CN209787432U

CN209787432U - Vibration sound production device and electronic product

Info

Publication number: CN209787432U
Application number: CN201920958507.6U
Authority: CN
Inventors: 毛东升; 史德璋; 朱跃光; 马咪
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2019-12-13
Anticipated expiration: 2029-06-24

Abstract

The utility model discloses a vibration sound generating mechanism and electronic product. The vibration sound production device comprises a vibration assembly and a sound production device, wherein the vibration assembly comprises a shell and a fixing piece, the fixing piece is arranged in the shell, the shell comprises a screen and a rear cover, the screen and/or the rear cover are used as vibration parts, and the vibration parts are configured to vibrate relative to the fixing piece; the magnetic circuit comprises a shell, a driving assembly and a fixing piece, wherein the shell is provided with a main magnetic circuit part, the driving assembly comprises at least one coil and at least one Halbach magnet, the coil is provided with a hollow area, the periphery of the hollow area is a wiring area of the coil, one of the coil and the Halbach magnet is fixedly connected with the shell, the other of the coil and the Halbach magnet is fixedly connected with the fixing piece, the Halbach magnet comprises a main magnetic circuit part positioned in the center and an annular side magnetic circuit part arranged around the main magnetic circuit part, the Halbach magnet is configured to form a magnetic field enhancement area on one side close to the coil, and the. The utility model discloses a technological effect is for improving the vibration sound production effect.

Description

Vibration sound production device and electronic product

Technical Field

The utility model relates to an electroacoustic conversion technology field, more specifically, the utility model relates to a vibration sound generating mechanism and 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. Nowadays, with the rapid development of electronic products, sound generating devices applied to various electronic products have been improved accordingly.

In recent years, screen sounding technology is increasingly widely applied to electronic products. Electromagnetic actuators of screen sound generators are generally classified into resonant type electromagnetic actuators and direct drive type electromagnetic actuators. Wherein, the direct-drive electromagnetic exciter can directly drive the screen to vibrate. Compared with a resonant type electromagnetic exciter, the vibration mode can reduce energy loss in the vibration process, and therefore the application range is wider.

Fig. 1 shows a direct-drive electromagnetic actuator in the prior art, which adopts a structural distribution manner that an electromagnet 02 and a magnet 03 are oppositely disposed, and by turning on and off the electromagnet 02 or switching the magnetic poles of the electromagnet 02, a variable adsorption and repulsion action is 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 the above solution, assuming that the vertical displacement is x, the two magnets are attracted, and there is a force f (x) between the first magnet and the second magnet related to the displacement. The restoring force of the self-rigidity of the screen is F (kmsx), and at the moment, a state of force balance existsAfter the coil of the electromagnet 02 is energized, the magnetic field between the two magnets is disturbed, and the forces between the electromagnet 02 and the magnet 03 are thus unbalanced, for example, due to the cocurrent magnetic field of current-enhanced attractionTherefore, the two magnets tend to approach each other, while the screen has an inverse restoring force and a damping force during the movement, so that the equation of motion is:

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

the magnet is generally a monolithic magnet, and the magnet has low magnetic field density, low magnetic field utilization rate and small driving force on the electronic terminal. That is to say, the existing direct-drive electromagnetic exciter has the problems of low magnetic utilization rate and poor effect when being applied to the screen sounding technology.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a vibration sound generating mechanism's new technical scheme.

According to an aspect of the utility model, a vibration sound-producing device is provided, include:

A vibration assembly including a housing and a fixing member, the fixing member being disposed within the housing, the housing including a screen and a rear cover, the screen and/or the rear cover serving as a vibration portion configured to be vibratable relative to the fixing member;

A driving assembly including at least one coil and at least one halbach magnet, the coil having a hollow region, the hollow region being surrounded by a routing region of the coil, one of the coil and the halbach magnet being fixedly connected to the housing, the other of the coil and the halbach magnet being fixedly connected to the fixing member, the halbach magnet including a main magnetic circuit portion at a center and an annular side magnetic circuit portion disposed around the main magnetic circuit portion, the halbach magnet being configured to form a magnetic field enhancing region at a side close to the coil, the coil passing through the magnetic field enhancing region;

the coil is in a parallel posture relative to the vibration part, the coil is configured to be capable of being fed with an alternating current signal, the electrified wiring area penetrates through the magnetic field enhancement area, and an ampere force in a direction perpendicular to the main body direction of the vibration part is generated between the coil and the Halbach magnet;

Alternating current signals led into the coil enable the direction of the ampere force to change in an alternating and reverse mode, and the vibration assembly is subjected to the alternating ampere force transmitted by the driving assembly so that the vibration portion vibrates and produces sound relative to the fixing piece.

