WO2020135281A1

WO2020135281A1 - Screen vibration sound production apparatus and electronic product

Info

Publication number: WO2020135281A1
Application number: PCT/CN2019/127238
Authority: WO
Inventors: 朱跃光; 刘春发; 毛东升; 史德璋
Original assignee: 歌尔股份有限公司
Priority date: 2018-12-24
Filing date: 2019-12-21
Publication date: 2020-07-02
Also published as: CN109842701A; CN109842701B

Abstract

Disclosed are a screen vibration sound production apparatus and an electronic product. The screen vibration sound production apparatus comprises: a vibration assembly, the vibration assembly comprising a screen and a fixed piece, the screen being configured to vibrate with respect to the fixed piece; a drive assembly, the drive assembly comprising at least one coil, at least one magnet, a protective casing and an elastic piece, the coil being fixedly connected to one of the screen and the fixed piece, the magnet being fixed within the protective casing, the protective casing being fixedly connected to the one of the screen and the fixed piece not fixedly connected to the coil, the elastic piece being connected between the protective casing and the vibration assembly where the coil is fixed. The coil is in a vertical posture with respect to the screen, the protective casing is provided with an opening, the coil extends into the protective casing from the opening, the magnet is located at one side of the coil, a wiring area passes through a magnetic field generated by the magnet, the coil is configured to pass an alternating current signal, the electrified wiring area passes through the magnetic field generated by the magnet, and an ampere force perpendicular to a surface of the screen is generated between the coil and the magnet. The vibration assembly is subject to the alternating ampere force transmitted by the drive assembly, so that the screen vibrates with respect to the fixed piece and produces sound. The elastic piece is configured to provide a cushioning and resetting force between the protective casing and the vibration assembly where the coil is fixed.

Description

Screen vibration sounding device and electronic product

Technical field

The technical field of electronic products of the present invention, in particular, relates to a screen vibration sound generating device and electronic products.

Background technique

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

The principle used by the conventional sound-generating device for the handset of the mobile phone is that the diaphragm pushes the air to vibrate and sound. Recently, as the full screen has become the main development direction of mobile phones, how to realize the earpiece function under the design of the screen without openings, and at the same time have a better listening experience, is currently a technical challenge. In this regard, those skilled in the art have developed a technical solution that uses screen vibration and sound.

A technical solution adopted by a person skilled in the art is shown in FIG. 1. The technical solution adopts a structure distribution manner in which an electromagnet 02 and a magnet 03 are placed relatively, by opening and closing the electromagnet 02, or switching the magnetic poles of the electromagnet 02 , So that the electromagnet 02 and the magnet 03 will have varying adsorption and repulsion effects. Then, the magnet 03 is fixed on the mobile phone screen 01, and the electromagnet 02 is fixed on the stationary parts of the mobile phone, so that the mobile phone screen 01 can be vibrated.

In this technical solution, it is assumed that the displacement in the vertical direction is x, there is an attractive force 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: because the current increases the suction in the same magnetic field, the two magnet There will be a tendency to approach each other, and at the same time the screen will have a reverse restoring force, and a damping force during the movement, so the equation of motion is:

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

However, this technical solution also has the problem of taking up more space, which is not conducive to the thin and thin structure design of the mobile phone. In order to make the mobile phone screen 01 generate a sufficiently large amplitude, enough space needs to be left between the two magnets, otherwise it will cause a collision between the magnet and the electromagnet 02, which seriously affects the acoustic performance of the screen sound. For this reason, it will inevitably occupy more space in the thickness direction of the mobile phone. Moreover, the direction of the mutually attracting and repelling force between the magnets is affected by the axial direction of the coil and the magnetic pole direction of the magnet. Even a slight deviation of the magnetic pole will cause the two magnets to receive forces that are not perpendicular to the screen , Which in turn makes the screen vulnerable to vibration.

Summary of the invention

An object of the present invention is to provide a new technical solution for screen vibration and sound.

