WO2020215785A1

WO2020215785A1 - Vibrating sound production apparatus and electronic product

Info

Publication number: WO2020215785A1
Application number: PCT/CN2019/129739
Authority: WO
Inventors: 朱跃光; 史德璋; 毛东升; 刘春发
Original assignee: 歌尔股份有限公司
Priority date: 2019-04-23
Filing date: 2019-12-30
Publication date: 2020-10-29
Also published as: CN110113696A; CN110113696B

Abstract

Disclosed in the present invention are a vibrating sound production apparatus and an electronic product. The apparatus comprises a housing, a fixed piece, and a driving assembly. At least a portion of the housing is configured to vibrate relative to the fixed piece. The driving assembly comprises at least one wire coil and a Halbach magnet, the wire coil being fixedly connected to the fixed piece and the Halbach magnet being fixedly connected to the housing, or the Halbach magnet being fixedly connected to the fixed piece and the wire coil being fixedly connected to the housing. The plane on which the wire coil is located is perpendicular to the portion of the housing used for vibration, the wire coil is positioned at a side portion of the Halbach magnet, an annular end surface of the wire coil faces the Halbach magnet, and the wire coil passes through the strengthened region of the magnetic field of the Halbach magnet.

Description

Vibration sound device and electronic product

Technical field

The present invention relates to the technical field of electro-acoustic conversion, and more specifically, to a vibration and sound device and an electronic product.

Background technique

The sound device is an important electro-acoustic transducer element in electronic products, which is used to convert current signals into sound. With the rapid development of electronic products in recent years, sound generating devices applied to electronic products have also been improved accordingly.

The principle adopted by the traditional sound device used for the handset of the mobile phone is that the diaphragm pushes the air to vibrate to produce sound. Recently, as full screens have become the main development direction of mobile phones, how to realize the earpiece function under the non-opening design of the screen while having a better listening experience is a technical problem currently facing. In this regard, those skilled in the art have developed a technical solution using screen vibration to produce sound.

A technical solution adopted by those skilled in the art is shown in Fig. 1. The technical solution adopts a structural distribution mode in which an electromagnet 02 and a magnet 03 are placed opposite each other, and the electromagnet 02 is turned on and off, or the magnetic poles of the electromagnet 02 are switched. , So that the electromagnet 02 and the magnet 03 produce varying adsorption and repulsion. Then the magnet 03 is fixed on the mobile phone screen 01, and the electromagnet 02 is fixed on the stationary part of the mobile phone, so that the mobile phone screen 01 can vibrate.

In this technical solution, it is assumed that the vertical displacement is x, the attraction between the two magnets, and there is a displacement-related force F(x) between the first magnet and the second magnet. The restoring force of the screen’s own stiffness is F(kmsx), and there is a state of force balance at this time

After the coil of the electromagnet 02 is energized, the magnetic field between the two magnets is disturbed, so the force between the electromagnet 02 and the magnet 03 is broken, for example: the current enhances the magnetic field of the same direction of attraction, so the two magnets There will be a tendency to approach each other, and the screen will have a reverse restoring force and a damping force during movement, so the equation of motion is:

Among them, B is the equivalent magnetic induction intensity, H is the equivalent magnetic field intensity, and S is the equivalent area of the interaction between the two permanent magnets.

However, this technical solution also has the problem of occupying a large space, which is not conducive to the lightweight and thin structure design of the mobile phone. In order to make the mobile phone screen 01 produce a large enough amplitude, enough space should be left between the two magnets, otherwise it will cause a collision between the magnet and the electromagnet 02, which will seriously affect the acoustic performance of the screen. For this reason, it will inevitably take up more space in the thickness direction of the mobile phone.

In addition, magnets are usually monolithic magnets, which have low magnetic field density, low magnetic field utilization, and low driving force for electronic products.

Summary of the invention

An object of the present invention is to provide a new technical solution for a vibration and sound device and an electronic product.

According to the first aspect of the present invention, there is provided a vibration and sound device. The device includes a housing, a fixing part, and a drive assembly; at least part of the housing is configured to vibrate relative to the fixing part; the drive assembly includes at least one coil and a Halbach magnet, the coil and the fixing part Fixed connection, the Halbach magnet is fixedly connected to the housing, or the Halbach magnet is fixedly connected to the fixing member, and the coil is fixedly connected to the housing; the plane where the coil is located is connected to the housing Vertical to the part of the vibration, the coil is located on the side of the Halbach magnet, the ring-shaped end surface of the coil faces the Halbach magnet, and the coil passes through the magnetic field enhancement area of the Halbach magnet.

