance the magnetic field intensity sensed by the voice coil in the magnetic gap. The central magnetic conduction plate and the side magnetic conduction plates have the advantages that the magnetic field intensity and the magnetic field uniformity in the magnetic gap can be effectively improved, so that the voice coil can be subjected to stronger Lorentz force and further converted into vibration amplitude. The magnetic field generated by the magnet can be more effectively utilized by utilizing the magnetic conduction plate.

In addition, the balance between the two vibration systems in the sounder is considered, other additional factors which enable the two vibrating diaphragms to generate polarization phenomena are avoided, and the two annular frameworks are coaxially arranged in the vibrating direction of the vibrating diaphragms. Preferably, the centering structure is coaxially arranged with the two diaphragms and the two voice coils.

In an alternative embodiment, the

annular frameworks

71 and 72 may extend into the central magnetic field, i.e. on the basis of the sounder structure shown in fig. 1, the adjacent ends of the

annular frameworks

71 and 72 are close to each other, and the ends of the elastic parts of the elastic supports at the two sides of the support plate far from the central part are connected and fixed on the central magnet. The part of the annular skeleton near the near end of the sounder with the structure can generate mutual induction with the acting force of the magnetic field of the magnetic circuit system, thereby improving the integrity and the continuity of the magnetic field and the application efficiency of the magnetic field and obtaining better polarization improvement effect. And the design also has the advantages of simple assembly process, good coordination between the two diaphragms and the like. Particularly, the lower the resistivity of the annular framework is, the better the polarization effect is improved, the distortion of the product can be effectively reduced, and the low-frequency performance of the product can be improved, so that the annular framework can be made of any one of silver, copper, aluminum and the like optionally.

In another variant, the end of the elastic part of the elastic support element located on the upper side of the support plate, which is far from the central part, and the end of the elastic part of the elastic support element located on the lower side of the support plate, which is far from the central part, may be respectively and fixedly connected to the support plate in a relative manner.

In a preferred embodiment, the diaphragm 5, the annular skeleton 71 and the elastic support 81, which are located above the support plate 2, form a first chamber; the diaphragm 5, the annular skeleton 72 and the elastic support 82 below the support plate form a second chamber; a third chamber is formed between the two

elastic supports

81, 82; and acoustic materials are contained in the first cavity, the second cavity and/or the third cavity. To ensure that the gas can flow between the first chamber, the second chamber and the third chamber, the central portion 811 of the elastic supporting member 81 and the central portion 821 of the elastic supporting member 82 each include a plurality of ventilation holes. The sounder provided by the invention changes the size of a cavity formed by the vibrating diaphragm, the annular framework and the elastic supporting piece or between the two elastic supporting pieces by adjusting the forming style of the centering structure, fills or sets the acoustic materials with the same or different materials aiming at the cavities with the same or different volumes, can improve the polarization of products, improve the performance of products, optimize the airflow and pressure distribution of a rear sound cavity, and adjust the direct current bias of the two-way sounder, so that the vibration displacement amounts (opposite or reverse directions) of the two vibrating diaphragms of the two-way sounder are more symmetrical, the vibration states of the vibrating diaphragms of the two vibration systems are also closer, the vibration symmetry of the two vibrating diaphragms is effectively improved, and the low-frequency effect and the reliability of the sounder are improved.

The acoustic material is used for absorbing part of sound energy and is equivalent to enlarging the volume of a rear sound cavity of the acoustic generator, so that the effects of reducing the low-frequency response frequency of the acoustic generator and expanding the bandwidth are achieved. The acoustic material includes, but is not limited to, sound-absorbing powder, sound-absorbing cotton, and the sound-absorbing powder is made of one or a mixture of more of activated carbon, natural zeolite powder, molecular sieve, polysilicon, and nanotube, but is not limited to the above, as long as the material is powder or fine particles with sound-absorbing function, and the invention is not limited thereto.