Optionally, the magnetizing direction of the annular side magnetic circuit part is parallel to the plane of the coil, and the magnetizing direction points radially to the center of the main magnetic circuit part; the magnetizing direction of the main magnetic circuit part is perpendicular to the plane of the coil.

Optionally, the main magnetic circuit portion and the annular side magnetic circuit portion are independent from each other;

The annular side magnetic circuit part is a magnetic ring magnetized in the radial direction; in the alternative, the first and second sets of the first,

The annular side magnetic circuit part is formed by splicing a plurality of radially magnetized magnetic blocks.

Optionally, the magnetizing direction of the annular side magnetic circuit part is parallel to the plane of the coil, and the magnetizing direction is parallel to the main magnetic circuit part; the magnetizing direction of the main magnetic circuit part is perpendicular to the plane of the coil.

The annular side magnetic circuit part is formed by splicing at least two unidirectional magnetized magnetic blocks, and the magnetizing direction of each magnetic block is parallel to the symmetry axis of the magnetic block and points to the main magnetic circuit part.

Optionally, a central balance magnet is disposed within the hollow region of the coil, the central balance magnet being configured to direct magnetic lines of force emitted by the halbach magnet through the coil.

Optionally, the vibration sound generating device further includes a first housing, the first housing is a dish-shaped structure with one open end, the halbach magnet is located in the first housing, and the magnetic field enhancement region is located on the open side of the first housing.

Optionally, the vibration sound generating device further includes a second housing, the second housing is a dish-shaped structure with one open end, the coil is located in the second housing, and the open end of the first housing is opposite to the open end of the second housing.

Optionally, the first housing and/or the second housing are made of a magnetically conductive material.

Optionally, a hollow structure is formed at a portion of the second housing corresponding to the hollow region of the coil.

According to another aspect of the present disclosure, an electronic product is provided. The electronic product includes:

The vibration sounding device; and

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 of the product body.

According to the utility model discloses an embodiment, halbach magnet adopts the main magnetic circuit part that is located the center and the cyclic annular limit magnetic circuit part that sets up around main magnetic circuit part, through magnetizing under this structure, main magnetic circuit part can form magnetic field reinforcing area in the one side of being close to the coil, and the magnetic field in the region outside magnetic field reinforcing area is relatively more weak to can improve vibration sound generating mechanism's drive power effectively, thereby effectively promote the effect of screen sound production.

Furthermore, the halbach magnet of the utility model is simple in structure, and the magnetic induction intensity is higher.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, 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.

fig. 1 is a schematic structural diagram of a direct-drive actuator in the prior art.

fig. 2 is an exploded view of a driving assembly according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a first halbach magnet according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of the drive assembly provided in fig. 2.

Fig. 5 is an external structural view of a driving assembly according to an embodiment of the present invention.

Fig. 6 is a schematic view of a magnetizing principle of a halbach magnet according to an embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a second halbach magnet according to an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a third halbach magnet provided in an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a fourth halbach magnet provided in an embodiment of the present invention.

Fig. 10 is a schematic structural diagram of a fifth halbach magnet according to an embodiment of the present invention.

Fig. 11 is a schematic structural diagram of a sixth halbach magnet according to an embodiment of the present invention.

Fig. 12 is a schematic structural diagram of a seventh halbach magnet according to an embodiment of the present invention.

Fig. 13 is a cross-sectional view of another drive assembly provided by an embodiment of the present invention.

Fig. 14 is an exploded view of a magnetic circuit assembly according to an embodiment of the present invention.

Fig. 15 is a schematic structural diagram of a coil assembly according to an embodiment of the present invention.

fig. 16 is a schematic structural diagram of a second housing according to an embodiment of the present invention.

fig. 17 is a cross-sectional view of another drive assembly provided by an embodiment of the present invention.

Fig. 18 is a partial schematic view of an electronic product according to an embodiment of the present invention.