Optionally, there are at least two sets of Halbach magnets, a gap is formed between two adjacent sets of Halbach magnets, and the coil is located in the gap.

Optionally, each group of the Halbach magnets includes three permanent magnets arranged along the vibration direction. The magnetization direction of the permanent magnets at both ends is perpendicular to the vibration direction, and the magnetization direction is opposite. The direction is parallel to the vibration direction; the magnetizing directions of the permanent magnets at the two ends of the vibration direction of the adjacent two groups of Halbach magnets are the same, and the magnetizing directions of the permanent magnets at the middle are opposite.

Optionally, the drive assembly further includes a protective shell, and the Halbach magnet is fixedly connected to the vibration part of the shell through the protective shell.

Optionally, the protective shell includes a side edge and an open end surrounded by the side edge, and the coil extends into the protective shell from the open end, and is located in two groups adjacent to the side edge. A magnetic conductive plate is provided on a side of the Halbach magnet away from the gap.

Optionally, a through hole is provided in the middle of the coil, and a wiring area of the coil is around the through hole, and the wiring area includes a first wiring area close to a part for vibration of the housing and a section A second wiring area away from the part for vibration of the housing, the wiring directions of the first wiring area and the second wiring area are parallel to the surface of the vibration part of the housing;

A magnetic field is formed between the permanent magnets of the vibrating part of the adjacent two sets of Halbach magnets close to the housing, and the first wiring area passes through the magnetic field; A magnetic field is formed between the permanent magnets of the vibrating part away from the housing, and the second wiring area passes through the magnetic field.

Optionally, it further includes a lower case, the coil is fixed on the lower case, and the lower case is fixedly connected to the fixing member.

Optionally, it further includes a maglev permanent magnet, the maglev permanent magnet is arranged on the lower shell, and the maglev permanent magnet repels the Halbach magnet.

Optionally, a convex structure is formed in the middle of the lower shell, the coil is fixed on the convex structure, the maglev permanent magnet is arranged on at least one side of the convex structure, and the Halbach magnet Arranged opposite to the maglev permanent magnet; or

The lower shell is a sheet structure, the maglev permanent magnet is arranged on the lower shell, and the coil is arranged on the maglev permanent magnet.

Optionally, the protective shell is made of magnetically conductive material.

Optionally, the vibrating part of the housing is a screen or a back cover opposite to the screen.

According to another aspect of the present invention, an electronic product is provided. The product includes: the above-mentioned vibration and sound device; a product body, the fixing member is a part of the structure of the product body, and the driving assembly is arranged in the product body.

Optionally, the fixing member is a middle frame, PCB or side wall in the main body of the product.

According to an embodiment of the present disclosure, compared with the prior art, the vibration and sound device provided by the present invention can directly drive at least local vibration of the housing on the one hand.

On the other hand, it can better protect the shell and reduce the risk of damage to the shell. The coil and the Halbach magnet are directly arranged on the fixing member and the housing, respectively, to directly drive the housing, ensuring high efficiency of vibration transmission. The direct driving method of directly connecting the driving component and the vibrating component simplifies the principle of driving the housing to vibrate, and the housing can directly vibrate after being subjected to ampere force. This design method effectively improves the vibration conversion efficiency, and does not need to cause resonance through the vibration of the vibrator to drive the housing to vibrate. This design makes the amplitude generated by the housing basically the same as the amplitude generated by the drive assembly, and the space reserved for the drive assembly can be designed according to the performance requirements of the housing amplitude. There is no need to reserve a vibration space for the drive component that is significantly larger than the maximum amplitude of the housing.

On the other hand, the Halbach magnet forms a magnetic field enhancement area, and the coil is located in the magnetic field enhancement area. Compared with ordinary magnets, Halbach magnets have high magnetic field density, high utilization rate of magnetic field, and large driving force. The ampere force received by the coil can be larger and more balanced. The vibration of the vibrating component is more stable and stronger, and the vibration speed is faster. .

On the other hand, the vibration and sound device adopts a split design, no shrapnel is required between the protective shell and the fixing part, and the installation flexibility is higher.

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 side sectional view of a technical solution for screen sound generation in the prior art.

Figure 2 is an exploded view of the driving assembly of the vibration and sound device provided by the present invention.