Fig. 2 shows another embodiment of the sounder according to the invention, in which the centering structure comprises a resilient support member 8, the two annular frames comprising a large diameter annular frame and a small diameter annular frame; the adjacent ends of the two

annular frameworks

71 and 72 are respectively connected and fixed on the two side surfaces of the elastic support member 8, and the outer edge of the elastic support member 8 is connected and fixed on the central magnetic part of the hollowed-out edge. The elastic supporting member 8 provides support for the vibrating diaphragm 5, and uses the

annular skeletons

71 and 72 to respectively provide centering for the two vibrating diaphragms 5 to improve the polarization effect of the vibrating diaphragm, and the elastic supporting member 8 includes an elastic portion 802 having elasticity and being deformable, so that in this embodiment, the elastic supporting member 8 includes a central portion 801 which can be oppositely connected with the

annular skeletons

71 and 72, and an elastic portion 802 located outside the edge of the annular skeleton 8. The embodiment shown in fig. 2 is the same as the embodiment shown in fig. 1 in design of utilizing the centering structure, and can effectively improve the polarization phenomenon generated when the dual diaphragm vibrates in the bidirectional sounder structure. Because two vibrating diaphragms 5 that are located backup pad 2 both sides vibrate to equidirectional vibration simultaneously when vibrating, when two

annular skeletons

71, 72 are the same diameter setting, must cause two annular skeletons to be non-coaxial setting, can cause two vibrating diaphragms not harmonious when vibrating, produce the polarization, and consider the equilibrium between two vibration systems in the sounder, avoid introducing other additional factors that make two vibrating diaphragms produce polarization phenomenon between, and then refer to fig. 2, the diameter of the annular skeleton 71 of configuration on backup pad 2 top vibrating diaphragm 5 is greater than the diameter of the annular skeleton 72 of configuration on backup pad 2 below vibrating diaphragm 5. In the vibration direction of the diaphragm 5, the two

annular bobbins

71, 72 are coaxially disposed. Alternatively, in other embodiments, the diameter of the annular skeleton disposed on the diaphragm below the support plate may be larger than the diameter of the annular skeleton disposed on the diaphragm above the support plate.

In this embodiment, in order to ensure that when the vibrating diaphragms located at two sides of the supporting plate vibrate in different directions at the same time, the

annular frameworks

71 and 72 use one elastic supporting member 8 to achieve the technical effect of improving the polarization generated by the two vibrating diaphragms, the adjacent ends of the annular framework 71 and the annular framework 72 need to have the ability of moving in different directions at the same time, and as shown in fig. 2, the end portion, close to the elastic supporting member 8, of the small-diameter annular framework 72 disposed on the vibrating diaphragm 5 below the supporting plate 2 is fixedly connected to the central portion 801 or the elastic portion 802; the end of the large-diameter ring-shaped bobbin 71 disposed on the diaphragm 5 above the support plate 2 adjacent to the elastic support member 8 is fixedly connected to the elastic portion 802. That is, the elastic part 802 of at least a part of the elastic support member 8 is included between the end of the annular skeleton 72 close to the elastic support member 8 and the end of the annular skeleton 71 close to the elastic support member 8, so that the centering structure can act on two diaphragms simultaneously, and a foundation is provided for improving the polarization phenomena of the two diaphragms.

In the embodiment shown in fig. 2, a central magnetic conductive plate 31 is further disposed on a surface of the central magnet 3 away from the support plate 2. The edge of the central hollow 21 of the supporting plate 2 includes an extending portion 22 extending inward for connecting and fixing with one end of the elastic portion 802 far from the central portion 801. In other embodiments, an end of the elastic portion away from the central portion may be connected and fixed to the central magnetic portion on the upper side or the lower side of the support plate, or when the sound generator structure includes the central magnetic conductive plate, an end of the elastic portion away from the central portion may be connected and fixed to the central magnetic conductive plate on the upper side or the lower side of the support plate. Therefore, by utilizing the configuration that the lengths of the annular framework 71 above the supporting plate 2 and the annular framework 72 below the supporting plate 2 in the vibration direction of the vibrating diaphragm 5 are equal or unequal, the problem of asymmetric elastic distribution of the two vibrating diaphragms can be solved firstly, and the serious problem of vibration polarization of the two vibrating diaphragms can be further effectively improved.