Description of reference numerals:

11-first shell, 12-second shell, 13-annular side magnetic circuit part, 14-main magnetic circuit part, 15-coil, 150-hollow area, 16-hollow structure, 17-central balance magnet, 18-screen, 19-middle frame, 20-magnetic gap, 110-magnetic circuit component, 120-coil component and 130-Halbach magnet.

Detailed Description

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

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.

according to an embodiment of the present invention, a vibration sound production device is provided. The vibration sound production device comprises a vibration assembly and a driving assembly.

Wherein, the vibration subassembly includes shell and mounting. The fixture is disposed within the housing. The housing includes a screen 18 and a rear cover. The screen 18 is disposed opposite the rear cover. The screen 18 and/or the rear cover serve as a vibrating portion. The vibration part is a part of the shell for vibration and sound production. The vibrating portion is configured to be capable of vibrating relative to the mount. The screen 18 will be described as an example. The fixing element may be a fixing component in an electronic product to which the sound generating device is applied, or may be a separately configured fixed part, which is not limited to this.

Referring to fig. 2, the drive assembly includes at least one coil 15 and at least one halbach magnet 130. For example, the coil 15 may be wound from a wire in one direction in a closed loop configuration. The coil 15 has a hollow area 150, and the periphery of the hollow area 150 is a routing area of the coil 15. It should be noted that, in the utility model, the shape of the coil 15 can be ring shape, rectangle, runway shape, etc., and can be flexibly adjusted according to specific needs, and is not limited to this.

In the present invention, one of the coil 15 and the halbach magnet 130 is fixedly connected to the vibrating portion, and the other is fixedly connected to the fixing member. For example, the coil 15 is attached to the mount and the halbach magnet 130 is attached to the screen 18. The coil 15 generates heat during operation, and since the coil 15 is not fixedly connected to the screen 18, the screen 18 is not damaged. The halbach magnet 130 may include multiple portions of different magnetization directions. The magnetizing direction is the direction indicated by the arrow in fig. 6, wherein the polarity of the end indicated by the arrow is N-pole. The magnetic field of the predetermined area can be strengthened by setting the magnetizing directions of the parts, namely, the magnetic field strengthening area is formed.

in the present invention, the halbach magnet 130 is configured to form a magnetic field enhancement region at a side near the coil 15, and the magnetic field intensity is significantly reduced at other regions of the halbach magnet 130. The coil 15 passes through the field enhancement region and the halbach magnet 130 vibrates relative to the coil 15 in a direction perpendicular to the plane of the coil 15. The halbach magnet 130 lies in a plane parallel to the annular end face of the coil 15. The coil 15 is in a parallel posture with respect to the vibrating portion (e.g., the screen 18), i.e., they are arranged in parallel with each other. The annular end face of the coil 15 faces the halbach magnet 130. The coil 15 is configured to: an alternating current signal can be applied. The powered trace region passes through the magnetic field enhancement region. An ampere force in a direction perpendicular to the main body direction of the vibrating portion is generated between the coil 15 and the halbach magnet 130. For example, the main body direction of the vibrating portion is the extending direction of the screen 18 or the rear cover.

The alternating current signal led into the coil 15 makes the direction of the ampere force change in an alternating and reverse way, and the vibration component receives the alternating ampere force transmitted by the driving component so that the vibration part vibrates and produces sound relative to the fixing component.

The utility model discloses in one side that halbach magnet 130 is close to coil 15 forms magnetic field enhancement region, and the magnetic field in the region outside magnetic field enhancement region is relatively more weak to can improve vibration sound generating mechanism's drive power effectively, and then can promote the effect of screen sound production effectively.

Referring to fig. 2 and 3, the halbach magnet 130 of the present invention includes a main magnetic path portion 14 and a ring-shaped side magnetic path portion 13. The main magnetic path portion 14 is located at a central position, and the annular side magnetic path portion 13 is provided around the main magnetic path portion 14. The halbach magnet 130 of the present invention has the characteristics of simple structure and high magnetic induction strength.