Fig. 3 is a side cross-sectional view of a vibration and sound device provided by the present invention.

Fig. 4 is a schematic side sectional view of another vibration and sound device provided by the present invention

Figure 5 is a side cross-sectional view of a vibration and sound device provided by the present invention from another angle.

Fig. 6 is a perspective view of the vibration and sound device provided by the present invention without a protective cover.

Fig. 7 is a side cross-sectional view of an electronic product provided by the present invention.

Fig. 8 is a partial enlarged view of Fig. 7.

Detailed ways

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

The invention provides a vibration and sound device. The sound device includes a vibration component and a driving component. As shown in Figures 2 and 3, the vibration assembly includes a housing and a fixing member. At least a part of the housing is configured to vibrate relative to the fixing member. The housing has a sufficiently large vibration area. For example, the part of the housing for vibration is the screen 20 or the back cover 22 opposite to the screen 20. The following takes the screen 20 as an example for description. The fixing part may be a fixed part in the electronic product applied to the sound generating device, or may be a fixed part configured separately.

As shown in FIG. 8, the driving assembly includes at least one coil 16 and Halbach magnet 10. The coil 16 is wound in one direction by a wire to form a closed loop structure. The coil 16 has a through hole in the middle. Around the through hole is the routing area of the coil 16. The wiring area refers to the area through which the leads in the coil 16 actually pass, and the entire wiring area is ring-shaped.

For example, the wiring area includes a first wiring area 16a close to the vibrating part of the housing (for example, the screen 20) and a second wiring area away from the vibrating part of the housing 16b, the wiring directions of the first wiring area 16a and the second wiring area 16b are parallel to the surface of the vibration part of the housing;

The coil 16 is fixedly connected to the fixing member. For example, the coil 16 is directly and fixedly connected to the fixing member, or indirectly fixedly connected to the fixing member through other components (for example, the lower shell). The Halbach magnet 10 is fixedly connected to the housing. For example, the drive assembly also includes a protective case. The Halbach magnet 10 is fixed in the protective shell 11. Preferably, the protective shell 11 is made of a magnetically conductive material, such as low carbon steel, SPCC, and the like. The protective shell 11 made of magnetic conductive material can effectively reduce magnetic leakage. The protective shell 11 is fixedly connected to the screen 20. The coil 16 will continuously heat up during the electrification process. If the coil 16 is fixedly connected to the screen 20, the heat is likely to cause damage to the screen 20. In this example, the coil 16 is fixedly connected to the fixing member instead of the screen 20, which can effectively prevent the heating of the coil 16 from causing damage to the screen 20.

In addition, since it is provided on the fixing member, the connection between the coil 12 and the external circuit is easier.

In other examples, the Halbach magnet is fixedly connected to the fixing member, and the coil is fixedly connected to the housing.

The coil 16 in a closed loop has its own axis. In the embodiment of the present invention, the axis of the coil 16 is parallel to the surface of the screen 20. As shown in FIG. 8, the plane where the coil 16 is located and the screen vertical. As shown in FIG. 3, the protective shell 11 includes a side edge and an open end 23 surrounded by the side edge. The coil 16 extends into the protective shell 11 from the open end 23.

The Halbach magnet is located on the side of the coil 16. The Halbach magnet includes multiple permanent magnets, which are arranged in an array to form a magnetic field enhancement area at a set position. For example, the magnetic field enhancement area is located on the side of the permanent magnet whose magnetization direction is perpendicular to the vibration direction. For example, Halbach magnets are a group of magnets. The vibration direction is the vertical direction, and the magnetic field enhancement area is formed on the opposite sides of the horizontally magnetized permanent magnets of the group of magnets. There is one coil 16 and is located on one side of the Halbach magnet; or there are two coils 16 and each is located on both sides of the Halbach magnet.

