CN110113696B

CN110113696B - Vibration sound production device and electronic product

Info

Publication number: CN110113696B
Application number: CN201910330099.4A
Authority: CN
Inventors: 朱跃光; 史德璋; 毛东升; 刘春发
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-10-09
Anticipated expiration: 2039-04-23
Also published as: WO2020215785A1; CN110113696A

Abstract

The invention discloses a vibration sound production device and an electronic product. The device comprises a shell, a fixing piece and a driving component; at least a portion of the housing is configured to vibrate relative to the mount; the driving assembly comprises at least one coil and a Halbach magnet, the coil is fixedly connected with the fixing piece, the Halbach magnet is fixedly connected with the shell, or the Halbach magnet is fixedly connected with the fixing piece, and the coil is fixedly connected with the shell; the plane of the coil is perpendicular to the part of the shell used for vibration, the coil is positioned on the side of the Halbach magnet, the annular end face of the coil faces the Halbach magnet, and the coil penetrates through the magnetic field enhancement area of the Halbach magnet.

Description

Vibration sound production device and electronic product

Technical Field

The invention relates to the technical field of electroacoustic conversion, in particular to a vibration sounding device and an electronic product.

Background

The sound generating device is an important electroacoustic transducer element in electronic products, and is used for converting current signals into sound. Along with the rapid development of electronic products in recent years, sound generating devices applied to the electronic products are also improved correspondingly.

The traditional sound production device for the mobile phone receiver adopts the principle that the vibrating diaphragm pushes air to vibrate and produce sound. Recently, as a comprehensive screen becomes a main development direction of a mobile phone, how to realize a receiver function under a screen non-opening design and have better listening experience is a technical problem facing the current. In this regard, those skilled in the art have developed a technical solution for sounding by using screen vibration.

One technical solution adopted by those skilled in the art is shown in fig. 1, and adopts a structural distribution mode that an electromagnet 02 and a magnet 03 are oppositely arranged, so that by turning on and off the electromagnet 02 or switching the magnetic poles of the electromagnet 02, variable adsorption and repulsion actions are generated between the electromagnet 02 and the magnet 03. Then the magnet 03 is fixed on the mobile phone screen 01, and the electromagnet 02 is fixed on a stationary part in the mobile phone, so that the mobile phone screen 01 can vibrate.

In this solution, assuming that the vertical displacement is x, an attractive force is present between the two magnets, and a force f (x) is present between the first magnet and the second magnet, which force is related to the displacement. The restoring force of the self-rigidity of the screen is F (kmsx), and a state of force balance exists at the moment

After the coil of the electromagnet 02 is energized, the magnetic field between the two magnets is disturbed, and thus the forces between the electromagnet 02 and the magnet 03 are out of balance, for example: because of the cocurrent magnetic field of the current enhanced attraction, the two magnets have a tendency to approach each other, and the screen has an opposite restoring force and a damping force during the motion, so the motion equation is:

wherein 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, the technical scheme also has the problem of large occupied space, and is not beneficial to the structural design of thinning the mobile phone. On the premise that the mobile phone screen 01 generates large enough amplitude, enough space needs to be reserved between the two magnets, otherwise collision between the magnets and the electromagnet 02 can be caused, and the acoustic performance of screen sounding is seriously affected. Therefore, more space is inevitably occupied in the thickness direction of the mobile phone.

In addition, the magnet is usually a monolithic magnet, and the magnet has low magnetic field density, low magnetic field utilization rate and small driving force of electronic products.

Disclosure of Invention

The invention aims to provide a vibration sound-producing device and a new technical scheme of an electronic product.

According to a first aspect of the present invention, a vibratory sound generating apparatus is provided. The device comprises a shell, a fixing piece and a driving component; at least a portion of the housing is configured to vibrate relative to the mount; the driving assembly comprises at least one coil and a Halbach magnet, the coil is fixedly connected with the fixing piece, the Halbach magnet is fixedly connected with the shell, or the Halbach magnet is fixedly connected with the fixing piece, and the coil is fixedly connected with the shell; the plane of the coil is perpendicular to the part of the shell used for vibration, the coil is positioned on the side of the Halbach magnet, the annular end face of the coil faces the Halbach magnet, and the coil penetrates through the magnetic field enhancement area of the Halbach magnet.