In the sounder structure shown in fig. 2, the portions of the large-diameter annular skeleton 71 and the small-diameter annular skeleton 72 near the proximal ends can generate mutual induction with the action force of the magnetic field of the magnetic circuit system, so that the integrity and the continuity of the magnetic field and the application efficiency of the magnetic field are improved, and the better polarization improvement effect is obtained. And the design also has the advantages of simple assembly process, good coordination between the two diaphragms and the like. Particularly, in this case, the lower the resistivity of the annular frameworks, the better the polarization improving effect, the distortion of the product can be effectively reduced, and the medium-low frequency performance of the product can be improved, so that the

annular frameworks

71 and 72 can be made of any one of silver, copper, aluminum and the like.

In a preferred embodiment, the diaphragm 5 and the annular skeleton 71 above the support plate 2 form a fourth chamber with the elastic support member 8; the diaphragm 5 and the annular skeleton 72 below the support plate 2 form a fifth chamber with the elastic support member 8; the fourth chamber and/or the fifth chamber comprise acoustic materials. In order to ensure the fluidity of the gas between the fourth chamber and the fifth chamber, the elastic support member 8 comprises a plurality of air holes for communicating the fourth chamber with the fifth chamber. Optionally, a fourth chamber and a fifth chamber with equal or unequal volumes are formed by using the configuration that the lengths of the annular framework 71 above the support plate 2 and the annular framework 72 below the support plate 2 are equal or unequal in the vibration direction of the vibrating diaphragm 5, and acoustic materials with the same or different materials are filled or set in the fourth chamber and/or the fifth chamber with the same or different volumes, so that the polarization of a product is improved, the performance of the product is improved, the airflow and pressure distribution of the rear sound chamber are optimized, the direct current bias of the two-way sounder is adjusted, the vibration displacement amounts (in opposite or opposite directions) of the two vibrating diaphragms of the two-way sounder are more symmetrical, the vibration states of the vibrating diaphragms of the two vibration systems are also more similar, the vibration symmetry of the two vibrating diaphragms is effectively improved, and the low-frequency effect and the reliability of the sounder are improved.

Like the embodiment shown in fig. 1, the acoustic material in this embodiment is used to absorb part of the sound energy, which is equivalent to enlarging the volume of the back sound cavity of the sounder, thereby achieving the effects of reducing the low-frequency response frequency and expanding the bandwidth of the sounder. The acoustic material includes, but is not limited to, sound-absorbing powder, sound-absorbing cotton, and the sound-absorbing powder is made of one or a mixture of more of activated carbon, natural zeolite powder, molecular sieve, polysilicon, and nanotube, but is not limited to the above, as long as the material is powder or fine particles with sound-absorbing function, and the invention is not limited thereto.

In the two sounder structures shown in fig. 1 and fig. 2, the vibration states of the diaphragms of the two vibration systems can be adjusted to be closer by the design of the centering structure, so that the sounder cannot generate additional acting force to act on a product when the sounder generates sound in positive and negative directions in addition to solving the problem of polarization generated during vibration of the double diaphragms, and the product cannot generate vibration sound and the like to influence the sound generating effect of the product.

In an alternative embodiment, as shown in fig. 1 and fig. 2, in order to increase the rigidity of the diaphragm and improve the high-frequency vibration performance of the diaphragm, a reinforcing portion 51 is usually fixed on the central portion of the diaphragm, and the reinforcing portion may also be referred to as DOME, composite layer, and is used to adjust the acoustic performance of the sound generator.