In an example, as shown in FIGS. 2-4, the Halbach magnets 10 are at least two groups. For example, it can be 2 groups, 3 groups, 4 groups, and so on. Each group of Halbach magnets are arranged along the direction of vibration. A gap 24 is formed between the two adjacent sets of Halbach magnets. In each gap 24, a coil 16 is provided. When there are multiple coils 16, the driving force of the driving assembly is greater. The gap 24 is a magnetic field enhancement area of the Halbach magnet 10, the coil 16 is located in the gap 24, and the wiring area passes through the magnetic field generated by the Halbach magnet 10. In the embodiment shown in Figs. 3 and 4, the lines are routed inward and outward along the paper surface. The Halbach magnet 10 can generate a magnetic field, and at least one of the first wiring area 16 a and the second wiring area 16 b needs to pass through the magnetic field generated by the Halbach magnet 10. In this way, when an alternating current signal is passed through the coil 16, an ampere force can be generated between the coil 16 and the Halbach magnet 10. The energized trace area passes through the magnetic field and can generate ampere force. Since the coil 16 is located in the gap 24 formed by the Halbach magnet 10, at least a part of the magnetic field generated by the Halbach magnet 10 can pass through the coil 16 in a direction parallel to the surface of the screen 20, thereby generating a direction perpendicular to the screen 20. The ampere force of the surface.

Since the coil 16 and the Halbach magnet 10 are respectively arranged on the fixing member and the screen 20, and the current signal passing through the coil 16 is an alternating signal, the direction of the generated ampere force also changes alternately and reversely. The ampere force can be directly transmitted to the screen 20 through the drive assembly. The protective shell 11 can directly drive the screen 20 after receiving the ampere force. The above-mentioned ampere force will cause relative displacement between the screen 20 and the fixing member, which in turn makes the screen 20 vibrate and sound relative to the fixing member.

Compared with the prior art, the vibration and sound device provided by the present invention can directly drive at least part of the housing (for example, the screen 20 or the back cover 22) to vibrate.

On the other hand, the casing (for example, the screen 20 or the back cover 22) can be better protected, and the risk of damage to the casing can be reduced. Taking the embodiment shown in FIG. 8 as an example, the coil 16 and the Halbach magnet 10 are respectively arranged on the fixing member and the housing, and directly drive the housing to ensure high efficiency of vibration transmission. The direct driving method of directly connecting the driving component and the vibrating component simplifies the principle of driving the housing to vibrate, and the housing can directly vibrate after being subjected to ampere force. This design method effectively improves the vibration conversion efficiency, and does not need to cause resonance through the vibration of the vibrator to drive the housing to vibrate. This design makes the amplitude generated by the housing basically the same as the amplitude generated by the drive assembly, and the space reserved for the drive assembly can be designed according to the performance requirements of the housing amplitude. There is no need to reserve a vibration space for the drive component that is significantly larger than the maximum amplitude of the housing.

On the other hand, the Halbach magnet forms a magnetic field enhancement area, and the coil 16 is located in the magnetic field enhancement area. Compared with ordinary magnets, Halbach magnets have high magnetic field density, high utilization rate of the magnetic field, and large driving force. The ampere force received by the coil 16 can be larger and more balanced. The vibration of the vibrating component is more stable and stronger, and the vibration speed is higher. fast.

Preferably, as shown in FIG. 2, each group of the magnets includes three permanent magnets arranged along the vibration direction, which are respectively counted as the first permanent magnet 13, the second permanent magnet 14 and the third permanent magnet 15. A gap 24 is formed between the two sets of magnets. The magnetizing direction of the permanent magnets at the two ends is perpendicular to the vibration direction, and the magnetizing direction is opposite; the magnetizing direction of the permanent magnets at the middle is parallel to the vibration direction. The vibration direction is the direction when the vibrating component vibrates. The magnetizing directions of the permanent magnets located at the two ends of the vibration direction of the adjacent two sets of Halbach magnets are the same, and the magnetizing directions of the permanent magnets located in the middle are opposite.

For example, as shown in Figures 3-4, the first permanent magnet 13a located in the left row (the end far from the gap 24 is S pole, the end close to the gap 24 is N pole) and the third permanent magnet 15a located in the left row (far away One end of the gap 24 is the N pole, and the end close to the gap 24 is the S pole). The magnetizing direction is perpendicular to the vibration direction, and the magnetizing directions of the two are opposite. The first permanent magnet 13a located in the left row (the end far from the gap 24 is S pole, the end close to the gap 24 is N pole) and the first permanent magnet 13b located in the right row (the end far from the gap 24 is the N pole, which is close to the gap One end of 24 is S pole) correspondingly, the magnetizing direction of the two is the same. The second permanent magnet 14a in the left row (the end close to the open end 23 is S pole, the end far from the open end 23 is N pole) and the second permanent magnet 14b in the right row (the end close to the open end 23 is N pole) , The end away from the open end 23 is the S pole) corresponding, the magnetizing direction of the two is parallel to the vibration direction, and the magnetizing direction is opposite. The third permanent magnet 15a located in the left row (the end far from the gap 24 is the N pole, the end close to the gap 24 is the S pole) and the third permanent magnet 15b located in the right row (the end far from the gap 24 is the S pole, which is close to the gap One end of 24 is N pole) correspondingly, the magnetizing direction of the two is perpendicular to the vibration direction, and the magnetizing direction is the same.