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

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

Optionally, the drive assembly further comprises a protective shell, through which the halbach magnet is fixedly connected with the portion of the housing for vibration.

Optionally, the protective shell includes side edges and an open end surrounded by the side edges, the coil extends into the protective shell from the open end, and a magnetic conductive plate is disposed on one side of two sets of halbach magnets adjacent to the side edges, the side being far away from the gap.

Optionally, a through hole is formed in the middle of the coil, a routing area of the coil is around the through hole, the routing area includes a first routing area close to the portion of the housing for vibration and a second routing area far away from the portion of the housing for vibration, and routing directions of the first routing area and the second routing area are parallel to the surface of the portion of the housing for vibration;

a magnetic field is formed between the permanent magnets of the two adjacent groups of Halbach magnets close to the part of the shell for vibration, and the first routing area penetrates through the magnetic field; a magnetic field is formed between the permanent magnets of the parts, away from the shell, of the two adjacent groups of Halbach magnets for vibration, and the second wiring area penetrates through the magnetic field.

Optionally, the coil fixing device further comprises a lower shell, wherein the coil is fixed on the lower shell, and the lower shell is fixedly connected with the fixing piece.

Optionally, the magnetic suspension permanent magnet is arranged on the lower shell, and the magnetic suspension permanent magnet and the halbach magnet repel each other.

Optionally, a raised structure is formed in the middle of the lower shell, the coil is fixed on the raised structure, the magnetic levitation permanent magnet is arranged on at least one side of the raised structure, and the halbach magnet and the magnetic levitation permanent magnet are arranged oppositely; or

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

Optionally, the protective shell is made of a magnetically permeable material.

Optionally, the portion of the housing for vibrating is a screen or a back cover opposite the screen.

According to another aspect of the present invention, an electronic product is provided. The product comprises: the vibration sounding device; the product main part, the mounting is a part of the structure of product main part, drive assembly sets up in the product main part.

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

According to one embodiment of the present disclosure, the present invention provides a vibration sound generating device capable of directly driving at least a partial vibration of a housing, on the one hand, compared to the prior art.

On the other hand, the shell can be better protected, and the risk of damage to the shell is reduced. The coil and the Halbach magnet are respectively and directly arranged on the fixing piece and the shell, and the shell is directly driven, so that the efficient vibration transmission efficiency is ensured. The direct drive mode of directly connecting the drive assembly with the vibration assembly simplifies the principle of driving the shell to vibrate, and the shell can directly generate vibration after receiving ampere force. The design mode effectively improves the vibration conversion efficiency, and the shell does not need to be driven to vibrate by the vibration of the vibrator to cause resonance. The design enables the amplitude generated by the shell to be basically consistent with the amplitude generated by the driving assembly, and the space reserved for the driving assembly can be designed according to the performance requirement on the amplitude of the shell. There is no need to reserve a vibration space for the drive assembly that is significantly larger than the maximum amplitude of the housing.

On the other hand, the halbach magnet forms a magnetic field enhancement region, and the coil is located in the magnetic field enhancement region. Compare in ordinary magnet, halbach magnet's magnetic field density is high, and magnetic field utilization ratio is high, and drive power is big, and the ampere force that the coil received can be bigger more balanced, and the vibration of vibration subassembly is more steady, and is stronger, and the start oscillation speed is faster.

On the other hand, the vibration sound-generating device adopts a split type design, an elastic sheet does not need to be arranged between the protective shell and the fixing piece, and the flexibility of installation is higher.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Figure 1 is a side cross-sectional view of one prior art screen sound generation solution.

Fig. 2 is an exploded view of the driving assembly of the vibration sound-generating device provided by the present invention.

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

FIG. 4 is a schematic side sectional view of another vibration sound generator of the present invention

Fig. 5 is another angled side sectional view of a vibratory sound generator of the present invention.