According to a first aspect of the present invention, there is provided a screen vibration sound generating device, including:

A vibration component, the vibration component includes a screen and a fixing member, the screen is configured to be able to vibrate relative to the fixing member;

A driving component, the driving component includes at least one coil, at least one magnet, a protective shell, and an elastic sheet. The coil has a through hole in the middle, and around the through hole is a routing area of the coil, the coil and the screen or One of the fixing pieces is fixedly connected, the magnet is fixed in the protective shell, the protective shell is fixedly connected to one of the screen and the fixing piece that is not fixedly connected to the coil, and the elastic piece is connected to the protection Between the vibration component to which the shell and the coil are fixed;

The coil is in a vertical posture with respect to the screen, the protective case has a through hole, the coil extends into the protective case from the through hole, and the magnet is located on one side of the coil, so The ring-shaped end face of the coil faces the magnet, the trace area passes through the magnetic field generated by the magnet, the coil is configured to pass an alternating current signal, and the trace area energized passes through the The magnetic field generated by the magnet generates an ampere force between the coil and the magnet in a direction perpendicular to the surface of the screen;

The alternating current signal passed into the coil alternately reverses the direction of the ampere force, and the vibration component is subjected to the alternating ampere force transmitted by the drive component to make the screen relative to the The fixing member vibrates and sounds, and the elastic piece is configured to provide a buffering and resetting force between the protective shell and the vibration assembly to which the coil is fixed.

Optionally, the driving assembly is configured to provide two magnets corresponding to one coil, two magnets are respectively located in the protective shell at positions on both sides of the port, and the coils are located in two magnets Between the magnets, the two ring-shaped end faces of the coil respectively face the two magnets, and a magnetic field is formed between the two magnets.

Optionally, the magnetic pole direction of one of the magnets is: the N pole is close to the screen, and the S pole is far from the screen;

Another magnetic pole direction of the magnet is: N pole is far from the screen, S pole is close to the screen;

The routing area includes a first routing area close to the screen and a second routing area away from the screen. The routing directions of the first routing area and the second routing area are parallel to the Describe the surface of the screen;

A magnetic field is formed between the magnetic poles of the two magnets close to the screen, and the first routing area passes through the magnetic field; a magnetic field is formed between the magnetic poles of the two magnets far away from the screen, and the second The trace area passes through this magnetic field.

Optionally, the magnet is a Halbach magnet, and the side of the magnet near the coil corresponds to the side where the magnetic field of the Halbach magnet is enhanced.

Optionally, the shrapnel includes a fixed plate and at least two cantilevers. The fixed plate is fixed to one of the components of the vibration assembly. The cantilever extends from the fixed plate. One end of the fixing plate is connected to the outer surface of the protective shell.

Optionally, the fixing plate is attached to the inner surface of the screen, and four of the cantilever arms extend from the fixing plate, and the ends of the four cantilever arms are connected to the orientation of the fixing shell Described on the surface of the screen.

Optionally, the driving assembly includes a circuit board, the circuit board is attached to a surface of the fixed board facing away from the screen, and the coil is disposed on the circuit board and electrically connected to the circuit board connection.

Optionally, the protective shell is connected to the fixing piece, the fixing piece is provided with an opening, the protective shell is placed in the opening, and a bracket is fixedly connected to the side wall of the protective shell. The bracket extends from the opening to a surface of the fixing member facing away from or toward the screen, and the bracket is fixedly connected to the fixing member.

According to another aspect of the present invention, an electronic product is also provided, including:

The above screen vibration sound device;

For the product body, the screen is provided on the product body, the fixing member is a part of the structure of the product body, and the driving assembly is provided in the product body.

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

According to one embodiment of the present disclosure, the risk of screen damage can be reduced.

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

BRIEF DESCRIPTION

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

FIG. 1 is a schematic side sectional view of a screen sounding technical solution in the prior art;

2 is an exploded view of the driving assembly of the screen vibration sounding device provided by the present invention;

3 is a schematic side sectional view of a screen vibration sound-generating device provided by the present invention;

4 is a schematic side sectional view of another screen vibration sound-generating device provided by the present invention;

5 is a schematic side sectional view of another screen vibration sound-generating device provided by the present invention;

6 is a schematic side cross-sectional view of another screen vibration sound-generating device provided by the present invention.

detailed description

Various exemplary embodiments of the present invention will now be described in detail with reference to the drawings. It should be noted that the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

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

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

In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiment may have different values.