In this example, the magnetic field strength in the gap 24 formed between two adjacent sets of Halbach magnets is the largest. The driving force of the vibrating component is the largest, and the starting speed is fast.

Of course, the permanent magnets in each group are not limited to three, and there may be more. The magnetizing direction of the permanent magnets at both ends of each group of Halbach magnets is perpendicular to the direction of vibration, and the magnetizing direction is opposite; the magnetizing direction of the permanent magnets located in the middle is parallel to the direction of vibration, and the magnetic fields of each permanent magnet are connected paramagnetically. , That is, the N pole of the adjacent permanent magnet is opposite to the S pole. In this way, the magnetic field strength in the gap 24 can be greater.

Of course, the Halbach magnet is not limited to the above embodiments, and those skilled in the art can make selections according to actual needs.

Preferably, as shown in FIG. 5, the main body direction of the Halbach magnet 10 is parallel to the long side of the coil 16. The main body direction is the extending direction of the longest side of the Halbach magnet 10. The long side of the coil 16 is the longest side of the coil 16. With this arrangement, the effective area of the Halbach magnet 10 and the coil 16 is the largest, and the ampere force formed between the two is the largest.

In other examples, the Halbach magnet 10 is not limited to the above structure, and those skilled in the art can set it according to actual needs.

Preferably, as shown in FIGS. 2-4, the Halbach magnets 10 are at least two groups. A magnetic conductive plate 12 is provided on the side away from the gap 24 of the two sets of Halbach magnets adjacent to the side of the protective shell. That is, the outermost two sets of Halbach magnets are provided with magnetic conductive plates 12 on the side away from the gap. The magnetically conductive plate 12 is made of a magnetically conductive material, such as low carbon steel, SPCC, etc. The magnetic conductive plate 12 can gather the magnetic lines of induction, reduce the occurrence of magnetic leakage, and further increase the magnetic field strength in the gap 24.

Preferably, as shown in FIGS. 3-4, a magnetic field is formed between the permanent magnets (for example, the first

permanent magnets

13a, 13b) close to the screen 20 of the two sets of Halbach magnets. The wire area 16a passes through the magnetic field; a magnetic field is formed between the permanent magnets (for example, the third

permanent magnets

15a, 15b) of the two adjacent groups of the magnets away from the screen 20, and the second wire routing area 16b passes through The magnetic field. In this example, the two routing areas respectively pass through magnetic fields at different locations. This makes the driving force of the vibrating assembly significantly improved.

Preferably, as shown in FIGS. 2-5, the driving assembly further includes a lower shell 18. The coil 16 is fixed on the lower shell 18, the lower shell 18 is fixedly connected with the fixing member, and the end of the protective shell 11 opposite to the lower shell 18 is open. The lower shell 18 can be provided with a larger connection area according to actual needs, which facilitates the connection of the drive assembly and the fixing member.

Preferably, under the condition that the lower shell 18 is made of a magnetically conductive material, the magnetic flux leakage of the maglev permanent magnet 17 can be reduced. However, the magnetically conductive material and the Halbach magnet 10 form a static magnetic field force, and the two attract each other. This will cause the screen 20 and the fixing member to approach each other. In order to solve this technical problem, the drive assembly also includes a maglev permanent magnet 17. The maglev permanent magnet 17 is arranged on the lower shell 18, and the maglev permanent magnet 17 repels the magnet. The maglev permanent magnet 17 and the Halbach magnet 10 form a repulsive force, which can balance the force of the static magnetic field.

In addition, the maglev permanent magnet 17 can generate centering damping, which improves the transient response.

In addition, the maglev permanent magnet 17 can play a buffering function, and can buffer the impact force received by the screen 20, thereby preventing the screen 20 from being damaged by the frequently changing ampere force.

Of course, regardless of whether the lower shell is made of magnetically conductive material, the maglev permanent magnet 17 and the Halbach magnet form a repulsive force, and the maglev permanent magnet 17 can generate centering damping, prevent the vibration of the Halbach magnet from deviating, and improve the transient response. After the power is cut off, the Halbach magnet can quickly stop vibrating under the repulsive force of the maglev permanent magnet 17.