Fig. 6 is an axial view of the vibration sound generating device provided with no protective cover according to the present invention.

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

Fig. 8 is a partially enlarged view of fig. 7.

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, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be 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 invention provides a vibration sounding device. The sound generating device comprises a vibration component and a driving component. As shown in fig. 2 and 3, the vibration assembly includes a housing and a fixing member. At least a portion of the housing is configured to vibrate relative to the mount. The housing has a sufficiently large vibration area. For example, the portion of the housing for vibration is the screen 20 or a back cover 22 opposite to the screen 20. The screen 20 will be described as an example. The fixing part can be a certain fixing part in an electronic product applied to the sound generating device, and can also be a separately configured fixed part.

As shown in fig. 8, the drive assembly includes at least one coil 16 and a halbach magnet 10. The coil 16 is wound in one direction from a wire in a closed loop configuration. The coil 16 has a through hole in the middle. Around which is the routing area for the coil 16. The routing area refers to an area through which the lead wire in the coil 16 actually passes, and the whole routing area is annular.

For example, the routing areas include a first routing area 16a close to the part (e.g., the screen 20) of the housing for vibration and a second routing area 16b far away from the part of the housing for vibration, and the routing directions of the first routing area 16a and the second routing area 16b are parallel to the surface of the part of the housing for vibration;

the coil 16 is fixedly connected with the fixing member. For example, the coil 16 is fixedly connected directly to the fixing member, or is fixedly connected indirectly to the fixing member through another member (e.g., a lower case). The halbach magnet 10 is fixedly connected to the housing. For example, the drive assembly further includes a protective housing. The halbach magnet 10 is fixed within the protective case 11. Preferably, the protective shell 11 is made of a magnetically conductive material, such as mild steel, SPCC, or the like. The protective casing 11 made of magnetic conductive material can effectively reduce magnetic flux leakage. The protective shell 11 is fixedly connected with the screen 20. The coil 16 continuously generates heat during energization. If the coil 16 is fixedly connected to the screen 20, the screen 20 is easily damaged by heat. In this example, the coil 16 is fixedly connected to the fixing member instead of the screen 20, so that the screen 20 is effectively prevented from being damaged by heat generated from the coil 16.

Further, since the coil 12 is provided on the fixing member, connection of the coil to an external circuit is facilitated.

In other examples, the halbach magnet is fixedly coupled to the mount and the coil is fixedly coupled to the housing.

The coil 16, in the form of a closed loop, has its own axis, and in the embodiment of the invention, the axis of the coil 16 is parallel to the surface of the screen 20, as shown in fig. 8, and the plane of the coil 16 is perpendicular to the screen. As shown in fig. 3, the protective shell 11 includes side edges and an open end 23 surrounded by the side edges. The coil 16 extends from the open end 23 into the protective casing 11.

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

In one example, as shown in fig. 2-4, the halbach magnets 10 are in at least two groups. For example, there may be 2 groups, 3 groups, 4 groups, etc. Each set of halbach magnets is arranged along the direction of vibration. A gap 24 is formed between the halbach magnets of adjacent sets. One coil 16 is disposed within each gap 24. When the number of the coils 16 is plural, the driving force of the driving assembly is larger. The gap 24 is a magnetic field enhancement region of the halbach magnet 10, the coil 16 is located within the gap 24, and the routing region passes through a magnetic field generated by the halbach magnet 10. In the embodiment shown in fig. 3 and 4, in the form of tracks running in and out of the page. The halbach magnet 10 is capable of generating a magnetic field, at least one of the first and

second trace regions

16a, 16b passing through the magnetic field generated by the halbach magnet 10. Thus, an ampere force can be generated between the coil 16 and the halbach magnet 10 when an alternating current signal is applied to the coil 16. The energized trace region passes through the magnetic field and can generate an ampere force. Because the coil 16 is located within the gap 24 formed by the halbach magnet 10, at least a portion of the magnetic field generated by the halbach magnet 10 is able to pass through the coil 16 in a direction parallel to the surface of the screen 20, thereby generating an ampere force in a direction perpendicular to the surface of the screen 20.