In a specific embodiment, the central portion of the diaphragm includes a reinforcing portion; the reinforcement portion with the voice coil loudspeaker voice coil is located the two opposite sides of vibrating diaphragm, and the reinforcement portion is located one side that deviates from the voice coil loudspeaker voice coil of vibrating diaphragm promptly, and the tip accessible of deviating from elastic support element of annular skeleton combines to be fixed on vibrating diaphragm central part in the mode of bonding. Optionally, an end of the annular framework facing away from the elastic supporting member passes through a central portion of the diaphragm and is fixedly combined with the reinforcing portion. In other alternative embodiments, the reinforcing part and the voice coil may also be located on the same side of the diaphragm, and an end of the annular framework away from the elastic supporting part may be fixed to the reinforcing part by bonding; or the end part of the annular framework, which is far away from the elastic supporting part, is fixedly combined on the central part of the vibrating diaphragm in a bonding mode, and the reinforcing part is positioned on the central part of the inner side of the edge of the short circuit ring.

In order to reduce the mass of the vibration system, in the field, a hollow is generally formed by removing material at a position corresponding to the reinforcement part in the central part of the diaphragm, and the reinforcement part covers the hollow formed by removing material.

Different edge magnetic parts are suitable for different product structures and have different advantages, and the invention provides the following alternative embodiments for the structural forms of the edge magnetic parts.

In two embodiments adopted in the present invention, referring to fig. 1 and fig. 2, in the scheme adopted for the structure of the side magnetic part 4, the side magnetic part 4 is made of a magnetic conductive material to modify the magnetic lines of force of the central magnet and provide more magnetic field force for the magnetic field formed by the side magnetic part 4 and the central magnet 3 at the magnetic gap. In this embodiment, the side magnet portion is an integral annular magnetically conductive side plate. The height of the annular magnetic conduction side plate is at least equal to the sum of the thicknesses of the two central magnets and the thickness of the supporting plate. The integrated annular magnetic conduction side plate surrounds the two central magnets and forms magnetic gaps with the two central magnets respectively. The annular magnetic conduction side plate can surround the part of the support plate used for bearing the central magnet, and a notch or an opening for extending out of part of the structure of the support plate can be arranged on the annular magnetic conduction side plate. Correspondingly, the supporting plate can also be provided with a part structure for extending out of the space surrounded by the annular magnetic conduction side plate so as to be fixedly connected with the shell. Since two of the central magnets can form an integral magnet, the annular magnetically conductive side plate surrounding the central magnets can also form an integral magnet. The advantage of this embodiment is that the sounder has a small number of parts, which simplifies the assembly process and saves space. The integrity and the continuity of the magnetic circuit are better, and the application efficiency of the magnetic field is improved.

In another alternative embodiment, the edge magnetic part may include two annular magnetic conductive side plates, and the two annular magnetic conductive side plates are respectively disposed on two side surfaces of the support plate. The two annular magnetic conduction side plates are respectively in one-to-one correspondence with the two central magnets, and surround the corresponding central magnets. The advantage of this kind of embodiment is that, two annular magnetic conduction curb plates split type settings need not to offer the breach that supplies it to stretch out for the backup pad. The processing difficulty of the annular magnetic conduction side plate is reduced, and the condition that the magnetic field of the central magnet is leaked outwards can be reduced.

In another optional embodiment, the side magnetic part comprises two groups of side magnets, the two groups of side magnets are respectively arranged on the surfaces of the two sides of the supporting plate, the magnetizing directions of the two groups of side magnets are perpendicular to the surface of the supporting plate, and the magnetic poles of the two groups of side magnets close to the supporting plate are the same magnetic poles; the magnetic poles of each group of the side magnets far away from the supporting plate and the magnetic poles of the center magnets surrounded by the side magnets far away from the supporting plate are opposite magnetic poles. This magnetic circuit distribution enables the edge magnets to form an integral, complete magnetic circuit with the center magnet. The edge magnets positioned on the upper side and the lower side of the supporting plate form an integral magnet to be matched with the central magnet, so that the magnetic field intensity is increased, the area covered by the magnetic field is increased, and the integral sensitivity and loudness of the sounder can be effectively improved.