Referring to fig. 2 to 4, the halbach magnet 130 includes a main magnetic circuit portion 14 and a loop-shaped side magnetic circuit portion 13, and the main magnetic circuit portion 14 and the loop-shaped side magnetic circuit portion 13 are located at the same layer. The main magnetic path portion 14 is fixedly disposed in the inner ring of the annular side magnetic path portion 13. The main magnetic path portion 14 is fixedly bonded in the inner ring of the annular side magnetic path portion 13 by, for example, an adhesive. Referring to fig. 4 and 5, the coil 15 is disposed parallel to and opposite to the halbach magnet 130, and a magnetic gap 20 is formed between the coil 15 and the halbach magnet 130.

Referring to fig. 6, the halbach magnet 130 of the present invention has a ring-shaped side magnetic circuit portion 13 that can be magnetized toward the main magnetic circuit portion 14. The magnetizing direction can be from outside to inside. The utility model discloses well definition: the region located outside the annular side magnetic path portion 13 is the outside, and the portion located in the inner ring of the annular side magnetic path portion 13 is the inside.

Referring to fig. 6-9, the magnetizing direction of the circular side magnetic path portion 13 is parallel to the plane of the coil 15, and the magnetizing direction is radially directed to the center of the main magnetic path portion 14. The magnetizing method can effectively magnetize the main magnetic circuit part 14, and the magnetizing effect is good. The main magnetic circuit portion 14 is magnetized in a direction perpendicular to the plane of the coil 15. The magnetic lines of force of the annular side magnetic circuit part 13 are connected with the main magnetic circuit part 14. Alternatively, the magnetic lines of force of the main magnetic path portion 14 are engaged with the annular side magnetic path portion 13. The person skilled in the art can set the position of the magnetic field enhancement region according to the actual need.

The main magnetic path portion 14 and the annular side magnetic path portion 13 are independent from each other. For example, the annular side magnetic path portion 13 is a side magnet of an annular structure, and the main magnetic path portion 14 is a main magnet, which may be fixedly disposed in an inner ring of the side magnet.

the annular side magnetic circuit part 13 can be a radially magnetized magnetic ring, i.e. an integral annular structure. For example, the shape may be circular, rectangular, or elliptical, but the present invention is not limited thereto. The main magnetic path portion 14 is disposed in the inner ring of the annular side magnetic path portion 13. In this example, the magnetizing direction of the annular side magnetic path portion 13 is directed radially toward the center of the main magnetic path portion 14. This structure enables the formation of a magnetic field enhancement region on the side close to the coil 15.

In addition, the annular side magnetic circuit portion 13 may not be an integral structure, as shown in fig. 7-9, but may be formed by splicing a plurality of radially magnetized magnetic blocks. The plurality of radially magnetized magnetic blocks are independent of each other and can be combined together by means of bonding, for example. In this example, the annular side magnetic circuit portion 13 of the halbach magnet 130 is an annular magnet array formed by arranging a plurality of magnetic blocks having a radial magnetizing direction. This arrangement makes it easy to manufacture the halbach magnet 130, and the main magnetic path portion 14 can be magnetized well, and the magnetizing effect is excellent.

In one example, referring to fig. 6, the magnetizing direction of the annular side magnetic path portion 13 is directed toward the main magnetic path portion 14. While the main magnetic circuit portion 14 is magnetized with its direction directed axially toward the coil 15. In this example, the field enhanced region is located below the main magnetic path portion 14.

Referring to fig. 13, specifically, the magnetic lines of force of the halbach magnet 130 are emitted from the main magnetic path portion 14 and directed to the coil 15. And returns to the respective ring-shaped side magnet portions 13 after passing through the edges of the coil 15, thereby forming a closed magnetic circuit. The magnetic lines of force are in a horizontal direction or a nearly horizontal direction when passing through the coil 15.

In one example, the magnetizing direction of the annular side magnetic path portion 13 may also be away from the main magnetic path portion 14. At this time, the main magnetic path portion 14 is magnetized in a direction away from the coil 15. In this example, the magnetic field enhancement region is also formed on one side of the main magnetic path portion 14. The coil 15 can also pass through the field enhancement region.

Specifically, the magnetic lines of force of the halbach magnet 130 are emitted from the annular side magnetic circuit portions 13, respectively directed inward toward the edges of the coil 15. And returns to the main magnetic path portion 14 after passing through the edge of the coil 15, thereby forming a closed magnetic path. The magnetic lines of force are in a horizontal direction or a nearly horizontal direction when passing through the coil 15.