Since the coil 16 and the halbach magnet 10 are respectively arranged on the fixed member and the screen 20, and the current signal introduced into the coil 16 is an alternating signal, the direction of the generated ampere force is alternately changed in the opposite direction. The ampere force can be transmitted directly to the screen 20 through the drive assembly. The protective shell 11 can directly drive the screen 20 after receiving ampere force. The ampere force causes relative displacement between the screen 20 and the mount, thereby vibrating the screen 20 relative to the mount to generate sound.

Compared with the prior art, the vibration sound-generating device provided by the invention can directly drive at least part of the shell (such as the screen 20 or the rear cover 22) to vibrate on one hand.

On the other hand, the housing (e.g., screen 20 or rear cover 22) can be better protected, reducing the risk of damage to the housing. Taking the embodiment shown in fig. 8 as an example, the coil 16 and the halbach magnet 10 are respectively disposed on the fixed member and the housing, and directly drive the housing, thereby ensuring efficient vibration transmission efficiency. The direct drive mode of directly connecting the drive assembly with the vibration assembly simplifies the principle of driving the shell to vibrate, and the shell can directly generate vibration after receiving ampere force. The design mode effectively improves the vibration conversion efficiency, and the shell does not need to be driven to vibrate by the vibration of the vibrator to cause resonance. The design enables the amplitude generated by the shell to be basically consistent with the amplitude generated by the driving assembly, and the space reserved for the driving assembly can be designed according to the performance requirement on the amplitude of the shell. There is no need to reserve a vibration space for the drive assembly that is significantly larger than the maximum amplitude of the housing.

On the other hand, the halbach magnet forms a magnetic field enhancement region, and the coil 16 is located in the magnetic field enhancement region. Compared with a common magnet, the Halbach magnet is high in magnetic field density, high in magnetic field utilization rate and large in driving force, ampere force borne by the coil 16 can be larger and more balanced, vibration of the vibration assembly is more stable and stronger, and the starting vibration speed is higher.

Preferably, as shown in fig. 2, each set of said magnets comprises three permanent magnets, respectively a first permanent magnet 13, a second permanent magnet 14 and a third permanent magnet 15, arranged along the direction of vibration. A gap 24 is formed between the two sets of magnets. The magnetizing directions of the permanent magnets at the two ends are vertical to the vibration direction, and the magnetizing directions are opposite; the magnetizing direction of the permanent magnet positioned in the middle part is parallel to the vibration direction. The vibration direction is the direction in which the vibrating assembly vibrates. The magnetizing directions of the permanent magnets at the two ends of the two adjacent groups of Halbach magnets in the vibration direction are the same, and the magnetizing directions of the permanent magnets in the middle parts are opposite.

For example, as shown in fig. 3 to 4, the first permanent magnet 13a (the end far from the gap 24 is the S pole, and the end near the gap 24 is the N pole) in the left row and the third permanent magnet 15a (the end far from the gap 24 is the N pole, and the end near the gap 24 is the S pole) in the left row have their magnetizing directions perpendicular to the vibration direction, and are opposite to each other. The first permanent magnet 13a (the end far from the gap 24 is the S pole, and the end near the gap 24 is the N pole) in the left row corresponds to the first permanent magnet 13b (the end far from the gap 24 is the N pole, and the end near the gap 24 is the S pole) in the right row, and the magnetizing directions of the two are the same. The second permanent magnet 14a in the left row (the end close to the open end 23 is the S pole, and the end far from the open end 23 is the N pole) corresponds to the second permanent magnet 14b in the right row (the end close to the open end 23 is the N pole, and the end far from the open end 23 is the S pole), and the magnetizing directions of the two are parallel to the vibration direction, and are opposite. The third permanent magnet 15a in the left row (the end far from the gap 24 is the N pole, and the end near the gap 24 is the S pole) corresponds to the third permanent magnet 15b in the right row (the end far from the gap 24 is the S pole, and the end near the gap 24 is the N pole), and the magnetizing directions of the two permanent magnets are perpendicular to the vibration direction, and are the same.