For the above-mentioned embodiment using the edge magnet, the edge magnet may be a ring-shaped edge magnet or a split-type edge magnet. And by adopting the annular edge magnet, the assembly process is simpler, the magnetic gap is longer, and the improvement of the vibration sensitivity of the voice coil is facilitated. If the split type side magnets are adopted, each group of side magnets at least comprises two side magnets. A group of side magnets are arranged around the center magnet in a symmetrical and centrosymmetric mode. The split type edge magnet has the advantages that the lead wire led out from the voice coil can be conveniently extended to the position outside the edge magnetic part, and the partial structure of the supporting plate can be conveniently extended out of the edge magnetic part.

Referring to fig. 3-5, the degree of polarization P is defined as the five-point displacement of the diaphragm A, B, C, D, E, which is shown in the figure, for the conventional bi-directional sounder structure, the diaphragm is at the five marked points as shown in fig. 3

The test results of the polarization degree P are shown in fig. 4, and it can be seen that the displacement of B, C, D, E at four points is very different from the displacement of a point a in the vicinity of 250 to 300hz, and the polarization degree P is about 38.8%. And near 250-300hz, the sounder diaphragm provided by the invention is arranged at five positions as shown in figure 3The result of the test of the polarization degree P of each mark point is shown in fig. 5, it can be seen that the displacement of A, B, C, D, E five points is relatively small, the polarization degree P is about 17.6%, and the influence of the traditional technical scheme and the technical scheme provided by the invention on the polarization condition of the product is known, the product polarization condition is obviously improved by using the sounder provided by the invention, and the polarization degree is reduced by more than 50%.

According to another aspect of the present invention, the present invention further provides an electronic product, which may be a mobile phone, a tablet computer, and the like, without limitation. The electronic product comprises a product main body and the sounder as described above; the sounder is fixedly combined in the product main body, and the product main body comprises a sound outlet which is used for transmitting the sound generated by the sounder.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims

1. A sounder, comprising:

a housing;

the central magnetic portion includes:

2. A sounder according to claim 1, wherein in the direction of diaphragm vibration, the two annular armatures are coaxially arranged.

3. The sounder according to claim 1, wherein the centering structure comprises two elastic supporting members, the two elastic supporting members are respectively located at two sides of the supporting plate, and the adjacent ends of the two annular frameworks are respectively connected and fixed on the central magnetic part of the hollowed-out edge through one elastic supporting member.

4. A sounder according to claim 3, wherein said resilient support comprises a central portion in opposed connection with the annular skeleton and a resilient portion outboard of the rim of the annular skeleton;

the central part comprises a plurality of air holes.

5. A sounder according to claim 1, wherein said centering structure comprises a resilient support, the two annular armatures comprising a large diameter annular armature and a small diameter annular armature;

6. The sounder according to claim 5,

the elastic support comprises a central part and an elastic part positioned outside the edge of the central part; the end part of the small-diameter annular framework, which is close to the elastic supporting part, is fixedly connected to the central part or the elastic part;

7. A sounder according to claim 3, wherein the diaphragm, annular skeleton and resilient support member on one side of the support plate form a first chamber;

a third chamber is formed between the two elastic supporting pieces;

8. A sounder according to claim 5, wherein the diaphragm and annular skeleton on one side of the support plate form a fourth chamber with the resilient support;

9. The sounder according to claim 6, wherein the central hollowed edge of the support plate includes an inwardly extending extension for fixedly connecting to an end of the resilient portion remote from the central portion.

10. An electronic product, comprising:

a product body, and a sounder according to any one of claims 1 to 9;