Both of the above-described structures can form a magnetic field enhancement region below the main magnetic path portion 14.

in one example, the annular side magnetic path portion 13 may include an odd number of magnetic blocks or an even number of magnetic blocks, and the plurality of magnetic blocks are arranged around the main magnetic path portion 14. Those skilled in the art can set the number of the magnetic blocks constituting the annular side magnetic circuit portion 13 according to actual needs.

For example, the annular rim magnetic circuit portion 13 may include two magnetic blocks. Referring to fig. 7, both the magnetic blocks are semicircular magnets. The main magnetic path portion 14 is a circular sheet magnet. The coil 15 has a circular cross section opposite to the main magnetic path portion 14.

It is also possible that the annular rim magnetic circuit portion 13 includes three magnetic blocks. Referring to fig. 8, the three magnetic blocks are all 120 ° arc magnets. The main magnetic path portion 14 is a circular sheet magnet. The coil 15 has a circular cross section opposite to the main magnetic path portion 14.

It is also possible that the annular rim magnetic circuit portion 13 includes eight magnetic blocks. Referring to fig. 9, eight magnetic blocks are all 45 ° circular arc magnets. The main magnetic path portion 14 is a circular sheet magnet. The coil 15 has a circular cross section opposite to the main magnetic path portion 14.

when the annular side magnetic circuit portion 13 is formed by a plurality of radially magnetized magnetic blocks, the difficulty of magnetization can be appropriately reduced, and the halbach magnet 130 can be easily manufactured. Also, the magnetic induction intensity of the magnetic field enhanced region formed by the halbach magnet 130 is greater, thereby making the driving force of the vibration sound production apparatus greater.

In the halbach magnet 130 of the present invention, the direction of the magnetic field from the annular side magnetic circuit portion 13 to the main magnetic circuit portion 14 can be a unidirectional magnetic field from the outside to the inside.

Referring to fig. 10-12, the magnetizing direction of the annular side magnetic circuit portion 13 is parallel to the plane of the coil 15, and the magnetizing direction is parallel to the main magnetic circuit portion 14. The main magnetic circuit portion 14 is magnetized in a direction perpendicular to the plane of the coil 15. The magnetic lines of force of the annular side magnetic circuit part 13 are connected with the main magnetic circuit part 14. Alternatively, the magnetic lines of force of the main magnetic circuit portion 14 are partially connected to the annular side magnetic circuit 13. The person skilled in the art can set the position of the magnetic field enhancement region according to the actual need.

The annular side magnetic circuit part 13 adopts a unidirectional magnetizing mode. The main magnetic path portion 14 is disposed in the inner ring of the annular side magnetic path portion 13. In this example, the direction of magnetization of the annular side magnetic path portion 13 is directed toward the main magnetic path portion 14. This structure also enables the formation of a magnetic field enhancement region on the side close to the coil 15.

The annular side magnetic circuit part 13 is formed by splicing at least two unidirectional magnetized magnetic blocks. The plurality of unidirectional magnetized magnetic blocks are mutually independent. The magnetic blocks can be bonded together by means of adhesion, for example. In this example, the annular side magnetic circuit portion 13 of the halbach magnet 130 is an annular magnet array formed by arranging a plurality of magnetic blocks having a unidirectional magnetization direction. It should be noted that, at this time, the magnetizing direction of each magnetic block is parallel to the symmetry axis of the magnetic block and points to the main magnetic circuit portion 14. This arrangement facilitates the manufacture of the halbach magnet 130.

In one example, referring to fig. 6, the magnetizing direction of the annular side magnetic path portion 13 is directed toward the main magnetic path portion 14. The main magnetic path portion 14 is magnetized in a direction axially directed toward the coil 15. In this example, the field enhanced region is located below the main magnetic path portion 14.

Specifically, referring to fig. 13, the magnetic lines of force of the halbach magnet 130 are emitted from the main magnetic path portion 14 and directed to the coil 15. And returns to the respective ring-shaped side magnet portions 13 after passing through the edges of the coil 15, thereby forming a closed magnetic circuit. The magnetic lines of force are in a horizontal direction or a nearly horizontal direction when passing through the coil 15.

in one example, the magnetizing direction of the annular side magnetic path portion 13 may also be away from the main magnetic path portion 14. The main magnetic circuit portion 14 is magnetized in a direction away from the coil 15. In this example, the magnetic field enhancement region is also formed on one side of the main magnetic path portion 14. The coil 15 can pass through the field enhancement region.