In this example, the magnetic field strength is greatest in the gap 24 formed between two adjacent sets of halbach magnets. The driving force of the vibration component is maximum, and the vibration starting speed is high.

Of course, the number of permanent magnets in each group is not limited to 3, but may be more. The magnetizing directions of the permanent magnets at the two ends of each group of Halbach magnets are vertical to the vibration direction and opposite; the magnetizing direction of the permanent magnets in the middle is parallel to the vibration direction, and the magnetic fields of the permanent magnets are in paramagnetic connection with each other, namely the N poles and the S poles of the adjacent permanent magnets are opposite. In this way, the magnetic field strength within the gap 24 can be greater.

Of course, the halbach magnet is not limited to the above-described embodiments, and may be selected by those skilled in the art according to actual needs.

Preferably, as shown in fig. 5, the main body direction of the halbach magnet 10 is parallel to the long sides of the coil 16. The main direction is the direction in which the longest side of the halbach magnet 10 extends. The long side of the coil 16 is the side of the coil 16 having the longest length. In this arrangement, the effective active area of the halbach magnet 10 and coil 16 is maximized, and the maximum ampere force is developed therebetween.

In other examples, the halbach magnet 10 is not limited to the above-described structure, and may be set by those skilled in the art according to actual needs.

Preferably, as shown in fig. 2-4, the halbach magnets 10 are in at least two groups. And a magnetic conduction plate 12 is arranged on one side, far away from the gap 24, of the two groups of Halbach magnets adjacent to the side edge of the protective shell. Namely, one side of the two groups of Halbach magnets at the outermost side, which is far away from the gap, is provided with a magnetic conduction plate 12. The magnetic conductive plate 12 is a magnetic conductive material, such as low carbon steel, SPCC, or the like. The magnetic conductive plate 12 can gather magnetic induction lines, reduce the occurrence of magnetic leakage, and further improve the magnetic field strength in the gap 24.

Preferably, as shown in fig. 3 to 4, a magnetic field is formed between the permanent magnets (e.g., the first

permanent magnets

13a,13b) of the two adjacent groups of halbach magnets near the screen 20, and the first routing area 16a passes through the magnetic field; the permanent magnets (e.g., the third

permanent magnets

15a,15b) of two adjacent sets of the magnets far from the screen 20 form a magnetic field therebetween, and the second routing area 16b passes through the magnetic field. In this example, the two track areas each pass through a magnetic field at a different location. This results in a significant increase in the driving force of the oscillating assembly.

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

Preferably, under the condition that the lower shell 18 is made of a magnetic conductive material, the magnetic leakage of the magnetic levitation permanent magnet 17 can be reduced. However, the magnetically permeable material and the halbach magnet 10 form a static magnetic field force, and the two attract each other. This results in the screen 20 and the mount being close to each other. To solve this technical problem, the drive assembly further comprises a magnetically levitated permanent magnet 17. The magnetic levitation permanent magnet 17 is disposed on the lower case 18, and the magnetic levitation permanent magnet 17 repels the magnet. The magnetic floating permanent magnet 17 and the halbach magnet 10 form a repulsive force which can balance the static magnetic field force.

In addition, the magnetic levitation permanent magnet 17 can generate centering damping, and transient response is improved.

In addition, the magnetic levitation permanent magnet 17 can play a role in buffering and can buffer the impact force applied to the screen 20, thereby preventing the screen 20 from being damaged by the frequently changed ampere force.

Of course, no matter whether the lower shell is made of a magnetic conductive material or not, the magnetic levitation permanent magnet 17 and the Halbach magnet form repulsion, the magnetic levitation permanent magnet 17 can generate centering damping, the Halbach magnet is prevented from vibrating and deviating, and transient response is improved. After the power is cut off, the Halbach magnet can stop vibrating rapidly under the repulsion action of the magnetic floating permanent magnet 17.

On the other hand, the magnetic floating permanent magnet 17 plays a role of buffering the impact force to which the screen 20 is subjected, thereby preventing the screen 20 from being damaged by the frequently changed ampere force.