On the other hand, the maglev permanent magnet 17 acts as a buffer to buffer the impact force received by the screen 20, thereby preventing the screen 20 from being damaged by the frequently changing ampere force.

Preferably, a convex structure 19 is formed in the middle of the lower shell 18. The protrusion structure 19 is a strip-shaped protrusion or a dot-shaped protrusion. The coil 16 is fixed on the convex structure 19. For example, the coil 16 is fixed on the convex structure 19 by an adhesive. The maglev permanent magnet 17 is located on at least one side of the protruding structure 19. In this embodiment, the maglev permanent magnet 17 includes two sets of magnets, and the two sets of magnets are respectively fixed on both sides of the protruding structure 19. For example, each group of magnets may include only one magnet or multiple magnets. The Halbach magnets 10 are in two groups, and are respectively arranged opposite to the two groups of magnets. In this example, the magnetization direction of the maglev permanent magnet 17 is perpendicular to the vibration direction and is the same as the magnetization direction of the permanent magnet near the lower case 18 to form a repulsive force. For example, as shown in FIG. 4, the magnetizing direction of the third permanent magnet 15a located in the left row is the same as the magnetizing direction of the maglev permanent magnet 17 located on the left, thereby forming a repulsive force. The magnetizing direction of the third permanent magnet 15b located in the right row is the same as the magnetizing direction of the maglev permanent magnet 17 located on the right, thereby forming a repulsive force. The protruding structure 19 makes the positioning of the coil 16 and the maglev permanent magnet 17 more accurate. The maglev permanent magnet 17 arranged separately has a smaller overall volume and has less interference with the magnetic field in the gap 24.

Alternatively, as shown in FIG. 3, the lower shell 18 has a sheet-like structure. The maglev permanent magnet 17 is an integral structure. For example, the maglev permanent magnet 17 is an integral sheet structure, and its magnetizing direction is perpendicular to the vibration direction. The maglev permanent magnet 17 is arranged on the lower shell 18. For example, the maglev permanent magnet 17 is fixed on the lower shell 18 by bonding, clamping, or the like. The coil 16 is arranged on the maglev permanent magnet 17. For example, the coil 16 is bonded to the maglev permanent magnet 17 by an adhesive. The two ends of the maglev permanent magnet 17 perpendicular to the vibration direction have the strongest magnetism, and the magnetism of the two ends is the same as that of the corresponding Halbach magnet 10 near the corresponding end to form a repulsive force. For example, as shown in FIG. 4, the third permanent magnet 15a on the left has an N pole at one end away from the gap 24, and the left end of the maglev permanent magnet 17 has an N pole, thereby forming a repulsive force. The end of the third permanent magnet 15b on the right side away from the gap 24 is an S pole, and the right end of the maglev permanent magnet 17 is an S pole, thereby forming a repulsive force. The integrated magnetic levitation permanent magnet 17 is easier to install.

Of course, the arrangement of the maglev permanent magnet 17 is not limited to the above-mentioned embodiment, and those skilled in the art can make the arrangement according to actual needs.

The invention also provides an electronic product. Electronic products can be but not limited to mobile phones, laptops, electronic watches, tablet computers, walkie-talkies, etc.

As shown in Figures 7-8, the electronic product includes the vibration and sound device provided by the present invention and the product body. The screen 20 is arranged on the product body and used as a display screen of an electronic product. The screen 20 can be arranged in a form such that one end is rotatably connected to the product body and the other end is freely movable; or, the screen 20 can also be made of a material with good elastic deformation ability, and the screen 20 is fixedly connected to the other with one end. The fixed part and the other end are arranged in a freely movable form. In this way, the screen 20 can vibrate relative to the product body. A part of the structure of the product body can be used as the fixing member, and the drive assembly is arranged in the product body. For example, the protective shell 11 and the Halbach magnet 10 are fixedly arranged on the screen 20, and the coil 16 is fixedly arranged on a part of the product body that is equivalent to a fixing member. The ampere force generated by the driving component can drive the screen 20 to vibrate and produce sound. Because the electronic product provided by the present invention adopts the vibration and sound device provided by the present invention, it occupies less space in the thickness direction of the electronic product parallel to the screen 20, which is more conducive to the design of the electronic product thinner and meets the needs of electronic products. Lightweight design requirements.