It should be noted that similar reference numerals and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, there is no need to discuss it further in subsequent drawings.

The invention provides a screen vibration sound-generating device, which includes a vibration component and a driving component. As shown in FIGS. 2 and 3, the vibration assembly includes a screen 11 and a fixing member 12. The screen 11 is configured to vibrate relative to the fixing member 12. The fixing member 12 may be a certain fixing member in the electronic device to which the sound-emitting device is applied, or may be a separately arranged fixed part. The driving assembly includes at least one coil 21, at least one magnet 22, a protective shell 23, and an elastic sheet 24. The coil 21 is wound by a wire in one direction to form a closed ring structure. The center of the coil 21 has a through hole, and the periphery of the through hole is a routing area of the coil 21. The wiring area refers to an area where the leads in the coil 21 actually pass, and the entire wiring area is in a ring shape. The coil 21 is fixed on one of the screen 11 or the fixing member 12, and the magnet 22 is fixedly arranged in the protective shell 23. The protective case 23 is fixed to the screen 11 or the fixing member 12 where the coil 21 is not provided. In the embodiment shown in FIGS. 2 and 3, the coil 21 forms a fixed connection with the screen 11, and the protective shell 23 and the magnet 22 form a fixed connection with the fixing member 12. In other embodiments, the protective case may form a fixed connection with the screen, and the coil may form a fixed connection with the fixing member.

The elastic piece 24 is connected between the protective shell 23 and the part of the vibration assembly to which the coil 21 is fixed. Taking the embodiment shown in FIG. 3 as an example, the elastic sheet 24 is connected between the screen 11 and the protective shell 23. In other embodiments, the elastic sheet may be connected between the fixing member and the protective shell. The shrapnel can provide a buffering effect between the protective shell and the components of another vibration assembly, and can also provide a resetting force for the resetting after the screen vibrates. Reduce the risk of screen damage and incorrect reset of the screen.

The coil 21 in a closed ring shape has an axis. In the embodiment of the present invention, the axis of the coil 21 is parallel to the surface of the screen 11. As shown in FIG. 3, the coil 21 is opposite to the screen 11 Take a vertical posture. The protective shell 23 has a through port 231 from which the coil 21 can extend into the associated protective shell 23. Therefore, the magnet 22 is located on the side of the coil 21, the annular end surface of the coil 21 faces the magnet 22, and the axis of the coil 21 and the surface of the screen 11 are in a horizontal posture. The routing area of the coil 21 includes a first routing area 211 close to the screen, and a second routing area 212 away from the screen. The routing directions of the first routing area 211 and the second routing area 212 are parallel to the surface of the screen, and in the embodiment shown in FIGS. 3 and 4, routing is inward and outward along the paper surface form. The magnet 22 can generate a magnetic field, and at least one of the first routing area 211 and the second routing area 212 is to pass through the magnetic field generated by the magnet 22. In this way, when an alternating current signal is passed into the coil 21, an ampere force can be generated between the coil 21 and the magnet 22. The energized trace area passes through the magnetic field and can generate ampere force. Since the magnet 22 is disposed on the side of the coil 21, a part of the magnetic field generated by the magnet 22 can pass through the coil 21 in a direction parallel to the surface of the screen 11, thereby generating an ampere force in a direction perpendicular to the surface of the screen 11.

Since the coil and the magnet are respectively arranged on the screen and the fixing member, and the current signal passing through the coil is an alternating signal, the direction of the generated ampere force also changes alternately and inversely. Ampere force can be directly transmitted to the screen through the driving component. As shown in FIG. 3, the coil 21 can directly drive the screen 11 after receiving the ampere force. The above-mentioned ampere force will cause a relative displacement between the screen and the fixing member, thereby causing the screen to vibrate and sound relative to the fixing portion.