Preferably, a convex structure 19 is formed at the center of the lower case 18. The protrusion structure 19 is a stripe protrusion or a dot protrusion. The coil 16 is fixed to the raised structure 19. The coil 16 is fixed to the boss structure 19 by an adhesive, for example. The magnetic levitation permanent magnet 17 is located on at least one side of the protruding structure 19, and in this embodiment, the magnetic levitation permanent magnet 17 includes two sets of magnets, and the two sets of magnets are respectively fixed on two sides of the protruding structure 19. For example, each set of magnets may include only one magnet or a plurality of magnets. The halbach magnets 10 are provided in two groups, and are disposed to be opposed to the two groups of magnets, respectively. In this example, the magnetizing direction of the magnetically levitated permanent magnet 17 is perpendicular to the vibration direction and is the same as that of the permanent magnet near the lower case 18 to form a repulsive force. For example, as shown in fig. 4, the third permanent magnet 15a positioned in the left row has the same direction of magnetization as the magnetic levitation permanent magnet 17 positioned on the left side, thereby forming a repulsive force. The third permanent magnet 15b positioned in the right row has the same magnetizing direction as the magnetic levitation permanent magnet 17 positioned on the right side, thereby forming a repulsive force. The raised structures 19 allow for more accurate positioning of the coil 16 and the magnetically levitated permanent magnet 17. The integral volume of the magnetic suspension permanent magnet 17 arranged in a split manner is smaller, and the interference to the magnetic field in the gap 24 is smaller.

Alternatively, as shown in fig. 3, the lower case 18 may have a sheet-like structure. The magnetic levitation permanent magnet 17 is of an integral structure. For example, the magnetic levitation permanent magnet 17 is an integral sheet structure, and the magnetizing direction of the magnetic levitation permanent magnet is perpendicular to the vibration direction. The magnetically levitated permanent magnet 17 is disposed on the lower case 18. The magnetically levitated permanent magnet 17 is fixed to the lower case 18 by means of, for example, bonding, snapping, or the like. The coil 16 is arranged on the magnetically levitated permanent magnet 17. For example, the coil 16 is bonded to the magnetically levitated permanent magnet 17 by an adhesive. The magnetic floating permanent magnet 17 has the strongest magnetism at two ends perpendicular to the vibration direction, and the magnetism at the two ends is the same as that of the corresponding halbach magnet 10 close to the corresponding end, so as to form repulsion. For example, as shown in fig. 4, the end of the third permanent magnet 15a on the left side far from the gap 24 is an N-pole, and the left end of the magnetic levitation permanent magnet 17 is an N-pole, so as to form a repulsive force. The end of the third permanent magnet 15b on the right side far from the gap 24 is an S pole, and the right end of the magnetic levitation permanent magnet 17 is an S pole, so that a repulsive force is formed. The magnetic levitation permanent magnet 17 of an integrated structure is easier to install.

Of course, the arrangement of the magnetic levitation permanent magnet 17 is not limited to the above-mentioned embodiments, and those skilled in the art can arrange the magnetic levitation permanent magnet according to actual needs.

The invention also provides an electronic product. The electronic product may be, but is not limited to, a mobile phone, a notebook computer, an electronic watch, a tablet computer, an interphone, etc.

As shown in fig. 7-8, the electronic product includes the vibration sound-generating device provided by the present invention and a product main body. The screen 20 is provided on the product main body and serves as a display screen of an electronic product. The screen 20 may be provided in a form that one end is rotatably connected to the product body and the other end is freely movable; alternatively, the screen 20 may be made of a material having a good elastic deformation ability, and the screen 20 may be fixedly connected to other fixed members at one end and freely movably disposed at the other end. In this way, the screen 20 is able to vibrate with respect to the body of the product. A portion of the product body may be configured as the fastener, and the driving assembly may be disposed within the product body. For example, the protective case 11 and the halbach magnet 10 are fixedly provided on the screen 20, and the coil 16 is fixedly provided on a part of the product body corresponding to the fixing member. The screen 20 can be driven to vibrate and sound by the ampere force generated by the driving component. Because the electronic product provided by the invention adopts the vibration sound production device provided by the invention, the occupied space of the electronic product in the thickness direction parallel to the screen 20 is less, the electronic product is more favorably designed to be thinner, and the design requirement of lightening and thinning the electronic product is met.