Specifically, the magnetic lines of force of the halbach magnet 130 are emitted from the annular side magnetic circuit portions 13, respectively directed inward toward the edges of the coil 15. And returns to the main magnetic path portion 14 after passing through the coil 15, thereby forming a closed magnetic path. The magnetic lines of force are in a horizontal direction or a nearly horizontal direction when passing through the coil 15.

For example, the annular rim magnetic circuit portion 13 includes three magnetic blocks. Referring to fig. 10, the three magnetic blocks are all 120 ° arc magnets. The main magnetic path portion 14 is a circular sheet magnet. The coil 15 has a circular cross section opposite to the main magnetic path portion 14. When the annular side magnetic path part 13 magnetizes the main magnetic path part 14, each 120-degree circular arc magnet points to the main magnetic path part 14 to magnetize respectively, but the magnetizing direction of each 120-degree circular arc magnet is parallel to the symmetry axis of the magnet and does not point to the center of the main magnetic path part 14 in a radial shape.

referring to fig. 11 and 12, the annular side magnetic circuit portion 13 may be formed by splicing four magnetic blocks, eight magnetic blocks, or more magnetic blocks.

It should be noted that, in the utility model, compared with the radial magnetization, the unidirectional magnetization has the characteristics of low magnetization difficulty and low cost. However, unidirectional charging is not as good as radial charging in terms of charging effect. When unidirectional magnetization is adopted, in order to improve the unidirectional magnetization effect, the annular side magnetic path portion 13 may be formed of a plurality of magnetic blocks so as to be magnetized toward the main magnetic path portion 14 as much as possible.

In one example, referring to fig. 13, a central balance magnet 17 is disposed within the hollow region 150 of the coil 15. The central balance magnet 17 may be a bar magnet, a cylindrical magnet, or a magnet with other shapes, as long as it is matched with the shape of the hollow area 150 in the coil 15, which is not limited by the present invention. In this example, the central balance magnet 17 is configured to direct magnetic lines of force emanating from the halbach magnet 130 through the coil 15. Since the center balance magnet 17 repels the main magnet 14, the magnetic flux reaching the bottom wall of the second housing 12 can be reduced, thereby enabling more magnetic flux to pass through the coil 15. Thus, the magnetic lines of force are more concentrated and the coil 15 is more strongly magnetically induced.

In one example, referring to fig. 14, the vibration sound generating device of the present invention further includes a first housing 11. The first housing 11 has a dish-like structure with one end open. The dish-like structure surrounds and forms a cavity. The halbach magnet 130 is located within the first housing 11. The main magnetic path portion 14 is near the open end. The magnetic field enhancement region is located at the open side of the first housing 11. The open side is the open end side of the dish. The halbach magnet 130 is fixed within the first housing 11 by, for example, an adhesive. The first housing 11 forms the halbach magnet 130 as a unitary structure. When assembling, the operator directly fixes the bottom wall of the first housing 11 to the outer shell or the fixing member. This makes the assembly of the halbach magnet 130 easy.

in one example, as shown with reference to fig. 15 and 16, the halbach magnet 130 further includes a second housing 12. Similar to the first housing 11. The second housing 12 has a dish-like structure with one end open. The dish-like structure surrounds and forms a cavity. The coil 15 is located within the second housing 12. For example, the end face of the coil 15 is bonded in the second housing 12 by an adhesive. One end face of the coil 15 is opposed to the halbach magnet 130. The open end of the first housing 11 is opposite to the open end of the second housing 12. When assembling, the operator directly fixes the bottom wall of the second housing 12 to the outer shell or the fixing member. This makes assembly of the coil 15 easy.

For example, an FPCB is also provided in the second housing 12. The FPCB is connected to the coil 15. The external line supplies power to the coil 15 through the FPCB.

In this example, as shown with reference to fig. 14 and 15, by providing the first case 11 and the second case 12, the driving assembly of the vibration sound generating device is formed as two separate parts, i.e., the magnetic circuit assembly 110 and the coil assembly 120. The magnetic circuit assembly includes the first housing 11 and the halbach magnet 130. The coil assembly 120 includes the second housing 12 and the coil 15. The open ends of the two portions are opposite. Thus, the driving assembly has simple structure and easy installation.