Compared with the prior art, the screen vibration sound-generating device provided by the present invention can directly drive the screen vibration, on the other hand, it can better protect the screen and reduce the risk of screen damage. Taking the embodiment shown in FIG. 3 as an example, the coil 21 and the magnet 22 are directly disposed on the screen 11 and the fixing member 12, respectively, and directly drive the screen 11 to ensure efficient vibration transmission efficiency. The direct driving method of directly connecting the driving component and the vibration component simplifies the principle of driving the screen to vibrate, and the screen can directly generate vibration after being subjected to ampere force. This design method effectively improves the vibration conversion efficiency, without the need to cause resonance through the vibration of the vibrator to drive the screen vibration. This design makes the amplitude that the screen can produce basically the same as the amplitude that the driving component can produce. The space reserved for the driving component can be designed according to the performance requirements for the screen amplitude. There is no need to reserve a vibration space for the drive assembly that is significantly greater than the maximum amplitude of the screen. On the other hand, the shrapnel 24 is connected between the protective shell 23 and the screen. When the magnet 22 interacts with the coil 21 to drive the screen 11 to vibrate, the shrapnel 24 can generate a damping and buffering effect to buffer the impact force received by the screen 1, thereby Prevent the screen from being damaged by frequently changing amperage. Moreover, in the case where the screen is made of a material that is softer, has better deformability, but has relatively poor elastic recovery ability, the elastic sheet can provide a return force to the screen, so that the screen recovers after each vibration action To the initial equilibrium position. In this way, both the life of the screen and the acoustic performance of the sound-generating device can be improved.

Preferably, the driving assembly is configured to provide two magnets 22 corresponding to one coil 21, as shown in FIGS. 3 and 4. The two magnets 22 are located on both sides of the coil 21 along the axial direction of the coil 21, the coil 21 is sandwiched between the two magnets 22, and the two annular end surfaces of the coil 21 are respectively Oriented two pieces of magnet 22. A magnetic field is formed between the two magnets 22, and the first wiring area 211 and the second wiring area 212 of the coil 21 can pass through the magnetic field, thereby generating an ampere force between the magnet 22 and the coil 21. The stability, symmetry, and strength of the magnetic field generated by the two magnets make the ampere force between the coil and the magnet stronger, and the direction of the ampere force is less prone to tilt, which makes the vibration effect of the screen more stable. Moreover, by providing two magnets, the magnetic field formed between the two magnets is more concentrated and stronger than the magnetic field formed by one magnet on the side close to the coil, and the magnetic field generated by the magnet is effectively utilized.

In the embodiment shown in FIGS. 3 and 4, the portion that can cause the coil 21 to generate an ampere force that moves upward or downward is the upper and lower two-stage wiring area of the coil 21. Therefore, in order to improve the utilization rate of the magnetic field, the magnetic field should be passed through the above-mentioned two-stage wiring area as much as possible.

As shown in FIG. 3, the present invention provides a preferred implementation of magnetic circuit distribution when two magnets 22 are used. For the magnet on the left, its N pole is far away from the screen 11, that is, the N pole faces upward; its S pole is close to the screen 11, that is, the S level faces downward. For the magnet on the right, its N pole is close to the screen 11, that is, the N pole faces downward; its S pole is far from the screen 11, that is, the S pole faces upward. In this configuration of magnets, a magnetic field can be formed between the magnetic poles of the two magnets 22 near the screen 11, for example, the magnetic field extending from the N pole in the lower right to the S pole in the lower left, the first routing area 211 passes through this magnetic field. A magnetic field can be formed between the magnetic poles of the two magnets 22 away from the screen 11, for example, the magnetic field extending from the N pole at the upper left to the S pole at the upper right, and the second trace area 212 passes through the magnetic field. In this way, a magnetic field is passed through the two sections of the routing area on the coil 21 that can effectively generate the ampere force for vibration, and the direction of the magnetic field is substantially perpendicular to the direction of the current in the coil 21, which is more efficiently converted into the ampere force. Further, the direction of the magnetic field passing through the two upper and lower wiring regions is opposite, and the current directions in the upper and lower two wiring regions are also opposite, thereby making the direction of the ampere force generated by the upper and lower two wiring regions the same, which significantly improves The magnitude of the ampere force generated between the coil and the magnet. This design method can significantly improve the amplitude and sensitivity of screen vibration.