Preferably, the fixing member may be a structure such as a middle frame 21, a PCB, a side wall and the like in the product body. In the main body of the product, in order to install other electronic devices, the main body of the product is often equipped with structural components such as partitions and middle frame 21. A back cover 22 is provided on the side of the middle frame 21 opposite to the screen. These structural components have good structural stability in electronic products. On the one hand, they are used in case electronic devices, and on the other hand, they are used to protect electronic devices. Therefore, using such structural parts in the main body of the product as the fixing parts can increase the conversion rate of ampere force into vibration and improve the reliability of vibration. The inner surface of the side wall of the product body can also serve as the fixing member.

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 vibration and sound device, which is characterized in that it comprises a housing, a fixing part and a driving component;

At least a part of the housing is configured to be able to vibrate relative to the fixing member;

The driving assembly includes at least one coil and a Halbach magnet, the coil is fixedly connected to the fixing member, the Halbach magnet is fixedly connected to the housing, or the Halbach magnet is fixedly connected to the fixing member, The coil is fixedly connected to the housing;

The plane where the coil is located is perpendicular to the part for vibration of the housing, the coil is located on the side of the Halbach magnet, the ring end face of the coil faces the Halbach magnet, and the coil passes through the Halbach magnet. The magnetic field enhancement area of the Halbach magnet.
The vibrating and sounding device according to claim 1, wherein there are at least two sets of Halbach magnets, a gap is formed between two adjacent sets of Halbach magnets, and the coil is located in the gap.
The vibration and sound device according to claim 2, wherein each group of the Halbach magnets includes three permanent magnets arranged along the vibration direction, and the magnetization direction of the permanent magnets at both ends is perpendicular to the vibration direction, and the magnetization The direction is opposite, the magnetizing direction of the permanent magnet located in the middle is parallel to the vibration direction; the magnetizing direction of the permanent magnets located at both ends of the vibration direction of the two adjacent groups of Halbach magnets is the same, and the magnetizing direction of the permanent magnets located in the middle is the same in contrast.
The vibrating and sounding device according to claim 2, wherein the driving assembly further comprises a protective shell, and the Halbach magnet is fixedly connected to the vibration part of the shell through the protective shell.
The vibrating and sounding device according to claim 4, wherein the protective shell comprises a side edge and an open end surrounded by the side edge, and the coil extends into the protective shell from the open end, A magnetic conductive plate is arranged on the side away from the gap of the two sets of Halbach magnets adjacent to the side.
The vibration and sound device according to claim 3, wherein the coil has a through hole in the middle, and the through hole is surrounded by a wiring area of the coil, and the wiring area includes a section of The first wiring area of the vibrating part and a section of the second wiring area away from the vibrating part of the housing, and the wiring directions of the first wiring area and the second wiring area are parallel to the housing The surface of the part used for vibration;

A magnetic field is formed between the permanent magnets of the vibrating part of the adjacent two sets of Halbach magnets close to the housing, and the first wiring area passes through the magnetic field; A magnetic field is formed between the permanent magnets of the vibrating part away from the housing, and the second wiring area passes through the magnetic field.
The vibration and sound device according to claim 1, further comprising a lower shell, the coil is fixed on the lower shell, and the lower shell is fixedly connected to the fixing member.
The vibrating and sounding device according to claim 7, further comprising a maglev permanent magnet, the maglev permanent magnet is arranged on the lower shell, and the maglev permanent magnet repels the Halbach magnet.
The vibration and sound device according to claim 8, wherein a convex structure is formed in the middle of the lower shell, the coil is fixed on the convex structure, and the magnetic suspension permanent magnet is arranged on the convex structure. On at least one side of the structure, the Halbach magnet and the maglev permanent magnet are arranged opposite to each other; or

The lower shell is a sheet structure, the maglev permanent magnet is arranged on the lower shell, and the coil is arranged on the maglev permanent magnet.
The vibration and sound device according to claim 4, wherein the protective shell is made of magnetic conductive material.
The vibration and sound device according to claim 1, wherein the vibrating part of the housing is a screen or a back cover opposite to the screen.
An electronic product, characterized in that it includes:

The vibration and sound device according to any one of claims 1-11;

The product main body, the fixing member is a part of the structure of the product main body, and the driving assembly is arranged in the product main body.
The electronic product according to claim 12, wherein the fixing member is a middle frame, PCB or side wall of the product body.