In one example, the first housing 11 and the second housing 12 are magnetically permeable materials. For example, the magnetically permeable material includes SPCC, low carbon steel, and the like. The magnetic conduction material can effectively reduce the magnetic flux leakage phenomenon, so that more magnetic lines can pass through the coil 15, and the driving force of the vibration sound-generating device is obviously improved.

For example, the first housing 11 and the second housing 12 are both circular in cross section, and the two open ends are the same or equivalent in size. The magnetic flux can reach the side wall of the first housing 11 via the side wall of the second housing 12. Without passing through the first housing 11 and the second housing 12. The arrangement mode can effectively reduce the magnetic leakage phenomenon.

In one example, referring to fig. 16 and 17, a hollow structure 16 is formed at a portion of the second case 12 corresponding to the hollow region of the coil 15. The hollowed-out structure 16 prevents the magnetic flux from passing from this location and directly reaching the side walls via the bottom wall of the second housing 12, thereby enabling more magnetic flux to pass through the coil 15. The hollow structure 16 effectively improves the utilization rate of the magnetic field and improves the driving force of the vibration sounding device.

The hollow structure 16 may be circular, oval, rectangular, etc. and is adapted to the cross-sectional shape of the coil 15, which is not limited thereto.

According to another embodiment of the present invention, an electronic product is provided. 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.

Referring to fig. 18, the electronic product includes the vibration sound generating device and the product main body provided by the present invention. The screen 18 is provided on the product body and serves as a display screen of an electronic product. The screen 18 may be provided in such a manner that one end is rotatably attached to the product body and the other end is freely movable; alternatively, the screen 18 may be made of a material having a good elastic deformability, and the screen 18 may be fixedly connected to other fixed members at one end and be freely movably disposed at the other end. In this way, the screen 18 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 first housing 11 and the halbach magnet 130 are fixedly provided on the screen 18, and the coil 15 and the second housing 12 are fixedly provided on a part of the product main body corresponding to the fixing member. The screen 18 can be driven to vibrate and sound by the ampere force generated by the driving component.

The utility model provides an electronic product, because of having adopted the utility model provides a vibration sound generating mechanism, consequently the space that occupies on the thickness direction that is on a parallel with screen 18 of electronic product still less, more is favorable to being thinner with the electronic product design, satisfies the frivolous design demand of electronic product.

in one example, the fixture may be a bezel 19, PCB, sidewall, etc. structure within the product 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 19, and the like. A rear cover is provided on the side of the middle frame 19 opposite the screen 18. These structural components have good structural stability in electronic products, on the one hand for mounting 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 illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the 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 generating apparatus, comprising:

2. A vibration sound-generating device as claimed in claim 1, wherein the magnetizing direction of the circular side magnetic path portion is parallel to the plane of the coil, and the magnetizing direction is directed radially toward the center of the main magnetic path portion;

The magnetizing direction of the main magnetic circuit part is perpendicular to the plane of the coil.

3. A vibration sound-emitting device according to claim 2, wherein said main magnetic circuit portion and said annular side magnetic circuit portion are independent from each other;

4. A vibration sound-emitting device according to claim 1, wherein the magnetizing direction of the annular side magnetic circuit portion is parallel to the plane of the coil, and the magnetizing direction is parallel to and directed toward the main magnetic circuit portion;

5. A vibration sound-emitting device according to claim 4, wherein said main magnetic circuit portion and said annular side magnetic circuit portion are independent from each other;

6. A vibration sound-emitting device according to claim 1, wherein a central balance magnet is provided in the hollow region of the coil, the central balance magnet being configured to guide magnetic lines of force emitted by the halbach magnet through the coil.

7. A vibratory sound generating device as recited in claim 1 further comprising a first housing in the form of a dish open at one end, said halbach magnet being located within said first housing, said magnetic field enhancement region being located on an open side of said first housing.

8. a vibration sound-emitting device according to claim 7, further comprising a second casing in the form of a dish having an open end, said coil being located within said second casing, the open end of said first casing being opposite the open end of said second casing.

9. A vibrating sound generating device according to claim 8, wherein the first housing and/or the second housing is/are of magnetically conductive material.

10. A vibration sound-producing device according to claim 9, wherein a hollowed-out structure is formed in a portion of the second casing corresponding to the hollow region of the coil.

11. An electronic product, comprising:

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

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.