For an embodiment where only one magnet is used in conjunction with the coil to generate ampere force, the magnetic pole distribution direction of the magnet is preferably such that one of the magnetic poles is close to the screen and the other magnetic pole is far from the screen. In this way, it is also possible to reverse the direction of the magnetic field passing through the two upper and lower wiring areas, improve the utilization of the wiring area of the coil, and increase the generated ampere force.

The present invention does not exclude the embodiment in which the magnetic pole of the magnet is arranged toward the coil. Orienting the magnetic poles of the magnet toward the coil and aligning with one of the upper and lower wiring areas of the coil can also generate an appropriate ampere force between the coil and the magnet to drive vibration.

Taking the embodiment shown in FIGS. 3 and 4 as an example, when the screen 11 is at a stationary position relative to the fixing member 12, the first routing area 211 of the coil 21 is in a direction perpendicular to the surface of the screen 11 The position corresponds to the position of the two magnets 22 near the magnetic pole of the screen 11. Correspondingly, the position of the second wiring area 212 in this direction corresponds to the positions of the two magnets away from the magnetic poles of the screen 11. In this way, the above two wiring regions respectively pass through the magnetic field parallel to the screen surface formed between the two pairs of magnetic poles of the two magnets.

After the current signal is passed into the coil 21, for example, the direction of the first signal passed in the first routing area 211 is from inside to outside of the paper, and the direction in the second routing area 212 is due to The paper surface is outward to the paper surface. This signal direction characteristic is due to the fact that the coil is formed by winding the wire in one direction. At this time, the magnetic fields of the two magnets 22 near the screen 11 propagate from the right N pole to the left S pole, and a downward ampere force is generated according to the left-hand rule of the ampere force. The magnetic fields of the two magnets 22 away from the screen 11 propagate from the N pole on the left to the S pole on the right, and a downward ampere force is generated according to the left-hand rule of the ampere force. After receiving the ampere force, the coil 21 directly pushes the screen 11 downward.

Due to the alternating signal passing in the coil, the signal reverses afterwards. The direction of the signal in the first routing area 211 is from the outside of the paper to the inside of the paper, and the direction in the second routing area 212 is The paper surface is inward to the paper surface. According to the left-right rule of ampere force, the two routing areas generate upward ampere force. After receiving the ampere force, the coil 21 directly pulls the screen to move upward.

Through the above principle, the driving component realizes the effect of directly driving the screen vibration.

The present invention provides three specific connection forms between the protective shell and the fixing member, as shown in Figure 3-5. The fixing member 12 may be a plate-like structure having an opening 121. In the embodiment shown in FIG. 3, the opening 121 is provided for the protective shell 23 to be disposed therein, and the protective shell 23 is fixed on the inner side wall of the opening 121. The advantage of this design scheme is that the protective shell and the magnet itself occupy less space in the direction of screen vibration, and the thickness of the protective shell and the magnet itself partially overlaps the fixing member, which is more in line with the thinning of electronic products such as mobile phones design.

As shown in FIG. 4, the fixing member 12 may be a plate-shaped structure or an inner surface of a casing of an electronic product, and the protective shell 23 is directly fixed on the lower surface of the fixing member 12. The fixing member 12 still has an opening 121, and the opening 231 on the protective shell 23 penetrates from the lower wall to the upper wall of the protective shell 23. The coil 21 may extend from the lower opening of the protective case 23 and extend from the upper opening. Further, a small part of the structure of the coil 21 can extend into the opening 121 of the fixing member 12. The advantage of this design solution is that the connection between the protective shell and the fixing member is more reliable, and the magnet is not prone to swaying or loosening, which enables Ampere to drive the screen vibration more efficiently. Moreover, by providing the opening 121 in the fixing member 12, the space occupied by the driving assembly in the vibration direction parallel to the screen is reduced as much as possible.