Preferably, the fixing member may be a structure of a middle frame 21, a PCB, a sidewall, etc. in the product main body. In the product main body, in order to mount other electronic devices, the product main body is often provided with a partition, a middle frame 21, and the like. A rear 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 for use in electronic devices, and on the other hand for protecting electronic devices. Therefore, the structure member in the product body is used as the fixing member, so that the conversion rate of converting ampere force into vibration can be improved, and the vibration reliability can be improved. The inner surface of the side wall of the product body may also serve as the fixing member.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A vibration sound production device is characterized by comprising a shell, a fixing piece, a driving component, a lower shell and a magnetic levitation permanent magnet;

at least a portion of the housing is configured to vibrate relative to the mount;

the driving assembly comprises at least one coil and a Halbach magnet, the coil is fixedly connected with the fixing piece, the Halbach magnet is fixedly connected with the shell, or the Halbach magnet is fixedly connected with the fixing piece, and the coil is fixedly connected with the shell;

the plane of the coil is perpendicular to the part of the shell used for vibration, the coil is positioned on the side of the Halbach magnet, the annular end face of the coil faces the Halbach magnet, and the coil penetrates through the magnetic field enhancement area of the Halbach magnet;

the lower shell is fixed on the fixing piece, the magnetic levitation permanent magnet is arranged on the lower shell, and the magnetic levitation permanent magnet and the Halbach magnet repel each other.

2. A vibratory sound generating device as claimed in claim 1 wherein said halbach magnets are in at least two groups, adjacent two groups of halbach magnets defining a gap therebetween, said coil being located within said gap.

3. The vibration sound production device according to claim 2, wherein each group of halbach magnets includes three permanent magnets arranged along the vibration direction, the magnetization directions of the permanent magnets at the two ends are perpendicular to the vibration direction and opposite to each other, and the magnetization direction of the permanent magnet at the middle part is parallel to the vibration direction; the magnetizing directions of the permanent magnets at the two ends of the two adjacent groups of Halbach magnets in the vibration direction are the same, and the magnetizing directions of the permanent magnets in the middle parts are opposite.

4. A vibratory sound generating device as claimed in claim 2 wherein said drive assembly further comprises a protective housing through which said halbach magnet is fixedly connected to said portion of said housing for vibration.

5. A vibration sound-emitting device according to claim 4, wherein said protective case includes side edges and an open end surrounded by said side edges, said coil extends into said protective case from said open end, and a magnetic conductive plate is provided on a side of two groups of said Halbach magnets adjacent to said side edges, said side being away from said gap.

6. The vibration sound production device according to claim 3, wherein the coil has a through hole in the middle, and a routing area of the coil is around the through hole, the routing area includes a first routing area close to the portion of the housing for vibration and a second routing area far from the portion of the housing for vibration, and routing directions of the first routing area and the second routing area are parallel to the surface of the portion of the housing for vibration;

7. A vibration sound-producing device according to claim 1, wherein said coil is fixed to said lower case.

8. The vibration sound production device according to claim 1, wherein a raised structure is formed in the middle of the lower case, the coil is fixed on the raised structure, the magnetic levitation permanent magnet is arranged on at least one side of the raised structure, and the halbach magnet is arranged opposite to the magnetic levitation permanent magnet; or

9. A vibratory sound generating device as claimed in claim 4 wherein said protective casing is of magnetically permeable material.

10. A vibration sound-emitting device according to claim 1, wherein the portion of the casing for vibration is a screen or a back cover opposed to the screen.

11. An electronic product, comprising:

a vibrating sound generating device as claimed in any one of claims 1 to 10;

the product main part, the mounting is a part of the structure of product main part, drive assembly sets up in the product main part.

12. The electronic product of claim 11, wherein the fixing member is a middle frame, a PCB or a side wall of the product body.