As shown in FIG. 5, the driving assembly further includes a bracket 26, and the bracket 26 is used to fix the protective shell 24 on the fixing member 12. The fixing member is provided with an opening 121, and the protective shell 24 is placed in the opening 121. The side wall of the protective case 24 does not take the form directly connected to the inner side wall of the opening 121 as shown in FIG. 3. The bracket 26 is fixedly connected to the side wall of the protective shell 24. The bracket 26 extends from the opening 121 to a surface of the fixing member 12 facing away from or facing the screen 11. In the embodiment shown in FIG. 5, the bracket 26 extends to the surface of the fixing member 12 facing away from the screen 11 and is fixedly connected to the surface. Thus, the protective shell 24 is fixedly connected in the opening 121 by the bracket 26. The advantage of this embodiment is that, on the one hand, the space occupied by the protective shell in the direction parallel to the vibration of the screen can be reduced, and on the other hand, the assembly process of the protective shell and the fixing member can be simplified. There is a large contact area between the bracket and the fixing member, and the contact surface faces or faces away from the screen, making it easier to achieve a fixed connection. For example, using adhesive or screw connection, riveting. The difficulty of the fixed connection is significantly reduced compared to the fixed connection between the side wall of the protective shell and the side wall of the opening. The bracket can also be fixedly connected to the protective shell by means of adhesive bonding, screw connection and riveting. Alternatively, the cross section of the bracket 26 may be L-shaped.

Preferably, as shown in FIG. 6, the magnet 22 uses a Halbach magnet. The Halbach magnet has the characteristics of strengthening the magnetic field on one side and weakening the magnetic field on the other side. In the embodiment of the present invention, the side where the magnet 22 is close to the coil 21 corresponds to the side where the magnetic field of the Halbach magnet is enhanced. The effect of strengthening the magnetic field by the Halbach magnet is obvious, and the magnetic field can radiate outward in a direction close to the side wall of the magnet 22 near the Halbach magnet. Depending on the degree of magnetization of the magnets used, even the strength of the magnetic field and the utilization rate of the magnetic field can exceed that of the embodiments where magnets are provided on both sides of the coil. Even if the Halbach magnet is provided on only one side of the coil, a strong ampere force can be generated between the coil and the magnet. As shown in FIG. 6, it is preferable to use a Halbach magnet on both sides of the coil 22.

The invention provides a magnetic pole distribution method of the Halbach magnet. As shown in FIG. 6, the Halbach magnet includes three magnets, and the three magnets are stacked and placed in order from top to bottom. The magnetic poles of the two magnets in the top layer and the bottom layer face the side of the Halbach magnet, that is, toward or away from the coil 21, and the magnetic poles of the magnet in the middle layer face the upper and lower magnets. On the side near the coil 21, that is, on the side where the magnetic field of the Halbach magnet is strengthened, the magnetic pole of the upper magnet close to the coil 21 and the middle magnet are close to the magnetic pole of the upper magnet, and the lower magnet is close to the magnetic pole of the coil 21 The magnetic pole close to the middle magnet is very homogenous. In the embodiment shown in FIG. 6, taking the magnet on the left as an example, the right side of the upper magnet is the N pole, and the N pole of the middle magnet is closely attached to the lower surface of the upper magnet; the right side of the lower magnet is the S pole, The S pole of the middle magnet is closely attached to the upper surface of the lower magnet. In this way, a strengthened magnetic field is formed on the right side of the Halbach magnet. The magnetic flux radiated from the N pole of the upper magnet is repulsed by the N pole of the middle magnet and can only radiate to the right. Further, the S pole of the lower magnet receives the magnetic induction line emitted from the N pole. Since the S pole is repulsed by the S pole of the middle magnet, the magnetic induction line can only be transmitted back vertically from the right side of the lower magnet and concentrated to the lower magnet S pole. Under the action of this combined magnet, the magnetic induction lines on the right side of the magnet 22 are more concentrated, and the direction is substantially perpendicular to the side wall of the magnet 22, that is, perpendicular to the routing area of the coil 21. This embodiment can significantly enhance the ampere force generated between the magnet 22 and the coil 21.

Preferably, at least one of the first routing area and the second routing area is facing the magnetic pole on the side where the magnetic field of the Halbach magnet is enhanced. Through this design, the utilization rate of the magnetic field is further improved. As shown in FIG. 7, the second trace area 212 of the coil 21 corresponds to the position of the N pole of the upper magnet, and the first trace area 211 of the coil 21 corresponds to the position of the S pole of the lower magnet. The wiring area of the coil 21 corresponds exactly to the position of the magnetic pole, which can improve the utilization rate of the magnetic field.

The invention provides an embodiment of the preferred structure of the shrapnel. As shown in FIG. 2, the elastic sheet 24 may include a fixing plate 241 and at least two cantilevers 242. The fixing plate 241 is fixed to one of the components in the vibration assembly, and the cantilever 242 extends from the fixing plate 241. The end of the cantilever 242 away from the fixing plate 241 is connected to the outer surface of the protective shell 23 on. In the embodiment shown in FIG. 3, the fixing plate 241 is fixedly covered on the inner surface of the screen 11. The cantilever 242 extends from the fixing plate 241 and is connected upward on the lower surface of the protective shell 24. In another embodiment, the fixing plate can also be fixed on the fixing member, and the end of the cantilever is connected to the inner surface of the screen, which can also play the role of buffering and providing restoring force.

Preferably, as shown in FIG. 2, four cantilevers extend from the fixing plate, and the ends of the four cantilevers are all connected to the surface of the fixing shell facing the screen. The supporting force provided by the four cantilevers is more balanced and balanced, so that the screen can be subjected to a more stable and balanced buffering effect. Further reduce the possibility of polarization and other phenomena.

Optionally, the screen-driven sound generating device may include at least two sets of driving components. Corresponding to a set of vibration components, at least two sets of drive components can be configured at different positions on the screen. This embodiment makes the amp force generated between the screen and the fixture more balanced, and the screen generates vibration and vibration under the effect of uniform amp force The stability is better, the screen is not easy to damage, and the acoustic performance is better.

Optionally, as shown in FIGS. 2 and 3, the driving assembly further includes a circuit board 25. The circuit board 25 is electrically connected to the coil 21 and is used to transmit electrical signals so that an ampere force can be formed between the coil 21 and the magnet 22. The circuit board 25 is preferably provided on the same component of the vibration assembly as the coil 21. As shown in FIGS. 2 and 3, the circuit board 25 is attached to the fixing plate 241 of the elastic sheet 24. The coil 21 is also fixedly connected to the fixing plate 241. In other embodiments, the circuit board may also be attached to the inner surface of the screen.

The invention also provides an electronic product. The electronic product includes the above-mentioned screen vibration sounding device and product main body. The electronic product may be a mobile phone or a tablet computer, etc. The present invention does not limit this. The screen is set on the product body and serves as a display screen of electronic products. The screen may be provided in a form where one end is rotatably connected to the main body of the product and the other end is freely movable; or, the screen may be made of a material with good elastic deformation ability, and the screen is fixedly connected to other fixed parts with one end The upper and the other end can be set in a freely movable form. In this way, the screen can generate vibrations relative to the product body. A part of the structure of the product body may serve as the fixing member, and the driving assembly is disposed in the product body. For example, the protective shell and the magnet are fixedly arranged on a part of the product body equivalent to the fixing member, and the coil is fixedly arranged on the screen. The shrapnel is connected between the fixed shell and the screen. The amp force generated by the drive assembly can drive the screen to vibrate and sound. Since the electronic product provided by the present invention adopts the screen vibration sound-generating device provided by the present invention, it takes up less space in the direction parallel to the thickness of the screen of the electronic product, which is more conducive to designing the electronic product thinner and satisfying the electronic product Thin and light design requirements.

Preferably, the fixing part may be a structure such as a middle frame or a side wall in the product body. In the product body, in order to place other electronic devices, the product body is often equipped with structural components such as partitions, middle frames, etc. These structural components have good structural stability in electronic products. On the one hand, they are used for electronic devices in the case, on the other hand Used to protect electronic devices. Therefore, using such structural members in the product body as the fixing portion can improve the conversion rate of the ampere force into vibration, and improve the vibration reliability. The inner surface of the side wall of the product body may also serve as the fixing portion.

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, 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 screen vibration sounding device, characterized in that it includes:

A vibration component, the vibration component includes a screen and a fixing member, the screen is configured to be able to vibrate relative to the fixing member;

A driving component, the driving component includes at least one coil, at least one magnet, a protective shell, and an elastic sheet. The coil has a through hole in the middle, and around the through hole is a routing area of the coil, the coil and the screen or One of the fixing pieces is fixedly connected, the magnet is fixed in the protective shell, the protective shell is fixedly connected to one of the screen and the fixing piece that is not fixedly connected to the coil, and the elastic piece is connected to the protection Between the vibration component to which the shell and the coil are fixed;

The coil is in a vertical posture with respect to the screen, the protective case has a through hole, the coil extends into the protective case from the through hole, and the magnet is located on one side of the coil, so The ring-shaped end face of the coil faces the magnet, the trace area passes through the magnetic field generated by the magnet, the coil is configured to pass an alternating current signal, and the trace area energized passes through the The magnetic field generated by the magnet generates an ampere force between the coil and the magnet in a direction perpendicular to the surface of the screen;

The alternating current signal passed into the coil alternately reverses the direction of the ampere force, and the vibration component is subjected to the alternating ampere force transmitted by the drive component to make the screen relative to the The fixing member vibrates and sounds, and the elastic piece is configured to provide a buffering and resetting force between the protective shell and the vibration assembly to which the coil is fixed.
The screen vibration sound-generating device according to claim 1, wherein the driving assembly is configured to provide two pieces of the magnet corresponding to one coil, and the two pieces of the magnet are respectively located in the protective shell at the through opening At positions on both sides, the coil is located between the two magnets, the two ring-shaped end faces of the coil are respectively facing the two magnets, and a magnetic field is formed between the two magnets.
The screen vibration sound-generating device according to claim 2, wherein the magnetic pole direction of one of the magnets is: the N pole is close to the screen, and the S pole is far from the screen;

Another magnetic pole direction of the magnet is: N pole is far from the screen, S pole is close to the screen;

The routing area includes a first routing area close to the screen and a second routing area away from the screen. The routing directions of the first routing area and the second routing area are parallel to the Describe the surface of the screen;

A magnetic field is formed between the magnetic poles of the two magnets close to the screen, and the first routing area passes through the magnetic field; a magnetic field is formed between the magnetic poles of the two magnets far away from the screen, and the second The trace area passes through this magnetic field.
The screen vibration sound-generating device according to claim 1, wherein the magnet is a Halbach magnet, and the side of the magnet near the coil corresponds to the side where the magnetic field of the Halbach magnet is enhanced.
The screen vibration sound-generating device according to claim 1, wherein the elastic plate comprises a fixing plate and at least two cantilever arms, the fixing plate is fixed on one of the components of the vibration assembly, and the cantilever arm The fixing plate extends, and the end of the cantilever remote from the fixing plate is connected to the outer surface of the protective shell.
The screen vibration sound-generating device according to claim 5, wherein the fixing plate is attached to the inner surface of the screen, and four of the cantilever arms and four of the cantilever arms extend from the fixing plate Is connected to the surface of the fixed shell facing the screen.
The screen vibration sound-generating device according to claim 5, characterized in that the driving assembly comprises a circuit board, the circuit board is attached to a surface of the fixing plate facing away from the screen, and the coil is provided at The circuit board is electrically connected to the circuit board.
The screen vibration sound-generating device according to claim 1, wherein the protective shell is connected to the fixing member, the fixing member is provided with an opening, the protective shell is placed in the opening, the A bracket is fixedly connected to the side wall of the protective shell, and the bracket extends from the opening to a surface of the fixing member facing away from or toward the screen, and the bracket is fixedly connected to the fixing member.
An electronic product, characterized in that it includes:

The screen vibration sound generating device according to any one of claims 1-7;

For the product body, the screen is provided on the product body, the fixing member is a part of the structure of the product body, and the driving assembly is provided in the product body.
The electronic product according to claim 9, wherein the fixing portion is a middle frame or a side wall in the product body.